Add type hints to some handlers (#8505)

synapse/handlers/devicemessage.py

@@ -14,7 +14,7 @@
 # limitations under the License.
 
 import logging
-from typing import Any, Dict
+from typing import TYPE_CHECKING, Any, Dict
 
 from synapse.api.errors import SynapseError
 from synapse.logging.context import run_in_background
@@ -24,18 +24,22 @@ from synapse.logging.opentracing import (
     set_tag,
     start_active_span,
 )
-from synapse.types import UserID, get_domain_from_id
+from synapse.types import JsonDict, UserID, get_domain_from_id
 from synapse.util import json_encoder
 from synapse.util.stringutils import random_string
 
+if TYPE_CHECKING:
+    from synapse.app.homeserver import HomeServer
+
+
 logger = logging.getLogger(__name__)
 
 
 class DeviceMessageHandler:
-    def __init__(self, hs):
+    def __init__(self, hs: "HomeServer"):
         """
         Args:
-            hs (synapse.server.HomeServer): server
+            hs: server
         """
         self.store = hs.get_datastore()
         self.notifier = hs.get_notifier()
@@ -48,7 +52,7 @@ class DeviceMessageHandler:
 
         self._device_list_updater = hs.get_device_handler().device_list_updater
 
-    async def on_direct_to_device_edu(self, origin, content):
+    async def on_direct_to_device_edu(self, origin: str, content: JsonDict) -> None:
         local_messages = {}
         sender_user_id = content["sender"]
         if origin != get_domain_from_id(sender_user_id):
@@ -95,7 +99,7 @@ class DeviceMessageHandler:
         message_type: str,
         sender_user_id: str,
         by_device: Dict[str, Dict[str, Any]],
-    ):
+    ) -> None:
         """Checks inbound device messages for unknown remote devices, and if
         found marks the remote cache for the user as stale.
         """
@@ -138,11 +142,16 @@ class DeviceMessageHandler:
                 self._device_list_updater.user_device_resync, sender_user_id
             )
 
-    async def send_device_message(self, sender_user_id, message_type, messages):
+    async def send_device_message(
+        self,
+        sender_user_id: str,
+        message_type: str,
+        messages: Dict[str, Dict[str, JsonDict]],
+    ) -> None:
         set_tag("number_of_messages", len(messages))
         set_tag("sender", sender_user_id)
         local_messages = {}
-        remote_messages = {}
+        remote_messages = {}  # type: Dict[str, Dict[str, Dict[str, JsonDict]]]
         for user_id, by_device in messages.items():
             # we use UserID.from_string to catch invalid user ids
             if self.is_mine(UserID.from_string(user_id)):