Add a type hint for get_device_handler() and deal with the fallout.

changelog.d/14055.misc

@@ -0,0 +1 @@
+Add missing type hints to `HomeServer`.

synapse/handlers/deactivate_account.py

@@ -16,6 +16,7 @@
 from typing import TYPE_CHECKING, Optional
 
 from synapse.api.errors import SynapseError
+from synapse.handlers.device import DeviceHandler
 from synapse.metrics.background_process_metrics import run_as_background_process
 from synapse.types import Codes, Requester, UserID, create_requester
 
@@ -76,6 +77,9 @@ async def deactivate_account(
             True if identity server supports removing threepids, otherwise False.
         """
 
+        # This can only be called on the main process.
+        assert isinstance(self._device_handler, DeviceHandler)
+
         # Check if this user can be deactivated
         if not await self._third_party_rules.check_can_deactivate_user(
             user_id, by_admin

synapse/handlers/device.py

@@ -65,6 +65,8 @@
 
 
 class DeviceWorkerHandler:
+    device_list_updater: "DeviceListWorkerUpdater"
+
     def __init__(self, hs: "HomeServer"):
         self.clock = hs.get_clock()
         self.hs = hs
@@ -76,6 +78,8 @@ def __init__(self, hs: "HomeServer"):
         self.server_name = hs.hostname
         self._msc3852_enabled = hs.config.experimental.msc3852_enabled
 
+        self.device_list_updater = DeviceListWorkerUpdater(hs)
+
     @trace
     async def get_devices_by_user(self, user_id: str) -> List[JsonDict]:
         """
@@ -127,7 +131,7 @@ async def get_device(self, user_id: str, device_id: str) -> JsonDict:
     @cancellable
     async def get_device_changes_in_shared_rooms(
         self, user_id: str, room_ids: Collection[str], from_token: StreamToken
-    ) -> Collection[str]:
+    ) -> Set[str]:
         """Get the set of users whose devices have changed who share a room with
         the given user.
         """
@@ -320,6 +324,8 @@ async def handle_room_un_partial_stated(self, room_id: str) -> None:
 
 
 class DeviceHandler(DeviceWorkerHandler):
+    device_list_updater: "DeviceListUpdater"
+
     def __init__(self, hs: "HomeServer"):
         super().__init__(hs)
 
@@ -858,7 +864,36 @@ def _update_device_from_client_ips(
     )
 
 
-class DeviceListUpdater:
+class DeviceListWorkerUpdater:
+    "Handles incoming device list updates from federation and contacts the main process over replication"
+
+    def __init__(self, hs: "HomeServer"):
+        from synapse.replication.http.devices import (
+            ReplicationUserDevicesResyncRestServlet,
+        )
+
+        self._user_device_resync_client = (
+            ReplicationUserDevicesResyncRestServlet.make_client(hs)
+        )
+
+    async def user_device_resync(
+        self, user_id: str, mark_failed_as_stale: bool = True
+    ) -> Optional[JsonDict]:
+        """Fetches all devices for a user and updates the device cache with them.
+
+        Args:
+            user_id: The user's id whose device_list will be updated.
+            mark_failed_as_stale: Whether to mark the user's device list as stale
+                if the attempt to resync failed.
+        Returns:
+            A dict with device info as under the "devices" in the result of this
+            request:
+            https://matrix.org/docs/spec/server_server/r0.1.2#get-matrix-federation-v1-user-devices-userid
+        """
+        return await self._user_device_resync_client(user_id=user_id)
+
+
+class DeviceListUpdater(DeviceListWorkerUpdater):
     "Handles incoming device list updates from federation and updates the DB"
 
     def __init__(self, hs: "HomeServer", device_handler: DeviceHandler):

synapse/handlers/e2e_keys.py

@@ -27,9 +27,9 @@
 
 from synapse.api.constants import EduTypes
 from synapse.api.errors import CodeMessageException, Codes, NotFoundError, SynapseError
+from synapse.handlers.device import DeviceHandler
 from synapse.logging.context import make_deferred_yieldable, run_in_background
 from synapse.logging.opentracing import log_kv, set_tag, tag_args, trace
-from synapse.replication.http.devices import ReplicationUserDevicesResyncRestServlet
 from synapse.types import (
     JsonDict,
     UserID,
@@ -56,27 +56,23 @@ def __init__(self, hs: "HomeServer"):
         self.is_mine = hs.is_mine
         self.clock = hs.get_clock()
 
-        self._edu_updater = SigningKeyEduUpdater(hs, self)
-
         federation_registry = hs.get_federation_registry()
 
-        self._is_master = hs.config.worker.worker_app is None
-        if not self._is_master:
-            self._user_device_resync_client = (
-                ReplicationUserDevicesResyncRestServlet.make_client(hs)
-            )
-        else:
+        is_master = hs.config.worker.worker_app is None
+        if is_master:
+            edu_updater = SigningKeyEduUpdater(hs)
+
             # Only register this edu handler on master as it requires writing
             # device updates to the db
             federation_registry.register_edu_handler(
                 EduTypes.SIGNING_KEY_UPDATE,
-                self._edu_updater.incoming_signing_key_update,
+                edu_updater.incoming_signing_key_update,
             )
             # also handle the unstable version
             # FIXME: remove this when enough servers have upgraded
             federation_registry.register_edu_handler(
                 EduTypes.UNSTABLE_SIGNING_KEY_UPDATE,
-                self._edu_updater.incoming_signing_key_update,
+                edu_updater.incoming_signing_key_update,
             )
 
         # doesn't really work as part of the generic query API, because the
@@ -319,14 +315,13 @@ async def _query_devices_for_destination(
             # probably be tracking their device lists. However, we haven't
             # done an initial sync on the device list so we do it now.
             try:
-                if self._is_master:
-                    resync_results = await self.device_handler.device_list_updater.user_device_resync(
+                resync_results = (
+                    await self.device_handler.device_list_updater.user_device_resync(
                         user_id
                     )
-                else:
-                    resync_results = await self._user_device_resync_client(
-                        user_id=user_id
-                    )
+                )
+                if resync_results is None:
+                    raise ValueError("Device resync failed")
 
                 # Add the device keys to the results.
                 user_devices = resync_results["devices"]
@@ -605,6 +600,8 @@ async def claim_client_keys(destination: str) -> None:
     async def upload_keys_for_user(
         self, user_id: str, device_id: str, keys: JsonDict
     ) -> JsonDict:
+        # This can only be called from the main process.
+        assert isinstance(self.device_handler, DeviceHandler)
 
         time_now = self.clock.time_msec()
 
@@ -732,6 +729,8 @@ async def upload_signing_keys_for_user(
             user_id: the user uploading the keys
             keys: the signing keys
         """
+        # This can only be called from the main process.
+        assert isinstance(self.device_handler, DeviceHandler)
 
         # if a master key is uploaded, then check it.  Otherwise, load the
         # stored master key, to check signatures on other keys
@@ -823,6 +822,9 @@ async def upload_signatures_for_device_keys(
         Raises:
             SynapseError: if the signatures dict is not valid.
         """
+        # This can only be called from the main process.
+        assert isinstance(self.device_handler, DeviceHandler)
+
         failures = {}
 
         # signatures to be stored.  Each item will be a SignatureListItem
@@ -1200,6 +1202,9 @@ async def _retrieve_cross_signing_keys_for_remote_user(
             A tuple of the retrieved key content, the key's ID and the matching VerifyKey.
             If the key cannot be retrieved, all values in the tuple will instead be None.
         """
+        # This can only be called from the main process.
+        assert isinstance(self.device_handler, DeviceHandler)
+
         try:
             remote_result = await self.federation.query_user_devices(
                 user.domain, user.to_string()
@@ -1396,11 +1401,14 @@ class SignatureListItem:
 class SigningKeyEduUpdater:
     """Handles incoming signing key updates from federation and updates the DB"""
 
-    def __init__(self, hs: "HomeServer", e2e_keys_handler: E2eKeysHandler):
+    def __init__(self, hs: "HomeServer"):
         self.store = hs.get_datastores().main
         self.federation = hs.get_federation_client()
         self.clock = hs.get_clock()
-        self.e2e_keys_handler = e2e_keys_handler
+
+        device_handler = hs.get_device_handler()
+        assert isinstance(device_handler, DeviceHandler)
+        self._device_handler = device_handler
 
         self._remote_edu_linearizer = Linearizer(name="remote_signing_key")
 
@@ -1445,9 +1453,6 @@ async def _handle_signing_key_updates(self, user_id: str) -> None:
             user_id: the user whose updates we are processing
         """
 
-        device_handler = self.e2e_keys_handler.device_handler
-        device_list_updater = device_handler.device_list_updater
-
         async with self._remote_edu_linearizer.queue(user_id):
             pending_updates = self._pending_updates.pop(user_id, [])
             if not pending_updates:
@@ -1459,13 +1464,11 @@ async def _handle_signing_key_updates(self, user_id: str) -> None:
             logger.info("pending updates: %r", pending_updates)
 
             for master_key, self_signing_key in pending_updates:
-                new_device_ids = (
-                    await device_list_updater.process_cross_signing_key_update(
-                        user_id,
-                        master_key,
-                        self_signing_key,
-                    )
+                new_device_ids = await self._device_handler.device_list_updater.process_cross_signing_key_update(
+                    user_id,
+                    master_key,
+                    self_signing_key,
                 )
                 device_ids = device_ids + new_device_ids
 
-            await device_handler.notify_device_update(user_id, device_ids)
+            await self._device_handler.notify_device_update(user_id, device_ids)

synapse/handlers/register.py

@@ -38,6 +38,7 @@
 )
 from synapse.appservice import ApplicationService
 from synapse.config.server import is_threepid_reserved
+from synapse.handlers.device import DeviceHandler
 from synapse.http.servlet import assert_params_in_dict
 from synapse.replication.http.login import RegisterDeviceReplicationServlet
 from synapse.replication.http.register import (
@@ -841,6 +842,9 @@ class and RegisterDeviceReplicationServlet.
         refresh_token = None
         refresh_token_id = None
 
+        # This can only run on the main process.
+        assert isinstance(self.device_handler, DeviceHandler)
+
         registered_device_id = await self.device_handler.check_device_registered(
             user_id,
             device_id,

synapse/handlers/set_password.py

@@ -15,6 +15,7 @@
 from typing import TYPE_CHECKING, Optional
 
 from synapse.api.errors import Codes, StoreError, SynapseError
+from synapse.handlers.device import DeviceHandler
 from synapse.types import Requester
 
 if TYPE_CHECKING:
@@ -29,7 +30,10 @@ class SetPasswordHandler:
     def __init__(self, hs: "HomeServer"):
         self.store = hs.get_datastores().main
         self._auth_handler = hs.get_auth_handler()
-        self._device_handler = hs.get_device_handler()
+        # This can only be instantiated on the main process.
+        device_handler = hs.get_device_handler()
+        assert isinstance(device_handler, DeviceHandler)
+        self._device_handler = device_handler
 
     async def set_password(
         self,

synapse/handlers/sso.py

@@ -37,6 +37,7 @@
 from synapse.api.constants import LoginType
 from synapse.api.errors import Codes, NotFoundError, RedirectException, SynapseError
 from synapse.config.sso import SsoAttributeRequirement
+from synapse.handlers.device import DeviceHandler
 from synapse.handlers.register import init_counters_for_auth_provider
 from synapse.handlers.ui_auth import UIAuthSessionDataConstants
 from synapse.http import get_request_user_agent
@@ -1035,13 +1036,21 @@ async def revoke_sessions_for_provider_session_id(
     ) -> None:
         """Revoke any devices and in-flight logins tied to a provider session.
 
+        Can only be called from the main process.
+
         Args:
             auth_provider_id: A unique identifier for this SSO provider, e.g.
                 "oidc" or "saml".
             auth_provider_session_id: The session ID from the provider to logout
             expected_user_id: The user we're expecting to logout. If set, it will ignore
                 sessions belonging to other users and log an error.
         """
+
+        # It is expected that this is the main process.
+        assert isinstance(
+            self._device_handler, DeviceHandler
+        ), "revoking SSO sessions can only be called on the main process"
+
         # Invalidate any running user-mapping sessions
         to_delete = []
         for session_id, session in self._username_mapping_sessions.items():

synapse/module_api/__init__.py

@@ -86,6 +86,7 @@
     ON_LOGGED_OUT_CALLBACK,
     AuthHandler,
 )
+from synapse.handlers.device import DeviceHandler
 from synapse.handlers.push_rules import RuleSpec, check_actions
 from synapse.http.client import SimpleHttpClient
 from synapse.http.server import (
@@ -207,6 +208,7 @@ def __init__(self, hs: "HomeServer", auth_handler: AuthHandler) -> None:
         self._registration_handler = hs.get_registration_handler()
         self._send_email_handler = hs.get_send_email_handler()
         self._push_rules_handler = hs.get_push_rules_handler()
+        self._device_handler = hs.get_device_handler()
         self.custom_template_dir = hs.config.server.custom_template_directory
 
         try:
@@ -784,6 +786,8 @@ def invalidate_access_token(
     ) -> Generator["defer.Deferred[Any]", Any, None]:
         """Invalidate an access token for a user
 
+        Can only be called from the main process.
+
         Added in Synapse v0.25.0.
 
         Args:
@@ -796,6 +800,10 @@ def invalidate_access_token(
         Raises:
             synapse.api.errors.AuthError: the access token is invalid
         """
+        assert isinstance(
+            self._device_handler, DeviceHandler
+        ), "invalidate_access_token can only be called on the main process"
+
         # see if the access token corresponds to a device
         user_info = yield defer.ensureDeferred(
             self._auth.get_user_by_access_token(access_token)
@@ -805,7 +813,7 @@ def invalidate_access_token(
         if device_id:
             # delete the device, which will also delete its access tokens
             yield defer.ensureDeferred(
-                self._hs.get_device_handler().delete_devices(user_id, [device_id])
+                self._device_handler.delete_devices(user_id, [device_id])
             )
         else:
             # no associated device. Just delete the access token.

synapse/replication/http/devices.py

@@ -13,7 +13,7 @@
 # limitations under the License.
 
 import logging
-from typing import TYPE_CHECKING, Tuple
+from typing import TYPE_CHECKING, Optional, Tuple
 
 from twisted.web.server import Request
 
@@ -63,7 +63,12 @@ class ReplicationUserDevicesResyncRestServlet(ReplicationEndpoint):
     def __init__(self, hs: "HomeServer"):
         super().__init__(hs)
 
-        self.device_list_updater = hs.get_device_handler().device_list_updater
+        from synapse.handlers.device import DeviceHandler
+
+        handler = hs.get_device_handler()
+        assert isinstance(handler, DeviceHandler)
+        self.device_list_updater = handler.device_list_updater
+
         self.store = hs.get_datastores().main
         self.clock = hs.get_clock()
 
@@ -73,7 +78,7 @@ async def _serialize_payload(user_id: str) -> JsonDict:  # type: ignore[override
 
     async def _handle_request(  # type: ignore[override]
         self, request: Request, user_id: str
-    ) -> Tuple[int, JsonDict]:
+    ) -> Tuple[int, Optional[JsonDict]]:
         user_devices = await self.device_list_updater.user_device_resync(user_id)
 
         return 200, user_devices