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Handle /backfill returning no events (#10133)

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Fixes #10123
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Erik Johnston 2021-06-08 10:37:01 +01:00 committed by GitHub
parent 0acb5010ec
commit a0101fc021
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2 changed files with 26 additions and 13 deletions
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1
changelog.d/10133.bugfix Normal file
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@ -0,0 +1 @@
Fix bug when using workers where pagination requests failed if a remote server returned zero events from `/backfill`. Introduced in 1.35.0.

38
synapse/handlers/federation.py
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@ -22,6 +22,7 @@ from collections.abc import Container
from http import HTTPStatus from http import HTTPStatus
from typing import ( from typing import (
TYPE_CHECKING, TYPE_CHECKING,
Collection,
Dict, Dict,
Iterable, Iterable,
List, List,
@ -1364,11 +1365,12 @@ class FederationHandler(BaseHandler):
event_infos.append(_NewEventInfo(event, None, auth)) event_infos.append(_NewEventInfo(event, None, auth))
await self._auth_and_persist_events( if event_infos:
destination, await self._auth_and_persist_events(
room_id, destination,
event_infos, room_id,
) event_infos,
)
def _sanity_check_event(self, ev: EventBase) -> None: def _sanity_check_event(self, ev: EventBase) -> None:
""" """
@ -2077,7 +2079,7 @@ class FederationHandler(BaseHandler):
self, self,
origin: str, origin: str,
room_id: str, room_id: str,
event_infos: Iterable[_NewEventInfo], event_infos: Collection[_NewEventInfo],
backfilled: bool = False, backfilled: bool = False,
) -> None: ) -> None:
"""Creates the appropriate contexts and persists events. The events """Creates the appropriate contexts and persists events. The events
@ -2088,6 +2090,9 @@ class FederationHandler(BaseHandler):
Notifies about the events where appropriate. Notifies about the events where appropriate.
""" """
if not event_infos:
return
async def prep(ev_info: _NewEventInfo): async def prep(ev_info: _NewEventInfo):
event = ev_info.event event = ev_info.event
with nested_logging_context(suffix=event.event_id): with nested_logging_context(suffix=event.event_id):
@ -2216,13 +2221,14 @@ class FederationHandler(BaseHandler):
raise raise
events_to_context[e.event_id].rejected = RejectedReason.AUTH_ERROR events_to_context[e.event_id].rejected = RejectedReason.AUTH_ERROR
await self.persist_events_and_notify( if auth_events or state:
room_id, await self.persist_events_and_notify(
[ room_id,
(e, events_to_context[e.event_id]) [
for e in itertools.chain(auth_events, state) (e, events_to_context[e.event_id])
], for e in itertools.chain(auth_events, state)
) ],
)
new_event_context = await self.state_handler.compute_event_context( new_event_context = await self.state_handler.compute_event_context(
event, old_state=state event, old_state=state
@ -3061,7 +3067,13 @@ class FederationHandler(BaseHandler):
the same room. the same room.
backfilled: Whether these events are a result of backfilled: Whether these events are a result of
backfilling or not backfilling or not
Returns:
The stream ID after which all events have been persisted.
""" """
if not event_and_contexts:
return self.store.get_current_events_token()
instance = self.config.worker.events_shard_config.get_instance(room_id) instance = self.config.worker.events_shard_config.get_instance(room_id)
if instance != self._instance_name: if instance != self._instance_name:
# Limit the number of events sent over replication. We choose 200 # Limit the number of events sent over replication. We choose 200