private void InflateStream(string fileName) { // then we will get it fresh into local deflatedName // StreamOutput deflatedStream = new StreamOutput(CacheDirectory.CreateOutput(deflatedName)); using (var 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 using (var fileStream = _azureDirectory.CreateCachedOutputAsStream(fileName)) using (var decompressor = new DeflateStream(deflatedStream, CompressionMode.Decompress)) { var bytes = new byte[65535]; var nRead = 0; do { nRead = decompressor.Read(bytes, 0, 65535); if (nRead > 0) { fileStream.Write(bytes, 0, nRead); } } while (nRead == 65535); } } }
public AzureIndexInput(AzureDirectory azuredirectory, ICloudBlob blob) { if (azuredirectory == null) { throw new ArgumentNullException(nameof(azuredirectory)); } _name = blob.Uri.Segments[blob.Uri.Segments.Length - 1]; _azureDirectory = azuredirectory; #if FULLDEBUG Debug.WriteLine(String.Format("opening {0} ", _name)); #endif _fileMutex = SyncMutexManager.GrabMutex(_azureDirectory, _name); _fileMutex.WaitOne(); try { _blobContainer = azuredirectory.BlobContainer; _blob = blob; var fileName = _name; var fFileNeeded = false; if (!CacheDirectory.FileExists(fileName)) { fFileNeeded = true; } else { long cachedLength = CacheDirectory.FileLength(fileName); string blobLengthMetadata; bool hasMetadataValue = blob.Metadata.TryGetValue("CachedLength", out blobLengthMetadata); long blobLength = blob.Properties.Length; if (hasMetadataValue) { long.TryParse(blobLengthMetadata, out blobLength); } string blobLastModifiedMetadata; long longLastModified = 0; DateTime blobLastModifiedUTC = blob.Properties.LastModified.Value.UtcDateTime; if (blob.Metadata.TryGetValue("CachedLastModified", out blobLastModifiedMetadata)) { if (long.TryParse(blobLastModifiedMetadata, out longLastModified)) { blobLastModifiedUTC = new DateTime(longLastModified).ToUniversalTime(); } } if (cachedLength != blobLength) { fFileNeeded = true; } else { // cachedLastModifiedUTC was not ouputting with a date (just time) and the time was always off long unixDate = CacheDirectory.FileModified(fileName); DateTime start = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc); var cachedLastModifiedUTC = start.AddMilliseconds(unixDate).ToUniversalTime(); if (cachedLastModifiedUTC != blobLastModifiedUTC) { var 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 (_azureDirectory.ShouldCompressFile(_name)) { InflateStream(fileName); } else { using (var fileStream = _azureDirectory.CreateCachedOutputAsStream(fileName)) { // get the blob _blob.DownloadToStream(fileStream); fileStream.Flush(); Debug.WriteLine(string.Format("GET {0} RETREIVED {1} bytes", _name, fileStream.Length)); } } // 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(); } }