listener: Ensure tcp/websocket do not terminate on listener errors #439
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Signed-off-by: Alexandru Vasile <[email protected]>
Signed-off-by: Alexandru Vasile <[email protected]>
Signed-off-by: Alexandru Vasile <[email protected]>
Signed-off-by: Alexandru Vasile <[email protected]>
| return Poll::Ready(Some(Ok((stream, address)))); | ||
| } | ||
| Poll::Ready(Err(error)) => match error.kind() { | ||
| ErrorKind::ConnectionAborted | ErrorKind::ConnectionReset => { |
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I would double check that socket.accept() can't generate these errors continuously after a socket error — otherwise we would end up busy-looping here.
| ?error, | ||
| "Fatal error for listener", | ||
| ); | ||
| self.listeners[current] = None; |
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IMO a better way would be to terminate the process and let the restarted process listen again, than stopping accepting incoming connections completely.
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This PR ensures that both TCP and WebSocket transports do not terminate in case of listener errors.
Recoverable errors like
ConnectionAborted(which signals that the client connection entered the queue and disconnected before we got a chance to process it) are retried.Nonrecoverable errors lead to the
TokioListenerbeing dropped and never polled again (ie, removed from the transport service).TCP and Websocket are now robust wrt listener errors and will not terminate the main execution loop unless the listeners return None.
Closes: #437
cc @paritytech/networking