mirror of
https://github.com/soheilhy/cmux.git
synced 2024-11-10 03:31:52 +08:00
64 lines
2.0 KiB
Markdown
64 lines
2.0 KiB
Markdown
# cmux: Connection Mux  [](http://godoc.org/github.com/soheilhy/cmux)
|
|
|
|
cmux is a generic Go library to multiplex connections based on
|
|
their payload. Using cmux, you can serve gRPC, HTTP, and Go RPC
|
|
on the same TCP listener to avoid using one port per
|
|
protocol.
|
|
|
|
## How-To
|
|
Simply create your main listener, create a cmux for that listener,
|
|
and then match connections:
|
|
```go
|
|
// Create the main listener.
|
|
l, err := net.Listen("tcp", ":23456")
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
|
|
// Create a cmux.
|
|
m := cmux.New(l)
|
|
|
|
// Match connections in order.
|
|
grpcL := m.Match(cmux.HTTP2HeaderField("content-type", "application/grpc"))
|
|
httpL := m.Match(cmux.Any()) // Any means anything that is not yet matched.
|
|
|
|
// Create your protocol servers.
|
|
grpcS := grpc.NewServer()
|
|
grpchello.RegisterGreeterServer(grpcs, &server{})
|
|
|
|
httpS := &http.Server{
|
|
Handler: &helloHTTP1Handler{},
|
|
}
|
|
|
|
// Use the muxed listeners for your servers.
|
|
go grpcS.Serve(grpcL)
|
|
go httpS.Serve(httpL)
|
|
|
|
// Start serving!
|
|
m.Serve()
|
|
```
|
|
|
|
Take a look at [other examples in the GoDoc](http://godoc.org/github.com/soheilhy/cmux/#pkg-examples).
|
|
|
|
## Docs
|
|
* [GoDocs](https://godoc.org/github.com/soheilhy/cmux)
|
|
|
|
## Performance
|
|
There is room for improvment but, since we are only matching
|
|
the very first bytes of a connection, the performance overheads on
|
|
long-lived connections (i.e., RPCs and pipelined HTTP streams)
|
|
is negligible.
|
|
|
|
*TODO(soheil)*: Add benchmarks.
|
|
|
|
## Limitations
|
|
* *TLS*: Since `cmux` sits in between the actual listener and the mux'ed
|
|
listeners, TLS handshake is not handled inside the actual servers.
|
|
Because of that, you can serve HTTPS using cmux but `http.Request.TLS`
|
|
would not be set in your handlers.
|
|
|
|
* *Different Protocols on The Same Connection*: `cmux` matches the connection
|
|
when it's accepted. For example, one connection can be either gRPC or REST, but
|
|
not both. That is, we assume that a client connection is either used for gRPC
|
|
or REST.
|