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Factor out common code for persisting fetched auth events (#10896) * Factor more stuff out of `_get_events_and_persist` It turns out that the event-sorting algorithm in `_get_events_and_persist` is also useful in other circumstances. Here we move the current `_auth_and_persist_fetched_events` to `_auth_and_persist_fetched_events_inner`, and then factor the sorting part out to `_auth_and_persist_fetched_events`. * `_get_remote_auth_chain_for_event`: remove redundant `outlier` assignment `get_event_auth` returns events with the outlier flag already set, so this is redundant (though we need to update a test where `get_event_auth` is mocked). * `_get_remote_auth_chain_for_event`: move existing-event tests earlier Move a couple of tests outside the loop. This is a bit inefficient for now, but a future commit will make it better. It should be functionally identical. * `_get_remote_auth_chain_for_event`: use `_auth_and_persist_fetched_events` We can use the same codepath for persisting the events fetched as part of an auth chain as for those fetched individually by `_get_events_and_persist` for building the state at a backwards extremity. * `_get_remote_auth_chain_for_event`: use a dict for efficiency `_auth_and_persist_fetched_events` sorts the events itself, so we no longer need to care about maintaining the ordering from `get_event_auth` (and no longer need to sort by depth in `get_event_auth`). That means that we can use a map, making it easier to filter out events we already have, etc. * changelog * `_auth_and_persist_fetched_events`: improve docstring

2021-09-24 12:56:33 +02:00

Clean up some of the federation event authentication code for clarity.