feat(deltachat-rpc-client): log exceptions when long-running tasks die

For example, reader_loop() may die
if readline() tries to read too large line
and thows an exception.
We want to at least log the exception in this case.

deltachat-rpc-client/src/deltachat_rpc_client/rpc.py

@@ -1,5 +1,6 @@
 import asyncio
 import json
+import logging
 import os
 from typing import Any, Dict, Optional
 
@@ -57,16 +58,20 @@ class Rpc:
         await self.close()
 
     async def reader_loop(self) -> None:
-        while True:
-            line = await self.process.stdout.readline()  # noqa
-            if not line:  # EOF
-                break
-            response = json.loads(line)
-            if "id" in response:
-                fut = self.request_events.pop(response["id"])
-                fut.set_result(response)
-            else:
-                print(response)
+        try:
+            while True:
+                line = await self.process.stdout.readline()  # noqa
+                if not line:  # EOF
+                    break
+                response = json.loads(line)
+                if "id" in response:
+                    fut = self.request_events.pop(response["id"])
+                    fut.set_result(response)
+                else:
+                    print(response)
+        except Exception:
+            # Log an exception if the reader loop dies.
+            logging.exception("Exception in the reader loop")
 
     async def get_queue(self, account_id: int) -> asyncio.Queue:
         if account_id not in self.event_queues:
@@ -75,13 +80,17 @@ class Rpc:
 
     async def events_loop(self) -> None:
         """Requests new events and distributes them between queues."""
-        while True:
-            if self.closing:
-                return
-            event = await self.get_next_event()
-            account_id = event["contextId"]
-            queue = await self.get_queue(account_id)
-            await queue.put(event["event"])
+        try:
+            while True:
+                if self.closing:
+                    return
+                event = await self.get_next_event()
+                account_id = event["contextId"]
+                queue = await self.get_queue(account_id)
+                await queue.put(event["event"])
+        except Exception:
+            # Log an exception if the event loop dies.
+            logging.exception("Exception in the event loop")
 
     async def wait_for_event(self, account_id: int) -> Optional[dict]:
         """Waits for the next event from the given account and returns it."""