Migrate off github.com/gorilla/websocket

[guseggert]

The github.com/gorilla/websocket module, used for WebSocket support by go-libp2p, was recently archived and is no longer maintained.

The only other serious option I can find is https://github.com/nhooyr/websocket, but it does not support HTTP/2. There is also an attempt to fork the Gorilla repos here: https://github.com/gorillaincubator. Or go-libp2p could maintain its own fork.

[marten-seemann]

Thank you for opening this issue @guseggert. This is annoying, but I can't really say that this comes as a surprise.

Or go-libp2p could maintain its own fork.

Given our recent experience with maintaining our own forks of libraries, I'd really really like to avoid that.

The only other serious option I can find is https://github.com/nhooyr/websocket, but it does not support HTTP/2.

To be honest, I don't think we need to care a lot about HTTP/2. Our use is having a single WebSocket connection on top of one TCP connection, so we don't really benefit from HTTP/2's stream multiplexing. Given that we're only doing a single WebSocket Upgrade request, the savings due to HPACK should be minimal as well.

There's also https://pkg.go.dev/golang.org/x/net/websocket, but it claims to lack some features of Gorilla and nhooyr (without specifying which 🙄). From a cursory glance at the godoc, Dial doesn't take context.Context (and there's no DialContext or similar), which suggests that it's not well maintained.
UPDATE: Yes, looks like it's deprecated: golang/go#18152.

[guseggert]

I also found this, I haven't done a deep dive so I don't know how appropriate it is: https://github.com/lesismal/nbio