Arav/dwelling-radio
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MostListenedSong was rewritten.

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This commit is contained in:
Alexander Andreev 2023-10-08 00:52:40 +04:00
parent d84d985962
commit 0d8032da46
Signed by: Arav
GPG Key ID: D22A817D95815393
5 changed files with 80 additions and 78 deletions
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9
cmd/dwelling-radio/main.go
View File

@ -37,8 +37,9 @@ func main() {
return
}
var mostListenedSong radio.MostListenedSong
if data, err := os.ReadFile(*mostListenedSongPath); err == nil {
if err := radio.LoadMostListenedSong(data); err != nil {
if err := mostListenedSong.Load(data); err != nil {
log.Fatalln(err)
}
}
@ -50,7 +51,7 @@ func main() {
log.Fatalln(err)
}
hand := ihttp.NewHandlers(*filelistPath, songList, lstnrs)
hand := ihttp.NewHandlers(*filelistPath, songList, lstnrs, &mostListenedSong)
r := httpr.New()
r.Handler(http.MethodGet, "/", hand.Index)
@ -64,7 +65,7 @@ func main() {
r.ServeStatic("/assets/*filepath", web.Assets())
djh := ihttp.NewDJHandlers(lstnrs, plylst, songList, *songListLen)
djh := ihttp.NewDJHandlers(lstnrs, plylst, songList, &mostListenedSong)
s := r.Sub("/api/listener")
s.Handler(http.MethodGet, "/", djh.ListenersGet)
@ -86,7 +87,7 @@ func main() {
}
defer func() {
fileData := radio.StoreMostListenedSong()
fileData := mostListenedSong.Store()
if fileData != nil {
err := os.WriteFile(*mostListenedSongPath, fileData, fs.ModePerm)
if err != nil {

15
internal/http/dj_handlers.go
View File

@ -14,10 +14,11 @@ type DJHandlers struct {
listeners *radio.ListenerCounter
playlist *radio.Playlist
songList *radio.SongList
mostLSong *radio.MostListenedSong
}
func NewDJHandlers(l *radio.ListenerCounter, p *radio.Playlist, sl *radio.SongList, slLen int) *DJHandlers {
return &DJHandlers{listeners: l, playlist: p, songList: sl}
func NewDJHandlers(l *radio.ListenerCounter, p *radio.Playlist, sl *radio.SongList, mls *radio.MostListenedSong) *DJHandlers {
return &DJHandlers{listeners: l, playlist: p, songList: sl, mostLSong: mls}
}
func (dj *DJHandlers) ListenersGet(w http.ResponseWriter, _ *http.Request) {
@ -65,8 +66,12 @@ func (dj *DJHandlers) PlaylistNext(w http.ResponseWriter, _ *http.Request) {
Duration: oggf.GetDuration(),
MaxListeners: dj.listeners.Current(),
StartAt: time.Now()}
if dj.songList.Current() != nil {
dj.mostLSong.Update(*dj.songList.Current())
}
dj.songList.Add(song)
radio.CheckAndUpdateMostListenedSong(*dj.songList.Current())
}()
}
fmt.Fprintln(w, nxt)
@ -106,7 +111,7 @@ func (dj *DJHandlers) Status(w http.ResponseWriter, r *http.Request) {
Current: curSong,
Listeners: dj.listeners,
List: dj.songList.List(),
Mls: radio.MostListened()})
Mls: dj.mostLSong.Get()})
if err != nil {
log.Println("DJHandlers.Status:", err)
http.Error(w, "status parsing failed", http.StatusInternalServerError)
@ -115,7 +120,7 @@ func (dj *DJHandlers) Status(w http.ResponseWriter, r *http.Request) {
func (dj *DJHandlers) MostListenedSong(w http.ResponseWriter, r *http.Request) {
w.Header().Add("Content-Type", "application/json")
mls := radio.MostListened()
mls := dj.mostLSong.Get()
if mls == nil {
w.WriteHeader(http.StatusNotFound)
return

8
internal/http/handlers.go
View File

@ -11,18 +11,20 @@ import (
type Handlers struct {
songList *radio.SongList
listeners *radio.ListenerCounter
mostLSong *radio.MostListenedSong
filelistPath string
}
func NewHandlers(filelistPath string, songList *radio.SongList, listeners *radio.ListenerCounter) *Handlers {
func NewHandlers(filelistPath string, songList *radio.SongList, listeners *radio.ListenerCounter, mls *radio.MostListenedSong) *Handlers {
return &Handlers{
songList: songList,
filelistPath: filelistPath,
listeners: listeners}
listeners: listeners,
mostLSong: mls}
}
func (h *Handlers) Index(w http.ResponseWriter, r *http.Request) {
web.Index(utils.MainSite(r.Host), h.songList, h.listeners, r, w)
web.Index(utils.MainSite(r.Host), h.songList, h.listeners, h.mostLSong.Get(), r, w)
}
func (h *Handlers) Playlist(w http.ResponseWriter, _ *http.Request) {

119
internal/radio/mostlistened.go
View File

@ -2,101 +2,96 @@ package radio
import (
"bytes"
"encoding/json"
"errors"
"strconv"
"sync"
"time"
"github.com/pkg/errors"
)
const MostListenedDateFormat = "02 January 2006"
var mlsChanged = false
const MostListenedDateFormat string = "02 January 2006"
// MostListenedSong holds a metadata for a most listened song.
type MostListenedSong struct {
Listeners int
Date time.Time
Song string
sync.RWMutex
Date time.Time `json:"date"`
Listeners int `json:"listeners"`
Song string `json:"song"`
changed bool
}
func (mls *MostListenedSong) DateString() string {
return mls.Date.Format(MostListenedDateFormat)
}
func (mls *MostListenedSong) MarshalJSON() ([]byte, error) {
return json.Marshal(&struct {
Song string `json:"song"`
Listeners int `json:"listeners"`
Date string `json:"date"`
}{
Song: mls.Song,
Listeners: mls.Listeners,
Date: mls.Date.UTC().Format(time.RFC3339)})
}
var mostListened MostListenedSong
// CheckAndUpdateMostListenedSong compares current most played song with
// provided `cur`rent song's listeners, and if it is larger, then it takes
// `prev`ious song's name.
//
// Why we take a previous song's name? Experimentally I noticed that Icecast
// writes amount of listeners that was by the very start of a next song. So
// it means that it was actually amount of listeners by the end of
// the previous song.
//
// So it would be fairer to give these listeners back to a song they was
// listening to.
func CheckAndUpdateMostListenedSong(cur Song) {
if cur.Artist == "" {
func (mls *MostListenedSong) Update(song Song) {
mls.Lock()
defer mls.Unlock()
if song.Artist == "" {
return
}
if cur.MaxListeners > mostListened.Listeners {
mostListened = MostListenedSong{
Listeners: cur.MaxListeners,
Date: cur.StartAt,
Song: cur.Artist + " - " + cur.Title}
if song.MaxListeners > mls.Listeners {
mls.Listeners = song.MaxListeners
mls.Date = song.StartAt
mls.Song = song.Artist + " - " + song.Title
mls.changed = true
}
mlsChanged = true
}
// MostListened returns song that currently is the song with most simultaneous
// listeners.
func MostListened() *MostListenedSong {
if mostListened.Date.Year() == 1 {
func (mls *MostListenedSong) Get() *MostListenedSong {
mls.RLock()
defer mls.RUnlock()
if mls.Date.Year() == 1 {
return nil
}
return &mostListened
return &MostListenedSong{
Date: mls.Date,
Listeners: mls.Listeners,
Song: mls.Song}
}
func LoadMostListenedSong(data []byte) (err error) {
// Load parses given data and fill a MostListenedSong.
func (mls *MostListenedSong) Load(data []byte) (err error) {
mls.Lock()
defer mls.Unlock()
lines := bytes.Split(data, []byte{'\n'})
if len(lines) != 3 {
return errors.New("lines count mismatch, should be 3")
}
mostListened = MostListenedSong{}
if mostListened.Date, err = time.Parse(time.RFC3339, string(lines[0])); err != nil {
return err
var date time.Time
if date, err = time.Parse(time.RFC3339, string(lines[0])); err != nil {
return errors.Wrap(err, "wrong date/time format")
}
if mostListened.Listeners, err = strconv.Atoi(string(lines[1])); err != nil {
return err
var listeners int
if listeners, err = strconv.Atoi(string(lines[1])); err != nil {
return errors.Wrap(err, "a listeners number failed to parse")
}
mostListened.Song = string(lines[2])
if len(lines[2]) == 0 {
return errors.New("a song is empty")
}
mls.Date = date
mls.Listeners = listeners
mls.Song = string(lines[2])
return nil
}
func StoreMostListenedSong() []byte {
if !mlsChanged {
// Store returns a byte slice of a marshalled to text MostListenedSong.
func (mls *MostListenedSong) Store() []byte {
if !mls.changed {
return nil
}
buf := make([]byte, 0, 30+len(mostListened.Song))
buf := make([]byte, 0, 30+len(mls.Song))
b := bytes.NewBuffer(buf)
b.WriteString(mostListened.Date.Format(time.RFC3339))
b.WriteString(mls.Date.Format(time.RFC3339))
b.WriteByte('\n')
b.WriteString(strconv.Itoa(mostListened.Listeners))
b.WriteString(strconv.Itoa(mls.Listeners))
b.WriteByte('\n')
b.WriteString(mostListened.Song)
b.WriteString(mls.Song)
return b.Bytes()
}

7
web/templates/index.pug
View File

@ -1,4 +1,4 @@
:go:func Index(mainSite string, songList *radio.SongList, listeners *radio.ListenerCounter, r *http.Request)
:go:func Index(mainSite string, songList *radio.SongList, listeners *radio.ListenerCounter, mls *radio.MostListenedSong, r *http.Request)
:go:import "dwelling-radio/internal/radio"
:go:import "dwelling-radio/pkg/utils"
@ -65,8 +65,7 @@ html(lang='en')
else
td
td #{song.Artist} - #{song.Title}
- ml := radio.MostListened()
if ml.Song != ""
p.right Most listened song was "#{ml.Song}" on #{utils.ToClientTimezone(ml.Date, r).Format(radio.MostListenedDateFormat)} with #[b #{ml.Listeners}] listeners.
if mls != nil
p.right Most listened song was "#{mls.Song}" on #{utils.ToClientTimezone(mls.Date, r).Format(radio.MostListenedDateFormat)} with #[b #{mls.Listeners}] listeners.
footer
| 2017—2023 Alexander "Arav" Andreev <#[a(href='mailto:me@arav.su') me@arav.su]> #[a(href=mainSite+'/privacy') Privacy statements]