Share: go-vhost a library for name based virtual hosting

[Alan Shreve]

Code: https://github.com/inconshreveable/go-vhost

It's a library that lets you implement custom name-based virtual-host like behavior for protocols that support it. You give it a connection and a protocol and it returns to you the hostname and a new connection object that works as if nothing had been read from the original connection.

An illustrative example:

conn, _ := l.Accept()

// reads out the ClientHello message and parses the hostname out of the SNI extension

newConn, err := vhost.TLS(conn)

// take different behaviors based on the hostname

switch newConn.Host() {

}

The intended audience is small, just people implementing their own servers/proxies. I needed it for more than one of my projects though so I split it out into a library in case anyone else could benefit.

Currently only HTTP and TLS are supported.

[Alan Shreve]

For anyone following this project, I've added a new higher-level interface for muxing connections which makes this library far easier to use. The high-level interface lets you wrap existing net.Listeners with "muxer" objects. You can then Listen() on a muxer for a particular virtual host name of interest which will return to you a net.Listener which only accepts connections with the given virtual host name.

Example code for an HTTP multiplexer:

   import vhost "github.com/inconshreveable/go-vhost"

    // listen for connections on a port

    l, _ := net.Listen(":80")

    // start multiplexing on it

    mux, _ := vhost.NewHTTPMuxer(l, muxTimeout)

    // use the default error handler

    go mux.HandleErrors()

    // listen for connections to different domains

    for _, v := range virtualHosts {

            vhost := v

            // vhost.Name is a virtual hostname like "foo.example.com"

            muxListener, _ := mux.Listen(vhost.Name)

            go func() {

                    for {

                            conn, _ := muxListener.Accept()

                            go vhost.Handle(conn)

                    }

            }()

    }

Code and docs: 

https://github.com/inconshreveable/go-vhost

https://godoc.org/github.com/inconshreveable/go-vhost

---

From: al...@inconshreveable.com
To: golan...@googlegroups.com
Subject: [go-nuts] Share: go-vhost a library for name based virtual hosting
Date: Sat, 9 Nov 2013 12:10:34 +0000

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