diff --git a/synapse/federation/federation_server.py b/synapse/federation/federation_server.py
index e922b7ff4a..3ef700f7fc 100644
--- a/synapse/federation/federation_server.py
+++ b/synapse/federation/federation_server.py
@@ -574,68 +574,9 @@ class FederationServer(FederationBase):
pdu.room_id, len(prevs - seen),
)
- # We recalculate seen, since it may have changed.
- have_seen = yield self.store.have_events(prevs)
- seen = set(have_seen.keys())
-
- if prevs - seen:
- latest = yield self.store.get_latest_event_ids_in_room(
- pdu.room_id
- )
-
- # We add the prev events that we have seen to the latest
- # list to ensure the remote server doesn't give them to us
- latest = set(latest)
- latest |= seen
-
- logger.info(
- "Missing %d events for room %r: %r...",
- len(prevs - seen), pdu.room_id, list(prevs - seen)[:5]
- )
-
- # XXX: we set timeout to 10s to help workaround
- # https://github.com/matrix-org/synapse/issues/1733.
- # The reason is to avoid holding the linearizer lock
- # whilst processing inbound /send transactions, causing
- # FDs to stack up and block other inbound transactions
- # which empirically can currently take up to 30 minutes.
- #
- # N.B. this explicitly disables retry attempts.
- #
- # N.B. this also increases our chances of falling back to
- # fetching fresh state for the room if the missing event
- # can't be found, which slightly reduces our security.
- # it may also increase our DAG extremity count for the room,
- # causing additional state resolution? See #1760.
- # However, fetching state doesn't hold the linearizer lock
- # apparently.
- #
- # see https://github.com/matrix-org/synapse/pull/1744
-
- missing_events = yield self.get_missing_events(
- origin,
- pdu.room_id,
- earliest_events_ids=list(latest),
- latest_events=[pdu],
- limit=10,
- min_depth=min_depth,
- timeout=10000,
- )
-
- # We want to sort these by depth so we process them and
- # tell clients about them in order.
- missing_events.sort(key=lambda x: x.depth)
-
- for e in missing_events:
- yield self._handle_new_pdu(
- origin,
- e,
- get_missing=False
- )
-
- have_seen = yield self.store.have_events(
- [ev for ev, _ in pdu.prev_events]
- )
+ yield self._get_missing_events_for_pdu(
+ origin, pdu, prevs, min_depth
+ )
prevs = {e_id for e_id, _ in pdu.prev_events}
seen = set(have_seen.keys())
@@ -667,6 +608,85 @@ class FederationServer(FederationBase):
auth_chain=auth_chain,
)
+ @defer.inlineCallbacks
+ def _get_missing_events_for_pdu(self, origin, pdu, prevs, min_depth):
+ """
+ Args:
+ origin (str): Origin of the pdu. Will be called to get the missing events
+ pdu: received pdu
+ prevs (str[]): List of event ids which we are missing
+ min_depth (int): Minimum depth of events to return.
+
+ Returns:
+ Deferred<dict(str, str?)>: updated have_seen dictionary
+ """
+ # We recalculate seen, since it may have changed.
+ have_seen = yield self.store.have_events(prevs)
+ seen = set(have_seen.keys())
+
+ if not prevs - seen:
+ # nothing left to do
+ defer.returnValue(have_seen)
+
+ latest = yield self.store.get_latest_event_ids_in_room(
+ pdu.room_id
+ )
+
+ # We add the prev events that we have seen to the latest
+ # list to ensure the remote server doesn't give them to us
+ latest = set(latest)
+ latest |= seen
+
+ logger.info(
+ "Missing %d events for room %r: %r...",
+ len(prevs - seen), pdu.room_id, list(prevs - seen)[:5]
+ )
+
+ # XXX: we set timeout to 10s to help workaround
+ # https://github.com/matrix-org/synapse/issues/1733.
+ # The reason is to avoid holding the linearizer lock
+ # whilst processing inbound /send transactions, causing
+ # FDs to stack up and block other inbound transactions
+ # which empirically can currently take up to 30 minutes.
+ #
+ # N.B. this explicitly disables retry attempts.
+ #
+ # N.B. this also increases our chances of falling back to
+ # fetching fresh state for the room if the missing event
+ # can't be found, which slightly reduces our security.
+ # it may also increase our DAG extremity count for the room,
+ # causing additional state resolution? See #1760.
+ # However, fetching state doesn't hold the linearizer lock
+ # apparently.
+ #
+ # see https://github.com/matrix-org/synapse/pull/1744
+
+ missing_events = yield self.get_missing_events(
+ origin,
+ pdu.room_id,
+ earliest_events_ids=list(latest),
+ latest_events=[pdu],
+ limit=10,
+ min_depth=min_depth,
+ timeout=10000,
+ )
+
+ # We want to sort these by depth so we process them and
+ # tell clients about them in order.
+ missing_events.sort(key=lambda x: x.depth)
+
+ for e in missing_events:
+ yield self._handle_new_pdu(
+ origin,
+ e,
+ get_missing=False
+ )
+
+ have_seen = yield self.store.have_events(
+ [ev for ev, _ in pdu.prev_events]
+ )
+ defer.returnValue(have_seen)
+
def __str__(self):
return "<ReplicationLayer(%s)>" % self.server_name
|
