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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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4
tests/test_visibility.py
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@ -234,7 +234,9 @@ class FilterEventsForServerTestCase(unittest.HomeserverTestCase):
event = self.get_success(builder.build(prev_event_ids=[], auth_event_ids=[]))
event.internal_metadata.outlier = True
self.get_success(
self.storage.persistence.persist_event(event, EventContext.for_outlier())
self.storage.persistence.persist_event(
event, EventContext.for_outlier(self.storage)
)
)
return event