Fetch events in a separate transaction.

This has a couple of benefits:

- It reduces the time of transactions, allowing other database requests
  to run.
- Fetching events is given a dedicated database thread, and so can't
  starve other database requests.
This commit is contained in:
Erik Johnston 2016-02-02 15:58:14 +00:00
parent 04ad93e6fd
commit 477b1ed6cf

View file

@ -220,27 +220,29 @@ class StreamStore(SQLBaseStore):
rows = self.cursor_to_dict(txn)
ret = self._get_events_txn(
txn,
[r["event_id"] for r in rows],
get_prev_content=True
)
return rows
self._set_before_and_after(ret, rows, topo_order=False)
rows = yield self.runInteraction("get_room_events_stream_for_room", f)
ret.reverse()
ret = yield self._get_events(
[r["event_id"] for r in rows],
get_prev_content=True
)
if rows:
key = "s%d" % min(r["stream_ordering"] for r in rows)
else:
# Assume we didn't get anything because there was nothing to
# get.
key = from_key
self._set_before_and_after(ret, rows, topo_order=False)
return ret, key
res = yield self.runInteraction("get_room_events_stream_for_room", f)
defer.returnValue(res)
ret.reverse()
if rows:
key = "s%d" % min(r["stream_ordering"] for r in rows)
else:
# Assume we didn't get anything because there was nothing to
# get.
key = from_key
defer.returnValue((ret, key))
@defer.inlineCallbacks
def get_room_changes_for_user(self, user_id, from_key, to_key):
if from_key is not None:
from_id = RoomStreamToken.parse_stream_token(from_key).stream
@ -249,14 +251,14 @@ class StreamStore(SQLBaseStore):
to_id = RoomStreamToken.parse_stream_token(to_key).stream
if from_key == to_key:
return defer.succeed([])
defer.returnValue([])
if from_id:
has_changed = self._membership_stream_cache.has_entity_changed(
user_id, int(from_id)
)
if not has_changed:
return defer.succeed([])
defer.returnValue([])
def f(txn):
if from_id is not None:
@ -281,17 +283,18 @@ class StreamStore(SQLBaseStore):
txn.execute(sql, (user_id, to_id,))
rows = self.cursor_to_dict(txn)
ret = self._get_events_txn(
txn,
[r["event_id"] for r in rows],
get_prev_content=True
)
return rows
self._set_before_and_after(ret, rows, topo_order=False)
rows = yield self.runInteraction("get_room_changes_for_user", f)
return ret
ret = yield self._get_events(
[r["event_id"] for r in rows],
get_prev_content=True
)
return self.runInteraction("get_room_changes_for_user", f)
self._set_before_and_after(ret, rows, topo_order=False)
defer.returnValue(ret)
def get_room_events_stream(
self,