mirror of
https://github.com/matrix-org/dendrite
synced 2024-11-16 14:50:52 +01:00
33 lines
2 KiB
Markdown
33 lines
2 KiB
Markdown
---
|
|
nav_exclude: true
|
|
---
|
|
|
|
## Peeking
|
|
|
|
Local peeking is implemented as per [MSC2753](https://github.com/matrix-org/matrix-doc/pull/2753).
|
|
|
|
Implementationwise, this means:
|
|
|
|
* Users call `/peek` and `/unpeek` on the clientapi from a given device.
|
|
* The clientapi delegates these via HTTP to the roomserver, which coordinates peeking in general for a given room
|
|
* The roomserver writes an NewPeek event into the kafka log headed to the syncserver
|
|
* The syncserver tracks the existence of the local peek in the syncapi_peeks table in its DB, and then starts waking up the peeking devices for the room in question, putting it in the `peek` section of the /sync response.
|
|
|
|
Peeking over federation is implemented as per [MSC2444](https://github.com/matrix-org/matrix-doc/pull/2444).
|
|
|
|
For requests to peek our rooms ("inbound peeks"):
|
|
|
|
* Remote servers call `/peek` on federationapi
|
|
* The federationapi queries the federationsender to check if this is renewing an inbound peek or not.
|
|
* If not, it hits the PerformInboundPeek on the roomserver to ask it for the current state of the room.
|
|
* The roomserver atomically (in theory) adds a NewInboundPeek to its kafka stream to tell the federationserver to start peeking.
|
|
* The federationsender receives the event, tracks the inbound peek in the federationsender_inbound_peeks table, and starts sending events to the peeking server.
|
|
* The federationsender evicts stale inbound peeks which haven't been renewed.
|
|
|
|
For peeking into other server's rooms ("outbound peeks"):
|
|
|
|
* The `roomserver` will kick the `federationsender` much as it does for a federated `/join` in order to trigger a federated outbound `/peek`
|
|
* The `federationsender` tracks the existence of the outbound peek in in its federationsender_outbound_peeks table.
|
|
* The `federationsender` regularly renews the remote peek as long as there are still peeking devices syncing for it.
|
|
* TBD: how do we tell if there are no devices currently syncing for a given peeked room? The syncserver needs to tell the roomserver
|
|
somehow who then needs to warn the federationsender.
|