New Case Study:See how Anthropic automated 95% of dependency reviews with Socket.Learn More
Socket
Sign inDemoInstall
Socket

github.com/cockroachdb/cmux

Package Overview
Dependencies
Alerts
File Explorer
Socket logo

Install Socket

Detect and block malicious and high-risk dependencies

Install

github.com/cockroachdb/cmux

v0.0.0-20170110192607-30d10be49292
Source
Go
Version published
Created
Source

cmux: Connection Mux Build Status GoDoc

cmux is a generic Go library to multiplex connections based on their payload. Using cmux, you can serve gRPC, SSH, HTTPS, HTTP, Go RPC, and pretty much any other protocol on the same TCP listener.

How-To

Simply create your main listener, create a cmux for that listener, and then match connections:

// 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:
// First grpc, then HTTP, and otherwise Go RPC/TCP.
grpcL := m.Match(cmux.HTTP2HeaderField("content-type", "application/grpc"))
httpL := m.Match(cmux.HTTP1Fast())
trpcL := 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{},
}

trpcS := rpc.NewServer()
s.Register(&ExampleRPCRcvr{})

// Use the muxed listeners for your servers.
go grpcS.Serve(grpcL)
go httpS.Serve(httpL)
go trpcS.Accept(trpcL)

// Start serving!
m.Serve()

There are more examples on GoDoc.

Performance

Since we are only matching the very first bytes of a connection, the performance overhead on long-lived connections (i.e., RPCs and pipelined HTTP streams) is negligible.

Limitations

  • TLS: net/http uses a type assertion to identify TLS connections; since cmux's lookahead-implementing connection wraps the underlying TLS connection, this type assertion fails. This means you can serve HTTPS using cmux but http.Request.TLS will not be set in your handlers. If you are able to wrap TLS around cmux, you can work around this limitation. See https://github.com/cockroachdb/cockroach/commit/83caba2 for an example of this approach.

  • 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.

Copyright 2016 The CMux Authors. All rights reserved.

See CONTRIBUTORS for the CMux Authors. Code is released under the Apache 2 license.

FAQs

Package last updated on 10 Jan 2017

Did you know?

Socket

Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.

Install

Related posts