Stream custom live channels using your own media
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using System;
using System.Diagnostics;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using ErsatzTV.Core;
using ErsatzTV.Core.Domain;
using ErsatzTV.Core.Interfaces.Repositories;
using LanguageExt;
using MediatR;
using static LanguageExt.Prelude;
namespace ErsatzTV.Application.Streaming.Queries
{
public abstract class FFmpegProcessHandler<T> : IRequestHandler<T, Either<BaseError, Process>>
where T : FFmpegProcessRequest
{
private readonly IChannelRepository _channelRepository;
private readonly IConfigElementRepository _configElementRepository;
protected FFmpegProcessHandler(
IChannelRepository channelRepository,
IConfigElementRepository configElementRepository)
{
_channelRepository = channelRepository;
_configElementRepository = configElementRepository;
}
public Task<Either<BaseError, Process>> Handle(T request, CancellationToken cancellationToken) =>
Validate(request)
.Map(v => v.ToEither<Tuple<Channel, string>>())
.BindT(tuple => GetProcess(request, tuple.Item1, tuple.Item2));
protected abstract Task<Either<BaseError, Process>> GetProcess(T request, Channel channel, string ffmpegPath);
private async Task<Validation<BaseError, Tuple<Channel, string>>> Validate(T request) =>
(await ChannelMustExist(request), await FFmpegPathMustExist())
.Apply((channel, ffmpegPath) => Tuple(channel, ffmpegPath));
private async Task<Validation<BaseError, Channel>> ChannelMustExist(T request) =>
(await _channelRepository.GetByNumber(request.ChannelNumber))
.ToValidation<BaseError>($"Channel number {request.ChannelNumber} does not exist.");
private Task<Validation<BaseError, string>> FFmpegPathMustExist() =>
_configElementRepository.GetValue<string>(ConfigElementKey.FFmpegPath)
.FilterT(File.Exists)
.Map(maybePath => maybePath.ToValidation<BaseError>("FFmpeg path does not exist on filesystem"));
}
}