public AzureIndexInput(AzureDirectory azuredirectory, ICloudBlob blob) : base(blob.Name)
{
_name = blob.Uri.Segments[blob.Uri.Segments.Length - 1];
_fileMutex = BlobMutexManager.GrabMutex(_name);
_fileMutex.WaitOne();
try
{
_azureDirectory = azuredirectory;
_blobContainer = azuredirectory.BlobContainer;
_blob = blob;
string fileName = _name;
StreamOutput fileStream = _azureDirectory.CreateCachedOutputAsStream(fileName);
// get the blob
_blob.DownloadToStream(fileStream);
fileStream.Flush();
Debug.WriteLine("GET {0} RETREIVED {1} bytes", _name, fileStream.Length);
fileStream.Close();
// and open it as an input
_indexInput = CacheDirectory.openInput(fileName, IOContext.DEFAULT);
}
finally
{
_fileMutex.ReleaseMutex();
}
}
public AzureIndexInput(AzureDirectory azureDirectory, string name, BlobClient blob)
: base(name)
{
this._name = name;
this._azureDirectory = azureDirectory;
#if FULLDEBUG
Debug.WriteLine($"{_azureDirectory.Name} opening {name} ");
#endif
_fileMutex = BlobMutexManager.GrabMutex(name);
_fileMutex.WaitOne();
try
{
_blobContainer = azureDirectory.BlobContainer;
_blob = blob;
bool fileNeeded = false;
if (!CacheDirectory.FileExists(name))
{
fileNeeded = true;
}
else
{
long cachedLength = CacheDirectory.FileLength(name);
var properties = blob.GetProperties();
long blobLength = properties.Value?.ContentLength ?? 0;
if (cachedLength != blobLength)
{
fileNeeded = true;
}
}
// if the file does not exist
// or if it exists and it is older then the lastmodified time in the blobproperties (which always comes from the blob storage)
if (fileNeeded)
{
using (StreamOutput fileStream = _azureDirectory.CreateCachedOutputAsStream(name))
{
// get the blob
_blob.DownloadTo(fileStream);
fileStream.Flush();
Debug.WriteLine($"{_azureDirectory.Name} GET {_name} RETREIVED {fileStream.Length} bytes");
}
}
#if FULLDEBUG
Debug.WriteLine($"{_azureDirectory.Name} Using cached file for {name}");
#endif
// and open it as our input, this is now available forevers until new file comes along
_indexInput = CacheDirectory.OpenInput(name, IOContext.DEFAULT);
}
finally
{
_fileMutex.ReleaseMutex();
}
}
public AzureIndexInput(AzureDirectory azuredirectory, CloudBlob blob)
{
_name = blob.Uri.Segments[blob.Uri.Segments.Length - 1];
#if FULLDEBUG
Debug.WriteLine(String.Format("opening {0} ", _name));
#endif
_fileMutex = BlobMutexManager.GrabMutex(_name);
_fileMutex.WaitOne();
try
{
_azureDirectory = azuredirectory;
_blobContainer = azuredirectory.BlobContainer;
_blob = blob;
string fileName = _name;
bool fFileNeeded = false;
if (!CacheDirectory.FileExists(fileName))
{
fFileNeeded = true;
}
else
{
long cachedLength = CacheDirectory.FileLength(fileName);
long blobLength = blob.Properties.Length;
long.TryParse(blob.Metadata["CachedLength"], out blobLength);
long longLastModified = 0;
DateTime blobLastModifiedUTC = blob.Properties.LastModifiedUtc;
if (long.TryParse(blob.Metadata["CachedLastModified"], out longLastModified))
{
blobLastModifiedUTC = new DateTime(longLastModified).ToUniversalTime();
}
if (cachedLength != blobLength)
{
fFileNeeded = true;
}
else
{
// there seems to be an error of 1 tick which happens every once in a while
// for now we will say that if they are within 1 tick of each other and same length
DateTime cachedLastModifiedUTC = new DateTime(CacheDirectory.FileModified(fileName), DateTimeKind.Local).ToUniversalTime();
if (cachedLastModifiedUTC != blobLastModifiedUTC)
{
TimeSpan timeSpan = blobLastModifiedUTC.Subtract(cachedLastModifiedUTC);
if (timeSpan.TotalSeconds > 1)
{
fFileNeeded = true;
}
else
{
#if FULLDEBUG
Debug.WriteLine(timeSpan.TotalSeconds);
#endif
// file not needed
}
}
}
}
// if the file does not exist
// or if it exists and it is older then the lastmodified time in the blobproperties (which always comes from the blob storage)
if (fFileNeeded)
{
#if COMPRESSBLOBS
if (_azureDirectory.ShouldCompressFile(_name))
{
// then we will get it fresh into local deflatedName
// StreamOutput deflatedStream = new StreamOutput(CacheDirectory.CreateOutput(deflatedName));
MemoryStream deflatedStream = new MemoryStream();
// get the deflated blob
_blob.DownloadToStream(deflatedStream);
Debug.WriteLine(string.Format("GET {0} RETREIVED {1} bytes", _name, deflatedStream.Length));
// seek back to begininng
deflatedStream.Seek(0, SeekOrigin.Begin);
// open output file for uncompressed contents
StreamOutput fileStream = _azureDirectory.CreateCachedOutputAsStream(fileName);
// create decompressor
DeflateStream decompressor = new DeflateStream(deflatedStream, CompressionMode.Decompress);
byte[] bytes = new byte[65535];
int nRead = 0;
do
{
nRead = decompressor.Read(bytes, 0, 65535);
if (nRead > 0)
{
fileStream.Write(bytes, 0, nRead);
}
} while (nRead == 65535);
decompressor.Close(); // this should close the deflatedFileStream too
fileStream.Close();
}
else
#endif
{
StreamOutput fileStream = _azureDirectory.CreateCachedOutputAsStream(fileName);
// get the blob
_blob.DownloadToStream(fileStream);
fileStream.Flush();
Debug.WriteLine(string.Format("GET {0} RETREIVED {1} bytes", _name, fileStream.Length));
fileStream.Close();
}
// and open it as an input
_indexInput = CacheDirectory.OpenInput(fileName);
}
else
{
#if FULLDEBUG
Debug.WriteLine(String.Format("Using cached file for {0}", _name));
#endif
// open the file in read only mode
_indexInput = CacheDirectory.OpenInput(fileName);
}
}
finally
{
_fileMutex.ReleaseMutex();
}
}
