29 lines
1.1 KiB
C#
29 lines
1.1 KiB
C#
using System.Threading;
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using System.Threading.Tasks;
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using ErsatzTV.Core;
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using ErsatzTV.Core.Interfaces.Repositories;
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using LanguageExt;
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using MediatR;
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namespace ErsatzTV.Application.Channels.Commands
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{
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public class DeleteChannelHandler : IRequestHandler<DeleteChannel, Either<BaseError, Task>>
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{
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private readonly IChannelRepository _channelRepository;
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public DeleteChannelHandler(IChannelRepository channelRepository) => _channelRepository = channelRepository;
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public async Task<Either<BaseError, Task>> Handle(DeleteChannel request, CancellationToken cancellationToken) =>
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(await ChannelMustExist(request))
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.Map(DoDeletion)
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.ToEither<Task>();
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private Task DoDeletion(int channelId) => _channelRepository.Delete(channelId);
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private async Task<Validation<BaseError, int>> ChannelMustExist(DeleteChannel deleteChannel) =>
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(await _channelRepository.Get(deleteChannel.ChannelId))
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.ToValidation<BaseError>($"Channel {deleteChannel.ChannelId} does not exist.")
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.Map(c => c.Id);
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}
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}
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