CkPython

Streaming Download Large File to the Local Filesystem

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Downloads a large file in a streaming fashion to the local filesystem. CkPython

import sys
import chilkat

success = False

# Azure File Service Example: Downloads a large file to the local filesystem using a Chilkat stream.
# See:  https://docs.microsoft.com/en-us/rest/api/storageservices/get-file

# 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.file.core.windows.net",port,bTls,bAutoReconnect)
if (success != True):
    print(rest.lastErrorText())
    sys.exit()

# Provide Azure Cloud credentials for the REST calls.
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("File")
# 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: x-ms-date, Authorization.  These headers
# are automatically set by Chilkat.

# When streaming a download to the local filesystem or directed elsewhere,
# the complete HTTP GET operation must be broken into parts.
# For example, an HTTP GET consists of sending the request, followed by reading the response header,
# and then finally the response body.  We'll want to read the response header, and then based
# on the information received (such as success or failure), either read the response body
# as an error message, or as the file data.

# Send the HTTP GET request to download the file.
# The share is named "pip".
success = rest.SendReqNoBody("GET","/pip/somethingBig.zip")
if (success != True):
    print(rest.lastErrorText())
    sys.exit()

# Read the response header.
responseStatusCode = rest.ReadResponseHeader()
if (responseStatusCode < 0):
    print(rest.lastErrorText())
    sys.exit()

print("Response status code = " + str(responseStatusCode))

# We expect a 200 response status if the file data is coming.
# Otherwise, we'll get a string response body with an error message(or no response body).
if (responseStatusCode == 200):

    bodyStream = chilkat.CkStream()

    # The stream's sink will be a file.
    bodyStream.put_SinkFile("qa_output/somethingBig.zip")

    # Read the response body to the stream.  Given that we've
    # set the stream's sink to a file, it will stream directly
    # to the file.
    success = rest.ReadRespBodyStream(bodyStream,True)
    if (success != True):
        print(rest.lastErrorText())
        sys.exit()

    print("Successfully received the large file.")

else:
    errResponse = rest.readRespBodyString()
    if (rest.get_LastMethodSuccess() != True):
        print(rest.lastErrorText())
    else:
        print(errResponse)