Tcl
Tcl
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 Tcl Downloads
load ./chilkat.dll
set success 0
# 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.
set rest [new_CkRest]
# Connect to the Azure Storage Blob Service
set bTls 1
set port 443
set bAutoReconnect 1
# In this example, the storage account name is "chilkat".
set success [CkRest_Connect $rest "chilkat.blob.core.windows.net" $port $bTls $bAutoReconnect]
if {$success != 1} then {
puts [CkRest_lastErrorText $rest]
delete_CkRest $rest
exit
}
# Provide Azure Cloud credentials for the REST call.
set azAuth [new_CkAuthAzureStorage]
CkAuthAzureStorage_put_AccessKey $azAuth "AZURE_ACCESS_KEY"
# The account name used here should match the 1st part of the domain passed in the call to Connect (above).
CkAuthAzureStorage_put_Account $azAuth "chilkat"
CkAuthAzureStorage_put_Scheme $azAuth "SharedKey"
CkAuthAzureStorage_put_Service $azAuth "Blob"
# This causes the "x-ms-version: 2021-08-06" header to be automatically added.
CkAuthAzureStorage_put_XMsVersion $azAuth "2021-08-06"
set success [CkRest_SetAuthAzureStorage $rest $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..
set xml [new_CkXml]
CkXml_put_Tag $xml "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
set fac [new_CkFileAccess]
set success [CkFileAccess_OpenForRead $fac "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...)
set blockSize 16384
# How many 16K blocks? (Including 1 for the last partial block)
set numBlocks [CkFileAccess_GetNumBlocks $fac $blockSize]
set crypt [new_CkCrypt2]
CkCrypt2_put_HashAlgorithm $crypt "md5"
set sbResponseBody [new_CkStringBuilder]
set uriPath [new_CkStringBuilder]
set dataBlock [new_CkBinData]
set i 0
while {$i < $numBlocks} {
CkBinData_Clear $dataBlock
set success [CkFileAccess_ReadBlockBd $fac $i $blockSize $dataBlock]
if {$success == 0} then {
puts [CkFileAccess_lastErrorText $fac]
delete_CkRest $rest
delete_CkAuthAzureStorage $azAuth
delete_CkXml $xml
delete_CkFileAccess $fac
delete_CkCrypt2 $crypt
delete_CkStringBuilder $sbResponseBody
delete_CkStringBuilder $uriPath
delete_CkBinData $dataBlock
exit
}
# 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..
set blockId [CkFileAccess_genBlockId $fac $i 4 "base64"]
# Add this blockId to the list of blocks to be committed.
CkXml_NewChild2 $xml "Latest" $blockId
# Build the URI path
CkStringBuilder_Clear $uriPath
set success [CkStringBuilder_Append $uriPath "/mycontainer/hamlet.xml?comp=block&blockId="]
set success [CkStringBuilder_Append $uriPath $blockId]
set contentMd5 [CkCrypt2_hashBdENC $crypt $dataBlock]
CkRest_AddHeader $rest "Content-MD5" $contentMd5
# Upload this block..
CkStringBuilder_Clear $sbResponseBody
set success [CkRest_FullRequestBd $rest "PUT" [CkStringBuilder_getAsString $uriPath] $dataBlock $sbResponseBody]
if {$success == 0} then {
puts [CkRest_lastErrorText $rest]
delete_CkRest $rest
delete_CkAuthAzureStorage $azAuth
delete_CkXml $xml
delete_CkFileAccess $fac
delete_CkCrypt2 $crypt
delete_CkStringBuilder $sbResponseBody
delete_CkStringBuilder $uriPath
delete_CkBinData $dataBlock
exit
}
# Verify that we received a 201 status code.
if {[CkRest_get_ResponseStatusCode $rest] != 201} then {
# Examine the request/response to see what happened.
puts "response status code = [CkRest_get_ResponseStatusCode $rest]"
puts "response status text = [CkRest_responseStatusText $rest]"
puts "response header: [CkRest_responseHeader $rest]"
puts "response body (if any): [CkStringBuilder_getAsString $sbResponseBody]"
puts "---"
puts "LastRequestStartLine: [CkRest_lastRequestStartLine $rest]"
puts "LastRequestHeader: [CkRest_lastRequestHeader $rest]"
delete_CkRest $rest
delete_CkAuthAzureStorage $azAuth
delete_CkXml $xml
delete_CkFileAccess $fac
delete_CkCrypt2 $crypt
delete_CkStringBuilder $sbResponseBody
delete_CkStringBuilder $uriPath
delete_CkBinData $dataBlock
exit
}
set i [expr $i + 1]
}
CkFileAccess_FileClose $fac
# Now commit the blocks.
# Let's have a look at the XML that will commit the blocks:
set xmlStr [CkXml_getXml $xml]
puts "$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.
# --------------------------------------------------------------------------
CkRest_RemoveHeader $rest "Content-MD5"
# Send the PUT Block List...
set responseStr [CkRest_fullRequestString $rest "PUT" "/mycontainer/hamlet.xml?comp=blocklist" $xmlStr]
if {[CkRest_get_LastMethodSuccess $rest] != 1} then {
puts [CkRest_lastErrorText $rest]
delete_CkRest $rest
delete_CkAuthAzureStorage $azAuth
delete_CkXml $xml
delete_CkFileAccess $fac
delete_CkCrypt2 $crypt
delete_CkStringBuilder $sbResponseBody
delete_CkStringBuilder $uriPath
delete_CkBinData $dataBlock
exit
}
# When successful, the Azure Storage service will respond with a 201 response status code,
# with no response body.
if {[CkRest_get_ResponseStatusCode $rest] != 201} then {
# Examine the request/response to see what happened.
puts "response status code = [CkRest_get_ResponseStatusCode $rest]"
puts "response status text = [CkRest_responseStatusText $rest]"
puts "response header: [CkRest_responseHeader $rest]"
puts "response body (if any): $responseStr"
puts "---"
puts "LastRequestStartLine: [CkRest_lastRequestStartLine $rest]"
puts "LastRequestHeader: [CkRest_lastRequestHeader $rest]"
delete_CkRest $rest
delete_CkAuthAzureStorage $azAuth
delete_CkXml $xml
delete_CkFileAccess $fac
delete_CkCrypt2 $crypt
delete_CkStringBuilder $sbResponseBody
delete_CkStringBuilder $uriPath
delete_CkBinData $dataBlock
exit
}
puts "Success."
delete_CkRest $rest
delete_CkAuthAzureStorage $azAuth
delete_CkXml $xml
delete_CkFileAccess $fac
delete_CkCrypt2 $crypt
delete_CkStringBuilder $sbResponseBody
delete_CkStringBuilder $uriPath
delete_CkBinData $dataBlock