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Add notes on what message sending will look like in dendrite (#45)
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Mark Haines
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README.md
103
README.md
@ -62,38 +62,119 @@ so that the readers can avoid querying the room server unnecessarily.
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[This architecture can be extended to cover most of the APIs.](WIRING.md)
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## How things are supposed to work.
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### Local client sends an event in an existing room.
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0) The client sends a PUT `/_matrix/client/r0/rooms/{roomId}/send` request
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and an HTTP loadbalancer routes the request to a ClientAPI.
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1) The ClientAPI:
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* Authenticates the local user using the `access_token` sent in the HTTP
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request.
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* Checks if it has already processed or is processing a request with the
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same `txnID`.
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* Calculates which state events are needed to auth the request.
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* Queries the necessary state events and the latest events in the room
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from the RoomServer.
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* Confirms that the room exists and checks whether the event is allowed by
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the auth checks.
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* Builds and signs the events.
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* Writes the event to a "InputRoomEvent" kafka topic.
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* Send a `200 OK` response to the client.
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2) The RoomServer reads the event from "InputRoomEvent" kafka topic:
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* Checks if it has already has a copy of the event.
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* Checks if the event is allowed by the auth checks using the auth events
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at the event.
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* Calculates the room state at the event.
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* Works out what the latest events in the room after processing this event
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are.
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* Calculate how the changes in the latest events affect the current state
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of the room.
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* TODO: Workout what events determine the visibility of this event to other
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users
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* Writes the event along with the changes in current state to an
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"OutputRoomEvent" kafka topic. It writes all the events for a room to
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the same kafka partition.
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3a) The ClientSync reads the event from the "OutputRoomEvent" kafka topic:
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* Updates its copy of the current state for the room.
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* Works out which users need to be notified about the event.
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* Wakes up any pending `/_matrix/client/r0/sync` requests for those users.
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* Adds the event to the recent timeline events for the room.
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3b) The FederationSender reads the event from the "OutputRoomEvent" kafka topic:
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* Updates its copy of the current state for the room.
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* Works out which remote servers need to be notified about the event.
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* Sends a `/_matrix/federation/v1/send` request to those servers.
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* Or if there is a request in progress then add the event to a queue to be
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sent when the previous request finishes.
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### Remote server sends an event in an existing room.
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0) The remote server sends a `PUT /_matrix/federation/v1/send` request and an
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HTTP loadbalancer routes the request to a FederationReceiver.
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1) The FederationReceiver:
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* Authenticates the remote server using the "X-Matrix" authorisation header.
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* Checks if it has already processed or is processing a request with the
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same `txnID`.
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* Checks the signatures for the events.
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Fetches the ed2519 keys for the event senders if necessary.
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* Queries the RoomServer for a copy of the state of the room at each event.
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* If the RoomServer doesn't know the state of the room at an event then
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query the state of the room at the event from the remote server using
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`GET /_matrix/federation/v1/state_ids` falling back to
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`GET /_matrix/federation/v1/state` if necessary.
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* Once the state at each event is known check whether the events are
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allowed by the auth checks against the state at each event.
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* For each event that is allowed write the event to the "InputRoomEvent"
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kafka topic.
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* Send a 200 OK response to the remote server listing which events were
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successfully processed and which events failed
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2) The RoomServer processes the event the same as it would a local event.
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3a) The ClientSync processes the event the same as it would a local event.
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# TODO
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- [ ] gomatrixlib
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- [x] Canonical JSON.
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- [x] Signed JSON.
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- [ ] Event hashing.
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- [ ] Event signing.
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- [x] Event hashing.
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- [x] Event signing.
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- [x] Federation server discovery.
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- [x] Federation key lookup.
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- [ ] Federation request signing.
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- [x] Event authentication.
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- [ ] Event visibility.
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- [ ] State resolution.
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- [x] State resolution.
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- [ ] Third party invites authentication.
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- [ ] Room Server
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- [ ] Inputing new events from logs.
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- [ ] Inputing backfilled events from logs.
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- [ ] Outputing events and current state to logs.
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- [x] Inputting new events from logs.
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- [ ] Inputting back-filled events from logs.
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- [x] Outputting events and current state to logs.
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- [ ] Querying state at an event.
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- [ ] Querying current forward extremities and state.
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- [x] Querying current forward extremities and state.
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- [ ] Querying message history.
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- [ ] Exporting/importing messages from other servers.
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- [ ] Other Room Server stuff.
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- [ ] Client Room Send
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- [ ] Handling /client/r0/room/... HTTP PUTs
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- [x] Handling /client/r0/room/... HTTP PUTs
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- [ ] Talk to remote servers for joins to remote servers.
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- [ ] Outputting new events to logs.
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- [x] Outputting new events to logs.
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- [ ] Updating the last active time in presence.
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- [ ] Other Client Room Send stuff.
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- [ ] Client Sync
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- [ ] Inputing new room events and state from the logs.
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- [ ] Inputting new room events and state from the logs.
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- [ ] Handling /client/r0/sync HTTP GETs
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- [ ] Outputing whether the client is syncing to the logs.
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- [ ] Outputting whether the client is syncing to the logs.
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- [ ] Other Client Sync Stuff.
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- [ ] Other Components.
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@ -20,7 +20,7 @@ Diagram:
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+----------| W | +----------| S | +--------| R |
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| +---+ | Receipts +---+ | Client +---+
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| Federation |>=========================================>| Server |>=====================>| Sync |
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| Send | | | | |
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| Receiver | | | | |
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| | +---+ | | | |
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| | +--------| W | | | | |
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| | | Client +---+ | | | |
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@ -49,8 +49,8 @@ Diagram:
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| | +---+ | | +---+ | |
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| | +--------| W | | | +----------| S | | |
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| | | Client +---+ | | | Presence +---+ | |
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| | | Room |>=====>| |>=====>| Server |>=====================>| |
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| | | Send | +--------+ | | | |
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| | | API |>=====>| |>=====>| Server |>=====================>| |
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| | | /send | +--------+ | | | |
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| | | | | | | |
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| | | |>======================>| |<=====================<| |
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| | +----------+ | | | |
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@ -101,7 +101,7 @@ choke-point to implement ratelimiting and backoff correctly.
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* Writes typing updates to logs.
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* Writes other updates to logs.
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## Client Room Send
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## Client API /send
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* Handles puts to `/client/v1/rooms/` that create room events.
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* Queries information needed to process events from the Room Server.
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