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Refactor EventContext (#12689)

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Refactor how the `EventContext` class works, with the intention of reducing the amount of state we fetch from the DB during event processing.

The idea here is to get rid of the cached `current_state_ids` and `prev_state_ids` that live in the `EventContext`, and instead defer straight to the database (and its caching). 

One change that may have a noticeable effect is that we now no longer prefill the `get_current_state_ids` cache on a state change. However, that query is relatively light, since its just a case of reading a table from the DB (unlike fetching state at an event which is more heavyweight). For deployments with workers this cache isn't even used.


Part of #12684
This commit is contained in:
Erik Johnston 2022-05-10 20:43:13 +01:00 • committed by GitHub
parent c997bfb926
commit c72d26c1e1
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13 changed files with 70 additions and 200 deletions
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6
synapse/handlers/federation.py
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@ -659,7 +659,7 @@ class FederationHandler:
# in the invitee's sync stream. It is stripped out for all other local users.
event.unsigned["knock_room_state"] = stripped_room_state["knock_state_events"]
context = EventContext.for_outlier()
context = EventContext.for_outlier(self.storage)
stream_id = await self._federation_event_handler.persist_events_and_notify(
event.room_id, [(event, context)]
)
@ -848,7 +848,7 @@ class FederationHandler:
)
)
context = EventContext.for_outlier()
context = EventContext.for_outlier(self.storage)
await self._federation_event_handler.persist_events_and_notify(
event.room_id, [(event, context)]
)
@ -877,7 +877,7 @@ class FederationHandler:
await self.federation_client.send_leave(host_list, event)
context = EventContext.for_outlier()
context = EventContext.for_outlier(self.storage)
stream_id = await self._federation_event_handler.persist_events_and_notify(
event.room_id, [(event, context)]
)