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* moved the queue and added a couple of util functions + tests * added the queue command * gofmt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| package music | ||
|
|
||
| import ( | ||
| "log" | ||
| "sync" | ||
|
|
||
| "errors" | ||
| "github.com/vansante/go-event-emitter" | ||
| "time" | ||
| ) | ||
|
|
||
| const ( | ||
| songAdded eventemitter.EventType = "song-added" | ||
| ) | ||
|
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| // Queue holds an array of songs | ||
| type Queue struct { | ||
| *eventemitter.Emitter | ||
| songs []*Song | ||
| lock sync.Mutex | ||
| } | ||
|
|
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| func (queue *Queue) Append(songs ...*Song) { | ||
| queue.lock.Lock() | ||
| defer queue.lock.Unlock() | ||
|
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| queue.songs = append(queue.songs, songs...) | ||
| log.Println("Song added to the queue") | ||
| queue.EmitEvent(songAdded) | ||
| } | ||
|
|
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| // GetNext returns the next item in the queue if it exists | ||
| func (queue *Queue) GetNext() *Song { | ||
| queue.lock.Lock() | ||
| defer queue.lock.Unlock() | ||
|
|
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| return queue.getNext() | ||
| } | ||
|
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| func (queue *Queue) getNext() *Song { | ||
| if len(queue.songs) == 0 { | ||
| return nil | ||
| } | ||
| song, remaining := queue.songs[0], queue.songs[1:] | ||
|
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| queue.songs = remaining | ||
|
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| return song | ||
| } | ||
|
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| func (queue *Queue) GetLength() int { | ||
| queue.lock.Lock() | ||
| defer queue.lock.Unlock() | ||
|
|
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| return len(queue.songs) | ||
| } | ||
|
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| func (queue *Queue) GetTotalDuration() time.Duration { | ||
| queue.lock.Lock() | ||
| defer queue.lock.Unlock() | ||
|
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| var duration time.Duration | ||
|
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| for _, song := range queue.songs { | ||
| duration = duration + song.Duration | ||
| } | ||
|
|
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| return duration.Round(time.Second) | ||
| } | ||
|
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| func (queue *Queue) GetNextN(limit int) ([]Song, error) { | ||
| if limit <= 0 { | ||
| return nil, errors.New("limit must be greater than 0") | ||
| } | ||
|
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| queue.lock.Lock() | ||
| defer queue.lock.Unlock() | ||
|
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| if len(queue.songs) < limit { | ||
| limit = len(queue.songs) | ||
| } | ||
|
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| result := make([]Song, limit) | ||
| for i := 0; i < limit; i++ { | ||
| result[i] = *queue.songs[i] | ||
| } | ||
|
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| return result, nil | ||
| } | ||
|
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| // WaitForNext is a blocking call that returns the next song in the queue and wait for one to be added | ||
| // if there is no song available. | ||
| func (queue *Queue) WaitForNext() *Song { | ||
| next := queue.GetNext() | ||
|
|
||
| if next != nil { | ||
| return next | ||
| } | ||
|
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| done := make(chan struct{}) | ||
| queue.ListenOnce(songAdded, func(args ...interface{}) { | ||
| done <- struct{}{} | ||
| }) | ||
|
|
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| <-done | ||
| return queue.GetNext() | ||
| } | ||
|
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| // NewQueue creates a new instance of Queue | ||
| func NewQueue() *Queue { | ||
| return &Queue{ | ||
| songs: make([]*Song, 0), | ||
| Emitter: eventemitter.NewEmitter(true), | ||
| } | ||
| } |
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