Add note about Fedora packaging Rust libraries

See https://github.com/element-hq/synapse/pull/18856#discussion_r2330378204

.ci/scripts/test_synapse_port_db.sh

@@ -61,7 +61,7 @@ poetry run update_synapse_database --database-config .ci/postgres-config-unporte
 echo "+++ Comparing ported schema with unported schema"
 # Ignore the tables that portdb creates. (Should it tidy them up when the porting is completed?)
 psql synapse -c "DROP TABLE port_from_sqlite3;"
-pg_dump --format=plain --schema-only --no-tablespaces --no-acl --no-owner synapse_unported > unported.sql
-pg_dump --format=plain --schema-only --no-tablespaces --no-acl --no-owner synapse          >   ported.sql
+pg_dump --format=plain --schema-only --no-tablespaces --no-acl --no-owner --restrict-key=TESTING synapse_unported > unported.sql
+pg_dump --format=plain --schema-only --no-tablespaces --no-acl --no-owner --restrict-key=TESTING synapse          >   ported.sql
 # By default, `diff` returns zero if there are no changes and nonzero otherwise
-diff -u unported.sql ported.sql | tee schema_diff
+diff -u unported.sql ported.sql | tee schema_diff

.github/workflows/docker.yml

@@ -31,7 +31,7 @@ jobs:
         uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 # v3.11.1
 
       - name: Checkout repository
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
 
       - name: Extract version from pyproject.toml
         # Note: explicitly requesting bash will mean bash is invoked with `-eo pipefail`, see
@@ -95,7 +95,7 @@ jobs:
       - build
     steps:
       - name: Download digests
-        uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4.3.0
+        uses: actions/download-artifact@634f93cb2916e3fdff6788551b99b062d0335ce0 # v5.0.0
         with:
           path: ${{ runner.temp }}/digests
           pattern: digests-*
@@ -120,10 +120,10 @@ jobs:
         uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 # v3.11.1
 
       - name: Install Cosign
-        uses: sigstore/cosign-installer@398d4b0eeef1380460a10c8013a76f728fb906ac # v3.9.1
+        uses: sigstore/cosign-installer@d58896d6a1865668819e1d91763c7751a165e159 # v3.9.2
 
       - name: Calculate docker image tag
-        uses: docker/metadata-action@902fa8ec7d6ecbf8d84d538b9b233a880e428804 # v5.7.0
+        uses: docker/metadata-action@c1e51972afc2121e065aed6d45c65596fe445f3f # v5.8.0
         with:
           images: ${{ matrix.repository }}
           flavor: |

.github/workflows/docs-pr.yaml

@@ -13,7 +13,7 @@ jobs:
     name: GitHub Pages
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
         with:
           # Fetch all history so that the schema_versions script works.
           fetch-depth: 0
@@ -50,7 +50,7 @@ jobs:
     name: Check links in documentation
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
 
       - name: Setup mdbook
         uses: peaceiris/actions-mdbook@ee69d230fe19748b7abf22df32acaa93833fad08 # v2.0.0

.github/workflows/docs.yaml

@@ -50,7 +50,7 @@ jobs:
     needs:
       - pre
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
         with:
           # Fetch all history so that the schema_versions script works.
           fetch-depth: 0

.github/workflows/fix_lint.yaml

@@ -18,7 +18,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
 
       - name: Install Rust
         uses: dtolnay/rust-toolchain@b3b07ba8b418998c39fb20f53e8b695cdcc8de1b # master

.github/workflows/latest_deps.yml

@@ -42,7 +42,7 @@ jobs:
     if: needs.check_repo.outputs.should_run_workflow == 'true'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
       - name: Install Rust
         uses: dtolnay/rust-toolchain@b3b07ba8b418998c39fb20f53e8b695cdcc8de1b # master
         with:
@@ -60,7 +60,7 @@ jobs:
       - run: poetry run pip list > before.txt
       # Upgrade all runtime dependencies only. This is intended to mimic a fresh
       # `pip install matrix-synapse[all]` as closely as possible.
-      - run: poetry update --no-dev
+      - run: poetry update --without dev
       - run: poetry run pip list > after.txt && (diff -u before.txt after.txt || true)
       - name: Remove unhelpful options from mypy config
         run: sed -e '/warn_unused_ignores = True/d' -e '/warn_redundant_casts = True/d' -i mypy.ini
@@ -77,7 +77,7 @@ jobs:
             postgres-version: "14"
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
 
       - name: Install Rust
         uses: dtolnay/rust-toolchain@b3b07ba8b418998c39fb20f53e8b695cdcc8de1b # master
@@ -152,7 +152,7 @@ jobs:
       BLACKLIST: ${{ matrix.workers && 'synapse-blacklist-with-workers' }}
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
 
       - name: Install Rust
         uses: dtolnay/rust-toolchain@b3b07ba8b418998c39fb20f53e8b695cdcc8de1b # master
@@ -202,7 +202,7 @@ jobs:
 
     steps:
       - name: Check out synapse codebase
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
         with:
           path: synapse
 
@@ -234,7 +234,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
       - uses: JasonEtco/create-an-issue@1b14a70e4d8dc185e5cc76d3bec9eab20257b2c5 # v2.9.2
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/poetry_lockfile.yaml

@@ -16,7 +16,7 @@ jobs:
     name: "Check locked dependencies have sdists"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
       - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
         with:
           python-version: '3.x'

.github/workflows/push_complement_image.yml

@@ -33,17 +33,17 @@ jobs:
       packages: write
     steps:
       - name: Checkout specific branch (debug build)
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
         if: github.event_name == 'workflow_dispatch'
         with:
           ref: ${{ inputs.branch }}
       - name: Checkout clean copy of develop (scheduled build)
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
         if: github.event_name == 'schedule'
         with:
           ref: develop
       - name: Checkout clean copy of master (on-push)
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
         if: github.event_name == 'push'
         with:
           ref: master
@@ -55,7 +55,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
       - name: Work out labels for complement image
         id: meta
-        uses: docker/metadata-action@902fa8ec7d6ecbf8d84d538b9b233a880e428804 # v5.7.0
+        uses: docker/metadata-action@c1e51972afc2121e065aed6d45c65596fe445f3f # v5.8.0
         with:
           images: ghcr.io/${{ github.repository }}/complement-synapse
           tags: |

.github/workflows/release-artifacts.yml

@@ -27,7 +27,7 @@ jobs:
     name: "Calculate list of debian distros"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
       - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
         with:
           python-version: "3.x"
@@ -55,7 +55,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
         with:
           path: src
 
@@ -66,7 +66,7 @@ jobs:
           install: true
 
       - name: Set up docker layer caching
-        uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
+        uses: actions/cache@0400d5f644dc74513175e3cd8d07132dd4860809 # v4.2.4
         with:
           path: /tmp/.buildx-cache
           key: ${{ runner.os }}-buildx-${{ github.sha }}
@@ -132,7 +132,7 @@ jobs:
             os: "ubuntu-24.04-arm"
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
 
       - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
         with:
@@ -165,7 +165,7 @@ jobs:
     if: ${{ !startsWith(github.ref, 'refs/pull/') }}
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
       - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
         with:
           python-version: "3.10"
@@ -191,7 +191,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Download all workflow run artifacts
-        uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4.3.0
+        uses: actions/download-artifact@634f93cb2916e3fdff6788551b99b062d0335ce0 # v5.0.0
       - name: Build a tarball for the debs
         # We need to merge all the debs uploads into one folder, then compress
         # that.

.github/workflows/schema.yaml

@@ -14,7 +14,7 @@ jobs:
     name: Ensure Synapse config schema is valid
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
       - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
         with:
           python-version: "3.x"
@@ -40,7 +40,7 @@ jobs:
     name: Ensure generated documentation is up-to-date
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
       - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
         with:
           python-version: "3.x"

.github/workflows/tests.yml

@@ -86,7 +86,7 @@ jobs:
     if: ${{ needs.changes.outputs.linting == 'true' }}
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
       - name: Install Rust
         uses: dtolnay/rust-toolchain@b3b07ba8b418998c39fb20f53e8b695cdcc8de1b # master
         with:
@@ -106,7 +106,7 @@ jobs:
     if: ${{ needs.changes.outputs.linting == 'true' }}
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
       - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
         with:
           python-version: "3.x"
@@ -116,7 +116,7 @@ jobs:
   check-lockfile:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
       - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
         with:
           python-version: "3.x"
@@ -129,7 +129,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
 
       - name: Setup Poetry
         uses: matrix-org/setup-python-poetry@5bbf6603c5c930615ec8a29f1b5d7d258d905aa4 # v2.0.0
@@ -151,7 +151,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
 
       - name: Install Rust
         uses: dtolnay/rust-toolchain@b3b07ba8b418998c39fb20f53e8b695cdcc8de1b # master
@@ -174,7 +174,7 @@ jobs:
       # Cribbed from
       # https://github.com/AustinScola/mypy-cache-github-action/blob/85ea4f2972abed39b33bd02c36e341b28ca59213/src/restore.ts#L10-L17
       - name: Restore/persist mypy's cache
-        uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
+        uses: actions/cache@0400d5f644dc74513175e3cd8d07132dd4860809 # v4.2.4
         with:
           path: |
             .mypy_cache
@@ -187,7 +187,7 @@ jobs:
   lint-crlf:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
       - name: Check line endings
         run: scripts-dev/check_line_terminators.sh
 
@@ -195,7 +195,7 @@ jobs:
     if: ${{ (github.base_ref == 'develop'  || contains(github.base_ref, 'release-')) && github.actor != 'dependabot[bot]' }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
         with:
           ref: ${{ github.event.pull_request.head.sha }}
           fetch-depth: 0
@@ -213,7 +213,7 @@ jobs:
     if: ${{ needs.changes.outputs.linting == 'true' }}
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
         with:
           ref: ${{ github.event.pull_request.head.sha }}
       - name: Install Rust
@@ -233,7 +233,7 @@ jobs:
     if: ${{ needs.changes.outputs.rust == 'true' }}
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
 
       - name: Install Rust
         uses: dtolnay/rust-toolchain@b3b07ba8b418998c39fb20f53e8b695cdcc8de1b # master
@@ -252,7 +252,7 @@ jobs:
     if: ${{ needs.changes.outputs.rust == 'true' }}
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
 
       - name: Install Rust
         uses: dtolnay/rust-toolchain@b3b07ba8b418998c39fb20f53e8b695cdcc8de1b # master
@@ -263,18 +263,56 @@ jobs:
 
       - run: cargo clippy --all-features -- -D warnings
 
+  lint-rust:
+    runs-on: ubuntu-latest
+    needs: changes
+    if: ${{ needs.changes.outputs.rust == 'true' }}
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@b3b07ba8b418998c39fb20f53e8b695cdcc8de1b # master
+        with:
+          toolchain: ${{ env.RUST_VERSION }}
+      - uses: Swatinem/rust-cache@98c8021b550208e191a6a3145459bfc9fb29c4c0 # v2.8.0
+
+      - name: Setup Poetry
+        uses: matrix-org/setup-python-poetry@5bbf6603c5c930615ec8a29f1b5d7d258d905aa4 # v2.0.0
+        with:
+          # Install like a normal project from source with all optional dependencies
+          extras: all
+          install-project: "true"
+          poetry-version: "2.1.1"
+
+      - name: Ensure `Cargo.lock` is up to date (no stray changes after install)
+        # The `::error::` syntax is using GitHub Actions' error annotations, see
+        # https://docs.github.com/en/actions/reference/workflow-commands-for-github-actions
+        run: |
+          if git diff --quiet Cargo.lock; then
+            echo "Cargo.lock is up to date"
+          else
+            echo "::error::Cargo.lock has uncommitted changes after install. Please run 'poetry install --extras all' and commit the Cargo.lock changes."
+            git diff --exit-code Cargo.lock
+            exit 1
+          fi
+
+  # This job is split from `lint-rust` because it requires a nightly Rust toolchain
+  # for some of the unstable options we use in `.rustfmt.toml`.
   lint-rustfmt:
     runs-on: ubuntu-latest
     needs: changes
     if: ${{ needs.changes.outputs.rust == 'true' }}
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
 
       - name: Install Rust
         uses: dtolnay/rust-toolchain@b3b07ba8b418998c39fb20f53e8b695cdcc8de1b # master
         with:
-          # We use nightly so that it correctly groups together imports
+          # We use nightly so that we can use some unstable options that we use in
+          # `.rustfmt.toml`.
           toolchain: nightly-2025-04-23
           components: rustfmt
       - uses: Swatinem/rust-cache@98c8021b550208e191a6a3145459bfc9fb29c4c0 # v2.8.0
@@ -288,7 +326,7 @@ jobs:
     needs: changes
     if: ${{ needs.changes.outputs.linting_readme == 'true' }}
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
       - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
         with:
           python-version: "3.x"
@@ -309,6 +347,7 @@ jobs:
       - check-lockfile
       - lint-clippy
       - lint-clippy-nightly
+      - lint-rust
       - lint-rustfmt
       - lint-readme
     runs-on: ubuntu-latest
@@ -327,6 +366,7 @@ jobs:
             lint-pydantic
             lint-clippy
             lint-clippy-nightly
+            lint-rust
             lint-rustfmt
             lint-readme
 
@@ -336,7 +376,7 @@ jobs:
     needs: linting-done
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
       - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
         with:
           python-version: "3.x"
@@ -357,7 +397,7 @@ jobs:
         job:  ${{ fromJson(needs.calculate-test-jobs.outputs.trial_test_matrix) }}
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
       - run: sudo apt-get -qq install xmlsec1
       - name: Set up PostgreSQL ${{ matrix.job.postgres-version }}
         if: ${{ matrix.job.postgres-version }}
@@ -413,7 +453,7 @@ jobs:
       - changes
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
 
       - name: Install Rust
         uses: dtolnay/rust-toolchain@b3b07ba8b418998c39fb20f53e8b695cdcc8de1b # master
@@ -478,7 +518,7 @@ jobs:
         extras: ["all"]
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
       # Install libs necessary for PyPy to build binary wheels for dependencies
       - run: sudo apt-get -qq install xmlsec1 libxml2-dev libxslt-dev
       - uses: matrix-org/setup-python-poetry@5bbf6603c5c930615ec8a29f1b5d7d258d905aa4 # v2.0.0
@@ -528,7 +568,7 @@ jobs:
         job: ${{ fromJson(needs.calculate-test-jobs.outputs.sytest_test_matrix) }}
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
       - name: Prepare test blacklist
         run: cat sytest-blacklist .ci/worker-blacklist > synapse-blacklist-with-workers
 
@@ -575,7 +615,7 @@ jobs:
           --health-retries 5
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
       - run: sudo apt-get -qq install xmlsec1 postgresql-client
       - uses: matrix-org/setup-python-poetry@5bbf6603c5c930615ec8a29f1b5d7d258d905aa4 # v2.0.0
         with:
@@ -619,7 +659,7 @@ jobs:
           --health-retries 5
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
       - name: Add PostgreSQL apt repository
         # We need a version of pg_dump that can handle the version of
         # PostgreSQL being tested against. The Ubuntu package repository lags
@@ -674,7 +714,7 @@ jobs:
 
     steps:
       - name: Checkout synapse codebase
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
         with:
           path: synapse
 
@@ -710,7 +750,7 @@ jobs:
       - changes
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
 
       - name: Install Rust
         uses: dtolnay/rust-toolchain@b3b07ba8b418998c39fb20f53e8b695cdcc8de1b # master
@@ -730,7 +770,7 @@ jobs:
       - changes
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
 
       - name: Install Rust
         uses: dtolnay/rust-toolchain@b3b07ba8b418998c39fb20f53e8b695cdcc8de1b # master

.github/workflows/triage_labelled.yml

@@ -11,11 +11,15 @@ jobs:
     if: >
       contains(github.event.issue.labels.*.name, 'X-Needs-Info')
     steps:
-      - uses: actions/add-to-project@5b1a254a3546aef88e0a7724a77a623fa2e47c36 # main (v1.0.2 + 10 commits)
+      - uses: actions/add-to-project@c0c5949b017d0d4a39f7ba888255881bdac2a823 # v1.0.2
         id: add_project
         with:
           project-url: "https://github.com/orgs/matrix-org/projects/67"
           github-token: ${{ secrets.ELEMENT_BOT_TOKEN }}
+        # This action will error if the issue already exists on the project. Which is
+        # common as `X-Needs-Info` will often be added to issues that are already in
+        # the triage queue. Prevent the whole job from failing in this case.
+        continue-on-error: true
       - name: Set status
         env:
           GITHUB_TOKEN: ${{ secrets.ELEMENT_BOT_TOKEN }}

.github/workflows/twisted_trunk.yml

@@ -43,7 +43,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
 
       - name: Install Rust
         uses: dtolnay/rust-toolchain@b3b07ba8b418998c39fb20f53e8b695cdcc8de1b # master
@@ -70,7 +70,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
       - run: sudo apt-get -qq install xmlsec1
 
       - name: Install Rust
@@ -117,7 +117,7 @@ jobs:
         - ${{ github.workspace }}:/src
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
 
       - name: Install Rust
         uses: dtolnay/rust-toolchain@b3b07ba8b418998c39fb20f53e8b695cdcc8de1b # master
@@ -175,7 +175,7 @@ jobs:
 
     steps:
       - name: Run actions/checkout@v4 for synapse
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
         with:
           path: synapse
 
@@ -217,7 +217,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
       - uses: JasonEtco/create-an-issue@1b14a70e4d8dc185e5cc76d3bec9eab20257b2c5 # v2.9.2
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.rustfmt.toml

@@ -1 +1,6 @@
+# Unstable options are only available on a nightly toolchain and must be opted into
+unstable_features = true
+
+# `group_imports` is an unstable option that requires nightly Rust toolchain. Tracked by
+# https://github.com/rust-lang/rustfmt/issues/5083
 group_imports = "StdExternalCrate"

CHANGES.md

@@ -1,3 +1,230 @@
+# Synapse 1.137.0rc1 (2025-08-19)
+
+### Bugfixes
+
+- Fix a bug which could corrupt auth chains making it impossible to perform state resolution. ([\#18746](https://github.com/element-hq/synapse/issues/18746))
+- Fix error message in `register_new_matrix_user` utility script for empty `registration_shared_secret`. ([\#18780](https://github.com/element-hq/synapse/issues/18780))
+- Allow enabling [MSC4108](https://github.com/matrix-org/matrix-spec-proposals/pull/4108) when the stable Matrix Authentication Service integration is enabled. ([\#18832](https://github.com/element-hq/synapse/issues/18832))
+
+### Improved Documentation
+
+- Include IPv6 networks in `denied-peer-ips` of coturn setup. Contributed by @litetex. ([\#18781](https://github.com/element-hq/synapse/issues/18781))
+
+### Internal Changes
+
+- Update tests to ensure all database tables are emptied when purging a room. ([\#18794](https://github.com/element-hq/synapse/issues/18794))
+- Instrument the `encode_response` part of Sliding Sync requests for more complete traces in Jaeger. ([\#18815](https://github.com/element-hq/synapse/issues/18815))
+- Tag Sliding Sync traces when we `wait_for_events`. ([\#18816](https://github.com/element-hq/synapse/issues/18816))
+- Fix `portdb` CI by hardcoding the new `pg_dump` restrict key that was added due to [CVE-2025-8714](https://nvd.nist.gov/vuln/detail/cve-2025-8714). ([\#18824](https://github.com/element-hq/synapse/issues/18824))
+
+
+
+### Updates to locked dependencies
+
+* Bump actions/add-to-project from 5b1a254a3546aef88e0a7724a77a623fa2e47c36 to 0c37450c4be3b6a7582b2fb013c9ebfd9c8e9300. ([\#18557](https://github.com/element-hq/synapse/issues/18557))
+* Bump actions/cache from 4.2.3 to 4.2.4. ([\#18799](https://github.com/element-hq/synapse/issues/18799))
+* Bump actions/checkout from 4.2.2 to 4.3.0. ([\#18800](https://github.com/element-hq/synapse/issues/18800))
+* Bump actions/download-artifact from 4.3.0 to 5.0.0. ([\#18801](https://github.com/element-hq/synapse/issues/18801))
+* Bump docker/metadata-action from 5.7.0 to 5.8.0. ([\#18773](https://github.com/element-hq/synapse/issues/18773))
+* Bump mypy from 1.16.1 to 1.17.1. ([\#18775](https://github.com/element-hq/synapse/issues/18775))
+* Bump phonenumbers from 9.0.10 to 9.0.11. ([\#18797](https://github.com/element-hq/synapse/issues/18797))
+* Bump pygithub from 2.6.1 to 2.7.0. ([\#18779](https://github.com/element-hq/synapse/issues/18779))
+* Bump serde_json from 1.0.141 to 1.0.142. ([\#18776](https://github.com/element-hq/synapse/issues/18776))
+* Bump slab from 0.4.10 to 0.4.11. ([\#18809](https://github.com/element-hq/synapse/issues/18809))
+* Bump tokio from 1.47.0 to 1.47.1. ([\#18774](https://github.com/element-hq/synapse/issues/18774))
+* Bump types-pyyaml from 6.0.12.20250516 to 6.0.12.20250809. ([\#18798](https://github.com/element-hq/synapse/issues/18798))
+* Bump types-setuptools from 80.9.0.20250529 to 80.9.0.20250809. ([\#18796](https://github.com/element-hq/synapse/issues/18796))
+
+# Synapse 1.136.0 (2025-08-12)
+
+Note: This release includes the security fixes from `1.135.2` and `1.136.0rc2`, detailed below.
+
+### Bugfixes
+
+- Fix bug introduced in 1.135.2 and 1.136.0rc2 where the [Make Room Admin API](https://element-hq.github.io/synapse/latest/admin_api/rooms.html#make-room-admin-api) would not treat a room v12's creator power level as the highest in room. ([\#18805](https://github.com/element-hq/synapse/issues/18805))
+
+
+# Synapse 1.135.2 (2025-08-11)
+
+This is the Synapse portion of the [Matrix coordinated security release](https://matrix.org/blog/2025/07/security-predisclosure/). This release includes support for [room version](https://spec.matrix.org/v1.15/rooms/) 12 which fixes a number of security vulnerabilities, including [CVE-2025-49090](https://www.cve.org/CVERecord?id=CVE-2025-49090).
+
+The default room version is not changed. Not all clients will support room version 12 immediately, and not all users will be using the latest version of their clients. Large, public rooms are advised to wait a few weeks before upgrading to room version 12 to allow users throughout the Matrix ecosystem to update their clients.
+
+Note: release 1.135.1 was skipped due to issues discovered during the release process.
+
+Two patched Synapse releases are now available:
+
+* `1.135.2`: stable release comprised of `1.135.0` + security patches
+    * Upgrade to this release **if you are currently running 1.135.0 or below**.
+* `1.136.0rc2`: unstable release candidate comprised of `1.136.0rc1` + security patches.
+    * Upgrade to this release **only if you are on 1.136.0rc1**.
+
+### Bugfixes
+
+- Fix invalidation of storage cache that was broken in 1.135.0. ([\#18786](https://github.com/element-hq/synapse/issues/18786))
+
+### Internal Changes
+
+- Add a parameter to `upgrade_rooms(..)` to allow auto join local users. ([\#82](https://github.com/element-hq/synapse/issues/82))
+- Speed up upgrading a room with large numbers of banned users. ([\#18574](https://github.com/element-hq/synapse/issues/18574))
+
+
+# Synapse 1.136.0rc2 (2025-08-11)
+
+- Update MSC4293 redaction logic for room v12. ([\#80](https://github.com/element-hq/synapse/issues/80))
+
+### Internal Changes
+
+- Add a parameter to `upgrade_rooms(..)` to allow auto join local users. ([\#83](https://github.com/element-hq/synapse/issues/83))
+
+
+# Synapse 1.136.0rc1 (2025-08-05)
+
+Please check [the relevant section in the upgrade notes](https://github.com/element-hq/synapse/blob/develop/docs/upgrade.md#upgrading-to-v11360) as this release contains changes to MAS support, metrics labels and the module API which may require your attention when upgrading.
+
+### Features
+
+- Add configurable rate limiting for the creation of rooms. ([\#18514](https://github.com/element-hq/synapse/issues/18514))
+- Add support for [MSC4293](https://github.com/matrix-org/matrix-spec-proposals/pull/4293) - Redact on Kick/Ban. ([\#18540](https://github.com/element-hq/synapse/issues/18540))
+- When admins enable themselves to see soft-failed events, they will also see if the cause is due to the policy server flagging them as spam via `unsigned`. ([\#18585](https://github.com/element-hq/synapse/issues/18585))
+- Add ability to configure forward/outbound proxy via homeserver config instead of environment variables. See `http_proxy`, `https_proxy`, `no_proxy_hosts`. ([\#18686](https://github.com/element-hq/synapse/issues/18686))
+- Advertise experimental support for [MSC4306](https://github.com/matrix-org/matrix-spec-proposals/pull/4306) (Thread Subscriptions) through `/_matrix/clients/versions` if enabled. ([\#18722](https://github.com/element-hq/synapse/issues/18722))
+- Stabilise support for delegating authentication to [Matrix Authentication Service](https://github.com/element-hq/matrix-authentication-service/). ([\#18759](https://github.com/element-hq/synapse/issues/18759))
+- Implement the push rules for experimental [MSC4306: Thread Subscriptions](https://github.com/matrix-org/matrix-doc/issues/4306). ([\#18762](https://github.com/element-hq/synapse/issues/18762))
+
+### Bugfixes
+
+- Allow return code 403 (allowed by C2S Spec since v1.2) when fetching profiles via federation. ([\#18696](https://github.com/element-hq/synapse/issues/18696))
+- Register the MSC4306 (Thread Subscriptions) endpoints in the CS API when the experimental feature is enabled. ([\#18726](https://github.com/element-hq/synapse/issues/18726))
+- Fix a long-standing bug where suspended users could not have server notices sent to them (a 403 was returned to the admin). ([\#18750](https://github.com/element-hq/synapse/issues/18750))
+- Fix an issue that could cause logcontexts to be lost on rate-limited requests. Found by @realtyem. ([\#18763](https://github.com/element-hq/synapse/issues/18763))
+- Fix invalidation of storage cache that was broken in 1.135.0. ([\#18786](https://github.com/element-hq/synapse/issues/18786))
+
+### Improved Documentation
+
+- Minor improvements to README. ([\#18700](https://github.com/element-hq/synapse/issues/18700))
+- Document that there can be multiple workers handling the `receipts` stream. ([\#18760](https://github.com/element-hq/synapse/issues/18760))
+- Improve worker documentation for some device paths. ([\#18761](https://github.com/element-hq/synapse/issues/18761))
+
+### Deprecations and Removals
+
+- Deprecate `run_as_background_process` exported as part of the module API interface in favor of `ModuleApi.run_as_background_process`. See [the relevant section in the upgrade notes](https://github.com/element-hq/synapse/blob/develop/docs/upgrade.md#upgrading-to-v11360) for more information. ([\#18737](https://github.com/element-hq/synapse/issues/18737))
+
+### Internal Changes
+
+- Add debug logging for HMAC digest verification failures when using the admin API to register users. ([\#18474](https://github.com/element-hq/synapse/issues/18474))
+- Speed up upgrading a room with large numbers of banned users. ([\#18574](https://github.com/element-hq/synapse/issues/18574))
+- Fix config documentation generation script on Windows by enforcing UTF-8. ([\#18580](https://github.com/element-hq/synapse/issues/18580))
+- Refactor cache, background process, `Counter`, `LaterGauge`, `GaugeBucketCollector`, `Histogram`, and `Gauge` metrics to be homeserver-scoped. ([\#18656](https://github.com/element-hq/synapse/issues/18656), [\#18714](https://github.com/element-hq/synapse/issues/18714), [\#18715](https://github.com/element-hq/synapse/issues/18715), [\#18724](https://github.com/element-hq/synapse/issues/18724), [\#18753](https://github.com/element-hq/synapse/issues/18753), [\#18725](https://github.com/element-hq/synapse/issues/18725), [\#18670](https://github.com/element-hq/synapse/issues/18670), [\#18748](https://github.com/element-hq/synapse/issues/18748), [\#18751](https://github.com/element-hq/synapse/issues/18751))
+- Reduce database usage in Sliding Sync by not querying for background update completion after the update is known to be complete. ([\#18718](https://github.com/element-hq/synapse/issues/18718))
+- Improve order of validation and ratelimiting in room creation. ([\#18723](https://github.com/element-hq/synapse/issues/18723))
+- Bump minimum version bound on Twisted to 21.2.0. ([\#18727](https://github.com/element-hq/synapse/issues/18727), [\#18729](https://github.com/element-hq/synapse/issues/18729))
+- Use `twisted.internet.testing` module in tests instead of deprecated `twisted.test.proto_helpers`. ([\#18728](https://github.com/element-hq/synapse/issues/18728))
+- Remove obsolete `/send_event` replication endpoint. ([\#18730](https://github.com/element-hq/synapse/issues/18730))
+- Update metrics linting to be able to handle custom metrics. ([\#18733](https://github.com/element-hq/synapse/issues/18733))
+- Work around `twisted.protocols.amp.TooLong` error by reducing logging in some tests. ([\#18736](https://github.com/element-hq/synapse/issues/18736))
+- Prevent "Move labelled issues to correct projects" GitHub Actions workflow from failing when an issue is already on the project board. ([\#18755](https://github.com/element-hq/synapse/issues/18755))
+- Bump minimum supported Rust version (MSRV) to 1.82.0. Missed in [#18553](https://github.com/element-hq/synapse/pull/18553) (released in Synapse 1.134.0). ([\#18757](https://github.com/element-hq/synapse/issues/18757))
+- Make `Clock.sleep(...)` return a coroutine, so that mypy can catch places where we don't await on it. ([\#18772](https://github.com/element-hq/synapse/issues/18772))
+- Update implementation of [MSC4306: Thread Subscriptions](https://github.com/matrix-org/matrix-doc/issues/4306) to include automatic subscription conflict prevention as introduced in later drafts. ([\#18756](https://github.com/element-hq/synapse/issues/18756))
+
+
+
+### Updates to locked dependencies
+
+* Bump gitpython from 3.1.44 to 3.1.45. ([\#18743](https://github.com/element-hq/synapse/issues/18743))
+* Bump mypy-zope from 1.0.12 to 1.0.13. ([\#18744](https://github.com/element-hq/synapse/issues/18744))
+* Bump phonenumbers from 9.0.9 to 9.0.10. ([\#18741](https://github.com/element-hq/synapse/issues/18741))
+* Bump ruff from 0.12.4 to 0.12.5. ([\#18742](https://github.com/element-hq/synapse/issues/18742))
+* Bump sentry-sdk from 2.32.0 to 2.33.2. ([\#18745](https://github.com/element-hq/synapse/issues/18745))
+* Bump tokio from 1.46.1 to 1.47.0. ([\#18740](https://github.com/element-hq/synapse/issues/18740))
+* Bump types-jsonschema from 4.24.0.20250708 to 4.25.0.20250720. ([\#18703](https://github.com/element-hq/synapse/issues/18703))
+* Bump types-psycopg2 from 2.9.21.20250516 to 2.9.21.20250718. ([\#18706](https://github.com/element-hq/synapse/issues/18706))
+
+# Synapse 1.135.0 (2025-08-01)
+
+No significant changes since 1.135.0rc2.
+
+
+
+
+# Synapse 1.135.0rc2 (2025-07-30)
+
+### Bugfixes
+
+- Fix user failing to deactivate with MAS when `/_synapse/mas` is handled by a worker. ([\#18716](https://github.com/element-hq/synapse/issues/18716))
+
+### Internal Changes
+
+- Fix performance regression introduced in [#18238](https://github.com/element-hq/synapse/issues/18238) by adding a cache to `is_server_admin`. ([\#18747](https://github.com/element-hq/synapse/issues/18747))
+
+
+
+
+# Synapse 1.135.0rc1 (2025-07-22)
+
+### Features
+
+- Add `recaptcha_private_key_path` and `recaptcha_public_key_path` config option. ([\#17984](https://github.com/element-hq/synapse/issues/17984), [\#18684](https://github.com/element-hq/synapse/issues/18684))
+- Add plain-text handling for rich-text topics as per [MSC3765](https://github.com/matrix-org/matrix-spec-proposals/pull/3765). ([\#18195](https://github.com/element-hq/synapse/issues/18195))
+- If enabled by the user, server admins will see [soft failed](https://spec.matrix.org/v1.13/server-server-api/#soft-failure) events over the Client-Server API. ([\#18238](https://github.com/element-hq/synapse/issues/18238))
+- Add experimental support for [MSC4277: Harmonizing the reporting endpoints](https://github.com/matrix-org/matrix-spec-proposals/pull/4277). ([\#18263](https://github.com/element-hq/synapse/issues/18263))
+- Add ability to limit amount of media uploaded by a user in a given time period. ([\#18527](https://github.com/element-hq/synapse/issues/18527))
+- Enable workers to write directly to the device lists stream and handle device list updates, reducing load on the main process. ([\#18581](https://github.com/element-hq/synapse/issues/18581))
+- Support arbitrary profile fields. Contributed by @clokep. ([\#18635](https://github.com/element-hq/synapse/issues/18635))
+- Advertise support for Matrix v1.12. ([\#18647](https://github.com/element-hq/synapse/issues/18647))
+- Add an option to issue redactions as an admin user via the [admin redaction endpoint](https://element-hq.github.io/synapse/latest/admin_api/user_admin_api.html#redact-all-the-events-of-a-user). ([\#18671](https://github.com/element-hq/synapse/issues/18671))
+- Add experimental and incomplete support for [MSC4306: Thread Subscriptions](https://github.com/matrix-org/matrix-spec-proposals/blob/rei/msc_thread_subscriptions/proposals/4306-thread-subscriptions.md). ([\#18674](https://github.com/element-hq/synapse/issues/18674))
+- Include `event_id` when getting state with `?format=event`. Contributed by @tulir @ Beeper. ([\#18675](https://github.com/element-hq/synapse/issues/18675))
+
+### Bugfixes
+
+- Fix CPU and database spinning when retrying sending events to servers whilst at the same time purging those events. ([\#18499](https://github.com/element-hq/synapse/issues/18499))
+- Don't allow creation of tags with names longer than 255 bytes, [as per the spec](https://spec.matrix.org/v1.15/client-server-api/#events-14). ([\#18660](https://github.com/element-hq/synapse/issues/18660))
+- Fix `sliding_sync_connections`-related errors when porting from SQLite to Postgres. ([\#18677](https://github.com/element-hq/synapse/issues/18677))
+- Fix the MAS integration not working when Synapse is started with `--daemonize` or using `synctl`. ([\#18691](https://github.com/element-hq/synapse/issues/18691))
+
+### Improved Documentation
+
+- Document that some config options for the user directory are in violation of the Matrix spec. ([\#18548](https://github.com/element-hq/synapse/issues/18548))
+- Update `rc_delayed_event_mgmt` docs to the actual nesting level. Contributed by @HarHarLinks. ([\#18692](https://github.com/element-hq/synapse/issues/18692))
+
+### Internal Changes
+
+- Add a dedicated internal API for Matrix Authentication Service to Synapse communication. ([\#18520](https://github.com/element-hq/synapse/issues/18520))
+- Allow user registrations to be done on workers. ([\#18552](https://github.com/element-hq/synapse/issues/18552))
+- Remove unnecessary HTTP replication calls. ([\#18564](https://github.com/element-hq/synapse/issues/18564))
+- Refactor `Measure` block metrics to be homeserver-scoped. ([\#18601](https://github.com/element-hq/synapse/issues/18601))
+- Refactor cache metrics to be homeserver-scoped. ([\#18604](https://github.com/element-hq/synapse/issues/18604))
+- Unbreak "Latest dependencies" workflow by using the `--without dev` poetry option instead of removed `--no-dev`. ([\#18617](https://github.com/element-hq/synapse/issues/18617))
+- Update URL Preview code to work with `lxml` 6.0.0+. ([\#18622](https://github.com/element-hq/synapse/issues/18622))
+- Use `markdown-it-py` instead of `commonmark` in the release script. ([\#18637](https://github.com/element-hq/synapse/issues/18637))
+- Fix typing errors with upgraded mypy version. ([\#18653](https://github.com/element-hq/synapse/issues/18653))
+- Add doc comment explaining that config files are shallowly merged. ([\#18664](https://github.com/element-hq/synapse/issues/18664))
+- Minor speed up of insertion into `stream_positions` table. ([\#18672](https://github.com/element-hq/synapse/issues/18672))
+- Remove unused `allow_no_prev_events` option when creating an event. ([\#18676](https://github.com/element-hq/synapse/issues/18676))
+- Clean up `MetricsResource` and Prometheus hacks. ([\#18687](https://github.com/element-hq/synapse/issues/18687))
+- Fix dirty `Cargo.lock` changes appearing after install (`base64`). ([\#18689](https://github.com/element-hq/synapse/issues/18689))
+- Prevent dirty `Cargo.lock` changes from install. ([\#18693](https://github.com/element-hq/synapse/issues/18693))
+- Correct spelling of 'Admin token used' log line. ([\#18697](https://github.com/element-hq/synapse/issues/18697))
+- Reduce log spam when client stops downloading media while it is being streamed to them. ([\#18699](https://github.com/element-hq/synapse/issues/18699))
+
+
+
+### Updates to locked dependencies
+
+* Bump authlib from 1.6.0 to 1.6.1. ([\#18704](https://github.com/element-hq/synapse/issues/18704))
+* Bump base64 from 0.21.7 to 0.22.1. ([\#18666](https://github.com/element-hq/synapse/issues/18666))
+* Bump jsonschema from 4.24.0 to 4.25.0. ([\#18707](https://github.com/element-hq/synapse/issues/18707))
+* Bump lxml from 5.4.0 to 6.0.0. ([\#18631](https://github.com/element-hq/synapse/issues/18631))
+* Bump mypy from 1.13.0 to 1.16.1. ([\#18653](https://github.com/element-hq/synapse/issues/18653))
+* Bump once_cell from 1.19.0 to 1.21.3. ([\#18710](https://github.com/element-hq/synapse/issues/18710))
+* Bump phonenumbers from 9.0.8 to 9.0.9. ([\#18681](https://github.com/element-hq/synapse/issues/18681))
+* Bump ruff from 0.12.2 to 0.12.5. ([\#18683](https://github.com/element-hq/synapse/issues/18683), [\#18705](https://github.com/element-hq/synapse/issues/18705))
+* Bump serde_json from 1.0.140 to 1.0.141. ([\#18709](https://github.com/element-hq/synapse/issues/18709))
+* Bump sigstore/cosign-installer from 3.9.1 to 3.9.2. ([\#18708](https://github.com/element-hq/synapse/issues/18708))
+* Bump types-jsonschema from 4.24.0.20250528 to 4.24.0.20250708. ([\#18682](https://github.com/element-hq/synapse/issues/18682))
+
 # Synapse 1.134.0 (2025-07-15)
 
 No significant changes since 1.134.0rc1.

README.rst

@@ -8,7 +8,7 @@
 Synapse is an open source `Matrix <https://matrix.org>`__ homeserver
 implementation, written and maintained by `Element <https://element.io>`_.
 `Matrix <https://github.com/matrix-org>`__ is the open standard for
-secure and interoperable real time communications. You can directly run
+secure and interoperable real-time communications. You can directly run
 and manage the source code in this repository, available under an AGPL
 license (or alternatively under a commercial license from Element).
 There is no support provided by Element unless you have a
@@ -23,13 +23,13 @@ ESS builds on Synapse to offer a complete Matrix-based backend including the ful
 `Admin Console product <https://element.io/enterprise-functionality/admin-console>`_,
 giving admins the power to easily manage an organization-wide
 deployment. It includes advanced identity management, auditing,
-moderation and data retention options as well as Long Term Support and
-SLAs. ESS can be used to support any Matrix-based frontend client.
+moderation and data retention options as well as Long-Term Support and
+SLAs. ESS supports any Matrix-compatible client.
 
 .. contents::
 
-🛠️ Installing and configuration
-===============================
+🛠️ Installation and configuration
+==================================
 
 The Synapse documentation describes `how to install Synapse <https://element-hq.github.io/synapse/latest/setup/installation.html>`_. We recommend using
 `Docker images <https://element-hq.github.io/synapse/latest/setup/installation.html#docker-images-and-ansible-playbooks>`_ or `Debian packages from Matrix.org
@@ -133,7 +133,7 @@ connect from a client: see
 An easy way to get started is to login or register via Element at
 https://app.element.io/#/login or https://app.element.io/#/register respectively.
 You will need to change the server you are logging into from ``matrix.org``
-and instead specify a Homeserver URL of ``https://<server_name>:8448``
+and instead specify a homeserver URL of ``https://<server_name>:8448``
 (or just ``https://<server_name>`` if you are using a reverse proxy).
 If you prefer to use another client, refer to our
 `client breakdown <https://matrix.org/ecosystem/clients/>`_.
@@ -162,16 +162,15 @@ the public internet. Without it, anyone can freely register accounts on your hom
 This can be exploited by attackers to create spambots targeting the rest of the Matrix
 federation.
 
-Your new user name will be formed partly from the ``server_name``, and partly
-from a localpart you specify when you create the account. Your name will take
-the form of::
+Your new Matrix ID will be formed partly from the ``server_name``, and partly
+from a localpart you specify when you create the account in the form of::
 
     @localpart:my.domain.name
 
 (pronounced "at localpart on my dot domain dot name").
 
 As when logging in, you will need to specify a "Custom server".  Specify your
-desired ``localpart`` in the 'User name' box.
+desired ``localpart`` in the 'Username' box.
 
 🎯 Troubleshooting and support
 ==============================
@@ -209,10 +208,10 @@ Identity servers have the job of mapping email addresses and other 3rd Party
 IDs (3PIDs) to Matrix user IDs, as well as verifying the ownership of 3PIDs
 before creating that mapping.
 
-**They are not where accounts or credentials are stored - these live on home
-servers. Identity Servers are just for mapping 3rd party IDs to matrix IDs.**
+**Identity servers do not store accounts or credentials - these are stored and managed on homeservers.
+Identity Servers are just for mapping 3rd Party IDs to Matrix IDs.**
 
-This process is very security-sensitive, as there is obvious risk of spam if it
+This process is highly security-sensitive, as there is an obvious risk of spam if it
 is too easy to sign up for Matrix accounts or harvest 3PID data. In the longer
 term, we hope to create a decentralised system to manage it (`matrix-doc #712
 <https://github.com/matrix-org/matrix-doc/issues/712>`_), but in the meantime,
@@ -238,9 +237,9 @@ email address.
 We welcome contributions to Synapse from the community!
 The best place to get started is our
 `guide for contributors <https://element-hq.github.io/synapse/latest/development/contributing_guide.html>`_.
-This is part of our larger `documentation <https://element-hq.github.io/synapse/latest>`_, which includes
-
+This is part of our broader `documentation <https://element-hq.github.io/synapse/latest>`_, which includes
 information for Synapse developers as well as Synapse administrators.
+
 Developers might be particularly interested in:
 
 * `Synapse's database schema <https://element-hq.github.io/synapse/latest/development/database_schema.html>`_,

build_rust.py

@@ -19,17 +19,17 @@ def build(setup_kwargs: Dict[str, Any]) -> None:
         # This flag is a no-op in the latest versions. Instead, we need to
         # specify this in the `bdist_wheel` config below.
         py_limited_api=True,
-        # We force always building in release mode, as we can't tell the
-        # difference between using `poetry` in development vs production.
+        # We always build in release mode, as we can't distinguish
+        # between using `poetry` in development vs production.
         debug=False,
     )
     setup_kwargs.setdefault("rust_extensions", []).append(extension)
     setup_kwargs["zip_safe"] = False
 
-    # We lookup the minimum supported python version by looking at
-    # `python_requires` (e.g. ">=3.9.0,<4.0.0") and finding the first python
+    # We look up the minimum supported Python version with
+    # `python_requires` (e.g. ">=3.9.0,<4.0.0") and finding the first Python
     # version that matches. We then convert that into the `py_limited_api` form,
-    # e.g. cp39 for python 3.9.
+    # e.g. cp39 for Python 3.9.
     py_limited_api: str
     python_bounds = SpecifierSet(setup_kwargs["python_requires"])
     for minor_version in itertools.count(start=8):

changelog.d/18856.doc

@@ -0,0 +1 @@
+Clarify Python dependency constraints in our deprecation policy.

contrib/grafana/synapse.json

@@ -4396,7 +4396,7 @@
               "exemplar": false,
               "expr": "(time() - max without (job, index, host) (avg_over_time(synapse_federation_last_received_pdu_time[10m]))) / 60",
               "instant": false,
-              "legendFormat": "{{server_name}} ",
+              "legendFormat": "{{origin_server_name}} ",
               "range": true,
               "refId": "A"
             }
@@ -4518,7 +4518,7 @@
               "exemplar": false,
               "expr": "(time() - max without (job, index, host) (avg_over_time(synapse_federation_last_sent_pdu_time[10m]))) / 60",
               "instant": false,
-              "legendFormat": "{{server_name}}",
+              "legendFormat": "{{destination_server_name}}",
               "range": true,
               "refId": "A"
             }

debian/changelog

@@ -1,3 +1,57 @@
+matrix-synapse-py3 (1.137.0~rc1) stable; urgency=medium
+
+  * New Synapse release 1.137.0rc1.
+
+ -- Synapse Packaging team <packages@matrix.org>  Tue, 19 Aug 2025 10:55:22 +0100
+
+matrix-synapse-py3 (1.136.0) stable; urgency=medium
+
+  * New Synapse release 1.136.0.
+
+ -- Synapse Packaging team <packages@matrix.org>  Tue, 12 Aug 2025 13:18:03 +0100
+
+matrix-synapse-py3 (1.136.0~rc2) stable; urgency=medium
+
+  * New Synapse release 1.136.0rc2.
+
+ -- Synapse Packaging team <packages@matrix.org>  Mon, 11 Aug 2025 12:18:52 -0600
+
+matrix-synapse-py3 (1.136.0~rc1) stable; urgency=medium
+
+  * New Synapse release 1.136.0rc1.
+
+ -- Synapse Packaging team <packages@matrix.org>  Tue, 05 Aug 2025 08:13:30 -0600
+
+matrix-synapse-py3 (1.135.2) stable; urgency=medium
+
+  * New Synapse release 1.135.2.
+
+ -- Synapse Packaging team <packages@matrix.org>  Mon, 11 Aug 2025 11:52:01 -0600
+
+matrix-synapse-py3 (1.135.1) stable; urgency=medium
+
+  * New Synapse release 1.135.1.
+
+ -- Synapse Packaging team <packages@matrix.org>  Mon, 11 Aug 2025 11:13:15 -0600
+
+matrix-synapse-py3 (1.135.0) stable; urgency=medium
+
+  * New Synapse release 1.135.0.
+
+ -- Synapse Packaging team <packages@matrix.org>  Fri, 01 Aug 2025 13:12:28 +0100
+
+matrix-synapse-py3 (1.135.0~rc2) stable; urgency=medium
+
+  * New Synapse release 1.135.0rc2.
+
+ -- Synapse Packaging team <packages@matrix.org>  Wed, 30 Jul 2025 12:19:14 +0100
+
+matrix-synapse-py3 (1.135.0~rc1) stable; urgency=medium
+
+  * New Synapse release 1.135.0rc1.
+
+ -- Synapse Packaging team <packages@matrix.org>  Tue, 22 Jul 2025 12:08:37 +0100
+
 matrix-synapse-py3 (1.134.0) stable; urgency=medium
 
   * New Synapse release 1.134.0.

docker/complement/conf/start_for_complement.sh

@@ -54,7 +54,6 @@ if [[ -n "$SYNAPSE_COMPLEMENT_USE_WORKERS" ]]; then
     export SYNAPSE_WORKER_TYPES="\
       event_persister:2, \
       background_worker, \
-      frontend_proxy, \
       event_creator, \
       user_dir, \
       media_repository, \
@@ -65,6 +64,7 @@ if [[ -n "$SYNAPSE_COMPLEMENT_USE_WORKERS" ]]; then
       client_reader, \
       appservice, \
       pusher, \
+      device_lists:2, \
       stream_writers=account_data+presence+receipts+to_device+typing"
 
   fi

docker/complement/conf/workers-shared-extra.yaml.j2

@@ -98,6 +98,10 @@ rc_delayed_event_mgmt:
   per_second: 9999
   burst_count: 9999
 
+rc_room_creation:
+  per_second: 9999
+  burst_count: 9999
+
 federation_rr_transactions_per_room_per_second: 9999
 
 allow_device_name_lookup_over_federation: true

docker/configure_workers_and_start.py

@@ -178,6 +178,9 @@ WORKERS_CONFIG: Dict[str, Dict[str, Any]] = {
             "^/_matrix/client/(api/v1|r0|v3|unstable)/login$",
             "^/_matrix/client/(api/v1|r0|v3|unstable)/account/3pid$",
             "^/_matrix/client/(api/v1|r0|v3|unstable)/account/whoami$",
+            "^/_matrix/client/(api/v1|r0|v3|unstable)/account/deactivate$",
+            "^/_matrix/client/(api/v1|r0|v3|unstable)/devices(/|$)",
+            "^/_matrix/client/(r0|v3)/delete_devices$",
             "^/_matrix/client/versions$",
             "^/_matrix/client/(api/v1|r0|v3|unstable)/voip/turnServer$",
             "^/_matrix/client/(r0|v3|unstable)/register$",
@@ -194,6 +197,9 @@ WORKERS_CONFIG: Dict[str, Dict[str, Any]] = {
             "^/_matrix/client/(api/v1|r0|v3|unstable)/directory/room/.*$",
             "^/_matrix/client/(r0|v3|unstable)/capabilities$",
             "^/_matrix/client/(r0|v3|unstable)/notifications$",
+            "^/_matrix/client/(api/v1|r0|v3|unstable)/keys/upload",
+            "^/_matrix/client/(api/v1|r0|v3|unstable)/keys/device_signing/upload$",
+            "^/_matrix/client/(api/v1|r0|v3|unstable)/keys/signatures/upload$",
         ],
         "shared_extra_conf": {},
         "worker_extra_conf": "",
@@ -265,13 +271,6 @@ WORKERS_CONFIG: Dict[str, Dict[str, Any]] = {
         "shared_extra_conf": {},
         "worker_extra_conf": "",
     },
-    "frontend_proxy": {
-        "app": "synapse.app.generic_worker",
-        "listener_resources": ["client", "replication"],
-        "endpoint_patterns": ["^/_matrix/client/(api/v1|r0|v3|unstable)/keys/upload"],
-        "shared_extra_conf": {},
-        "worker_extra_conf": "",
-    },
     "account_data": {
         "app": "synapse.app.generic_worker",
         "listener_resources": ["client", "replication"],
@@ -306,6 +305,13 @@ WORKERS_CONFIG: Dict[str, Dict[str, Any]] = {
         "shared_extra_conf": {},
         "worker_extra_conf": "",
     },
+    "device_lists": {
+        "app": "synapse.app.generic_worker",
+        "listener_resources": ["client", "replication"],
+        "endpoint_patterns": [],
+        "shared_extra_conf": {},
+        "worker_extra_conf": "",
+    },
     "typing": {
         "app": "synapse.app.generic_worker",
         "listener_resources": ["client", "replication"],
@@ -322,6 +328,15 @@ WORKERS_CONFIG: Dict[str, Dict[str, Any]] = {
         "shared_extra_conf": {},
         "worker_extra_conf": "",
     },
+    "thread_subscriptions": {
+        "app": "synapse.app.generic_worker",
+        "listener_resources": ["client", "replication"],
+        "endpoint_patterns": [
+            "^/_matrix/client/unstable/io.element.msc4306/.*",
+        ],
+        "shared_extra_conf": {},
+        "worker_extra_conf": "",
+    },
 }
 
 # Templates for sections that may be inserted multiple times in config files
@@ -412,16 +427,18 @@ def add_worker_roles_to_shared_config(
     # streams
     instance_map = shared_config.setdefault("instance_map", {})
 
-    # This is a list of the stream_writers that there can be only one of. Events can be
-    # sharded, and therefore doesn't belong here.
-    singular_stream_writers = [
+    # This is a list of the stream_writers.
+    stream_writers = {
         "account_data",
+        "events",
+        "device_lists",
         "presence",
         "receipts",
         "to_device",
         "typing",
         "push_rules",
-    ]
+        "thread_subscriptions",
+    }
 
     # Worker-type specific sharding config. Now a single worker can fulfill multiple
     # roles, check each.
@@ -431,28 +448,11 @@ def add_worker_roles_to_shared_config(
     if "federation_sender" in worker_types_set:
         shared_config.setdefault("federation_sender_instances", []).append(worker_name)
 
-    if "event_persister" in worker_types_set:
-        # Event persisters write to the events stream, so we need to update
-        # the list of event stream writers
-        shared_config.setdefault("stream_writers", {}).setdefault("events", []).append(
-            worker_name
-        )
-
-        # Map of stream writer instance names to host/ports combos
-        if os.environ.get("SYNAPSE_USE_UNIX_SOCKET", False):
-            instance_map[worker_name] = {
-                "path": f"/run/worker.{worker_port}",
-            }
-        else:
-            instance_map[worker_name] = {
-                "host": "localhost",
-                "port": worker_port,
-            }
     # Update the list of stream writers. It's convenient that the name of the worker
     # type is the same as the stream to write. Iterate over the whole list in case there
     # is more than one.
     for worker in worker_types_set:
-        if worker in singular_stream_writers:
+        if worker in stream_writers:
             shared_config.setdefault("stream_writers", {}).setdefault(
                 worker, []
             ).append(worker_name)
@@ -876,6 +876,13 @@ def generate_worker_files(
         else:
             healthcheck_urls.append("http://localhost:%d/health" % (worker_port,))
 
+        # Special case for event_persister: those are just workers that write to
+        # the `events` stream. For other workers, the worker name is the same
+        # name of the stream they write to, but for some reason it is not the
+        # case for event_persister.
+        if "event_persister" in worker_types_set:
+            worker_types_set.add("events")
+
         # Update the shared config with sharding-related options if necessary
         add_worker_roles_to_shared_config(
             shared_config, worker_types_set, worker_name, worker_port

docs/SUMMARY.md

@@ -74,6 +74,7 @@
       - [Users](admin_api/user_admin_api.md)
       - [Server Version](admin_api/version_api.md)
       - [Federation](usage/administration/admin_api/federation.md)
+      - [Client-Server API Extensions](admin_api/client_server_api_extensions.md)
     - [Manhole](manhole.md)
     - [Monitoring](metrics-howto.md)
       - [Reporting Homeserver Usage Statistics](usage/administration/monitoring/reporting_homeserver_usage_statistics.md)

docs/admin_api/client_server_api_extensions.md

@@ -0,0 +1,67 @@
+# Client-Server API Extensions
+
+Server administrators can set special account data to change how the Client-Server API behaves for
+their clients. Setting the account data, or having it already set, as a non-admin has no effect.
+
+All configuration options can be set through the `io.element.synapse.admin_client_config` global 
+account data on the admin's user account. 
+
+Example:
+```
+PUT /_matrix/client/v3/user/{adminUserId}/account_data/io.element.synapse.admin_client_config
+{
+    "return_soft_failed_events": true
+}
+```
+
+## See soft failed events
+
+Learn more about soft failure from [the spec](https://spec.matrix.org/v1.14/server-server-api/#soft-failure).
+
+To receive soft failed events in APIs like `/sync` and `/messages`, set `return_soft_failed_events`
+to `true` in the admin client config. When `false`, the normal behaviour of these endpoints is to
+exclude soft failed events.
+
+**Note**: If the policy server flagged the event as spam and that caused soft failure, that will be indicated
+in the event's `unsigned` content like so:
+
+```json
+{
+  "type": "m.room.message",
+  "other": "event_fields_go_here",
+  "unsigned": {
+    "io.element.synapse.soft_failed": true,
+    "io.element.synapse.policy_server_spammy": true
+  }
+}
+```
+
+Default: `false`
+
+## See events marked spammy by policy servers
+
+Learn more about policy servers from [MSC4284](https://github.com/matrix-org/matrix-spec-proposals/pull/4284).
+
+Similar to `return_soft_failed_events`, clients logged in with admin accounts can see events which were
+flagged by the policy server as spammy (and thus soft failed) by setting `return_policy_server_spammy_events`
+to `true`.
+
+`return_policy_server_spammy_events` may be `true` while `return_soft_failed_events` is `false` to only see
+policy server-flagged events. When `return_soft_failed_events` is `true` however, `return_policy_server_spammy_events`
+is always `true`.
+
+Events which were flagged by the policy will be flagged as `io.element.synapse.policy_server_spammy` in the
+event's `unsigned` content, like so:
+
+```json
+{
+  "type": "m.room.message",
+  "other": "event_fields_go_here",
+  "unsigned": {
+    "io.element.synapse.soft_failed": true,
+    "io.element.synapse.policy_server_spammy": true
+  }
+}
+```
+
+Default: `true` if `return_soft_failed_events` is `true`, otherwise `false`

docs/admin_api/user_admin_api.md

@@ -1227,7 +1227,7 @@ See also the
 
 ## Controlling whether a user is shadow-banned
 
-Shadow-banning is a useful tool for moderating malicious or egregiously abusive users.
+Shadow-banning is a useful tool for moderating malicious or egregiously abusive users. 
 A shadow-banned users receives successful responses to their client-server API requests,
 but the events are not propagated into rooms. This can be an effective tool as it
 (hopefully) takes longer for the user to realise they are being moderated before
@@ -1464,8 +1464,11 @@ _Added in Synapse 1.72.0._
 
 ## Redact all the events of a user
 
-This endpoint allows an admin to redact the events of a given user. There are no restrictions on redactions for a 
-local user. By default, we puppet the user who sent the message to redact it themselves. Redactions for non-local users are issued using the admin user, and will fail in rooms where the admin user is not admin/does not have the specified power level to issue redactions. 
+This endpoint allows an admin to redact the events of a given user. There are no restrictions on
+redactions for a local user. By default, we puppet the user who sent the message to redact it themselves.
+Redactions for non-local users are issued using the admin user, and will fail in rooms where the
+admin user is not admin/does not have the specified power level to issue redactions. An option
+is provided to override the default and allow the admin to issue the redactions in all cases.  
 
 The API is 
 ```
@@ -1475,7 +1478,7 @@ POST /_synapse/admin/v1/user/$user_id/redact
   "rooms": ["!roomid1", "!roomid2"]
 }
 ```
-If an empty list is provided as the key for `rooms`, all events in all the rooms the user is member of will be redacted, 
+If an empty list is provided as the key for `rooms`, all events in all the rooms the user is member of will be redacted,
 otherwise all the events in the rooms provided in the request will be redacted. 
 
 The API starts redaction process running, and returns immediately with a JSON body with
@@ -1501,7 +1504,10 @@ The following JSON body parameter must be provided:
 The following JSON body parameters are optional:
 
 - `reason` - Reason the redaction is being requested, ie "spam", "abuse", etc. This will be included in each redaction event, and be visible to users.
-- `limit` - a limit on the number of the user's events to search for ones that can be redacted (events are redacted newest to oldest) in each room, defaults to 1000 if not provided
+- `limit` - a limit on the number of the user's events to search for ones that can be redacted (events are redacted newest to oldest) in each room, defaults to 1000 if not provided.
+- `use_admin` - If set to `true`, the admin user is used to issue the redactions, rather than puppeting the user. Useful
+ when the admin is also the moderator of the rooms that require redactions. Note that the redactions will fail in rooms
+ where the admin does not have the sufficient power level to issue the redactions.  
 
 _Added in Synapse 1.116.0._
 

docs/deprecation_policy.md

@@ -1,13 +1,11 @@
-Deprecation Policy for Platform Dependencies
-============================================
+# Deprecation Policy
 
-Synapse has a number of platform dependencies, including Python, Rust, 
-PostgreSQL and SQLite. This document outlines the policy towards which versions 
-we support, and when we drop support for versions in the future.
+Synapse has a number of **platform dependencies** (Python, Rust, PostgreSQL, and SQLite)
+and **application dependencies** (Python and Rust packages). This document outlines the
+policy towards which versions we support, and when we drop support for versions in the
+future.
 
-
-Policy
-------
+## Platform Dependencies
 
 Synapse follows the upstream support life cycles for Python and PostgreSQL,
 i.e. when a version reaches End of Life Synapse will withdraw support for that
@@ -26,8 +24,8 @@ The oldest supported version of SQLite is the version
 [provided](https://packages.debian.org/bullseye/libsqlite3-0) by
 [Debian oldstable](https://wiki.debian.org/DebianOldStable).
 
-Context
--------
+
+### Context
 
 It is important for system admins to have a clear understanding of the platform
 requirements of Synapse and its deprecation policies so that they can
@@ -50,4 +48,42 @@ the ecosystem.
 On a similar note, SQLite does not generally have a concept of "supported 
 release"; bugfixes are published for the latest minor release only. We chose to
 track Debian's oldstable as this is relatively conservative, predictably updated
-and is consistent with the `.deb` packages released by Matrix.org.
+and is consistent with the `.deb` packages released by Matrix.org.
+
+
+## Application dependencies
+
+For application-level Python dependencies, we often specify loose version constraints
+(ex. `>=X.Y.Z`) to be forwards compatible with any new versions. Upper bounds (`<A.B.C`)
+are only added when necessary to prevent known incompatibilities.
+
+When selecting a minimum version, while we are mindful of the impact on downstream
+package maintainers, our primary focus is on the maintainability and progress of Synapse
+itself.
+
+For developers, a Python dependency version can be considered a "no-brainer" upgrade once it is
+available in both the latest [Debian Stable](https://packages.debian.org/stable/) and
+[Ubuntu LTS](https://launchpad.net/ubuntu) repositories. No need to burden yourself with
+extra scrutiny or consideration at this point.
+
+We aggressively update Rust dependencies. Since these are statically linked and managed
+entirely by `cargo` during build, they *can* pose no ongoing maintenance burden on others.
+This allows us to freely upgrade to leverage the latest ecosystem advancements assuming
+they don't have their own system-level dependencies.
+
+
+### Context
+
+Because Python dependencies can easily be managed in a virtual environment, we are less
+concerned about the criteria for selecting minimum versions. The only thing of concern
+is making sure we're not making it unnecessarily difficult for downstream package
+maintainers. Generally, this just means avoiding the bleeding edge for a few months.
+
+The situation for Rust dependencies is fundamentally different. For packagers, the
+concerns around Python dependency versions do not apply. The `cargo` tool handles
+downloading and building all libraries to satisfy dependencies, and these libraries are
+statically linked into the final binary. This means that from a packager's perspective,
+the Rust dependency versions are an internal build detail, not a runtime dependency to
+be managed on the target system. Consequently, we have even greater flexibility to
+upgrade Rust dependencies as needed for the project. Some distros (e.g. Fedora) do
+package Rust libraries, but this appears to be the outlier rather than the norm.

docs/setup/forward_proxy.md

@@ -7,8 +7,23 @@ proxy is supported, not SOCKS proxy or anything else.
 
 ## Configure
 
-The `http_proxy`, `https_proxy`, `no_proxy` environment variables are used to
-specify proxy settings. The environment variable is not case sensitive.
+The proxy settings can be configured in the homeserver configuration file via
+[`http_proxy`](../usage/configuration/config_documentation.md#http_proxy),
+[`https_proxy`](../usage/configuration/config_documentation.md#https_proxy), and
+[`no_proxy_hosts`](../usage/configuration/config_documentation.md#no_proxy_hosts).
+
+`homeserver.yaml` example:
+```yaml
+http_proxy: http://USERNAME:PASSWORD@10.0.1.1:8080/
+https_proxy: http://USERNAME:PASSWORD@proxy.example.com:8080/
+no_proxy_hosts:
+  - master.hostname.example.com
+  - 10.1.0.0/16
+  - 172.30.0.0/16
+```
+
+The proxy settings can also be configured via the `http_proxy`, `https_proxy`,
+`no_proxy` environment variables. The environment variable is not case sensitive.
 - `http_proxy`: Proxy server to use for HTTP requests.
 - `https_proxy`: Proxy server to use for HTTPS requests.
 - `no_proxy`: Comma-separated list of hosts, IP addresses, or IP ranges in CIDR
@@ -44,7 +59,7 @@ The proxy will be **used** for:
 - phone-home stats
 - recaptcha validation
 - CAS auth validation
-- OpenID Connect
+- OpenID Connect (OIDC)
 - Outbound federation
 - Federation (checking public key revocation)
 - Fetching public keys of other servers
@@ -53,7 +68,7 @@ The proxy will be **used** for:
 It will **not be used** for:
 
 - Application Services
-- Identity servers
+- Matrix Identity servers
 - In worker configurations
   - connections between workers
   - connections from workers to Redis

docs/setup/turn/coturn.md

@@ -88,7 +88,8 @@ This will install and start a systemd service called `coturn`.
     denied-peer-ip=172.16.0.0-172.31.255.255
 
     # recommended additional local peers to block, to mitigate external access to internal services.
-    # https://www.rtcsec.com/article/slack-webrtc-turn-compromise-and-bug-bounty/#how-to-fix-an-open-turn-relay-to-address-this-vulnerability
+    # https://www.enablesecurity.com/blog/slack-webrtc-turn-compromise-and-bug-bounty/#how-to-fix-an-open-turn-relay-to-address-this-vulnerability
+    # https://www.enablesecurity.com/blog/cve-2020-26262-bypass-of-coturns-access-control-protection/#further-concerns-what-else
     no-multicast-peers
     denied-peer-ip=0.0.0.0-0.255.255.255
     denied-peer-ip=100.64.0.0-100.127.255.255
@@ -101,6 +102,14 @@ This will install and start a systemd service called `coturn`.
     denied-peer-ip=198.51.100.0-198.51.100.255
     denied-peer-ip=203.0.113.0-203.0.113.255
     denied-peer-ip=240.0.0.0-255.255.255.255
+    denied-peer-ip=::1
+    denied-peer-ip=64:ff9b::-64:ff9b::ffff:ffff
+    denied-peer-ip=::ffff:0.0.0.0-::ffff:255.255.255.255
+    denied-peer-ip=100::-100::ffff:ffff:ffff:ffff
+    denied-peer-ip=2001::-2001:1ff:ffff:ffff:ffff:ffff:ffff:ffff
+    denied-peer-ip=2002::-2002:ffff:ffff:ffff:ffff:ffff:ffff:ffff
+    denied-peer-ip=fc00::-fdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
+    denied-peer-ip=fe80::-febf:ffff:ffff:ffff:ffff:ffff:ffff:ffff
 
     # special case the turn server itself so that client->TURN->TURN->client flows work
     # this should be one of the turn server's listening IPs

docs/upgrade.md

@@ -117,6 +117,85 @@ each upgrade are complete before moving on to the next upgrade, to avoid
 stacking them up. You can monitor the currently running background updates with
 [the Admin API](usage/administration/admin_api/background_updates.html#status).
 
+# Upgrading to v1.136.0
+
+## Deprecate `run_as_background_process` exported as part of the module API interface in favor of `ModuleApi.run_as_background_process`
+
+The `run_as_background_process` function is now a method of the `ModuleApi` class. If
+you were using the function directly from the module API, it will continue to work fine
+but the background process metrics will not include an accurate `server_name` label.
+This kind of metric labeling isn't relevant for many use cases and is used to
+differentiate Synapse instances running in the same Python process (relevant to Synapse
+Pro: Small Hosts). We recommend updating your usage to use the new
+`ModuleApi.run_as_background_process` method to stay on top of future changes.
+
+<details>
+<summary>Example <code>run_as_background_process</code> upgrade</summary>
+
+Before:
+```python
+class MyModule:
+    def __init__(self, module_api: ModuleApi) -> None:
+        run_as_background_process(__name__ + ":setup_database", self.setup_database)
+```
+
+After:
+```python
+class MyModule:
+    def __init__(self, module_api: ModuleApi) -> None:
+        module_api.run_as_background_process(__name__ + ":setup_database", self.setup_database)
+```
+
+</details>
+
+## Metric labels have changed on `synapse_federation_last_received_pdu_time` and `synapse_federation_last_sent_pdu_time`
+
+Previously, the `synapse_federation_last_received_pdu_time` and
+`synapse_federation_last_sent_pdu_time` metrics both used the `server_name` label to
+differentiate between different servers that we send and receive events from.
+
+Since we're now using the `server_name` label to differentiate between different Synapse
+homeserver instances running in the same process, these metrics have been changed as follows:
+
+ - `synapse_federation_last_received_pdu_time` now uses the `origin_server_name` label
+ - `synapse_federation_last_sent_pdu_time` now uses the `destination_server_name` label
+
+The Grafana dashboard JSON in `contrib/grafana/synapse.json` has been updated to reflect
+this change but you will need to manually update your own existing Grafana dashboards
+using these metrics.
+
+## Stable integration with Matrix Authentication Service
+
+Support for [Matrix Authentication Service (MAS)](https://github.com/element-hq/matrix-authentication-service) is now stable, with a simplified configuration.
+This stable integration requires MAS 0.20.0 or later.
+
+The existing `experimental_features.msc3861` configuration option is now deprecated and will be removed in Synapse v1.137.0.
+
+Synapse deployments already using MAS should now use the new configuration options:
+
+```yaml
+matrix_authentication_service:
+  # Enable the MAS integration
+  enabled: true
+  # The base URL where Synapse will contact MAS
+  endpoint: http://localhost:8080
+  # The shared secret used to authenticate MAS requests, must be the same as `matrix.secret` in the MAS configuration
+  # See https://element-hq.github.io/matrix-authentication-service/reference/configuration.html#matrix
+  secret: "asecurerandomsecretstring"
+```
+
+They must remove the `experimental_features.msc3861` configuration option from their configuration.
+
+They can also remove the client previously used by Synapse [in the MAS configuration](https://element-hq.github.io/matrix-authentication-service/reference/configuration.html#clients) as it is no longer in use.
+
+# Upgrading to v1.135.0
+
+## `on_user_registration` module API callback may now run on any worker
+
+Previously, the `on_user_registration` callback would only run on the main
+process. Modules relying on this callback must assume that they may now be
+called from any worker, not just the main process.
+
 # Upgrading to v1.134.0
 
 ## ICU bundled with Synapse
@@ -129,10 +208,10 @@ native ICU library on your system is no longer required.
 ## Documented endpoint which can be delegated to a federation worker
 
 The endpoint `^/_matrix/federation/v1/version$` can be delegated to a federation
-worker. This is not new behaviour, but had not been documented yet. The 
-[list of delegatable endpoints](workers.md#synapseappgeneric_worker) has 
+worker. This is not new behaviour, but had not been documented yet. The
+[list of delegatable endpoints](workers.md#synapseappgeneric_worker) has
 been updated to include it. Make sure to check your reverse proxy rules if you
-are using workers. 
+are using workers.
 
 # Upgrading to v1.126.0
 

docs/usage/configuration/config_documentation.md

@@ -610,6 +610,61 @@ manhole_settings:
   ssh_pub_key_path: CONFDIR/id_rsa.pub
 ```
 ---
+### `http_proxy`
+
+*(string|null)* Proxy server to use for HTTP requests.
+For more details, see the [forward proxy documentation](../../setup/forward_proxy.md). There is no default for this option.
+
+Example configuration:
+```yaml
+http_proxy: http://USERNAME:PASSWORD@10.0.1.1:8080/
+```
+---
+### `https_proxy`
+
+*(string|null)* Proxy server to use for HTTPS requests.
+For more details, see the [forward proxy documentation](../../setup/forward_proxy.md). There is no default for this option.
+
+Example configuration:
+```yaml
+https_proxy: http://USERNAME:PASSWORD@proxy.example.com:8080/
+```
+---
+### `no_proxy_hosts`
+
+*(array)* List of hosts, IP addresses, or IP ranges in CIDR format which should not use the proxy. Synapse will directly connect to these hosts.
+For more details, see the [forward proxy documentation](../../setup/forward_proxy.md). There is no default for this option.
+
+Example configuration:
+```yaml
+no_proxy_hosts:
+- master.hostname.example.com
+- 10.1.0.0/16
+- 172.30.0.0/16
+```
+---
+### `matrix_authentication_service`
+
+*(object)* The `matrix_authentication_service` setting configures integration with [Matrix Authentication Service (MAS)](https://github.com/element-hq/matrix-authentication-service).
+
+This setting has the following sub-options:
+
+* `enabled` (boolean): Whether or not to enable the MAS integration. If this is set to `false`, Synapse will use its legacy internal authentication API. Defaults to `false`.
+
+* `endpoint` (string): The URL where Synapse can reach MAS. This *must* have the `discovery` and `oauth` resources mounted. Defaults to `"http://localhost:8080"`.
+
+* `secret` (string|null): A shared secret that will be used to authenticate requests from and to MAS.
+
+* `secret_path` (string|null): Alternative to `secret`, reading the shared secret from a file. The file should be a plain text file, containing only the secret. Synapse reads the secret from the given file once at startup.
+
+Example configuration:
+```yaml
+matrix_authentication_service:
+  enabled: true
+  secret: someverysecuresecret
+  endpoint: http://localhost:8080
+```
+---
 ### `dummy_events_threshold`
 
 *(integer)* Forward extremities can build up in a room due to networking delays between homeservers. Once this happens in a large room, calculation of the state of that room can become quite expensive. To mitigate this, once the number of forward extremities reaches a given threshold, Synapse will send an `org.matrix.dummy_event` event, which will reduce the forward extremities in the room.
@@ -1925,9 +1980,8 @@ This setting has the following sub-options:
 Default configuration:
 ```yaml
 rc_delayed_event_mgmt:
-  per_user:
-    per_second: 1.0
-    burst_count: 5.0
+  per_second: 1.0
+  burst_count: 5.0
 ```
 
 Example configuration:
@@ -1964,6 +2018,31 @@ rc_reports:
   burst_count: 20.0
 ```
 ---
+### `rc_room_creation`
+
+*(object)* Sets rate limits for how often users are able to create rooms.
+
+This setting has the following sub-options:
+
+* `per_second` (number): Maximum number of requests a client can send per second.
+
+* `burst_count` (number): Maximum number of requests a client can send before being throttled.
+
+Default configuration:
+```yaml
+rc_room_creation:
+  per_user:
+    per_second: 0.016
+    burst_count: 10.0
+```
+
+Example configuration:
+```yaml
+rc_room_creation:
+  per_second: 1.0
+  burst_count: 5.0
+```
+---
 ### `federation_rr_transactions_per_room_per_second`
 
 *(integer)* Sets outgoing federation transaction frequency for sending read-receipts, per-room.
@@ -2086,6 +2165,23 @@ Example configuration:
 max_upload_size: 60M
 ```
 ---
+### `media_upload_limits`
+
+*(array)* A list of media upload limits defining how much data a given user can upload in a given time period.
+
+An empty list means no limits are applied.
+
+Defaults to `[]`.
+
+Example configuration:
+```yaml
+media_upload_limits:
+- time_period: 1h
+  max_size: 100M
+- time_period: 1w
+  max_size: 500M
+```
+---
 ### `max_image_pixels`
 
 *(byte size)* Maximum number of pixels that will be thumbnailed. Defaults to `"32M"`.
@@ -2340,6 +2436,21 @@ Example configuration:
 recaptcha_public_key: YOUR_PUBLIC_KEY
 ```
 ---
+### `recaptcha_public_key_path`
+
+*(string|null)* An alternative to [`recaptcha_public_key`](#recaptcha_public_key): allows the public key to be specified in an external file.
+
+The file should be a plain text file, containing only the public key. Synapse reads the public key from the given file once at startup.
+
+_Added in Synapse 1.135.0._
+
+Defaults to `null`.
+
+Example configuration:
+```yaml
+recaptcha_public_key_path: /path/to/key/file
+```
+---
 ### `recaptcha_private_key`
 
 *(string|null)* This homeserver's ReCAPTCHA private key. Must be specified if [`enable_registration_captcha`](#enable_registration_captcha) is enabled. Defaults to `null`.
@@ -2349,6 +2460,21 @@ Example configuration:
 recaptcha_private_key: YOUR_PRIVATE_KEY
 ```
 ---
+### `recaptcha_private_key_path`
+
+*(string|null)* An alternative to [`recaptcha_private_key`](#recaptcha_private_key): allows the private key to be specified in an external file.
+
+The file should be a plain text file, containing only the private key. Synapse reads the private key from the given file once at startup.
+
+_Added in Synapse 1.135.0._
+
+Defaults to `null`.
+
+Example configuration:
+```yaml
+recaptcha_private_key_path: /path/to/key/file
+```
+---
 ### `enable_registration_captcha`
 
 *(boolean)* Set to `true` to require users to complete a CAPTCHA test when registering an account. Requires a valid ReCaptcha public/private key.
@@ -3761,7 +3887,11 @@ encryption_enabled_by_default_for_room_type: invite
 
 This setting has the following sub-options:
 
-* `enabled` (boolean): Defines whether users can search the user directory. If false then empty responses are returned to all queries. Defaults to `true`.
+* `enabled` (boolean): Defines whether users can search the user directory. If `false` then empty responses are returned to all queries.
+
+  *Warning: While the homeserver may determine which subset of users are searched, the Matrix specification requires homeservers to include (at minimum) users visible in public rooms and users sharing a room with the requester. Using `false` improves performance but violates this requirement.*
+
+  Defaults to `true`.
 
 * `search_all_users` (boolean): Defines whether to search all users visible to your homeserver at the time the search is performed. If set to true, will return all users known to the homeserver matching the search query. If false, search results will only contain users visible in public rooms and users sharing a room with the requester.
 
@@ -4044,7 +4174,7 @@ The default power levels for each preset are:
 "m.room.history_visibility": 100
 "m.room.canonical_alias": 50
 "m.room.avatar": 50
-"m.room.tombstone": 100
+"m.room.tombstone": 100 (150 if MSC4289 is used)
 "m.room.server_acl": 100
 "m.room.encryption": 100
 ```
@@ -4291,6 +4421,8 @@ This setting has the following sub-options:
 
 * `push_rules` (string): Name of a worker assigned to the `push_rules` stream.
 
+* `device_lists` (string): Name of a worker assigned to the `device_lists` stream.
+
 Example configuration:
 ```yaml
 stream_writers:

docs/workers.md

@@ -238,7 +238,9 @@ information.
     ^/_matrix/client/unstable/im.nheko.summary/summary/.*$
     ^/_matrix/client/(r0|v3|unstable)/account/3pid$
     ^/_matrix/client/(r0|v3|unstable)/account/whoami$
-    ^/_matrix/client/(r0|v3|unstable)/devices$
+    ^/_matrix/client/(r0|v3|unstable)/account/deactivate$
+    ^/_matrix/client/(r0|v3)/delete_devices$
+    ^/_matrix/client/(api/v1|r0|v3|unstable)/devices(/|$)
     ^/_matrix/client/versions$
     ^/_matrix/client/(api/v1|r0|v3|unstable)/voip/turnServer$
     ^/_matrix/client/(api/v1|r0|v3|unstable)/rooms/.*/event/
@@ -257,7 +259,9 @@ information.
     ^/_matrix/client/(r0|v3|unstable)/keys/changes$
     ^/_matrix/client/(r0|v3|unstable)/keys/claim$
     ^/_matrix/client/(r0|v3|unstable)/room_keys/
-    ^/_matrix/client/(r0|v3|unstable)/keys/upload$
+    ^/_matrix/client/(r0|v3|unstable)/keys/upload
+    ^/_matrix/client/(api/v1|r0|v3|unstable)/keys/device_signing/upload$
+    ^/_matrix/client/(api/v1|r0|v3|unstable)/keys/signatures/upload$
 
     # Registration/login requests
     ^/_matrix/client/(api/v1|r0|v3|unstable)/login$
@@ -282,7 +286,6 @@ Additionally, the following REST endpoints can be handled for GET requests:
 
     ^/_matrix/client/(api/v1|r0|v3|unstable)/pushrules/
     ^/_matrix/client/unstable/org.matrix.msc4140/delayed_events
-    ^/_matrix/client/(api/v1|r0|v3|unstable)/devices/
 
     # Account data requests
     ^/_matrix/client/(r0|v3|unstable)/.*/tags
@@ -329,7 +332,6 @@ set to `true`), the following endpoints can be handled by the worker:
     ^/_synapse/admin/v2/users/[^/]+$
     ^/_synapse/admin/v1/username_available$
     ^/_synapse/admin/v1/users/[^/]+/_allow_cross_signing_replacement_without_uia$
-    # Only the GET method:
     ^/_synapse/admin/v1/users/[^/]+/devices$
 
 Note that a [HTTP listener](usage/configuration/config_documentation.md#listeners)
@@ -530,8 +532,9 @@ the stream writer for the `account_data` stream:
 
 ##### The `receipts` stream
 
-The following endpoints should be routed directly to the worker configured as
-the stream writer for the `receipts` stream:
+The `receipts` stream supports multiple writers. The following endpoints
+can be handled by any worker, but should be routed directly to one of the workers
+configured as stream writer for the `receipts` stream:
 
     ^/_matrix/client/(r0|v3|unstable)/rooms/.*/receipt
     ^/_matrix/client/(r0|v3|unstable)/rooms/.*/read_markers
@@ -550,6 +553,18 @@ the stream writer for the `push_rules` stream:
 
     ^/_matrix/client/(api/v1|r0|v3|unstable)/pushrules/
 
+##### The `device_lists` stream
+
+The `device_lists` stream supports multiple writers. The following endpoints
+can be handled by any worker, but should be routed directly to one of the workers
+configured as stream writer for the `device_lists` stream:
+
+    ^/_matrix/client/(r0|v3)/delete_devices$
+    ^/_matrix/client/(api/v1|r0|v3|unstable)/devices(/|$)
+    ^/_matrix/client/(r0|v3|unstable)/keys/upload
+    ^/_matrix/client/(api/v1|r0|v3|unstable)/keys/device_signing/upload$
+    ^/_matrix/client/(api/v1|r0|v3|unstable)/keys/signatures/upload$
+
 #### Restrict outbound federation traffic to a specific set of workers
 
 The

mypy.ini

@@ -1,6 +1,17 @@
 [mypy]
 namespace_packages = True
-plugins = pydantic.mypy, mypy_zope:plugin, scripts-dev/mypy_synapse_plugin.py
+# Our custom mypy plugin should remain first in this list.
+#
+# mypy has a limitation where it only chooses the first plugin that returns a non-None
+# value for each hook (known-limitation, c.f.
+# https://github.com/python/mypy/issues/19524). We workaround this by putting our custom
+# plugin first in the plugin order and then manually calling any other conflicting
+# plugin hooks in our own plugin followed by our own checks.
+#
+# If you add a new plugin, make sure to check whether the hooks being used conflict with
+# our custom plugin hooks and if so, manually call the other plugin's hooks in our
+# custom plugin. (also applies to if the plugin is updated in the future)
+plugins = scripts-dev/mypy_synapse_plugin.py, pydantic.mypy, mypy_zope:plugin
 follow_imports = normal
 show_error_codes = True
 show_traceback = True
@@ -99,3 +110,6 @@ ignore_missing_imports = True
 
 [mypy-multipart.*]
 ignore_missing_imports = True
+
+[mypy-mypy_zope.*]
+ignore_missing_imports = True

poetry.lock

@@ -34,15 +34,15 @@ tests-mypy = ["mypy (>=1.11.1) ; platform_python_implementation == \"CPython\" a
 
 [[package]]
 name = "authlib"
-version = "1.6.0"
+version = "1.6.1"
 description = "The ultimate Python library in building OAuth and OpenID Connect servers and clients."
 optional = true
 python-versions = ">=3.9"
 groups = ["main"]
 markers = "extra == \"all\" or extra == \"jwt\" or extra == \"oidc\""
 files = [
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 [package.dependencies]
@@ -366,21 +366,6 @@ files = [
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-[[package]]
-name = "commonmark"
-version = "0.9.1"
-description = "Python parser for the CommonMark Markdown spec"
-optional = false
-python-versions = "*"
-groups = ["dev"]
-files = [
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-
-[package.extras]
-test = ["flake8 (==3.7.8)", "hypothesis (==3.55.3)"]
-
 [[package]]
 name = "constantly"
 version = "15.1.0"
@@ -456,24 +441,6 @@ files = [
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-[[package]]
-name = "deprecated"
-version = "1.2.13"
-description = "Python @deprecated decorator to deprecate old python classes, functions or methods."
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-groups = ["dev"]
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-
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-
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-
 [[package]]
 name = "docutils"
 version = "0.19"
@@ -519,18 +486,19 @@ smmap = ">=3.0.1,<6"
 
 [[package]]
 name = "gitpython"
-version = "3.1.44"
+version = "3.1.45"
 description = "GitPython is a Python library used to interact with Git repositories"
 optional = false
 python-versions = ">=3.7"
 groups = ["dev"]
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 [package.dependencies]
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+typing-extensions = {version = ">=3.10.0.2", markers = "python_version < \"3.10\""}
 
 [package.extras]
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@@ -951,14 +919,14 @@ i18n = ["Babel (>=2.7)"]
 
 [[package]]
 name = "jsonschema"
-version = "4.24.0"
+version = "4.25.0"
 description = "An implementation of JSON Schema validation for Python"
 optional = false
 python-versions = ">=3.9"
 groups = ["main"]
 files = [
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 [package.dependencies]
@@ -969,7 +937,7 @@ rpds-py = ">=0.7.1"
 
 [package.extras]
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+format-nongpl = ["fqdn", "idna", "isoduration", "jsonpointer (>1.13)", "rfc3339-validator", "rfc3986-validator (>0.1.0)", "rfc3987-syntax (>=1.1.0)", "uri-template", "webcolors (>=24.6.0)"]
 
 [[package]]
 name = "jsonschema-specifications"
@@ -1029,145 +997,107 @@ pyasn1 = ">=0.4.6"
 
 [[package]]
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-version = "5.4.0"
+version = "6.0.0"
 description = "Powerful and Pythonic XML processing library combining libxml2/libxslt with the ElementTree API."
 optional = true
-python-versions = ">=3.6"
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 [package.extras]
@@ -1175,7 +1105,6 @@ cssselect = ["cssselect (>=0.7)"]
 html-clean = ["lxml_html_clean"]
 html5 = ["html5lib"]
 htmlsoup = ["BeautifulSoup4"]
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 [[package]]
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@@ -1194,14 +1123,14 @@ test = ["coverage[toml] (>=7.2.5)", "mypy (>=1.2.0)", "pytest (>=7.3.0)", "pytes
 
 [[package]]
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 [package.dependencies]
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 linkify = ["linkify-it-py (>=1,<3)"]
 plugins = ["mdit-py-plugins"]
 profiling = ["gprof2dot"]
-rtd = ["attrs", "myst-parser", "pyyaml", "sphinx", "sphinx-copybutton", "sphinx-design", "sphinx_book_theme"]
+rtd = ["jupyter_sphinx", "mdit-py-plugins", "myst-parser", "pyyaml", "sphinx", "sphinx-copybutton", "sphinx-design", "sphinx_book_theme"]
 testing = ["coverage", "pytest", "pytest-cov", "pytest-regressions"]
 
 [[package]]
@@ -1440,50 +1369,57 @@ docs = ["sphinx (>=8,<9)", "sphinx-autobuild"]
 
 [[package]]
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 tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
-typing-extensions = ">=4.6.0"
+typing_extensions = ">=4.6.0"
 
 [package.extras]
 dmypy = ["psutil (>=4.0)"]
@@ -1506,18 +1442,18 @@ files = [
 
 [[package]]
 name = "mypy-zope"
-version = "1.0.12"
+version = "1.0.13"
 description = "Plugin for mypy to support zope interfaces"
 optional = false
 python-versions = "*"
 groups = ["dev"]
 files = [
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 [package.dependencies]
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 "zope.interface" = "*"
 "zope.schema" = "*"
 
@@ -1581,16 +1517,28 @@ files = [
 [package.extras]
 dev = ["jinja2"]
 
+[[package]]
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+version = "0.12.1"
+description = "Utility library for gitignore style pattern matching of file paths."
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+python-versions = ">=3.8"
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 [[package]]
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 description = "Python version of Google's common library for parsing, formatting, storing and validating international phone numbers."
 optional = false
 python-versions = "*"
 groups = ["main"]
 files = [
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 [[package]]
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 [[package]]
 name = "pygithub"
-version = "2.6.1"
+version = "2.7.0"
 description = "Use the full Github API v3"
 optional = false
 python-versions = ">=3.8"
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 [package.dependencies]
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 pynacl = ">=1.4.0"
 requests = ">=2.14.0"
-typing-extensions = ">=4.0.0"
+typing-extensions = ">=4.5.0"
 urllib3 = ">=1.26.0"
 
 [[package]]
@@ -2322,19 +2269,20 @@ idna2008 = ["idna"]
 
 [[package]]
 name = "rich"
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+version = "14.0.0"
 description = "Render rich text, tables, progress bars, syntax highlighting, markdown and more to the terminal"
 optional = false
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+python-versions = ">=3.8.0"
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 ]
 
 [package.dependencies]
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+markdown-it-py = ">=2.2.0"
 pygments = ">=2.13.0,<3.0.0"
+typing-extensions = {version = ">=4.0.0,<5.0", markers = "python_version < \"3.11\""}
 
 [package.extras]
 jupyter = ["ipywidgets (>=7.5.1,<9)"]
@@ -2448,30 +2396,30 @@ files = [
 
 [[package]]
 name = "ruff"
-version = "0.12.2"
+version = "0.12.7"
 description = "An extremely fast Python linter and code formatter, written in Rust."
 optional = false
 python-versions = ">=3.7"
 groups = ["dev"]
 files = [
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 [package.dependencies]
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 [[package]]
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 [[package]]
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 [[package]]
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-]
-
 [[package]]
 name = "xmlschema"
 version = "2.4.0"
@@ -3404,4 +3255,4 @@ url-preview = ["lxml"]
 [metadata]
 lock-version = "2.1"
 python-versions = "^3.9.0"
-content-hash = "6871453202e2ffc3c9ee5761481e0ef4ad99f08d9b8f24c6d6a64c2683683845"
+content-hash = "600a349d08dde732df251583094a121b5385eb43ae0c6ceff10dcf9749359446"

pyproject.toml

@@ -101,7 +101,7 @@ module-name = "synapse.synapse_rust"
 
 [tool.poetry]
 name = "matrix-synapse"
-version = "1.134.0"
+version = "1.137.0rc1"
 description = "Homeserver for the Matrix decentralised comms protocol"
 authors = ["Matrix.org Team and Contributors <packages@matrix.org>"]
 license = "AGPL-3.0-or-later"
@@ -178,8 +178,13 @@ signedjson = "^1.1.0"
 service-identity = ">=18.1.0"
 # Twisted 18.9 introduces some logger improvements that the structured
 # logger utilises
-Twisted = {extras = ["tls"], version = ">=18.9.0"}
-treq = ">=15.1"
+# Twisted 19.7.0 moves test helpers to a new module and deprecates the old location.
+# Twisted 21.2.0 introduces contextvar support.
+# We could likely bump this to 22.1 without making distro packagers'
+# lives hard (as of 2025-07, distro support is Ubuntu LTS: 22.1, Debian stable: 22.4,
+# RHEL 9: 22.10)
+Twisted = {extras = ["tls"], version = ">=21.2.0"}
+treq = ">=21.5.0"
 # Twisted has required pyopenssl 16.0 since about Twisted 16.6.
 pyOpenSSL = ">=16.0.0"
 PyYAML = ">=5.3"
@@ -195,7 +200,9 @@ pymacaroons = ">=0.13.0"
 msgpack = ">=0.5.2"
 phonenumbers = ">=8.2.0"
 # we use GaugeHistogramMetric, which was added in prom-client 0.4.0.
-prometheus-client = ">=0.4.0"
+# `prometheus_client.metrics` was added in 0.5.0, so we require that too.
+# We chose 0.6.0 as that is the current version in Debian Buster (oldstable).
+prometheus-client = ">=0.6.0"
 # we use `order`, which arrived in attrs 19.2.0.
 # Note: 21.1.0 broke `/sync`, see https://github.com/matrix-org/synapse/issues/9936
 attrs = ">=19.2.0,!=21.1.0"
@@ -224,7 +231,7 @@ pydantic = ">=1.7.4, <3"
 # https://github.com/python-poetry/poetry/issues/6154). Both `pip install` and
 # `poetry build` do the right thing without this explicit dependency.
 #
-# This isn't really a dev-dependency, as `poetry install --no-dev` will fail,
+# This isn't really a dev-dependency, as `poetry install --without dev` will fail,
 # but the alternative is to add it to the main list of deps where it isn't
 # needed.
 setuptools_rust = ">=1.3"
@@ -317,7 +324,7 @@ all = [
 # failing on new releases. Keeping lower bounds loose here means that dependabot
 # can bump versions without having to update the content-hash in the lockfile.
 # This helps prevents merge conflicts when running a batch of dependabot updates.
-ruff = "0.12.2"
+ruff = "0.12.7"
 # Type checking only works with the pydantic.v1 compat module from pydantic v2
 pydantic = "^2"
 
@@ -326,7 +333,6 @@ lxml-stubs = ">=0.4.0"
 mypy = "*"
 mypy-zope = "*"
 types-bleach = ">=4.1.0"
-types-commonmark = ">=0.9.2"
 types-jsonschema = ">=3.2.0"
 types-netaddr = ">=0.8.0.6"
 types-opentracing = ">=2.4.2"
@@ -349,7 +355,7 @@ idna = ">=2.5"
 click = ">=8.1.3"
 # GitPython was == 3.1.14; bumped to 3.1.20, the first release with type hints.
 GitPython = ">=3.1.20"
-commonmark = ">=0.9.1"
+markdown-it-py = ">=3.0.0"
 pygithub = ">=1.55"
 # The following are executed as commands by the release script.
 twine = "*"

rust/Cargo.toml

@@ -7,7 +7,7 @@ name = "synapse"
 version = "0.1.0"
 
 edition = "2021"
-rust-version = "1.81.0"
+rust-version = "1.82.0"
 
 [lib]
 name = "synapse"
@@ -23,7 +23,7 @@ name = "synapse.synapse_rust"
 
 [dependencies]
 anyhow = "1.0.63"
-base64 = "0.21.7"
+base64 = "0.22.1"
 bytes = "1.6.0"
 headers = "0.4.0"
 http = "1.1.0"
@@ -52,6 +52,7 @@ reqwest = { version = "0.12.15", default-features = false, features = [
 http-body-util = "0.1.3"
 futures = "0.3.31"
 tokio = { version = "1.44.2", features = ["rt", "rt-multi-thread"] }
+once_cell = "1.18.0"
 
 [features]
 extension-module = ["pyo3/extension-module"]

rust/benches/evaluator.rs

@@ -61,6 +61,7 @@ fn bench_match_exact(b: &mut Bencher) {
         vec![],
         false,
         false,
+        false,
     )
     .unwrap();
 
@@ -71,10 +72,10 @@ fn bench_match_exact(b: &mut Bencher) {
         },
     ));
 
-    let matched = eval.match_condition(&condition, None, None).unwrap();
+    let matched = eval.match_condition(&condition, None, None, None).unwrap();
     assert!(matched, "Didn't match");
 
-    b.iter(|| eval.match_condition(&condition, None, None).unwrap());
+    b.iter(|| eval.match_condition(&condition, None, None, None).unwrap());
 }
 
 #[bench]
@@ -107,6 +108,7 @@ fn bench_match_word(b: &mut Bencher) {
         vec![],
         false,
         false,
+        false,
     )
     .unwrap();
 
@@ -117,10 +119,10 @@ fn bench_match_word(b: &mut Bencher) {
         },
     ));
 
-    let matched = eval.match_condition(&condition, None, None).unwrap();
+    let matched = eval.match_condition(&condition, None, None, None).unwrap();
     assert!(matched, "Didn't match");
 
-    b.iter(|| eval.match_condition(&condition, None, None).unwrap());
+    b.iter(|| eval.match_condition(&condition, None, None, None).unwrap());
 }
 
 #[bench]
@@ -153,6 +155,7 @@ fn bench_match_word_miss(b: &mut Bencher) {
         vec![],
         false,
         false,
+        false,
     )
     .unwrap();
 
@@ -163,10 +166,10 @@ fn bench_match_word_miss(b: &mut Bencher) {
         },
     ));
 
-    let matched = eval.match_condition(&condition, None, None).unwrap();
+    let matched = eval.match_condition(&condition, None, None, None).unwrap();
     assert!(!matched, "Didn't match");
 
-    b.iter(|| eval.match_condition(&condition, None, None).unwrap());
+    b.iter(|| eval.match_condition(&condition, None, None, None).unwrap());
 }
 
 #[bench]
@@ -199,6 +202,7 @@ fn bench_eval_message(b: &mut Bencher) {
         vec![],
         false,
         false,
+        false,
     )
     .unwrap();
 
@@ -210,7 +214,8 @@ fn bench_eval_message(b: &mut Bencher) {
         false,
         false,
         false,
+        false,
     );
 
-    b.iter(|| eval.run(&rules, Some("bob"), Some("person")));
+    b.iter(|| eval.run(&rules, Some("bob"), Some("person"), None));
 }

rust/src/events/internal_metadata.rs

@@ -54,6 +54,7 @@ enum EventInternalMetadataData {
     RecheckRedaction(bool),
     SoftFailed(bool),
     ProactivelySend(bool),
+    PolicyServerSpammy(bool),
     Redacted(bool),
     TxnId(Box<str>),
     TokenId(i64),
@@ -96,6 +97,13 @@ impl EventInternalMetadataData {
                     .to_owned()
                     .into_any(),
             ),
+            EventInternalMetadataData::PolicyServerSpammy(o) => (
+                pyo3::intern!(py, "policy_server_spammy"),
+                o.into_pyobject(py)
+                    .unwrap_infallible()
+                    .to_owned()
+                    .into_any(),
+            ),
             EventInternalMetadataData::Redacted(o) => (
                 pyo3::intern!(py, "redacted"),
                 o.into_pyobject(py)
@@ -155,6 +163,11 @@ impl EventInternalMetadataData {
                     .extract()
                     .with_context(|| format!("'{key_str}' has invalid type"))?,
             ),
+            "policy_server_spammy" => EventInternalMetadataData::PolicyServerSpammy(
+                value
+                    .extract()
+                    .with_context(|| format!("'{key_str}' has invalid type"))?,
+            ),
             "redacted" => EventInternalMetadataData::Redacted(
                 value
                     .extract()
@@ -427,6 +440,17 @@ impl EventInternalMetadata {
         set_property!(self, ProactivelySend, obj);
     }
 
+    #[getter]
+    fn get_policy_server_spammy(&self) -> PyResult<bool> {
+        Ok(get_property_opt!(self, PolicyServerSpammy)
+            .copied()
+            .unwrap_or(false))
+    }
+    #[setter]
+    fn set_policy_server_spammy(&mut self, obj: bool) {
+        set_property!(self, PolicyServerSpammy, obj);
+    }
+
     #[getter]
     fn get_redacted(&self) -> PyResult<bool> {
         let bool = get_property!(self, Redacted)?;

rust/src/http_client.rs

@@ -12,58 +12,149 @@
  * <https://www.gnu.org/licenses/agpl-3.0.html>.
  */
 
-use std::{collections::HashMap, future::Future, panic::AssertUnwindSafe, sync::LazyLock};
+use std::{collections::HashMap, future::Future};
 
 use anyhow::Context;
-use futures::{FutureExt, TryStreamExt};
-use pyo3::{exceptions::PyException, prelude::*, types::PyString};
+use futures::TryStreamExt;
+use once_cell::sync::OnceCell;
+use pyo3::{create_exception, exceptions::PyException, prelude::*};
 use reqwest::RequestBuilder;
 use tokio::runtime::Runtime;
 
 use crate::errors::HttpResponseException;
 
-/// The tokio runtime that we're using to run async Rust libs.
-static RUNTIME: LazyLock<Runtime> = LazyLock::new(|| {
-    tokio::runtime::Builder::new_multi_thread()
-        .worker_threads(4)
-        .enable_all()
-        .build()
-        .unwrap()
-});
+create_exception!(
+    synapse.synapse_rust.http_client,
+    RustPanicError,
+    PyException,
+    "A panic which happened in a Rust future"
+);
 
-/// A reference to the `Deferred` python class.
-static DEFERRED_CLASS: LazyLock<PyObject> = LazyLock::new(|| {
-    Python::with_gil(|py| {
-        py.import("twisted.internet.defer")
-            .expect("module 'twisted.internet.defer' should be importable")
-            .getattr("Deferred")
-            .expect("module 'twisted.internet.defer' should have a 'Deferred' class")
-            .unbind()
-    })
-});
+impl RustPanicError {
+    fn from_panic(panic_err: &(dyn std::any::Any + Send + 'static)) -> PyErr {
+        // Apparently this is how you extract the panic message from a panic
+        let panic_message = if let Some(str_slice) = panic_err.downcast_ref::<&str>() {
+            str_slice
+        } else if let Some(string) = panic_err.downcast_ref::<String>() {
+            string
+        } else {
+            "unknown error"
+        };
+        Self::new_err(panic_message.to_owned())
+    }
+}
 
-/// A reference to the twisted `reactor`.
-static TWISTED_REACTOR: LazyLock<Py<PyModule>> = LazyLock::new(|| {
-    Python::with_gil(|py| {
-        py.import("twisted.internet.reactor")
-            .expect("module 'twisted.internet.reactor' should be importable")
-            .unbind()
-    })
-});
+/// This is the name of the attribute where we store the runtime on the reactor
+static TOKIO_RUNTIME_ATTR: &str = "__synapse_rust_tokio_runtime";
+
+/// A Python wrapper around a Tokio runtime.
+///
+/// This allows us to 'store' the runtime on the reactor instance, starting it
+/// when the reactor starts, and stopping it when the reactor shuts down.
+#[pyclass]
+struct PyTokioRuntime {
+    runtime: Option<Runtime>,
+}
+
+#[pymethods]
+impl PyTokioRuntime {
+    fn start(&mut self) -> PyResult<()> {
+        // TODO: allow customization of the runtime like the number of threads
+        let runtime = tokio::runtime::Builder::new_multi_thread()
+            .worker_threads(4)
+            .enable_all()
+            .build()?;
+
+        self.runtime = Some(runtime);
+
+        Ok(())
+    }
+
+    fn shutdown(&mut self) -> PyResult<()> {
+        let runtime = self
+            .runtime
+            .take()
+            .context("Runtime was already shutdown")?;
+
+        // Dropping the runtime will shut it down
+        drop(runtime);
+
+        Ok(())
+    }
+}
+
+impl PyTokioRuntime {
+    /// Get the handle to the Tokio runtime, if it is running.
+    fn handle(&self) -> PyResult<&tokio::runtime::Handle> {
+        let handle = self
+            .runtime
+            .as_ref()
+            .context("Tokio runtime is not running")?
+            .handle();
+
+        Ok(handle)
+    }
+}
+
+/// Get a handle to the Tokio runtime stored on the reactor instance, or create
+/// a new one.
+fn runtime<'a>(reactor: &Bound<'a, PyAny>) -> PyResult<PyRef<'a, PyTokioRuntime>> {
+    if !reactor.hasattr(TOKIO_RUNTIME_ATTR)? {
+        install_runtime(reactor)?;
+    }
+
+    get_runtime(reactor)
+}
+
+/// Install a new Tokio runtime on the reactor instance.
+fn install_runtime(reactor: &Bound<PyAny>) -> PyResult<()> {
+    let py = reactor.py();
+    let runtime = PyTokioRuntime { runtime: None };
+    let runtime = runtime.into_pyobject(py)?;
+
+    // Attach the runtime to the reactor, starting it when the reactor is
+    // running, stopping it when the reactor is shutting down
+    reactor.call_method1("callWhenRunning", (runtime.getattr("start")?,))?;
+    reactor.call_method1(
+        "addSystemEventTrigger",
+        ("after", "shutdown", runtime.getattr("shutdown")?),
+    )?;
+    reactor.setattr(TOKIO_RUNTIME_ATTR, runtime)?;
+
+    Ok(())
+}
+
+/// Get a reference to a Tokio runtime handle stored on the reactor instance.
+fn get_runtime<'a>(reactor: &Bound<'a, PyAny>) -> PyResult<PyRef<'a, PyTokioRuntime>> {
+    // This will raise if `TOKIO_RUNTIME_ATTR` is not set or if it is
+    // not a `Runtime`. Careful that this could happen if the user sets it
+    // manually, or if multiple versions of `pyo3-twisted` are used!
+    let runtime: Bound<PyTokioRuntime> = reactor.getattr(TOKIO_RUNTIME_ATTR)?.extract()?;
+    Ok(runtime.borrow())
+}
+
+/// A reference to the `twisted.internet.defer` module.
+static DEFER: OnceCell<PyObject> = OnceCell::new();
+
+/// Access to the `twisted.internet.defer` module.
+fn defer(py: Python<'_>) -> PyResult<&Bound<PyAny>> {
+    Ok(DEFER
+        .get_or_try_init(|| py.import("twisted.internet.defer").map(Into::into))?
+        .bind(py))
+}
 
 /// Called when registering modules with python.
 pub fn register_module(py: Python<'_>, m: &Bound<'_, PyModule>) -> PyResult<()> {
     let child_module: Bound<'_, PyModule> = PyModule::new(py, "http_client")?;
     child_module.add_class::<HttpClient>()?;
 
-    // Make sure we fail early if we can't build the lazy statics.
-    LazyLock::force(&RUNTIME);
-    LazyLock::force(&DEFERRED_CLASS);
+    // Make sure we fail early if we can't load some modules
+    defer(py)?;
 
     m.add_submodule(&child_module)?;
 
     // We need to manually add the module to sys.modules to make `from
-    // synapse.synapse_rust import acl` work.
+    // synapse.synapse_rust import http_client` work.
     py.import("sys")?
         .getattr("modules")?
         .set_item("synapse.synapse_rust.http_client", child_module)?;
@@ -72,26 +163,24 @@ pub fn register_module(py: Python<'_>, m: &Bound<'_, PyModule>) -> PyResult<()>
 }
 
 #[pyclass]
-#[derive(Clone)]
 struct HttpClient {
     client: reqwest::Client,
+    reactor: PyObject,
 }
 
 #[pymethods]
 impl HttpClient {
     #[new]
-    pub fn py_new(user_agent: &str) -> PyResult<HttpClient> {
-        // The twisted reactor can only be imported after Synapse has been
-        // imported, to allow Synapse to change the twisted reactor. If we try
-        // and import the reactor too early twisted installs a default reactor,
-        // which can't be replaced.
-        LazyLock::force(&TWISTED_REACTOR);
+    pub fn py_new(reactor: Bound<PyAny>, user_agent: &str) -> PyResult<HttpClient> {
+        // Make sure the runtime gets installed
+        let _ = runtime(&reactor)?;
 
         Ok(HttpClient {
             client: reqwest::Client::builder()
                 .user_agent(user_agent)
                 .build()
                 .context("building reqwest client")?,
+            reactor: reactor.unbind(),
         })
     }
 
@@ -129,7 +218,7 @@ impl HttpClient {
         builder: RequestBuilder,
         response_limit: usize,
     ) -> PyResult<Bound<'a, PyAny>> {
-        create_deferred(py, async move {
+        create_deferred(py, self.reactor.bind(py), async move {
             let response = builder.send().await.context("sending request")?;
 
             let status = response.status();
@@ -159,43 +248,51 @@ impl HttpClient {
 /// tokio runtime.
 ///
 /// Does not handle deferred cancellation or contextvars.
-fn create_deferred<F, O>(py: Python, fut: F) -> PyResult<Bound<'_, PyAny>>
+fn create_deferred<'py, F, O>(
+    py: Python<'py>,
+    reactor: &Bound<'py, PyAny>,
+    fut: F,
+) -> PyResult<Bound<'py, PyAny>>
 where
     F: Future<Output = PyResult<O>> + Send + 'static,
-    for<'a> O: IntoPyObject<'a>,
+    for<'a> O: IntoPyObject<'a> + Send + 'static,
 {
-    let deferred = DEFERRED_CLASS.bind(py).call0()?;
+    let deferred = defer(py)?.call_method0("Deferred")?;
     let deferred_callback = deferred.getattr("callback")?.unbind();
     let deferred_errback = deferred.getattr("errback")?.unbind();
 
-    RUNTIME.spawn(async move {
-        // TODO: Is it safe to assert unwind safety here? I think so, as we
-        // don't use anything that could be tainted by the panic afterwards.
-        // Note that `.spawn(..)` asserts unwind safety on the future too.
-        let res = AssertUnwindSafe(fut).catch_unwind().await;
+    let rt = runtime(reactor)?;
+    let handle = rt.handle()?;
+    let task = handle.spawn(fut);
+
+    // Unbind the reactor so that we can pass it to the task
+    let reactor = reactor.clone().unbind();
+    handle.spawn(async move {
+        let res = task.await;
 
         Python::with_gil(move |py| {
             // Flatten the panic into standard python error
             let res = match res {
                 Ok(r) => r,
-                Err(panic_err) => {
-                    let panic_message = get_panic_message(&panic_err);
-                    Err(PyException::new_err(
-                        PyString::new(py, panic_message).unbind(),
-                    ))
-                }
+                Err(join_err) => match join_err.try_into_panic() {
+                    Ok(panic_err) => Err(RustPanicError::from_panic(&panic_err)),
+                    Err(err) => Err(PyException::new_err(format!("Task cancelled: {err}"))),
+                },
             };
 
+            // Re-bind the reactor
+            let reactor = reactor.bind(py);
+
             // Send the result to the deferred, via `.callback(..)` or `.errback(..)`
             match res {
                 Ok(obj) => {
-                    TWISTED_REACTOR
-                        .call_method(py, "callFromThread", (deferred_callback, obj), None)
+                    reactor
+                        .call_method("callFromThread", (deferred_callback, obj), None)
                         .expect("callFromThread should not fail"); // There's nothing we can really do with errors here
                 }
                 Err(err) => {
-                    TWISTED_REACTOR
-                        .call_method(py, "callFromThread", (deferred_errback, err), None)
+                    reactor
+                        .call_method("callFromThread", (deferred_errback, err), None)
                         .expect("callFromThread should not fail"); // There's nothing we can really do with errors here
                 }
             }
@@ -204,15 +301,3 @@ where
 
     Ok(deferred)
 }
-
-/// Try and get the panic message out of the panic
-fn get_panic_message<'a>(panic_err: &'a (dyn std::any::Any + Send + 'static)) -> &'a str {
-    // Apparently this is how you extract the panic message from a panic
-    if let Some(str_slice) = panic_err.downcast_ref::<&str>() {
-        str_slice
-    } else if let Some(string) = panic_err.downcast_ref::<String>() {
-        string
-    } else {
-        "unknown error"
-    }
-}

rust/src/push/base_rules.rs

@@ -290,6 +290,26 @@ pub const BASE_APPEND_CONTENT_RULES: &[PushRule] = &[PushRule {
 }];
 
 pub const BASE_APPEND_UNDERRIDE_RULES: &[PushRule] = &[
+    PushRule {
+        rule_id: Cow::Borrowed("global/content/.io.element.msc4306.rule.unsubscribed_thread"),
+        priority_class: 1,
+        conditions: Cow::Borrowed(&[Condition::Known(
+            KnownCondition::Msc4306ThreadSubscription { subscribed: false },
+        )]),
+        actions: Cow::Borrowed(&[]),
+        default: true,
+        default_enabled: true,
+    },
+    PushRule {
+        rule_id: Cow::Borrowed("global/content/.io.element.msc4306.rule.subscribed_thread"),
+        priority_class: 1,
+        conditions: Cow::Borrowed(&[Condition::Known(
+            KnownCondition::Msc4306ThreadSubscription { subscribed: true },
+        )]),
+        actions: Cow::Borrowed(&[Action::Notify, SOUND_ACTION]),
+        default: true,
+        default_enabled: true,
+    },
     PushRule {
         rule_id: Cow::Borrowed("global/underride/.m.rule.call"),
         priority_class: 1,

rust/src/push/evaluator.rs

@@ -106,8 +106,11 @@ pub struct PushRuleEvaluator {
     /// flag as MSC1767 (extensible events core).
     msc3931_enabled: bool,
 
-    // If MSC4210 (remove legacy mentions) is enabled.
+    /// If MSC4210 (remove legacy mentions) is enabled.
     msc4210_enabled: bool,
+
+    /// If MSC4306 (thread subscriptions) is enabled.
+    msc4306_enabled: bool,
 }
 
 #[pymethods]
@@ -126,6 +129,7 @@ impl PushRuleEvaluator {
         room_version_feature_flags,
         msc3931_enabled,
         msc4210_enabled,
+        msc4306_enabled,
     ))]
     pub fn py_new(
         flattened_keys: BTreeMap<String, JsonValue>,
@@ -138,6 +142,7 @@ impl PushRuleEvaluator {
         room_version_feature_flags: Vec<String>,
         msc3931_enabled: bool,
         msc4210_enabled: bool,
+        msc4306_enabled: bool,
     ) -> Result<Self, Error> {
         let body = match flattened_keys.get("content.body") {
             Some(JsonValue::Value(SimpleJsonValue::Str(s))) => s.clone().into_owned(),
@@ -156,6 +161,7 @@ impl PushRuleEvaluator {
             room_version_feature_flags,
             msc3931_enabled,
             msc4210_enabled,
+            msc4306_enabled,
         })
     }
 
@@ -167,12 +173,19 @@ impl PushRuleEvaluator {
     ///
     /// Returns the set of actions, if any, that match (filtering out any
     /// `dont_notify` and `coalesce` actions).
-    #[pyo3(signature = (push_rules, user_id=None, display_name=None))]
+    ///
+    /// msc4306_thread_subscription_state: (Only populated if MSC4306 is enabled)
+    /// The thread subscription state corresponding to the thread containing this event.
+    /// - `None` if the event is not in a thread, or if MSC4306 is disabled.
+    /// - `Some(true)` if the event is in a thread and the user has a subscription for that thread
+    /// - `Some(false)` if the event is in a thread and the user does NOT have a subscription for that thread
+    #[pyo3(signature = (push_rules, user_id=None, display_name=None, msc4306_thread_subscription_state=None))]
     pub fn run(
         &self,
         push_rules: &FilteredPushRules,
         user_id: Option<&str>,
         display_name: Option<&str>,
+        msc4306_thread_subscription_state: Option<bool>,
     ) -> Vec<Action> {
         'outer: for (push_rule, enabled) in push_rules.iter() {
             if !enabled {
@@ -204,7 +217,12 @@ impl PushRuleEvaluator {
                     Condition::Known(KnownCondition::RoomVersionSupports { feature: _ }),
                 );
 
-                match self.match_condition(condition, user_id, display_name) {
+                match self.match_condition(
+                    condition,
+                    user_id,
+                    display_name,
+                    msc4306_thread_subscription_state,
+                ) {
                     Ok(true) => {}
                     Ok(false) => continue 'outer,
                     Err(err) => {
@@ -237,14 +255,20 @@ impl PushRuleEvaluator {
     }
 
     /// Check if the given condition matches.
-    #[pyo3(signature = (condition, user_id=None, display_name=None))]
+    #[pyo3(signature = (condition, user_id=None, display_name=None, msc4306_thread_subscription_state=None))]
     fn matches(
         &self,
         condition: Condition,
         user_id: Option<&str>,
         display_name: Option<&str>,
+        msc4306_thread_subscription_state: Option<bool>,
     ) -> bool {
-        match self.match_condition(&condition, user_id, display_name) {
+        match self.match_condition(
+            &condition,
+            user_id,
+            display_name,
+            msc4306_thread_subscription_state,
+        ) {
             Ok(true) => true,
             Ok(false) => false,
             Err(err) => {
@@ -262,6 +286,7 @@ impl PushRuleEvaluator {
         condition: &Condition,
         user_id: Option<&str>,
         display_name: Option<&str>,
+        msc4306_thread_subscription_state: Option<bool>,
     ) -> Result<bool, Error> {
         let known_condition = match condition {
             Condition::Known(known) => known,
@@ -393,6 +418,13 @@ impl PushRuleEvaluator {
                         && self.room_version_feature_flags.contains(&flag)
                 }
             }
+            KnownCondition::Msc4306ThreadSubscription { subscribed } => {
+                if !self.msc4306_enabled {
+                    false
+                } else {
+                    msc4306_thread_subscription_state == Some(*subscribed)
+                }
+            }
         };
 
         Ok(result)
@@ -536,10 +568,11 @@ fn push_rule_evaluator() {
         vec![],
         true,
         false,
+        false,
     )
     .unwrap();
 
-    let result = evaluator.run(&FilteredPushRules::default(), None, Some("bob"));
+    let result = evaluator.run(&FilteredPushRules::default(), None, Some("bob"), None);
     assert_eq!(result.len(), 3);
 }
 
@@ -566,6 +599,7 @@ fn test_requires_room_version_supports_condition() {
         flags,
         true,
         false,
+        false,
     )
     .unwrap();
 
@@ -575,6 +609,7 @@ fn test_requires_room_version_supports_condition() {
         &FilteredPushRules::default(),
         Some("@bob:example.org"),
         None,
+        None,
     );
     assert_eq!(result.len(), 3);
 
@@ -593,7 +628,17 @@ fn test_requires_room_version_supports_condition() {
     };
     let rules = PushRules::new(vec![custom_rule]);
     result = evaluator.run(
-        &FilteredPushRules::py_new(rules, BTreeMap::new(), true, false, true, false, false),
+        &FilteredPushRules::py_new(
+            rules,
+            BTreeMap::new(),
+            true,
+            false,
+            true,
+            false,
+            false,
+            false,
+        ),
+        None,
         None,
         None,
     );

rust/src/push/mod.rs

@@ -369,6 +369,10 @@ pub enum KnownCondition {
     RoomVersionSupports {
         feature: Cow<'static, str>,
     },
+    #[serde(rename = "io.element.msc4306.thread_subscription")]
+    Msc4306ThreadSubscription {
+        subscribed: bool,
+    },
 }
 
 impl<'source> IntoPyObject<'source> for Condition {
@@ -547,11 +551,13 @@ pub struct FilteredPushRules {
     msc3664_enabled: bool,
     msc4028_push_encrypted_events: bool,
     msc4210_enabled: bool,
+    msc4306_enabled: bool,
 }
 
 #[pymethods]
 impl FilteredPushRules {
     #[new]
+    #[allow(clippy::too_many_arguments)]
     pub fn py_new(
         push_rules: PushRules,
         enabled_map: BTreeMap<String, bool>,
@@ -560,6 +566,7 @@ impl FilteredPushRules {
         msc3664_enabled: bool,
         msc4028_push_encrypted_events: bool,
         msc4210_enabled: bool,
+        msc4306_enabled: bool,
     ) -> Self {
         Self {
             push_rules,
@@ -569,6 +576,7 @@ impl FilteredPushRules {
             msc3664_enabled,
             msc4028_push_encrypted_events,
             msc4210_enabled,
+            msc4306_enabled,
         }
     }
 
@@ -619,6 +627,10 @@ impl FilteredPushRules {
                     return false;
                 }
 
+                if !self.msc4306_enabled && rule.rule_id.contains("/.io.element.msc4306.rule.") {
+                    return false;
+                }
+
                 true
             })
             .map(|r| {

schema/synapse-config.schema.yaml

@@ -1,5 +1,5 @@
 $schema: https://element-hq.github.io/synapse/latest/schema/v1/meta.schema.json
-$id: https://element-hq.github.io/synapse/schema/synapse/v1.134/synapse-config.schema.json
+$id: https://element-hq.github.io/synapse/schema/synapse/v1.137/synapse-config.schema.json
 type: object
 properties:
   modules:
@@ -629,6 +629,70 @@ properties:
         password: mypassword
         ssh_priv_key_path: CONFDIR/id_rsa
         ssh_pub_key_path: CONFDIR/id_rsa.pub
+  http_proxy:
+    type: ["string", "null"]
+    description: >-
+      Proxy server to use for HTTP requests.
+
+      For more details, see the [forward proxy documentation](../../setup/forward_proxy.md).
+    examples:
+      - "http://USERNAME:PASSWORD@10.0.1.1:8080/"
+  https_proxy:
+    type: ["string", "null"]
+    description: >-
+      Proxy server to use for HTTPS requests.
+
+      For more details, see the [forward proxy documentation](../../setup/forward_proxy.md).
+    examples:
+      - "http://USERNAME:PASSWORD@proxy.example.com:8080/"
+  no_proxy_hosts:
+    type: array
+    description: >-
+      List of hosts, IP addresses, or IP ranges in CIDR format which should not use the
+      proxy. Synapse will directly connect to these hosts.
+
+      For more details, see the [forward proxy documentation](../../setup/forward_proxy.md).
+    examples:
+      - - master.hostname.example.com
+        - 10.1.0.0/16
+        - 172.30.0.0/16
+  matrix_authentication_service:
+    type: object
+    description: >-
+      The `matrix_authentication_service` setting configures integration with
+      [Matrix Authentication Service (MAS)](https://github.com/element-hq/matrix-authentication-service).
+    properties:
+      enabled:
+        type: boolean
+        description: >-
+          Whether or not to enable the MAS integration. If this is set to
+          `false`, Synapse will use its legacy internal authentication API.
+        default: false
+
+      endpoint:
+        type: string
+        format: uri
+        description: >-
+          The URL where Synapse can reach MAS. This *must* have the `discovery`
+          and `oauth` resources mounted.
+        default: http://localhost:8080
+
+      secret:
+        type: ["string", "null"]
+        description: >-
+          A shared secret that will be used to authenticate requests from and to MAS.
+
+      secret_path:
+        type: ["string", "null"]
+        description: >-
+          Alternative to `secret`, reading the shared secret from a file.
+          The file should be a plain text file, containing only the secret.
+          Synapse reads the secret from the given file once at startup.
+
+    examples:
+      - enabled: true
+        secret: someverysecuresecret
+        endpoint: http://localhost:8080
   dummy_events_threshold:
     type: integer
     description: >-
@@ -2179,9 +2243,8 @@ properties:
       with a short timeout, or restarting several different delayed events all
       at once) without the risk of being ratelimited.
     default:
-      per_user:
-        per_second: 1.0
-        burst_count: 5.0
+      per_second: 1.0
+      burst_count: 5.0
     examples:
       - per_second: 2.0
         burst_count: 20.0
@@ -2202,6 +2265,17 @@ properties:
     examples:
       - per_second: 2.0
         burst_count: 20.0
+  rc_room_creation:
+    $ref: "#/$defs/rc"
+    description: >-
+      Sets rate limits for how often users are able to create rooms.
+    default:
+      per_user:
+        per_second: 0.016
+        burst_count: 10.0
+    examples:
+      - per_second: 1.0
+        burst_count: 5.0
   federation_rr_transactions_per_room_per_second:
     type: integer
     description: >-
@@ -2335,6 +2409,30 @@ properties:
     default: 50M
     examples:
       - 60M
+  media_upload_limits:
+    type: array
+    description: >-
+      A list of media upload limits defining how much data a given user can
+      upload in a given time period.
+
+
+      An empty list means no limits are applied.
+    default: []
+    items:
+      time_period:
+        type: "#/$defs/duration"
+        description: >-
+          The time period over which the limit applies. Required.
+      max_size:
+        type: "#/$defs/bytes"
+        description: >-
+          Amount of data that can be uploaded in the time period by the user.
+          Required.
+    examples:
+      - - time_period: 1h
+          max_size: 100M
+        - time_period: 1w
+          max_size: 500M
   max_image_pixels:
     $ref: "#/$defs/bytes"
     description: Maximum number of pixels that will be thumbnailed.
@@ -2668,6 +2766,21 @@ properties:
     default: null
     examples:
       - YOUR_PUBLIC_KEY
+  recaptcha_public_key_path:
+    type: ["string", "null"]
+    description: >-
+      An alternative to [`recaptcha_public_key`](#recaptcha_public_key): allows
+      the public key to be specified in an external file.
+
+
+      The file should be a plain text file, containing only the public key.
+      Synapse reads the public key from the given file once at startup.
+
+
+      _Added in Synapse 1.135.0._
+    default: null
+    examples:
+      - /path/to/key/file
   recaptcha_private_key:
     type: ["string", "null"]
     description: >-
@@ -2676,6 +2789,21 @@ properties:
     default: null
     examples:
       - YOUR_PRIVATE_KEY
+  recaptcha_private_key_path:
+    type: ["string", "null"]
+    description: >-
+      An alternative to [`recaptcha_private_key`](#recaptcha_private_key):
+      allows the private key to be specified in an external file.
+
+
+      The file should be a plain text file, containing only the private key.
+      Synapse reads the private key from the given file once at startup.
+
+
+      _Added in Synapse 1.135.0._
+    default: null
+    examples:
+      - /path/to/key/file
   enable_registration_captcha:
     type: boolean
     description: >-
@@ -4665,8 +4793,15 @@ properties:
       enabled:
         type: boolean
         description: >-
-          Defines whether users can search the user directory. If false then
+          Defines whether users can search the user directory. If `false` then
           empty responses are returned to all queries.
+
+
+          *Warning: While the homeserver may determine which subset of users are
+          searched, the Matrix specification requires homeservers to include (at
+          minimum) users visible in public rooms and users sharing a room with
+          the requester. Using `false` improves performance but violates this
+          requirement.*
         default: true
       search_all_users:
         type: boolean
@@ -5049,7 +5184,7 @@ properties:
 
       "m.room.avatar": 50
 
-      "m.room.tombstone": 100
+      "m.room.tombstone": 100 (150 if MSC4289 is used)
 
       "m.room.server_acl": 100
 
@@ -5323,6 +5458,9 @@ properties:
       push_rules:
         type: string
         description: Name of a worker assigned to the `push_rules` stream.
+      device_lists:
+        type: string
+        description: Name of a worker assigned to the `device_lists` stream.
     default: {}
     examples:
       - events: worker1

scripts-dev/gen_config_documentation.py

@@ -473,6 +473,10 @@ def section(prop: str, values: dict) -> str:
 
 
 def main() -> None:
+    # For Windows: reconfigure the terminal to be UTF-8 for `print()` calls.
+    if sys.platform == "win32":
+        sys.stdout.reconfigure(encoding="utf-8")
+
     def usage(err_msg: str) -> int:
         script_name = (sys.argv[:1] or ["__main__.py"])[0]
         print(err_msg, file=sys.stderr)
@@ -485,7 +489,10 @@ def main() -> None:
             exit(usage("Too many arguments."))
         if not (filepath := (sys.argv[1:] or [""])[0]):
             exit(usage("No schema file provided."))
-        with open(filepath) as f:
+        with open(filepath, "r", encoding="utf-8") as f:
+            # Note: Windows requires that we specify the encoding otherwise it uses
+            # things like CP-1251, which can cause explosions.
+            # See https://github.com/yaml/pyyaml/issues/123 for more info.
             return yaml.safe_load(f)
 
     schema = read_json_file_arg()

scripts-dev/mypy_synapse_plugin.py

@@ -23,28 +23,195 @@
 can crop up, e.g the cache descriptors.
 """
 
-from typing import Callable, Optional, Tuple, Type, Union
+import enum
+from typing import Callable, Mapping, Optional, Tuple, Type, Union
 
+import attr
 import mypy.types
 from mypy.erasetype import remove_instance_last_known_values
 from mypy.errorcodes import ErrorCode
-from mypy.nodes import ARG_NAMED_OPT, TempNode, Var
-from mypy.plugin import FunctionSigContext, MethodSigContext, Plugin
+from mypy.nodes import ARG_NAMED_OPT, ListExpr, NameExpr, TempNode, TupleExpr, Var
+from mypy.plugin import (
+    ClassDefContext,
+    Context,
+    FunctionLike,
+    FunctionSigContext,
+    MethodSigContext,
+    MypyFile,
+    Plugin,
+)
 from mypy.typeops import bind_self
 from mypy.types import (
     AnyType,
     CallableType,
     Instance,
     NoneType,
+    Options,
     TupleType,
     TypeAliasType,
     TypeVarType,
     UninhabitedType,
     UnionType,
 )
+from mypy_zope import plugin as mypy_zope_plugin
+from pydantic.mypy import plugin as mypy_pydantic_plugin
+
+PROMETHEUS_METRIC_MISSING_SERVER_NAME_LABEL = ErrorCode(
+    "missing-server-name-label",
+    "`SERVER_NAME_LABEL` required in metric",
+    category="per-homeserver-tenant-metrics",
+)
+
+PROMETHEUS_METRIC_MISSING_FROM_LIST_TO_CHECK = ErrorCode(
+    "metric-type-missing-from-list",
+    "Every Prometheus metric type must be included in the `prometheus_metric_fullname_to_label_arg_map`.",
+    category="per-homeserver-tenant-metrics",
+)
+
+
+class Sentinel(enum.Enum):
+    # defining a sentinel in this way allows mypy to correctly handle the
+    # type of a dictionary lookup and subsequent type narrowing.
+    UNSET_SENTINEL = object()
+
+
+@attr.s(auto_attribs=True)
+class ArgLocation:
+    keyword_name: str
+    """
+    The keyword argument name for this argument
+    """
+    position: int
+    """
+    The 0-based positional index of this argument
+    """
+
+
+prometheus_metric_fullname_to_label_arg_map: Mapping[str, Optional[ArgLocation]] = {
+    # `Collector` subclasses:
+    "prometheus_client.metrics.MetricWrapperBase": ArgLocation("labelnames", 2),
+    "prometheus_client.metrics.Counter": ArgLocation("labelnames", 2),
+    "prometheus_client.metrics.Histogram": ArgLocation("labelnames", 2),
+    "prometheus_client.metrics.Gauge": ArgLocation("labelnames", 2),
+    "prometheus_client.metrics.Summary": ArgLocation("labelnames", 2),
+    "prometheus_client.metrics.Info": ArgLocation("labelnames", 2),
+    "prometheus_client.metrics.Enum": ArgLocation("labelnames", 2),
+    "synapse.metrics.LaterGauge": ArgLocation("labelnames", 2),
+    "synapse.metrics.InFlightGauge": ArgLocation("labels", 2),
+    "synapse.metrics.GaugeBucketCollector": ArgLocation("labelnames", 2),
+    "prometheus_client.registry.Collector": None,
+    "prometheus_client.registry._EmptyCollector": None,
+    "prometheus_client.registry.CollectorRegistry": None,
+    "prometheus_client.process_collector.ProcessCollector": None,
+    "prometheus_client.platform_collector.PlatformCollector": None,
+    "prometheus_client.gc_collector.GCCollector": None,
+    "synapse.metrics._gc.GCCounts": None,
+    "synapse.metrics._gc.PyPyGCStats": None,
+    "synapse.metrics._reactor_metrics.ReactorLastSeenMetric": None,
+    "synapse.metrics.CPUMetrics": None,
+    "synapse.metrics.jemalloc.JemallocCollector": None,
+    "synapse.util.metrics.DynamicCollectorRegistry": None,
+    "synapse.metrics.background_process_metrics._Collector": None,
+    #
+    # `Metric` subclasses:
+    "prometheus_client.metrics_core.Metric": None,
+    "prometheus_client.metrics_core.UnknownMetricFamily": ArgLocation("labels", 3),
+    "prometheus_client.metrics_core.CounterMetricFamily": ArgLocation("labels", 3),
+    "prometheus_client.metrics_core.GaugeMetricFamily": ArgLocation("labels", 3),
+    "prometheus_client.metrics_core.SummaryMetricFamily": ArgLocation("labels", 3),
+    "prometheus_client.metrics_core.InfoMetricFamily": ArgLocation("labels", 3),
+    "prometheus_client.metrics_core.HistogramMetricFamily": ArgLocation("labels", 3),
+    "prometheus_client.metrics_core.GaugeHistogramMetricFamily": ArgLocation(
+        "labels", 4
+    ),
+    "prometheus_client.metrics_core.StateSetMetricFamily": ArgLocation("labels", 3),
+    "synapse.metrics.GaugeHistogramMetricFamilyWithLabels": ArgLocation(
+        "labelnames", 4
+    ),
+}
+"""
+Map from the fullname of the Prometheus `Metric`/`Collector` classes to the keyword
+argument name and positional index of the label names. This map is useful because
+different metrics have different signatures for passing in label names and we just need
+to know where to look.
+
+This map should include any metrics that we collect with Prometheus. Which corresponds
+to anything that inherits from `prometheus_client.registry.Collector`
+(`synapse.metrics._types.Collector`) or `prometheus_client.metrics_core.Metric`. The
+exhaustiveness of this list is enforced by `analyze_prometheus_metric_classes`.
+
+The entries with `None` always fail the lint because they don't have a `labelnames`
+argument (therefore, no `SERVER_NAME_LABEL`), but we include them here so that people
+can notice and manually allow via a type ignore comment as the source of truth
+should be in the source code.
+"""
+
+# Unbound at this point because we don't know the mypy version yet.
+# This is set in the `plugin(...)` function below.
+MypyPydanticPluginClass: Type[Plugin]
+MypyZopePluginClass: Type[Plugin]
 
 
 class SynapsePlugin(Plugin):
+    def __init__(self, options: Options):
+        super().__init__(options)
+        self.mypy_pydantic_plugin = MypyPydanticPluginClass(options)
+        self.mypy_zope_plugin = MypyZopePluginClass(options)
+
+    def set_modules(self, modules: dict[str, MypyFile]) -> None:
+        """
+        This is called by mypy internals. We have to override this to ensure it's also
+        called for any other plugins that we're manually handling.
+
+        Here is how mypy describes it:
+
+        > [`self._modules`] can't be set in `__init__` because it is executed too soon
+        > in `build.py`. Therefore, `build.py` *must* set it later before graph processing
+        > starts by calling `set_modules()`.
+        """
+        super().set_modules(modules)
+        self.mypy_pydantic_plugin.set_modules(modules)
+        self.mypy_zope_plugin.set_modules(modules)
+
+    def get_base_class_hook(
+        self, fullname: str
+    ) -> Optional[Callable[[ClassDefContext], None]]:
+        def _get_base_class_hook(ctx: ClassDefContext) -> None:
+            # Run any `get_base_class_hook` checks from other plugins first.
+            #
+            # Unfortunately, because mypy only chooses the first plugin that returns a
+            # non-None value (known-limitation, c.f.
+            # https://github.com/python/mypy/issues/19524), we workaround this by
+            # putting our custom plugin first in the plugin order and then calling the
+            # other plugin's hook manually followed by our own checks.
+            if callback := self.mypy_pydantic_plugin.get_base_class_hook(fullname):
+                callback(ctx)
+            if callback := self.mypy_zope_plugin.get_base_class_hook(fullname):
+                callback(ctx)
+
+            # Now run our own checks
+            analyze_prometheus_metric_classes(ctx)
+
+        return _get_base_class_hook
+
+    def get_function_signature_hook(
+        self, fullname: str
+    ) -> Optional[Callable[[FunctionSigContext], FunctionLike]]:
+        # Strip off the unique identifier for classes that are dynamically created inside
+        # functions. ex. `synapse.metrics.jemalloc.JemallocCollector@185` (this is the line
+        # number)
+        if "@" in fullname:
+            fullname = fullname.split("@", 1)[0]
+
+        # Look for any Prometheus metrics to make sure they have the `SERVER_NAME_LABEL`
+        # label.
+        if fullname in prometheus_metric_fullname_to_label_arg_map.keys():
+            # Because it's difficult to determine the `fullname` of the function in the
+            # callback, let's just pass it in while we have it.
+            return lambda ctx: check_prometheus_metric_instantiation(ctx, fullname)
+
+        return None
+
     def get_method_signature_hook(
         self, fullname: str
     ) -> Optional[Callable[[MethodSigContext], CallableType]]:
@@ -65,6 +232,157 @@ class SynapsePlugin(Plugin):
         return None
 
 
+def analyze_prometheus_metric_classes(ctx: ClassDefContext) -> None:
+    """
+    Cross-check the list of Prometheus metric classes against the
+    `prometheus_metric_fullname_to_label_arg_map` to ensure the list is exhaustive and
+    up-to-date.
+    """
+
+    fullname = ctx.cls.fullname
+    # Strip off the unique identifier for classes that are dynamically created inside
+    # functions. ex. `synapse.metrics.jemalloc.JemallocCollector@185` (this is the line
+    # number)
+    if "@" in fullname:
+        fullname = fullname.split("@", 1)[0]
+
+    if any(
+        ancestor_type.fullname
+        in (
+            # All of the Prometheus metric classes inherit from the `Collector`.
+            "prometheus_client.registry.Collector",
+            "synapse.metrics._types.Collector",
+            # And custom metrics that inherit from `Metric`.
+            "prometheus_client.metrics_core.Metric",
+        )
+        for ancestor_type in ctx.cls.info.mro
+    ):
+        if fullname not in prometheus_metric_fullname_to_label_arg_map:
+            ctx.api.fail(
+                f"Expected {fullname} to be in `prometheus_metric_fullname_to_label_arg_map`, "
+                f"but it was not found. This is a problem with our custom mypy plugin. "
+                f"Please add it to the map.",
+                Context(),
+                code=PROMETHEUS_METRIC_MISSING_FROM_LIST_TO_CHECK,
+            )
+
+
+def check_prometheus_metric_instantiation(
+    ctx: FunctionSigContext, fullname: str
+) -> CallableType:
+    """
+    Ensure that the `prometheus_client` metrics include the `SERVER_NAME_LABEL` label
+    when instantiated.
+
+    This is important because we support multiple Synapse instances running in the same
+    process, where all metrics share a single global `REGISTRY`. The `server_name` label
+    ensures metrics are correctly separated by homeserver.
+
+    There are also some metrics that apply at the process level, such as CPU usage,
+    Python garbage collection, and Twisted reactor tick time, which shouldn't have the
+    `SERVER_NAME_LABEL`. In those cases, use a type ignore comment to disable the
+    check, e.g. `# type: ignore[missing-server-name-label]`.
+
+    Args:
+        ctx: The `FunctionSigContext` from mypy.
+        fullname: The fully qualified name of the function being called,
+            e.g. `"prometheus_client.metrics.Counter"`
+    """
+    # The true signature, this isn't being modified so this is what will be returned.
+    signature = ctx.default_signature
+
+    # Find where the label names argument is in the function signature.
+    arg_location = prometheus_metric_fullname_to_label_arg_map.get(
+        fullname, Sentinel.UNSET_SENTINEL
+    )
+    assert arg_location is not Sentinel.UNSET_SENTINEL, (
+        f"Expected to find {fullname} in `prometheus_metric_fullname_to_label_arg_map`, "
+        f"but it was not found. This is a problem with our custom mypy plugin. "
+        f"Please add it to the map. Context: {ctx.context}"
+    )
+    # People should be using `# type: ignore[missing-server-name-label]` for
+    # process-level metrics that should not have the `SERVER_NAME_LABEL`.
+    if arg_location is None:
+        ctx.api.fail(
+            f"{signature.name} does not have a `labelnames`/`labels` argument "
+            "(if this is untrue, update `prometheus_metric_fullname_to_label_arg_map` "
+            "in our custom mypy plugin) and should probably have a type ignore comment, "
+            "e.g. `# type: ignore[missing-server-name-label]`. The reason we don't "
+            "automatically ignore this is the source of truth should be in the source code.",
+            ctx.context,
+            code=PROMETHEUS_METRIC_MISSING_SERVER_NAME_LABEL,
+        )
+        return signature
+
+    # Sanity check the arguments are still as expected in this version of
+    # `prometheus_client`. ex. `Counter(name, documentation, labelnames, ...)`
+    #
+    # `signature.arg_names` should be: ["name", "documentation", "labelnames", ...]
+    if (
+        len(signature.arg_names) < (arg_location.position + 1)
+        or signature.arg_names[arg_location.position] != arg_location.keyword_name
+    ):
+        ctx.api.fail(
+            f"Expected argument number {arg_location.position + 1} of {signature.name} to be `labelnames`/`labels`, "
+            f"but got {signature.arg_names[arg_location.position]}",
+            ctx.context,
+        )
+        return signature
+
+    # Ensure mypy is passing the correct number of arguments because we are doing some
+    # dirty indexing into `ctx.args` later on.
+    assert len(ctx.args) == len(signature.arg_names), (
+        f"Expected the list of arguments in the {signature.name} signature ({len(signature.arg_names)})"
+        f"to match the number of arguments from the function signature context ({len(ctx.args)})"
+    )
+
+    # Check if the `labelnames` argument includes `SERVER_NAME_LABEL`
+    #
+    # `ctx.args` should look like this:
+    # ```
+    # [
+    #     [StrExpr("name")],
+    #     [StrExpr("documentation")],
+    #     [ListExpr([StrExpr("label1"), StrExpr("label2")])]
+    #     ...
+    # ]
+    # ```
+    labelnames_arg_expression = (
+        ctx.args[arg_location.position][0]
+        if len(ctx.args[arg_location.position]) > 0
+        else None
+    )
+    if isinstance(labelnames_arg_expression, (ListExpr, TupleExpr)):
+        # Check if the `labelnames` argument includes the `server_name` label (`SERVER_NAME_LABEL`).
+        for labelname_expression in labelnames_arg_expression.items:
+            if (
+                isinstance(labelname_expression, NameExpr)
+                and labelname_expression.fullname == "synapse.metrics.SERVER_NAME_LABEL"
+            ):
+                # Found the `SERVER_NAME_LABEL`, all good!
+                break
+        else:
+            ctx.api.fail(
+                f"Expected {signature.name} to include `SERVER_NAME_LABEL` in the list of labels. "
+                "If this is a process-level metric (vs homeserver-level), use a type ignore comment "
+                "to disable this check.",
+                ctx.context,
+                code=PROMETHEUS_METRIC_MISSING_SERVER_NAME_LABEL,
+            )
+    else:
+        ctx.api.fail(
+            f"Expected the `labelnames` argument of {signature.name} to be a list of label names "
+            f"(including `SERVER_NAME_LABEL`), but got {labelnames_arg_expression}. "
+            "If this is a process-level metric (vs homeserver-level), use a type ignore comment "
+            "to disable this check.",
+            ctx.context,
+            code=PROMETHEUS_METRIC_MISSING_SERVER_NAME_LABEL,
+        )
+        return signature
+
+    return signature
+
+
 def _get_true_return_type(signature: CallableType) -> mypy.types.Type:
     """
     Get the "final" return type of a callable which might return an Awaitable/Deferred.
@@ -372,10 +690,13 @@ def is_cacheable(
 
 
 def plugin(version: str) -> Type[SynapsePlugin]:
+    global MypyPydanticPluginClass, MypyZopePluginClass
     # This is the entry point of the plugin, and lets us deal with the fact
     # that the mypy plugin interface is *not* stable by looking at the version
     # string.
     #
     # However, since we pin the version of mypy Synapse uses in CI, we don't
     # really care.
+    MypyPydanticPluginClass = mypy_pydantic_plugin(version)
+    MypyZopePluginClass = mypy_zope_plugin(version)
     return SynapsePlugin

scripts-dev/release.py

@@ -36,11 +36,11 @@ from typing import Any, List, Match, Optional, Union
 
 import attr
 import click
-import commonmark
 import git
 from click.exceptions import ClickException
 from git import GitCommandError, Repo
 from github import BadCredentialsException, Github
+from markdown_it import MarkdownIt
 from packaging import version
 
 
@@ -851,7 +851,7 @@ def get_changes_for_version(wanted_version: version.Version) -> str:
 
     # First we parse the changelog so that we can split it into sections based
     # on the release headings.
-    ast = commonmark.Parser().parse(changes)
+    tokens = MarkdownIt().parse(changes)
 
     @attr.s(auto_attribs=True)
     class VersionSection:
@@ -862,19 +862,22 @@ def get_changes_for_version(wanted_version: version.Version) -> str:
         end_line: Optional[int] = None  # Is none if its the last entry
 
     headings: List[VersionSection] = []
-    for node, _ in ast.walker():
-        # We look for all text nodes that are in a level 1 heading.
-        if node.t != "text":
+    for i, token in enumerate(tokens):
+        # We look for level 1 headings (h1 tags).
+        if token.type != "heading_open" or token.tag != "h1":
             continue
 
-        if node.parent.t != "heading" or node.parent.level != 1:
-            continue
+        # The next token should be an inline token containing the heading text
+        if i + 1 < len(tokens) and tokens[i + 1].type == "inline":
+            heading_text = tokens[i + 1].content
+            # The map property contains [line_begin, line_end] (0-based)
+            start_line = token.map[0] if token.map else 0
 
-        # If we have a previous heading then we update its `end_line`.
-        if headings:
-            headings[-1].end_line = node.parent.sourcepos[0][0] - 1
+            # If we have a previous heading then we update its `end_line`.
+            if headings:
+                headings[-1].end_line = start_line
 
-        headings.append(VersionSection(node.literal, node.parent.sourcepos[0][0] - 1))
+            headings.append(VersionSection(heading_text, start_line))
 
     changes_by_line = changes.split("\n")
 

synapse/__init__.py

@@ -45,16 +45,6 @@ if py_version < (3, 9):
 
 # Allow using the asyncio reactor via env var.
 if strtobool(os.environ.get("SYNAPSE_ASYNC_IO_REACTOR", "0")):
-    from incremental import Version
-
-    import twisted
-
-    # We need a bugfix that is included in Twisted 21.2.0:
-    # https://twistedmatrix.com/trac/ticket/9787
-    if twisted.version < Version("Twisted", 21, 2, 0):
-        print("Using asyncio reactor requires Twisted>=21.2.0")
-        sys.exit(1)
-
     import asyncio
 
     from twisted.internet import asyncioreactor

synapse/_pydantic_compat.py

@@ -34,9 +34,11 @@ HAS_PYDANTIC_V2: bool = Version(pydantic_version).major == 2
 
 if TYPE_CHECKING or HAS_PYDANTIC_V2:
     from pydantic.v1 import (
+        AnyHttpUrl,
         BaseModel,
         Extra,
         Field,
+        FilePath,
         MissingError,
         PydanticValueError,
         StrictBool,
@@ -48,15 +50,18 @@ if TYPE_CHECKING or HAS_PYDANTIC_V2:
         conint,
         constr,
         parse_obj_as,
+        root_validator,
         validator,
     )
     from pydantic.v1.error_wrappers import ErrorWrapper
     from pydantic.v1.typing import get_args
 else:
     from pydantic import (
+        AnyHttpUrl,
         BaseModel,
         Extra,
         Field,
+        FilePath,
         MissingError,
         PydanticValueError,
         StrictBool,
@@ -68,6 +73,7 @@ else:
         conint,
         constr,
         parse_obj_as,
+        root_validator,
         validator,
     )
     from pydantic.error_wrappers import ErrorWrapper
@@ -75,6 +81,7 @@ else:
 
 __all__ = (
     "HAS_PYDANTIC_V2",
+    "AnyHttpUrl",
     "BaseModel",
     "constr",
     "conbytes",
@@ -83,6 +90,7 @@ __all__ = (
     "ErrorWrapper",
     "Extra",
     "Field",
+    "FilePath",
     "get_args",
     "MissingError",
     "parse_obj_as",
@@ -92,4 +100,5 @@ __all__ = (
     "StrictStr",
     "ValidationError",
     "validator",
+    "root_validator",
 )

synapse/_scripts/register_new_matrix_user.py

@@ -30,6 +30,7 @@ from typing import Any, Callable, Dict, Optional
 
 import requests
 import yaml
+from typing_extensions import Never
 
 _CONFLICTING_SHARED_SECRET_OPTS_ERROR = """\
 Conflicting options 'registration_shared_secret' and 'registration_shared_secret_path'
@@ -40,6 +41,10 @@ _NO_SHARED_SECRET_OPTS_ERROR = """\
 No 'registration_shared_secret' or 'registration_shared_secret_path' defined in config.
 """
 
+_EMPTY_SHARED_SECRET_PATH_OPTS_ERROR = """\
+The secret given via `registration_shared_secret_path` must not be empty.
+"""
+
 _DEFAULT_SERVER_URL = "http://localhost:8008"
 
 
@@ -170,6 +175,12 @@ def register_new_user(
     )
 
 
+def bail(err_msg: str) -> Never:
+    """Prints the given message to stderr and exits."""
+    print(err_msg, file=sys.stderr)
+    sys.exit(1)
+
+
 def main() -> None:
     logging.captureWarnings(True)
 
@@ -262,15 +273,20 @@ def main() -> None:
         assert config is not None
 
         secret = config.get("registration_shared_secret")
+        if not isinstance(secret, (str, type(None))):
+            bail("registration_shared_secret is not a string.")
         secret_file = config.get("registration_shared_secret_path")
-        if secret_file:
-            if secret:
-                print(_CONFLICTING_SHARED_SECRET_OPTS_ERROR, file=sys.stderr)
-                sys.exit(1)
+        if not isinstance(secret_file, (str, type(None))):
+            bail("registration_shared_secret_path is not a string.")
+
+        if not secret and not secret_file:
+            bail(_NO_SHARED_SECRET_OPTS_ERROR)
+        elif secret and secret_file:
+            bail(_CONFLICTING_SHARED_SECRET_OPTS_ERROR)
+        elif not secret and secret_file:
             secret = _read_file(secret_file, "registration_shared_secret_path").strip()
-        if not secret:
-            print(_NO_SHARED_SECRET_OPTS_ERROR, file=sys.stderr)
-            sys.exit(1)
+            if not secret:
+                bail(_EMPTY_SHARED_SECRET_PATH_OPTS_ERROR)
 
     if args.password_file:
         password = _read_file(args.password_file, "password-file").strip()

synapse/_scripts/review_recent_signups.py

@@ -29,19 +29,21 @@ import attr
 
 from synapse.config._base import (
     Config,
+    ConfigError,
     RootConfig,
     find_config_files,
     read_config_files,
 )
 from synapse.config.database import DatabaseConfig
+from synapse.config.server import ServerConfig
 from synapse.storage.database import DatabasePool, LoggingTransaction, make_conn
 from synapse.storage.engines import create_engine
 
 
 class ReviewConfig(RootConfig):
-    "A config class that just pulls out the database config"
+    "A config class that just pulls out the server and database config"
 
-    config_classes = [DatabaseConfig]
+    config_classes = [ServerConfig, DatabaseConfig]
 
 
 @attr.s(auto_attribs=True)
@@ -148,6 +150,10 @@ def main() -> None:
     config_dict = read_config_files(config_files)
     config.parse_config_dict(config_dict, "", "")
 
+    server_name = config.server.server_name
+    if not isinstance(server_name, str):
+        raise ConfigError("Must be a string", ("server_name",))
+
     since_ms = time.time() * 1000 - Config.parse_duration(config_args.since)
     exclude_users_with_email = config_args.exclude_emails
     exclude_users_with_appservice = config_args.exclude_app_service
@@ -159,7 +165,12 @@ def main() -> None:
 
     engine = create_engine(database_config.config)
 
-    with make_conn(database_config, engine, "review_recent_signups") as db_conn:
+    with make_conn(
+        db_config=database_config,
+        engine=engine,
+        default_txn_name="review_recent_signups",
+        server_name=server_name,
+    ) as db_conn:
         # This generates a type of Cursor, not LoggingTransaction.
         user_infos = get_recent_users(
             db_conn.cursor(),

synapse/_scripts/synapse_port_db.py

@@ -136,6 +136,7 @@ BOOLEAN_COLUMNS = {
         "has_known_state",
         "is_encrypted",
     ],
+    "thread_subscriptions": ["subscribed", "automatic"],
     "users": ["shadow_banned", "approved", "locked", "suspended"],
     "un_partial_stated_event_stream": ["rejection_status_changed"],
     "users_who_share_rooms": ["share_private"],
@@ -190,13 +191,18 @@ APPEND_ONLY_TABLES = [
     "users",
 ]
 
+# These tables declare their id column with "PRIMARY KEY AUTOINCREMENT" on sqlite side
+# and with "PRIMARY KEY GENERATED ALWAYS AS IDENTITY" on postgres side. This creates an
+# implicit sequence that needs its value to be migrated separately. Additionally,
+# inserting on postgres side needs to use the "OVERRIDING SYSTEM VALUE" modifier.
+AUTOINCREMENT_TABLES = {
+    "sliding_sync_connections",
+    "sliding_sync_connection_positions",
+    "sliding_sync_connection_required_state",
+    "state_groups_pending_deletion",
+}
 
 IGNORED_TABLES = {
-    # Porting the auto generated sequence in this table is non-trivial.
-    # None of the entries in this list are mandatory for Synapse to keep working.
-    # If state group disk space is an issue after the port, the
-    # `mark_unreferenced_state_groups_for_deletion_bg_update` background task can be run again.
-    "state_groups_pending_deletion",
     # We don't port these tables, as they're a faff and we can regenerate
     # them anyway.
     "user_directory",
@@ -284,11 +290,17 @@ class Store(
         return self.db_pool.runInteraction("execute_sql", r)
 
     def insert_many_txn(
-        self, txn: LoggingTransaction, table: str, headers: List[str], rows: List[Tuple]
+        self,
+        txn: LoggingTransaction,
+        table: str,
+        headers: List[str],
+        rows: List[Tuple],
+        override_system_value: bool = False,
     ) -> None:
-        sql = "INSERT INTO %s (%s) VALUES (%s)" % (
+        sql = "INSERT INTO %s (%s) %s VALUES (%s)" % (
             table,
             ", ".join(k for k in headers),
+            "OVERRIDING SYSTEM VALUE" if override_system_value else "",
             ", ".join("%s" for _ in headers),
         )
 
@@ -532,7 +544,13 @@ class Porter:
 
                 def insert(txn: LoggingTransaction) -> None:
                     assert headers is not None
-                    self.postgres_store.insert_many_txn(txn, table, headers[1:], rows)
+                    self.postgres_store.insert_many_txn(
+                        txn,
+                        table,
+                        headers[1:],
+                        rows,
+                        override_system_value=table in AUTOINCREMENT_TABLES,
+                    )
 
                     self.postgres_store.db_pool.simple_update_one_txn(
                         txn,
@@ -654,8 +672,14 @@ class Porter:
         engine = create_engine(db_config.config)
 
         hs = MockHomeserver(self.hs_config)
+        server_name = hs.hostname
 
-        with make_conn(db_config, engine, "portdb") as db_conn:
+        with make_conn(
+            db_config=db_config,
+            engine=engine,
+            default_txn_name="portdb",
+            server_name=server_name,
+        ) as db_conn:
             engine.check_database(
                 db_conn, allow_outdated_version=allow_outdated_version
             )
@@ -884,6 +908,19 @@ class Porter:
                 ],
             )
 
+            await self._setup_autoincrement_sequence(
+                "sliding_sync_connection_positions", "connection_position"
+            )
+            await self._setup_autoincrement_sequence(
+                "sliding_sync_connection_required_state", "required_state_id"
+            )
+            await self._setup_autoincrement_sequence(
+                "sliding_sync_connections", "connection_key"
+            )
+            await self._setup_autoincrement_sequence(
+                "state_groups_pending_deletion", "sequence_number"
+            )
+
             # Step 3. Get tables.
             self.progress.set_state("Fetching tables")
             sqlite_tables = await self.sqlite_store.db_pool.simple_select_onecol(
@@ -1216,6 +1253,49 @@ class Porter:
             "_setup_%s" % (sequence_name,), r
         )
 
+    async def _setup_autoincrement_sequence(
+        self,
+        sqlite_table_name: str,
+        sqlite_id_column_name: str,
+    ) -> None:
+        """Set a sequence to the correct value. Use where id column was declared with PRIMARY KEY AUTOINCREMENT."""
+        seq_name = await self._pg_get_serial_sequence(
+            sqlite_table_name, sqlite_id_column_name
+        )
+        if seq_name is None:
+            raise Exception(
+                "implicit sequence not found for table " + sqlite_table_name
+            )
+
+        seq_value = await self.sqlite_store.db_pool.simple_select_one_onecol(
+            table="sqlite_sequence",
+            keyvalues={"name": sqlite_table_name},
+            retcol="seq",
+            allow_none=True,
+        )
+        if seq_value is None:
+            return
+
+        def r(txn: LoggingTransaction) -> None:
+            sql = "ALTER SEQUENCE %s RESTART WITH" % (seq_name,)
+            txn.execute(sql + " %s", (seq_value + 1,))
+
+        await self.postgres_store.db_pool.runInteraction("_setup_%s" % (seq_name,), r)
+
+    async def _pg_get_serial_sequence(self, table: str, column: str) -> Optional[str]:
+        """Returns the name of the postgres sequence associated with a column, or NULL."""
+
+        def r(txn: LoggingTransaction) -> Optional[str]:
+            txn.execute("SELECT pg_get_serial_sequence('%s', '%s')" % (table, column))
+            result = txn.fetchone()
+            if not result:
+                return None
+            return result[0]
+
+        return await self.postgres_store.db_pool.runInteraction(
+            "_pg_get_serial_sequence", r
+        )
+
     async def _setup_auth_chain_sequence(self) -> None:
         curr_chain_id: Optional[
             int

synapse/_scripts/update_synapse_database.py

@@ -53,6 +53,7 @@ class MockHomeserver(HomeServer):
 
 
 def run_background_updates(hs: HomeServer) -> None:
+    server_name = hs.hostname
     main = hs.get_datastores().main
     state = hs.get_datastores().state
 
@@ -66,7 +67,11 @@ def run_background_updates(hs: HomeServer) -> None:
     def run() -> None:
         # Apply all background updates on the database.
         defer.ensureDeferred(
-            run_as_background_process("background_updates", run_background_updates)
+            run_as_background_process(
+                "background_updates",
+                server_name,
+                run_background_updates,
+            )
         )
 
     reactor.callWhenRunning(run)

synapse/api/auth/__init__.py

@@ -20,10 +20,13 @@
 #
 from typing import TYPE_CHECKING, Optional, Protocol, Tuple
 
+from prometheus_client import Histogram
+
 from twisted.web.server import Request
 
 from synapse.appservice import ApplicationService
 from synapse.http.site import SynapseRequest
+from synapse.metrics import SERVER_NAME_LABEL
 from synapse.types import Requester
 
 if TYPE_CHECKING:
@@ -33,6 +36,13 @@ if TYPE_CHECKING:
 GUEST_DEVICE_ID = "guest_device"
 
 
+introspection_response_timer = Histogram(
+    "synapse_api_auth_delegated_introspection_response",
+    "Time taken to get a response for an introspection request",
+    labelnames=["code", SERVER_NAME_LABEL],
+)
+
+
 class Auth(Protocol):
     """The interface that an auth provider must implement."""
 

synapse/api/auth/base.py

@@ -172,7 +172,7 @@ class BaseAuth:
         """
 
         # It's ok if the app service is trying to use the sender from their registration
-        if app_service.sender == user_id:
+        if app_service.sender.to_string() == user_id:
             pass
         # Check to make sure the app service is allowed to control the user
         elif not app_service.is_interested_in_user(user_id):

synapse/api/auth/internal.py

@@ -296,4 +296,4 @@ class InternalAuth(BaseAuth):
         Returns:
             True if the user is an admin
         """
-        return await self.store.is_server_admin(requester.user)
+        return await self.store.is_server_admin(requester.user.to_string())

synapse/api/auth/mas.py

@@ -0,0 +1,432 @@
+#
+# This file is licensed under the Affero General Public License (AGPL) version 3.
+#
+# Copyright (C) 2025 New Vector, Ltd
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# See the GNU Affero General Public License for more details:
+# <https://www.gnu.org/licenses/agpl-3.0.html>.
+#
+#
+import logging
+from typing import TYPE_CHECKING, Optional
+from urllib.parse import urlencode
+
+from synapse._pydantic_compat import (
+    BaseModel,
+    Extra,
+    StrictBool,
+    StrictInt,
+    StrictStr,
+    ValidationError,
+)
+from synapse.api.auth.base import BaseAuth
+from synapse.api.errors import (
+    AuthError,
+    HttpResponseException,
+    InvalidClientTokenError,
+    SynapseError,
+    UnrecognizedRequestError,
+)
+from synapse.http.site import SynapseRequest
+from synapse.logging.context import PreserveLoggingContext
+from synapse.logging.opentracing import (
+    active_span,
+    force_tracing,
+    inject_request_headers,
+    start_active_span,
+)
+from synapse.metrics import SERVER_NAME_LABEL
+from synapse.synapse_rust.http_client import HttpClient
+from synapse.types import JsonDict, Requester, UserID, create_requester
+from synapse.util import json_decoder
+from synapse.util.caches.cached_call import RetryOnExceptionCachedCall
+from synapse.util.caches.response_cache import ResponseCache, ResponseCacheContext
+
+from . import introspection_response_timer
+
+if TYPE_CHECKING:
+    from synapse.rest.admin.experimental_features import ExperimentalFeature
+    from synapse.server import HomeServer
+
+logger = logging.getLogger(__name__)
+
+# Scope as defined by MSC2967
+# https://github.com/matrix-org/matrix-spec-proposals/pull/2967
+SCOPE_MATRIX_API = "urn:matrix:org.matrix.msc2967.client:api:*"
+SCOPE_MATRIX_DEVICE_PREFIX = "urn:matrix:org.matrix.msc2967.client:device:"
+
+
+class ServerMetadata(BaseModel):
+    class Config:
+        extra = Extra.allow
+
+    issuer: StrictStr
+    account_management_uri: StrictStr
+
+
+class IntrospectionResponse(BaseModel):
+    retrieved_at_ms: StrictInt
+    active: StrictBool
+    scope: Optional[StrictStr]
+    username: Optional[StrictStr]
+    sub: Optional[StrictStr]
+    device_id: Optional[StrictStr]
+    expires_in: Optional[StrictInt]
+
+    class Config:
+        extra = Extra.allow
+
+    def get_scope_set(self) -> set[str]:
+        if not self.scope:
+            return set()
+
+        return {token for token in self.scope.split(" ") if token}
+
+    def is_active(self, now_ms: int) -> bool:
+        if not self.active:
+            return False
+
+        # Compatibility tokens don't expire and don't have an 'expires_in' field
+        if self.expires_in is None:
+            return True
+
+        absolute_expiry_ms = self.expires_in * 1000 + self.retrieved_at_ms
+        return now_ms < absolute_expiry_ms
+
+
+class MasDelegatedAuth(BaseAuth):
+    def __init__(self, hs: "HomeServer"):
+        super().__init__(hs)
+
+        self.server_name = hs.hostname
+        self._clock = hs.get_clock()
+        self._config = hs.config.mas
+
+        self._http_client = hs.get_proxied_http_client()
+        self._rust_http_client = HttpClient(
+            reactor=hs.get_reactor(),
+            user_agent=self._http_client.user_agent.decode("utf8"),
+        )
+        self._server_metadata = RetryOnExceptionCachedCall[ServerMetadata](
+            self._load_metadata
+        )
+        self._force_tracing_for_users = hs.config.tracing.force_tracing_for_users
+
+        # # Token Introspection Cache
+        # This remembers what users/devices are represented by which access tokens,
+        # in order to reduce overall system load:
+        # - on Synapse (as requests are relatively expensive)
+        # - on the network
+        # - on MAS
+        #
+        # Since there is no invalidation mechanism currently,
+        # the entries expire after 2 minutes.
+        # This does mean tokens can be treated as valid by Synapse
+        # for longer than reality.
+        #
+        # Ideally, tokens should logically be invalidated in the following circumstances:
+        # - If a session logout happens.
+        #   In this case, MAS will delete the device within Synapse
+        #   anyway and this is good enough as an invalidation.
+        # - If the client refreshes their token in MAS.
+        #   In this case, the device still exists and it's not the end of the world for
+        #   the old access token to continue working for a short time.
+        self._introspection_cache: ResponseCache[str] = ResponseCache(
+            clock=self._clock,
+            name="mas_token_introspection",
+            server_name=self.server_name,
+            timeout_ms=120_000,
+            # don't log because the keys are access tokens
+            enable_logging=False,
+        )
+
+    @property
+    def _metadata_url(self) -> str:
+        return f"{self._config.endpoint.rstrip('/')}/.well-known/openid-configuration"
+
+    @property
+    def _introspection_endpoint(self) -> str:
+        return f"{self._config.endpoint.rstrip('/')}/oauth2/introspect"
+
+    async def _load_metadata(self) -> ServerMetadata:
+        response = await self._http_client.get_json(self._metadata_url)
+        metadata = ServerMetadata(**response)
+        return metadata
+
+    async def issuer(self) -> str:
+        metadata = await self._server_metadata.get()
+        return metadata.issuer
+
+    async def account_management_url(self) -> str:
+        metadata = await self._server_metadata.get()
+        return metadata.account_management_uri
+
+    async def auth_metadata(self) -> JsonDict:
+        metadata = await self._server_metadata.get()
+        return metadata.dict()
+
+    def is_request_using_the_shared_secret(self, request: SynapseRequest) -> bool:
+        """
+        Check if the request is using the shared secret.
+
+        Args:
+            request: The request to check.
+
+        Returns:
+            True if the request is using the shared secret, False otherwise.
+        """
+        access_token = self.get_access_token_from_request(request)
+        shared_secret = self._config.secret()
+        if not shared_secret:
+            return False
+
+        return access_token == shared_secret
+
+    async def _introspect_token(
+        self, token: str, cache_context: ResponseCacheContext[str]
+    ) -> IntrospectionResponse:
+        """
+        Send a token to the introspection endpoint and returns the introspection response
+
+        Parameters:
+            token: The token to introspect
+
+        Raises:
+            HttpResponseException: If the introspection endpoint returns a non-2xx response
+            ValueError: If the introspection endpoint returns an invalid JSON response
+            JSONDecodeError: If the introspection endpoint returns a non-JSON response
+            Exception: If the HTTP request fails
+
+        Returns:
+            The introspection response
+        """
+
+        # By default, we shouldn't cache the result unless we know it's valid
+        cache_context.should_cache = False
+        raw_headers: dict[str, str] = {
+            "Content-Type": "application/x-www-form-urlencoded",
+            "Accept": "application/json",
+            "Authorization": f"Bearer {self._config.secret()}",
+            # Tell MAS that we support reading the device ID as an explicit
+            # value, not encoded in the scope. This is supported by MAS 0.15+
+            "X-MAS-Supports-Device-Id": "1",
+        }
+
+        args = {"token": token, "token_type_hint": "access_token"}
+        body = urlencode(args, True)
+
+        # Do the actual request
+
+        logger.debug("Fetching token from MAS")
+        start_time = self._clock.time()
+        try:
+            with start_active_span("mas-introspect-token"):
+                inject_request_headers(raw_headers)
+                with PreserveLoggingContext():
+                    resp_body = await self._rust_http_client.post(
+                        url=self._introspection_endpoint,
+                        response_limit=1 * 1024 * 1024,
+                        headers=raw_headers,
+                        request_body=body,
+                    )
+        except HttpResponseException as e:
+            end_time = self._clock.time()
+            introspection_response_timer.labels(
+                code=e.code, **{SERVER_NAME_LABEL: self.server_name}
+            ).observe(end_time - start_time)
+            raise
+        except Exception:
+            end_time = self._clock.time()
+            introspection_response_timer.labels(
+                code="ERR", **{SERVER_NAME_LABEL: self.server_name}
+            ).observe(end_time - start_time)
+            raise
+
+        logger.debug("Fetched token from MAS")
+
+        end_time = self._clock.time()
+        introspection_response_timer.labels(
+            code=200, **{SERVER_NAME_LABEL: self.server_name}
+        ).observe(end_time - start_time)
+
+        raw_response = json_decoder.decode(resp_body.decode("utf-8"))
+        try:
+            response = IntrospectionResponse(
+                retrieved_at_ms=self._clock.time_msec(),
+                **raw_response,
+            )
+        except ValidationError as e:
+            raise ValueError(
+                "The introspection endpoint returned an invalid JSON response"
+            ) from e
+
+        # We had a valid response, so we can cache it
+        cache_context.should_cache = True
+        return response
+
+    async def is_server_admin(self, requester: Requester) -> bool:
+        return "urn:synapse:admin:*" in requester.scope
+
+    async def get_user_by_req(
+        self,
+        request: SynapseRequest,
+        allow_guest: bool = False,
+        allow_expired: bool = False,
+        allow_locked: bool = False,
+    ) -> Requester:
+        parent_span = active_span()
+        with start_active_span("get_user_by_req"):
+            access_token = self.get_access_token_from_request(request)
+
+            requester = await self.get_appservice_user(request, access_token)
+            if not requester:
+                requester = await self.get_user_by_access_token(
+                    token=access_token,
+                    allow_expired=allow_expired,
+                )
+
+            await self._record_request(request, requester)
+
+            request.requester = requester
+
+            if parent_span:
+                if requester.authenticated_entity in self._force_tracing_for_users:
+                    # request tracing is enabled for this user, so we need to force it
+                    # tracing on for the parent span (which will be the servlet span).
+                    #
+                    # It's too late for the get_user_by_req span to inherit the setting,
+                    # so we also force it on for that.
+                    force_tracing()
+                    force_tracing(parent_span)
+                parent_span.set_tag(
+                    "authenticated_entity", requester.authenticated_entity
+                )
+                parent_span.set_tag("user_id", requester.user.to_string())
+                if requester.device_id is not None:
+                    parent_span.set_tag("device_id", requester.device_id)
+                if requester.app_service is not None:
+                    parent_span.set_tag("appservice_id", requester.app_service.id)
+            return requester
+
+    async def get_user_by_access_token(
+        self,
+        token: str,
+        allow_expired: bool = False,
+    ) -> Requester:
+        try:
+            introspection_result = await self._introspection_cache.wrap(
+                token, self._introspect_token, token, cache_context=True
+            )
+        except Exception:
+            logger.exception("Failed to introspect token")
+            raise SynapseError(503, "Unable to introspect the access token")
+
+        logger.debug("Introspection result: %r", introspection_result)
+        if not introspection_result.is_active(self._clock.time_msec()):
+            raise InvalidClientTokenError("Token is not active")
+
+        # Let's look at the scope
+        scope = introspection_result.get_scope_set()
+
+        # Determine type of user based on presence of particular scopes
+        if SCOPE_MATRIX_API not in scope:
+            raise InvalidClientTokenError(
+                "Token doesn't grant access to the Matrix C-S API"
+            )
+
+        if introspection_result.username is None:
+            raise AuthError(
+                500,
+                "Invalid username claim in the introspection result",
+            )
+
+        user_id = UserID(
+            localpart=introspection_result.username,
+            domain=self.server_name,
+        )
+
+        # Try to find a user from the username claim
+        user_info = await self.store.get_user_by_id(user_id=user_id.to_string())
+        if user_info is None:
+            raise AuthError(
+                500,
+                "User not found",
+            )
+
+        # MAS will give us the device ID as an explicit value for *compatibility* sessions
+        # If present, we get it from here, if not we get it in the scope for next-gen sessions
+        device_id = introspection_result.device_id
+        if device_id is None:
+            # Find device_ids in scope
+            # We only allow a single device_id in the scope, so we find them all in the
+            # scope list, and raise if there are more than one. The OIDC server should be
+            # the one enforcing valid scopes, so we raise a 500 if we find an invalid scope.
+            device_ids = [
+                tok[len(SCOPE_MATRIX_DEVICE_PREFIX) :]
+                for tok in scope
+                if tok.startswith(SCOPE_MATRIX_DEVICE_PREFIX)
+            ]
+
+            if len(device_ids) > 1:
+                raise AuthError(
+                    500,
+                    "Multiple device IDs in scope",
+                )
+
+            device_id = device_ids[0] if device_ids else None
+
+        if device_id is not None:
+            # Sanity check the device_id
+            if len(device_id) > 255 or len(device_id) < 1:
+                raise AuthError(
+                    500,
+                    "Invalid device ID in introspection result",
+                )
+
+            # Make sure the device exists. This helps with introspection cache
+            # invalidation: if we log out, the device gets deleted by MAS
+            device = await self.store.get_device(
+                user_id=user_id.to_string(),
+                device_id=device_id,
+            )
+            if device is None:
+                # Invalidate the introspection cache, the device was deleted
+                self._introspection_cache.unset(token)
+                raise InvalidClientTokenError("Token is not active")
+
+        return create_requester(
+            user_id=user_id,
+            device_id=device_id,
+            scope=scope,
+        )
+
+    async def get_user_by_req_experimental_feature(
+        self,
+        request: SynapseRequest,
+        feature: "ExperimentalFeature",
+        allow_guest: bool = False,
+        allow_expired: bool = False,
+        allow_locked: bool = False,
+    ) -> Requester:
+        try:
+            requester = await self.get_user_by_req(
+                request,
+                allow_guest=allow_guest,
+                allow_expired=allow_expired,
+                allow_locked=allow_locked,
+            )
+            if await self.store.is_feature_enabled(requester.user.to_string(), feature):
+                return requester
+
+            raise UnrecognizedRequestError(code=404)
+        except (AuthError, InvalidClientTokenError):
+            if feature.is_globally_enabled(self.hs.config):
+                # If its globally enabled then return the auth error
+                raise
+
+            raise UnrecognizedRequestError(code=404)

synapse/api/auth/msc3861_delegated.py

@@ -28,7 +28,6 @@ from authlib.oauth2.auth import encode_client_secret_basic, encode_client_secret
 from authlib.oauth2.rfc7523 import ClientSecretJWT, PrivateKeyJWT, private_key_jwt_sign
 from authlib.oauth2.rfc7662 import IntrospectionToken
 from authlib.oidc.discovery import OpenIDProviderMetadata, get_well_known_url
-from prometheus_client import Histogram
 
 from synapse.api.auth.base import BaseAuth
 from synapse.api.errors import (
@@ -47,25 +46,21 @@ from synapse.logging.opentracing import (
     inject_request_headers,
     start_active_span,
 )
+from synapse.metrics import SERVER_NAME_LABEL
 from synapse.synapse_rust.http_client import HttpClient
 from synapse.types import Requester, UserID, create_requester
 from synapse.util import json_decoder
 from synapse.util.caches.cached_call import RetryOnExceptionCachedCall
 from synapse.util.caches.response_cache import ResponseCache, ResponseCacheContext
 
+from . import introspection_response_timer
+
 if TYPE_CHECKING:
     from synapse.rest.admin.experimental_features import ExperimentalFeature
     from synapse.server import HomeServer
 
 logger = logging.getLogger(__name__)
 
-introspection_response_timer = Histogram(
-    "synapse_api_auth_delegated_introspection_response",
-    "Time taken to get a response for an introspection request",
-    ["code"],
-)
-
-
 # Scope as defined by MSC2967
 # https://github.com/matrix-org/matrix-spec-proposals/pull/2967
 SCOPE_MATRIX_API = "urn:matrix:org.matrix.msc2967.client:api:*"
@@ -176,6 +171,7 @@ class MSC3861DelegatedAuth(BaseAuth):
         assert self._config.client_id, "No client_id provided"
         assert auth_method is not None, "Invalid client_auth_method provided"
 
+        self.server_name = hs.hostname
         self._clock = hs.get_clock()
         self._http_client = hs.get_proxied_http_client()
         self._hostname = hs.hostname
@@ -183,7 +179,8 @@ class MSC3861DelegatedAuth(BaseAuth):
         self._force_tracing_for_users = hs.config.tracing.force_tracing_for_users
 
         self._rust_http_client = HttpClient(
-            user_agent=self._http_client.user_agent.decode("utf8")
+            reactor=hs.get_reactor(),
+            user_agent=self._http_client.user_agent.decode("utf8"),
         )
 
         # # Token Introspection Cache
@@ -206,8 +203,9 @@ class MSC3861DelegatedAuth(BaseAuth):
         #   In this case, the device still exists and it's not the end of the world for
         #   the old access token to continue working for a short time.
         self._introspection_cache: ResponseCache[str] = ResponseCache(
-            self._clock,
-            "token_introspection",
+            clock=self._clock,
+            name="token_introspection",
+            server_name=self.server_name,
             timeout_ms=120_000,
             # don't log because the keys are access tokens
             enable_logging=False,
@@ -338,17 +336,23 @@ class MSC3861DelegatedAuth(BaseAuth):
                     )
         except HttpResponseException as e:
             end_time = self._clock.time()
-            introspection_response_timer.labels(e.code).observe(end_time - start_time)
+            introspection_response_timer.labels(
+                code=e.code, **{SERVER_NAME_LABEL: self.server_name}
+            ).observe(end_time - start_time)
             raise
         except Exception:
             end_time = self._clock.time()
-            introspection_response_timer.labels("ERR").observe(end_time - start_time)
+            introspection_response_timer.labels(
+                code="ERR", **{SERVER_NAME_LABEL: self.server_name}
+            ).observe(end_time - start_time)
             raise
 
         logger.debug("Fetched token from MAS")
 
         end_time = self._clock.time()
-        introspection_response_timer.labels(200).observe(end_time - start_time)
+        introspection_response_timer.labels(
+            code=200, **{SERVER_NAME_LABEL: self.server_name}
+        ).observe(end_time - start_time)
 
         resp = json_decoder.decode(resp_body.decode("utf-8"))
 
@@ -366,6 +370,12 @@ class MSC3861DelegatedAuth(BaseAuth):
     async def is_server_admin(self, requester: Requester) -> bool:
         return "urn:synapse:admin:*" in requester.scope
 
+    def _is_access_token_the_admin_token(self, token: str) -> bool:
+        admin_token = self._admin_token()
+        if admin_token is None:
+            return False
+        return token == admin_token
+
     async def get_user_by_req(
         self,
         request: SynapseRequest,
@@ -431,7 +441,7 @@ class MSC3861DelegatedAuth(BaseAuth):
             requester = await self.get_user_by_access_token(access_token, allow_expired)
 
         # Do not record requests from MAS using the virtual `__oidc_admin` user.
-        if access_token != self._admin_token():
+        if not self._is_access_token_the_admin_token(access_token):
             await self._record_request(request, requester)
 
         if not allow_guest and requester.is_guest:
@@ -467,17 +477,29 @@ class MSC3861DelegatedAuth(BaseAuth):
 
             raise UnrecognizedRequestError(code=404)
 
+    def is_request_using_the_admin_token(self, request: SynapseRequest) -> bool:
+        """
+        Check if the request is using the admin token.
+
+        Args:
+            request: The request to check.
+
+        Returns:
+            True if the request is using the admin token, False otherwise.
+        """
+        access_token = self.get_access_token_from_request(request)
+        return self._is_access_token_the_admin_token(access_token)
+
     async def get_user_by_access_token(
         self,
         token: str,
         allow_expired: bool = False,
     ) -> Requester:
-        admin_token = self._admin_token()
-        if admin_token is not None and token == admin_token:
+        if self._is_access_token_the_admin_token(token):
             # XXX: This is a temporary solution so that the admin API can be called by
             # the OIDC provider. This will be removed once we have OIDC client
             # credentials grant support in matrix-authentication-service.
-            logger.info("Admin toked used")
+            logger.info("Admin token used")
             # XXX: that user doesn't exist and won't be provisioned.
             # This is mostly fine for admin calls, but we should also think about doing
             # requesters without a user_id.

synapse/api/constants.py

@@ -46,6 +46,9 @@ MAX_USERID_LENGTH = 255
 # Constant value used for the pseudo-thread which is the main timeline.
 MAIN_TIMELINE: Final = "main"
 
+# MAX_INT + 1, so it always trumps any PL in canonical JSON.
+CREATOR_POWER_LEVEL = 2**53
+
 
 class Membership:
     """Represents the membership states of a user in a room."""
@@ -235,6 +238,8 @@ class EventContentFields:
     #
     # This is deprecated in MSC2175.
     ROOM_CREATOR: Final = "creator"
+    # MSC4289
+    ADDITIONAL_CREATORS: Final = "additional_creators"
 
     # The version of the room for `m.room.create` events.
     ROOM_VERSION: Final = "room_version"
@@ -262,6 +267,11 @@ class EventContentFields:
 
     TOMBSTONE_SUCCESSOR_ROOM: Final = "replacement_room"
 
+    # Used in m.room.topic events.
+    TOPIC: Final = "topic"
+    M_TOPIC: Final = "m.topic"
+    M_TEXT: Final = "m.text"
+
 
 class EventUnsignedContentFields:
     """Fields found inside the 'unsigned' data on events"""
@@ -270,6 +280,13 @@ class EventUnsignedContentFields:
     MEMBERSHIP: Final = "membership"
 
 
+class MTextFields:
+    """Fields found inside m.text content blocks."""
+
+    BODY: Final = "body"
+    MIMETYPE: Final = "mimetype"
+
+
 class RoomTypes:
     """Understood values of the room_type field of m.room.create events."""
 
@@ -290,6 +307,9 @@ class AccountDataTypes:
     MSC4155_INVITE_PERMISSION_CONFIG: Final = (
         "org.matrix.msc4155.invite_permission_config"
     )
+    # Synapse-specific behaviour. See "Client-Server API Extensions" documentation
+    # in Admin API for more information.
+    SYNAPSE_ADMIN_CLIENT_CONFIG: Final = "io.element.synapse.admin_client_config"
 
 
 class HistoryVisibility:

synapse/api/errors.py

@@ -140,6 +140,12 @@ class Codes(str, Enum):
     # Part of MSC4155
     INVITE_BLOCKED = "ORG.MATRIX.MSC4155.M_INVITE_BLOCKED"
 
+    # Part of MSC4306: Thread Subscriptions
+    MSC4306_CONFLICTING_UNSUBSCRIPTION = (
+        "IO.ELEMENT.MSC4306.M_CONFLICTING_UNSUBSCRIPTION"
+    )
+    MSC4306_NOT_IN_THREAD = "IO.ELEMENT.MSC4306.M_NOT_IN_THREAD"
+
 
 class CodeMessageException(RuntimeError):
     """An exception with integer code, a message string attributes and optional headers.

synapse/api/room_versions.py

@@ -36,12 +36,14 @@ class EventFormatVersions:
     ROOM_V1_V2 = 1  # $id:server event id format: used for room v1 and v2
     ROOM_V3 = 2  # MSC1659-style $hash event id format: used for room v3
     ROOM_V4_PLUS = 3  # MSC1884-style $hash format: introduced for room v4
+    ROOM_V11_HYDRA_PLUS = 4  # MSC4291 room IDs as hashes: introduced for room HydraV11
 
 
 KNOWN_EVENT_FORMAT_VERSIONS = {
     EventFormatVersions.ROOM_V1_V2,
     EventFormatVersions.ROOM_V3,
     EventFormatVersions.ROOM_V4_PLUS,
+    EventFormatVersions.ROOM_V11_HYDRA_PLUS,
 }
 
 
@@ -50,6 +52,7 @@ class StateResolutionVersions:
 
     V1 = 1  # room v1 state res
     V2 = 2  # MSC1442 state res: room v2 and later
+    V2_1 = 3  # MSC4297 state res
 
 
 class RoomDisposition:
@@ -109,6 +112,10 @@ class RoomVersion:
     msc3931_push_features: Tuple[str, ...]  # values from PushRuleRoomFlag
     # MSC3757: Restricting who can overwrite a state event
     msc3757_enabled: bool
+    # MSC4289: Creator power enabled
+    msc4289_creator_power_enabled: bool
+    # MSC4291: Room IDs as hashes of the create event
+    msc4291_room_ids_as_hashes: bool
 
 
 class RoomVersions:
@@ -131,6 +138,8 @@ class RoomVersions:
         enforce_int_power_levels=False,
         msc3931_push_features=(),
         msc3757_enabled=False,
+        msc4289_creator_power_enabled=False,
+        msc4291_room_ids_as_hashes=False,
     )
     V2 = RoomVersion(
         "2",
@@ -151,6 +160,8 @@ class RoomVersions:
         enforce_int_power_levels=False,
         msc3931_push_features=(),
         msc3757_enabled=False,
+        msc4289_creator_power_enabled=False,
+        msc4291_room_ids_as_hashes=False,
     )
     V3 = RoomVersion(
         "3",
@@ -171,6 +182,8 @@ class RoomVersions:
         enforce_int_power_levels=False,
         msc3931_push_features=(),
         msc3757_enabled=False,
+        msc4289_creator_power_enabled=False,
+        msc4291_room_ids_as_hashes=False,
     )
     V4 = RoomVersion(
         "4",
@@ -191,6 +204,8 @@ class RoomVersions:
         enforce_int_power_levels=False,
         msc3931_push_features=(),
         msc3757_enabled=False,
+        msc4289_creator_power_enabled=False,
+        msc4291_room_ids_as_hashes=False,
     )
     V5 = RoomVersion(
         "5",
@@ -211,6 +226,8 @@ class RoomVersions:
         enforce_int_power_levels=False,
         msc3931_push_features=(),
         msc3757_enabled=False,
+        msc4289_creator_power_enabled=False,
+        msc4291_room_ids_as_hashes=False,
     )
     V6 = RoomVersion(
         "6",
@@ -231,6 +248,8 @@ class RoomVersions:
         enforce_int_power_levels=False,
         msc3931_push_features=(),
         msc3757_enabled=False,
+        msc4289_creator_power_enabled=False,
+        msc4291_room_ids_as_hashes=False,
     )
     V7 = RoomVersion(
         "7",
@@ -251,6 +270,8 @@ class RoomVersions:
         enforce_int_power_levels=False,
         msc3931_push_features=(),
         msc3757_enabled=False,
+        msc4289_creator_power_enabled=False,
+        msc4291_room_ids_as_hashes=False,
     )
     V8 = RoomVersion(
         "8",
@@ -271,6 +292,8 @@ class RoomVersions:
         enforce_int_power_levels=False,
         msc3931_push_features=(),
         msc3757_enabled=False,
+        msc4289_creator_power_enabled=False,
+        msc4291_room_ids_as_hashes=False,
     )
     V9 = RoomVersion(
         "9",
@@ -291,6 +314,8 @@ class RoomVersions:
         enforce_int_power_levels=False,
         msc3931_push_features=(),
         msc3757_enabled=False,
+        msc4289_creator_power_enabled=False,
+        msc4291_room_ids_as_hashes=False,
     )
     V10 = RoomVersion(
         "10",
@@ -311,6 +336,8 @@ class RoomVersions:
         enforce_int_power_levels=True,
         msc3931_push_features=(),
         msc3757_enabled=False,
+        msc4289_creator_power_enabled=False,
+        msc4291_room_ids_as_hashes=False,
     )
     MSC1767v10 = RoomVersion(
         # MSC1767 (Extensible Events) based on room version "10"
@@ -332,6 +359,8 @@ class RoomVersions:
         enforce_int_power_levels=True,
         msc3931_push_features=(PushRuleRoomFlag.EXTENSIBLE_EVENTS,),
         msc3757_enabled=False,
+        msc4289_creator_power_enabled=False,
+        msc4291_room_ids_as_hashes=False,
     )
     MSC3757v10 = RoomVersion(
         # MSC3757 (Restricting who can overwrite a state event) based on room version "10"
@@ -353,6 +382,8 @@ class RoomVersions:
         enforce_int_power_levels=True,
         msc3931_push_features=(),
         msc3757_enabled=True,
+        msc4289_creator_power_enabled=False,
+        msc4291_room_ids_as_hashes=False,
     )
     V11 = RoomVersion(
         "11",
@@ -373,6 +404,8 @@ class RoomVersions:
         enforce_int_power_levels=True,
         msc3931_push_features=(),
         msc3757_enabled=False,
+        msc4289_creator_power_enabled=False,
+        msc4291_room_ids_as_hashes=False,
     )
     MSC3757v11 = RoomVersion(
         # MSC3757 (Restricting who can overwrite a state event) based on room version "11"
@@ -394,6 +427,52 @@ class RoomVersions:
         enforce_int_power_levels=True,
         msc3931_push_features=(),
         msc3757_enabled=True,
+        msc4289_creator_power_enabled=False,
+        msc4291_room_ids_as_hashes=False,
+    )
+    HydraV11 = RoomVersion(
+        "org.matrix.hydra.11",
+        RoomDisposition.UNSTABLE,
+        EventFormatVersions.ROOM_V11_HYDRA_PLUS,
+        StateResolutionVersions.V2_1,  # Changed from v11
+        enforce_key_validity=True,
+        special_case_aliases_auth=False,
+        strict_canonicaljson=True,
+        limit_notifications_power_levels=True,
+        implicit_room_creator=True,  # Used by MSC3820
+        updated_redaction_rules=True,  # Used by MSC3820
+        restricted_join_rule=True,
+        restricted_join_rule_fix=True,
+        knock_join_rule=True,
+        msc3389_relation_redactions=False,
+        knock_restricted_join_rule=True,
+        enforce_int_power_levels=True,
+        msc3931_push_features=(),
+        msc3757_enabled=False,
+        msc4289_creator_power_enabled=True,  # Changed from v11
+        msc4291_room_ids_as_hashes=True,  # Changed from v11
+    )
+    V12 = RoomVersion(
+        "12",
+        RoomDisposition.STABLE,
+        EventFormatVersions.ROOM_V11_HYDRA_PLUS,
+        StateResolutionVersions.V2_1,  # Changed from v11
+        enforce_key_validity=True,
+        special_case_aliases_auth=False,
+        strict_canonicaljson=True,
+        limit_notifications_power_levels=True,
+        implicit_room_creator=True,  # Used by MSC3820
+        updated_redaction_rules=True,  # Used by MSC3820
+        restricted_join_rule=True,
+        restricted_join_rule_fix=True,
+        knock_join_rule=True,
+        msc3389_relation_redactions=False,
+        knock_restricted_join_rule=True,
+        enforce_int_power_levels=True,
+        msc3931_push_features=(),
+        msc3757_enabled=False,
+        msc4289_creator_power_enabled=True,  # Changed from v11
+        msc4291_room_ids_as_hashes=True,  # Changed from v11
     )
 
 
@@ -411,8 +490,10 @@ KNOWN_ROOM_VERSIONS: Dict[str, RoomVersion] = {
         RoomVersions.V9,
         RoomVersions.V10,
         RoomVersions.V11,
+        RoomVersions.V12,
         RoomVersions.MSC3757v10,
         RoomVersions.MSC3757v11,
+        RoomVersions.HydraV11,
     )
 }
 

synapse/app/_base.py

@@ -75,7 +75,7 @@ from synapse.http.site import SynapseSite
 from synapse.logging.context import PreserveLoggingContext
 from synapse.logging.opentracing import init_tracer
 from synapse.metrics import install_gc_manager, register_threadpool
-from synapse.metrics.background_process_metrics import wrap_as_background_process
+from synapse.metrics.background_process_metrics import run_as_background_process
 from synapse.metrics.jemalloc import setup_jemalloc_stats
 from synapse.module_api.callbacks.spamchecker_callbacks import load_legacy_spam_checkers
 from synapse.module_api.callbacks.third_party_event_rules_callbacks import (
@@ -286,6 +286,16 @@ def register_start(
 def listen_metrics(bind_addresses: StrCollection, port: int) -> None:
     """
     Start Prometheus metrics server.
+
+    This method runs the metrics server on a different port, in a different thread to
+    Synapse. This can make it more resilient to heavy load in Synapse causing metric
+    requests to be slow or timeout.
+
+    Even though `start_http_server_prometheus(...)` uses `threading.Thread` behind the
+    scenes (where all threads share the GIL and only one thread can execute Python
+    bytecode at a time), this still works because the metrics thread can preempt the
+    Twisted reactor thread between bytecode boundaries and the metrics thread gets
+    scheduled with roughly equal priority to the Twisted reactor thread.
     """
     from prometheus_client import start_http_server as start_http_server_prometheus
 
@@ -293,32 +303,9 @@ def listen_metrics(bind_addresses: StrCollection, port: int) -> None:
 
     for host in bind_addresses:
         logger.info("Starting metrics listener on %s:%d", host, port)
-        _set_prometheus_client_use_created_metrics(False)
         start_http_server_prometheus(port, addr=host, registry=RegistryProxy)
 
 
-def _set_prometheus_client_use_created_metrics(new_value: bool) -> None:
-    """
-    Sets whether prometheus_client should expose `_created`-suffixed metrics for
-    all gauges, histograms and summaries.
-    There is no programmatic way to disable this without poking at internals;
-    the proper way is to use an environment variable which prometheus_client
-    loads at import time.
-
-    The motivation for disabling these `_created` metrics is that they're
-    a waste of space as they're not useful but they take up space in Prometheus.
-    """
-
-    import prometheus_client.metrics
-
-    if hasattr(prometheus_client.metrics, "_use_created"):
-        prometheus_client.metrics._use_created = new_value
-    else:
-        logger.error(
-            "Can't disable `_created` metrics in prometheus_client (brittle hack broken?)"
-        )
-
-
 def listen_manhole(
     bind_addresses: StrCollection,
     port: int,
@@ -525,6 +512,7 @@ async def start(hs: "HomeServer") -> None:
     Args:
         hs: homeserver instance
     """
+    server_name = hs.hostname
     reactor = hs.get_reactor()
 
     # We want to use a separate thread pool for the resolver so that large
@@ -537,22 +525,34 @@ async def start(hs: "HomeServer") -> None:
     )
 
     # Register the threadpools with our metrics.
-    register_threadpool("default", reactor.getThreadPool())
-    register_threadpool("gai_resolver", resolver_threadpool)
+    register_threadpool(
+        name="default", server_name=server_name, threadpool=reactor.getThreadPool()
+    )
+    register_threadpool(
+        name="gai_resolver", server_name=server_name, threadpool=resolver_threadpool
+    )
 
     # Set up the SIGHUP machinery.
     if hasattr(signal, "SIGHUP"):
 
-        @wrap_as_background_process("sighup")
-        async def handle_sighup(*args: Any, **kwargs: Any) -> None:
-            # Tell systemd our state, if we're using it. This will silently fail if
-            # we're not using systemd.
-            sdnotify(b"RELOADING=1")
+        def handle_sighup(*args: Any, **kwargs: Any) -> "defer.Deferred[None]":
+            async def _handle_sighup(*args: Any, **kwargs: Any) -> None:
+                # Tell systemd our state, if we're using it. This will silently fail if
+                # we're not using systemd.
+                sdnotify(b"RELOADING=1")
 
-            for i, args, kwargs in _sighup_callbacks:
-                i(*args, **kwargs)
+                for i, args, kwargs in _sighup_callbacks:
+                    i(*args, **kwargs)
 
-            sdnotify(b"READY=1")
+                sdnotify(b"READY=1")
+
+            return run_as_background_process(
+                "sighup",
+                server_name,
+                _handle_sighup,
+                *args,
+                **kwargs,
+            )
 
         # We defer running the sighup handlers until next reactor tick. This
         # is so that we're in a sane state, e.g. flushing the logs may fail

synapse/app/generic_worker.py

@@ -104,6 +104,9 @@ from synapse.storage.databases.main.stats import StatsStore
 from synapse.storage.databases.main.stream import StreamWorkerStore
 from synapse.storage.databases.main.tags import TagsWorkerStore
 from synapse.storage.databases.main.task_scheduler import TaskSchedulerWorkerStore
+from synapse.storage.databases.main.thread_subscriptions import (
+    ThreadSubscriptionsWorkerStore,
+)
 from synapse.storage.databases.main.transactions import TransactionWorkerStore
 from synapse.storage.databases.main.ui_auth import UIAuthWorkerStore
 from synapse.storage.databases.main.user_directory import UserDirectoryStore
@@ -118,7 +121,6 @@ class GenericWorkerStore(
     # FIXME(https://github.com/matrix-org/synapse/issues/3714): We need to add
     # UserDirectoryStore as we write directly rather than going via the correct worker.
     UserDirectoryStore,
-    StatsStore,
     UIAuthWorkerStore,
     EndToEndRoomKeyStore,
     PresenceStore,
@@ -133,6 +135,7 @@ class GenericWorkerStore(
     KeyStore,
     RoomWorkerStore,
     DirectoryWorkerStore,
+    ThreadSubscriptionsWorkerStore,
     PushRulesWorkerStore,
     ApplicationServiceTransactionWorkerStore,
     ApplicationServiceWorkerStore,
@@ -154,6 +157,7 @@ class GenericWorkerStore(
     StreamWorkerStore,
     EventsWorkerStore,
     RegistrationWorkerStore,
+    StatsStore,
     SearchStore,
     TransactionWorkerStore,
     LockStore,

synapse/app/phone_stats_home.py

@@ -26,7 +26,12 @@ from typing import TYPE_CHECKING, List, Mapping, Sized, Tuple
 
 from prometheus_client import Gauge
 
-from synapse.metrics.background_process_metrics import wrap_as_background_process
+from twisted.internet import defer
+
+from synapse.metrics import SERVER_NAME_LABEL
+from synapse.metrics.background_process_metrics import (
+    run_as_background_process,
+)
 from synapse.types import JsonDict
 from synapse.util.constants import ONE_HOUR_SECONDS, ONE_MINUTE_SECONDS
 
@@ -53,138 +58,158 @@ Phone home stats are sent every 3 hours
 _stats_process: List[Tuple[int, "resource.struct_rusage"]] = []
 
 # Gauges to expose monthly active user control metrics
-current_mau_gauge = Gauge("synapse_admin_mau_current", "Current MAU")
+current_mau_gauge = Gauge(
+    "synapse_admin_mau_current",
+    "Current MAU",
+    labelnames=[SERVER_NAME_LABEL],
+)
 current_mau_by_service_gauge = Gauge(
     "synapse_admin_mau_current_mau_by_service",
     "Current MAU by service",
-    ["app_service"],
+    labelnames=["app_service", SERVER_NAME_LABEL],
+)
+max_mau_gauge = Gauge(
+    "synapse_admin_mau_max",
+    "MAU Limit",
+    labelnames=[SERVER_NAME_LABEL],
 )
-max_mau_gauge = Gauge("synapse_admin_mau_max", "MAU Limit")
 registered_reserved_users_mau_gauge = Gauge(
     "synapse_admin_mau_registered_reserved_users",
     "Registered users with reserved threepids",
+    labelnames=[SERVER_NAME_LABEL],
 )
 
 
-@wrap_as_background_process("phone_stats_home")
-async def phone_stats_home(
+def phone_stats_home(
     hs: "HomeServer",
     stats: JsonDict,
     stats_process: List[Tuple[int, "resource.struct_rusage"]] = _stats_process,
-) -> None:
-    """Collect usage statistics and send them to the configured endpoint.
+) -> "defer.Deferred[None]":
+    server_name = hs.hostname
 
-    Args:
-        hs: the HomeServer object to use for gathering usage data.
-        stats: the dict in which to store the statistics sent to the configured
-            endpoint. Mostly used in tests to figure out the data that is supposed to
-            be sent.
-        stats_process: statistics about resource usage of the process.
-    """
+    async def _phone_stats_home(
+        hs: "HomeServer",
+        stats: JsonDict,
+        stats_process: List[Tuple[int, "resource.struct_rusage"]] = _stats_process,
+    ) -> None:
+        """Collect usage statistics and send them to the configured endpoint.
 
-    logger.info("Gathering stats for reporting")
-    now = int(hs.get_clock().time())
-    # Ensure the homeserver has started.
-    assert hs.start_time is not None
-    uptime = int(now - hs.start_time)
-    if uptime < 0:
-        uptime = 0
+        Args:
+            hs: the HomeServer object to use for gathering usage data.
+            stats: the dict in which to store the statistics sent to the configured
+                endpoint. Mostly used in tests to figure out the data that is supposed to
+                be sent.
+            stats_process: statistics about resource usage of the process.
+        """
 
-    #
-    # Performance statistics. Keep this early in the function to maintain reliability of `test_performance_100` test.
-    #
-    old = stats_process[0]
-    new = (now, resource.getrusage(resource.RUSAGE_SELF))
-    stats_process[0] = new
+        logger.info("Gathering stats for reporting")
+        now = int(hs.get_clock().time())
+        # Ensure the homeserver has started.
+        assert hs.start_time is not None
+        uptime = int(now - hs.start_time)
+        if uptime < 0:
+            uptime = 0
 
-    # Get RSS in bytes
-    stats["memory_rss"] = new[1].ru_maxrss
+        #
+        # Performance statistics. Keep this early in the function to maintain reliability of `test_performance_100` test.
+        #
+        old = stats_process[0]
+        new = (now, resource.getrusage(resource.RUSAGE_SELF))
+        stats_process[0] = new
 
-    # Get CPU time in % of a single core, not % of all cores
-    used_cpu_time = (new[1].ru_utime + new[1].ru_stime) - (
-        old[1].ru_utime + old[1].ru_stime
-    )
-    if used_cpu_time == 0 or new[0] == old[0]:
-        stats["cpu_average"] = 0
-    else:
-        stats["cpu_average"] = math.floor(used_cpu_time / (new[0] - old[0]) * 100)
+        # Get RSS in bytes
+        stats["memory_rss"] = new[1].ru_maxrss
 
-    #
-    # General statistics
-    #
-
-    store = hs.get_datastores().main
-    common_metrics = await hs.get_common_usage_metrics_manager().get_metrics()
-
-    stats["homeserver"] = hs.config.server.server_name
-    stats["server_context"] = hs.config.server.server_context
-    stats["timestamp"] = now
-    stats["uptime_seconds"] = uptime
-    version = sys.version_info
-    stats["python_version"] = "{}.{}.{}".format(
-        version.major, version.minor, version.micro
-    )
-    stats["total_users"] = await store.count_all_users()
-
-    total_nonbridged_users = await store.count_nonbridged_users()
-    stats["total_nonbridged_users"] = total_nonbridged_users
-
-    daily_user_type_results = await store.count_daily_user_type()
-    for name, count in daily_user_type_results.items():
-        stats["daily_user_type_" + name] = count
-
-    room_count = await store.get_room_count()
-    stats["total_room_count"] = room_count
-
-    stats["daily_active_users"] = common_metrics.daily_active_users
-    stats["monthly_active_users"] = await store.count_monthly_users()
-    daily_active_e2ee_rooms = await store.count_daily_active_e2ee_rooms()
-    stats["daily_active_e2ee_rooms"] = daily_active_e2ee_rooms
-    stats["daily_e2ee_messages"] = await store.count_daily_e2ee_messages()
-    daily_sent_e2ee_messages = await store.count_daily_sent_e2ee_messages()
-    stats["daily_sent_e2ee_messages"] = daily_sent_e2ee_messages
-    stats["daily_active_rooms"] = await store.count_daily_active_rooms()
-    stats["daily_messages"] = await store.count_daily_messages()
-    daily_sent_messages = await store.count_daily_sent_messages()
-    stats["daily_sent_messages"] = daily_sent_messages
-
-    r30v2_results = await store.count_r30v2_users()
-    for name, count in r30v2_results.items():
-        stats["r30v2_users_" + name] = count
-
-    stats["cache_factor"] = hs.config.caches.global_factor
-    stats["event_cache_size"] = hs.config.caches.event_cache_size
-
-    #
-    # Database version
-    #
-
-    # This only reports info about the *main* database.
-    stats["database_engine"] = store.db_pool.engine.module.__name__
-    stats["database_server_version"] = store.db_pool.engine.server_version
-
-    #
-    # Logging configuration
-    #
-    synapse_logger = logging.getLogger("synapse")
-    log_level = synapse_logger.getEffectiveLevel()
-    stats["log_level"] = logging.getLevelName(log_level)
-
-    logger.info(
-        "Reporting stats to %s: %s", hs.config.metrics.report_stats_endpoint, stats
-    )
-    try:
-        await hs.get_proxied_http_client().put_json(
-            hs.config.metrics.report_stats_endpoint, stats
+        # Get CPU time in % of a single core, not % of all cores
+        used_cpu_time = (new[1].ru_utime + new[1].ru_stime) - (
+            old[1].ru_utime + old[1].ru_stime
         )
-    except Exception as e:
-        logger.warning("Error reporting stats: %s", e)
+        if used_cpu_time == 0 or new[0] == old[0]:
+            stats["cpu_average"] = 0
+        else:
+            stats["cpu_average"] = math.floor(used_cpu_time / (new[0] - old[0]) * 100)
+
+        #
+        # General statistics
+        #
+
+        store = hs.get_datastores().main
+        common_metrics = await hs.get_common_usage_metrics_manager().get_metrics()
+
+        stats["homeserver"] = hs.config.server.server_name
+        stats["server_context"] = hs.config.server.server_context
+        stats["timestamp"] = now
+        stats["uptime_seconds"] = uptime
+        version = sys.version_info
+        stats["python_version"] = "{}.{}.{}".format(
+            version.major, version.minor, version.micro
+        )
+        stats["total_users"] = await store.count_all_users()
+
+        total_nonbridged_users = await store.count_nonbridged_users()
+        stats["total_nonbridged_users"] = total_nonbridged_users
+
+        daily_user_type_results = await store.count_daily_user_type()
+        for name, count in daily_user_type_results.items():
+            stats["daily_user_type_" + name] = count
+
+        room_count = await store.get_room_count()
+        stats["total_room_count"] = room_count
+
+        stats["daily_active_users"] = common_metrics.daily_active_users
+        stats["monthly_active_users"] = await store.count_monthly_users()
+        daily_active_e2ee_rooms = await store.count_daily_active_e2ee_rooms()
+        stats["daily_active_e2ee_rooms"] = daily_active_e2ee_rooms
+        stats["daily_e2ee_messages"] = await store.count_daily_e2ee_messages()
+        daily_sent_e2ee_messages = await store.count_daily_sent_e2ee_messages()
+        stats["daily_sent_e2ee_messages"] = daily_sent_e2ee_messages
+        stats["daily_active_rooms"] = await store.count_daily_active_rooms()
+        stats["daily_messages"] = await store.count_daily_messages()
+        daily_sent_messages = await store.count_daily_sent_messages()
+        stats["daily_sent_messages"] = daily_sent_messages
+
+        r30v2_results = await store.count_r30v2_users()
+        for name, count in r30v2_results.items():
+            stats["r30v2_users_" + name] = count
+
+        stats["cache_factor"] = hs.config.caches.global_factor
+        stats["event_cache_size"] = hs.config.caches.event_cache_size
+
+        #
+        # Database version
+        #
+
+        # This only reports info about the *main* database.
+        stats["database_engine"] = store.db_pool.engine.module.__name__
+        stats["database_server_version"] = store.db_pool.engine.server_version
+
+        #
+        # Logging configuration
+        #
+        synapse_logger = logging.getLogger("synapse")
+        log_level = synapse_logger.getEffectiveLevel()
+        stats["log_level"] = logging.getLevelName(log_level)
+
+        logger.info(
+            "Reporting stats to %s: %s", hs.config.metrics.report_stats_endpoint, stats
+        )
+        try:
+            await hs.get_proxied_http_client().put_json(
+                hs.config.metrics.report_stats_endpoint, stats
+            )
+        except Exception as e:
+            logger.warning("Error reporting stats: %s", e)
+
+    return run_as_background_process(
+        "phone_stats_home", server_name, _phone_stats_home, hs, stats, stats_process
+    )
 
 
 def start_phone_stats_home(hs: "HomeServer") -> None:
     """
     Start the background tasks which report phone home stats.
     """
+    server_name = hs.hostname
     clock = hs.get_clock()
 
     stats: JsonDict = {}
@@ -210,25 +235,39 @@ def start_phone_stats_home(hs: "HomeServer") -> None:
     )
     hs.get_datastores().main.reap_monthly_active_users()
 
-    @wrap_as_background_process("generate_monthly_active_users")
-    async def generate_monthly_active_users() -> None:
-        current_mau_count = 0
-        current_mau_count_by_service: Mapping[str, int] = {}
-        reserved_users: Sized = ()
-        store = hs.get_datastores().main
-        if hs.config.server.limit_usage_by_mau or hs.config.server.mau_stats_only:
-            current_mau_count = await store.get_monthly_active_count()
-            current_mau_count_by_service = (
-                await store.get_monthly_active_count_by_service()
+    def generate_monthly_active_users() -> "defer.Deferred[None]":
+        async def _generate_monthly_active_users() -> None:
+            current_mau_count = 0
+            current_mau_count_by_service: Mapping[str, int] = {}
+            reserved_users: Sized = ()
+            store = hs.get_datastores().main
+            if hs.config.server.limit_usage_by_mau or hs.config.server.mau_stats_only:
+                current_mau_count = await store.get_monthly_active_count()
+                current_mau_count_by_service = (
+                    await store.get_monthly_active_count_by_service()
+                )
+                reserved_users = await store.get_registered_reserved_users()
+            current_mau_gauge.labels(**{SERVER_NAME_LABEL: server_name}).set(
+                float(current_mau_count)
             )
-            reserved_users = await store.get_registered_reserved_users()
-        current_mau_gauge.set(float(current_mau_count))
 
-        for app_service, count in current_mau_count_by_service.items():
-            current_mau_by_service_gauge.labels(app_service).set(float(count))
+            for app_service, count in current_mau_count_by_service.items():
+                current_mau_by_service_gauge.labels(
+                    app_service=app_service, **{SERVER_NAME_LABEL: server_name}
+                ).set(float(count))
 
-        registered_reserved_users_mau_gauge.set(float(len(reserved_users)))
-        max_mau_gauge.set(float(hs.config.server.max_mau_value))
+            registered_reserved_users_mau_gauge.labels(
+                **{SERVER_NAME_LABEL: server_name}
+            ).set(float(len(reserved_users)))
+            max_mau_gauge.labels(**{SERVER_NAME_LABEL: server_name}).set(
+                float(hs.config.server.max_mau_value)
+            )
+
+        return run_as_background_process(
+            "generate_monthly_active_users",
+            server_name,
+            _generate_monthly_active_users,
+        )
 
     if hs.config.server.limit_usage_by_mau or hs.config.server.mau_stats_only:
         generate_monthly_active_users()

synapse/appservice/__init__.py

@@ -78,7 +78,7 @@ class ApplicationService:
         self,
         token: str,
         id: str,
-        sender: str,
+        sender: UserID,
         url: Optional[str] = None,
         namespaces: Optional[JsonDict] = None,
         hs_token: Optional[str] = None,
@@ -96,6 +96,8 @@ class ApplicationService:
         self.hs_token = hs_token
         # The full Matrix ID for this application service's sender.
         self.sender = sender
+        # The application service user should be part of the server's domain.
+        self.server_name = sender.domain  # nb must be called this for @cached
         self.namespaces = self._check_namespaces(namespaces)
         self.id = id
         self.ip_range_whitelist = ip_range_whitelist
@@ -223,7 +225,7 @@ class ApplicationService:
         """
         return (
             # User is the appservice's configured sender_localpart user
-            user_id == self.sender
+            user_id == self.sender.to_string()
             # User is in the appservice's user namespace
             or self.is_user_in_namespace(user_id)
         )
@@ -347,7 +349,7 @@ class ApplicationService:
     def is_exclusive_user(self, user_id: str) -> bool:
         return (
             self._is_exclusive(ApplicationService.NS_USERS, user_id)
-            or user_id == self.sender
+            or user_id == self.sender.to_string()
         )
 
     def is_interested_in_protocol(self, protocol: str) -> bool:

synapse/appservice/api.py

@@ -48,6 +48,7 @@ from synapse.events import EventBase
 from synapse.events.utils import SerializeEventConfig, serialize_event
 from synapse.http.client import SimpleHttpClient, is_unknown_endpoint
 from synapse.logging import opentracing
+from synapse.metrics import SERVER_NAME_LABEL
 from synapse.types import DeviceListUpdates, JsonDict, JsonMapping, ThirdPartyInstanceID
 from synapse.util.caches.response_cache import ResponseCache
 
@@ -59,29 +60,31 @@ logger = logging.getLogger(__name__)
 sent_transactions_counter = Counter(
     "synapse_appservice_api_sent_transactions",
     "Number of /transactions/ requests sent",
-    ["service"],
+    labelnames=["service", SERVER_NAME_LABEL],
 )
 
 failed_transactions_counter = Counter(
     "synapse_appservice_api_failed_transactions",
     "Number of /transactions/ requests that failed to send",
-    ["service"],
+    labelnames=["service", SERVER_NAME_LABEL],
 )
 
 sent_events_counter = Counter(
-    "synapse_appservice_api_sent_events", "Number of events sent to the AS", ["service"]
+    "synapse_appservice_api_sent_events",
+    "Number of events sent to the AS",
+    labelnames=["service", SERVER_NAME_LABEL],
 )
 
 sent_ephemeral_counter = Counter(
     "synapse_appservice_api_sent_ephemeral",
     "Number of ephemeral events sent to the AS",
-    ["service"],
+    labelnames=["service", SERVER_NAME_LABEL],
 )
 
 sent_todevice_counter = Counter(
     "synapse_appservice_api_sent_todevice",
     "Number of todevice messages sent to the AS",
-    ["service"],
+    labelnames=["service", SERVER_NAME_LABEL],
 )
 
 HOUR_IN_MS = 60 * 60 * 1000
@@ -126,11 +129,15 @@ class ApplicationServiceApi(SimpleHttpClient):
 
     def __init__(self, hs: "HomeServer"):
         super().__init__(hs)
+        self.server_name = hs.hostname
         self.clock = hs.get_clock()
         self.config = hs.config.appservice
 
         self.protocol_meta_cache: ResponseCache[Tuple[str, str]] = ResponseCache(
-            hs.get_clock(), "as_protocol_meta", timeout_ms=HOUR_IN_MS
+            clock=hs.get_clock(),
+            name="as_protocol_meta",
+            server_name=self.server_name,
+            timeout_ms=HOUR_IN_MS,
         )
 
     def _get_headers(self, service: "ApplicationService") -> Dict[bytes, List[bytes]]:
@@ -378,6 +385,7 @@ class ApplicationServiceApi(SimpleHttpClient):
                     "left": list(device_list_summary.left),
                 }
 
+        labels = {"service": service.id, SERVER_NAME_LABEL: self.server_name}
         try:
             args = None
             if self.config.use_appservice_legacy_authorization:
@@ -395,10 +403,10 @@ class ApplicationServiceApi(SimpleHttpClient):
                     service.url,
                     [event.get("event_id") for event in events],
                 )
-            sent_transactions_counter.labels(service.id).inc()
-            sent_events_counter.labels(service.id).inc(len(serialized_events))
-            sent_ephemeral_counter.labels(service.id).inc(len(ephemeral))
-            sent_todevice_counter.labels(service.id).inc(len(to_device_messages))
+            sent_transactions_counter.labels(**labels).inc()
+            sent_events_counter.labels(**labels).inc(len(serialized_events))
+            sent_ephemeral_counter.labels(**labels).inc(len(ephemeral))
+            sent_todevice_counter.labels(**labels).inc(len(to_device_messages))
             return True
         except CodeMessageException as e:
             logger.warning(
@@ -417,7 +425,7 @@ class ApplicationServiceApi(SimpleHttpClient):
                 ex.args,
                 exc_info=logger.isEnabledFor(logging.DEBUG),
             )
-        failed_transactions_counter.labels(service.id).inc()
+        failed_transactions_counter.labels(**labels).inc()
         return False
 
     async def claim_client_keys(
@@ -555,6 +563,9 @@ class ApplicationServiceApi(SimpleHttpClient):
                         )
                         and service.is_interested_in_user(e.state_key)
                     ),
+                    # Appservices are considered 'trusted' by the admin and should have
+                    # applicable metadata on their events.
+                    include_admin_metadata=True,
                 ),
             )
             for e in events

synapse/appservice/scheduler.py

@@ -103,18 +103,16 @@ MAX_TO_DEVICE_MESSAGES_PER_TRANSACTION = 100
 
 
 class ApplicationServiceScheduler:
-    """Public facing API for this module. Does the required DI to tie the
-    components together. This also serves as the "event_pool", which in this
+    """
+    Public facing API for this module. Does the required dependency injection (DI) to
+    tie the components together. This also serves as the "event_pool", which in this
     case is a simple array.
     """
 
     def __init__(self, hs: "HomeServer"):
-        self.clock = hs.get_clock()
+        self.txn_ctrl = _TransactionController(hs)
         self.store = hs.get_datastores().main
-        self.as_api = hs.get_application_service_api()
-
-        self.txn_ctrl = _TransactionController(self.clock, self.store, self.as_api)
-        self.queuer = _ServiceQueuer(self.txn_ctrl, self.clock, hs)
+        self.queuer = _ServiceQueuer(self.txn_ctrl, hs)
 
     async def start(self) -> None:
         logger.info("Starting appservice scheduler")
@@ -184,9 +182,7 @@ class _ServiceQueuer:
     appservice at a given time.
     """
 
-    def __init__(
-        self, txn_ctrl: "_TransactionController", clock: Clock, hs: "HomeServer"
-    ):
+    def __init__(self, txn_ctrl: "_TransactionController", hs: "HomeServer"):
         # dict of {service_id: [events]}
         self.queued_events: Dict[str, List[EventBase]] = {}
         # dict of {service_id: [events]}
@@ -199,10 +195,11 @@ class _ServiceQueuer:
         # the appservices which currently have a transaction in flight
         self.requests_in_flight: Set[str] = set()
         self.txn_ctrl = txn_ctrl
-        self.clock = clock
         self._msc3202_transaction_extensions_enabled: bool = (
             hs.config.experimental.msc3202_transaction_extensions
         )
+        self.server_name = hs.hostname
+        self.clock = hs.get_clock()
         self._store = hs.get_datastores().main
 
     def start_background_request(self, service: ApplicationService) -> None:
@@ -210,7 +207,9 @@ class _ServiceQueuer:
         if service.id in self.requests_in_flight:
             return
 
-        run_as_background_process("as-sender", self._send_request, service)
+        run_as_background_process(
+            "as-sender", self.server_name, self._send_request, service
+        )
 
     async def _send_request(self, service: ApplicationService) -> None:
         # sanity-check: we shouldn't get here if this service already has a sender
@@ -319,7 +318,7 @@ class _ServiceQueuer:
         users: Set[str] = set()
 
         # The sender is always included
-        users.add(service.sender)
+        users.add(service.sender.to_string())
 
         # All AS users that would receive the PDUs or EDUs sent to these rooms
         # are classed as 'interesting'.
@@ -359,10 +358,11 @@ class _TransactionController:
     (Note we have only have one of these in the homeserver.)
     """
 
-    def __init__(self, clock: Clock, store: DataStore, as_api: ApplicationServiceApi):
-        self.clock = clock
-        self.store = store
-        self.as_api = as_api
+    def __init__(self, hs: "HomeServer"):
+        self.server_name = hs.hostname
+        self.clock = hs.get_clock()
+        self.store = hs.get_datastores().main
+        self.as_api = hs.get_application_service_api()
 
         # map from service id to recoverer instance
         self.recoverers: Dict[str, "_Recoverer"] = {}
@@ -446,7 +446,12 @@ class _TransactionController:
         logger.info("Starting recoverer for AS ID %s", service.id)
         assert service.id not in self.recoverers
         recoverer = self.RECOVERER_CLASS(
-            self.clock, self.store, self.as_api, service, self.on_recovered
+            self.server_name,
+            self.clock,
+            self.store,
+            self.as_api,
+            service,
+            self.on_recovered,
         )
         self.recoverers[service.id] = recoverer
         recoverer.recover()
@@ -477,21 +482,24 @@ class _Recoverer:
     We have one of these for each appservice which is currently considered DOWN.
 
     Args:
-        clock (synapse.util.Clock):
-        store (synapse.storage.DataStore):
-        as_api (synapse.appservice.api.ApplicationServiceApi):
-        service (synapse.appservice.ApplicationService): the service we are managing
-        callback (callable[_Recoverer]): called once the service recovers.
+        server_name: the homeserver name (used to label metrics) (this should be `hs.hostname`).
+        clock:
+        store:
+        as_api:
+        service: the service we are managing
+        callback: called once the service recovers.
     """
 
     def __init__(
         self,
+        server_name: str,
         clock: Clock,
         store: DataStore,
         as_api: ApplicationServiceApi,
         service: ApplicationService,
         callback: Callable[["_Recoverer"], Awaitable[None]],
     ):
+        self.server_name = server_name
         self.clock = clock
         self.store = store
         self.as_api = as_api
@@ -504,7 +512,11 @@ class _Recoverer:
         delay = 2**self.backoff_counter
         logger.info("Scheduling retries on %s in %fs", self.service.id, delay)
         self.scheduled_recovery = self.clock.call_later(
-            delay, run_as_background_process, "as-recoverer", self.retry
+            delay,
+            run_as_background_process,
+            "as-recoverer",
+            self.server_name,
+            self.retry,
         )
 
     def _backoff(self) -> None:
@@ -525,6 +537,7 @@ class _Recoverer:
         # Run a retry, which will resechedule a recovery if it fails.
         run_as_background_process(
             "retry",
+            self.server_name,
             self.retry,
         )
 

synapse/config/_base.py

@@ -909,7 +909,10 @@ class RootConfig:
 
 
 def read_config_files(config_files: Iterable[str]) -> Dict[str, Any]:
-    """Read the config files into a dict
+    """Read the config files and shallowly merge them into a dict.
+
+    Successive configurations are shallowly merged into ones provided earlier,
+    i.e., entirely replacing top-level sections of the configuration.
 
     Args:
         config_files: A list of the config files to read

synapse/config/_base.pyi

@@ -36,6 +36,7 @@ from synapse.config import (  # noqa: F401
     jwt,
     key,
     logger,
+    mas,
     metrics,
     modules,
     oembed,
@@ -124,6 +125,7 @@ class RootConfig:
     background_updates: background_updates.BackgroundUpdateConfig
     auto_accept_invites: auto_accept_invites.AutoAcceptInvitesConfig
     user_types: user_types.UserTypesConfig
+    mas: mas.MasConfig
 
     config_classes: List[Type["Config"]] = ...
     config_files: List[str]

synapse/config/appservice.py

@@ -122,8 +122,7 @@ def _load_appservice(
     localpart = as_info["sender_localpart"]
     if urlparse.quote(localpart) != localpart:
         raise ValueError("sender_localpart needs characters which are not URL encoded.")
-    user = UserID(localpart, hostname)
-    user_id = user.to_string()
+    user_id = UserID(localpart, hostname)
 
     # Rate limiting for users of this AS is on by default (excludes sender)
     rate_limited = as_info.get("rate_limited")

synapse/config/auth.py

@@ -36,13 +36,14 @@ class AuthConfig(Config):
         if password_config is None:
             password_config = {}
 
-        # The default value of password_config.enabled is True, unless msc3861 is enabled.
-        msc3861_enabled = (
-            (config.get("experimental_features") or {})
-            .get("msc3861", {})
-            .get("enabled", False)
-        )
-        passwords_enabled = password_config.get("enabled", not msc3861_enabled)
+        auth_delegated = (config.get("experimental_features") or {}).get(
+            "msc3861", {}
+        ).get("enabled", False) or (
+            config.get("matrix_authentication_service") or {}
+        ).get("enabled", False)
+
+        # The default value of password_config.enabled is True, unless auth is delegated
+        passwords_enabled = password_config.get("enabled", not auth_delegated)
 
         # 'only_for_reauth' allows users who have previously set a password to use it,
         # even though passwords would otherwise be disabled.

synapse/config/captcha.py

@@ -23,7 +23,17 @@ from typing import Any
 
 from synapse.types import JsonDict
 
-from ._base import Config, ConfigError
+from ._base import Config, ConfigError, read_file
+
+CONFLICTING_RECAPTCHA_PRIVATE_KEY_OPTS_ERROR = """\
+You have configured both `recaptcha_private_key` and
+`recaptcha_private_key_path`. These are mutually incompatible.
+"""
+
+CONFLICTING_RECAPTCHA_PUBLIC_KEY_OPTS_ERROR = """\
+You have configured both `recaptcha_public_key` and `recaptcha_public_key_path`.
+These are mutually incompatible.
+"""
 
 
 class CaptchaConfig(Config):
@@ -38,6 +48,13 @@ class CaptchaConfig(Config):
                 "Config options that expect an in-line secret as value are disabled",
                 ("recaptcha_private_key",),
             )
+        recaptcha_private_key_path = config.get("recaptcha_private_key_path")
+        if recaptcha_private_key_path:
+            if recaptcha_private_key:
+                raise ConfigError(CONFLICTING_RECAPTCHA_PRIVATE_KEY_OPTS_ERROR)
+            recaptcha_private_key = read_file(
+                recaptcha_private_key_path, ("recaptcha_private_key_path",)
+            ).strip()
         if recaptcha_private_key is not None and not isinstance(
             recaptcha_private_key, str
         ):
@@ -50,6 +67,13 @@ class CaptchaConfig(Config):
                 "Config options that expect an in-line secret as value are disabled",
                 ("recaptcha_public_key",),
             )
+        recaptcha_public_key_path = config.get("recaptcha_public_key_path")
+        if recaptcha_public_key_path:
+            if recaptcha_public_key:
+                raise ConfigError(CONFLICTING_RECAPTCHA_PUBLIC_KEY_OPTS_ERROR)
+            recaptcha_public_key = read_file(
+                recaptcha_public_key_path, ("recaptcha_public_key_path",)
+            ).strip()
         if recaptcha_public_key is not None and not isinstance(
             recaptcha_public_key, str
         ):

synapse/config/cas.py

@@ -42,6 +42,9 @@ class CasConfig(Config):
         self.cas_enabled = cas_config and cas_config.get("enabled", True)
 
         if self.cas_enabled:
+            if not isinstance(cas_config, dict):
+                raise ConfigError("Must be a dictionary", ("cas_config",))
+
             self.cas_server_url = cas_config["server_url"]
 
             # TODO Update this to a _synapse URL.

synapse/config/experimental.py

@@ -535,11 +535,15 @@ class ExperimentalConfig(Config):
             "msc4108_delegation_endpoint", None
         )
 
+        auth_delegated = self.msc3861.enabled or (
+            config.get("matrix_authentication_service") or {}
+        ).get("enabled", False)
+
         if (
             self.msc4108_enabled or self.msc4108_delegation_endpoint is not None
-        ) and not self.msc3861.enabled:
+        ) and not auth_delegated:
             raise ConfigError(
-                "MSC4108 requires MSC3861 to be enabled",
+                "MSC4108 requires MSC3861 or matrix_authentication_service to be enabled",
                 ("experimental", "msc4108_delegation_endpoint"),
             )
 
@@ -561,6 +565,12 @@ class ExperimentalConfig(Config):
         # MSC4076: Add `disable_badge_count`` to pusher configuration
         self.msc4076_enabled: bool = experimental.get("msc4076_enabled", False)
 
+        # MSC4277: Harmonizing the reporting endpoints
+        #
+        # If enabled, ignore the score parameter and respond with HTTP 200 on
+        # reporting requests regardless of the subject's existence.
+        self.msc4277_enabled: bool = experimental.get("msc4277_enabled", False)
+
         # MSC4235: Add `via` param to hierarchy endpoint
         self.msc4235_enabled: bool = experimental.get("msc4235_enabled", False)
 
@@ -575,3 +585,10 @@ class ExperimentalConfig(Config):
 
         # MSC4155: Invite filtering
         self.msc4155_enabled: bool = experimental.get("msc4155_enabled", False)
+
+        # MSC4293: Redact on Kick/Ban
+        self.msc4293_enabled: bool = experimental.get("msc4293_enabled", False)
+
+        # MSC4306: Thread Subscriptions
+        # (and MSC4308: sliding sync extension for thread subscriptions)
+        self.msc4306_enabled: bool = experimental.get("msc4306_enabled", False)

synapse/config/homeserver.py

@@ -36,6 +36,7 @@ from .federation import FederationConfig
 from .jwt import JWTConfig
 from .key import KeyConfig
 from .logger import LoggingConfig
+from .mas import MasConfig
 from .metrics import MetricsConfig
 from .modules import ModulesConfig
 from .oembed import OembedConfig
@@ -109,4 +110,6 @@ class HomeServerConfig(RootConfig):
         BackgroundUpdateConfig,
         AutoAcceptInvitesConfig,
         UserTypesConfig,
+        # This must be last, as it checks for conflicts with other config options.
+        MasConfig,
     ]

synapse/config/key.py

@@ -212,11 +212,14 @@ class KeyConfig(Config):
                 "Config options that expect an in-line secret as value are disabled",
                 ("form_secret",),
             )
+        if form_secret is not None and not isinstance(form_secret, str):
+            raise ConfigError("Config option must be a string", ("form_secret",))
+
         form_secret_path = config.get("form_secret_path", None)
         if form_secret_path:
             if form_secret:
                 raise ConfigError(CONFLICTING_FORM_SECRET_OPTS_ERROR)
-            self.form_secret = read_file(
+            self.form_secret: Optional[str] = read_file(
                 form_secret_path, ("form_secret_path",)
             ).strip()
         else:

synapse/config/mas.py

@@ -0,0 +1,192 @@
+#
+# This file is licensed under the Affero General Public License (AGPL) version 3.
+#
+# Copyright (C) 2025 New Vector, Ltd
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# See the GNU Affero General Public License for more details:
+# <https://www.gnu.org/licenses/agpl-3.0.html>.
+#
+#
+
+from typing import Any, Optional
+
+from synapse._pydantic_compat import (
+    AnyHttpUrl,
+    Field,
+    FilePath,
+    StrictBool,
+    StrictStr,
+    ValidationError,
+    validator,
+)
+from synapse.config.experimental import read_secret_from_file_once
+from synapse.types import JsonDict
+from synapse.util.pydantic_models import ParseModel
+
+from ._base import Config, ConfigError, RootConfig
+
+
+class MasConfigModel(ParseModel):
+    enabled: StrictBool = False
+    endpoint: AnyHttpUrl = Field(default="http://localhost:8080")
+    secret: Optional[StrictStr] = Field(default=None)
+    secret_path: Optional[FilePath] = Field(default=None)
+
+    @validator("secret")
+    def validate_secret_is_set_if_enabled(cls, v: Any, values: dict) -> Any:
+        if values.get("enabled", False) and not values.get("secret_path") and not v:
+            raise ValueError(
+                "You must set a `secret` or `secret_path` when enabling Matrix Authentication Service integration."
+            )
+
+        return v
+
+    @validator("secret_path")
+    def validate_secret_path_is_set_if_enabled(cls, v: Any, values: dict) -> Any:
+        if values.get("secret"):
+            raise ValueError(
+                "`secret` and `secret_path` cannot be set at the same time."
+            )
+
+        return v
+
+
+class MasConfig(Config):
+    section = "mas"
+
+    def read_config(
+        self, config: JsonDict, allow_secrets_in_config: bool, **kwargs: Any
+    ) -> None:
+        mas_config = config.get("matrix_authentication_service", {})
+        if mas_config is None:
+            mas_config = {}
+
+        try:
+            parsed = MasConfigModel(**mas_config)
+        except ValidationError as e:
+            raise ConfigError(
+                "Could not validate Matrix Authentication Service configuration",
+                path=("matrix_authentication_service",),
+            ) from e
+
+        if parsed.secret and not allow_secrets_in_config:
+            raise ConfigError(
+                "Config options that expect an in-line secret as value are disabled",
+                ("matrix_authentication_service", "secret"),
+            )
+
+        self.enabled = parsed.enabled
+        self.endpoint = parsed.endpoint
+        self._secret = parsed.secret
+        self._secret_path = parsed.secret_path
+
+        self.check_config_conflicts(self.root)
+
+    def check_config_conflicts(
+        self,
+        root: RootConfig,
+    ) -> None:
+        """Checks for any configuration conflicts with other parts of Synapse.
+
+        Raises:
+            ConfigError: If there are any configuration conflicts.
+        """
+
+        if not self.enabled:
+            return
+
+        if root.experimental.msc3861.enabled:
+            raise ConfigError(
+                "Experimental MSC3861 was replaced by Matrix Authentication Service."
+                "Please disable MSC3861 or disable Matrix Authentication Service.",
+                ("experimental", "msc3861"),
+            )
+
+        if (
+            root.auth.password_enabled_for_reauth
+            or root.auth.password_enabled_for_login
+        ):
+            raise ConfigError(
+                "Password auth cannot be enabled when OAuth delegation is enabled",
+                ("password_config", "enabled"),
+            )
+
+        if root.registration.enable_registration:
+            raise ConfigError(
+                "Registration cannot be enabled when OAuth delegation is enabled",
+                ("enable_registration",),
+            )
+
+        # We only need to test the user consent version, as if it must be set if the user_consent section was present in the config
+        if root.consent.user_consent_version is not None:
+            raise ConfigError(
+                "User consent cannot be enabled when OAuth delegation is enabled",
+                ("user_consent",),
+            )
+
+        if (
+            root.oidc.oidc_enabled
+            or root.saml2.saml2_enabled
+            or root.cas.cas_enabled
+            or root.jwt.jwt_enabled
+        ):
+            raise ConfigError("SSO cannot be enabled when OAuth delegation is enabled")
+
+        if bool(root.authproviders.password_providers):
+            raise ConfigError(
+                "Password auth providers cannot be enabled when OAuth delegation is enabled"
+            )
+
+        if root.captcha.enable_registration_captcha:
+            raise ConfigError(
+                "CAPTCHA cannot be enabled when OAuth delegation is enabled",
+                ("captcha", "enable_registration_captcha"),
+            )
+
+        if root.auth.login_via_existing_enabled:
+            raise ConfigError(
+                "Login via existing session cannot be enabled when OAuth delegation is enabled",
+                ("login_via_existing_session", "enabled"),
+            )
+
+        if root.registration.refresh_token_lifetime:
+            raise ConfigError(
+                "refresh_token_lifetime cannot be set when OAuth delegation is enabled",
+                ("refresh_token_lifetime",),
+            )
+
+        if root.registration.nonrefreshable_access_token_lifetime:
+            raise ConfigError(
+                "nonrefreshable_access_token_lifetime cannot be set when OAuth delegation is enabled",
+                ("nonrefreshable_access_token_lifetime",),
+            )
+
+        if root.registration.session_lifetime:
+            raise ConfigError(
+                "session_lifetime cannot be set when OAuth delegation is enabled",
+                ("session_lifetime",),
+            )
+
+        if root.registration.enable_3pid_changes:
+            raise ConfigError(
+                "enable_3pid_changes cannot be enabled when OAuth delegation is enabled",
+                ("enable_3pid_changes",),
+            )
+
+    def secret(self) -> str:
+        if self._secret is not None:
+            return self._secret
+        elif self._secret_path is not None:
+            return read_secret_from_file_once(
+                str(self._secret_path),
+                ("matrix_authentication_service", "secret_path"),
+            )
+        else:
+            raise RuntimeError(
+                "Neither `secret` nor `secret_path` are set, this is a bug.",
+            )

synapse/config/ratelimiting.py

@@ -241,6 +241,12 @@ class RatelimitConfig(Config):
             defaults={"per_second": 1, "burst_count": 5},
         )
 
+        self.rc_room_creation = RatelimitSettings.parse(
+            config,
+            "rc_room_creation",
+            defaults={"per_second": 0.016, "burst_count": 10},
+        )
+
         self.rc_reports = RatelimitSettings.parse(
             config,
             "rc_reports",

synapse/config/registration.py

@@ -148,15 +148,14 @@ class RegistrationConfig(Config):
         self.enable_set_displayname = config.get("enable_set_displayname", True)
         self.enable_set_avatar_url = config.get("enable_set_avatar_url", True)
 
+        auth_delegated = (config.get("experimental_features") or {}).get(
+            "msc3861", {}
+        ).get("enabled", False) or (
+            config.get("matrix_authentication_service") or {}
+        ).get("enabled", False)
+
         # The default value of enable_3pid_changes is True, unless msc3861 is enabled.
-        msc3861_enabled = (
-            (config.get("experimental_features") or {})
-            .get("msc3861", {})
-            .get("enabled", False)
-        )
-        self.enable_3pid_changes = config.get(
-            "enable_3pid_changes", not msc3861_enabled
-        )
+        self.enable_3pid_changes = config.get("enable_3pid_changes", not auth_delegated)
 
         self.disable_msisdn_registration = config.get(
             "disable_msisdn_registration", False

synapse/config/repository.py

@@ -22,11 +22,10 @@
 import logging
 import os
 from typing import Any, Dict, List, Tuple
-from urllib.request import getproxies_environment
 
 import attr
 
-from synapse.config.server import generate_ip_set
+from synapse.config.server import generate_ip_set, parse_proxy_config
 from synapse.types import JsonDict
 from synapse.util.check_dependencies import check_requirements
 from synapse.util.module_loader import load_module
@@ -61,7 +60,7 @@ THUMBNAIL_SUPPORTED_MEDIA_FORMAT_MAP = {
     "image/png": "png",
 }
 
-HTTP_PROXY_SET_WARNING = """\
+URL_PREVIEW_BLACKLIST_IGNORED_BECAUSE_HTTP_PROXY_SET_WARNING = """\
 The Synapse config url_preview_ip_range_blacklist will be ignored as an HTTP(s) proxy is configured."""
 
 
@@ -119,6 +118,15 @@ def parse_thumbnail_requirements(
     }
 
 
+@attr.s(auto_attribs=True, slots=True, frozen=True)
+class MediaUploadLimit:
+    """A limit on the amount of data a user can upload in a given time
+    period."""
+
+    max_bytes: int
+    time_period_ms: int
+
+
 class ContentRepositoryConfig(Config):
     section = "media"
 
@@ -225,17 +233,25 @@ class ContentRepositoryConfig(Config):
         if self.url_preview_enabled:
             check_requirements("url-preview")
 
-            proxy_env = getproxies_environment()
-            if "url_preview_ip_range_blacklist" not in config:
-                if "http" not in proxy_env or "https" not in proxy_env:
+            proxy_config = parse_proxy_config(config)
+            is_proxy_configured = (
+                proxy_config.http_proxy is not None
+                or proxy_config.https_proxy is not None
+            )
+            if "url_preview_ip_range_blacklist" in config:
+                if is_proxy_configured:
+                    logger.warning(
+                        "".join(
+                            URL_PREVIEW_BLACKLIST_IGNORED_BECAUSE_HTTP_PROXY_SET_WARNING
+                        )
+                    )
+            else:
+                if not is_proxy_configured:
                     raise ConfigError(
                         "For security, you must specify an explicit target IP address "
                         "blacklist in url_preview_ip_range_blacklist for url previewing "
                         "to work"
                     )
-            else:
-                if "http" in proxy_env or "https" in proxy_env:
-                    logger.warning("".join(HTTP_PROXY_SET_WARNING))
 
             # we always block '0.0.0.0' and '::', which are supposed to be
             # unroutable addresses.
@@ -274,6 +290,13 @@ class ContentRepositoryConfig(Config):
 
         self.enable_authenticated_media = config.get("enable_authenticated_media", True)
 
+        self.media_upload_limits: List[MediaUploadLimit] = []
+        for limit_config in config.get("media_upload_limits", []):
+            time_period_ms = self.parse_duration(limit_config["time_period"])
+            max_bytes = self.parse_size(limit_config["max_size"])
+
+            self.media_upload_limits.append(MediaUploadLimit(max_bytes, time_period_ms))
+
     def generate_config_section(self, data_dir_path: str, **kwargs: Any) -> str:
         assert data_dir_path is not None
         media_store = os.path.join(data_dir_path, "media_store")

synapse/config/server.py

@@ -25,11 +25,13 @@ import logging
 import os.path
 import urllib.parse
 from textwrap import indent
-from typing import Any, Dict, Iterable, List, Optional, Set, Tuple, Union
+from typing import Any, Dict, Iterable, List, Optional, Set, Tuple, TypedDict, Union
+from urllib.request import getproxies_environment
 
 import attr
 import yaml
 from netaddr import AddrFormatError, IPNetwork, IPSet
+from typing_extensions import TypeGuard
 
 from twisted.conch.ssh.keys import Key
 
@@ -43,6 +45,21 @@ from ._util import validate_config
 
 logger = logging.getLogger(__name__)
 
+
+# Directly from the mypy docs:
+# https://typing.python.org/en/latest/spec/narrowing.html#typeguard
+def is_str_list(val: Any, allow_empty: bool) -> TypeGuard[list[str]]:
+    """
+    Type-narrow a value to a list of strings (compatible with mypy).
+    """
+    if not isinstance(val, list):
+        return False
+
+    if len(val) == 0:
+        return allow_empty
+    return all(isinstance(x, str) for x in val)
+
+
 DIRECT_TCP_ERROR = """
 Using direct TCP replication for workers is no longer supported.
 
@@ -291,6 +308,102 @@ class LimitRemoteRoomsConfig:
     )
 
 
+class ProxyConfigDictionary(TypedDict):
+    """
+    Dictionary of proxy settings suitable for interacting with `urllib.request` API's
+    """
+
+    http: Optional[str]
+    """
+    Proxy server to use for HTTP requests.
+    """
+    https: Optional[str]
+    """
+    Proxy server to use for HTTPS requests.
+    """
+    no: str
+    """
+    Comma-separated list of hosts, IP addresses, or IP ranges in CIDR format which
+    should not use the proxy.
+
+    Empty string means no hosts should be excluded from the proxy.
+    """
+
+
+@attr.s(slots=True, frozen=True, auto_attribs=True)
+class ProxyConfig:
+    """
+    Synapse configuration for HTTP proxy settings.
+    """
+
+    http_proxy: Optional[str]
+    """
+    Proxy server to use for HTTP requests.
+    """
+    https_proxy: Optional[str]
+    """
+    Proxy server to use for HTTPS requests.
+    """
+    no_proxy_hosts: Optional[List[str]]
+    """
+    List of hosts, IP addresses, or IP ranges in CIDR format which should not use the
+    proxy. Synapse will directly connect to these hosts.
+    """
+
+    def get_proxies_dictionary(self) -> ProxyConfigDictionary:
+        """
+        Returns a dictionary of proxy settings suitable for interacting with
+        `urllib.request` API's (e.g. `urllib.request.proxy_bypass_environment`)
+
+        The keys are `"http"`, `"https"`, and `"no"`.
+        """
+        return ProxyConfigDictionary(
+            http=self.http_proxy,
+            https=self.https_proxy,
+            no=",".join(self.no_proxy_hosts) if self.no_proxy_hosts else "",
+        )
+
+
+def parse_proxy_config(config: JsonDict) -> ProxyConfig:
+    """
+    Figure out forward proxy config for outgoing HTTP requests.
+
+    Prefer values from the given config over the environment variables (`http_proxy`,
+    `https_proxy`, `no_proxy`, not case-sensitive).
+
+    Args:
+        config: The top-level homeserver configuration dictionary.
+    """
+    proxies_from_env = getproxies_environment()
+    http_proxy = config.get("http_proxy", proxies_from_env.get("http"))
+    if http_proxy is not None and not isinstance(http_proxy, str):
+        raise ConfigError("'http_proxy' must be a string", ("http_proxy",))
+
+    https_proxy = config.get("https_proxy", proxies_from_env.get("https"))
+    if https_proxy is not None and not isinstance(https_proxy, str):
+        raise ConfigError("'https_proxy' must be a string", ("https_proxy",))
+
+    # List of hosts which should not use the proxy. Synapse will directly connect to
+    # these hosts.
+    no_proxy_hosts = config.get("no_proxy_hosts")
+    # The `no_proxy` environment variable should be a comma-separated list of hosts,
+    # IP addresses, or IP ranges in CIDR format
+    no_proxy_from_env = proxies_from_env.get("no")
+    if no_proxy_hosts is None and no_proxy_from_env is not None:
+        no_proxy_hosts = no_proxy_from_env.split(",")
+
+    if no_proxy_hosts is not None and not is_str_list(no_proxy_hosts, allow_empty=True):
+        raise ConfigError(
+            "'no_proxy_hosts' must be a list of strings", ("no_proxy_hosts",)
+        )
+
+    return ProxyConfig(
+        http_proxy=http_proxy,
+        https_proxy=https_proxy,
+        no_proxy_hosts=no_proxy_hosts,
+    )
+
+
 class ServerConfig(Config):
     section = "server"
 
@@ -718,6 +831,17 @@ class ServerConfig(Config):
                 )
             )
 
+        # Figure out forward proxy config for outgoing HTTP requests.
+        #
+        # Prefer values from the file config over the environment variables
+        self.proxy_config = parse_proxy_config(config)
+        logger.debug(
+            "Using proxy settings: http_proxy=%s, https_proxy=%s, no_proxy=%s",
+            self.proxy_config.http_proxy,
+            self.proxy_config.https_proxy,
+            self.proxy_config.no_proxy_hosts,
+        )
+
         self.cleanup_extremities_with_dummy_events = config.get(
             "cleanup_extremities_with_dummy_events", True
         )

synapse/config/workers.py

@@ -27,8 +27,6 @@ from typing import Any, Dict, List, Optional, Union
 import attr
 
 from synapse._pydantic_compat import (
-    BaseModel,
-    Extra,
     StrictBool,
     StrictInt,
     StrictStr,
@@ -47,6 +45,7 @@ from synapse.config.server import (
     parse_listener_def,
 )
 from synapse.types import JsonDict
+from synapse.util.pydantic_models import ParseModel
 
 _DEPRECATED_WORKER_DUTY_OPTION_USED = """
 The '%s' configuration option is deprecated and will be removed in a future
@@ -90,30 +89,7 @@ def _instance_to_list_converter(obj: Union[str, List[str]]) -> List[str]:
     return obj
 
 
-class ConfigModel(BaseModel):
-    """A custom version of Pydantic's BaseModel which
-
-     - ignores unknown fields and
-     - does not allow fields to be overwritten after construction,
-
-    but otherwise uses Pydantic's default behaviour.
-
-    For now, ignore unknown fields. In the future, we could change this so that unknown
-    config values cause a ValidationError, provided the error messages are meaningful to
-    server operators.
-
-    Subclassing in this way is recommended by
-    https://pydantic-docs.helpmanual.io/usage/model_config/#change-behaviour-globally
-    """
-
-    class Config:
-        # By default, ignore fields that we don't recognise.
-        extra = Extra.ignore
-        # By default, don't allow fields to be reassigned after parsing.
-        allow_mutation = False
-
-
-class InstanceTcpLocationConfig(ConfigModel):
+class InstanceTcpLocationConfig(ParseModel):
     """The host and port to talk to an instance via HTTP replication."""
 
     host: StrictStr
@@ -129,7 +105,7 @@ class InstanceTcpLocationConfig(ConfigModel):
         return f"{self.host}:{self.port}"
 
 
-class InstanceUnixLocationConfig(ConfigModel):
+class InstanceUnixLocationConfig(ParseModel):
     """The socket file to talk to an instance via HTTP replication."""
 
     path: StrictStr
@@ -158,39 +134,47 @@ class WriterLocations:
             can only be a single instance.
         account_data: The instances that write to the account data streams. Currently
             can only be a single instance.
-        receipts: The instances that write to the receipts stream. Currently
-            can only be a single instance.
+        receipts: The instances that write to the receipts stream.
         presence: The instances that write to the presence stream. Currently
             can only be a single instance.
         push_rules: The instances that write to the push stream. Currently
             can only be a single instance.
+        device_lists: The instances that write to the device list stream.
     """
 
     events: List[str] = attr.ib(
-        default=["master"],
+        default=[MAIN_PROCESS_INSTANCE_NAME],
         converter=_instance_to_list_converter,
     )
     typing: List[str] = attr.ib(
-        default=["master"],
+        default=[MAIN_PROCESS_INSTANCE_NAME],
         converter=_instance_to_list_converter,
     )
     to_device: List[str] = attr.ib(
-        default=["master"],
+        default=[MAIN_PROCESS_INSTANCE_NAME],
         converter=_instance_to_list_converter,
     )
     account_data: List[str] = attr.ib(
-        default=["master"],
+        default=[MAIN_PROCESS_INSTANCE_NAME],
         converter=_instance_to_list_converter,
     )
     receipts: List[str] = attr.ib(
-        default=["master"],
+        default=[MAIN_PROCESS_INSTANCE_NAME],
         converter=_instance_to_list_converter,
     )
     presence: List[str] = attr.ib(
-        default=["master"],
+        default=[MAIN_PROCESS_INSTANCE_NAME],
         converter=_instance_to_list_converter,
     )
     push_rules: List[str] = attr.ib(
+        default=[MAIN_PROCESS_INSTANCE_NAME],
+        converter=_instance_to_list_converter,
+    )
+    device_lists: List[str] = attr.ib(
+        default=[MAIN_PROCESS_INSTANCE_NAME],
+        converter=_instance_to_list_converter,
+    )
+    thread_subscriptions: List[str] = attr.ib(
         default=["master"],
         converter=_instance_to_list_converter,
     )
@@ -262,10 +246,16 @@ class WorkerConfig(Config):
         if worker_replication_secret_path:
             if worker_replication_secret:
                 raise ConfigError(CONFLICTING_WORKER_REPLICATION_SECRET_OPTS_ERROR)
-            self.worker_replication_secret = read_file(
+            self.worker_replication_secret: Optional[str] = read_file(
                 worker_replication_secret_path, ("worker_replication_secret_path",)
             ).strip()
         else:
+            if worker_replication_secret is not None and not isinstance(
+                worker_replication_secret, str
+            ):
+                raise ConfigError(
+                    "Config option must be a string", ("worker_replication_secret",)
+                )
             self.worker_replication_secret = worker_replication_secret
 
         self.worker_name = config.get("worker_name", self.worker_app)
@@ -376,7 +366,10 @@ class WorkerConfig(Config):
         ):
             instances = _instance_to_list_converter(getattr(self.writers, stream))
             for instance in instances:
-                if instance != "master" and instance not in self.instance_map:
+                if (
+                    instance != MAIN_PROCESS_INSTANCE_NAME
+                    and instance not in self.instance_map
+                ):
                     raise ConfigError(
                         "Instance %r is configured to write %s but does not appear in `instance_map` config."
                         % (instance, stream)
@@ -415,6 +408,11 @@ class WorkerConfig(Config):
                 "Must only specify one instance to handle `push` messages."
             )
 
+        if len(self.writers.device_lists) == 0:
+            raise ConfigError(
+                "Must specify at least one instance to handle `device_lists` messages."
+            )
+
         self.events_shard_config = RoutableShardedWorkerHandlingConfig(
             self.writers.events
         )
@@ -437,9 +435,12 @@ class WorkerConfig(Config):
         #
         # No effort is made to ensure only a single instance of these tasks is
         # running.
-        background_tasks_instance = config.get("run_background_tasks_on") or "master"
+        background_tasks_instance = (
+            config.get("run_background_tasks_on") or MAIN_PROCESS_INSTANCE_NAME
+        )
         self.run_background_tasks = (
-            self.worker_name is None and background_tasks_instance == "master"
+            self.worker_name is None
+            and background_tasks_instance == MAIN_PROCESS_INSTANCE_NAME
         ) or self.worker_name == background_tasks_instance
 
         self.should_notify_appservices = self._should_this_worker_perform_duty(
@@ -511,9 +512,10 @@ class WorkerConfig(Config):
         # 'don't run here'.
         new_option_should_run_here = None
         if new_option_name in config:
-            designated_worker = config[new_option_name] or "master"
+            designated_worker = config[new_option_name] or MAIN_PROCESS_INSTANCE_NAME
             new_option_should_run_here = (
-                designated_worker == "master" and self.worker_name is None
+                designated_worker == MAIN_PROCESS_INSTANCE_NAME
+                and self.worker_name is None
             ) or designated_worker == self.worker_name
 
         legacy_option_should_run_here = None
@@ -610,7 +612,7 @@ class WorkerConfig(Config):
             # If no worker instances are set we check if the legacy option
             # is set, which means use the main process.
             if legacy_option:
-                worker_instances = ["master"]
+                worker_instances = [MAIN_PROCESS_INSTANCE_NAME]
 
             if self.worker_app == legacy_app_name:
                 if legacy_option:

synapse/crypto/event_signing.py

@@ -101,6 +101,9 @@ def compute_content_hash(
     event_dict.pop("outlier", None)
     event_dict.pop("destinations", None)
 
+    # N.B. no need to pop the room_id from create events in MSC4291 rooms
+    # as they shouldn't have one.
+
     event_json_bytes = encode_canonical_json(event_dict)
 
     hashed = hash_algorithm(event_json_bytes)

synapse/crypto/keyring.py

@@ -152,6 +152,8 @@ class Keyring:
     def __init__(
         self, hs: "HomeServer", key_fetchers: "Optional[Iterable[KeyFetcher]]" = None
     ):
+        self.server_name = hs.hostname
+
         if key_fetchers is None:
             # Always fetch keys from the database.
             mutable_key_fetchers: List[KeyFetcher] = [StoreKeyFetcher(hs)]
@@ -169,7 +171,8 @@ class Keyring:
         self._fetch_keys_queue: BatchingQueue[
             _FetchKeyRequest, Dict[str, Dict[str, FetchKeyResult]]
         ] = BatchingQueue(
-            "keyring_server",
+            name="keyring_server",
+            server_name=self.server_name,
             clock=hs.get_clock(),
             # The method called to fetch each key
             process_batch_callback=self._inner_fetch_key_requests,
@@ -473,8 +476,12 @@ class Keyring:
 
 class KeyFetcher(metaclass=abc.ABCMeta):
     def __init__(self, hs: "HomeServer"):
+        self.server_name = hs.hostname
         self._queue = BatchingQueue(
-            self.__class__.__name__, hs.get_clock(), self._fetch_keys
+            name=self.__class__.__name__,
+            server_name=self.server_name,
+            clock=hs.get_clock(),
+            process_batch_callback=self._fetch_keys,
         )
 
     async def get_keys(

synapse/event_auth.py

@@ -45,6 +45,7 @@ from signedjson.sign import SignatureVerifyException, verify_signed_json
 from unpaddedbase64 import decode_base64
 
 from synapse.api.constants import (
+    CREATOR_POWER_LEVEL,
     MAX_PDU_SIZE,
     EventContentFields,
     EventTypes,
@@ -64,6 +65,7 @@ from synapse.api.room_versions import (
     RoomVersion,
     RoomVersions,
 )
+from synapse.events import is_creator
 from synapse.state import CREATE_KEY
 from synapse.storage.databases.main.events_worker import EventRedactBehaviour
 from synapse.types import (
@@ -261,7 +263,8 @@ async def check_state_independent_auth_rules(
                 f"Event {event.event_id} has unexpected auth_event for {k}: {auth_event_id}",
             )
 
-        # We also need to check that the auth event itself is not rejected.
+        # 2.3 ... If there are entries which were themselves rejected under the checks performed on receipt
+        # of a PDU, reject.
         if auth_event.rejected_reason:
             raise AuthError(
                 403,
@@ -271,7 +274,7 @@ async def check_state_independent_auth_rules(
 
         auth_dict[k] = auth_event_id
 
-    # 3. If event does not have a m.room.create in its auth_events, reject.
+    # 2.4. If event does not have a m.room.create in its auth_events, reject.
     creation_event = auth_dict.get((EventTypes.Create, ""), None)
     if not creation_event:
         raise AuthError(403, "No create event in auth events")
@@ -311,13 +314,14 @@ def check_state_dependent_auth_rules(
 
     # Later code relies on there being a create event e.g _can_federate, _is_membership_change_allowed
     # so produce a more intelligible error if we don't have one.
-    if auth_dict.get(CREATE_KEY) is None:
+    create_event = auth_dict.get(CREATE_KEY)
+    if create_event is None:
         raise AuthError(
             403, f"Event {event.event_id} is missing a create event in auth_events."
         )
 
     # additional check for m.federate
-    creating_domain = get_domain_from_id(event.room_id)
+    creating_domain = get_domain_from_id(create_event.sender)
     originating_domain = get_domain_from_id(event.sender)
     if creating_domain != originating_domain:
         if not _can_federate(event, auth_dict):
@@ -470,12 +474,20 @@ def _check_create(event: "EventBase") -> None:
     if event.prev_event_ids():
         raise AuthError(403, "Create event has prev events")
 
-    # 1.2 If the domain of the room_id does not match the domain of the sender,
-    # reject.
-    sender_domain = get_domain_from_id(event.sender)
-    room_id_domain = get_domain_from_id(event.room_id)
-    if room_id_domain != sender_domain:
-        raise AuthError(403, "Creation event's room_id domain does not match sender's")
+    if event.room_version.msc4291_room_ids_as_hashes:
+        # 1.2 If the create event has a room_id, reject
+        if "room_id" in event:
+            raise AuthError(403, "Create event has a room_id")
+    else:
+        # 1.2 If the domain of the room_id does not match the domain of the sender,
+        # reject.
+        if not event.room_version.msc4291_room_ids_as_hashes:
+            sender_domain = get_domain_from_id(event.sender)
+            room_id_domain = get_domain_from_id(event.room_id)
+            if room_id_domain != sender_domain:
+                raise AuthError(
+                    403, "Creation event's room_id domain does not match sender's"
+                )
 
     # 1.3 If content.room_version is present and is not a recognised version, reject
     room_version_prop = event.content.get("room_version", "1")
@@ -492,6 +504,16 @@ def _check_create(event: "EventBase") -> None:
     ):
         raise AuthError(403, "Create event lacks a 'creator' property")
 
+    # 1.5 If the additional_creators field is present and is not an array of strings where each
+    # string is a valid user ID, reject.
+    if (
+        event.room_version.msc4289_creator_power_enabled
+        and EventContentFields.ADDITIONAL_CREATORS in event.content
+    ):
+        check_valid_additional_creators(
+            event.content[EventContentFields.ADDITIONAL_CREATORS]
+        )
+
 
 def _can_federate(event: "EventBase", auth_events: StateMap["EventBase"]) -> bool:
     creation_event = auth_events.get((EventTypes.Create, ""))
@@ -533,7 +555,13 @@ def _is_membership_change_allowed(
 
     target_user_id = event.state_key
 
-    creating_domain = get_domain_from_id(event.room_id)
+    # We need the create event in order to check if we can federate or not.
+    # If it's missing, yell loudly. Previously we only did this inside the
+    # _can_federate check.
+    create_event = auth_events.get((EventTypes.Create, ""))
+    if not create_event:
+        raise AuthError(403, "Create event missing from auth_events")
+    creating_domain = get_domain_from_id(create_event.sender)
     target_domain = get_domain_from_id(target_user_id)
     if creating_domain != target_domain:
         if not _can_federate(event, auth_events):
@@ -903,6 +931,32 @@ def _check_power_levels(
         except Exception:
             raise SynapseError(400, "Not a valid power level: %s" % (v,))
 
+    if room_version_obj.msc4289_creator_power_enabled:
+        # Enforce the creator does not appear in the users map
+        create_event = auth_events.get((EventTypes.Create, ""))
+        if not create_event:
+            raise SynapseError(
+                400, "Cannot check power levels without a create event in auth_events"
+            )
+        if create_event.sender in user_list:
+            raise SynapseError(
+                400,
+                "Creator user %s must not appear in content.users"
+                % (create_event.sender,),
+            )
+        additional_creators = create_event.content.get(
+            EventContentFields.ADDITIONAL_CREATORS, []
+        )
+        if additional_creators:
+            creators_in_user_list = set(additional_creators).intersection(
+                set(user_list)
+            )
+            if len(creators_in_user_list) > 0:
+                raise SynapseError(
+                    400,
+                    "Additional creators users must not appear in content.users",
+                )
+
     # Reject events with stringy power levels if required by room version
     if (
         event.type == EventTypes.PowerLevels
@@ -1028,6 +1082,9 @@ def get_user_power_level(user_id: str, auth_events: StateMap["EventBase"]) -> in
         "A create event in the auth events chain is required to calculate user power level correctly,"
         " but was not found. This indicates a bug"
     )
+    if create_event.room_version.msc4289_creator_power_enabled:
+        if is_creator(create_event, user_id):
+            return CREATOR_POWER_LEVEL
     power_level_event = get_power_level_event(auth_events)
     if power_level_event:
         level = power_level_event.content.get("users", {}).get(user_id)
@@ -1188,3 +1245,26 @@ def auth_types_for_event(
                 auth_types.add(key)
 
     return auth_types
+
+
+def check_valid_additional_creators(additional_creators: Any) -> None:
+    """Check if the additional_creators provided is valid according to MSC4289.
+
+    The additional_creators can be supplied from an m.room.create event or from an /upgrade request.
+
+    Raises:
+        AuthError if the additional_creators is invalid for some reason.
+    """
+    if type(additional_creators) is not list:
+        raise AuthError(400, "additional_creators must be an array")
+    for entry in additional_creators:
+        if type(entry) is not str:
+            raise AuthError(400, "entry in additional_creators is not a string")
+        if not UserID.is_valid(entry):
+            raise AuthError(400, "entry in additional_creators is not a valid user ID")
+        # UserID.is_valid doesn't actually validate everything, so check the rest manually.
+        if len(entry) > 255 or len(entry.encode("utf-8")) > 255:
+            raise AuthError(
+                400,
+                "entry in additional_creators too long",
+            )

synapse/events/__init__.py

@@ -41,10 +41,13 @@ from typing import (
 import attr
 from unpaddedbase64 import encode_base64
 
-from synapse.api.constants import EventTypes, RelationTypes
+from synapse.api.constants import EventContentFields, EventTypes, RelationTypes
 from synapse.api.room_versions import EventFormatVersions, RoomVersion, RoomVersions
 from synapse.synapse_rust.events import EventInternalMetadata
-from synapse.types import JsonDict, StrCollection
+from synapse.types import (
+    JsonDict,
+    StrCollection,
+)
 from synapse.util.caches import intern_dict
 from synapse.util.frozenutils import freeze
 
@@ -209,7 +212,6 @@ class EventBase(metaclass=abc.ABCMeta):
     content: DictProperty[JsonDict] = DictProperty("content")
     hashes: DictProperty[Dict[str, str]] = DictProperty("hashes")
     origin_server_ts: DictProperty[int] = DictProperty("origin_server_ts")
-    room_id: DictProperty[str] = DictProperty("room_id")
     sender: DictProperty[str] = DictProperty("sender")
     # TODO state_key should be Optional[str]. This is generally asserted in Synapse
     # by calling is_state() first (which ensures it is not None), but it is hard (not possible?)
@@ -224,6 +226,10 @@ class EventBase(metaclass=abc.ABCMeta):
     def event_id(self) -> str:
         raise NotImplementedError()
 
+    @property
+    def room_id(self) -> str:
+        raise NotImplementedError()
+
     @property
     def membership(self) -> str:
         return self.content["membership"]
@@ -386,6 +392,10 @@ class FrozenEvent(EventBase):
     def event_id(self) -> str:
         return self._event_id
 
+    @property
+    def room_id(self) -> str:
+        return self._dict["room_id"]
+
 
 class FrozenEventV2(EventBase):
     format_version = EventFormatVersions.ROOM_V3  # All events of this type are V2
@@ -443,6 +453,10 @@ class FrozenEventV2(EventBase):
         self._event_id = "$" + encode_base64(compute_event_reference_hash(self)[1])
         return self._event_id
 
+    @property
+    def room_id(self) -> str:
+        return self._dict["room_id"]
+
     def prev_event_ids(self) -> List[str]:
         """Returns the list of prev event IDs. The order matches the order
         specified in the event, though there is no meaning to it.
@@ -481,6 +495,67 @@ class FrozenEventV3(FrozenEventV2):
         return self._event_id
 
 
+class FrozenEventV4(FrozenEventV3):
+    """FrozenEventV4 for MSC4291 room IDs are hashes"""
+
+    format_version = EventFormatVersions.ROOM_V11_HYDRA_PLUS
+
+    """Override the room_id for m.room.create events"""
+
+    def __init__(
+        self,
+        event_dict: JsonDict,
+        room_version: RoomVersion,
+        internal_metadata_dict: Optional[JsonDict] = None,
+        rejected_reason: Optional[str] = None,
+    ):
+        super().__init__(
+            event_dict=event_dict,
+            room_version=room_version,
+            internal_metadata_dict=internal_metadata_dict,
+            rejected_reason=rejected_reason,
+        )
+        self._room_id: Optional[str] = None
+
+    @property
+    def room_id(self) -> str:
+        # if we have calculated the room ID already, don't do it again.
+        if self._room_id:
+            return self._room_id
+
+        is_create_event = self.type == EventTypes.Create and self.get_state_key() == ""
+
+        # for non-create events: use the supplied value from the JSON, as per FrozenEventV3
+        if not is_create_event:
+            self._room_id = self._dict["room_id"]
+            assert self._room_id is not None
+            return self._room_id
+
+        # for create events: calculate the room ID
+        from synapse.crypto.event_signing import compute_event_reference_hash
+
+        self._room_id = "!" + encode_base64(
+            compute_event_reference_hash(self)[1], urlsafe=True
+        )
+        return self._room_id
+
+    def auth_event_ids(self) -> StrCollection:
+        """Returns the list of auth event IDs. The order matches the order
+        specified in the event, though there is no meaning to it.
+        Returns:
+            The list of event IDs of this event's auth_events
+            Includes the creation event ID for convenience of all the codepaths
+            which expects the auth chain to include the creator ID, even though
+            it's explicitly not included on the wire. Excludes the create event
+            for the create event itself.
+        """
+        create_event_id = "$" + self.room_id[1:]
+        assert create_event_id not in self._dict["auth_events"]
+        if self.type == EventTypes.Create and self.get_state_key() == "":
+            return self._dict["auth_events"]  # should be []
+        return self._dict["auth_events"] + [create_event_id]
+
+
 def _event_type_from_format_version(
     format_version: int,
 ) -> Type[Union[FrozenEvent, FrozenEventV2, FrozenEventV3]]:
@@ -500,6 +575,8 @@ def _event_type_from_format_version(
         return FrozenEventV2
     elif format_version == EventFormatVersions.ROOM_V4_PLUS:
         return FrozenEventV3
+    elif format_version == EventFormatVersions.ROOM_V11_HYDRA_PLUS:
+        return FrozenEventV4
     else:
         raise Exception("No event format %r" % (format_version,))
 
@@ -559,6 +636,23 @@ def relation_from_event(event: EventBase) -> Optional[_EventRelation]:
     return _EventRelation(parent_id, rel_type, aggregation_key)
 
 
+def is_creator(create: EventBase, user_id: str) -> bool:
+    """
+    Return true if the provided user ID is the room creator.
+
+    This includes additional creators in MSC4289.
+    """
+    assert create.type == EventTypes.Create
+    if create.sender == user_id:
+        return True
+    if create.room_version.msc4289_creator_power_enabled:
+        additional_creators = set(
+            create.content.get(EventContentFields.ADDITIONAL_CREATORS, [])
+        )
+        return user_id in additional_creators
+    return False
+
+
 @attr.s(slots=True, frozen=True, auto_attribs=True)
 class StrippedStateEvent:
     """

synapse/events/auto_accept_invites.py

@@ -34,6 +34,7 @@ class InviteAutoAccepter:
     def __init__(self, config: AutoAcceptInvitesConfig, api: ModuleApi):
         # Keep a reference to the Module API.
         self._api = api
+        self.server_name = api.server_name
         self._config = config
 
         if not self._config.enabled:

synapse/events/builder.py

@@ -82,7 +82,8 @@ class EventBuilder:
 
     room_version: RoomVersion
 
-    room_id: str
+    # MSC4291 makes the room ID == the create event ID. This means the create event has no room_id.
+    room_id: Optional[str]
     type: str
     sender: str
 
@@ -142,7 +143,14 @@ class EventBuilder:
         Returns:
             The signed and hashed event.
         """
+        # Create events always have empty auth_events.
+        if self.type == EventTypes.Create and self.is_state() and self.state_key == "":
+            auth_event_ids = []
+
+        # Calculate auth_events for non-create events
         if auth_event_ids is None:
+            # Every non-create event must have a room ID
+            assert self.room_id is not None
             state_ids = await self._state.compute_state_after_events(
                 self.room_id,
                 prev_event_ids,
@@ -224,12 +232,31 @@ class EventBuilder:
             "auth_events": auth_events,
             "prev_events": prev_events,
             "type": self.type,
-            "room_id": self.room_id,
             "sender": self.sender,
             "content": self.content,
             "unsigned": self.unsigned,
             "depth": depth,
         }
+        if self.room_id is not None:
+            event_dict["room_id"] = self.room_id
+
+        if self.room_version.msc4291_room_ids_as_hashes:
+            # In MSC4291: the create event has no room ID as the create event ID /is/ the room ID.
+            if (
+                self.type == EventTypes.Create
+                and self.is_state()
+                and self._state_key == ""
+            ):
+                assert self.room_id is None
+            else:
+                # All other events do not reference the create event in auth_events, as the room ID
+                # /is/ the create event. However, the rest of the code (for consistency between room
+                # versions) assume that the create event remains part of the auth events. c.f. event
+                # class which automatically adds the create event when `.auth_event_ids()` is called
+                assert self.room_id is not None
+                create_event_id = "$" + self.room_id[1:]
+                auth_event_ids.remove(create_event_id)
+                event_dict["auth_events"] = auth_event_ids
 
         if self.is_state():
             event_dict["state_key"] = self._state_key
@@ -285,7 +312,7 @@ class EventBuilderFactory:
             room_version=room_version,
             type=key_values["type"],
             state_key=key_values.get("state_key"),
-            room_id=key_values["room_id"],
+            room_id=key_values.get("room_id"),
             sender=key_values["sender"],
             content=key_values.get("content", {}),
             unsigned=key_values.get("unsigned", {}),

synapse/events/utils.py

@@ -26,8 +26,8 @@ from typing import (
     Any,
     Awaitable,
     Callable,
+    Collection,
     Dict,
-    Iterable,
     List,
     Mapping,
     Match,
@@ -49,6 +49,7 @@ from synapse.api.constants import (
 )
 from synapse.api.errors import Codes, SynapseError
 from synapse.api.room_versions import RoomVersion
+from synapse.logging.opentracing import SynapseTags, set_tag, trace
 from synapse.types import JsonDict, Requester
 
 from . import EventBase, StrippedStateEvent, make_event_from_dict
@@ -176,9 +177,12 @@ def prune_event_dict(room_version: RoomVersion, event_dict: JsonDict) -> JsonDic
         if room_version.updated_redaction_rules:
             # MSC2176 rules state that create events cannot have their `content` redacted.
             new_content = event_dict["content"]
-        elif not room_version.implicit_room_creator:
+        if not room_version.implicit_room_creator:
             # Some room versions give meaning to `creator`
             add_fields("creator")
+        if room_version.msc4291_room_ids_as_hashes:
+            # room_id is not allowed on the create event as it's derived from the event ID
+            allowed_keys.remove("room_id")
 
     elif event_type == EventTypes.JoinRules:
         add_fields("join_rule")
@@ -421,11 +425,21 @@ class SerializeEventConfig:
     # False, that state will be removed from the event before it is returned.
     # Otherwise, it will be kept.
     include_stripped_room_state: bool = False
+    # When True, sets unsigned fields to help clients identify events which
+    # only server admins can see through other configuration. For example,
+    # whether an event was soft failed by the server.
+    include_admin_metadata: bool = False
 
 
 _DEFAULT_SERIALIZE_EVENT_CONFIG = SerializeEventConfig()
 
 
+def make_config_for_admin(existing: SerializeEventConfig) -> SerializeEventConfig:
+    # Set the options which are only available to server admins,
+    # and copy the rest.
+    return attr.evolve(existing, include_admin_metadata=True)
+
+
 def serialize_event(
     e: Union[JsonDict, EventBase],
     time_now_ms: int,
@@ -517,6 +531,10 @@ def serialize_event(
     if config.as_client_event:
         d = config.event_format(d)
 
+    # Ensure the room_id field is set for create events in MSC4291 rooms
+    if e.type == EventTypes.Create and e.room_version.msc4291_room_ids_as_hashes:
+        d["room_id"] = e.room_id
+
     # If the event is a redaction, the field with the redacted event ID appears
     # in a different location depending on the room version. e.redacts handles
     # fetching from the proper location; copy it to the other location for forwards-
@@ -528,6 +546,12 @@ def serialize_event(
             d["content"] = dict(d["content"])
             d["content"]["redacts"] = e.redacts
 
+    if config.include_admin_metadata:
+        if e.internal_metadata.is_soft_failed():
+            d["unsigned"]["io.element.synapse.soft_failed"] = True
+        if e.internal_metadata.policy_server_spammy:
+            d["unsigned"]["io.element.synapse.policy_server_spammy"] = True
+
     only_event_fields = config.only_event_fields
     if only_event_fields:
         if not isinstance(only_event_fields, list) or not all(
@@ -548,6 +572,7 @@ class EventClientSerializer:
 
     def __init__(self, hs: "HomeServer") -> None:
         self._store = hs.get_datastores().main
+        self._auth = hs.get_auth()
         self._add_extra_fields_to_unsigned_client_event_callbacks: List[
             ADD_EXTRA_FIELDS_TO_UNSIGNED_CLIENT_EVENT_CALLBACK
         ] = []
@@ -576,6 +601,15 @@ class EventClientSerializer:
         if not isinstance(event, EventBase):
             return event
 
+        # Force-enable server admin metadata because the only time an event with
+        # relevant metadata will be when the admin requested it via their admin
+        # client config account data. Also, it's "just" some `unsigned` fields, so
+        # shouldn't cause much in terms of problems to downstream consumers.
+        if config.requester is not None and await self._auth.is_server_admin(
+            config.requester
+        ):
+            config = make_config_for_admin(config)
+
         serialized_event = serialize_event(event, time_now, config=config)
 
         new_unsigned = {}
@@ -677,9 +711,10 @@ class EventClientSerializer:
                 "m.relations", {}
             ).update(serialized_aggregations)
 
+    @trace
     async def serialize_events(
         self,
-        events: Iterable[Union[JsonDict, EventBase]],
+        events: Collection[Union[JsonDict, EventBase]],
         time_now: int,
         *,
         config: SerializeEventConfig = _DEFAULT_SERIALIZE_EVENT_CONFIG,
@@ -698,6 +733,11 @@ class EventClientSerializer:
         Returns:
             The list of serialized events
         """
+        set_tag(
+            SynapseTags.FUNC_ARG_PREFIX + "events.length",
+            str(len(events)),
+        )
+
         return [
             await self.serialize_event(
                 event,
@@ -846,6 +886,14 @@ def strip_event(event: EventBase) -> JsonDict:
     Stripped state events can only have the `sender`, `type`, `state_key` and `content`
     properties present.
     """
+    # MSC4311: Ensure the create event is available on invites and knocks.
+    # TODO: Implement the rest of MSC4311
+    if (
+        event.room_version.msc4291_room_ids_as_hashes
+        and event.type == EventTypes.Create
+        and event.get_state_key() == ""
+    ):
+        return event.get_pdu_json()
 
     return {
         "type": event.type,

synapse/events/validator.py

@@ -183,8 +183,18 @@ class EventValidator:
         fields an event would have
         """
 
+        create_event_as_room_id = (
+            event.room_version.msc4291_room_ids_as_hashes
+            and event.type == EventTypes.Create
+            and hasattr(event, "state_key")
+            and event.state_key == ""
+        )
+
         strings = ["room_id", "sender", "type"]
 
+        if create_event_as_room_id:
+            strings.remove("room_id")
+
         if hasattr(event, "state_key"):
             strings.append("state_key")
 
@@ -192,7 +202,14 @@ class EventValidator:
             if not isinstance(getattr(event, s), str):
                 raise SynapseError(400, "Not '%s' a string type" % (s,))
 
-        RoomID.from_string(event.room_id)
+        if not create_event_as_room_id:
+            assert event.room_id is not None
+            RoomID.from_string(event.room_id)
+            if event.room_version.msc4291_room_ids_as_hashes and not RoomID.is_valid(
+                event.room_id
+            ):
+                raise SynapseError(400, f"Invalid room ID '{event.room_id}'")
+
         UserID.from_string(event.sender)
 
         if event.type == EventTypes.Message:

synapse/federation/federation_base.py

@@ -174,6 +174,7 @@ class FederationBase:
                 "Event not allowed by policy server, soft-failing %s", pdu.event_id
             )
             pdu.internal_metadata.soft_failed = True
+            pdu.internal_metadata.policy_server_spammy = True
             # Note: we don't redact the event so admins can inspect the event after the
             # fact. Other processes may redact the event, but that won't be applied to
             # the database copy of the event until the server's config requires it.
@@ -342,6 +343,21 @@ def event_from_pdu_json(pdu_json: JsonDict, room_version: RoomVersion) -> EventB
     if room_version.strict_canonicaljson:
         validate_canonicaljson(pdu_json)
 
+    # enforce that MSC4291 auth events don't include the create event.
+    # N.B. if they DO include a spurious create event, it'll fail auth checks elsewhere, so we don't
+    # need to do expensive DB lookups to find which event ID is the create event here.
+    if room_version.msc4291_room_ids_as_hashes:
+        room_id = pdu_json.get("room_id")
+        if room_id:
+            create_event_id = "$" + room_id[1:]
+            auth_events = pdu_json.get("auth_events")
+            if auth_events:
+                if create_event_id in auth_events:
+                    raise SynapseError(
+                        400,
+                        "auth_events must not contain the create event",
+                        Codes.BAD_JSON,
+                    )
     event = make_event_from_dict(pdu_json, room_version)
     return event
 

synapse/federation/federation_client.py

@@ -74,6 +74,7 @@ from synapse.federation.transport.client import SendJoinResponse
 from synapse.http.client import is_unknown_endpoint
 from synapse.http.types import QueryParams
 from synapse.logging.opentracing import SynapseTags, log_kv, set_tag, tag_args, trace
+from synapse.metrics import SERVER_NAME_LABEL
 from synapse.types import JsonDict, StrCollection, UserID, get_domain_from_id
 from synapse.types.handlers.policy_server import RECOMMENDATION_OK, RECOMMENDATION_SPAM
 from synapse.util.async_helpers import concurrently_execute
@@ -85,7 +86,9 @@ if TYPE_CHECKING:
 
 logger = logging.getLogger(__name__)
 
-sent_queries_counter = Counter("synapse_federation_client_sent_queries", "", ["type"])
+sent_queries_counter = Counter(
+    "synapse_federation_client_sent_queries", "", labelnames=["type", SERVER_NAME_LABEL]
+)
 
 
 PDU_RETRY_TIME_MS = 1 * 60 * 1000
@@ -137,13 +140,14 @@ class FederationClient(FederationBase):
         self.state = hs.get_state_handler()
         self.transport_layer = hs.get_federation_transport_client()
 
-        self.hostname = hs.hostname
+        self.server_name = hs.hostname
         self.signing_key = hs.signing_key
 
         # Cache mapping `event_id` to a tuple of the event itself and the `pull_origin`
         # (which server we pulled the event from)
         self._get_pdu_cache: ExpiringCache[str, Tuple[EventBase, str]] = ExpiringCache(
             cache_name="get_pdu_cache",
+            server_name=self.server_name,
             clock=self._clock,
             max_len=1000,
             expiry_ms=120 * 1000,
@@ -162,6 +166,7 @@ class FederationClient(FederationBase):
             Tuple[JsonDict, Sequence[JsonDict], Sequence[JsonDict], Sequence[str]],
         ] = ExpiringCache(
             cache_name="get_room_hierarchy_cache",
+            server_name=self.server_name,
             clock=self._clock,
             max_len=1000,
             expiry_ms=5 * 60 * 1000,
@@ -207,7 +212,10 @@ class FederationClient(FederationBase):
         Returns:
             The JSON object from the response
         """
-        sent_queries_counter.labels(query_type).inc()
+        sent_queries_counter.labels(
+            type=query_type,
+            **{SERVER_NAME_LABEL: self.server_name},
+        ).inc()
 
         return await self.transport_layer.make_query(
             destination,
@@ -229,7 +237,10 @@ class FederationClient(FederationBase):
         Returns:
             The JSON object from the response
         """
-        sent_queries_counter.labels("client_device_keys").inc()
+        sent_queries_counter.labels(
+            type="client_device_keys",
+            **{SERVER_NAME_LABEL: self.server_name},
+        ).inc()
         return await self.transport_layer.query_client_keys(
             destination, content, timeout
         )
@@ -240,7 +251,10 @@ class FederationClient(FederationBase):
         """Query the device keys for a list of user ids hosted on a remote
         server.
         """
-        sent_queries_counter.labels("user_devices").inc()
+        sent_queries_counter.labels(
+            type="user_devices",
+            **{SERVER_NAME_LABEL: self.server_name},
+        ).inc()
         return await self.transport_layer.query_user_devices(
             destination, user_id, timeout
         )
@@ -262,7 +276,10 @@ class FederationClient(FederationBase):
         Returns:
             The JSON object from the response
         """
-        sent_queries_counter.labels("client_one_time_keys").inc()
+        sent_queries_counter.labels(
+            type="client_one_time_keys",
+            **{SERVER_NAME_LABEL: self.server_name},
+        ).inc()
 
         # Convert the query with counts into a stable and unstable query and check
         # if attempting to claim more than 1 OTK.
@@ -1068,7 +1085,7 @@ class FederationClient(FederationBase):
             # there's some we never care about
             ev = builder.create_local_event_from_event_dict(
                 self._clock,
-                self.hostname,
+                self.server_name,
                 self.signing_key,
                 room_version=room_version,
                 event_dict=pdu_dict,

synapse/federation/federation_server.py

@@ -82,10 +82,10 @@ from synapse.logging.opentracing import (
     tag_args,
     trace,
 )
+from synapse.metrics import SERVER_NAME_LABEL
 from synapse.metrics.background_process_metrics import wrap_as_background_process
 from synapse.replication.http.federation import (
     ReplicationFederationSendEduRestServlet,
-    ReplicationGetQueryRestServlet,
 )
 from synapse.storage.databases.main.lock import Lock
 from synapse.storage.databases.main.roommember import extract_heroes_from_room_summary
@@ -105,23 +105,30 @@ TRANSACTION_CONCURRENCY_LIMIT = 10
 
 logger = logging.getLogger(__name__)
 
-received_pdus_counter = Counter("synapse_federation_server_received_pdus", "")
+received_pdus_counter = Counter(
+    "synapse_federation_server_received_pdus", "", labelnames=[SERVER_NAME_LABEL]
+)
 
-received_edus_counter = Counter("synapse_federation_server_received_edus", "")
+received_edus_counter = Counter(
+    "synapse_federation_server_received_edus", "", labelnames=[SERVER_NAME_LABEL]
+)
 
 received_queries_counter = Counter(
-    "synapse_federation_server_received_queries", "", ["type"]
+    "synapse_federation_server_received_queries",
+    "",
+    labelnames=["type", SERVER_NAME_LABEL],
 )
 
 pdu_process_time = Histogram(
     "synapse_federation_server_pdu_process_time",
     "Time taken to process an event",
+    labelnames=[SERVER_NAME_LABEL],
 )
 
 last_pdu_ts_metric = Gauge(
     "synapse_federation_last_received_pdu_time",
     "The timestamp of the last PDU which was successfully received from the given domain",
-    labelnames=("server_name",),
+    labelnames=("origin_server_name", SERVER_NAME_LABEL),
 )
 
 
@@ -160,7 +167,10 @@ class FederationServer(FederationBase):
 
         # We cache results for transaction with the same ID
         self._transaction_resp_cache: ResponseCache[Tuple[str, str]] = ResponseCache(
-            hs.get_clock(), "fed_txn_handler", timeout_ms=30000
+            clock=hs.get_clock(),
+            name="fed_txn_handler",
+            server_name=self.server_name,
+            timeout_ms=30000,
         )
 
         self.transaction_actions = TransactionActions(self.store)
@@ -170,10 +180,18 @@ class FederationServer(FederationBase):
         # We cache responses to state queries, as they take a while and often
         # come in waves.
         self._state_resp_cache: ResponseCache[Tuple[str, Optional[str]]] = (
-            ResponseCache(hs.get_clock(), "state_resp", timeout_ms=30000)
+            ResponseCache(
+                clock=hs.get_clock(),
+                name="state_resp",
+                server_name=self.server_name,
+                timeout_ms=30000,
+            )
         )
         self._state_ids_resp_cache: ResponseCache[Tuple[str, str]] = ResponseCache(
-            hs.get_clock(), "state_ids_resp", timeout_ms=30000
+            clock=hs.get_clock(),
+            name="state_ids_resp",
+            server_name=self.server_name,
+            timeout_ms=30000,
         )
 
         self._federation_metrics_domains = (
@@ -424,7 +442,9 @@ class FederationServer(FederationBase):
             report back to the sending server.
         """
 
-        received_pdus_counter.inc(len(transaction.pdus))
+        received_pdus_counter.labels(**{SERVER_NAME_LABEL: self.server_name}).inc(
+            len(transaction.pdus)
+        )
 
         origin_host, _ = parse_server_name(origin)
 
@@ -535,7 +555,9 @@ class FederationServer(FederationBase):
         )
 
         if newest_pdu_ts and origin in self._federation_metrics_domains:
-            last_pdu_ts_metric.labels(server_name=origin).set(newest_pdu_ts / 1000)
+            last_pdu_ts_metric.labels(
+                origin_server_name=origin, **{SERVER_NAME_LABEL: self.server_name}
+            ).set(newest_pdu_ts / 1000)
 
         return pdu_results
 
@@ -543,7 +565,7 @@ class FederationServer(FederationBase):
         """Process the EDUs in a received transaction."""
 
         async def _process_edu(edu_dict: JsonDict) -> None:
-            received_edus_counter.inc()
+            received_edus_counter.labels(**{SERVER_NAME_LABEL: self.server_name}).inc()
 
             edu = Edu(
                 origin=origin,
@@ -658,7 +680,10 @@ class FederationServer(FederationBase):
     async def on_query_request(
         self, query_type: str, args: Dict[str, str]
     ) -> Tuple[int, Dict[str, Any]]:
-        received_queries_counter.labels(query_type).inc()
+        received_queries_counter.labels(
+            type=query_type,
+            **{SERVER_NAME_LABEL: self.server_name},
+        ).inc()
         resp = await self.registry.on_query(query_type, args)
         return 200, resp
 
@@ -1300,9 +1325,9 @@ class FederationServer(FederationBase):
                     origin, event.event_id
                 )
                 if received_ts is not None:
-                    pdu_process_time.observe(
-                        (self._clock.time_msec() - received_ts) / 1000
-                    )
+                    pdu_process_time.labels(
+                        **{SERVER_NAME_LABEL: self.server_name}
+                    ).observe((self._clock.time_msec() - received_ts) / 1000)
 
             next = await self._get_next_nonspam_staged_event_for_room(
                 room_id, room_version
@@ -1380,7 +1405,6 @@ class FederationHandlerRegistry:
         # and use them. However we have guards before we use them to ensure that
         # we don't route to ourselves, and in monolith mode that will always be
         # the case.
-        self._get_query_client = ReplicationGetQueryRestServlet.make_client(hs)
         self._send_edu = ReplicationFederationSendEduRestServlet.make_client(hs)
 
         self.edu_handlers: Dict[str, Callable[[str, dict], Awaitable[None]]] = {}
@@ -1469,10 +1493,6 @@ class FederationHandlerRegistry:
         if handler:
             return await handler(args)
 
-        # Check if we can route it somewhere else that isn't us
-        if self._instance_name == "master":
-            return await self._get_query_client(query_type=query_type, args=args)
-
         # Uh oh, no handler! Let's raise an exception so the request returns an
         # error.
         logger.warning("No handler registered for query type %s", query_type)

synapse/federation/send_queue.py

@@ -54,7 +54,7 @@ from sortedcontainers import SortedDict
 
 from synapse.api.presence import UserPresenceState
 from synapse.federation.sender import AbstractFederationSender, FederationSender
-from synapse.metrics import LaterGauge
+from synapse.metrics import SERVER_NAME_LABEL, LaterGauge
 from synapse.replication.tcp.streams.federation import FederationStream
 from synapse.types import JsonDict, ReadReceipt, RoomStreamToken, StrCollection
 from synapse.util.metrics import Measure
@@ -113,10 +113,10 @@ class FederationRemoteSendQueue(AbstractFederationSender):
         # changes. ARGH.
         def register(name: str, queue: Sized) -> None:
             LaterGauge(
-                "synapse_federation_send_queue_%s_size" % (queue_name,),
-                "",
-                [],
-                lambda: len(queue),
+                name="synapse_federation_send_queue_%s_size" % (queue_name,),
+                desc="",
+                labelnames=[SERVER_NAME_LABEL],
+                caller=lambda: {(self.server_name,): len(queue)},
             )
 
         for queue_name in [
@@ -156,7 +156,9 @@ class FederationRemoteSendQueue(AbstractFederationSender):
 
     def _clear_queue_before_pos(self, position_to_delete: int) -> None:
         """Clear all the queues from before a given position"""
-        with Measure(self.clock, "send_queue._clear"):
+        with Measure(
+            self.clock, name="send_queue._clear", server_name=self.server_name
+        ):
             # Delete things out of presence maps
             keys = self.presence_destinations.keys()
             i = self.presence_destinations.bisect_left(position_to_delete)

synapse/federation/sender/__init__.py

@@ -160,6 +160,7 @@ from synapse.federation.sender.transaction_manager import TransactionManager
 from synapse.federation.units import Edu
 from synapse.logging.context import make_deferred_yieldable, run_in_background
 from synapse.metrics import (
+    SERVER_NAME_LABEL,
     LaterGauge,
     event_processing_loop_counter,
     event_processing_loop_room_count,
@@ -189,11 +190,13 @@ logger = logging.getLogger(__name__)
 sent_pdus_destination_dist_count = Counter(
     "synapse_federation_client_sent_pdu_destinations_count",
     "Number of PDUs queued for sending to one or more destinations",
+    labelnames=[SERVER_NAME_LABEL],
 )
 
 sent_pdus_destination_dist_total = Counter(
     "synapse_federation_client_sent_pdu_destinations",
     "Total number of PDUs queued for sending across all destinations",
+    labelnames=[SERVER_NAME_LABEL],
 )
 
 # Time (in s) to wait before trying to wake up destinations that have
@@ -296,6 +299,7 @@ class _DestinationWakeupQueue:
 
     Staggers waking up of per destination queues to ensure that we don't attempt
     to start TLS connections with many hosts all at once, leading to pinned CPU.
+
     """
 
     # The maximum duration in seconds between queuing up a destination and it
@@ -303,6 +307,10 @@ class _DestinationWakeupQueue:
     _MAX_TIME_IN_QUEUE = 30.0
 
     sender: "FederationSender" = attr.ib()
+    server_name: str = attr.ib()
+    """
+    Our homeserver name (used to label metrics) (`hs.hostname`).
+    """
     clock: Clock = attr.ib()
     max_delay_s: int = attr.ib()
 
@@ -391,31 +399,37 @@ class FederationSender(AbstractFederationSender):
         self._per_destination_queues: Dict[str, PerDestinationQueue] = {}
 
         LaterGauge(
-            "synapse_federation_transaction_queue_pending_destinations",
-            "",
-            [],
-            lambda: sum(
-                1
-                for d in self._per_destination_queues.values()
-                if d.transmission_loop_running
-            ),
+            name="synapse_federation_transaction_queue_pending_destinations",
+            desc="",
+            labelnames=[SERVER_NAME_LABEL],
+            caller=lambda: {
+                (self.server_name,): sum(
+                    1
+                    for d in self._per_destination_queues.values()
+                    if d.transmission_loop_running
+                )
+            },
         )
 
         LaterGauge(
-            "synapse_federation_transaction_queue_pending_pdus",
-            "",
-            [],
-            lambda: sum(
-                d.pending_pdu_count() for d in self._per_destination_queues.values()
-            ),
+            name="synapse_federation_transaction_queue_pending_pdus",
+            desc="",
+            labelnames=[SERVER_NAME_LABEL],
+            caller=lambda: {
+                (self.server_name,): sum(
+                    d.pending_pdu_count() for d in self._per_destination_queues.values()
+                )
+            },
         )
         LaterGauge(
-            "synapse_federation_transaction_queue_pending_edus",
-            "",
-            [],
-            lambda: sum(
-                d.pending_edu_count() for d in self._per_destination_queues.values()
-            ),
+            name="synapse_federation_transaction_queue_pending_edus",
+            desc="",
+            labelnames=[SERVER_NAME_LABEL],
+            caller=lambda: {
+                (self.server_name,): sum(
+                    d.pending_edu_count() for d in self._per_destination_queues.values()
+                )
+            },
         )
 
         self._is_processing = False
@@ -427,7 +441,7 @@ class FederationSender(AbstractFederationSender):
             1.0 / hs.config.ratelimiting.federation_rr_transactions_per_room_per_second
         )
         self._destination_wakeup_queue = _DestinationWakeupQueue(
-            self, self.clock, max_delay_s=rr_txn_interval_per_room_s
+            self, self.server_name, self.clock, max_delay_s=rr_txn_interval_per_room_s
         )
 
         # Regularly wake up destinations that have outstanding PDUs to be caught up
@@ -435,6 +449,7 @@ class FederationSender(AbstractFederationSender):
             run_as_background_process,
             WAKEUP_RETRY_PERIOD_SEC * 1000.0,
             "wake_destinations_needing_catchup",
+            self.server_name,
             self._wake_destinations_needing_catchup,
         )
 
@@ -477,7 +492,9 @@ class FederationSender(AbstractFederationSender):
 
         # fire off a processing loop in the background
         run_as_background_process(
-            "process_event_queue_for_federation", self._process_event_queue_loop
+            "process_event_queue_for_federation",
+            self.server_name,
+            self._process_event_queue_loop,
         )
 
     async def _process_event_queue_loop(self) -> None:
@@ -650,14 +667,19 @@ class FederationSender(AbstractFederationSender):
                         ts = event_to_received_ts[event.event_id]
                         assert ts is not None
                         synapse.metrics.event_processing_lag_by_event.labels(
-                            "federation_sender"
+                            name="federation_sender",
+                            **{SERVER_NAME_LABEL: self.server_name},
                         ).observe((now - ts) / 1000)
 
                 async def handle_room_events(events: List[EventBase]) -> None:
                     logger.debug(
                         "Handling %i events in room %s", len(events), events[0].room_id
                     )
-                    with Measure(self.clock, "handle_room_events"):
+                    with Measure(
+                        self.clock,
+                        name="handle_room_events",
+                        server_name=self.server_name,
+                    ):
                         for event in events:
                             await handle_event(event)
 
@@ -690,22 +712,30 @@ class FederationSender(AbstractFederationSender):
                     assert ts is not None
 
                     synapse.metrics.event_processing_lag.labels(
-                        "federation_sender"
+                        name="federation_sender",
+                        **{SERVER_NAME_LABEL: self.server_name},
                     ).set(now - ts)
                     synapse.metrics.event_processing_last_ts.labels(
-                        "federation_sender"
+                        name="federation_sender",
+                        **{SERVER_NAME_LABEL: self.server_name},
                     ).set(ts)
 
-                    events_processed_counter.inc(len(event_entries))
+                    events_processed_counter.labels(
+                        **{SERVER_NAME_LABEL: self.server_name}
+                    ).inc(len(event_entries))
 
-                    event_processing_loop_room_count.labels("federation_sender").inc(
-                        len(events_by_room)
-                    )
+                    event_processing_loop_room_count.labels(
+                        name="federation_sender",
+                        **{SERVER_NAME_LABEL: self.server_name},
+                    ).inc(len(events_by_room))
 
-                event_processing_loop_counter.labels("federation_sender").inc()
+                event_processing_loop_counter.labels(
+                    name="federation_sender",
+                    **{SERVER_NAME_LABEL: self.server_name},
+                ).inc()
 
                 synapse.metrics.event_processing_positions.labels(
-                    "federation_sender"
+                    name="federation_sender", **{SERVER_NAME_LABEL: self.server_name}
                 ).set(next_token)
 
         finally:
@@ -723,8 +753,12 @@ class FederationSender(AbstractFederationSender):
         if not destinations:
             return
 
-        sent_pdus_destination_dist_total.inc(len(destinations))
-        sent_pdus_destination_dist_count.inc()
+        sent_pdus_destination_dist_total.labels(
+            **{SERVER_NAME_LABEL: self.server_name}
+        ).inc(len(destinations))
+        sent_pdus_destination_dist_count.labels(
+            **{SERVER_NAME_LABEL: self.server_name}
+        ).inc()
 
         assert pdu.internal_metadata.stream_ordering
 

synapse/federation/sender/per_destination_queue.py

@@ -40,7 +40,7 @@ from synapse.federation.units import Edu
 from synapse.handlers.presence import format_user_presence_state
 from synapse.logging import issue9533_logger
 from synapse.logging.opentracing import SynapseTags, set_tag
-from synapse.metrics import sent_transactions_counter
+from synapse.metrics import SERVER_NAME_LABEL, sent_transactions_counter
 from synapse.metrics.background_process_metrics import run_as_background_process
 from synapse.types import JsonDict, ReadReceipt
 from synapse.util.retryutils import NotRetryingDestination, get_retry_limiter
@@ -56,13 +56,15 @@ logger = logging.getLogger(__name__)
 
 
 sent_edus_counter = Counter(
-    "synapse_federation_client_sent_edus", "Total number of EDUs successfully sent"
+    "synapse_federation_client_sent_edus",
+    "Total number of EDUs successfully sent",
+    labelnames=[SERVER_NAME_LABEL],
 )
 
 sent_edus_by_type = Counter(
     "synapse_federation_client_sent_edus_by_type",
     "Number of sent EDUs successfully sent, by event type",
-    ["type"],
+    labelnames=["type", SERVER_NAME_LABEL],
 )
 
 
@@ -91,7 +93,7 @@ class PerDestinationQueue:
         transaction_manager: "synapse.federation.sender.TransactionManager",
         destination: str,
     ):
-        self._server_name = hs.hostname
+        self.server_name = hs.hostname
         self._clock = hs.get_clock()
         self._storage_controllers = hs.get_storage_controllers()
         self._store = hs.get_datastores().main
@@ -129,6 +131,8 @@ class PerDestinationQueue:
 
         # The stream_ordering of the most recent PDU that was discarded due to
         # being in catch-up mode.
+        # Can be set to zero if no PDU has been discarded since the last time
+        # we queried for new PDUs during catch-up.
         self._catchup_last_skipped: int = 0
 
         # Cache of the last successfully-transmitted stream ordering for this
@@ -309,6 +313,7 @@ class PerDestinationQueue:
 
         run_as_background_process(
             "federation_transaction_transmission_loop",
+            self.server_name,
             self._transaction_transmission_loop,
         )
 
@@ -320,7 +325,12 @@ class PerDestinationQueue:
             # This will throw if we wouldn't retry. We do this here so we fail
             # quickly, but we will later check this again in the http client,
             # hence why we throw the result away.
-            await get_retry_limiter(self._destination, self._clock, self._store)
+            await get_retry_limiter(
+                destination=self._destination,
+                our_server_name=self.server_name,
+                clock=self._clock,
+                store=self._store,
+            )
 
             if self._catching_up:
                 # we potentially need to catch-up first
@@ -360,10 +370,17 @@ class PerDestinationQueue:
                         self._destination, pending_pdus, pending_edus
                     )
 
-                    sent_transactions_counter.inc()
-                    sent_edus_counter.inc(len(pending_edus))
+                    sent_transactions_counter.labels(
+                        **{SERVER_NAME_LABEL: self.server_name}
+                    ).inc()
+                    sent_edus_counter.labels(
+                        **{SERVER_NAME_LABEL: self.server_name}
+                    ).inc(len(pending_edus))
                     for edu in pending_edus:
-                        sent_edus_by_type.labels(edu.edu_type).inc()
+                        sent_edus_by_type.labels(
+                            type=edu.edu_type,
+                            **{SERVER_NAME_LABEL: self.server_name},
+                        ).inc()
 
         except NotRetryingDestination as e:
             logger.debug(
@@ -462,8 +479,18 @@ class PerDestinationQueue:
                 # of a race condition, so we check that no new events have been
                 # skipped due to us being in catch-up mode
 
-                if self._catchup_last_skipped > last_successful_stream_ordering:
+                if (
+                    self._catchup_last_skipped != 0
+                    and self._catchup_last_skipped > last_successful_stream_ordering
+                ):
                     # another event has been skipped because we were in catch-up mode
+                    # As an exception to this case: we can hit this branch if the
+                    # room has been purged whilst we have been looping.
+                    # In that case we avoid hot-looping by resetting the 'catch-up skipped
+                    # PDU' flag.
+                    # Then if there is still no progress to be made at the next iteration,
+                    # we can exit catch-up mode.
+                    self._catchup_last_skipped = 0
                     continue
 
                 # we are done catching up!
@@ -554,7 +581,7 @@ class PerDestinationQueue:
                     new_pdus = await filter_events_for_server(
                         self._storage_controllers,
                         self._destination,
-                        self._server_name,
+                        self.server_name,
                         new_pdus,
                         redact=False,
                         filter_out_erased_senders=True,
@@ -578,7 +605,9 @@ class PerDestinationQueue:
                     self._destination, room_catchup_pdus, []
                 )
 
-                sent_transactions_counter.inc()
+                sent_transactions_counter.labels(
+                    **{SERVER_NAME_LABEL: self.server_name}
+                ).inc()
 
                 # We pulled this from the DB, so it'll be non-null
                 assert pdu.internal_metadata.stream_ordering
@@ -601,7 +630,7 @@ class PerDestinationQueue:
         # Send at most limit EDUs for receipts.
         for content in self._pending_receipt_edus[:limit]:
             yield Edu(
-                origin=self._server_name,
+                origin=self.server_name,
                 destination=self._destination,
                 edu_type=EduTypes.RECEIPT,
                 content=content,
@@ -627,7 +656,7 @@ class PerDestinationQueue:
         )
         edus = [
             Edu(
-                origin=self._server_name,
+                origin=self.server_name,
                 destination=self._destination,
                 edu_type=edu_type,
                 content=content,
@@ -654,7 +683,7 @@ class PerDestinationQueue:
 
         edus = [
             Edu(
-                origin=self._server_name,
+                origin=self.server_name,
                 destination=self._destination,
                 edu_type=EduTypes.DIRECT_TO_DEVICE,
                 content=content,
@@ -727,7 +756,7 @@ class _TransactionQueueManager:
 
             pending_edus.append(
                 Edu(
-                    origin=self.queue._server_name,
+                    origin=self.queue.server_name,
                     destination=self.queue._destination,
                     edu_type=EduTypes.PRESENCE,
                     content={"push": presence_to_add},

synapse/federation/sender/transaction_manager.py

@@ -34,6 +34,7 @@ from synapse.logging.opentracing import (
     tags,
     whitelisted_homeserver,
 )
+from synapse.metrics import SERVER_NAME_LABEL
 from synapse.types import JsonDict
 from synapse.util import json_decoder
 from synapse.util.metrics import measure_func
@@ -47,7 +48,7 @@ issue_8631_logger = logging.getLogger("synapse.8631_debug")
 last_pdu_ts_metric = Gauge(
     "synapse_federation_last_sent_pdu_time",
     "The timestamp of the last PDU which was successfully sent to the given domain",
-    labelnames=("server_name",),
+    labelnames=("destination_server_name", SERVER_NAME_LABEL),
 )
 
 
@@ -58,7 +59,7 @@ class TransactionManager:
     """
 
     def __init__(self, hs: "synapse.server.HomeServer"):
-        self._server_name = hs.hostname
+        self.server_name = hs.hostname  # nb must be called this for @measure_func
         self.clock = hs.get_clock()  # nb must be called this for @measure_func
         self._store = hs.get_datastores().main
         self._transaction_actions = TransactionActions(self._store)
@@ -116,7 +117,7 @@ class TransactionManager:
             transaction = Transaction(
                 origin_server_ts=int(self.clock.time_msec()),
                 transaction_id=txn_id,
-                origin=self._server_name,
+                origin=self.server_name,
                 destination=destination,
                 pdus=[p.get_pdu_json() for p in pdus],
                 edus=[edu.get_dict() for edu in edus],
@@ -191,6 +192,7 @@ class TransactionManager:
 
             if pdus and destination in self._federation_metrics_domains:
                 last_pdu = pdus[-1]
-                last_pdu_ts_metric.labels(server_name=destination).set(
-                    last_pdu.origin_server_ts / 1000
-                )
+                last_pdu_ts_metric.labels(
+                    destination_server_name=destination,
+                    **{SERVER_NAME_LABEL: self.server_name},
+                ).set(last_pdu.origin_server_ts / 1000)

synapse/handlers/account_validity.py

@@ -38,6 +38,9 @@ logger = logging.getLogger(__name__)
 class AccountValidityHandler:
     def __init__(self, hs: "HomeServer"):
         self.hs = hs
+        self.server_name = (
+            hs.hostname
+        )  # nb must be called this for @wrap_as_background_process
         self.config = hs.config
         self.store = hs.get_datastores().main
         self.send_email_handler = hs.get_send_email_handler()

synapse/handlers/admin.py

@@ -358,6 +358,7 @@ class AdminHandler:
         user_id: str,
         rooms: list,
         requester: JsonMapping,
+        use_admin: bool,
         reason: Optional[str],
         limit: Optional[int],
     ) -> str:
@@ -368,6 +369,7 @@ class AdminHandler:
             user_id: the user ID of the user whose events should be redacted
             rooms: the rooms in which to redact the user's events
             requester: the user requesting the events
+            use_admin: whether to use the admin account to issue the redactions
             reason: reason for requesting the redaction, ie spam, etc
             limit: limit on the number of events in each room to redact
 
@@ -395,6 +397,7 @@ class AdminHandler:
                 "rooms": rooms,
                 "requester": requester,
                 "user_id": user_id,
+                "use_admin": use_admin,
                 "reason": reason,
                 "limit": limit,
             },
@@ -426,9 +429,17 @@ class AdminHandler:
         user_id = task.params.get("user_id")
         assert user_id is not None
 
-        # puppet the user if they're ours, otherwise use admin to redact
+        use_admin = task.params.get("use_admin", False)
+
+        # default to puppeting the user unless they are not local or it's been requested to
+        # use the admin user to issue the redactions
+        requester_id = (
+            admin.user.to_string()
+            if use_admin or not self.hs.is_mine_id(user_id)
+            else user_id
+        )
         requester = create_requester(
-            user_id if self.hs.is_mine_id(user_id) else admin.user.to_string(),
+            requester_id,
             authenticated_entity=admin.user.to_string(),
         )
 

synapse/handlers/appservice.py

@@ -42,6 +42,7 @@ from synapse.events import EventBase
 from synapse.handlers.presence import format_user_presence_state
 from synapse.logging.context import make_deferred_yieldable, run_in_background
 from synapse.metrics import (
+    SERVER_NAME_LABEL,
     event_processing_loop_counter,
     event_processing_loop_room_count,
 )
@@ -68,11 +69,16 @@ if TYPE_CHECKING:
 
 logger = logging.getLogger(__name__)
 
-events_processed_counter = Counter("synapse_handlers_appservice_events_processed", "")
+events_processed_counter = Counter(
+    "synapse_handlers_appservice_events_processed", "", labelnames=[SERVER_NAME_LABEL]
+)
 
 
 class ApplicationServicesHandler:
     def __init__(self, hs: "HomeServer"):
+        self.server_name = (
+            hs.hostname
+        )  # nb must be called this for @wrap_as_background_process
         self.store = hs.get_datastores().main
         self.is_mine_id = hs.is_mine_id
         self.appservice_api = hs.get_application_service_api()
@@ -120,7 +126,9 @@ class ApplicationServicesHandler:
 
     @wrap_as_background_process("notify_interested_services")
     async def _notify_interested_services(self, max_token: RoomStreamToken) -> None:
-        with Measure(self.clock, "notify_interested_services"):
+        with Measure(
+            self.clock, name="notify_interested_services", server_name=self.server_name
+        ):
             self.is_processing = True
             try:
                 upper_bound = -1
@@ -163,7 +171,9 @@ class ApplicationServicesHandler:
                                 except Exception:
                                     logger.error("Application Services Failure")
 
-                            run_as_background_process("as_scheduler", start_scheduler)
+                            run_as_background_process(
+                                "as_scheduler", self.server_name, start_scheduler
+                            )
                             self.started_scheduler = True
 
                         # Fork off pushes to these services
@@ -177,7 +187,8 @@ class ApplicationServicesHandler:
                         assert ts is not None
 
                         synapse.metrics.event_processing_lag_by_event.labels(
-                            "appservice_sender"
+                            name="appservice_sender",
+                            **{SERVER_NAME_LABEL: self.server_name},
                         ).observe((now - ts) / 1000)
 
                     async def handle_room_events(events: Iterable[EventBase]) -> None:
@@ -197,16 +208,23 @@ class ApplicationServicesHandler:
                     await self.store.set_appservice_last_pos(upper_bound)
 
                     synapse.metrics.event_processing_positions.labels(
-                        "appservice_sender"
+                        name="appservice_sender",
+                        **{SERVER_NAME_LABEL: self.server_name},
                     ).set(upper_bound)
 
-                    events_processed_counter.inc(len(events))
+                    events_processed_counter.labels(
+                        **{SERVER_NAME_LABEL: self.server_name}
+                    ).inc(len(events))
 
-                    event_processing_loop_room_count.labels("appservice_sender").inc(
-                        len(events_by_room)
-                    )
+                    event_processing_loop_room_count.labels(
+                        name="appservice_sender",
+                        **{SERVER_NAME_LABEL: self.server_name},
+                    ).inc(len(events_by_room))
 
-                    event_processing_loop_counter.labels("appservice_sender").inc()
+                    event_processing_loop_counter.labels(
+                        name="appservice_sender",
+                        **{SERVER_NAME_LABEL: self.server_name},
+                    ).inc()
 
                     if events:
                         now = self.clock.time_msec()
@@ -214,10 +232,12 @@ class ApplicationServicesHandler:
                         assert ts is not None
 
                         synapse.metrics.event_processing_lag.labels(
-                            "appservice_sender"
+                            name="appservice_sender",
+                            **{SERVER_NAME_LABEL: self.server_name},
                         ).set(now - ts)
                         synapse.metrics.event_processing_last_ts.labels(
-                            "appservice_sender"
+                            name="appservice_sender",
+                            **{SERVER_NAME_LABEL: self.server_name},
                         ).set(ts)
             finally:
                 self.is_processing = False
@@ -329,7 +349,11 @@ class ApplicationServicesHandler:
         users: Collection[Union[str, UserID]],
     ) -> None:
         logger.debug("Checking interested services for %s", stream_key)
-        with Measure(self.clock, "notify_interested_services_ephemeral"):
+        with Measure(
+            self.clock,
+            name="notify_interested_services_ephemeral",
+            server_name=self.server_name,
+        ):
             for service in services:
                 if stream_key == StreamKeyType.TYPING:
                     # Note that we don't persist the token (via set_appservice_stream_type_pos)
@@ -631,7 +655,8 @@ class ApplicationServicesHandler:
 
         # Fetch the users who have modified their device list since then.
         users_with_changed_device_lists = await self.store.get_all_devices_changed(
-            from_key, to_key=new_key
+            MultiWriterStreamToken(stream=from_key),
+            to_key=MultiWriterStreamToken(stream=new_key),
         )
 
         # Filter out any users the application service is not interested in
@@ -839,7 +864,7 @@ class ApplicationServicesHandler:
 
         # user not found; could be the AS though, so check.
         services = self.store.get_app_services()
-        service_list = [s for s in services if s.sender == user_id]
+        service_list = [s for s in services if s.sender.to_string() == user_id]
         return len(service_list) == 0
 
     async def _check_user_exists(self, user_id: str) -> bool: