From 4db394a4b3e9c823655cdd3e716a5f234107d337 Mon Sep 17 00:00:00 2001
From: Richard van der Hoff <richard@matrix.org>
Date: Tue, 10 Dec 2019 17:25:18 +0000
Subject: [PATCH] convert to async: FederationHandler._get_state_for_room

... and _get_events_from_store_or_dest
---
 synapse/handlers/federation.py | 42 +++++++++++++++++-----------------
 1 file changed, 21 insertions(+), 21 deletions(-)

diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index 01d9c5120e..724cae9647 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -19,7 +19,7 @@
 
 import itertools
 import logging
-from typing import Dict, Iterable, Optional, Sequence, Tuple
+from typing import Dict, Iterable, List, Optional, Sequence, Tuple
 
 import six
 from six import iteritems, itervalues
@@ -579,30 +579,30 @@ class FederationHandler(BaseHandler):
                     else:
                         raise
 
-    @defer.inlineCallbacks
     @log_function
-    def _get_state_for_room(self, destination, room_id, event_id):
+    async def _get_state_for_room(
+        self, destination: str, room_id: str, event_id: str
+    ) -> Tuple[List[EventBase], List[EventBase]]:
         """Requests all of the room state at a given event from a remote homeserver.
 
         Args:
-            destination (str): The remote homeserver to query for the state.
-            room_id (str): The id of the room we're interested in.
-            event_id (str): The id of the event we want the state at.
+            destination:: The remote homeserver to query for the state.
+            room_id: The id of the room we're interested in.
+            event_id: The id of the event we want the state at.
 
         Returns:
-            Deferred[Tuple[List[EventBase], List[EventBase]]]:
-                A list of events in the state, and a list of events in the auth chain
-                for the given event.
+            A list of events in the state, and a list of events in the auth chain
+            for the given event.
         """
         (
             state_event_ids,
             auth_event_ids,
-        ) = yield self.federation_client.get_room_state_ids(
+        ) = await self.federation_client.get_room_state_ids(
             destination, room_id, event_id=event_id
         )
 
         desired_events = set(state_event_ids + auth_event_ids)
-        event_map = yield self._get_events_from_store_or_dest(
+        event_map = await self._get_events_from_store_or_dest(
             destination, room_id, desired_events
         )
 
@@ -621,20 +621,20 @@ class FederationHandler(BaseHandler):
 
         return pdus, auth_chain
 
-    @defer.inlineCallbacks
-    def _get_events_from_store_or_dest(self, destination, room_id, event_ids):
+    async def _get_events_from_store_or_dest(
+        self, destination: str, room_id: str, event_ids: Iterable[str]
+    ) -> Dict[str, EventBase]:
         """Fetch events from a remote destination, checking if we already have them.
 
         Args:
-            destination (str)
-            room_id (str)
-            event_ids (Iterable[str])
+            destination
+            room_id
+            event_ids
 
         Returns:
-            Deferred[dict[str, EventBase]]: A deferred resolving to a map
-            from event_id to event
+            map from event_id to event
         """
-        fetched_events = yield self.store.get_events(event_ids, allow_rejected=True)
+        fetched_events = await self.store.get_events(event_ids, allow_rejected=True)
 
         missing_events = set(event_ids) - fetched_events.keys()
 
@@ -647,7 +647,7 @@ class FederationHandler(BaseHandler):
             event_ids,
         )
 
-        room_version = yield self.store.get_room_version(room_id)
+        room_version = await self.store.get_room_version(room_id)
 
         # XXX 20 requests at once? really?
         for batch in batch_iter(missing_events, 20):
@@ -661,7 +661,7 @@ class FederationHandler(BaseHandler):
                 for e_id in batch
             ]
 
-            res = yield make_deferred_yieldable(
+            res = await make_deferred_yieldable(
                 defer.DeferredList(deferreds, consumeErrors=True)
             )
             for success, result in res: