doesn't yet compile or work.
needs to actually add the peeking block into the sync response.
checking in now before it gets any bigger, and to gather any initial feedback on the vague shape of it.
* Enforce history visibility etc for /rooms/{roomID}/state
* Deduplicate OnIncomingStateRequest and OnIncomingStateTypeRequest
* Revert "Deduplicate OnIncomingStateRequest and OnIncomingStateTypeRequest"
This reverts commit 335035d66e.
* Initial work on roomserver NID caches
* Give caches to roomserver storage
* Populate caches
* Fix bugs
* Fix WASM build
* Don't hit cache twice in RoomNIDExcludingStubs
* Store reverse room ID-room NID mapping, consult caches when assigning NIDs
* Offset updates take place using TransactionWriter
* Refactor TransactionWriter in current state server
* Refactor TransactionWriter in federation sender
* Refactor TransactionWriter in key server
* Refactor TransactionWriter in media API
* Refactor TransactionWriter in server key API
* Refactor TransactionWriter in sync API
* Refactor TransactionWriter in user API
* Fix deadlocking Sync API tests
* Un-deadlock device database
* Fix appservice API
* Rename TransactionWriters to Writers
* Move writers up a layer in sync API
* Document sqlutil.Writer interface
* Add note to Writer documentation
* Add FederationClient interface to federationsender
- Use a shim struct in HTTP mode to keep the same API as `FederationClient`.
- Use `federationsender` instead of `FederationClient` in `keyserver`.
* Pointers not values
* Review comments
* Fix unit tests
* Rejig backoff
* Unbreak test
* Remove debug logs
* Review comments and linting
* Per-room input mutex
* GetMembership should use transaction when assigning state key NID
* Actually use writer transactions rather than ignoring them
* Limit per-room mutexes to Postgres
* Flip the check in InputRoomEvents
* Client API: mutex on (user_id, room_id)
* Client API: mutex on (user_id, room_id)
Changed variable name used for the mutexes map
Changed the place where the mutex is locked
Changed unlock to a defered call instead of manually calling it
* Updated TransactionWriters, moved locks in roomserver, various other tweaks
* Fix redaction deadlocks
* Fix lint issue
* Rename SQLiteTransactionWriter to ExclusiveTransactionWriter
* Fix us not sending transactions through in latest events updater
