radiodiodio/icecast/icecast.go

package icecast

import (
	"fmt"
	"encoding/base64"
	"net"
	"net/http"
	"net/url"
	"bufio"
	"strings"
	"time"
	"errors"
	"strconv"
	"io/ioutil"
	"../config"
	"../socket"
)

var connected bool = false
var stream_socket net.Conn
var status int = 0
var server_msg string

var pln = fmt.Println
var spf = fmt.Sprintf


func Connect() (net.Conn, error){

	if connected {
		return stream_socket, nil
	}

	var sock net.Conn
	host := config.Xcfg.Server.ADDR + ":" + strconv.Itoa(config.Xcfg.Server.PORT)
	sock, err := net.Dial("tcp", host)

	if err != nil {
		connected = false
		return sock, err
	}

	time.Sleep(time.Second)

	// doing connection BUTT style (i.e. multiple sends)
	// icecast only for now
	// try PUT method

	mount := config.Xcfg.Server.MOUNT
	s := spf("PUT %s HTTP/1.1\r\n", mount)
	if mount[0] != '/' {
		s = spf("PUT /%s HTTP/1.1\r\n", mount)
	}
	err = socket.Send(sock, []byte(s))

	s = spf("%s:%s", config.Xcfg.Server.USR, config.Xcfg.Server.PWD)
	sb64 := "Authorization: Basic " + base64.StdEncoding.EncodeToString([]byte(s)) + "\r\n"
	err = socket.Send(sock, []byte(sb64))

	s = "User-Agent: radiodiodio/v0.0\r\n"
	err = socket.Send(sock, []byte(s))	
	
	s = "Content-Type: audio/mp3\r\n"
	err = socket.Send(sock, []byte(s))	

	s = spf("ice-name: %s\r\n", config.Xcfg.Ice.NAME)
	err = socket.Send(sock, []byte(s))

	s = spf("ice-public: %s\r\n", config.Xcfg.Ice.PUB)
	err = socket.Send(sock, []byte(s))

	s = spf("ice-url: %s\r\n", config.Xcfg.Ice.URL)
	err = socket.Send(sock, []byte(s))

	s = spf("ice-genre: %s\r\n", config.Xcfg.Ice.GENRE)
	err = socket.Send(sock, []byte(s))

	s = spf("ice-description: %s\r\n", config.Xcfg.Ice.DESC)
	err = socket.Send(sock, []byte(s))

	s = "ice-audio-info: ice-bitrate=192000; ice-channels=2; ice-samplerate=44100\r\n"
	err = socket.Send(sock, []byte(s))

	s = "\r\n"
	err = socket.Send(sock, []byte(s))

	if err != nil {
		pln("error: sending PUT to the icecast server")
		connected = false
		return sock, err
	}

	time.Sleep(time.Second)

	resp, err := socket.Recv(sock)
	if err != nil {
		pln("error: receiving response from the icecast server")
		connected = false
		return sock, err
	}

	status, server_msg, err := read_http_response(resp)

	if status != 200 {
		connected = false
		return sock, errors.New("Icecast connection failed: " + strconv.Itoa(status) + " - " + server_msg)		
	}
	
	pln("YAYAY!!")

	connected = true
	stream_socket = sock

	return sock, nil

}

func Disconnect() {
	stream_socket.Close()
	connected = false
}

func Send(buff []byte) error {
	if !connected {
		return errors.New("Not connected to Icecast server")
	}
	err := socket.Send(stream_socket, buff)
	return err
}

func Update() error {

	host := config.Xcfg.Server.ADDR + ":" + strconv.Itoa(config.Xcfg.Server.PORT)	
	track := url.QueryEscape(config.Xcfg.Track.NAME)
	mount := config.Xcfg.Server.MOUNT
	if mount[0] != '/' {
		mount = "/" + mount
	}	

	s := spf("%s:%s", config.Xcfg.Server.USR, config.Xcfg.Server.PWD)
	sb64 := "Basic " + base64.StdEncoding.EncodeToString([]byte(s))

	header := 	"GET /admin/metadata?mode=updinfo&mount=" + mount + "&song=" + track + " HTTP/1.0\r\n" +
				"User-Agent: radiodiodio/v0.0\r\n" + 
				"Authorization: " + sb64 + "\r\n" +
				"\r\n"

	pln(host)
	pln(header)

	var sock net.Conn
	sock, err := net.Dial("tcp", host)
	if err != nil {
		return err
	}

	time.Sleep(time.Second)

	err = socket.Send(sock, []byte(header))

	time.Sleep(time.Second)

	defer sock.Close()

	resp, err := socket.Recv(sock)
	if err != nil {
		pln("error: receiving response from the icecast server")
		connected = false
		return err
	}

	status, server_msg, err := read_http_response(resp)

	if status != 200 {
		connected = false
		return errors.New("Icecast connection failed: " + strconv.Itoa(status) + " - " + server_msg)		
	} else {
		pln(server_msg)
	}

	return err

}


func read_http_response(raw_resp []byte) (int, string, error) {

	reader := bufio.NewReader(strings.NewReader(string(raw_resp)))
	resp, err := http.ReadResponse(reader, nil)
	if err != nil {
		return 0, "", err
	}

	status := resp.StatusCode

	defer resp.Body.Close()
	body, er := ioutil.ReadAll(resp.Body)
	if er != nil {
		return status, "", er
	}

	return status, string(body), nil

}