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Add the rust_sliding_sync option and a Rust SlidingSyncHandler

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Phase 0 of the sliding sync port (renders/sliding-sync-rust-plan.md). No
behaviour change: nothing calls the Rust handler yet.

- `experimental_features.rust_sliding_sync: off | on`. There is no shadow
  mode. Booleans are accepted, as for `rust_sync`.
- `synapse_rust.sliding_sync.SlidingSyncHandler`, built by `RustHandlers`
  on the native driver only. It shares the v2 sync handler's `SyncStore`
  and carries the pool, deferred and blocking helpers the later phases'
  entry points use.
- `SlidingSyncStats`, observed per request into the
  `synapse_sliding_sync_rust_*` histograms. `SyncDbStats` now counts the
  transactions a reader begins.
- The `synapse_sliding_sync_rust_rooms_total` and
  `synapse_sliding_sync_rust_requests_total` counters.
- `SYNAPSE_TEST_RUST_SLIDING_SYNC` and `_STRICT` for trial, with the handler
  wrapped in `_BlockingRustCalls`, and `RUST_SLIDING_SYNC` for Complement.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01R5b7Ruy4cgt27Mjq6Ptxbb
This commit is contained in:
Erik JohnstonandClaude Opus 5.5 committed 2026-10-16 10:19:27 +00:00
1 parent a78b02b55c
commit d63740fc30
15 files changed
+554 -24
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docker/complement/conf/start_for_complement.sh
+6 -1
View File
@@ -6,7 +6,7 @@ set -e
echo "Complement Synapse launcher"
echo " Args: $*"
echo " Env: SYNAPSE_COMPLEMENT_DATABASE=$SYNAPSE_COMPLEMENT_DATABASE SYNAPSE_COMPLEMENT_USE_WORKERS=$SYNAPSE_COMPLEMENT_USE_WORKERS SYNAPSE_COMPLEMENT_USE_ASYNCIO_REACTOR=$SYNAPSE_COMPLEMENT_USE_ASYNCIO_REACTOR SYNAPSE_USE_RUST_DRIVER=$SYNAPSE_USE_RUST_DRIVER SYNAPSE_RUST_STATE_RES=$SYNAPSE_RUST_STATE_RES SYNAPSE_RUST_SYNC=$SYNAPSE_RUST_SYNC"
echo " Env: SYNAPSE_COMPLEMENT_DATABASE=$SYNAPSE_COMPLEMENT_DATABASE SYNAPSE_COMPLEMENT_USE_WORKERS=$SYNAPSE_COMPLEMENT_USE_WORKERS SYNAPSE_COMPLEMENT_USE_ASYNCIO_REACTOR=$SYNAPSE_COMPLEMENT_USE_ASYNCIO_REACTOR SYNAPSE_USE_RUST_DRIVER=$SYNAPSE_USE_RUST_DRIVER SYNAPSE_RUST_STATE_RES=$SYNAPSE_RUST_STATE_RES SYNAPSE_RUST_SYNC=$SYNAPSE_RUST_SYNC SYNAPSE_RUST_SLIDING_SYNC=$SYNAPSE_RUST_SLIDING_SYNC"
function log {
d=$(printf '%(%Y-%m-%d %H:%M:%S)T,%.3s\n' ${EPOCHREALTIME/./ })
@@ -141,6 +141,11 @@ if [[ -n "$SYNAPSE_RUST_SYNC" ]]; then
sed -i "s/^experimental_features:$/experimental_features:\n rust_sync: \"$SYNAPSE_RUST_SYNC\"/" /conf/shared.yaml.j2
fi
# Compute sliding sync responses in Rust (`experimental_features.rust_sliding_sync`).
if [[ -n "$SYNAPSE_RUST_SLIDING_SYNC" ]]; then
sed -i "s/^experimental_features:$/experimental_features:\n rust_sliding_sync: \"$SYNAPSE_RUST_SLIDING_SYNC\"/" /conf/shared.yaml.j2
fi
# Add a directory for tests to add config overrides if they want
mkdir --parents /conf/homeserver.d
export _SYNAPSE_COMPLEMENT_EXTRA_CONFIG_DIR=/conf/homeserver.d