CkPython

Azure Blob - Get Tags (Check if Blob Exists)

See more Azure Cloud Storage Examples

Gets the user-defined tags for a specified blob. This can also be used as a way to check to see if a blob exists. CkPython

import sys
import chilkat

success = False

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

rest = chilkat.CkRest()

# 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):
    print(rest.lastErrorText())
    sys.exit()

# Provide Azure Cloud credentials for the REST call.
azAuth = chilkat.CkAuthAzureStorage()
azAuth.put_AccessKey("AZURE_ACCESS_KEY")
# The account name used here should match the 1st part of the domain passed in the call to Connect (above).
azAuth.put_Account("chilkat")
azAuth.put_Scheme("SharedKey")
azAuth.put_Service("Blob")
# This causes the "x-ms-version: 2021-08-06" header to be automatically added.
azAuth.put_XMsVersion("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.

# The Azure blob container is "test", the file is "helloWorld.txt"
# Add "?comp=tags" to get the user-defined tags instead of the actual blob content.
sb = chilkat.CkStringBuilder()
success = rest.FullRequestNoBodySb("GET","/test/helloWorldajdfadf.txt?comp=tags",sb)
if (success == False):
    # Examine the request/response to see what happened.
    print("response status code = " + str(rest.get_ResponseStatusCode()))
    print("response status text = " + rest.responseStatusText())
    print("response header: " + rest.responseHeader())
    print("---")
    print("LastRequestStartLine: " + rest.lastRequestStartLine())
    print("LastRequestHeader: " + rest.lastRequestHeader())
    sys.exit()

# A typical blob with no tags will return this:

# <?xml version="1.0" encoding="utf-8"?>
# <Tags><TagSet/></Tags>

# If the blob does not exist, you get this:

# <?xml version="1.0" encoding="utf-8"?>
# <Error>
#     <Code>BlobNotFound</Code>
#     <Message>The specified blob does not exist.
# 	RequestId:fcfefdd9-301e-001a-2135-3a23d2000000
# 	Time:2023-02-06T14:17:00.7805577Z
#     </Message>
# </Error>

print(sb.getAsString())

# To see if we got Tags or an Error, then examine the XML.
xml = chilkat.CkXml()
xml.LoadSb(sb,True)

# Examine the tag..
if (xml.TagEquals("Tags") == True):
    print("Blob exists!")
else:

    if (xml.ChildContentMatches("Code","BlobNotFound",True) == True):
        print("Blob does not exist.")
    else:
        print("Some other error...")

print("Success.")