Stream custom live channels using your own media
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using System.Threading;
using System.Threading.Tasks;
using ErsatzTV.Core;
using ErsatzTV.Core.Domain;
using ErsatzTV.Infrastructure.Data;
using ErsatzTV.Infrastructure.Extensions;
using LanguageExt;
using Microsoft.EntityFrameworkCore;
using Unit = LanguageExt.Unit;
namespace ErsatzTV.Application.Watermarks.Commands
{
public class DeleteWatermarkHandler : MediatR.IRequestHandler<DeleteWatermark, Either<BaseError, Unit>>
{
private readonly IDbContextFactory<TvContext> _dbContextFactory;
public DeleteWatermarkHandler(IDbContextFactory<TvContext> dbContextFactory) =>
_dbContextFactory = dbContextFactory;
public async Task<Either<BaseError, Unit>> Handle(
DeleteWatermark request,
CancellationToken cancellationToken)
{
await using TvContext dbContext = _dbContextFactory.CreateDbContext();
Validation<BaseError, ChannelWatermark> validation = await WatermarkMustExist(dbContext, request);
return await validation.Apply(p => DoDeletion(dbContext, p));
}
private static async Task<Unit> DoDeletion(TvContext dbContext, ChannelWatermark watermark)
{
await dbContext.Database.ExecuteSqlRawAsync(
$"UPDATE Channel SET WatermarkId = NULL WHERE WatermarkId = {watermark.Id}");
dbContext.ChannelWatermarks.Remove(watermark);
await dbContext.SaveChangesAsync();
return Unit.Default;
}
private static Task<Validation<BaseError, ChannelWatermark>> WatermarkMustExist(
TvContext dbContext,
DeleteWatermark request) =>
dbContext.ChannelWatermarks
.SelectOneAsync(p => p.Id, p => p.Id == request.WatermarkId)
.Map(o => o.ToValidation<BaseError>($"Watermark {request.WatermarkId} does not exist"));
}
}