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-rw-r--r--synapse/federation/federation_server.py29
1 files changed, 23 insertions, 6 deletions
diff --git a/synapse/federation/federation_server.py b/synapse/federation/federation_server.py
index 0f9302a6a8..98722ae543 100644
--- a/synapse/federation/federation_server.py
+++ b/synapse/federation/federation_server.py
@@ -162,8 +162,30 @@ class FederationServer(FederationBase):
                 p["age_ts"] = request_time - int(p["age"])
                 del p["age"]
 
+            # We try and pull out an event ID so that if later checks fail we
+            # can log something sensible. We don't mandate an event ID here in
+            # case future event formats get rid of the key.
+            possible_event_id = p.get("event_id", "<Unknown>")
+
+            # Now we get the room ID so that we can check that we know the
+            # version of the room.
+            room_id = p.get("room_id")
+            if not room_id:
+                logger.info(
+                    "Ignoring PDU as does not have a room_id. Event ID: %s",
+                    possible_event_id,
+                )
+                continue
+
+            try:
+                # In future we will actually use the room version to parse the
+                # PDU into an event.
+                yield self.store.get_room_version(room_id)
+            except NotFoundError:
+                logger.info("Ignoring PDU for unknown room_id: %s", room_id)
+                continue
+
             event = event_from_pdu_json(p)
-            room_id = event.room_id
             pdus_by_room.setdefault(room_id, []).append(event)
 
         pdu_results = {}
@@ -324,11 +346,6 @@ class FederationServer(FederationBase):
             defer.returnValue((404, ""))
 
     @defer.inlineCallbacks
-    @log_function
-    def on_pull_request(self, origin, versions):
-        raise NotImplementedError("Pull transactions not implemented")
-
-    @defer.inlineCallbacks
     def on_query_request(self, query_type, args):
         received_queries_counter.labels(query_type).inc()
         resp = yield self.registry.on_query(query_type, args)