Prefer using own client for fetching own profile

TODO.md

@@ -33,6 +33,7 @@
   - When qml syntax highlighting supports ES6 string interpolation, use that
 
 - Fixes
+  - CPU usage
   - `code` not colored in room subtitle
   - In the "Leave me" room, "join > Hi > left" aren't combined
   - Event delegates changing height don't scroll the list
@@ -146,6 +147,9 @@
     - Edit/delete own devices
     - Request room keys from own other devices
     - Auto-trust accounts within the same client
+    - Provide help when undecryptable messages occur, including:
+      - Trigger `nio.AsyncClient.request_room_key`
+      - Option to export-logout-login-import to fix one-time key problems
   - Read receipts
   - Status message and presence
 

src/python/backend.py

@@ -197,21 +197,23 @@ class Backend:
 
     # Client functions that don't need authentification
 
-    async def _any_client(self) -> MatrixClient:
+    async def _any_client(self, prefer: str = "") -> MatrixClient:
         while True:
-            try:
+            if self.clients:
-                return next(c for c in self.clients.values())
+                break
-            except StopIteration:
-                # Retry after a bit if we don't have any clients yet
             await asyncio.sleep(0.1)
 
+        return self.clients.get(prefer) or \
+               next(c for c in self.clients.values())
+
 
     async def get_profile(self, user_id: str) -> nio.ProfileGetResponse:
         if user_id in self.profile_cache:
             return self.profile_cache[user_id]
 
         async with self.get_profile_locks[user_id]:
-            response = await (await self._any_client()).get_profile(user_id)
+            client   = await self._any_client(prefer=user_id)
+            response = await client.get_profile(user_id)
 
             if isinstance(response, nio.ProfileGetError):
                 raise MatrixError.from_nio(response)

src/python/matrix_client.py

@@ -133,7 +133,10 @@ class MatrixClient(nio.AsyncClient):
 
     async def start(self) -> None:
         def on_profile_response(future) -> None:
-            if future.exception():
+            exception = future.exception()
+
+            if exception:
+                log.warn("On %s client startup: %s", self.user_id, exception)
                 return
 
             resp                    = future.result()