66 lines
3.0 KiB
C#
66 lines
3.0 KiB
C#
using System.IO;
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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.Domain;
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using ErsatzTV.Core.Interfaces.Metadata;
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using ErsatzTV.Core.Interfaces.Repositories;
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using LanguageExt;
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using static LanguageExt.Prelude;
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namespace ErsatzTV.Application.MediaItems.Commands
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{
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public class
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RefreshMediaItemStatisticsHandler : MediatR.IRequestHandler<RefreshMediaItemStatistics, Either<BaseError, Unit>>
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{
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private readonly IConfigElementRepository _configElementRepository;
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private readonly ILocalStatisticsProvider _localStatisticsProvider;
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private readonly IMediaItemRepository _mediaItemRepository;
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public RefreshMediaItemStatisticsHandler(
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IMediaItemRepository mediaItemRepository,
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IConfigElementRepository configElementRepository,
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ILocalStatisticsProvider localStatisticsProvider)
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{
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_mediaItemRepository = mediaItemRepository;
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_configElementRepository = configElementRepository;
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_localStatisticsProvider = localStatisticsProvider;
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}
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public Task<Either<BaseError, Unit>> Handle(
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RefreshMediaItemStatistics request,
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CancellationToken cancellationToken) =>
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Validate(request)
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.MapT(RefreshStatistics)
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.Bind(v => v.ToEitherAsync());
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private async Task<Validation<BaseError, RefreshParameters>> Validate(RefreshMediaItemStatistics request) =>
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(await MediaItemMustExist(request).BindT(PathMustExist), await ValidateFFprobePath())
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.Apply((mediaItem, ffprobePath) => new RefreshParameters(mediaItem, ffprobePath));
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private Task<Validation<BaseError, MediaItem>> MediaItemMustExist(
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RefreshMediaItemStatistics refreshMediaItemStatistics) =>
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_mediaItemRepository.Get(refreshMediaItemStatistics.MediaItemId)
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.Map(
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maybeItem => maybeItem.ToValidation<BaseError>(
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$"[MediaItem] {refreshMediaItemStatistics.MediaItemId} does not exist."));
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private Validation<BaseError, MediaItem> PathMustExist(MediaItem mediaItem) =>
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Some(mediaItem)
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.Filter(item => File.Exists(item.Path))
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.ToValidation<BaseError>($"[Path] '{mediaItem.Path}' does not exist on the file system");
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private Task<Validation<BaseError, string>> ValidateFFprobePath() =>
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_configElementRepository.GetValue<string>(ConfigElementKey.FFprobePath)
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.FilterT(File.Exists)
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.Map(
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ffprobePath =>
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ffprobePath.ToValidation<BaseError>("FFprobe path does not exist on the file system"));
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private Task<Unit> RefreshStatistics(RefreshParameters parameters) =>
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_localStatisticsProvider.RefreshStatistics(parameters.FFprobePath, parameters.MediaItem).ToUnit();
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private record RefreshParameters(MediaItem MediaItem, string FFprobePath);
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}
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}
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