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Skip attempt to get state at backwards-extremities (#12173)

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We don't *have* the state at a backwards-extremity, so this is never going to
do anything useful.
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Richard van der Hoff 2022-03-09 11:00:48 +00:00 committed by GitHub
parent 9a0172d49f
commit dc8d825ef2
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2 changed files with 4 additions and 57 deletions
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1
changelog.d/12173.misc Normal file
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@ -0,0 +1 @@
Avoid trying to calculate the state at outlier events.

60
synapse/handlers/federation.py
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@ -23,8 +23,6 @@ from signedjson.key import decode_verify_key_bytes
from signedjson.sign import verify_signed_json
from unpaddedbase64 import decode_base64
from twisted.internet import defer
from synapse import event_auth
from synapse.api.constants import EventContentFields, EventTypes, Membership
from synapse.api.errors import (
@ -45,11 +43,7 @@ from synapse.events.snapshot import EventContext
from synapse.events.validator import EventValidator
from synapse.federation.federation_client import InvalidResponseError
from synapse.http.servlet import assert_params_in_dict
from synapse.logging.context import (
make_deferred_yieldable,
nested_logging_context,
preserve_fn,
)
from synapse.logging.context import nested_logging_context
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.replication.http.federation import (
ReplicationCleanRoomRestServlet,
@ -355,56 +349,8 @@ class FederationHandler:
if success:
return True
# Huh, well *those* domains didn't work out. Lets try some domains
# from the time.
tried_domains = set(likely_domains)
tried_domains.add(self.server_name)
event_ids = list(extremities.keys())
logger.debug("calling resolve_state_groups in _maybe_backfill")
resolve = preserve_fn(self.state_handler.resolve_state_groups_for_events)
states_list = await make_deferred_yieldable(
defer.gatherResults(
[resolve(room_id, [e]) for e in event_ids], consumeErrors=True
)
)
# A map from event_id to state map of event_ids.
state_ids: Dict[str, StateMap[str]] = dict(
zip(event_ids, [s.state for s in states_list])
)
state_map = await self.store.get_events(
[e_id for ids in state_ids.values() for e_id in ids.values()],
get_prev_content=False,
)
# A map from event_id to state map of events.
state_events: Dict[str, StateMap[EventBase]] = {
key: {
k: state_map[e_id]
for k, e_id in state_dict.items()
if e_id in state_map
}
for key, state_dict in state_ids.items()
}
for e_id in event_ids:
likely_extremeties_domains = get_domains_from_state(state_events[e_id])
success = await try_backfill(
[
dom
for dom, _ in likely_extremeties_domains
if dom not in tried_domains
]
)
if success:
return True
tried_domains.update(dom for dom, _ in likely_extremeties_domains)
# TODO: we could also try servers which were previously in the room, but
# are no longer.
return False