45 lines
1.5 KiB
C#
45 lines
1.5 KiB
C#
using System;
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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 LanguageExt;
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using MediatR;
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using Microsoft.Extensions.Caching.Memory;
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using Winista.Mime;
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namespace ErsatzTV.Application.Images.Queries
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{
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public class GetImageContentsHandler : IRequestHandler<GetImageContents, Either<BaseError, ImageViewModel>>
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{
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private static readonly MimeTypes MimeTypes = new();
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private readonly IMemoryCache _memoryCache;
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public GetImageContentsHandler(IMemoryCache memoryCache) => _memoryCache = memoryCache;
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public async Task<Either<BaseError, ImageViewModel>> Handle(
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GetImageContents request,
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CancellationToken cancellationToken)
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{
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try
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{
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return await _memoryCache.GetOrCreateAsync(
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request.FileName,
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async entry =>
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{
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entry.SlidingExpiration = TimeSpan.FromHours(1);
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string fileName = Path.Combine(FileSystemLayout.ImageCacheFolder, request.FileName);
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byte[] contents = await File.ReadAllBytesAsync(fileName, cancellationToken);
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MimeType mimeType = MimeTypes.GetMimeType(contents);
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return new ImageViewModel(contents, mimeType.Name);
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});
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}
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catch (Exception ex)
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{
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return BaseError.New(ex.Message);
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}
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}
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}
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}
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