public void AddTrack(FmShellArguments args)
{
LOGGER.Info("Adding track by file path");
var audioSource = new Mp3FileAudioSource(args.Args[0].ToString());
RadioCastServer.AddTrack(audioSource);
}
private static Task StartRadioFeeder(RadioCastServer radioCastServer, MongoWrapper mongoWrapper)
{
var userCollection = mongoWrapper.Database.GetCollection <Models.Musician>(nameof(Models.User));
var songSortBuilder = new SortDefinitionBuilder <ProjectedMusicianSong>();
var songSort = songSortBuilder
.Descending(nameof(ProjectedMusicianSong.Score));
var userFilterBuilder = new FilterDefinitionBuilder <Models.Musician>();
var userFilter = userFilterBuilder.And
(
GeneralUtils.NotDeactivated(userFilterBuilder),
userFilterBuilder.AnyEq("_t", nameof(Models.Musician))
);
var songFilterBuilder = new FilterDefinitionBuilder <ProjectedMusicianSong>();
var songFilter = songFilterBuilder.And
(
GeneralUtils.NotDeactivated(songFilterBuilder, s => s.Song),
songFilterBuilder.Eq(s => s.Song.RadioAuthorized, true),
songFilterBuilder.Eq(s => s.Song.Original, true)
);
var projectionBuilder = new ProjectionDefinitionBuilder <Models.Musician>();
var projection = projectionBuilder.Include(m => m.FullName).Include(m => m.Songs);
var fsBucket = new GridFSBucket <ObjectId>(mongoWrapper.Database);
var trackHistory = new List <(IAudioSource, ProjectedMusicianSong)>();
var onTrackChangedTE = new ManualResetEvent(true);
radioCastServer.OnTrackChanged += async(s, e) =>
{
List <(IAudioSource, ProjectedMusicianSong)> myTrackHistory;
lock (trackHistory)
{
myTrackHistory = trackHistory.ToList();
}
RadioInfoController.CurrentSong = myTrackHistory.Where(th => th.Item1.Equals(e.NewTrack)).Select(th => th.Item2).LastOrDefault();
LOGGER.Info("Now playing: {}", JsonConvert.SerializeObject(RadioInfoController.CurrentSong));
onTrackChangedTE.Set();
if (e.OldTrack == null)
{
return;
}
var oldTrack = myTrackHistory.Where(th => th.Item1.Equals(e.OldTrack)).Select(th => th.Item2).LastOrDefault();
var oldMusicianId = oldTrack._id;
var oldTrackId = oldTrack.Song._id;
var musSongFilterBuilder = new FilterDefinitionBuilder <Models.Musician>();
var musSongFilter = musSongFilterBuilder.And
(
musSongFilterBuilder.Eq(m => m._id, oldMusicianId),
musSongFilterBuilder.ElemMatch(m => m.Songs, sg => sg._id == oldTrackId)
);
var musSongUpdate = new UpdateDefinitionBuilder <Models.Musician>()
.Inc($"{nameof(Models.Musician.Songs)}.$.{nameof(Song.TimesPlayedRadio)}", 1);
await userCollection.UpdateOneAsync(musSongFilter, musSongUpdate);
// Remove oldest, only keep 5 in history
if (myTrackHistory.Count > 5)
{
lock (trackHistory)
{
trackHistory.RemoveAt(0);
}
}
};
return(Task.Run(async() =>
{
while (true)
{
List <(IAudioSource, ProjectedMusicianSong)> myTrackHistory;
lock (trackHistory)
{
myTrackHistory = trackHistory.ToList();
}
var lookupStageRandomArr = $@"
{{
$lookup:
{{
from: ""randomNumbers"",
pipeline:
[
{{ $sample: {{ size: 2 }} }}
],
as: ""RandomArr""
}}
}}
";
// OK Vezes totais que a música foi tocada * 0.5
// OK Vezes totais que a música foi tocada na rádio * -1
// OK Se música está presente na lista das últimas 5 tocadas, -100
// OK Se o autor da música está presente na lista das últimas 5 tocadas, -50
// OK Pontuação aleatória para cada música, entre - 10 e + 10
// OK Número de dias desde o cadastramento da música * -1
// OK Há uma chance de 5% de multiplicar a pontuação resultante por -1 (efeito nostalgia)
var scoreStage = $@"
{{
$addFields:
{{
""Score"":
{{
$add:
[
{{
$multiply: [ ""$Song.timesPlayed"", 0.5 ]
}},
{{
$multiply: [ ""$Song.timesPlayedRadio"", -1 ]
}},
{{
$cond:
{{
if:
{{
$in: [ ""$_id"", [ {myTrackHistory.Select(th => $"ObjectId(\"{th.Item2._id.ToString()}\")").DefaultIfEmpty("").Aggregate((s1, s2) => $"{s1.TrimEnd(',')},{s2.TrimEnd(',')},").TrimEnd(',')} ] ]
}},
then: -50,
else: 0
}}
}},
{{
$cond:
{{
if:
{{
$in: [ ""$Song._id"", [ {myTrackHistory.Select(th => $"ObjectId(\"{th.Item2.Song._id.ToString()}\")").DefaultIfEmpty("").Aggregate((s1, s2) => $"{s1.TrimEnd(',')},{s2.TrimEnd(',')},").TrimEnd(',')} ] ]
}},
then: -100,
else: 0
}}
}},
{{
$add:
[
{{
$multiply:
[
{{ $toDecimal: {{ $arrayElemAt: [""$RandomArr.decimal"", 0] }} }},
21
]
}},
-10
]
}},
{{
$multiply:
[
{{
$divide:
[
{{
$subtract:
[
{{ $toDate: ""{DateTime.UtcNow.ToString("o")}"" }},
{{ $toDate: ""$Song._id"" }}
]
}},
NumberLong(""86400000"")
]
}},
{{
$cond:
{{
if:
{{
$gt:
[
{{ $toDecimal: {{ $arrayElemAt: [""$RandomArr.decimal"", 1] }} }},
NumberDecimal(""0.1"")
]
}},
then: -1,
else: 1
}}
}}
]
}}
]
}}
}}
}}";
LOGGER.Info("Score stage generated MongoDB query: {}", scoreStage);
var pipeline = PipelineDefinitionBuilder
.For <Models.Musician>()
.Match(userFilter)
.Unwind(m => m.Songs, new AggregateUnwindOptions <Models.Musician>
{
PreserveNullAndEmptyArrays = false,
IncludeArrayIndex = null,
})
.Project(m => new ProjectedMusicianSong
{
_id = m._id,
Song = (Song)m.Songs,
Score = 1,
})
.Match(songFilter)
.AppendStage <Musician, ProjectedMusicianSong, ProjectedMusicianSong>(lookupStageRandomArr)
.AppendStage <Musician, ProjectedMusicianSong, ProjectedMusicianSong>(scoreStage)
.Sort(songSort)
.Limit(1);
if (LOGGER.IsDebugEnabled)
{
LOGGER.Debug("Pipeline generated MongoDB query for song: {}", pipeline.ToString());
}
var findTask = userCollection.AggregateAsync(pipeline, new AggregateOptions
{
AllowDiskUse = true,
BatchSize = 1,
UseCursor = true,
Comment = "Radio Aggregate Query",
TranslationOptions = new ExpressionTranslationOptions
{
StringTranslationMode = AggregateStringTranslationMode.CodePoints
}
});
var findResult = await findTask;
var firstSong = findResult.SingleOrDefault();
// If no songs, wait a minute before checking again
// Mostly not to strain the CPU on development environments
if (firstSong?.Song == null)
{
Thread.Sleep(TimeSpan.FromMinutes(1));
continue;
}
LOGGER.Info("Next selected song: {}", JsonConvert.SerializeObject(firstSong));
var audioRef = firstSong.Song.AudioReference;
var gridId = audioRef._id;
var fileStreamTask = fsBucket.OpenDownloadStreamAsync(gridId, new GridFSDownloadOptions
{
Seekable = true,
CheckMD5 = false,
});
var audioSource = new Mp3FileAudioSource(await fileStreamTask, firstSong.Song.Name);
// Wait for the radio to need more songs before we add the track we have on our hands
while (radioCastServer.TrackCount > 1)
{
onTrackChangedTE.WaitOne();
onTrackChangedTE.Reset();
}
lock (trackHistory)
{
trackHistory.Add((audioSource, firstSong));
}
radioCastServer.AddTrack(audioSource);
}
}));
}
