Golang interfaces.Track类代码示例

// InsertTrack inserts track `t` at position `i` in the queue.
func (q *Queue) InsertTrack(i int, t interfaces.Track) error {
	q.mutex.Lock()
	beforeLen := len(q.Queue)

	// An error should never occur here since maxTrackDuration is restricted to
	// ints. Any error in the configuration will be caught during yaml load.
	maxTrackDuration, _ := time.ParseDuration(fmt.Sprintf("%ds",
		viper.GetInt("queue.max_track_duration")))

	if viper.GetInt("queue.max_track_duration") == 0 ||
		t.GetDuration() <= maxTrackDuration {
		q.Queue = append(q.Queue, Track{})
		copy(q.Queue[i+1:], q.Queue[i:])
		q.Queue[i] = t
	} else {
		q.mutex.Unlock()
		return errors.New("The track is too long to add to the queue")
	}
	if len(q.Queue) == beforeLen+1 {
		q.mutex.Unlock()
		q.playIfNeeded()
		return nil
	}
	q.mutex.Unlock()
	return errors.New("Could not add track to queue")
}

// Delete deletes the audio file associated with the incoming `track` object.
func (yt *YouTubeDL) Delete(t interfaces.Track) error {
	if !viper.GetBool("cache.enabled") {
		filePath := os.ExpandEnv(viper.GetString("cache.directory") + "/" + t.GetFilename())
		if _, err := os.Stat(filePath); err == nil {
			if err := os.Remove(filePath); err == nil {
				return nil
			}
			return errors.New("An error occurred while deleting the audio file")
		}
	}
	return nil
}

// Execute executes the command with the given user and arguments.
// Return value descriptions:
//    string: A message to be returned to the user upon successful execution.
//    bool:   Whether the message should be private or not. true = private,
//            false = public (sent to whole channel).
//    error:  An error message to be returned upon unsuccessful execution.
//            If no error has occurred, pass nil instead.
// Example return statement:
//    return "This is a private message!", true, nil
func (c *CurrentTrackCommand) Execute(user *gumble.User, args ...string) (string, bool, error) {
	var (
		currentTrack interfaces.Track
		err          error
	)

	if currentTrack, err = DJ.Queue.CurrentTrack(); err != nil {
		return "", true, errors.New(viper.GetString("commands.common_messages.no_tracks_error"))
	}

	return fmt.Sprintf(viper.GetString("commands.currenttrack.messages.current_track"),
		currentTrack.GetTitle(), currentTrack.GetSubmitter()), true, nil
}

// Execute executes the command with the given user and arguments.
// Return value descriptions:
//    string: A message to be returned to the user upon successful execution.
//    bool:   Whether the message should be private or not. true = private,
//            false = public (sent to whole channel).
//    error:  An error message to be returned upon unsuccessful execution.
//            If no error has occurred, pass nil instead.
// Example return statement:
//    return "This is a private message!", true, nil
func (c *AddNextCommand) Execute(user *gumble.User, args ...string) (string, bool, error) {
	var (
		allTracks      []interfaces.Track
		tracks         []interfaces.Track
		service        interfaces.Service
		err            error
		lastTrackAdded interfaces.Track
	)

	if len(args) == 0 {
		return "", true, errors.New(viper.GetString("commands.add.messages.no_url_error"))
	}

	for _, arg := range args {
		if service, err = DJ.GetService(arg); err == nil {
			tracks, err = service.GetTracks(arg, user)
			if err == nil {
				allTracks = append(allTracks, tracks...)
			}
		}
	}

	if len(allTracks) == 0 {
		return "", true, errors.New(viper.GetString("commands.add.messages.no_valid_tracks_error"))
	}

	numTooLong := 0
	numAdded := 0
	// We must loop backwards here to preserve the track order when inserting tracks.
	for i := len(allTracks) - 1; i >= 0; i-- {
		if err = DJ.Queue.InsertTrack(1, allTracks[i]); err != nil {
			numTooLong++
		} else {
			numAdded++
			lastTrackAdded = allTracks[i]
		}
	}

	if numAdded == 0 {
		return "", true, errors.New(viper.GetString("commands.add.messages.tracks_too_long_error"))
	} else if numAdded == 1 {
		return fmt.Sprintf(viper.GetString("commands.add.messages.one_track_added"),
			user.Name, lastTrackAdded.GetTitle(), lastTrackAdded.GetService()), false, nil
	}

	retString := fmt.Sprintf(viper.GetString("commands.add.messages.many_tracks_added"), user.Name, numAdded)
	if numTooLong != 0 {
		retString += fmt.Sprintf(viper.GetString("commands.add.messages.num_tracks_too_long"), numTooLong)
	}
	return retString, false, nil
}

// Execute executes the command with the given user and arguments.
// Return value descriptions:
//    string: A message to be returned to the user upon successful execution.
//    bool:   Whether the message should be private or not. true = private,
//            false = public (sent to whole channel).
//    error:  An error message to be returned upon unsuccessful execution.
//            If no error has occurred, pass nil instead.
// Example return statement:
//    return "This is a private message!", true, nil
func (c *AddCommand) Execute(user *gumble.User, args ...string) (string, bool, error) {
	var (
		allTracks      []interfaces.Track
		tracks         []interfaces.Track
		service        interfaces.Service
		err            error
		lastTrackAdded interfaces.Track
	)

	if len(args) == 0 {
		return "", true, errors.New(viper.GetString("commands.add.messages.no_url_error"))
	}

	for _, arg := range args {
		if service, err = DJ.GetService(arg); err == nil {
			tracks, err = service.GetTracks(arg, user)
			if err == nil {
				allTracks = append(allTracks, tracks...)
			}
		}
	}

	if len(allTracks) == 0 {
		return "", true, errors.New(viper.GetString("commands.add.messages.no_valid_tracks_error"))
	}

	numTooLong := 0
	numAdded := 0
	for _, track := range allTracks {
		if err = DJ.Queue.AppendTrack(track); err != nil {
			numTooLong++
		} else {
			numAdded++
			lastTrackAdded = track
		}
	}

	if numAdded == 0 {
		return "", true, errors.New(viper.GetString("commands.add.messages.tracks_too_long_error"))
	} else if numAdded == 1 {
		return fmt.Sprintf(viper.GetString("commands.add.messages.one_track_added"),
			user.Name, lastTrackAdded.GetTitle(), lastTrackAdded.GetService()), false, nil
	}

	retString := fmt.Sprintf(viper.GetString("commands.add.messages.many_tracks_added"), user.Name, numAdded)
	if numTooLong != 0 {
		retString += fmt.Sprintf(viper.GetString("commands.add.messages.num_tracks_too_long"), numTooLong)
	}
	return retString, false, nil
}

// Execute executes the command with the given user and arguments.
// Return value descriptions:
//    string: A message to be returned to the user upon successful execution.
//    bool:   Whether the message should be private or not. true = private,
//            false = public (sent to whole channel).
//    error:  An error message to be returned upon unsuccessful execution.
//            If no error has occurred, pass nil instead.
// Example return statement:
//    return "This is a private message!", true, nil
func (c *ForceSkipPlaylistCommand) Execute(user *gumble.User, args ...string) (string, bool, error) {
	var (
		currentTrack interfaces.Track
		err          error
	)

	if currentTrack, err = DJ.Queue.CurrentTrack(); err != nil {
		return "", true, errors.New(viper.GetString("commands.common_messages.no_tracks_error"))
	}

	if playlist := currentTrack.GetPlaylist(); playlist == nil {
		return "", true, errors.New(viper.GetString("commands.forceskipplaylist.messages.no_playlist_error"))
	}

	DJ.Queue.SkipPlaylist()

	return fmt.Sprintf(viper.GetString("commands.forceskipplaylist.messages.playlist_skipped"),
		user.Name), false, nil
}

// Execute executes the command with the given user and arguments.
// Return value descriptions:
//    string: A message to be returned to the user upon successful execution.
//    bool:   Whether the message should be private or not. true = private,
//            false = public (sent to whole channel).
//    error:  An error message to be returned upon unsuccessful execution.
//            If no error has occurred, pass nil instead.
// Example return statement:
//    return "This is a private message!", true, nil
func (c *SkipPlaylistCommand) Execute(user *gumble.User, args ...string) (string, bool, error) {
	var (
		currentTrack interfaces.Track
		err          error
	)

	if currentTrack, err = DJ.Queue.CurrentTrack(); err != nil {
		return "", true, errors.New(viper.GetString("commands.common_messages.no_tracks_error"))
	}

	if playlist := currentTrack.GetPlaylist(); playlist == nil {
		return "", true, errors.New(viper.GetString("commands.skipplaylist.messages.no_playlist_error"))
	}
	if currentTrack.GetPlaylist().GetSubmitter() == user.Name {
		DJ.Queue.SkipPlaylist()
		return fmt.Sprintf(viper.GetString("commands.skipplaylist.messages.submitter_voted"), user.Name), false, nil
	}
	if err := DJ.Skips.AddPlaylistSkip(user); err != nil {
		return "", true, errors.New(viper.GetString("commands.skipplaylist.messages.already_voted_error"))
	}

	return fmt.Sprintf(viper.GetString("commands.skipplaylist.messages.voted"), user.Name), false, nil
}

// Download downloads the audio associated with the incoming `track` object
// and stores it `track.Filename`.
func (yt *YouTubeDL) Download(t interfaces.Track) error {
	player := "--prefer-ffmpeg"
	if viper.GetString("defaults.player_command") == "avconv" {
		player = "--prefer-avconv"
	}

	filepath := os.ExpandEnv(viper.GetString("cache.directory") + "/" + t.GetFilename())

	// Determine which format to use.
	format := "bestaudio"
	for _, service := range DJ.AvailableServices {
		if service.GetReadableName() == t.GetService() {
			format = service.GetFormat()
		}
	}

	// Check to see if track is already downloaded.
	if _, err := os.Stat(filepath); os.IsNotExist(err) {
		var cmd *exec.Cmd
		if t.GetService() == "Mixcloud" {
			cmd = exec.Command("youtube-dl", "--verbose", "--no-mtime", "--output", filepath, "--format", format, "--external-downloader", "aria2c", player, t.GetURL())
		} else {
			cmd = exec.Command("youtube-dl", "--verbose", "--no-mtime", "--output", filepath, "--format", format, player, t.GetURL())
		}
		output, err := cmd.CombinedOutput()
		if err != nil {
			args := ""
			for s := range cmd.Args {
				args += cmd.Args[s] + " "
			}
			logrus.Warnf("%s\n%s\nyoutube-dl: %s", args, string(output), err.Error())
			return errors.New("Track download failed")
		}

		if viper.GetBool("cache.enabled") {
			DJ.Cache.CheckDirectorySize()
		}
	}

	return nil
}