private void CopyCallerHoldsReaderLock(string source, string destination, CopyFlag copyFlag, TimeoutHelper helper)
{
string destinationDirectory = FabricPath.GetDirectoryName(destination);
if (!string.IsNullOrEmpty(destinationDirectory) && !FabricDirectory.Exists(destinationDirectory))
{
FabricDirectory.CreateDirectory(destinationDirectory);
}
using (FileWriterLock writerLock = new FileWriterLock(destination))
{
if (!writerLock.Acquire())
{
throw new FabricTransientException(StringResources.Error_ImageStoreAcquireFileLockFailed, FabricErrorCode.ImageStoreAcquireFileLockFailed);
}
if (helper != null)
{
helper.ThrowIfExpired();
}
if (FabricFile.Exists(source))
{
// This is a file copy
if (FabricFile.Exists(destination))
{
FabricFile.Delete(destination, deleteReadonly: true);
}
int retryCount = 0;
while (helper == null || !TimeoutHelper.HasExpired(helper))
{
try
{
bool shouldOverwrite = (copyFlag != CopyFlag.AtomicCopySkipIfExists);
FabricFile.Copy(source, destination, shouldOverwrite);
break;
}
catch (UnauthorizedAccessException)
{
TraceSource.WriteInfo(
TraceType,
"Uploading {0} to {1} caused UnauthorizedAccessException. RetryCount: {2}.",
source,
destination,
retryCount);
if (retryCount++ > 3)
{
throw;
}
// This could happen when a file is marked for delete and we try to delete
// it again or try to open the file. Retrying after sometime should fix the issue.
Thread.Sleep(TimeSpan.FromSeconds(retryCount));
}
if (helper != null)
{
helper.ThrowIfExpired();
}
}
}
else
{
// This is a folder copy
using (FolderCopy fc = new FolderCopy(copyFlag, null))
{
fc.Copy(source, destination);
}
}
}
}
/// <summary>
/// Remove tag from store and clear the data associated with tag.
/// </summary>
/// <param name="tag">Location (relative to RootUri) from where to delete the content.</param>
/// <param name="timeout">The timeout for performing the delete operation.</param>
public void DeleteContent(string tag, TimeSpan timeout)
{
TimeoutHelper helper = (timeout == TimeSpan.MaxValue) ? null : new TimeoutHelper(timeout);
#if !DotNetCoreClr
using (WindowsImpersonationContext impersonationContext = this.GetImpersonationContext())
#endif
{
try
{
string smbTag = this.ConvertTagToSMBPath(tag);
if ((!FabricFile.Exists(smbTag)) &&
(!FabricDirectory.Exists(smbTag)))
{
return;
}
using (FileWriterLock fileWriterLock = new FileWriterLock(smbTag))
{
if (!fileWriterLock.Acquire())
{
throw new FabricTransientException(StringResources.Error_ImageStoreAcquireFileLockFailed, FabricErrorCode.ImageStoreAcquireFileLockFailed);
}
if (helper != null)
{
helper.ThrowIfExpired();
}
if (FabricFile.Exists(smbTag))
{
FabricFile.Delete(smbTag, deleteReadonly: true);
}
else if (FabricDirectory.Exists(smbTag))
{
FabricDirectory.Delete(smbTag, recursive: true, deleteReadOnlyFiles: true);
}
}
}
catch (IOException exception)
{
// HResult 0x80070020: THE PROCESS CANNOT ACCESS THE FILE BECAUSE IT IS BEING USED BY ANOTHER PROCESS
// This work-around is done here since when we read a file from a folder we only take a reader lock on the file and not the
// entire folder. When we delete a folder, we only take writer lock on the folder and hence we might run into scenarios
// where a folder is attempted to be deleted even when a file in it is being read.
// Returning FabricImageStoreException, causes CM to retry the delete operation.
int hrError = Marshal.GetHRForException(exception);
TraceSource.WriteWarning(
TraceType,
"Delete of {0} failed because of {1}, hrError {2:X}.",
tag,
exception.Message,
hrError);
if (hrError == unchecked ((int)0x80070020))
{
throw new FabricTransientException(StringResources.Error_ImageStoreAcquireFileLockFailed, exception, FabricErrorCode.ImageStoreAcquireFileLockFailed);
}
throw;
}
}
}