orestesgaolin
commented
1 year ago I was trying to reproduce the problem on the starwars example app, but it works just fine with that:
- Start the example starwars server locally and run the example starwars app on Android emulator
- Turn airplane mode on the emulator
- Websocket gets disconnected
- You can see
I/flutter ( 5978): There was an error causing connection lost: SocketException: Connection failed (OS Error: Network is unreachable, errno = 101), address = 10.0.2.2, port = 3000 - But after turning on the internet the connection restores with
I/flutter ( 5978): Initialising connection
In case of my CustomWsLink I was able to capture the exception in onStreamError of SocketClient and reconnect as follows. When the WebSocketChannelException is thrown, the onStreamError is called and this is how I can react to this by repeatedly trying to reconnect. It's a proof of concept, but for now it seems to work better than without it.
void _connectOrReconnect(String token) {
_connection?.client.dispose();
_connection = _Connection(
client: SocketClient(
url,
// the default implementation does nothing with the exception
onStreamError: (error, stackTrace) {
Logger(tag: 'CustomWsLink').e('Socket error:', error, stackTrace);
Future<void>.delayed(const Duration(milliseconds: 1500))
.then((value) {
_connectOrReconnect(token);
});
},
config: SocketClientConfig(
autoReconnect: true,
inactivityTimeout: const Duration(seconds: 30),
queryAndMutationTimeout: const Duration(seconds: 10),
delayBetweenReconnectionAttempts: const Duration(seconds: 5),
connectFn: (uri, protocols) async {
await getToken();
var channel = WebSocketChannel.connect(uri, protocols: protocols);
// ignore: join_return_with_assignment
channel = channel.forGraphQLIsolate();
return channel;
},
initialPayload: () async {
return {
'headers': {
'Authorization': await getToken(),
'X-Hasura-User-Id': userUid,
'X-Hasura-Role': 'user',
'Content-Type': 'application/json',
},
};
},
),
),
token: token,
);
}
vincenzopalazzo
GoncaloPT
Describe the issue Connection drops with the exception
WebSocketChannelExceptionand cannot be restored without restarting the app. The problem occurs more or less regularly when the app is idle for at least 20-30 minutes e.g. in the background.To Reproduce
I couldn't find an easy way to reproduce it, but I will try with the example app.
I'm using custom
WebSocketLinkthat usescomputeto parse messages and maybe I'm missing something that was already fixed?Expected behavior
The websocket eventually reconnects
device / execution context Happens both on iOS and Android
Other useful/optional fields
Stacktrace:
```dart #0 new IOWebSocketChannel._withoutSocket.Logs:
``` I/flutter (31184): Disconnected from websocket. [log] [DataClient] [38;5;12m💡 Token expires at 2022-11-02 17:55:33.000 I/flutter (31184): Initialising connection [log] [DataClient] [38;5;12m💡 Token expires at 2022-11-02 17:55:33.000 I/flutter (31184): [SocketClient] message stream encountered error: WebSocketChannelException: WebSocketChannelException: HttpException: Connection reset by peer, uri = https://redacted.hasura.app:0/v1/graphql I/flutter (31184): stacktrace: I/flutter (31184): #0 new IOWebSocketChannel._withoutSocket.additional context
Dependencies:
Flutter doctor