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Merge pull request #3968 from matrix-org/rav/fix_federation_errors
Fix exceptions when handling incoming transactions
This commit is contained in:
Richard van der Hoff
GitHub
commit
b5b93f45d5
3 changed files with 47 additions and 118 deletions
1
changelog.d/3968.bugfix
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1
changelog.d/3968.bugfix
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@ -0,0 +1 @@
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Fix exceptions when processing incoming events over federation
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@ -106,7 +106,7 @@ class FederationHandler(BaseHandler):
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self.hs = hs
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self.store = hs.get_datastore()
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self.store = hs.get_datastore() # type: synapse.storage.DataStore
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self.federation_client = hs.get_federation_client()
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self.state_handler = hs.get_state_handler()
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self.server_name = hs.hostname
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@ -323,14 +323,22 @@ class FederationHandler(BaseHandler):
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affected=pdu.event_id,
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)
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# Calculate the state of the previous events, and
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# de-conflict them to find the current state.
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state_groups = []
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# Calculate the state after each of the previous events, and
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# resolve them to find the correct state at the current event.
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auth_chains = set()
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event_map = {
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event_id: pdu,
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}
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try:
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# Get the state of the events we know about
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ours = yield self.store.get_state_groups(room_id, list(seen))
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state_groups.append(ours)
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ours = yield self.store.get_state_groups_ids(room_id, seen)
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# state_maps is a list of mappings from (type, state_key) to event_id
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# type: list[dict[tuple[str, str], str]]
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state_maps = list(ours.values())
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# we don't need this any more, let's delete it.
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del ours
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# Ask the remote server for the states we don't
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# know about
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@ -350,28 +358,54 @@ class FederationHandler(BaseHandler):
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)
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)
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# we want the state *after* p; get_state_for_room returns the
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# state *before* p.
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remote_event = yield self.federation_client.get_pdu(
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[origin], p, outlier=True,
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)
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if remote_event is None:
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raise Exception(
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"Unable to get missing prev_event %s" % (p, )
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)
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if remote_event.is_state():
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remote_state.append(remote_event)
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# XXX hrm I'm not convinced that duplicate events will compare
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# for equality, so I'm not sure this does what the author
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# hoped.
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auth_chains.update(got_auth_chain)
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state_group = {
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remote_state_map = {
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(x.type, x.state_key): x.event_id for x in remote_state
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}
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state_groups.append(state_group)
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state_maps.append(remote_state_map)
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for x in remote_state:
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event_map[x.event_id] = x
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# Resolve any conflicting state
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@defer.inlineCallbacks
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def fetch(ev_ids):
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return self.store.get_events(
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ev_ids, get_prev_content=False, check_redacted=False
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fetched = yield self.store.get_events(
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ev_ids, get_prev_content=False, check_redacted=False,
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)
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# add any events we fetch here to the `event_map` so that we
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# can use them to build the state event list below.
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event_map.update(fetched)
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defer.returnValue(fetched)
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room_version = yield self.store.get_room_version(room_id)
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state_map = yield resolve_events_with_factory(
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room_version, state_groups, {event_id: pdu}, fetch
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room_version, state_maps, event_map, fetch,
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)
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state = (yield self.store.get_events(state_map.values())).values()
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# we need to give _process_received_pdu the actual state events
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# rather than event ids, so generate that now.
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state = [
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event_map[e] for e in six.itervalues(state_map)
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]
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auth_chain = list(auth_chains)
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except Exception:
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logger.warn(
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@ -141,109 +141,3 @@ class MessageAcceptTests(unittest.TestCase):
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self.homeserver.datastore.get_latest_event_ids_in_room, self.room_id
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)
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self.assertEqual(self.successResultOf(extrem)[0], "$join:test.serv")
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def test_cant_hide_past_history(self):
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"""
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If you send a message, you must be able to provide the direct
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prev_events that said event references.
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"""
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def post_json(destination, path, data, headers=None, timeout=0):
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if path.startswith("/_matrix/federation/v1/get_missing_events/"):
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return {
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"events": [
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{
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"room_id": self.room_id,
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"sender": "@baduser:test.serv",
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"event_id": "three:test.serv",
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"depth": 1000,
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"origin_server_ts": 1,
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"type": "m.room.message",
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"origin": "test.serv",
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"content": "hewwo?",
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"auth_events": [],
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"prev_events": [("four:test.serv", {})],
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}
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]
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}
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self.http_client.post_json = post_json
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def get_json(destination, path, args, headers=None):
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if path.startswith("/_matrix/federation/v1/state_ids/"):
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d = self.successResultOf(
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self.homeserver.datastore.get_state_ids_for_event("one:test.serv")
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)
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return succeed(
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{
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"pdu_ids": [
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y
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for x, y in d.items()
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if x == ("m.room.member", "@us:test")
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],
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"auth_chain_ids": list(d.values()),
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}
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)
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self.http_client.get_json = get_json
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# Figure out what the most recent event is
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most_recent = self.successResultOf(
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maybeDeferred(
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self.homeserver.datastore.get_latest_event_ids_in_room, self.room_id
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)
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)[0]
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# Make a good event
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good_event = FrozenEvent(
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{
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"room_id": self.room_id,
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"sender": "@baduser:test.serv",
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"event_id": "one:test.serv",
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"depth": 1000,
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"origin_server_ts": 1,
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"type": "m.room.message",
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"origin": "test.serv",
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"content": "hewwo?",
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"auth_events": [],
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"prev_events": [(most_recent, {})],
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}
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)
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with LoggingContext(request="good_event"):
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d = self.handler.on_receive_pdu(
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"test.serv", good_event, sent_to_us_directly=True
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)
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self.reactor.advance(1)
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self.assertEqual(self.successResultOf(d), None)
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bad_event = FrozenEvent(
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{
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"room_id": self.room_id,
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"sender": "@baduser:test.serv",
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"event_id": "two:test.serv",
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"depth": 1000,
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"origin_server_ts": 1,
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"type": "m.room.message",
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"origin": "test.serv",
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"content": "hewwo?",
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"auth_events": [],
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"prev_events": [("one:test.serv", {}), ("three:test.serv", {})],
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}
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)
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with LoggingContext(request="bad_event"):
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d = self.handler.on_receive_pdu(
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"test.serv", bad_event, sent_to_us_directly=True
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)
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self.reactor.advance(1)
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extrem = maybeDeferred(
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self.homeserver.datastore.get_latest_event_ids_in_room, self.room_id
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)
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self.assertEqual(self.successResultOf(extrem)[0], "two:test.serv")
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state = self.homeserver.get_state_handler().get_current_state_ids(self.room_id)
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self.reactor.advance(1)
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self.assertIn(("m.room.member", "@us:test"), self.successResultOf(state).keys())
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