public void DownloadRangeToStream(Stream stream, long offset, int length)
{
Require.NotNull("stream", stream);
Require.ZeroOrGreater("offset", offset);
Require.Positive("length", length);
try {
_blob.DownloadRangeToStream(stream, offset, length);
}
catch (StorageException ex) {
// if forbidden, then we might have an expired SAS token
if (ex.RequestInformation != null && ex.RequestInformation.HttpStatusCode == 403)
{
throw new ForbiddenException("Can't read blob", ex);
}
throw;
}
}
public void DownloadRangeToStream(Stream stream, long offset, int length)
{
Require.NotNull("stream", stream);
Require.ZeroOrGreater("offset", offset);
Require.Positive("length", length);
try {
var context = new OperationContext();
context.SendingRequest += (sender, e) => {
e.Request.Headers["if-match"] = "*";
};
_blob.DownloadRangeToStream(stream, offset, length, null, null, context);
}
catch (StorageException ex) {
// if forbidden, then we might have an expired SAS token
if (ex.RequestInformation != null && ex.RequestInformation.HttpStatusCode == 403)
{
throw new ForbiddenException("Can't read blob", ex);
}
throw;
}
}
private static void Download(string accountName, string accountKey, string containerName, string blobName, string localFilePath, int segmentSize, int delayBeetweenChunksInSeconds)
{
var cloudStorageAccount = CloudStorageAccount.Parse("DefaultEndpointsProtocol=https;AccountName=" + accountName + ";AccountKey=" + accountKey);
var blobContainer = cloudStorageAccount.CreateCloudBlobClient().GetContainerReference(containerName);
CloudPageBlob blob = blobContainer.GetPageBlobReference(blobName);
blob.FetchAttributes();
long startPosition = 0;
if (File.Exists(localFilePath))
{
log.AddLine("Local file exists. Resuming download...");
using (FileStream fs = new FileStream(localFilePath, FileMode.Open))
{
fs.Seek(0, SeekOrigin.End);
startPosition = fs.Position;
}
}
long blobLength = blob.Properties.Length;
var blobLengthRemaining = blobLength - startPosition;
DateTime momentBeforeRead = DateTime.Now;
double percentDone = 0;
TimeSpan timeForOneRead = new TimeSpan(0);
double speedBytesPerSecond = 0;
TimeSpan timeRemaining = new TimeSpan(0);
int secondsRemaining = 0;
timeoutTimer = new Timer(Timer_Tick, null, Timeout.Infinite, Timeout.Infinite);
while (blobLengthRemaining > 0)
{
long blockSize = Math.Min(segmentSize, blobLengthRemaining);
byte[] blobContents = new byte[blockSize];
using (MemoryStream ms = new MemoryStream())
{
timeoutTimer.Change(new TimeSpan(0, 0, 10), new TimeSpan(0, 0, 10));
blob.DownloadRangeToStream(ms, startPosition, blockSize);
timeoutTimer.Change(Timeout.Infinite, Timeout.Infinite);
ms.Position = 0;
ms.Read(blobContents, 0, blobContents.Length);
using (FileStream fs = new FileStream(localFilePath, FileMode.OpenOrCreate))
{
fs.Position = startPosition;
fs.Write(blobContents, 0, blobContents.Length);
}
}
startPosition += blockSize;
blobLengthRemaining -= blockSize;
//blobLength:100=startPosition:x
percentDone = startPosition * 100 / blobLength;
timeForOneRead = DateTime.Now.Subtract(momentBeforeRead);
momentBeforeRead = DateTime.Now;
speedBytesPerSecond = blockSize / timeForOneRead.TotalSeconds;
secondsRemaining = (int)Math.Round(blobLengthRemaining / speedBytesPerSecond);
timeRemaining = new TimeSpan(0, 0, secondsRemaining);
Console.SetCursorPosition(0, 19);
Console.WriteLine(" ");
Console.SetCursorPosition(0, 19);
log.AddLine(string.Format("{0}%, {1}/{2} bytes, {3} kbytes/sec, remaining (dd:hh:mm:ss): {4}:{5}:{6}:{7}",
percentDone,
startPosition,
blobLength,
Math.Round(speedBytesPerSecond / 1024, 2),
timeRemaining.Days,
timeRemaining.Hours,
timeRemaining.Minutes,
timeRemaining.Seconds
)
);
attempt = 1;
if (delayBeetweenChunksInSeconds > 0)
{
Thread.Sleep(delayBeetweenChunksInSeconds);
}
}
}
