mirror of
https://github.com/ClemensFischer/XAML-Map-Control.git
synced 2025-12-06 07:12:04 +01:00
Store expiration in file creation time. Cyclic cleaning.
This commit is contained in:
ClemensFischer
parent
d31f522c52
commit
11ed14c823
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@ -9,7 +9,6 @@ using System;
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using System.Diagnostics;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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@ -18,25 +17,38 @@ namespace MapControl.Caching
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/// <summary>
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/// IDistributedCache implementation based on local image files.
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/// </summary>
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public class ImageFileCache : IDistributedCache
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public sealed class ImageFileCache : IDistributedCache, IDisposable
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{
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private static readonly byte[] expirationTag = Encoding.ASCII.GetBytes("EXPIRES:");
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private readonly MemoryDistributedCache memoryCache = new MemoryDistributedCache(Options.Create(new MemoryDistributedCacheOptions()));
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private readonly string rootPath;
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private readonly DirectoryInfo rootDirectory;
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private readonly Timer cleanTimer;
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private bool cleaning;
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public ImageFileCache(string path)
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: this(path, TimeSpan.FromHours(1))
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{
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}
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public ImageFileCache(string path, TimeSpan autoCleanInterval)
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{
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if (string.IsNullOrEmpty(path))
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{
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throw new ArgumentException($"The {nameof(path)} argument must not be null or empty.", nameof(path));
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}
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rootPath = path;
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rootDirectory = new DirectoryInfo(path);
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Debug.WriteLine($"{nameof(ImageFileCache)}: {rootPath}");
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Debug.WriteLine($"{nameof(ImageFileCache)}: {rootDirectory.FullName}");
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ThreadPool.QueueUserWorkItem(o => Clean());
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if (autoCleanInterval > TimeSpan.Zero)
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{
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cleanTimer = new Timer(_ => Clean(), null, TimeSpan.Zero, autoCleanInterval);
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}
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}
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public void Dispose()
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{
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cleanTimer?.Dispose();
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}
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public byte[] Get(string key)
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@ -45,63 +57,66 @@ namespace MapControl.Caching
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if (buffer == null)
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{
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var path = GetPath(key);
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var file = GetFile(key);
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try
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{
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if (path != null && File.Exists(path))
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if (file != null && file.Exists && file.CreationTime > DateTime.Now)
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{
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buffer = File.ReadAllBytes(path);
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if (CheckExpiration(ref buffer, out DistributedCacheEntryOptions options))
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using (var stream = file.OpenRead())
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{
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memoryCache.Set(key, buffer, options);
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buffer = new byte[stream.Length];
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var offset = 0;
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while (offset < buffer.Length)
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{
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offset += stream.Read(buffer, offset, buffer.Length - offset);
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}
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}
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var options = new DistributedCacheEntryOptions { AbsoluteExpiration = file.CreationTime };
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memoryCache.Set(key, buffer, options);
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}
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}
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catch (Exception ex)
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{
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Debug.WriteLine($"{nameof(ImageFileCache)}: Failed reading {path}: {ex.Message}");
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Debug.WriteLine($"{nameof(ImageFileCache)}: Failed reading {file.FullName}: {ex.Message}");
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}
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}
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return buffer;
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}
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public async Task<byte[]> GetAsync(string key, CancellationToken cancellationToken = default)
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public async Task<byte[]> GetAsync(string key, CancellationToken token = default)
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{
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var buffer = await memoryCache.GetAsync(key, cancellationToken).ConfigureAwait(false);
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var buffer = await memoryCache.GetAsync(key, token).ConfigureAwait(false);
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if (buffer == null)
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{
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var path = GetPath(key);
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var file = GetFile(key);
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try
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{
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if (path != null && File.Exists(path) && !cancellationToken.IsCancellationRequested)
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if (file != null && file.Exists && file.CreationTime > DateTime.Now)
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{
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#if NETFRAMEWORK
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using (var stream = File.OpenRead(path))
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using (var stream = file.OpenRead())
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{
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buffer = new byte[stream.Length];
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var offset = 0;
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while (offset < buffer.Length)
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{
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offset += await stream.ReadAsync(buffer, offset, buffer.Length - offset, cancellationToken).ConfigureAwait(false);
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offset += await stream.ReadAsync(buffer, offset, buffer.Length - offset, token).ConfigureAwait(false);
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}
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}
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#else
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buffer = await File.ReadAllBytesAsync(path, cancellationToken).ConfigureAwait(false);
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#endif
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if (CheckExpiration(ref buffer, out DistributedCacheEntryOptions options))
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{
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await memoryCache.SetAsync(key, buffer, options, cancellationToken).ConfigureAwait(false);
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}
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var options = new DistributedCacheEntryOptions { AbsoluteExpiration = file.CreationTime };
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await memoryCache.SetAsync(key, buffer, options, token).ConfigureAwait(false);
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}
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}
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catch (Exception ex)
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{
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Debug.WriteLine($"{nameof(ImageFileCache)}: Failed reading {path}: {ex.Message}");
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Debug.WriteLine($"{nameof(ImageFileCache)}: Failed reading {file.FullName}: {ex.Message}");
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}
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}
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@ -112,61 +127,43 @@ namespace MapControl.Caching
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{
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memoryCache.Set(key, buffer, options);
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var path = GetPath(key);
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if (path != null && buffer?.Length > 0)
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{
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try
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{
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Directory.CreateDirectory(Path.GetDirectoryName(path));
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using (var stream = File.Create(path))
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{
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stream.Write(buffer, 0, buffer.Length);
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if (GetExpirationBytes(options, out byte[] expiration))
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{
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stream.Write(expiration, 0, expiration.Length);
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}
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}
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SetAccessControl(path);
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}
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catch (Exception ex)
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{
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Debug.WriteLine($"{nameof(ImageFileCache)}: Failed writing {path}: {ex.Message}");
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}
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}
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}
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public async Task SetAsync(string key, byte[] buffer, DistributedCacheEntryOptions options, CancellationToken cancellationToken = default)
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{
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await memoryCache.SetAsync(key, buffer, options, cancellationToken).ConfigureAwait(false);
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var path = GetPath(key);
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var file = GetFile(key);
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try
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{
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if (path != null && buffer?.Length > 0 && !cancellationToken.IsCancellationRequested)
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if (file != null && buffer?.Length > 0)
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{
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Directory.CreateDirectory(Path.GetDirectoryName(path));
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using (var stream = File.Create(path))
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using (var stream = CreateFile(file, options))
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{
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await stream.WriteAsync(buffer, 0, buffer.Length, cancellationToken).ConfigureAwait(false);
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if (GetExpirationBytes(options, out byte[] expiration))
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{
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await stream.WriteAsync(expiration, 0, expiration.Length, cancellationToken).ConfigureAwait(false);
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}
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stream.Write(buffer, 0, buffer.Length);
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}
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SetAccessControl(path);
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}
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}
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catch (Exception ex)
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{
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Debug.WriteLine($"{nameof(ImageFileCache)}: Failed writing {path}: {ex.Message}");
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Debug.WriteLine($"{nameof(ImageFileCache)}: Failed writing {file.FullName}: {ex.Message}");
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}
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}
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public async Task SetAsync(string key, byte[] buffer, DistributedCacheEntryOptions options, CancellationToken token = default)
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{
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await memoryCache.SetAsync(key, buffer, options, token).ConfigureAwait(false);
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var file = GetFile(key);
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try
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{
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if (file != null && buffer?.Length > 0 && !token.IsCancellationRequested)
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{
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using (var stream = CreateFile(file, options))
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{
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await stream.WriteAsync(buffer, 0, buffer.Length, token).ConfigureAwait(false);
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}
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}
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}
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catch (Exception ex)
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{
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Debug.WriteLine($"{nameof(ImageFileCache)}: Failed writing {file.FullName}: {ex.Message}");
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}
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}
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@ -184,47 +181,57 @@ namespace MapControl.Caching
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{
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memoryCache.Remove(key);
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var path = GetPath(key);
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var file = GetFile(key);
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try
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{
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if (path != null && File.Exists(path))
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if (file != null && file.Exists)
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{
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File.Delete(path);
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file.Delete();
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}
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}
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catch (Exception ex)
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{
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Debug.WriteLine($"{nameof(ImageFileCache)}: Failed deleting {path}: {ex.Message}");
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Debug.WriteLine($"{nameof(ImageFileCache)}: Failed deleting {file.FullName}: {ex.Message}");
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}
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}
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public async Task RemoveAsync(string key, CancellationToken cancellationToken = default)
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public async Task RemoveAsync(string key, CancellationToken token = default)
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{
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await memoryCache.RemoveAsync(key, cancellationToken);
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await memoryCache.RemoveAsync(key, token);
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var path = GetPath(key);
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var file = GetFile(key);
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try
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{
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if (path != null && File.Exists(path) && !cancellationToken.IsCancellationRequested)
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if (file != null && file.Exists && !token.IsCancellationRequested)
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{
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File.Delete(path);
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file.Delete();
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}
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}
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catch (Exception ex)
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{
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Debug.WriteLine($"{nameof(ImageFileCache)}: Failed deleting {path}: {ex.Message}");
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Debug.WriteLine($"{nameof(ImageFileCache)}: Failed deleting {file.FullName}: {ex.Message}");
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}
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}
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public void Clean()
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{
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var deletedFileCount = CleanDirectory(new DirectoryInfo(rootPath));
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if (deletedFileCount > 0)
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if (!cleaning)
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{
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Debug.WriteLine($"{nameof(ImageFileCache)}: Deleted {deletedFileCount} expired files.");
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cleaning = true;
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foreach (var directory in rootDirectory.EnumerateDirectories())
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{
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var deletedFileCount = CleanDirectory(directory);
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if (deletedFileCount > 0)
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{
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Debug.WriteLine($"{nameof(ImageFileCache)}: Deleted {deletedFileCount} expired files in {directory.Name}.");
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}
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}
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cleaning = false;
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}
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}
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@ -233,11 +240,11 @@ namespace MapControl.Caching
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return Task.Run(Clean);
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}
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private string GetPath(string key)
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private FileInfo GetFile(string key)
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{
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try
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{
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return Path.Combine(rootPath, Path.Combine(key.Split('/')));
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return new FileInfo(Path.Combine(rootDirectory.FullName, Path.Combine(key.Split('/'))));
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}
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catch (Exception ex)
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{
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@ -247,15 +254,39 @@ namespace MapControl.Caching
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return null;
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}
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private static FileStream CreateFile(FileInfo file, DistributedCacheEntryOptions options)
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{
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file.Directory.Create();
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var stream = file.Create();
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try
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{
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file.CreationTime = options.AbsoluteExpiration.HasValue
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? options.AbsoluteExpiration.Value.LocalDateTime
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: DateTime.Now.Add(options.AbsoluteExpirationRelativeToNow ?? (options.SlidingExpiration ?? TimeSpan.FromDays(1)));
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}
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catch (Exception ex)
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{
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Debug.WriteLine($"{nameof(ImageFileCache)}: Failed setting creation time of {file.FullName}: {ex.Message}");
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}
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return stream;
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}
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private static int CleanDirectory(DirectoryInfo directory)
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{
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var deletedFileCount = 0;
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try
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{
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deletedFileCount += directory.EnumerateDirectories().Sum(dir => CleanDirectory(dir));
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deletedFileCount = directory.EnumerateDirectories().Sum(CleanDirectory);
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deletedFileCount += directory.EnumerateFiles().Sum(file => CleanFile(file));
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foreach (var file in directory.EnumerateFiles().Where(f => f.CreationTime <= DateTime.Now))
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{
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file.Delete();
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deletedFileCount++;
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}
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if (!directory.EnumerateFileSystemInfos().Any())
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{
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@ -269,120 +300,5 @@ namespace MapControl.Caching
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return deletedFileCount;
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}
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private static int CleanFile(FileInfo file)
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{
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var deletedFileCount = 0;
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if (file.Length > 16)
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{
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try
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{
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var hasExpired = false;
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using (var stream = file.OpenRead())
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{
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stream.Seek(-16, SeekOrigin.End);
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var buffer = new byte[16];
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hasExpired = stream.Read(buffer, 0, 16) == 16
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&& GetExpirationTicks(buffer, out long expiration)
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&& expiration <= DateTimeOffset.UtcNow.Ticks;
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}
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if (hasExpired)
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{
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file.Delete();
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deletedFileCount = 1;
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}
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}
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catch (Exception ex)
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{
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Debug.WriteLine($"{nameof(ImageFileCache)}: Failed cleaning {file.FullName}: {ex.Message}");
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}
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}
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return deletedFileCount;
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}
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private static bool CheckExpiration(ref byte[] buffer, out DistributedCacheEntryOptions options)
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{
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if (GetExpirationTicks(buffer, out long expiration))
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{
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if (expiration > DateTimeOffset.UtcNow.Ticks)
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{
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Array.Resize(ref buffer, buffer.Length - 16);
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options = new DistributedCacheEntryOptions
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{
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AbsoluteExpiration = new DateTimeOffset(expiration, TimeSpan.Zero)
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};
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return true;
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}
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buffer = null; // buffer has expired
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}
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options = null;
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return false;
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}
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private static bool GetExpirationTicks(byte[] buffer, out long expirationTicks)
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{
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if (buffer.Length >= 16 &&
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expirationTag.SequenceEqual(buffer.Skip(buffer.Length - 16).Take(8)))
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{
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expirationTicks = BitConverter.ToInt64(buffer, buffer.Length - 8);
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return true;
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}
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expirationTicks = 0;
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return false;
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}
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private static bool GetExpirationBytes(DistributedCacheEntryOptions options, out byte[] expirationBytes)
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{
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long expirationTicks;
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if (options.AbsoluteExpiration.HasValue)
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{
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expirationTicks = options.AbsoluteExpiration.Value.Ticks;
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}
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else if (options.AbsoluteExpirationRelativeToNow.HasValue)
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{
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expirationTicks = DateTimeOffset.UtcNow.Add(options.AbsoluteExpirationRelativeToNow.Value).Ticks;
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}
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else if (options.SlidingExpiration.HasValue)
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{
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expirationTicks = DateTimeOffset.UtcNow.Add(options.SlidingExpiration.Value).Ticks;
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}
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else
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{
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expirationBytes = null;
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return false;
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}
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expirationBytes = expirationTag.Concat(BitConverter.GetBytes(expirationTicks)).ToArray();
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return true;
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}
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private static void SetAccessControl(string path)
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{
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#if AVALONIA
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if (!OperatingSystem.IsWindows()) return;
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#endif
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var fileInfo = new FileInfo(path);
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var fileSecurity = fileInfo.GetAccessControl();
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var fullControlRule = new System.Security.AccessControl.FileSystemAccessRule(
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new System.Security.Principal.SecurityIdentifier(
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System.Security.Principal.WellKnownSidType.BuiltinUsersSid, null),
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System.Security.AccessControl.FileSystemRights.FullControl,
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System.Security.AccessControl.AccessControlType.Allow);
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fileSecurity.AddAccessRule(fullControlRule);
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fileInfo.SetAccessControl(fileSecurity);
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}
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}
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}
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|
|
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@ -7,34 +7,45 @@ using Microsoft.Extensions.Caching.Memory;
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using Microsoft.Extensions.Options;
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using System;
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using System.Diagnostics;
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using System.IO;
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using System.Linq;
|
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using System.Runtime.InteropServices.WindowsRuntime;
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using System.Text;
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using System.Threading;
|
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using System.Threading.Tasks;
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using Windows.Storage;
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using Windows.Storage.Streams;
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using Buffer = Windows.Storage.Streams.Buffer;
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|
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namespace MapControl.Caching
|
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{
|
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/// <summary>
|
||||
/// IDistributedCache implementation based on local image files.
|
||||
/// </summary>
|
||||
public partial class ImageFileCache : IDistributedCache
|
||||
public sealed class ImageFileCache : IDistributedCache, IDisposable
|
||||
{
|
||||
private static readonly byte[] expirationTag = Encoding.ASCII.GetBytes("EXPIRES:");
|
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|
||||
private readonly MemoryDistributedCache memoryCache = new MemoryDistributedCache(Options.Create(new MemoryDistributedCacheOptions()));
|
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private readonly StorageFolder rootFolder;
|
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private readonly Timer cleanTimer;
|
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private bool cleaning;
|
||||
|
||||
public ImageFileCache(StorageFolder folder)
|
||||
: this(folder, TimeSpan.FromHours(1))
|
||||
{
|
||||
}
|
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|
||||
public ImageFileCache(StorageFolder folder, TimeSpan autoCleanInterval)
|
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{
|
||||
rootFolder = folder ?? throw new ArgumentException($"The {nameof(folder)} argument must not be null or empty.", nameof(folder));
|
||||
|
||||
Debug.WriteLine($"{nameof(ImageFileCache)}: {rootFolder.Path}");
|
||||
|
||||
_ = Task.Factory.StartNew(CleanAsync, TaskCreationOptions.LongRunning);
|
||||
if (autoCleanInterval > TimeSpan.Zero)
|
||||
{
|
||||
cleanTimer = new Timer(_ => CleanAsync().Wait(), null, TimeSpan.Zero, autoCleanInterval);
|
||||
}
|
||||
}
|
||||
|
||||
public void Dispose()
|
||||
{
|
||||
cleanTimer?.Dispose();
|
||||
}
|
||||
|
||||
public byte[] Get(string key)
|
||||
|
|
@ -46,7 +57,7 @@ namespace MapControl.Caching
|
|||
{
|
||||
throw new NotSupportedException();
|
||||
}
|
||||
|
||||
|
||||
public void Remove(string key)
|
||||
{
|
||||
throw new NotSupportedException();
|
||||
|
|
@ -77,14 +88,13 @@ namespace MapControl.Caching
|
|||
{
|
||||
var item = await rootFolder.TryGetItemAsync(key.Replace('/', '\\'));
|
||||
|
||||
if (item is StorageFile file)
|
||||
if (item is StorageFile file && file.DateCreated > DateTimeOffset.Now)
|
||||
{
|
||||
buffer = (await FileIO.ReadBufferAsync(file)).ToArray();
|
||||
|
||||
if (CheckExpiration(ref buffer, out DistributedCacheEntryOptions options))
|
||||
{
|
||||
await memoryCache.SetAsync(key, buffer, options, token).ConfigureAwait(false);
|
||||
}
|
||||
var options = new DistributedCacheEntryOptions { AbsoluteExpiration = file.DateCreated };
|
||||
|
||||
await memoryCache.SetAsync(key, buffer, options, token).ConfigureAwait(false);
|
||||
}
|
||||
}
|
||||
catch (Exception ex)
|
||||
|
|
@ -114,15 +124,13 @@ namespace MapControl.Caching
|
|||
|
||||
var file = await folder.CreateFileAsync(keyComponents[keyComponents.Length - 1], CreationCollisionOption.OpenIfExists);
|
||||
|
||||
using (var stream = await file.OpenAsync(FileAccessMode.ReadWrite))
|
||||
{
|
||||
await stream.WriteAsync(buffer.AsBuffer());
|
||||
await FileIO.WriteBytesAsync(file, buffer);
|
||||
|
||||
if (GetExpirationBytes(options, out byte[] expiration))
|
||||
{
|
||||
await stream.WriteAsync(expiration.AsBuffer());
|
||||
}
|
||||
}
|
||||
var expiration = options.AbsoluteExpiration.HasValue
|
||||
? options.AbsoluteExpiration.Value.LocalDateTime
|
||||
: DateTime.Now.Add(options.AbsoluteExpirationRelativeToNow ?? (options.SlidingExpiration ?? TimeSpan.FromDays(1)));
|
||||
|
||||
File.SetCreationTime(file.Path, expiration);
|
||||
}
|
||||
catch (Exception ex)
|
||||
{
|
||||
|
|
@ -133,11 +141,21 @@ namespace MapControl.Caching
|
|||
|
||||
public async Task CleanAsync()
|
||||
{
|
||||
var deletedFileCount = await CleanFolder(rootFolder);
|
||||
|
||||
if (deletedFileCount > 0)
|
||||
if (!cleaning)
|
||||
{
|
||||
Debug.WriteLine($"{nameof(ImageFileCache)}: Deleted {deletedFileCount} expired files.");
|
||||
cleaning = true;
|
||||
|
||||
foreach (var folder in await rootFolder.GetFoldersAsync())
|
||||
{
|
||||
var deletedFileCount = await CleanFolder(folder);
|
||||
|
||||
if (deletedFileCount > 0)
|
||||
{
|
||||
Debug.WriteLine($"{nameof(ImageFileCache)}: Deleted {deletedFileCount} expired files in {folder.Name}.");
|
||||
}
|
||||
}
|
||||
|
||||
cleaning = false;
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -147,14 +165,15 @@ namespace MapControl.Caching
|
|||
|
||||
try
|
||||
{
|
||||
foreach (var f in await folder.GetFoldersAsync())
|
||||
foreach (var subFolder in await folder.GetFoldersAsync())
|
||||
{
|
||||
deletedFileCount += await CleanFolder(f);
|
||||
deletedFileCount += await CleanFolder(subFolder);
|
||||
}
|
||||
|
||||
foreach (var f in await folder.GetFilesAsync())
|
||||
foreach (var file in (await folder.GetFilesAsync()).Where(f => f.DateCreated <= DateTime.Now))
|
||||
{
|
||||
deletedFileCount += await CleanFile(f);
|
||||
await file.DeleteAsync();
|
||||
deletedFileCount++;
|
||||
}
|
||||
|
||||
if ((await folder.GetItemsAsync()).Count == 0)
|
||||
|
|
@ -169,104 +188,5 @@ namespace MapControl.Caching
|
|||
|
||||
return deletedFileCount;
|
||||
}
|
||||
|
||||
private static async Task<int> CleanFile(StorageFile file)
|
||||
{
|
||||
var deletedFileCount = 0;
|
||||
var size = (await file.GetBasicPropertiesAsync()).Size;
|
||||
|
||||
if (size > 16)
|
||||
{
|
||||
try
|
||||
{
|
||||
var hasExpired = false;
|
||||
|
||||
using (var stream = await file.OpenReadAsync())
|
||||
{
|
||||
stream.Seek(size - 16);
|
||||
|
||||
var buffer = await stream.ReadAsync(new Buffer(16), 16, InputStreamOptions.None);
|
||||
|
||||
hasExpired = buffer.Length == 16
|
||||
&& GetExpirationTicks(buffer.ToArray(), out long expiration)
|
||||
&& expiration <= DateTimeOffset.UtcNow.Ticks;
|
||||
}
|
||||
|
||||
if (hasExpired)
|
||||
{
|
||||
await file.DeleteAsync();
|
||||
deletedFileCount = 1;
|
||||
}
|
||||
}
|
||||
catch (Exception ex)
|
||||
{
|
||||
Debug.WriteLine($"{nameof(ImageFileCache)}: Failed cleaning {file.Path}: {ex.Message}");
|
||||
}
|
||||
}
|
||||
|
||||
return deletedFileCount;
|
||||
}
|
||||
|
||||
private static bool CheckExpiration(ref byte[] buffer, out DistributedCacheEntryOptions options)
|
||||
{
|
||||
if (GetExpirationTicks(buffer, out long expiration))
|
||||
{
|
||||
if (expiration > DateTimeOffset.UtcNow.Ticks)
|
||||
{
|
||||
Array.Resize(ref buffer, buffer.Length - 16);
|
||||
|
||||
options = new DistributedCacheEntryOptions
|
||||
{
|
||||
AbsoluteExpiration = new DateTimeOffset(expiration, TimeSpan.Zero)
|
||||
};
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
buffer = null; // buffer has expired
|
||||
}
|
||||
|
||||
options = null;
|
||||
return false;
|
||||
}
|
||||
|
||||
private static bool GetExpirationTicks(byte[] buffer, out long expirationTicks)
|
||||
{
|
||||
if (buffer.Length >= 16 &&
|
||||
expirationTag.SequenceEqual(buffer.Skip(buffer.Length - 16).Take(8)))
|
||||
{
|
||||
expirationTicks = BitConverter.ToInt64(buffer, buffer.Length - 8);
|
||||
return true;
|
||||
}
|
||||
|
||||
expirationTicks = 0;
|
||||
return false;
|
||||
}
|
||||
|
||||
private static bool GetExpirationBytes(DistributedCacheEntryOptions options, out byte[] expirationBytes)
|
||||
{
|
||||
long expirationTicks;
|
||||
|
||||
if (options.AbsoluteExpiration.HasValue)
|
||||
{
|
||||
expirationTicks = options.AbsoluteExpiration.Value.Ticks;
|
||||
}
|
||||
else if (options.AbsoluteExpirationRelativeToNow.HasValue)
|
||||
{
|
||||
expirationTicks = DateTimeOffset.UtcNow.Add(options.AbsoluteExpirationRelativeToNow.Value).Ticks;
|
||||
}
|
||||
else if (options.SlidingExpiration.HasValue)
|
||||
{
|
||||
expirationTicks = DateTimeOffset.UtcNow.Add(options.SlidingExpiration.Value).Ticks;
|
||||
}
|
||||
else
|
||||
{
|
||||
expirationBytes = null;
|
||||
return false;
|
||||
}
|
||||
|
||||
expirationBytes = expirationTag.Concat(BitConverter.GetBytes(expirationTicks)).ToArray();
|
||||
return true;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue