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State of the union update

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src/github.com/matrix-org/dendrite/syncapi/README.md
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# Sync API Server # Sync API Server
This server is responsible for servicing `/sync` requests. It gets its data from the room server output log. This server is responsible for servicing `/sync` requests. It gets its data from the room server output log. Currently, the sync server will:
- Return a valid `/sync` response for the user represented by the provided `access_token`.
- Return a "complete sync" if no `since` value is provided, and return a valid `next_batch` token. This contains all rooms the user has been invited to or has joined. For joined rooms, this includes the complete current room state and the most recent 20 (hard-coded) events in the timeline.
- For "incremental syncs" (a `since` value is provided), as you get invited to, join, or leave rooms they will be reflected correctly in the `/sync` response.
- For very large state deltas, the `state` section of a room is correctly populated with the state of the room at the *start* of the timeline.
- When you join a room, the `/sync` which transitions your client to be "joined" will include the complete current room state as per the specification.
- Only wake up user streams it needs to wake up.
- Honours the `timeout` query parameter value.
## Internals ## Internals
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This version of the sync server uses very simple indexing to calculate room state at various points. This version of the sync server uses very simple indexing to calculate room state at various points.
This is inefficient when a very old `since` value is provided, or the `full_state` is requested, as the state delta becomes This is inefficient when a very old `since` value is provided, or the `full_state` is requested, as the state delta becomes
very large. This is mitigated slightly with indexes, but better data structures could be used in the future. very large. This is mitigated slightly with indexes, but better data structures could be used in the future.
## Known Issues
- `m.room.history_visibility` is not honoured: it is always treated as "shared".
- All ephemeral events are not implemented (presence, typing, receipts).
- Account data (both user and room) is not implemented.
- `to_device` messages are not implemented.
- Back-pagination via `prev_batch` is not implemented.
- The `limited` flag can lie.
- Filters are not honoured or implemented. The `limit` for each room is hard-coded to 20.
- The `full_state` query parameter is not implemented.
- The `set_presence` query parameter is not implemented.
- "Ignored" users are not ignored.
- Redacted events are still sent to clients.
- Invites over federation (if it existed) won't work as they aren't "real" events and so won't be in the right tables.
- `invite_state` is not implemented (for similar reasons to the above point).
- The current implementation scales badly when a very old `since` token is provided.