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Erik JohnstonandClaude Opus 5.5 a05a064643 Add the Rust event persister and what it builds on

Phase 0 of the event persistence plan, apart from the write transaction
helper:

- `experimental_features.rust_event_persistence`, one ordered level
  (off, shadow, prepare, transaction, full). Nothing uses the levels yet
  beyond building the persister.
- `RustHandlers.persister`: built on the events writer when the level is not
  off and the main database uses the native driver. It holds the pool, the
  shared caches and the events, backfill and cache stream trackers.
- `PersistEffects`, the Python cache updates a Rust transaction will ask for
  in place of `txn.call_after`, applied in one call by
  `DataStore._apply_rust_persist_effects`. A test persists batches through
  Python and checks that applying the matching effects updates the same
  caches. The chunk's stream IDs come back unfinished and are finished last,
  as Python's `get_next_mult` does after the transaction's callbacks, so
  the current token never passes an event the stream change caches don't
  know about.
- `PersistContext`, read from an `EventContext` once per event.
- `Event::to_persistence_value` and `EventInternalMetadata::to_persistence_value`:
  the `event_json` columns built without the GIL.
- Rust-side persistence counters, added to the Python metrics by a pre-collect
  hook. A homeserver can now register more than one such hook. The persisted
  position is reported only when it moved, so it can't pull back the gauge
  the Python path sets.
- `SYNAPSE_TEST_RUST_PERSIST` for trial and `RUST_PERSIST` for Complement.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UHKYPSc37kWqGACn9aKxKL

2026-10-16 13:06:06 +00:00

conf

Add the Rust event persister and what it builds on

2026-10-16 13:06:06 +00:00

Dockerfile

Remove support for PostgreSQL 13 (#19170 )

2025-11-13 19:38:59 +00:00

README.md

Better complement docs (#16946 )

2024-02-20 17:14:50 +00:00

README.md

Unified Complement image for Synapse

This is an image for testing Synapse with the Complement integration test suite. It contains some insecure defaults that are only suitable for testing purposes, so please don't use this image for a production server.

This multi-purpose image is built on top of Dockerfile-workers in the parent directory and can be switched using environment variables between the following configurations:

Monolithic Synapse with SQLite (default, or SYNAPSE_COMPLEMENT_DATABASE=sqlite)
Monolithic Synapse with Postgres (SYNAPSE_COMPLEMENT_DATABASE=postgres)
Workerised Synapse with Postgres (SYNAPSE_COMPLEMENT_DATABASE=postgres and SYNAPSE_COMPLEMENT_USE_WORKERS=true)

The image is self-contained; it contains an integrated Postgres, Redis and Nginx.

How to get Complement to pass the environment variables through

To pass these environment variables, use Complement's COMPLEMENT_SHARE_ENV_PREFIX variable to configure an environment prefix to pass through, then prefix the above options with that prefix.

Example:

COMPLEMENT_SHARE_ENV_PREFIX=PASS_ PASS_SYNAPSE_COMPLEMENT_DATABASE=postgres

Consult scripts-dev/complement.sh in the repository root for a real example.

How to modify homeserver.yaml for Complement tests

It's common for MSCs to be gated behind a feature flag like this:

experimental_features:
  faster_joins: true

To modify this for the Complement image, modify ./conf/workers-shared-extra.yaml.j2. Despite the name, this will affect non-worker mode as well. Remember to rebuild the image (so don't use -e if using complement.sh).