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Merge pull request #5317 from matrix-org/erikj/make_do_auth_non_essential

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Fix handling of failures when calling /event_auth.
This commit is contained in:
Erik Johnston 2019-06-05 14:01:32 +01:00 committed by GitHub
commit d53faa40e9
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2 changed files with 47 additions and 12 deletions
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changelog.d/5317.bugfix Normal file
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@ -0,0 +1 @@
Fix handling of failures when processing incoming events where calling `/event_auth` on remote server fails.

34
synapse/handlers/federation.py
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@ -35,6 +35,7 @@ from synapse.api.errors import (
CodeMessageException,
FederationDeniedError,
FederationError,
RequestSendFailed,
StoreError,
SynapseError,
)
@ -2027,9 +2028,21 @@ class FederationHandler(BaseHandler):
"""
room_version = yield self.store.get_room_version(event.room_id)
try:
yield self._update_auth_events_and_context_for_auth(
origin, event, context, auth_events
)
except Exception:
# We don't really mind if the above fails, so lets not fail
# processing if it does. However, it really shouldn't fail so
# let's still log as an exception since we'll still want to fix
# any bugs.
logger.exception(
"Failed to double check auth events for %s with remote. "
"Ignoring failure and continuing processing of event.",
event.event_id,
)
try:
self.auth.check(room_version, event, auth_events=auth_events)
except AuthError as e:
@ -2042,6 +2055,15 @@ class FederationHandler(BaseHandler):
):
"""Helper for do_auth. See there for docs.
Checks whether a given event has the expected auth events. If it
doesn't then we talk to the remote server to compare state to see if
we can come to a consensus (e.g. if one server missed some valid
state).
This attempts to resovle any potential divergence of state between
servers, but is not essential and so failures should not block further
processing of the event.
Args:
origin (str):
event (synapse.events.EventBase):
@ -2087,10 +2109,16 @@ class FederationHandler(BaseHandler):
"auth_events contains unknown events: %s",
missing_auth,
)
try:
try:
remote_auth_chain = yield self.federation_client.get_event_auth(
origin, event.room_id, event.event_id
)
except RequestSendFailed as e:
# The other side isn't around or doesn't implement the
# endpoint, so lets just bail out.
logger.info("Failed to get event auth from remote: %s", e)
return
seen_remotes = yield self.store.have_seen_events(
[e.event_id for e in remote_auth_chain]
@ -2236,12 +2264,18 @@ class FederationHandler(BaseHandler):
try:
# 2. Get remote difference.
try:
result = yield self.federation_client.query_auth(
origin,
event.room_id,
event.event_id,
local_auth_chain,
)
except RequestSendFailed as e:
# The other side isn't around or doesn't implement the
# endpoint, so lets just bail out.
logger.info("Failed to query auth from remote: %s", e)
return
seen_remotes = yield self.store.have_seen_events(
[e.event_id for e in result["auth_chain"]]