/
main.go
363 lines (309 loc) · 6.97 KB
/
main.go
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package main
import (
"bytes"
"encoding/json"
"flag"
"fmt"
"html/template"
"io/ioutil"
"log"
"net"
"net/http"
"net/url"
"os"
"path/filepath"
"strings"
"sync"
"time"
"github.com/gorilla/websocket" // Websockets
)
var (
debug = flag.Bool("debug", false, "Debug flag")
upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
}
)
// Error wrapper
func errorHandler(f func(w http.ResponseWriter, r *http.Request) error) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if err := f(w, r); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
log.Println("error handling %q: %v", r.RequestURI, err)
}
}
}
// Single file serving
func (s *Server) sServe(pattern string, filename string) {
http.HandleFunc(pattern, func(w http.ResponseWriter, r *http.Request) {
http.ServeFile(w, r, filename)
})
}
type Song struct {
Name string
Score int
}
type State struct {
Address string
Songs []Song
Playing string
}
type Message struct {
Command string
Song Song
Time int
}
type Server struct {
songLock *sync.Mutex
songMap map[string]int
songList []Song
songPlaying *Message
sockLock *sync.Mutex
sockUsers []*websocket.Conn
addrs string
tmpl *template.Template
}
func (s *Server) plus(song Song) {
s.songUpdate(song, +1)
}
func (s *Server) minus(song Song) {
s.songUpdate(song, -1)
}
func (s *Server) songUpdate(song Song, i int) {
s.songLock.Lock()
defer s.songLock.Unlock()
s.songMap[song.Name] = s.songMap[song.Name] + i
song.Score = s.songMap[song.Name]
msg := &Message{
Command: "update",
Song: song,
}
log.Println(s.sockUsers)
s.sockWriteLoop(msg)
}
func makeTimestamp() int64 {
return time.Now().UnixNano() / int64(time.Millisecond)
}
func (s *Server) next(song Song) {
s.songLock.Lock()
defer s.songLock.Unlock()
if song.Name != s.songPlaying.Song.Name && s.songPlaying.Song.Name != "" {
log.Println("Error: Should not call next")
return
}
// Find next song
var topSong string
// Random first song
for key, _ := range s.songMap {
topSong = key
break
}
// Generate next values
for key, value := range s.songMap {
if value >= s.songMap[topSong] {
topSong = key
}
}
song.Name = topSong
// Update
s.songMap[song.Name] = 0
song.Score = s.songMap[song.Name]
msg := &Message{
Command: "play",
Song: song,
Time: int(makeTimestamp()),
}
log.Println("Now Playing: ", song.Name)
s.songPlaying = msg
s.sockWriteLoop(msg)
}
func (s *Server) sockPopUser(c *websocket.Conn) {
s.sockLock.Lock()
defer s.sockLock.Unlock()
for i := range s.sockUsers {
if s.sockUsers[i] == c {
s.sockUsers = append(s.sockUsers[:i], s.sockUsers[i+1:]...)
break
}
}
}
// Sock read loop
func (s *Server) sockReadLoop(c *websocket.Conn) {
var msg Message
for {
if err := websocket.ReadJSON(c, &msg); err != nil {
log.Println("SOCKET ERROR!")
log.Println(msg)
s.sockPopUser(c)
c.Close()
break
}
log.Println("sockReadLoop: Commad: ", msg.Command)
switch msg.Command {
case "plus":
s.plus(msg.Song)
case "minus":
s.minus(msg.Song)
case "next":
if msg.Song.Name != s.songPlaying.Song.Name && s.songPlaying.Song.Name != "" {
log.Println("New Stream")
log.Println(msg.Song.Name)
s.sockLock.Lock()
websocket.WriteJSON(c, s.songPlaying)
s.sockLock.Unlock()
log.Println(s.songPlaying.Command)
} else {
log.Println("New song")
s.next(msg.Song)
}
default:
log.Println("sockReadLoop: Command unknown, ", msg.Command)
}
}
}
// Sock write
func (s *Server) sockWriteLoop(data interface{}) {
s.sockLock.Lock()
defer s.sockLock.Unlock()
for i := range s.sockUsers {
c := s.sockUsers[i]
if err := websocket.WriteJSON(c, data); err != nil {
log.Println("sockWriteLoop: Error wrting json, ", err)
}
}
}
// Websocket handles
func (s *Server) sock(w http.ResponseWriter, r *http.Request) error {
c, err := upgrader.Upgrade(w, r, nil)
if err != nil {
return err
}
//defer c.Close()
// Log
log.Println("sock: Got new user!")
// Read
go s.sockReadLoop(c)
// Write
s.sockLock.Lock()
defer s.sockLock.Unlock()
s.sockUsers = append(s.sockUsers, c)
return nil
}
// Song generation
var isAudio = map[string]bool{
".mp3": true,
".ogg": true,
".wav": true,
}
func (s *Server) songGen() error {
s.songLock.Lock()
defer s.songLock.Unlock()
// Folders to serch for music... Need to expand to many files
files, err := ioutil.ReadDir("Music")
if err != nil {
return err
}
// Add files to library
for i := range files {
if !files[i].IsDir() && isAudio[strings.ToLower(filepath.Ext(files[i].Name()))] {
s.songMap[files[i].Name()] = 0
}
}
return nil
}
type Dukebox struct {
Address string
Songs []Song
}
func (s *Server) pageGen() (*bytes.Reader, error) {
s.songLock.Lock()
defer s.songLock.Unlock()
var songs []Song
for key, value := range s.songMap {
songs = append(songs, Song{Name: key, Score: value})
}
data := &Dukebox{
Address: s.addrs,
Songs: songs,
}
b := new(bytes.Buffer)
err := s.tmpl.ExecuteTemplate(b, "base.html", data)
if err != nil {
return nil, nil
}
return bytes.NewReader(b.Bytes()), nil
}
// Http handles
func (s *Server) client(w http.ResponseWriter, r *http.Request) error {
content, err := s.pageGen()
http.ServeContent(w, r, ".html", time.Now(), content)
return err
}
func (s *Server) audio(w http.ResponseWriter, r *http.Request) error {
path, err := url.QueryUnescape(strings.TrimPrefix(r.URL.String(), "/audio"))
if err != nil {
return err
}
f, err := os.Open("Music" + path)
defer f.Close()
if err != nil {
return err
}
log.Println("Audio Request!")
//w.Header().Set("X-Content-Duration", string(20))
//w.WriteHeader(http.StatusPartialContent)
http.ServeContent(w, r, "", time.Now(), f)
//http.ServeFile(w, r, "Music"+path)
return nil
}
func main() {
name, err := os.Hostname()
if err != nil {
fmt.Printf("Oops: %v\n", err)
return
}
addrs, err := net.LookupHost(name)
if err != nil {
fmt.Printf("Oops: %v\n", err)
return
}
tmpl, err := template.ParseFiles("base.html")
if err != nil {
fmt.Printf("Oops: %v\n", err)
return
}
// Server
s := &Server{
songLock: &sync.Mutex{},
songMap: make(map[string]int),
songPlaying: &Message{Song: Song{Name: ""}},
sockLock: &sync.Mutex{},
sockUsers: []*websocket.Conn{},
addrs: addrs[0] + ":8000",
tmpl: tmpl,
}
// Generate songs
if err := s.songGen(); err != nil {
log.Println(err)
}
log.Println(s.songMap)
// Http handles
http.HandleFunc("/", errorHandler(s.client))
http.HandleFunc("/audio/", errorHandler(s.audio))
http.HandleFunc("/sock", errorHandler(s.sock))
s.sServe("/list.min.js", "list.min.js")
s.sServe("/style.css", "style.css")
msg := &Message{
Command: "play",
Song: Song{Name: "sup", Score: 0},
Time: int(makeTimestamp()),
}
b, _ := json.Marshal(msg)
fmt.Println(string(b))
// Run
log.Println("Running: ", s.addrs)
err = http.ListenAndServe(":8000", nil)
if err != nil {
log.Fatal("ListenAndServe: ", err)
}
}