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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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synapse/push/action_generator.py
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@ -40,5 +40,9 @@ class ActionGenerator:
async def handle_push_actions_for_event(
self, event: EventBase, context: EventContext
) -> None:
if event.internal_metadata.is_outlier():
# This can happen due to out of band memberships
return
with Measure(self.clock, "action_for_event_by_user"):
await self.bulk_evaluator.action_for_event_by_user(event, context)