During room intial sync, only calculate current state once.

synapse/api/auth.py

@@ -89,20 +89,27 @@ def check(self, event, auth_events):
             raise
 
     @defer.inlineCallbacks
-    def check_joined_room(self, room_id, user_id):
-        member = yield self.state.get_current_state(
-            room_id=room_id,
-            event_type=EventTypes.Member,
-            state_key=user_id
-        )
+    def check_joined_room(self, room_id, user_id, current_state=None):
+        if current_state:
+            member = current_state.get(
+                (EventTypes.Member, user_id),
+                None
+            )
+        else:
+            member = yield self.state.get_current_state(
+                room_id=room_id,
+                event_type=EventTypes.Member,
+                state_key=user_id
+            )
+
         self._check_joined_room(member, user_id, room_id)
         defer.returnValue(member)
 
     @defer.inlineCallbacks
     def check_host_in_room(self, room_id, host):
         curr_state = yield self.state.get_current_state(room_id)
 
-        for event in curr_state:
+        for event in curr_state.values():
             if event.type == EventTypes.Member:
                 try:
                     if UserID.from_string(event.state_key).domain != host:

synapse/handlers/message.py

@@ -35,6 +35,7 @@ class MessageHandler(BaseHandler):
     def __init__(self, hs):
         super(MessageHandler, self).__init__(hs)
         self.hs = hs
+        self.state = hs.get_state_handler()
         self.clock = hs.get_clock()
         self.validator = EventValidator()
 
@@ -225,7 +226,9 @@ def get_state_events(self, user_id, room_id):
         # TODO: This is duplicating logic from snapshot_all_rooms
         current_state = yield self.state_handler.get_current_state(room_id)
         now = self.clock.time_msec()
-        defer.returnValue([serialize_event(c, now) for c in current_state])
+        defer.returnValue(
+            [serialize_event(c, now) for c in current_state.values()]
+        )
 
     @defer.inlineCallbacks
     def snapshot_all_rooms(self, user_id=None, pagin_config=None,
@@ -313,7 +316,7 @@ def snapshot_all_rooms(self, user_id=None, pagin_config=None,
                 )
                 d["state"] = [
                     serialize_event(c, time_now, as_client_event)
-                    for c in current_state
+                    for c in current_state.values()
                 ]
             except:
                 logger.exception("Failed to get snapshot")
@@ -329,21 +332,27 @@ def snapshot_all_rooms(self, user_id=None, pagin_config=None,
     @defer.inlineCallbacks
     def room_initial_sync(self, user_id, room_id, pagin_config=None,
                           feedback=False):
-        yield self.auth.check_joined_room(room_id, user_id)
+        current_state = yield self.state.get_current_state(
+            room_id=room_id,
+        )
+
+        yield self.auth.check_joined_room(
+            room_id, user_id,
+            current_state=current_state
+        )
 
         # TODO(paul): I wish I was called with user objects not user_id
         #   strings...
         auth_user = UserID.from_string(user_id)
 
         # TODO: These concurrently
         time_now = self.clock.time_msec()
-        state_tuples = yield self.state_handler.get_current_state(room_id)
-        state = [serialize_event(x, time_now) for x in state_tuples]
+        state = [
+            serialize_event(x, time_now)
+            for x in current_state.values()
+        ]
 
-        member_event = (yield self.store.get_room_member(
-            user_id=user_id,
-            room_id=room_id
-        ))
+        member_event = current_state.get((EventTypes.Member, user_id,))
 
         now_token = yield self.hs.get_event_sources().get_current_token()
 
@@ -360,7 +369,10 @@ def room_initial_sync(self, user_id, room_id, pagin_config=None,
         start_token = now_token.copy_and_replace("room_key", token[0])
         end_token = now_token.copy_and_replace("room_key", token[1])
 
-        room_members = yield self.store.get_room_members(room_id)
+        room_members = [
+            m for m in current_state.values()
+            if m.type == EventTypes.Member
+        ]
 
         presence_handler = self.hs.get_handlers().presence_handler
         presence = []

synapse/handlers/sync.py

@@ -175,9 +175,10 @@ def initial_sync_for_room(self, room_id, sync_config, now_token,
             room_id, sync_config, now_token,
         )
 
-        current_state_events = yield self.state_handler.get_current_state(
+        current_state = yield self.state_handler.get_current_state(
             room_id
         )
+        current_state_events = current_state.values()
 
         defer.returnValue(RoomSyncResult(
             room_id=room_id,
@@ -347,9 +348,10 @@ def incremental_sync_with_gap_for_room(self, room_id, sync_config,
 
         # TODO(mjark): This seems racy since this isn't being passed a
         # token to indicate what point in the stream this is
-        current_state_events = yield self.state_handler.get_current_state(
+        current_state = yield self.state_handler.get_current_state(
             room_id
         )
+        current_state_events = current_state.values()
 
         state_at_previous_sync = yield self.get_state_at_previous_sync(
             room_id, since_token=since_token
@@ -431,6 +433,7 @@ def check_joined_room(self, sync_config, room_id, state_delta):
                     joined = True
 
         if joined:
-            state_delta = yield self.state_handler.get_current_state(room_id)
+            res = yield self.state_handler.get_current_state(room_id)
+            state_delta = res.values()
 
         defer.returnValue(state_delta)

synapse/state.py

@@ -76,7 +76,7 @@ def get_current_state(self, room_id, event_type=None, state_key=""):
             defer.returnValue(res[1].get((event_type, state_key)))
             return
 
-        defer.returnValue(res[1].values())
+        defer.returnValue(res[1])
 
     @defer.inlineCallbacks
     def compute_event_context(self, event, old_state=None):