private byte[] TryGetFromFileSystemCache(string path, DateTime remoteLastModified)
{
byte[] data = null;
var fileLastModified = DateTime.MinValue;
var tempFilePath = AzurePathHelper.GetTempBlobPath(path);
if (System.IO.File.Exists(tempFilePath))
{
fileLastModified = System.IO.File.GetLastWriteTimeUtc(tempFilePath);
using (var stream = new System.IO.FileStream(tempFilePath, System.IO.FileMode.Open))
{
data = new byte[stream.Length];
stream.Read(data, 0, data.Length);
}
}
// no data in cache or outdated
if (data == null || fileLastModified < remoteLastModified)
{
if (data != null)
{
Discard(path);
}
return(null);
}
return(data);
}
private void End_Execute(object sender, EventArgs e)
{
// remove azure temp folder
var tempFolder = AzurePathHelper.GetTempBlobPath(string.Empty);
if (!string.IsNullOrEmpty(tempFolder) && System.IO.Directory.Exists(tempFolder))
{
System.IO.Directory.Delete(tempFolder, true);
}
}
private void AddToFileSystem(string path, byte[] data, DateTime created)
{
var tempFilePath = AzurePathHelper.GetTempBlobPath(path);
System.IO.Directory.CreateDirectory(System.IO.Path.GetDirectoryName(tempFilePath));
using (var stream = new System.IO.FileStream(tempFilePath, System.IO.FileMode.Create))
{
stream.Write(data, 0, data.Length);
}
// make sure the last write time matches cloud timestamp
System.IO.File.SetLastWriteTimeUtc(tempFilePath, created);
}
public void Discard(string path)
{
switch (_cacheType)
{
case BlobCacheType.Memory:
CacheHelper.TouchKey(BlobCacheHelper.GetCacheDependency(path));
break;
case BlobCacheType.FileSystem:
var tempFilePath = AzurePathHelper.GetTempBlobPath(path);
if (System.IO.File.Exists(tempFilePath))
{
System.IO.File.Delete(tempFilePath);
}
break;
}
}
public string Execute(TaskInfo task)
{
if (_blobCacheService.CacheType != BlobCacheType.FileSystem)
{
return("Caching of Azure data is disabled or is set to memory. No need to run this task.");
}
var blobCacheService = Service <IBlobCacheService> .Entry();
var minutes = AccountInfo.Instance.BlobCacheMinutes;
var dateThreshold = DateTime.UtcNow.AddMinutes(-minutes);
var blobsToDelete = BlobCollection.Instance.GetOutdatedBlobPaths(dateThreshold);
var blobsDeleted = 0;
var directoriesUninitialized = 0;
foreach (var path in blobsToDelete)
{
// remove the blob
blobCacheService.Discard(path);
blobsDeleted++;
}
// clear empty folders in file system
if (blobsDeleted > 0)
{
var folders = System.IO.Directory.GetDirectories(AzurePathHelper.GetTempBlobPath(string.Empty), "*", System.IO.SearchOption.AllDirectories).OrderByDescending(p => p.Length);
foreach (var subFolder in folders)
{
if (System.IO.Directory.Exists(subFolder) &&
!System.IO.Directory.GetFiles(subFolder).Any() &&
!System.IO.Directory.EnumerateDirectories(subFolder).Any())
{
System.IO.Directory.Delete(subFolder, false);
}
}
}
return("OK, discarded metadata of " + blobsDeleted + " blobs, " + directoriesUninitialized + " dirs");
}
public void RemovesCachedFile()
{
_blobCacheService.SetCacheType(BlobCacheType.FileSystem);
using (var ms = new System.IO.MemoryStream(System.Text.Encoding.UTF8.GetBytes("string")))
{
Get("RemovesCachedFile.txt").Upload(ms);
}
var cachePath = AzurePathHelper.GetTempBlobPath(Get("RemovesCachedFile.txt").Path);
// cache was created in file system
Assert.IsTrue(System.IO.File.Exists(cachePath));
Get("RemovesCachedFile.txt").Delete();
// cache was removed
Assert.IsFalse(System.IO.File.Exists(cachePath));
Assert.AreEqual(3, _cloudBlobService.History.Count);
}
public bool IsCached(string path)
{
var tempFilePath = AzurePathHelper.GetTempBlobPath(path);
return(System.IO.File.Exists(tempFilePath));
}