98 lines
2.0 KiB
Go
98 lines
2.0 KiB
Go
package radio
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import (
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"bytes"
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"strconv"
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"sync"
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"time"
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"github.com/pkg/errors"
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)
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const MostListenedDateFormat string = "02 January 2006 at 15:04:05 MST"
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// MostListenedSong holds a metadata for a most listened song.
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type MostListenedSong struct {
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sync.RWMutex
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Date time.Time `json:"date"`
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Listeners int `json:"listeners"`
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Song string `json:"song"`
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changed bool
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}
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func (mls *MostListenedSong) Update(song Song) {
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mls.Lock()
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defer mls.Unlock()
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if song.Artist == "" {
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return
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}
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if song.MaxListeners > mls.Listeners {
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mls.Listeners = song.MaxListeners
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mls.Date = song.StartAt
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mls.Song = song.Artist + " - " + song.Title
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mls.changed = true
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}
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}
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func (mls *MostListenedSong) Get() *MostListenedSong {
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mls.RLock()
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defer mls.RUnlock()
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if mls.Date.Year() == 1 {
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return nil
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}
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return &MostListenedSong{
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Date: mls.Date,
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Listeners: mls.Listeners,
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Song: mls.Song}
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}
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// Load parses given data and fill a MostListenedSong.
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func (mls *MostListenedSong) Load(data []byte) (err error) {
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mls.Lock()
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defer mls.Unlock()
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lines := bytes.Split(data, []byte{'\n'})
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if len(lines) != 3 {
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return errors.New("lines count mismatch, should be 3")
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}
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var date time.Time
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if date, err = time.Parse(time.RFC3339, string(lines[0])); err != nil {
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return errors.Wrap(err, "wrong date/time format")
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}
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var listeners int
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if listeners, err = strconv.Atoi(string(lines[1])); err != nil {
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return errors.Wrap(err, "a listeners number failed to parse")
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}
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if len(lines[2]) == 0 {
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return errors.New("a song is empty")
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}
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mls.Date = date
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mls.Listeners = listeners
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mls.Song = string(lines[2])
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return nil
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}
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// Store returns a byte slice of a marshalled to text MostListenedSong.
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func (mls *MostListenedSong) Store() []byte {
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if !mls.changed {
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return nil
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}
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buf := make([]byte, 0, 30+len(mls.Song))
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b := bytes.NewBuffer(buf)
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b.WriteString(mls.Date.Format(time.RFC3339))
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b.WriteByte('\n')
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b.WriteString(strconv.Itoa(mls.Listeners))
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b.WriteByte('\n')
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b.WriteString(mls.Song)
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return b.Bytes()
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}
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