Stream custom live channels using your own media
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using System.Threading;
using System.Threading.Channels;
using System.Threading.Tasks;
using ErsatzTV.Application.Playouts.Commands;
using ErsatzTV.Core;
using ErsatzTV.Core.Domain;
using ErsatzTV.Core.Interfaces.Repositories;
using LanguageExt;
using MediatR;
using static ErsatzTV.Application.ProgramSchedules.Mapper;
namespace ErsatzTV.Application.ProgramSchedules.Commands
{
public class
UpdateProgramScheduleHandler : IRequestHandler<UpdateProgramSchedule,
Either<BaseError, ProgramScheduleViewModel>>
{
private readonly ChannelWriter<IBackgroundServiceRequest> _channel;
private readonly IProgramScheduleRepository _programScheduleRepository;
public UpdateProgramScheduleHandler(
IProgramScheduleRepository programScheduleRepository,
ChannelWriter<IBackgroundServiceRequest> channel)
{
_programScheduleRepository = programScheduleRepository;
_channel = channel;
}
public Task<Either<BaseError, ProgramScheduleViewModel>> Handle(
UpdateProgramSchedule request,
CancellationToken cancellationToken) =>
Validate(request)
.MapT(c => ApplyUpdateRequest(c, request))
.Bind(v => v.ToEitherAsync());
private async Task<ProgramScheduleViewModel> ApplyUpdateRequest(
ProgramSchedule programSchedule,
UpdateProgramSchedule update)
{
// we only need to rebuild playouts if the playback order has been modified
bool needToRebuildPlayout =
programSchedule.MediaCollectionPlaybackOrder != update.MediaCollectionPlaybackOrder;
programSchedule.Name = update.Name;
programSchedule.MediaCollectionPlaybackOrder = update.MediaCollectionPlaybackOrder;
await _programScheduleRepository.Update(programSchedule);
if (needToRebuildPlayout)
{
foreach (Playout playout in programSchedule.Playouts)
{
await _channel.WriteAsync(new BuildPlayout(playout.Id, true));
}
}
return ProjectToViewModel(programSchedule);
}
private async Task<Validation<BaseError, ProgramSchedule>> Validate(UpdateProgramSchedule request) =>
(await ProgramScheduleMustExist(request), ValidateName(request))
.Apply((programScheduleToUpdate, _) => programScheduleToUpdate);
private async Task<Validation<BaseError, ProgramSchedule>> ProgramScheduleMustExist(
UpdateProgramSchedule updateProgramSchedule) =>
(await _programScheduleRepository.GetWithPlayouts(updateProgramSchedule.ProgramScheduleId))
.ToValidation<BaseError>("ProgramSchedule does not exist.");
private Validation<BaseError, string> ValidateName(UpdateProgramSchedule updateProgramSchedule) =>
updateProgramSchedule.NotEmpty(c => c.Name)
.Bind(_ => updateProgramSchedule.NotLongerThan(50)(c => c.Name));
}
}