Initial
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Zurazan
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using LightlessSyncShared.Metrics;
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using LightlessSyncShared.Services;
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using LightlessSyncStaticFilesServer.Utils;
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using System.Collections.Concurrent;
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using System.Net.Http.Headers;
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using LightlessSyncShared.Utils;
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using LightlessSync.API.Routes;
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using LightlessSyncShared.Utils.Configuration;
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namespace LightlessSyncStaticFilesServer.Services;
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public sealed class CachedFileProvider : IDisposable
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{
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private readonly IConfigurationService<StaticFilesServerConfiguration> _configuration;
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private readonly ILogger<CachedFileProvider> _logger;
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private readonly FileStatisticsService _fileStatisticsService;
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private readonly LightlessMetrics _metrics;
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private readonly ServerTokenGenerator _generator;
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private readonly Uri _remoteCacheSourceUri;
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private readonly string _hotStoragePath;
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private readonly ConcurrentDictionary<string, Task> _currentTransfers = new(StringComparer.Ordinal);
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private readonly HttpClient _httpClient;
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private readonly SemaphoreSlim _downloadSemaphore = new(1, 1);
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private bool _disposed;
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private bool IsMainServer => _remoteCacheSourceUri == null && _isDistributionServer;
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private bool _isDistributionServer;
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public CachedFileProvider(IConfigurationService<StaticFilesServerConfiguration> configuration, ILogger<CachedFileProvider> logger,
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FileStatisticsService fileStatisticsService, LightlessMetrics metrics, ServerTokenGenerator generator)
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{
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_configuration = configuration;
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_logger = logger;
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_fileStatisticsService = fileStatisticsService;
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_metrics = metrics;
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_generator = generator;
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_remoteCacheSourceUri = configuration.GetValueOrDefault<Uri>(nameof(StaticFilesServerConfiguration.DistributionFileServerAddress), null);
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_isDistributionServer = configuration.GetValueOrDefault(nameof(StaticFilesServerConfiguration.IsDistributionNode), false);
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_hotStoragePath = configuration.GetValue<string>(nameof(StaticFilesServerConfiguration.CacheDirectory));
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_httpClient = new();
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_httpClient.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue("LightlessSyncServer", "1.0.0.0"));
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_httpClient.Timeout = TimeSpan.FromSeconds(300);
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}
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public void Dispose()
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{
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if (_disposed)
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{
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return;
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}
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_disposed = true;
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_httpClient?.Dispose();
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}
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private async Task DownloadTask(string hash)
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{
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var destinationFilePath = FilePathUtil.GetFilePath(_hotStoragePath, hash);
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// first check cold storage
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if (TryCopyFromColdStorage(hash, destinationFilePath)) return;
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// if cold storage is not configured or file not found or error is present try to download file from remote
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var downloadUrl = LightlessFiles.DistributionGetFullPath(_remoteCacheSourceUri, hash);
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_logger.LogInformation("Did not find {hash}, downloading from {server}", hash, downloadUrl);
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using var requestMessage = new HttpRequestMessage(HttpMethod.Get, downloadUrl);
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requestMessage.Headers.Authorization = new AuthenticationHeaderValue("Bearer", _generator.Token);
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HttpResponseMessage? response = null;
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try
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{
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response = await _httpClient.SendAsync(requestMessage).ConfigureAwait(false);
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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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response?.Dispose();
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return;
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}
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var tempFileName = destinationFilePath + ".dl";
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var fileStream = new FileStream(tempFileName, FileMode.Create, 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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using var content = await response.Content.ReadAsStreamAsync().ConfigureAwait(false);
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while ((bytesRead = await content.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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await fileStream.FlushAsync().ConfigureAwait(false);
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await fileStream.DisposeAsync().ConfigureAwait(false);
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File.Move(tempFileName, destinationFilePath, true);
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_metrics.IncGauge(MetricsAPI.GaugeFilesTotal);
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_metrics.IncGauge(MetricsAPI.GaugeFilesTotalSize, FilePathUtil.GetFileInfoForHash(_hotStoragePath, hash).Length);
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response.Dispose();
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}
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private bool TryCopyFromColdStorage(string hash, string destinationFilePath)
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{
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if (!_configuration.GetValueOrDefault(nameof(StaticFilesServerConfiguration.UseColdStorage), false)) return false;
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string coldStorageDir = _configuration.GetValueOrDefault(nameof(StaticFilesServerConfiguration.ColdStorageDirectory), string.Empty);
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if (string.IsNullOrEmpty(coldStorageDir)) return false;
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var coldStorageFilePath = FilePathUtil.GetFileInfoForHash(coldStorageDir, hash);
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if (coldStorageFilePath == null) return false;
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try
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{
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_logger.LogDebug("Copying {hash} from cold storage: {path}", hash, coldStorageFilePath);
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var tempFileName = destinationFilePath + ".dl";
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File.Copy(coldStorageFilePath.FullName, tempFileName, true);
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File.Move(tempFileName, destinationFilePath, true);
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coldStorageFilePath.LastAccessTimeUtc = DateTime.UtcNow;
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var destinationFile = new FileInfo(destinationFilePath);
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destinationFile.LastAccessTimeUtc = DateTime.UtcNow;
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destinationFile.CreationTimeUtc = DateTime.UtcNow;
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destinationFile.LastWriteTimeUtc = DateTime.UtcNow;
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_metrics.IncGauge(MetricsAPI.GaugeFilesTotal);
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_metrics.IncGauge(MetricsAPI.GaugeFilesTotalSize, new FileInfo(destinationFilePath).Length);
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return true;
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}
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catch (Exception ex)
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{
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_logger.LogWarning(ex, "Could not copy {coldStoragePath} from cold storage", coldStorageFilePath);
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}
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return false;
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}
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public async Task DownloadFileWhenRequired(string hash)
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{
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var fi = FilePathUtil.GetFileInfoForHash(_hotStoragePath, hash);
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if (fi == null && IsMainServer)
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{
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TryCopyFromColdStorage(hash, FilePathUtil.GetFilePath(_hotStoragePath, hash));
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return;
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}
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await _downloadSemaphore.WaitAsync().ConfigureAwait(false);
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if ((fi == null || (fi?.Length ?? 0) == 0)
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&& (!_currentTransfers.TryGetValue(hash, out var downloadTask)
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|| (downloadTask?.IsCompleted ?? true)))
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{
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_currentTransfers[hash] = Task.Run(async () =>
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{
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try
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{
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_metrics.IncGauge(MetricsAPI.GaugeFilesDownloadingFromCache);
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await DownloadTask(hash).ConfigureAwait(false);
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}
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catch (Exception ex)
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{
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_logger.LogWarning(ex, "Error during Download Task for {hash}", hash);
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}
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finally
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{
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_metrics.DecGauge(MetricsAPI.GaugeFilesDownloadingFromCache);
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_currentTransfers.Remove(hash, out _);
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}
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});
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}
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_downloadSemaphore.Release();
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}
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public FileInfo? GetLocalFilePath(string hash)
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{
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var fi = FilePathUtil.GetFileInfoForHash(_hotStoragePath, hash);
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if (fi == null) return null;
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fi.LastAccessTimeUtc = DateTime.UtcNow;
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_fileStatisticsService.LogFile(hash, fi.Length);
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return new FileInfo(fi.FullName);
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}
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public async Task<FileInfo?> DownloadAndGetLocalFileInfo(string hash)
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{
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await DownloadFileWhenRequired(hash).ConfigureAwait(false);
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if (_currentTransfers.TryGetValue(hash, out var downloadTask))
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{
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try
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{
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using CancellationTokenSource cts = new();
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cts.CancelAfter(TimeSpan.FromSeconds(300));
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_metrics.IncGauge(MetricsAPI.GaugeFilesTasksWaitingForDownloadFromCache);
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await downloadTask.WaitAsync(cts.Token).ConfigureAwait(false);
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}
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catch (Exception e)
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{
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_logger.LogWarning(e, "Failed while waiting for download task for {hash}", hash);
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return null;
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}
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finally
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{
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_metrics.DecGauge(MetricsAPI.GaugeFilesTasksWaitingForDownloadFromCache);
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}
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}
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return GetLocalFilePath(hash);
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}
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public bool AnyFilesDownloading(List<string> hashes)
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{
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return hashes.Exists(_currentTransfers.Keys.Contains);
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}
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}
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