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Merge pull request #3199 from matrix-org/erikj/pagination_sync

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Refactor sync APIs to reuse pagination API
This commit is contained in:
Erik Johnston 2018-05-09 16:16:56 +01:00 committed by GitHub
commit bfe1f73855
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2 changed files with 54 additions and 45 deletions
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24
synapse/handlers/sync.py
View File

@ -354,12 +354,24 @@ class SyncHandler(object):
since_key = since_token.room_key
while limited and len(recents) < timeline_limit and max_repeat:
events, end_key = yield self.store.get_room_events_stream_for_room(
room_id,
limit=load_limit + 1,
from_key=since_key,
to_key=end_key,
)
# If we have a since_key then we are trying to get any events
# that have happened since `since_key` up to `end_key`, so we
# can just use `get_room_events_stream_for_room`.
# Otherwise, we want to return the last N events in the room
# in toplogical ordering.
if since_key:
events, end_key = yield self.store.get_room_events_stream_for_room(
room_id,
limit=load_limit + 1,
from_key=since_key,
to_key=end_key,
)
else:
events, end_key = yield self.store.get_recent_events_for_room(
room_id,
limit=load_limit + 1,
end_token=end_key,
)
loaded_recents = sync_config.filter_collection.filter_room_timeline(
events
)

75
synapse/storage/stream.py
View File

@ -233,52 +233,49 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
@defer.inlineCallbacks
def get_room_events_stream_for_room(self, room_id, from_key, to_key, limit=0,
order='DESC'):
# Note: If from_key is None then we return in topological order. This
# is because in that case we're using this as a "get the last few messages
# in a room" function, rather than "get new messages since last sync"
if from_key is not None:
from_id = RoomStreamToken.parse_stream_token(from_key).stream
else:
from_id = None
to_id = RoomStreamToken.parse_stream_token(to_key).stream
"""Get new room events in stream ordering since `from_key`.
Args:
room_id (str)
from_key (str): Token from which no events are returned before
to_key (str): Token from which no events are returned after. (This
is typically the current stream token)
limit (int): Maximum number of events to return
order (str): Either "DESC" or "ASC". Determines which events are
returned when the result is limited. If "DESC" then the most
recent `limit` events are returned, otherwise returns the
oldest `limit` events.
Returns:
Deferred[tuple[list[FrozenEvent], str]]: Returns the list of
events (in ascending order) and the token from the start of
the chunk of events returned.
"""
if from_key == to_key:
defer.returnValue(([], from_key))
if from_id:
has_changed = yield self._events_stream_cache.has_entity_changed(
room_id, from_id
)
from_id = RoomStreamToken.parse_stream_token(from_key).stream
to_id = RoomStreamToken.parse_stream_token(to_key).stream
if not has_changed:
defer.returnValue(([], from_key))
has_changed = yield self._events_stream_cache.has_entity_changed(
room_id, from_id
)
if not has_changed:
defer.returnValue(([], from_key))
def f(txn):
if from_id is not None:
sql = (
"SELECT event_id, stream_ordering FROM events WHERE"
" room_id = ?"
" AND not outlier"
" AND stream_ordering > ? AND stream_ordering <= ?"
" ORDER BY stream_ordering %s LIMIT ?"
) % (order,)
txn.execute(sql, (room_id, from_id, to_id, limit))
rows = [_EventDictReturn(row[0], None, row[1]) for row in txn]
else:
sql = (
"SELECT event_id, topological_ordering, stream_ordering"
" FROM events"
" WHERE"
" room_id = ?"
" AND not outlier"
" AND stream_ordering <= ?"
" ORDER BY topological_ordering %s, stream_ordering %s LIMIT ?"
) % (order, order,)
txn.execute(sql, (room_id, to_id, limit))
rows = [_EventDictReturn(row[0], row[1], row[2]) for row in txn]
sql = (
"SELECT event_id, stream_ordering FROM events WHERE"
" room_id = ?"
" AND not outlier"
" AND stream_ordering > ? AND stream_ordering <= ?"
" ORDER BY stream_ordering %s LIMIT ?"
) % (order,)
txn.execute(sql, (room_id, from_id, to_id, limit))
rows = [_EventDictReturn(row[0], None, row[1]) for row in txn]
return rows
rows = yield self.runInteraction("get_room_events_stream_for_room", f)
@ -393,7 +390,7 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
if limit == 0:
defer.returnValue(([], end_token))
end_token = RoomStreamToken.parse_stream_token(end_token)
end_token = RoomStreamToken.parse(end_token)
rows, token = yield self.runInteraction(
"get_recent_event_ids_for_room", self._paginate_room_events_txn,