// the find
zishang520/socket.io
Socket.IO for Go — A high-performance, feature-complete implementation supporting Socket.IO v4+. Start your real-time journey today! 🚀
A Go port of the Socket.IO v4 server and client, structured as a monorepo with separate modules for engine, socket, parsers, and adapters (Redis, Postgres, MongoDB, Valkey, Unix sockets). Aimed at Go shops that need to interoperate with existing Socket.IO JS clients without running a Node process. 534 stars suggests real-world use but it's not a household name.
Protocol fidelity is the main sell — it tracks Socket.IO v4 including binary payloads, namespaces, and rooms, which most Go WebSocket libraries don't even attempt. The adapter story is genuinely good: Redis, Postgres LISTEN/NOTIFY, Valkey, MongoDB, and Unix sockets all ship as first-class modules, so horizontal scaling isn't an afterthought. The monorepo structure keeps engine.io and socket.io separated at the same layer boundary as the JS reference implementation, which means protocol bugs are easier to isolate. Test coverage is thorough — stress tests, extended tests, and benchmark files are present across the pkg layer.
Documentation is thin — there's a docs/ folder with one upgrade guide and a pointer to README examples; no API reference, no runbook for common patterns like auth middleware or custom parsers. The Go API surface is non-idiomatic in places: the event emitter pattern mirrors the JS EventEmitter closely, which means callback-heavy code instead of channels where Go developers would expect them. WebTransport support is present in the directory tree but the implementation looks incomplete and untested against a real HTTP/3 stack. At 534 stars and a single primary author, bus-factor is real — if the upstream JS protocol moves fast (it has before), it's unclear how quickly this tracks.