Update the room member handler to use async/await. (#7507)

1 files changed, 49 insertions, 62 deletions

diff --git a/synapse/handlers/room_member.py b/synapse/handlers/room_member.py
index ccc9659454..4ddeba4c97 100644
--- a/synapse/handlers/room_member.py
+++ b/synapse/handlers/room_member.py
@@ -20,8 +20,6 @@ import logging
 
 from six.moves import http_client
 
-from twisted.internet import defer
-
 from synapse import types
 from synapse.api.constants import EventTypes, Membership
 from synapse.api.errors import AuthError, Codes, SynapseError
@@ -76,7 +74,7 @@ class RoomMemberHandler(object):
         self.base_handler = BaseHandler(hs)
 
     @abc.abstractmethod
-    def _remote_join(self, requester, remote_room_hosts, room_id, user, content):
+    async def _remote_join(self, requester, remote_room_hosts, room_id, user, content):
         """Try and join a room that this server is not in
 
         Args:
@@ -94,7 +92,7 @@ class RoomMemberHandler(object):
         raise NotImplementedError()
 
     @abc.abstractmethod
-    def _remote_reject_invite(
+    async def _remote_reject_invite(
         self, requester, remote_room_hosts, room_id, target, content
     ):
         """Attempt to reject an invite for a room this server is not in. If we
@@ -115,7 +113,7 @@ class RoomMemberHandler(object):
         raise NotImplementedError()
 
     @abc.abstractmethod
-    def _user_joined_room(self, target, room_id):
+    async def _user_joined_room(self, target, room_id):
         """Notifies distributor on master process that the user has joined the
         room.
 
@@ -124,12 +122,12 @@ class RoomMemberHandler(object):
             room_id (str)
 
         Returns:
-            Deferred|None
+            None
         """
         raise NotImplementedError()
 
     @abc.abstractmethod
-    def _user_left_room(self, target, room_id):
+    async def _user_left_room(self, target, room_id):
         """Notifies distributor on master process that the user has left the
         room.
 
@@ -138,7 +136,7 @@ class RoomMemberHandler(object):
             room_id (str)
 
         Returns:
-            Deferred|None
+            None
         """
         raise NotImplementedError()
 
@@ -214,8 +212,9 @@ class RoomMemberHandler(object):
 
         return event
 
-    @defer.inlineCallbacks
-    def copy_room_tags_and_direct_to_room(self, old_room_id, new_room_id, user_id):
+    async def copy_room_tags_and_direct_to_room(
+        self, old_room_id, new_room_id, user_id
+    ):
         """Copies the tags and direct room state from one room to another.
 
         Args:
@@ -227,7 +226,7 @@ class RoomMemberHandler(object):
             Deferred[None]
         """
         # Retrieve user account data for predecessor room
-        user_account_data, _ = yield self.store.get_account_data_for_user(user_id)
+        user_account_data, _ = await self.store.get_account_data_for_user(user_id)
 
         # Copy direct message state if applicable
         direct_rooms = user_account_data.get("m.direct", {})
@@ -240,17 +239,17 @@ class RoomMemberHandler(object):
                     direct_rooms[key].append(new_room_id)
 
                     # Save back to user's m.direct account data
-                    yield self.store.add_account_data_for_user(
+                    await self.store.add_account_data_for_user(
                         user_id, "m.direct", direct_rooms
                     )
                     break
 
         # Copy room tags if applicable
-        room_tags = yield self.store.get_tags_for_room(user_id, old_room_id)
+        room_tags = await self.store.get_tags_for_room(user_id, old_room_id)
 
         # Copy each room tag to the new room
         for tag, tag_content in room_tags.items():
-            yield self.store.add_tag_to_room(user_id, new_room_id, tag, tag_content)
+            await self.store.add_tag_to_room(user_id, new_room_id, tag, tag_content)
 
     async def update_membership(
         self,
@@ -487,8 +486,7 @@ class RoomMemberHandler(object):
         )
         return res
 
-    @defer.inlineCallbacks
-    def transfer_room_state_on_room_upgrade(self, old_room_id, room_id):
+    async def transfer_room_state_on_room_upgrade(self, old_room_id, room_id):
         """Upon our server becoming aware of an upgraded room, either by upgrading a room
         ourselves or joining one, we can transfer over information from the previous room.
 
@@ -506,30 +504,29 @@ class RoomMemberHandler(object):
         logger.info("Transferring room state from %s to %s", old_room_id, room_id)
 
         # Find all local users that were in the old room and copy over each user's state
-        users = yield self.store.get_users_in_room(old_room_id)
-        yield self.copy_user_state_on_room_upgrade(old_room_id, room_id, users)
+        users = await self.store.get_users_in_room(old_room_id)
+        await self.copy_user_state_on_room_upgrade(old_room_id, room_id, users)
 
         # Add new room to the room directory if the old room was there
         # Remove old room from the room directory
-        old_room = yield self.store.get_room(old_room_id)
+        old_room = await self.store.get_room(old_room_id)
         if old_room and old_room["is_public"]:
-            yield self.store.set_room_is_public(old_room_id, False)
-            yield self.store.set_room_is_public(room_id, True)
+            await self.store.set_room_is_public(old_room_id, False)
+            await self.store.set_room_is_public(room_id, True)
 
         # Transfer alias mappings in the room directory
-        yield self.store.update_aliases_for_room(old_room_id, room_id)
+        await self.store.update_aliases_for_room(old_room_id, room_id)
 
         # Check if any groups we own contain the predecessor room
-        local_group_ids = yield self.store.get_local_groups_for_room(old_room_id)
+        local_group_ids = await self.store.get_local_groups_for_room(old_room_id)
         for group_id in local_group_ids:
             # Add new the new room to those groups
-            yield self.store.add_room_to_group(group_id, room_id, old_room["is_public"])
+            await self.store.add_room_to_group(group_id, room_id, old_room["is_public"])
 
             # Remove the old room from those groups
-            yield self.store.remove_room_from_group(group_id, old_room_id)
+            await self.store.remove_room_from_group(group_id, old_room_id)
 
-    @defer.inlineCallbacks
-    def copy_user_state_on_room_upgrade(self, old_room_id, new_room_id, user_ids):
+    async def copy_user_state_on_room_upgrade(self, old_room_id, new_room_id, user_ids):
         """Copy user-specific information when they join a new room when that new room is the
         result of a room upgrade
 
@@ -552,11 +549,11 @@ class RoomMemberHandler(object):
         for user_id in user_ids:
             try:
                 # It is an upgraded room. Copy over old tags
-                yield self.copy_room_tags_and_direct_to_room(
+                await self.copy_room_tags_and_direct_to_room(
                     old_room_id, new_room_id, user_id
                 )
                 # Copy over push rules
-                yield self.store.copy_push_rules_from_room_to_room_for_user(
+                await self.store.copy_push_rules_from_room_to_room_for_user(
                     old_room_id, new_room_id, user_id
                 )
             except Exception:
@@ -639,8 +636,7 @@ class RoomMemberHandler(object):
                 if prev_member_event.membership == Membership.JOIN:
                     await self._user_left_room(target_user, room_id)
 
-    @defer.inlineCallbacks
-    def _can_guest_join(self, current_state_ids):
+    async def _can_guest_join(self, current_state_ids):
         """
         Returns whether a guest can join a room based on its current state.
         """
@@ -648,7 +644,7 @@ class RoomMemberHandler(object):
         if not guest_access_id:
             return False
 
-        guest_access = yield self.store.get_event(guest_access_id)
+        guest_access = await self.store.get_event(guest_access_id)
 
         return (
             guest_access
@@ -657,8 +653,7 @@ class RoomMemberHandler(object):
             and guest_access.content["guest_access"] == "can_join"
         )
 
-    @defer.inlineCallbacks
-    def lookup_room_alias(self, room_alias):
+    async def lookup_room_alias(self, room_alias):
         """
         Get the room ID associated with a room alias.
 
@@ -672,7 +667,7 @@ class RoomMemberHandler(object):
             SynapseError if room alias could not be found.
         """
         directory_handler = self.directory_handler
-        mapping = yield directory_handler.get_association(room_alias)
+        mapping = await directory_handler.get_association(room_alias)
 
         if not mapping:
             raise SynapseError(404, "No such room alias")
@@ -687,9 +682,8 @@ class RoomMemberHandler(object):
 
         return RoomID.from_string(room_id), servers
 
-    @defer.inlineCallbacks
-    def _get_inviter(self, user_id, room_id):
-        invite = yield self.store.get_invite_for_local_user_in_room(
+    async def _get_inviter(self, user_id, room_id):
+        invite = await self.store.get_invite_for_local_user_in_room(
             user_id=user_id, room_id=room_id
         )
         if invite:
@@ -836,8 +830,7 @@ class RoomMemberHandler(object):
             txn_id=txn_id,
         )
 
-    @defer.inlineCallbacks
-    def _is_host_in_room(self, current_state_ids):
+    async def _is_host_in_room(self, current_state_ids):
         # Have we just created the room, and is this about to be the very
         # first member event?
         create_event_id = current_state_ids.get(("m.room.create", ""))
@@ -850,7 +843,7 @@ class RoomMemberHandler(object):
                 continue
 
             event_id = current_state_ids[(etype, state_key)]
-            event = yield self.store.get_event(event_id, allow_none=True)
+            event = await self.store.get_event(event_id, allow_none=True)
             if not event:
                 continue
 
@@ -859,11 +852,10 @@ class RoomMemberHandler(object):
 
         return False
 
-    @defer.inlineCallbacks
-    def _is_server_notice_room(self, room_id):
+    async def _is_server_notice_room(self, room_id):
         if self._server_notices_mxid is None:
             return False
-        user_ids = yield self.store.get_users_in_room(room_id)
+        user_ids = await self.store.get_users_in_room(room_id)
         return self._server_notices_mxid in user_ids
 
 
@@ -895,8 +887,7 @@ class RoomMemberMasterHandler(RoomMemberHandler):
             return complexity["v1"] > max_complexity
         return None
 
-    @defer.inlineCallbacks
-    def _is_local_room_too_complex(self, room_id):
+    async def _is_local_room_too_complex(self, room_id):
         """
         Check if the complexity of a local room is too great.
 
@@ -906,7 +897,7 @@ class RoomMemberMasterHandler(RoomMemberHandler):
         Returns: bool
         """
         max_complexity = self.hs.config.limit_remote_rooms.complexity
-        complexity = yield self.store.get_room_complexity(room_id)
+        complexity = await self.store.get_room_complexity(room_id)
 
         return complexity["v1"] > max_complexity
 
@@ -969,18 +960,15 @@ class RoomMemberMasterHandler(RoomMemberHandler):
                 errcode=Codes.RESOURCE_LIMIT_EXCEEDED,
             )
 
-    @defer.inlineCallbacks
-    def _remote_reject_invite(
+    async def _remote_reject_invite(
         self, requester, remote_room_hosts, room_id, target, content
     ):
         """Implements RoomMemberHandler._remote_reject_invite
         """
         fed_handler = self.federation_handler
         try:
-            ret = yield defer.ensureDeferred(
-                fed_handler.do_remotely_reject_invite(
-                    remote_room_hosts, room_id, target.to_string(), content=content,
-                )
+            ret = await fed_handler.do_remotely_reject_invite(
+                remote_room_hosts, room_id, target.to_string(), content=content,
             )
             return ret
         except Exception as e:
@@ -992,24 +980,23 @@ class RoomMemberMasterHandler(RoomMemberHandler):
             #
             logger.warning("Failed to reject invite: %s", e)
 
-            yield self.store.locally_reject_invite(target.to_string(), room_id)
+            await self.store.locally_reject_invite(target.to_string(), room_id)
             return {}
 
-    def _user_joined_room(self, target, room_id):
+    async def _user_joined_room(self, target, room_id):
         """Implements RoomMemberHandler._user_joined_room
         """
-        return defer.succeed(user_joined_room(self.distributor, target, room_id))
+        return user_joined_room(self.distributor, target, room_id)
 
-    def _user_left_room(self, target, room_id):
+    async def _user_left_room(self, target, room_id):
         """Implements RoomMemberHandler._user_left_room
         """
-        return defer.succeed(user_left_room(self.distributor, target, room_id))
+        return user_left_room(self.distributor, target, room_id)
 
-    @defer.inlineCallbacks
-    def forget(self, user, room_id):
+    async def forget(self, user, room_id):
         user_id = user.to_string()
 
-        member = yield self.state_handler.get_current_state(
+        member = await self.state_handler.get_current_state(
             room_id=room_id, event_type=EventTypes.Member, state_key=user_id
         )
         membership = member.membership if member else None
@@ -1021,4 +1008,4 @@ class RoomMemberMasterHandler(RoomMemberHandler):
             raise SynapseError(400, "User %s in room %s" % (user_id, room_id))
 
         if membership:
-            yield self.store.forget(user_id, room_id)
+            await self.store.forget(user_id, room_id)