|
public static CreateSignatureForLocalFile ( string localFilePath ) : |
||
| localFilePath | string | |
| return | ||
// updates blob if possible.
// if blob doesn't already exist OR does not have a signature file
// then we just upload as usual.
public long UploadFile(string containerName, string blobName, string localFilePath)
{
var fileLength = CommonOps.GetFileSize(localFilePath);
// not used here but is cached for later.
// WORK IN PROGRESS DONT ERASE THIS LINE.
//ConfigHelper.GetSignatureSize(fileLength, true);
// 1) Does remote blob exist?
// 2) if so, download existing signature for blob.
if (AzureHelper.DoesBlobExist(containerName, blobName) && AzureHelper.DoesBlobSignatureExist(containerName, blobName))
{
// 3) If blob exists and have signature, then let the magic begin.
// 3.1) Download existing blob signature from Azure.
// 3.2) Search through local file for matches in existing blob signature.
// 3.3) Upload differences to Azure
// 3.4) Upload new signature.s
var blobSig = DownloadSignatureForBlob(containerName, blobName);
var searchResults = CommonOps.SearchLocalFileForSignatures(localFilePath, blobSig);
var allBlocks = UploadDelta(localFilePath, searchResults, containerName, blobName);
var sig = CommonOps.CreateSignatureFromNewAndReusedBlocks(allBlocks);
UploadSignatureForBlob(blobName, containerName, sig);
long bytesUploaded = allBlocks.Where(b => b.IsNew).Select(b => b.Size).Sum();
return(bytesUploaded);
}
else
{
// 4) If blob or signature does NOT exist, just upload as normal. No tricky stuff to do here.
// 4.1) Generate signature and upload it.
var remainingBytes = new RemainingBytes()
{
BeginOffset = 0,
EndOffset = fileLength - 1
};
var allUploadedBlocks = UploadBytesParallel(remainingBytes, localFilePath, containerName, blobName);
// var allUploadedBlocks = UploadBytes(remainingBytes, localFilePath, containerName, blobName);
var res = (from b in allUploadedBlocks orderby b.Offset ascending select b.BlockId);
PutBlockList(res.ToArray(), containerName, blobName);
var sig = CommonOps.CreateSignatureForLocalFile(localFilePath);
UploadSignatureForBlob(blobName, containerName, sig);
return(fileLength);
}
}
public long DownloadBlob(string containerName, string blobName, string localFilePath, int parallelFactor = 2)
{
long bytesDownloaded = 0;
if (CommonOps.DoesFileExist(localFilePath))
{
// local file exists.
// 1) generate sig for local file.
// 2) download sig for blob.
var blobSig = DownloadSignatureForBlob(containerName, blobName);
var localSig = CommonOps.CreateSignatureForLocalFile(localFilePath);
var searchResults = CommonOps.SearchLocalFileForSignatures(localFilePath, blobSig);
// we now have a list of which blocks are already in the local file (searchResults.SignaturesToReuse)
// We need to then determine the byteranges which are NOT covered by these blocks
// and download those.
// Then we need to get the blocks that already exist in the local file, read those then write them to the new file.
var byteRangesToDownload = GenerateByteRangesOfBlobToDownload(searchResults.SignaturesToReuse, blobSig,
containerName, blobName);
RegenerateBlob(containerName, blobName, byteRangesToDownload, localFilePath, searchResults.SignaturesToReuse, blobSig, parallelFactor);
foreach (var byteRange in byteRangesToDownload)
{
bytesDownloaded += byteRange.EndOffset - byteRange.BeginOffset;
}
}
else
{
// download fresh copy.
// get stream to store.
using (var stream = CommonHelper.GetStream(localFilePath))
{
bytesDownloaded = DownloadBlob(containerName, blobName, stream, parallelFactor);
}
}
return(bytesDownloaded);
}
// updates blob if possible.
// if blob doesn't already exist OR does not have a signature file
// then we just upload as usual.
public long UploadFile(string containerName, string blobName, string localFilePath, int parallelFactor = 2)
{
var fileLength = CommonOps.GetFileSize(localFilePath);
var sw = new Stopwatch();
sw.Start();
var md5ForFile = GetFileMD5(localFilePath);
// 1) Does remote blob exist?
// 2) if so, download existing signature for blob.
if (AzureHelper.DoesBlobExist(containerName, blobName) && AzureHelper.DoesBlobSignatureExist(containerName, blobName))
{
var md5ForBlob = GetBlobMD5(containerName, blobName);
// only continue if files are actually different.
if (md5ForBlob != md5ForFile)
{
// 3) If blob exists and have signature, then let the magic begin.
// 3.1) Download existing blob signature from Azure.
// 3.2) Search through local file for matches in existing blob signature.
// 3.3) Upload differences to Azure
// 3.4) Upload new signature.s
var blobSig = DownloadSignatureForBlob(containerName, blobName);
Console.WriteLine(string.Format("Dowloaded sig {0}ms", sw.ElapsedMilliseconds));
var searchResults = CommonOps.SearchLocalFileForSignatures(localFilePath, blobSig);
Console.WriteLine(string.Format("Searched for common {0}ms", sw.ElapsedMilliseconds));
var allBlocks = UploadDelta(localFilePath, searchResults, containerName, blobName, parallelFactor: parallelFactor);
var sig = CommonOps.CreateSignatureFromNewAndReusedBlocks(allBlocks);
UploadSignatureForBlob(blobName, containerName, sig);
// set md5 for entire blob
AzureHelper.SetBlobMD5(containerName, blobName, md5ForFile);
long bytesUploaded = allBlocks.Where(b => b.IsNew).Select(b => b.Size).Sum();
return(bytesUploaded);
}
return(0); // no bytes changed, no bytes uploaded
}
else
{
// 4) If blob or signature does NOT exist, just upload as normal. No tricky stuff to do here.
// 4.1) Generate signature and upload it.
var remainingBytes = new RemainingBytes()
{
BeginOffset = 0,
EndOffset = fileLength - 1
};
var allUploadedBlocks = UploadBytesParallel(remainingBytes, localFilePath, containerName, blobName, parallelFactor: parallelFactor);
var res = (from b in allUploadedBlocks orderby b.Offset ascending select b.BlockId);
PutBlockList(res.ToArray(), containerName, blobName);
var sig = CommonOps.CreateSignatureForLocalFile(localFilePath);
UploadSignatureForBlob(blobName, containerName, sig);
// set md5 for entire blob
AzureHelper.SetBlobMD5(containerName, blobName, md5ForFile);
return(fileLength);
}
}
