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Merge pull request #836 from matrix-org/erikj/change_event_cache

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Change the way we cache events
This commit is contained in:
Erik Johnston 2016-06-03 18:47:46 +01:00
commit 3210f4c385
1 changed files with 59 additions and 54 deletions
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107
synapse/storage/events.py
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@ -139,6 +139,9 @@ class _EventPeristenceQueue(object):
pass
_EventCacheEntry = namedtuple("_EventCacheEntry", ("event", "redacted_event"))
class EventsStore(SQLBaseStore):
EVENT_ORIGIN_SERVER_TS_NAME = "event_origin_server_ts"
@ -738,53 +741,65 @@ class EventsStore(SQLBaseStore):
event_id_list = event_ids
event_ids = set(event_ids)
event_map = self._get_events_from_cache(
event_entry_map = self._get_events_from_cache(
event_ids,
check_redacted=check_redacted,
get_prev_content=get_prev_content,
allow_rejected=allow_rejected,
)
missing_events_ids = [e for e in event_ids if e not in event_map]
missing_events_ids = [e for e in event_ids if e not in event_entry_map]
if missing_events_ids:
missing_events = yield self._enqueue_events(
missing_events_ids,
check_redacted=check_redacted,
get_prev_content=get_prev_content,
allow_rejected=allow_rejected,
)
event_map.update(missing_events)
event_entry_map.update(missing_events)
defer.returnValue([
event_map[e_id] for e_id in event_id_list
if e_id in event_map and event_map[e_id]
])
events = []
for event_id in event_id_list:
entry = event_entry_map.get(event_id, None)
if not entry:
continue
if allow_rejected or not entry.event.rejected_reason:
if check_redacted and entry.redacted_event:
event = entry.redacted_event
else:
event = entry.event
events.append(event)
if get_prev_content:
if "replaces_state" in event.unsigned:
prev = yield self.get_event(
event.unsigned["replaces_state"],
get_prev_content=False,
allow_none=True,
)
if prev:
event.unsigned = dict(event.unsigned)
event.unsigned["prev_content"] = prev.content
event.unsigned["prev_sender"] = prev.sender
defer.returnValue(events)
def _invalidate_get_event_cache(self, event_id):
for check_redacted in (False, True):
for get_prev_content in (False, True):
self._get_event_cache.invalidate(
(event_id, check_redacted, get_prev_content)
)
self._get_event_cache.invalidate((event_id,))
def _get_events_from_cache(self, events, check_redacted, get_prev_content,
allow_rejected):
def _get_events_from_cache(self, events, allow_rejected):
event_map = {}
for event_id in events:
try:
ret = self._get_event_cache.get(
(event_id, check_redacted, get_prev_content,)
)
ret = self._get_event_cache.get((event_id,), None)
if not ret:
continue
if allow_rejected or not ret.rejected_reason:
if allow_rejected or not ret.event.rejected_reason:
event_map[event_id] = ret
else:
event_map[event_id] = None
except KeyError:
pass
return event_map
@ -855,8 +870,7 @@ class EventsStore(SQLBaseStore):
reactor.callFromThread(fire, event_list)
@defer.inlineCallbacks
def _enqueue_events(self, events, check_redacted=True,
get_prev_content=False, allow_rejected=False):
def _enqueue_events(self, events, check_redacted=True, allow_rejected=False):
"""Fetches events from the database using the _event_fetch_list. This
allows batch and bulk fetching of events - it allows us to fetch events
without having to create a new transaction for each request for events.
@ -894,8 +908,6 @@ class EventsStore(SQLBaseStore):
[
preserve_fn(self._get_event_from_row)(
row["internal_metadata"], row["json"], row["redacts"],
check_redacted=check_redacted,
get_prev_content=get_prev_content,
rejected_reason=row["rejects"],
)
for row in rows
@ -904,7 +916,7 @@ class EventsStore(SQLBaseStore):
)
defer.returnValue({
e.event_id: e
e.event.event_id: e
for e in res if e
})
@ -936,7 +948,6 @@ class EventsStore(SQLBaseStore):
@defer.inlineCallbacks
def _get_event_from_row(self, internal_metadata, js, redacted,
check_redacted=True, get_prev_content=False,
rejected_reason=None):
d = json.loads(js)
internal_metadata = json.loads(internal_metadata)
@ -946,26 +957,27 @@ class EventsStore(SQLBaseStore):
table="rejections",
keyvalues={"event_id": rejected_reason},
retcol="reason",
desc="_get_event_from_row",
desc="_get_event_from_row_rejected_reason",
)
ev = FrozenEvent(
original_ev = FrozenEvent(
d,
internal_metadata_dict=internal_metadata,
rejected_reason=rejected_reason,
)
if check_redacted and redacted:
ev = prune_event(ev)
redacted_event = None
if redacted:
redacted_event = prune_event(original_ev)
redaction_id = yield self._simple_select_one_onecol(
table="redactions",
keyvalues={"redacts": ev.event_id},
keyvalues={"redacts": redacted_event.event_id},
retcol="event_id",
desc="_get_event_from_row",
desc="_get_event_from_row_redactions",
)
ev.unsigned["redacted_by"] = redaction_id
redacted_event.unsigned["redacted_by"] = redaction_id
# Get the redaction event.
because = yield self.get_event(
@ -977,23 +989,16 @@ class EventsStore(SQLBaseStore):
if because:
# It's fine to do add the event directly, since get_pdu_json
# will serialise this field correctly
ev.unsigned["redacted_because"] = because
redacted_event.unsigned["redacted_because"] = because
if get_prev_content and "replaces_state" in ev.unsigned:
prev = yield self.get_event(
ev.unsigned["replaces_state"],
get_prev_content=False,
allow_none=True,
)
if prev:
ev.unsigned["prev_content"] = prev.content
ev.unsigned["prev_sender"] = prev.sender
self._get_event_cache.prefill(
(ev.event_id, check_redacted, get_prev_content), ev
cache_entry = _EventCacheEntry(
event=original_ev,
redacted_event=redacted_event,
)
defer.returnValue(ev)
self._get_event_cache.prefill((original_ev.event_id,), cache_entry)
defer.returnValue(cache_entry)
@defer.inlineCallbacks
def count_daily_messages(self):