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Merge pull request #2944 from matrix-org/erikj/fix_sync_race

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Fix race in sync when joining room
This commit is contained in:
Erik Johnston 2018-03-07 17:42:26 +00:00 committed by GitHub
commit 735fd8719a
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3 changed files with 102 additions and 30 deletions
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103
synapse/handlers/sync.py
View File

@ -235,10 +235,10 @@ class SyncHandler(object):
defer.returnValue(rules)
@defer.inlineCallbacks
def ephemeral_by_room(self, sync_config, now_token, since_token=None):
def ephemeral_by_room(self, sync_result_builder, now_token, since_token=None):
"""Get the ephemeral events for each room the user is in
Args:
sync_config (SyncConfig): The flags, filters and user for the sync.
sync_result_builder(SyncResultBuilder)
now_token (StreamToken): Where the server is currently up to.
since_token (StreamToken): Where the server was when the client
last synced.
@ -248,10 +248,12 @@ class SyncHandler(object):
typing events for that room.
"""
sync_config = sync_result_builder.sync_config
with Measure(self.clock, "ephemeral_by_room"):
typing_key = since_token.typing_key if since_token else "0"
room_ids = yield self.store.get_rooms_for_user(sync_config.user.to_string())
room_ids = sync_result_builder.joined_room_ids
typing_source = self.event_sources.sources["typing"]
typing, typing_key = yield typing_source.get_new_events(
@ -565,10 +567,22 @@ class SyncHandler(object):
# Always use the `now_token` in `SyncResultBuilder`
now_token = yield self.event_sources.get_current_token()
user_id = sync_config.user.to_string()
app_service = self.store.get_app_service_by_user_id(user_id)
if app_service:
# We no longer support AS users using /sync directly.
# See https://github.com/matrix-org/matrix-doc/issues/1144
raise NotImplementedError()
else:
joined_room_ids = yield self.get_rooms_for_user_at(
user_id, now_token.room_stream_id,
)
sync_result_builder = SyncResultBuilder(
sync_config, full_state,
since_token=since_token,
now_token=now_token,
joined_room_ids=joined_room_ids,
)
account_data_by_room = yield self._generate_sync_entry_for_account_data(
@ -603,7 +617,6 @@ class SyncHandler(object):
device_id = sync_config.device_id
one_time_key_counts = {}
if device_id:
user_id = sync_config.user.to_string()
one_time_key_counts = yield self.store.count_e2e_one_time_keys(
user_id, device_id
)
@ -891,7 +904,7 @@ class SyncHandler(object):
ephemeral_by_room = {}
else:
now_token, ephemeral_by_room = yield self.ephemeral_by_room(
sync_result_builder.sync_config,
sync_result_builder,
now_token=sync_result_builder.now_token,
since_token=sync_result_builder.since_token,
)
@ -996,16 +1009,8 @@ class SyncHandler(object):
if rooms_changed:
defer.returnValue(True)
app_service = self.store.get_app_service_by_user_id(user_id)
if app_service:
# We no longer support AS users using /sync directly.
# See https://github.com/matrix-org/matrix-doc/issues/1144
raise NotImplementedError()
else:
joined_room_ids = yield self.store.get_rooms_for_user(user_id)
stream_id = RoomStreamToken.parse_stream_token(since_token.room_key).stream
for room_id in joined_room_ids:
for room_id in sync_result_builder.joined_room_ids:
if self.store.has_room_changed_since(room_id, stream_id):
defer.returnValue(True)
defer.returnValue(False)
@ -1029,14 +1034,6 @@ class SyncHandler(object):
assert since_token
app_service = self.store.get_app_service_by_user_id(user_id)
if app_service:
# We no longer support AS users using /sync directly.
# See https://github.com/matrix-org/matrix-doc/issues/1144
raise NotImplementedError()
else:
joined_room_ids = yield self.store.get_rooms_for_user(user_id)
# Get a list of membership change events that have happened.
rooms_changed = yield self.store.get_membership_changes_for_user(
user_id, since_token.room_key, now_token.room_key
@ -1059,7 +1056,7 @@ class SyncHandler(object):
# we do send down the room, and with full state, where necessary
old_state_ids = None
if room_id in joined_room_ids and non_joins:
if room_id in sync_result_builder.joined_room_ids and non_joins:
# Always include if the user (re)joined the room, especially
# important so that device list changes are calculated correctly.
# If there are non join member events, but we are still in the room,
@ -1069,7 +1066,7 @@ class SyncHandler(object):
# User is in the room so we don't need to do the invite/leave checks
continue
if room_id in joined_room_ids or has_join:
if room_id in sync_result_builder.joined_room_ids or has_join:
old_state_ids = yield self.get_state_at(room_id, since_token)
old_mem_ev_id = old_state_ids.get((EventTypes.Member, user_id), None)
old_mem_ev = None
@ -1081,7 +1078,7 @@ class SyncHandler(object):
newly_joined_rooms.append(room_id)
# If user is in the room then we don't need to do the invite/leave checks
if room_id in joined_room_ids:
if room_id in sync_result_builder.joined_room_ids:
continue
if not non_joins:
@ -1148,7 +1145,7 @@ class SyncHandler(object):
# Get all events for rooms we're currently joined to.
room_to_events = yield self.store.get_room_events_stream_for_rooms(
room_ids=joined_room_ids,
room_ids=sync_result_builder.joined_room_ids,
from_key=since_token.room_key,
to_key=now_token.room_key,
limit=timeline_limit + 1,
@ -1156,7 +1153,7 @@ class SyncHandler(object):
# We loop through all room ids, even if there are no new events, in case
# there are non room events taht we need to notify about.
for room_id in joined_room_ids:
for room_id in sync_result_builder.joined_room_ids:
room_entry = room_to_events.get(room_id, None)
if room_entry:
@ -1364,6 +1361,54 @@ class SyncHandler(object):
else:
raise Exception("Unrecognized rtype: %r", room_builder.rtype)
@defer.inlineCallbacks
def get_rooms_for_user_at(self, user_id, stream_ordering):
"""Get set of joined rooms for a user at the given stream ordering.
The stream ordering *must* be recent, otherwise this may throw an
exception if older than a month. (This function is called with the
current token, which should be perfectly fine).
Args:
user_id (str)
stream_ordering (int)
ReturnValue:
Deferred[frozenset[str]]: Set of room_ids the user is in at given
stream_ordering.
"""
joined_rooms = yield self.store.get_rooms_for_user_with_stream_ordering(
user_id,
)
joined_room_ids = set()
# We need to check that the stream ordering of the join for each room
# is before the stream_ordering asked for. This might not be the case
# if the user joins a room between us getting the current token and
# calling `get_rooms_for_user_with_stream_ordering`.
# If the membership's stream ordering is after the given stream
# ordering, we need to go and work out if the user was in the room
# before.
for room_id, membership_stream_ordering in joined_rooms:
if membership_stream_ordering <= stream_ordering:
joined_room_ids.add(room_id)
continue
logger.info("User joined room after current token: %s", room_id)
extrems = yield self.store.get_forward_extremeties_for_room(
room_id, stream_ordering,
)
users_in_room = yield self.state.get_current_user_in_room(
room_id, extrems,
)
if user_id in users_in_room:
joined_room_ids.add(room_id)
joined_room_ids = frozenset(joined_room_ids)
defer.returnValue(joined_room_ids)
def _action_has_highlight(actions):
for action in actions:
@ -1413,7 +1458,8 @@ def _calculate_state(timeline_contains, timeline_start, previous, current):
class SyncResultBuilder(object):
"Used to help build up a new SyncResult for a user"
def __init__(self, sync_config, full_state, since_token, now_token):
def __init__(self, sync_config, full_state, since_token, now_token,
joined_room_ids):
"""
Args:
sync_config(SyncConfig)
@ -1425,6 +1471,7 @@ class SyncResultBuilder(object):
self.full_state = full_state
self.since_token = since_token
self.now_token = now_token
self.joined_room_ids = joined_room_ids
self.presence = []
self.account_data = []

2
synapse/storage/events.py
View File

@ -754,7 +754,7 @@ class EventsStore(EventsWorkerStore):
for member in members_changed:
self._invalidate_cache_and_stream(
txn, self.get_rooms_for_user, (member,)
txn, self.get_rooms_for_user_with_stream_ordering, (member,)
)
for host in set(get_domain_from_id(u) for u in members_changed):

27
synapse/storage/roommember.py
View File

@ -38,6 +38,11 @@ RoomsForUser = namedtuple(
("room_id", "sender", "membership", "event_id", "stream_ordering")
)
GetRoomsForUserWithStreamOrdering = namedtuple(
"_GetRoomsForUserWithStreamOrdering",
("room_id", "stream_ordering",)
)
# We store this using a namedtuple so that we save about 3x space over using a
# dict.
@ -181,12 +186,32 @@ class RoomMemberWorkerStore(EventsWorkerStore):
return results
@cachedInlineCallbacks(max_entries=500000, iterable=True)
def get_rooms_for_user(self, user_id):
def get_rooms_for_user_with_stream_ordering(self, user_id):
"""Returns a set of room_ids the user is currently joined to
Args:
user_id (str)
Returns:
Deferred[frozenset[GetRoomsForUserWithStreamOrdering]]: Returns
the rooms the user is in currently, along with the stream ordering
of the most recent join for that user and room.
"""
rooms = yield self.get_rooms_for_user_where_membership_is(
user_id, membership_list=[Membership.JOIN],
)
defer.returnValue(frozenset(
GetRoomsForUserWithStreamOrdering(r.room_id, r.stream_ordering)
for r in rooms
))
@defer.inlineCallbacks
def get_rooms_for_user(self, user_id, on_invalidate=None):
"""Returns a set of room_ids the user is currently joined to
"""
rooms = yield self.get_rooms_for_user_with_stream_ordering(
user_id, on_invalidate=on_invalidate,
)
defer.returnValue(frozenset(r.room_id for r in rooms))
@cachedInlineCallbacks(max_entries=500000, cache_context=True, iterable=True)