Add concurrently_execute function

1 files changed, 7 insertions, 10 deletions

diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py

index ee99ded214..3e1d9282d7 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -23,7 +23,8 @@ from synapse.api.constants import (
     EventTypes, JoinRules, RoomCreationPreset,
 )
 from synapse.api.errors import AuthError, StoreError, SynapseError
-from synapse.util import stringutils, unwrapFirstError
+from synapse.util import stringutils
+from synapse.util.async import concurrently_execute
 from synapse.util.logcontext import preserve_context_over_fn
 from synapse.util.caches.response_cache import ResponseCache
 
@@ -368,6 +369,8 @@ class RoomListHandler(BaseHandler):
     def _get_public_room_list(self):
         room_ids = yield self.store.get_public_room_ids()
 
+        results = []
+
         @defer.inlineCallbacks
         def handle_room(room_id):
             aliases = yield self.store.get_aliases_for_room(room_id)
@@ -428,18 +431,12 @@ class RoomListHandler(BaseHandler):
             joined_users = yield self.store.get_users_in_room(room_id)
             result["num_joined_members"] = len(joined_users)
 
-            defer.returnValue(result)
+            results.append(result)
 
-        result = []
-        for chunk in (room_ids[i:i + 10] for i in xrange(0, len(room_ids), 10)):
-            chunk_result = yield defer.gatherResults([
-                handle_room(room_id)
-                for room_id in chunk
-            ], consumeErrors=True).addErrback(unwrapFirstError)
-            result.extend(v for v in chunk_result if v)
+        yield concurrently_execute(handle_room, room_ids, 10)
 
         # FIXME (erikj): START is no longer a valid value
-        defer.returnValue({"start": "START", "end": "END", "chunk": result})
+        defer.returnValue({"start": "START", "end": "END", "chunk": results})
 
 
 class RoomContextHandler(BaseHandler):