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dwelling-radio/internal/http/dj_handlers.go

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package http
import (
"dwelling-radio/internal/radio"
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"dwelling-radio/internal/statistics"
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"dwelling-radio/pkg/oggtag"
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"encoding/json"
"fmt"
"log"
"net/http"
"strings"
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"time"
)
type DJHandlers struct {
listeners *radio.ListenerCounter
playlist *radio.Playlist
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stats statistics.Statistics
curSong *radio.Song
listLen int64
fallbackSong string
}
func NewDJHandlers(l *radio.ListenerCounter, p *radio.Playlist,
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stats statistics.Statistics, cs *radio.Song, n int64, fS string) *DJHandlers {
return &DJHandlers{listeners: l, playlist: p,
stats: stats, curSong: cs, listLen: n, fallbackSong: fS}
}
func (dj *DJHandlers) ListenersUpdateIcecast(w http.ResponseWriter, r *http.Request) {
defer func() {
if err := recover(); err != nil {
log.Println("DJHandlers.ListenersUpdateIcecast panic:", err)
}
}()
if err := r.ParseForm(); err != nil {
log.Println("DJHandlers.ListenersUpdateIcecast:", err)
w.WriteHeader(http.StatusBadRequest)
return
}
switch r.FormValue("action") {
case "listener_add":
dj.listeners.Lock()
_ = dj.listeners.Inc()
dj.listeners.Unlock()
case "listener_remove":
dj.listeners.Lock()
defer dj.listeners.Unlock()
if _, err := dj.listeners.Dec(); err != nil {
log.Println("DJHandlers.ListenersUpdateIcecast:", err)
w.WriteHeader(http.StatusBadRequest)
return
}
default:
w.WriteHeader(http.StatusNotAcceptable)
return
}
w.Header().Add("Content-Type", "text/plain")
w.Header().Add("Icecast-Auth-User", "1")
w.WriteHeader(http.StatusOK)
}
const defaultArtistTag = "[LOL, no artist tag]"
const defaultTitleTag = "[No title tag for you -_-]"
const defaultTitleTagNoArtist = "[And no title tag either! Pffft]"
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func (dj *DJHandlers) PlaylistNext(w http.ResponseWriter, _ *http.Request) {
w.Header().Add("Content-Type", "text/plain")
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dj.playlist.Lock()
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nxt := dj.playlist.Next()
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dj.playlist.Unlock()
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if nxt == "" {
log.Println("the end of a playlist has been reached")
if nxt = dj.fallbackSong; nxt == "" {
log.Println("a fallback song is not set")
w.WriteHeader(http.StatusNotFound)
return
}
}
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oggf, err := oggtag.NewOggFile(nxt)
if err != nil {
log.Println("cannot read an OGG file", nxt, ":", err)
w.WriteHeader(http.StatusInternalServerError)
return
}
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newSong := radio.Song{
Artist: oggf.GetTag("artist"),
Title: oggf.GetTag("title"),
Duration: oggf.GetDuration(),
// Here 5 seconds are being added because it is approximately the
// time between the creation of this Song object and when ezstream
// actually starts to play it.
StartAt: time.Now()} // .Add(5 * time.Second)
if newSong.Artist == "" && newSong.Title == "" {
log.Println("Playlist:", nxt, "has no artist and title tags.")
newSong.Artist = defaultArtistTag
newSong.Title = defaultTitleTagNoArtist
} else if newSong.Artist == "" {
log.Println("Playlist:", nxt, "has no artist tag.")
newSong.Artist = defaultArtistTag
} else if newSong.Title == "" {
log.Println("Playlist:", nxt, "has no title tag.")
newSong.Title = defaultTitleTag
}
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if strings.HasSuffix(nxt, "/fallback.ogg") {
newSong.Artist = "Nothing to play. Playing a fallback: " + newSong.Artist
}
dj.listeners.Lock()
dj.curSong.Listeners, dj.curSong.PeakListeners = dj.listeners.Reset()
dj.listeners.Unlock()
if dj.curSong.Artist != "" && !strings.Contains(dj.curSong.Artist, "no artist tag") &&
!strings.Contains(dj.curSong.Artist, "No title tag") {
if err := dj.stats.Add(dj.curSong); err != nil {
log.Println("cannot add a song to a stats DB:", err)
}
}
*dj.curSong = newSong
dj.curSong.Listeners = 0
dj.curSong.PeakListeners = 0
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fmt.Fprintln(w, nxt)
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}
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func (dj *DJHandlers) Status(w http.ResponseWriter, r *http.Request) {
w.Header().Add("Content-Type", "application/json")
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lst, err := dj.stats.LastNSongs(dj.listLen)
if err != nil {
log.Println("failed to fetch last n songs:", err)
}
dj.listeners.RLock()
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defer dj.listeners.RUnlock()
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err = json.NewEncoder(w).Encode(&struct {
Current *radio.Song `json:"current_song,omitempty"`
Listeners int64 `json:"listeners"`
List []radio.Song `json:"last_songs,omitempty"`
}{
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Current: dj.curSong,
Listeners: dj.listeners.Current(),
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List: lst})
if err != nil {
log.Println("DJHandlers.Status:", err)
http.Error(w, "status parsing failed", http.StatusInternalServerError)
}
}