Add function to error on any data messages from the peer

[nhooyr]

https://github.com/nhooyr/websocket/blob/31492255de53f0499a7255b5c4f45b345cb3ec7b/example_test.go#L77

@ammario suggested I add a function for that. I agree but I don't know what to name it.

[ammario]

CloseRead

[nhooyr]

That makes a lot of sense yup. Will add.

[nhooyr]

Nvm, if you call CloseRead, how will you cancel your context when the connection dies?

[nhooyr]

The function I'm thinking of is just

func SomeName(ctx) {
    c.Reader(ctx)
    c.Close(websocket.StatusPolicyViolation, "server doesn't accept data messages")
}

So you'd use it like

go func() {
    defer cancel()
    c.SomeName()
}()

[nhooyr]

I guess you could have:

func (c *Conn) CloseRead(ctx context.Context) (context.Context) {
    // spawn goroutine in example and return a context that will be cancelled when the goroutine returns
}

That seems reasonable. 🤔