Chilkat2-Python

S3 Complete a Multipart Upload

See more Amazon S3 (new) Examples

This operation completes a multipart upload by assembling previously uploaded parts.

Processing of a Complete Multipart Upload request could take several minutes to complete. After Amazon S3 begins processing the request, it sends an HTTP response header that specifies a 200 OK response. While processing is in progress, Amazon S3 periodically sends whitespace characters to keep the connection from timing out. Because a request could fail after the initial 200 OK response has been sent, it is important that you check the response body to determine whether the request succeeded.

This example sends a POST request to complete a multipart upload, which looks like this:

POST /ObjectName?uploadId=UploadId HTTP/1.1
Host: BucketName.s3.amazonaws.com
Date: Date
Content-Length: Size
Authorization: authorization string

<CompleteMultipartUpload>
  <Part>
    <PartNumber>PartNumber</PartNumber>
    <ETag>ETag</ETag>
  </Part>
  ...
</CompleteMultipartUpload>

Chilkat2-Python

import sys
import chilkat2

success = False

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

# The 1st step in an S3 multipart upload is to initiate it,
# as shown here: Initiate S3 Multipart Upload

# The 2nd step is to upload the parts
# as shown here: S3 Upload Parts

# The 3rd and final step (this example) is to complete the multipart upload.

# Other S3 Multipart Upload Examples:
# Abort Multipart Upload
# List Parts

# When the multipart upload was initiated, an UploadId was provided in the XML response, and it 
# was saved to a file.  Steps 2 and 3 begin by loading the XML and getting
# the Upload ID.

xmlInit = chilkat2.Xml()
success = xmlInit.LoadXmlFile("s3_multipart_uploads/initiate.xml")
if (success != True):
    print("Did not find the initiate.xml XML file.")
    sys.exit()

uploadId = xmlInit.GetChildContent("UploadId")
print("UploadId = " + uploadId)

# We'll also need the XML file that contains a record of the parts
# with part numbers and ETags.  (This file was produced when parts were being uploaded.)
xmlPartsList = chilkat2.Xml()
success = xmlPartsList.LoadXmlFile("s3_multipart_uploads/partsList.xml")
if (success != True):
    print("Did not find the partsList.xml XML file.")
    sys.exit()

rest = chilkat2.Rest()

# 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 = chilkat2.AuthAws()
authAws.AccessKey = "AWS_ACCESS_KEY"
authAws.SecretKey = "AWS_SECRET_KEY"
authAws.ServiceName = "s3"

success = rest.SetAuthAws(authAws)

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

# The "uploadId=UploadId" must be added as a query parameter.  This allows it to be 
# incorporated into the AWS signature calculation, which is a requirement.
# Therefore, we use AddQueryParam:
rest.AddQueryParam("uploadId",uploadId)

# Our ObjectName in this case is "somethingBig.zip".
responseXml = rest.FullRequestString("POST","/somethingBig.zip",xmlPartsList.GetXml())
if (rest.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.ResponseStatusCode != 200):
    # Examine the request/response to see what happened.
    print("response status code = " + str(rest.ResponseStatusCode))
    print("response status text = " + rest.ResponseStatusText)
    print("response header: " + rest.ResponseHeader)
    print("response body: " + responseXml)
    print("---")
    print("LastRequestStartLine: " + rest.LastRequestStartLine)
    print("LastRequestHeader: " + rest.LastRequestHeader)

# Load the XML response into Chilkat XMl and emit via GetXml to see the XML in a pretty-printed (indented) readable format.
xml = chilkat2.Xml()
xml.LoadXml(responseXml)
print(xml.GetXml())
print("----")

print("Multipart upload completed.")