server: graceful shutdown check Incoming::Closed
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niklasad1
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| match receiver.receive(&mut data).await { | ||
| Ok(Incoming::Closed(_)) | Err(SokettoError::Closed) => None, | ||
| Ok(Incoming::Data(_) | Incoming::Pong(_)) => Some(((), (receiver, data))), | ||
| Err(e) => { |
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Just to check; do you no longer need to return None when Err(SokettoError::Closed) is a thing now?
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All errors except Closed are ignored here because we can't really know whether when it's closed or not otherwise.
We will keep the stream alive until either SokettoError::Closed or Incoming::Closed is returned back because some implementations may not do the proper WebSocket close handshake message such as the soketto client #871. Thus, we need to check both
However, soketto will eventually return SokettError::Closed after this https://github.com/paritytech/soketto/blob/master/src/connection.rs#L386-L388 so this extra check in this PR shouldn't matter in "practice" but we need to call receive one more time instead then also I like us to be explicit here which makes it easier to understand.
FWIW, it may also be a bunch of I/O errors that could terminate the connection as well but those are super-tricky to detect so we are relying on the close stuff... and that soketto regards EOF errors as Closed
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Oohh I actually missed that you were still paying attention to SokettoError::Closed anyway, so yup all makes sense to me now; thanks for the explanation! :)
* server: graceful shutdown check `Incoming::Closed` * Update server/src/transport/ws.rs
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