Convert ReadWriteLock to async/await. (#8202)

synapse/handlers/pagination.py

@@ -14,15 +14,18 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import logging
+from typing import Any, Dict, Optional
 
 from twisted.python.failure import Failure
 
 from synapse.api.constants import EventTypes, Membership
 from synapse.api.errors import SynapseError
+from synapse.api.filtering import Filter
 from synapse.logging.context import run_in_background
 from synapse.metrics.background_process_metrics import run_as_background_process
 from synapse.storage.state import StateFilter
-from synapse.types import RoomStreamToken
+from synapse.streams.config import PaginationConfig
+from synapse.types import Requester, RoomStreamToken
 from synapse.util.async_helpers import ReadWriteLock
 from synapse.util.stringutils import random_string
 from synapse.visibility import filter_events_for_client
@@ -247,15 +250,16 @@ class PaginationHandler(object):
         )
         return purge_id
 
-    async def _purge_history(self, purge_id, room_id, token, delete_local_events):
+    async def _purge_history(
+        self, purge_id: str, room_id: str, token: str, delete_local_events: bool
+    ) -> None:
         """Carry out a history purge on a room.
 
         Args:
-            purge_id (str): The id for this purge
-            room_id (str): The room to purge from
-            token (str): topological token to delete events before
-            delete_local_events (bool): True to delete local events as well as
-                remote ones
+            purge_id: The id for this purge
+            room_id: The room to purge from
+            token: topological token to delete events before
+            delete_local_events: True to delete local events as well as remote ones
         """
         self._purges_in_progress_by_room.add(room_id)
         try:
@@ -291,9 +295,9 @@ class PaginationHandler(object):
         """
         return self._purges_by_id.get(purge_id)
 
-    async def purge_room(self, room_id):
+    async def purge_room(self, room_id: str) -> None:
         """Purge the given room from the database"""
-        with (await self.pagination_lock.write(room_id)):
+        with await self.pagination_lock.write(room_id):
             # check we know about the room
             await self.store.get_room_version_id(room_id)
 
@@ -307,23 +311,22 @@ class PaginationHandler(object):
 
     async def get_messages(
         self,
-        requester,
-        room_id=None,
-        pagin_config=None,
-        as_client_event=True,
-        event_filter=None,
-    ):
+        requester: Requester,
+        room_id: Optional[str] = None,
+        pagin_config: Optional[PaginationConfig] = None,
+        as_client_event: bool = True,
+        event_filter: Optional[Filter] = None,
+    ) -> Dict[str, Any]:
         """Get messages in a room.
 
         Args:
-            requester (Requester): The user requesting messages.
-            room_id (str): The room they want messages from.
-            pagin_config (synapse.api.streams.PaginationConfig): The pagination
-                config rules to apply, if any.
-            as_client_event (bool): True to get events in client-server format.
-            event_filter (Filter): Filter to apply to results or None
+            requester: The user requesting messages.
+            room_id: The room they want messages from.
+            pagin_config: The pagination config rules to apply, if any.
+            as_client_event: True to get events in client-server format.
+            event_filter: Filter to apply to results or None
         Returns:
-            dict: Pagination API results
+            Pagination API results
         """
         user_id = requester.user.to_string()
 
@@ -343,7 +346,7 @@ class PaginationHandler(object):
 
         source_config = pagin_config.get_source_config("room")
 
-        with (await self.pagination_lock.read(room_id)):
+        with await self.pagination_lock.read(room_id):
             (
                 membership,
                 member_event_id,