How do I send websocket message from the client?

[dulguun0225]

Hello. I'm migrating a existing project to graphql-ws. There's a code that sends websocket message from the client like

    wsLink.subscriptionClient.sendMessage({
      type: 'messengerConnected',
      value: messengerData
    });

I want to send a websocket message from the client just like the previous code. How do I do that?

[enisdenjo]

You cannot. graphql-ws is in control over the message transport. You can only subscribe.

Even if you could send a custom message (like the one from your example), a GraphQL over WebSocket compliant server would terminate the connection immediately since invalid messages are considered fatal.

[dulguun0225]

Well, then, I'm in a pickle now. Any advice would be greatly appreciated.

Basically what I'm trying to do is,

1. Send some data from client to server
2. Attach that information to the corresponding server subscription socket.
3. Use that information on subscription's onClose event.

[enisdenjo]

As already mentioned, any message you send that's not a part of the GraphQL over WebSocket protocol is considered invalid and therefore fatal.

You can instead use the client's connectionParams, which are a part of the ConnectionInit message, to transmit additional data about the connection.

[dulguun0225]

Thank you!