private async Task <Either <BaseError, string> > GetPlaylist(
GetHlsPlaylistByChannelNumber request,
Channel channel)
{
DateTimeOffset now = DateTimeOffset.Now;
Option <PlayoutItem> maybePlayoutItem = await _playoutRepository.GetPlayoutItem(channel.Id, now);
return(maybePlayoutItem.Match <Either <BaseError, string> >(
playoutItem =>
{
double timeRemaining = Math.Abs((playoutItem.Finish - now).TotalSeconds);
return $@"#EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:18000
#EXTINF:{timeRemaining:F2},
{request.Scheme}://{request.Host}/ffmpeg/stream/{request.ChannelNumber}
";
},
() =>
{
// TODO: playlist for error stream
Log.Logger.Error("Unable to locate playout item for m3u8");
return BaseError.New($"Unable to locate playout item for channel {channel.Number}");
}));
}
public async Task <Either <BaseError, string> > Handle(
GetHlsPlaylistByChannelNumber request,
CancellationToken cancellationToken)
{
await using TvContext dbContext = await _dbContextFactory.CreateDbContextAsync(cancellationToken);
DateTimeOffset now = DateTimeOffset.Now;
Validation <BaseError, Parameters> validation = await Validate(dbContext, request, now);
return(await LanguageExtensions.Apply(
validation,
parameters => GetPlaylist(dbContext, request, parameters, now)));
}
private Task <string> GetPlaylist(
TvContext dbContext,
GetHlsPlaylistByChannelNumber request,
Parameters parameters,
DateTimeOffset now)
{
string mode = string.IsNullOrWhiteSpace(request.Mode)
? string.Empty
: $"&mode={request.Mode}";
long index = GetIndexForChannel(parameters.Channel, parameters.PlayoutItem);
double timeRemaining = Math.Abs((parameters.PlayoutItem.FinishOffset - now).TotalSeconds);
return($@"#EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:10
#EXT-X-MEDIA-SEQUENCE:{index}
#EXT-X-DISCONTINUITY
#EXTINF:{timeRemaining:F2},
{request.Scheme}://{request.Host}/ffmpeg/stream/{request.ChannelNumber}?index={index}{mode}
".AsTask());
}
private async Task <Validation <BaseError, Channel> > ChannelMustExist(GetHlsPlaylistByChannelNumber request) =>
(await _channelRepository.GetByNumber(request.ChannelNumber))
.ToValidation <BaseError>($"Channel number {request.ChannelNumber} does not exist.");
public Task <Either <BaseError, string> > Handle(
GetHlsPlaylistByChannelNumber request,
CancellationToken cancellationToken) =>
ChannelMustExist(request)
.Map(v => v.ToEither <Channel>())
.BindT(channel => GetPlaylist(request, channel));
private static Task <Validation <BaseError, Channel> > ChannelMustExist(
TvContext dbContext,
GetHlsPlaylistByChannelNumber request) =>
dbContext.Channels
.SelectOneAsync(c => c.Number, c => c.Number == request.ChannelNumber)
.Map(o => o.ToValidation <BaseError>($"Channel number {request.ChannelNumber} does not exist."));
private Task <Validation <BaseError, Parameters> > Validate(
TvContext dbContext,
GetHlsPlaylistByChannelNumber request,
DateTimeOffset now) =>
ChannelMustExist(dbContext, request)
.BindT(channel => PlayoutItemMustExist(dbContext, channel, now));
