watchdog as possible fix winerror 64

proxy/tg_ws_proxy.py

@@ -35,6 +35,8 @@ log = logging.getLogger('tg-mtproto-proxy')
 
 DC_FAIL_COOLDOWN = 30.0
 WS_FAIL_TIMEOUT = 2.0
+LISTENER_CHECK_INTERVAL = 5.0
+LISTENER_RESTART_DELAY = 0.5
 ws_blacklist: Set[str] = set()
 dc_fail_until: Dict[str, float] = {}
 
@@ -511,43 +513,84 @@ async def _run(stop_event: Optional[asyncio.Event] = None):
     await ws_pool.warmup()
     await cf_worker_pool.warmup()
 
+    async def _quiet_cancel(t):
+        if not t.done():
+            t.cancel()
+        try:
+            await t
+        except (asyncio.CancelledError, Exception):
+            pass
+
     try:
-        async with server:
-            if stop_event:
-                serve_task = asyncio.create_task(server.serve_forever())
-                stop_task = asyncio.create_task(stop_event.wait())
-                done, _ = await asyncio.wait(
-                    (serve_task, stop_task),
-                    return_when=asyncio.FIRST_COMPLETED,
-                )
-                if stop_task in done:
-                    for task in list(_client_tasks):
-                        task.cancel()
-                    if _client_tasks:
-                        await asyncio.gather(
-                            *_client_tasks, return_exceptions=True)
-                    if not serve_task.done():
-                        serve_task.cancel()
-                        try:
-                            await serve_task
-                        except asyncio.CancelledError:
-                            pass
-                    server.close()
-                    await server.wait_closed()
-                else:
-                    stop_task.cancel()
-                    try:
-                        await stop_task
-                    except asyncio.CancelledError:
-                        pass
-            else:
-                await server.serve_forever()
+        while True:
+            serve_task = asyncio.create_task(server.serve_forever())
+            stop_task = (asyncio.create_task(stop_event.wait())
+                         if stop_event else None)
+
+            async def _listener_watchdog():
+                while True:
+                    await asyncio.sleep(LISTENER_CHECK_INTERVAL)
+                    socks = server.sockets
+                    if not socks or all(s.fileno() < 0 for s in socks):
+                        return
+
+            watchdog_task = asyncio.create_task(_listener_watchdog())
+            waiters = [serve_task, watchdog_task]
+            if stop_task is not None:
+                waiters.append(stop_task)
+
+            done, _ = await asyncio.wait(
+                waiters, return_when=asyncio.FIRST_COMPLETED)
+
+            if stop_task is not None and stop_task in done:
+                for task in list(_client_tasks):
+                    task.cancel()
+                if _client_tasks:
+                    await asyncio.gather(
+                        *_client_tasks, return_exceptions=True)
+                await _quiet_cancel(watchdog_task)
+                await _quiet_cancel(serve_task)
+                server.close()
+                await server.wait_closed()
+                break
+
+            await _quiet_cancel(watchdog_task)
+            await _quiet_cancel(serve_task)
+            log.warning(
+                "Listening socket died (OS accept error, e.g. WinError 64); "
+                "restarting server")
+            server.close()
+            try:
+                await server.wait_closed()
+            except Exception:
+                pass
+            await asyncio.sleep(LISTENER_RESTART_DELAY)
+            try:
+                server = await asyncio.start_server(
+                    client_cb, proxy_config.host, proxy_config.port)
+            except OSError as exc:
+                log.error("Failed to restart server: %s", repr(exc))
+                break
+            _server_instance = server
+            for sock in server.sockets:
+                try:
+                    sock.setsockopt(
+                        _socket.IPPROTO_TCP, _socket.TCP_NODELAY, 1)
+                except (OSError, AttributeError):
+                    pass
+            log.warning("Server restored, listening on %s:%d",
+                        proxy_config.host, proxy_config.port)
     finally:
         log_stats_task.cancel()
         try:
             await log_stats_task
         except asyncio.CancelledError:
             pass
+        try:
+            server.close()
+            await server.wait_closed()
+        except Exception:
+            pass
     _server_instance = None