Bump mypy from 1.11.2 to 1.12.1 and fix new typechecking errors (#17999)

Supersedes https://github.com/element-hq/synapse/pull/17958.

Awkwardly, the changes made to fix the mypy errors in 1.12.1 cause
errors in 1.11.2. So you'll need to update your mypy version to 1.12.1
to eliminate typechecking errors during developing.

changelog.d/17999.misc

@@ -0,0 +1 @@
+Bump mypy from 1.11.2 to 1.12.1.

poetry.lock

@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 1.8.3 and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.8.4 and should not be changed by hand.
 
 [[package]]
 name = "annotated-types"
@@ -1314,38 +1314,43 @@ files = [
 
 [[package]]
 name = "mypy"
-version = "1.11.2"
+version = "1.12.1"
 description = "Optional static typing for Python"
 optional = false
 python-versions = ">=3.8"
 files = [
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+    {file = "mypy-1.12.1.tar.gz", hash = "sha256:f5b3936f7a6d0e8280c9bdef94c7ce4847f5cdfc258fbb2c29a8c1711e8bb96d"},
 ]
 
 [package.dependencies]
@@ -3133,4 +3138,4 @@ user-search = ["pyicu"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.9.0"
-content-hash = "d71159b19349fdc0b7cd8e06e8c8778b603fc37b941c6df34ddc31746783d94d"
+content-hash = "170c8bc97d4cd16a38a98ed9d48bef0ef09c994d8b129160ef262306cf689db7"

synapse/config/repository.py

@@ -22,7 +22,7 @@
 import logging
 import os
 from typing import Any, Dict, List, Tuple
-from urllib.request import getproxies_environment  # type: ignore
+from urllib.request import getproxies_environment
 
 import attr
 

synapse/handlers/appservice.py

@@ -896,10 +896,10 @@ class ApplicationServicesHandler:
         results = await make_deferred_yieldable(
             defer.DeferredList(
                 [
-                    run_in_background(
+                    run_in_background(  # type: ignore[call-overload]
                         self.appservice_api.claim_client_keys,
                         # We know this must be an app service.
-                        self.store.get_app_service_by_id(service_id),  # type: ignore[arg-type]
+                        self.store.get_app_service_by_id(service_id),
                         service_query,
                     )
                     for service_id, service_query in query_by_appservice.items()
@@ -952,10 +952,10 @@ class ApplicationServicesHandler:
         results = await make_deferred_yieldable(
             defer.DeferredList(
                 [
-                    run_in_background(
+                    run_in_background(  # type: ignore[call-overload]
                         self.appservice_api.query_keys,
                         # We know this must be an app service.
-                        self.store.get_app_service_by_id(service_id),  # type: ignore[arg-type]
+                        self.store.get_app_service_by_id(service_id),
                         service_query,
                     )
                     for service_id, service_query in query_by_appservice.items()

synapse/push/bulk_push_rule_evaluator.py

@@ -371,7 +371,7 @@ class BulkPushRuleEvaluator:
                 "Deferred[Tuple[int, Tuple[dict, Optional[int]], Dict[str, Dict[str, JsonValue]], Mapping[str, ProfileInfo]]]",
                 gather_results(
                     (
-                        run_in_background(  # type: ignore[call-arg]
+                        run_in_background(  # type: ignore[call-overload]
                             self.store.get_number_joined_users_in_room,
                             event.room_id,  # type: ignore[arg-type]
                         ),
@@ -382,10 +382,10 @@ class BulkPushRuleEvaluator:
                             event_id_to_event,
                         ),
                         run_in_background(self._related_events, event),
-                        run_in_background(  # type: ignore[call-arg]
+                        run_in_background(  # type: ignore[call-overload]
                             self.store.get_subset_users_in_room_with_profiles,
-                            event.room_id,  # type: ignore[arg-type]
-                            rules_by_user.keys(),  # type: ignore[arg-type]
+                            event.room_id,
+                            rules_by_user.keys(),
                         ),
                     ),
                     consumeErrors=True,

synapse/rest/client/room.py

@@ -783,9 +783,9 @@ class RoomMessageListRestServlet(RestServlet):
         # decorator on `get_number_joined_users_in_room` doesn't play well with
         # the type system. Maybe in the future, it can use some ParamSpec
         # wizardry to fix it up.
-        room_member_count_deferred = run_in_background(  # type: ignore[call-arg]
+        room_member_count_deferred = run_in_background(  # type: ignore[call-overload]
             self.store.get_number_joined_users_in_room,
-            room_id,  # type: ignore[arg-type]
+            room_id,
         )
 
         requester = await self.auth.get_user_by_req(request, allow_guest=True)

tests/replication/http/test__base.py

@@ -46,7 +46,7 @@ class CancellableReplicationEndpoint(ReplicationEndpoint):
         self.clock = hs.get_clock()
 
     @staticmethod
-    async def _serialize_payload() -> JsonDict:
+    async def _serialize_payload(**kwargs: ReplicationEndpoint) -> JsonDict:
         return {}
 
     @cancellable
@@ -68,7 +68,7 @@ class UncancellableReplicationEndpoint(ReplicationEndpoint):
         self.clock = hs.get_clock()
 
     @staticmethod
-    async def _serialize_payload() -> JsonDict:
+    async def _serialize_payload(**kwargs: ReplicationEndpoint) -> JsonDict:
         return {}
 
     async def _handle_request(  # type: ignore[override]