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Python Examples


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(Python) AWS S3 File Streaming Upload

Demonstrates how to do a streaming upload from a file to the AWS S3 storage service. The AWS authorization presents some difficulties when the REST request body is to be streamed from a file (or from some other source). The issue is that the SHA-256 hash of the file data must be calculated. There are only two possible ways to do this: (1) stream the file into memory in its entirety and calculate the SHA-256 hash prior to uploading, or (2) pre-calculate the SHA-256 in a streaming fashion, and then provide it to the AWS authentication object.

If the application does NOT pre-compute the SHA-256, then Chilkat (internally) is forced to stream into memory, calculate the SHA-256, and then upload from the in-memory copy of the file.

Chilkat Python Downloads

Python Module for Windows, Linux, MAC OS X,
Solaris, FreeBSD, and ARM Embedded Linux

import sys
import chilkat

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

#  This first part is optional.  AWS authentication requires
#  the SHA-256 hash of the request body (i.e. the contents of the file
#  to be uploaded).  We can choose to pre-calculate the SHA-256 in a streaming fashion
#  and then provide it to the authenticator object.  This way, if the file is
#  extremely large, it never needs to completely reside in memory.
crypt = chilkat.CkCrypt2()
crypt.put_EncodingMode("hex")
crypt.put_HashAlgorithm("sha-256")
fileToUploadPath = "qa_data/xml/hamlet.xml"
hashStr = crypt.hashFileENC(fileToUploadPath)

rest = chilkat.CkRest()

#  Connect to the Amazon AWS REST server.
bTls = True
port = 443
bAutoReconnect = True
success = rest.Connect("s3.amazonaws.com",port,bTls,bAutoReconnect)

#  ----------------------------------------------------------------------------
#  Important: For buckets created in regions outside us-east-1,
#  there are three important changes that need to be made.
#  See Working with S3 Buckets in Non-us-east-1 Regions for the details.
#  ----------------------------------------------------------------------------

#  Provide AWS credentials for the REST call.
authAws = chilkat.CkAuthAws()
authAws.put_AccessKey("AWS_ACCESS_KEY")
authAws.put_SecretKey("AWS_SECRET_KEY")
authAws.put_ServiceName("s3")
#  Provide the pre-computed SHA-256 here:
authAws.put_PrecomputedSha256(hashStr)

success = rest.SetAuthAws(authAws)

#  Set the bucket name via the HOST header.
#  In this case, the bucket name is "chilkat100".
rest.put_Host("chilkat100.s3.amazonaws.com")

fileStream = chilkat.CkStream()
fileStream.put_SourceFile(fileToUploadPath)

#  Upload to the S3 Storage service.
#  If the application provided the SHA-256 hash of the file contents (as shown above)
#  then file is streamed and never has to completely reside in memory.
#  If the application did NOT provide the SHA-256, then Chilkat will (internally)
#  load the entire file into memory, calculate the SHA-256, and then upload.
responseStr = rest.fullRequestStream("PUT","/hamlet.xml",fileStream)
if (rest.get_LastMethodSuccess() != True):
    print(rest.lastErrorText())
    sys.exit()

#  When successful, the S3 Storage service will respond with a 200 response code,
#  with an XML body.
if (rest.get_ResponseStatusCode() == 200):
    print(responseStr)
    print("File uploaded.")
else:
    #  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("response body: " + responseStr)
    print("---")
    print("LastRequestStartLine: " + rest.lastRequestStartLine())
    print("LastRequestHeader: " + rest.lastRequestHeader())


 

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