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-rw-r--r--synapse/handlers/federation.py58
-rw-r--r--synapse/handlers/presence.py11
-rw-r--r--synapse/handlers/stats.py18
3 files changed, 66 insertions, 21 deletions
diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index cf4fad7de0..ac5ca79143 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -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)
 
-        yield self._update_auth_events_and_context_for_auth(
-            origin, event, context, auth_events
-        )
+        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):
@@ -2088,9 +2110,15 @@ class FederationHandler(BaseHandler):
                 missing_auth,
             )
             try:
-                remote_auth_chain = yield self.federation_client.get_event_auth(
-                    origin, event.room_id, event.event_id
-                )
+                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.
-            result = yield self.federation_client.query_auth(
-                origin,
-                event.room_id,
-                event.event_id,
-                local_auth_chain,
-            )
+            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"]]
diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py
index 6209858bbb..e49c8203ef 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -828,14 +828,17 @@ class PresenceHandler(object):
                 # joins.
                 continue
 
-            event = yield self.store.get_event(event_id)
-            if event.content.get("membership") != Membership.JOIN:
+            event = yield self.store.get_event(event_id, allow_none=True)
+            if not event or event.content.get("membership") != Membership.JOIN:
                 # We only care about joins
                 continue
 
             if prev_event_id:
-                prev_event = yield self.store.get_event(prev_event_id)
-                if prev_event.content.get("membership") == Membership.JOIN:
+                prev_event = yield self.store.get_event(prev_event_id, allow_none=True)
+                if (
+                    prev_event
+                    and prev_event.content.get("membership") == Membership.JOIN
+                ):
                     # Ignore changes to join events.
                     continue
 
diff --git a/synapse/handlers/stats.py b/synapse/handlers/stats.py
index 0e92b405ba..7ad16c8566 100644
--- a/synapse/handlers/stats.py
+++ b/synapse/handlers/stats.py
@@ -115,6 +115,7 @@ class StatsHandler(StateDeltasHandler):
             event_id = delta["event_id"]
             stream_id = delta["stream_id"]
             prev_event_id = delta["prev_event_id"]
+            stream_pos = delta["stream_id"]
 
             logger.debug("Handling: %r %r, %s", typ, state_key, event_id)
 
@@ -136,10 +137,15 @@ class StatsHandler(StateDeltasHandler):
             event_content = {}
 
             if event_id is not None:
-                event_content = (yield self.store.get_event(event_id)).content or {}
+                event = yield self.store.get_event(event_id, allow_none=True)
+                if event:
+                    event_content = event.content or {}
+
+            # We use stream_pos here rather than fetch by event_id as event_id
+            # may be None
+            now = yield self.store.get_received_ts_by_stream_pos(stream_pos)
 
             # quantise time to the nearest bucket
-            now = yield self.store.get_received_ts(event_id)
             now = (now // 1000 // self.stats_bucket_size) * self.stats_bucket_size
 
             if typ == EventTypes.Member:
@@ -149,9 +155,11 @@ class StatsHandler(StateDeltasHandler):
                 # compare them.
                 prev_event_content = {}
                 if prev_event_id is not None:
-                    prev_event_content = (
-                        yield self.store.get_event(prev_event_id)
-                    ).content
+                    prev_event = yield self.store.get_event(
+                        prev_event_id, allow_none=True,
+                    )
+                    if prev_event:
+                        prev_event_content = prev_event.content
 
                 membership = event_content.get("membership", Membership.LEAVE)
                 prev_membership = prev_event_content.get("membership", Membership.LEAVE)