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Upload File in Blocks (with Content-MD5 header) and Commit the Block List
See more Azure Cloud Storage Examples
Demonstrates how to upload a file in blocks and then commit the block list. This example includes a Content-MD5 header for each block.Chilkat Go Downloads
success := false
// Azure Blob Service Example: Upload a file in blocks, and then commit the block list.
// See also: https://msdn.microsoft.com/en-us/library/azure/dd135726.aspx
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
rest := chilkat.NewRest()
// Connect to the Azure Storage Blob Service
bTls := true
port := 443
bAutoReconnect := true
// In this example, the storage account name is "chilkat".
success = rest.Connect("chilkat.blob.core.windows.net",port,bTls,bAutoReconnect)
if success != true {
fmt.Println(rest.LastErrorText())
rest.DisposeRest()
return
}
// Provide Azure Cloud credentials for the REST call.
azAuth := chilkat.NewAuthAzureStorage()
azAuth.SetAccessKey("AZURE_ACCESS_KEY")
// The account name used here should match the 1st part of the domain passed in the call to Connect (above).
azAuth.SetAccount("chilkat")
azAuth.SetScheme("SharedKey")
azAuth.SetService("Blob")
// This causes the "x-ms-version: 2021-08-06" header to be automatically added.
azAuth.SetXMsVersion("2021-08-06")
success = rest.SetAuthAzureStorage(azAuth)
// Note: The application does not need to explicitly set the following
// headers: Content-Length, x-ms-date, Authorization. These headers
// are automatically set by Chilkat.
// As the blocks are uploaded, we'll keep an XML block list for the subsequent commit..
xml := chilkat.NewXml()
xml.SetTag("BlockList")
// Any type of file can be uploaded in this way. It can a text file, binary file, anything...
// This example will upload an XML file that is approximately 275K in size. It can be downloaded
// at http://www.chilkatsoft.com/hamlet.xml
fac := chilkat.NewFileAccess()
success = fac.OpenForRead("qa_data/xml/hamlet.xml")
// Assuming success for the example..
// We'll upload in 16K blocks (normally a program would upload in larger block sizes than this,
// but this is just an example...)
blockSize := 16384
// How many 16K blocks? (Including 1 for the last partial block)
numBlocks := fac.GetNumBlocks(blockSize)
crypt := chilkat.NewCrypt2()
crypt.SetHashAlgorithm("md5")
sbResponseBody := chilkat.NewStringBuilder()
uriPath := chilkat.NewStringBuilder()
var blockId *string = new(string)
dataBlock := chilkat.NewBinData()
var contentMd5 *string = new(string)
i := 0
for i < numBlocks {
dataBlock.Clear()
success = fac.ReadBlockBd(i,blockSize,dataBlock)
if success == false {
fmt.Println(fac.LastErrorText())
rest.DisposeRest()
azAuth.DisposeAuthAzureStorage()
xml.DisposeXml()
fac.DisposeFileAccess()
crypt.DisposeCrypt2()
sbResponseBody.DisposeStringBuilder()
uriPath.DisposeStringBuilder()
dataBlock.DisposeBinData()
return
}
// Generate a base64 block ID.
// (Chilkat provides a helper method named GenBlockId to make this easy)
// A pre-base64 encoded block ID length of 4 is sufficient in this case because
// this file certainly won't have more than 99,999 blocks..
blockId = fac.GenBlockId(i,4,"base64")
// Add this blockId to the list of blocks to be committed.
xml.NewChild2("Latest",*blockId)
// Build the URI path
uriPath.Clear()
success = uriPath.Append("/mycontainer/hamlet.xml?comp=block&blockId=")
success = uriPath.Append(*blockId)
contentMd5 = crypt.HashBdENC(dataBlock)
rest.AddHeader("Content-MD5",*contentMd5)
// Upload this block..
sbResponseBody.Clear()
success = rest.FullRequestBd("PUT",*uriPath.GetAsString(),dataBlock,sbResponseBody)
if success == false {
fmt.Println(rest.LastErrorText())
rest.DisposeRest()
azAuth.DisposeAuthAzureStorage()
xml.DisposeXml()
fac.DisposeFileAccess()
crypt.DisposeCrypt2()
sbResponseBody.DisposeStringBuilder()
uriPath.DisposeStringBuilder()
dataBlock.DisposeBinData()
return
}
// Verify that we received a 201 status code.
if rest.ResponseStatusCode() != 201 {
// Examine the request/response to see what happened.
fmt.Println("response status code = ", rest.ResponseStatusCode())
fmt.Println("response status text = ", rest.ResponseStatusText())
fmt.Println("response header: ", rest.ResponseHeader())
fmt.Println("response body (if any): ", *sbResponseBody.GetAsString())
fmt.Println("---")
fmt.Println("LastRequestStartLine: ", rest.LastRequestStartLine())
fmt.Println("LastRequestHeader: ", rest.LastRequestHeader())
rest.DisposeRest()
azAuth.DisposeAuthAzureStorage()
xml.DisposeXml()
fac.DisposeFileAccess()
crypt.DisposeCrypt2()
sbResponseBody.DisposeStringBuilder()
uriPath.DisposeStringBuilder()
dataBlock.DisposeBinData()
return
}
i = i + 1
}
fac.FileClose()
// Now commit the blocks.
// Let's have a look at the XML that will commit the blocks:
xmlStr := xml.GetXml()
fmt.Println(*xmlStr)
// The XML will look like this:
// <?xml version="1.0" encoding="utf-8" ?>
// <BlockList>
// <Latest>MDAwMA==</Latest>
// <Latest>MDAwMQ==</Latest>
// <Latest>MDAwMg==</Latest>
// <Latest>MDAwMw==</Latest>
// <Latest>MDAwNA==</Latest>
// <Latest>MDAwNQ==</Latest>
// <Latest>MDAwNg==</Latest>
// <Latest>MDAwNw==</Latest>
// <Latest>MDAwOA==</Latest>
// <Latest>MDAwOQ==</Latest>
// <Latest>MDAxMA==</Latest>
// <Latest>MDAxMQ==</Latest>
// <Latest>MDAxMg==</Latest>
// <Latest>MDAxMw==</Latest>
// <Latest>MDAxNA==</Latest>
// <Latest>MDAxNQ==</Latest>
// <Latest>MDAxNg==</Latest>
// <Latest>MDAxNw==</Latest>
// </BlockList>
// --------------------------------------------------------------------------
// IMPORTANT: Remove the Content-MD5 header previously set in the loop above.
// --------------------------------------------------------------------------
rest.RemoveHeader("Content-MD5")
// Send the PUT Block List...
responseStr := rest.FullRequestString("PUT","/mycontainer/hamlet.xml?comp=blocklist",*xmlStr)
if rest.LastMethodSuccess() != true {
fmt.Println(rest.LastErrorText())
rest.DisposeRest()
azAuth.DisposeAuthAzureStorage()
xml.DisposeXml()
fac.DisposeFileAccess()
crypt.DisposeCrypt2()
sbResponseBody.DisposeStringBuilder()
uriPath.DisposeStringBuilder()
dataBlock.DisposeBinData()
return
}
// When successful, the Azure Storage service will respond with a 201 response status code,
// with no response body.
if rest.ResponseStatusCode() != 201 {
// Examine the request/response to see what happened.
fmt.Println("response status code = ", rest.ResponseStatusCode())
fmt.Println("response status text = ", rest.ResponseStatusText())
fmt.Println("response header: ", rest.ResponseHeader())
fmt.Println("response body (if any): ", *responseStr)
fmt.Println("---")
fmt.Println("LastRequestStartLine: ", rest.LastRequestStartLine())
fmt.Println("LastRequestHeader: ", rest.LastRequestHeader())
rest.DisposeRest()
azAuth.DisposeAuthAzureStorage()
xml.DisposeXml()
fac.DisposeFileAccess()
crypt.DisposeCrypt2()
sbResponseBody.DisposeStringBuilder()
uriPath.DisposeStringBuilder()
dataBlock.DisposeBinData()
return
}
fmt.Println("Success.")
rest.DisposeRest()
azAuth.DisposeAuthAzureStorage()
xml.DisposeXml()
fac.DisposeFileAccess()
crypt.DisposeCrypt2()
sbResponseBody.DisposeStringBuilder()
uriPath.DisposeStringBuilder()
dataBlock.DisposeBinData()