83 lines
3.5 KiB
C#
83 lines
3.5 KiB
C#
using MareSynchronosShared.Metrics;
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using MareSynchronosShared.Services;
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using Microsoft.Extensions.Options;
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using System.Collections.Concurrent;
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namespace MareSynchronosStaticFilesServer;
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public class CachedFileProvider
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{
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private readonly ILogger<CachedFileProvider> _logger;
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private readonly FileStatisticsService _fileStatisticsService;
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private readonly MareMetrics _metrics;
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private readonly Uri _remoteCacheSourceUri;
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private readonly string _basePath;
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private readonly ConcurrentDictionary<string, Task> _currentTransfers = new(StringComparer.Ordinal);
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private bool IsMainServer => _remoteCacheSourceUri == null;
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public CachedFileProvider(IConfigurationService<StaticFilesServerConfiguration> configuration, ILogger<CachedFileProvider> logger, FileStatisticsService fileStatisticsService, MareMetrics metrics)
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{
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_logger = logger;
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_fileStatisticsService = fileStatisticsService;
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_metrics = metrics;
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_remoteCacheSourceUri = configuration.GetValueOrDefault<Uri>(nameof(StaticFilesServerConfiguration.RemoteCacheSourceUri), null);
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_basePath = configuration.GetValue<string>(nameof(StaticFilesServerConfiguration.CacheDirectory));
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}
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private async Task DownloadTask(string hash, string auth)
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{
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// download file from remote
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var downloadUrl = new Uri(_remoteCacheSourceUri, hash);
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_logger.LogInformation("Did not find {hash}, downloading from {server}", hash, downloadUrl);
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using var client = new HttpClient();
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client.DefaultRequestHeaders.Add("Authorization", auth);
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var response = await client.GetAsync(downloadUrl, HttpCompletionOption.ResponseHeadersRead).ConfigureAwait(false);
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try
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{
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response.EnsureSuccessStatusCode();
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}
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catch (Exception ex)
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{
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_logger.LogWarning(ex, "Failed to download {url}", downloadUrl);
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return;
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}
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var fileName = FilePathUtil.GetFilePath(_basePath, hash);
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using var fileStream = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);
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var bufferSize = response.Content.Headers.ContentLength > 1024 * 1024 ? 4096 : 1024;
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var buffer = new byte[bufferSize];
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var bytesRead = 0;
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while ((bytesRead = await (await response.Content.ReadAsStreamAsync().ConfigureAwait(false)).ReadAsync(buffer).ConfigureAwait(false)) > 0)
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{
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await fileStream.WriteAsync(buffer.AsMemory(0, bytesRead)).ConfigureAwait(false);
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}
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_metrics.IncGauge(MetricsAPI.GaugeFilesTotal);
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_metrics.IncGauge(MetricsAPI.GaugeFilesTotalSize, FilePathUtil.GetFileInfoForHash(_basePath, hash).Length);
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}
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public async Task<FileStream?> GetFileStream(string hash, string auth)
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{
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var fi = FilePathUtil.GetFileInfoForHash(_basePath, hash);
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if (fi == null && IsMainServer) return null;
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if (fi == null && !_currentTransfers.ContainsKey(hash))
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{
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_currentTransfers[hash] = DownloadTask(hash, auth).ContinueWith(r => _currentTransfers.Remove(hash, out _));
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}
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if (fi == null && _currentTransfers.TryGetValue(hash, out var downloadTask))
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{
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await downloadTask.ConfigureAwait(false);
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}
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fi = FilePathUtil.GetFileInfoForHash(_basePath, hash);
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if (fi == null) return null;
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_fileStatisticsService.LogFile(hash, fi.Length);
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return new FileStream(fi.FullName, FileMode.Open, FileAccess.Read, FileShare.Inheritable | FileShare.Read);
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}
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} |