pass custom channel to websocket link

[yap-studios]

Hi,

Is there a way to receive and handle ping/pong messages from a server?

Rgards

[micimize]

what is a "ping/pong" message? If you mean subscription keep-alive messages, the websocket client should handle them for you

[yap-studios]

@micimize, when a server sends a websocket ping message I would like to receive the ping message and respond with a pong message.

I'm not interested in the keep-alive message since they are one-way.

[micimize]

Hmm – well, that sounds like you'd like to access the underlying websocket for some non-graphql implementation detail. That seems like a fair ask to me, but unfortunately the websocket is currently private.

[micimize]

If you use the v4 alpha, you can pass a channel to gql_websocket_link, which means you might be able to do what you want that way

[yap-studios]

Would you consider making the websocket publicly accessible? Are there any drawbacks? I'm working on a production app and would like to stick to a stable version if possible.

[micimize]

@yap-studios I think it should be, but it might be a minute before it gets done. In the meantime you can basically copy the websocket link and websocket client and make the vars public

[micimize]

4.0.0-alpha.6 now has an onConnectOrReconnect callback. Let me know if that solves the issue:
https://github.com/zino-app/graphql-flutter/blob/7192c1669c7dbecff0bbcd0665522c5b41207ab2/packages/graphql/lib/src/links/websocket_link/websocket_client.dart#L67-L70

[micimize]

I believe this is solved by the above in (#648),– please try with 4.0.0-beta.1 and comment if it is not satisfactory.

There is also even a way to override the connect function now:
https://github.com/zino-app/graphql-flutter/blob/d81011388be3787ea1221be7342b8c3fe25ffdd4/packages/graphql/lib/src/links/websocket_link/websocket_client.dart#L116

We can't really expose the raw socket as it is recreated on reconnects