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Don't add rejected events if we've seen them befrore. Add some comments to explain what the code is doing mechanically

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This commit is contained in:
Mark Haines 2016-07-26 10:49:52 +01:00
parent 1b3c3e6d68
commit efeb6176c1
1 changed files with 48 additions and 5 deletions
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53
synapse/storage/events.py
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@ -397,6 +397,12 @@ class EventsStore(SQLBaseStore):
@log_function
def _persist_events_txn(self, txn, events_and_contexts, backfilled):
"""Insert some number of room events into the necessary database tables.
Rejected events are only inserted into the events table, the events_json table,
and the rejections table. Things reading from those table will need to check
whether the event was rejected.
"""
depth_updates = {}
for event, context in events_and_contexts:
# Remove the any existing cache entries for the event_ids
@ -427,15 +433,21 @@ class EventsStore(SQLBaseStore):
for event_id, outlier in txn.fetchall()
}
# Remove the events that we've seen before.
event_map = {}
to_remove = set()
for event, context in events_and_contexts:
if context.rejected:
# If the event is rejected then we don't care if the event
# was an outlier or not.
if event.event_id in have_persisted:
# If we have already seen the event then ignore it.
to_remove.add(event)
continue
# Handle the case of the list including the same event multiple
# times. The tricky thing here is when they differ by whether
# they are an outlier.
if context.rejected:
continue
if event.event_id in event_map:
other = event_map[event.event_id]
@ -457,6 +469,12 @@ class EventsStore(SQLBaseStore):
outlier_persisted = have_persisted[event.event_id]
if not event.internal_metadata.is_outlier() and outlier_persisted:
# We received a copy of an event that we had already stored as
# an outlier in the database. We now have some state at that
# so we need to update the state_groups table with that state.
# insert into the state_group, state_groups_state and
# event_to_state_groups tables.
self._store_mult_state_groups_txn(txn, ((event, context),))
metadata_json = encode_json(
@ -472,6 +490,8 @@ class EventsStore(SQLBaseStore):
(metadata_json, event.event_id,)
)
# Add an entry to the ex_outlier_stream table to replicate the
# change in outlier status to our workers.
stream_order = event.internal_metadata.stream_ordering
state_group_id = context.state_group or context.new_state_group_id
self._simple_insert_txn(
@ -493,6 +513,8 @@ class EventsStore(SQLBaseStore):
(False, event.event_id,)
)
# Update the event_backward_extremities table now that this
# event isn't an outlier any more.
self._update_extremeties(txn, [event])
events_and_contexts = [
@ -557,24 +579,30 @@ class EventsStore(SQLBaseStore):
],
)
# Remove the rejected events from the list now that we've added them
# to the events table and the events_json table.
to_remove = set()
for event, context in events_and_contexts:
if context.rejected:
# Insert the event_id into the rejections table
self._store_rejections_txn(
txn, event.event_id, context.rejected
)
to_remove.add(event.event_id)
to_remove.add(event)
events_and_contexts = [
ec for ec in events_and_contexts if ec[0].event_id not in to_remove
ec for ec in events_and_contexts if ec[0] not in to_remove
]
if not events_and_contexts:
# Make sure we don't pass an empty list to functions that expect to
# be storing at least one element.
return
# From this point onwards the events are only ones that weren't rejected.
for event, context in events_and_contexts:
# Insert all the push actions into the event_push_actions table.
if context.push_actions:
self._set_push_actions_for_event_and_users_txn(
txn, event, context.push_actions
@ -595,12 +623,18 @@ class EventsStore(SQLBaseStore):
)
if event.type == EventTypes.Redaction and event.redacts is not None:
# Remove the entries in the event_push_actions table for the
# redacted event.
self._remove_push_actions_for_event_id_txn(
txn, event.room_id, event.redacts
)
# Insert into the state_groups, state_groups_state, and
# event_to_state_groups tables.
self._store_mult_state_groups_txn(txn, events_and_contexts)
# Update the event_forward_extremities, event_backward_extremities and
# event_edges tables.
self._handle_mult_prev_events(
txn,
events=[event for event, _ in events_and_contexts],
@ -608,18 +642,25 @@ class EventsStore(SQLBaseStore):
for event, _ in events_and_contexts:
if event.type == EventTypes.Name:
# Insert into the room_names and event_search tables.
self._store_room_name_txn(txn, event)
elif event.type == EventTypes.Topic:
# Insert into the topics table and event_search table.
self._store_room_topic_txn(txn, event)
elif event.type == EventTypes.Message:
# Insert into the event_search table.
self._store_room_message_txn(txn, event)
elif event.type == EventTypes.Redaction:
# Insert into the redactions table.
self._store_redaction(txn, event)
elif event.type == EventTypes.RoomHistoryVisibility:
# Insert into the event_search table.
self._store_history_visibility_txn(txn, event)
elif event.type == EventTypes.GuestAccess:
# Insert into the event_search table.
self._store_guest_access_txn(txn, event)
# Insert into the room_memberships table.
self._store_room_members_txn(
txn,
[
@ -630,6 +671,7 @@ class EventsStore(SQLBaseStore):
backfilled=backfilled,
)
# Insert event_reference_hashes table.
self._store_event_reference_hashes_txn(
txn, [event for event, _ in events_and_contexts]
)
@ -674,6 +716,7 @@ class EventsStore(SQLBaseStore):
],
)
# Prefil the event cache
self._add_to_cache(txn, events_and_contexts)
if backfilled: