socket

Go package to parse socket names described in Nginx convention.

Sets the address and port for IP, or the path for a UNIX-domain socket on which the server will accept requests. Both address and port, or only address or only port can be specified. An address may also be a hostname, for example:

socket.Parse("127.0.0.1:8000") // "tcp", "127.0.0.1:8000"
socket.Parse("127.0.0.1") // "tcp", "127.0.0.1:80
socket.Parse("8000") // "tcp", ":8000"
socket.Parse("*:8000") // "tcp", ":8000"
socket.Parse("localhost:8000") // "tcp", "localhost:8000"

IPv6 addresses are specified in square brackets:

socket.Parse("[::]:8000") // "tcp", "[::]:8000"
socket.Parse("[::1]") // "tcp", "[::1]:80"

UNIX-domain sockets are specified with the “unix:” prefix:

socket.Parse("unix:/var/run/nginx.sock") // "unix", "/var/run/nginx.sock"

If only address is given, the port 80 is used.

socket.Parse("localhost") // "tcp", "localhost:80"

Installation and usage

go get github.com/oftn-oswg/socket

package main

import (
	"fmt"
	"io"
	"os"
	"strconv"

	"github.com/oftn-oswg/socket"
)

// This is a simple echo server which creates a socket
// based on the arguments provided to the command. The socket can be
// described with a syntax that nginx, the web server, accepts for its listen directive.
func main() {
	if len(os.Args) < 2 {
		fmt.Fprintf(os.Stderr, "Usage: %s <socket> [<mode>]\n", os.Args[0])
		os.Exit(1)
	}

	mode := os.FileMode(0660)
	if len(os.Args) >= 3 {
		num, err := strconv.ParseInt(os.Args[2], 0, 0)
		if err != nil {
			fmt.Fprintf(os.Stderr, "Error parsing file mode: %s\n", err)
			os.Exit(1)
		}
		mode = os.FileMode(num)
	}

	network, address := socket.Parse(os.Args[1])
	listener, err := socket.Listen(network, address, mode)
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error creating socket: %s\n", err)
		os.Exit(1)
	}

	for {
		conn, err := listener.Accept()
		if err != nil {
			fmt.Fprintln(os.Stderr, err)
			continue
		}

		go func() {
			defer conn.Close()
			_, err := io.Copy(conn, conn)
			if err != nil {
				fmt.Fprintln(os.Stderr, err)
			}
		}()
	}
}