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Refactor get_events_from_store_or_dest to return a dict (#6501)
There was a bunch of unnecessary conversion back and forth between dict and list going on here. We can simplify a bunch of the code.
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changelog.d/6501.misc
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changelog.d/6501.misc
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Refactor get_events_from_store_or_dest to return a dict.
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@ -18,8 +18,6 @@ import copy
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import itertools
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import logging
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from six.moves import range
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from prometheus_client import Counter
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from twisted.internet import defer
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@ -41,7 +39,7 @@ from synapse.events import builder, room_version_to_event_format
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from synapse.federation.federation_base import FederationBase, event_from_pdu_json
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from synapse.logging.context import make_deferred_yieldable, run_in_background
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from synapse.logging.utils import log_function
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from synapse.util import unwrapFirstError
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from synapse.util import batch_iter, unwrapFirstError
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from synapse.util.caches.expiringcache import ExpiringCache
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from synapse.util.retryutils import NotRetryingDestination
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@ -331,10 +329,12 @@ class FederationClient(FederationBase):
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state_event_ids = result["pdu_ids"]
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auth_event_ids = result.get("auth_chain_ids", [])
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fetched_events, failed_to_fetch = yield self.get_events_from_store_or_dest(
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destination, room_id, set(state_event_ids + auth_event_ids)
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desired_events = set(state_event_ids + auth_event_ids)
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event_map = yield self.get_events_from_store_or_dest(
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destination, room_id, desired_events
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)
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failed_to_fetch = desired_events - event_map.keys()
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if failed_to_fetch:
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logger.warning(
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"Failed to fetch missing state/auth events for %s: %s",
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@ -342,8 +342,6 @@ class FederationClient(FederationBase):
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failed_to_fetch,
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)
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event_map = {ev.event_id: ev for ev in fetched_events}
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pdus = [event_map[e_id] for e_id in state_event_ids if e_id in event_map]
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auth_chain = [event_map[e_id] for e_id in auth_event_ids if e_id in event_map]
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@ -358,23 +356,18 @@ class FederationClient(FederationBase):
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Args:
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destination (str)
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room_id (str)
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event_ids (list)
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event_ids (Iterable[str])
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Returns:
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Deferred: A deferred resolving to a 2-tuple where the first is a list of
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events and the second is a list of event ids that we failed to fetch.
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Deferred[dict[str, EventBase]]: A deferred resolving to a map
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from event_id to event
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"""
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seen_events = yield self.store.get_events(event_ids, allow_rejected=True)
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signed_events = list(seen_events.values())
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fetched_events = yield self.store.get_events(event_ids, allow_rejected=True)
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failed_to_fetch = set()
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missing_events = set(event_ids)
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for k in seen_events:
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missing_events.discard(k)
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missing_events = set(event_ids) - fetched_events.keys()
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if not missing_events:
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return signed_events, failed_to_fetch
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return fetched_events
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logger.debug(
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"Fetching unknown state/auth events %s for room %s",
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@ -384,11 +377,8 @@ class FederationClient(FederationBase):
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room_version = yield self.store.get_room_version(room_id)
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batch_size = 20
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missing_events = list(missing_events)
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for i in range(0, len(missing_events), batch_size):
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batch = set(missing_events[i : i + batch_size])
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# XXX 20 requests at once? really?
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for batch in batch_iter(missing_events, 20):
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deferreds = [
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run_in_background(
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self.get_pdu,
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@ -404,13 +394,9 @@ class FederationClient(FederationBase):
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)
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for success, result in res:
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if success and result:
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signed_events.append(result)
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batch.discard(result.event_id)
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fetched_events[result.event_id] = result
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# We removed all events we successfully fetched from `batch`
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failed_to_fetch.update(batch)
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return signed_events, failed_to_fetch
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return fetched_events
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@defer.inlineCallbacks
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@log_function
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