PowerBuilder

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>

PowerBuilder

integer li_rc
long li_Success
oleobject loo_XmlInit
string ls_UploadId
oleobject loo_XmlPartsList
oleobject loo_Rest
long li_BTls
long li_Port
long li_BAutoReconnect
oleobject loo_AuthAws
string ls_ResponseXml
oleobject loo_Xml

li_Success = 0

//  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.

loo_XmlInit = create oleobject
li_rc = loo_XmlInit.ConnectToNewObject("Chilkat.Xml")
if li_rc < 0 then
    destroy loo_XmlInit
    MessageBox("Error","Connecting to COM object failed")
    return
end if
li_Success = loo_XmlInit.LoadXmlFile("s3_multipart_uploads/initiate.xml")
if li_Success <> 1 then
    Write-Debug "Did not find the initiate.xml XML file."
    destroy loo_XmlInit
    return
end if

ls_UploadId = loo_XmlInit.GetChildContent("UploadId")
Write-Debug "UploadId = " + ls_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.)
loo_XmlPartsList = create oleobject
li_rc = loo_XmlPartsList.ConnectToNewObject("Chilkat.Xml")

li_Success = loo_XmlPartsList.LoadXmlFile("s3_multipart_uploads/partsList.xml")
if li_Success <> 1 then
    Write-Debug "Did not find the partsList.xml XML file."
    destroy loo_XmlInit
    destroy loo_XmlPartsList
    return
end if

loo_Rest = create oleobject
li_rc = loo_Rest.ConnectToNewObject("Chilkat.Rest")

//  Connect to the Amazon AWS REST server.
li_BTls = 1
li_Port = 443
li_BAutoReconnect = 1
li_Success = loo_Rest.Connect("s3.amazonaws.com",li_Port,li_BTls,li_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.
loo_AuthAws = create oleobject
li_rc = loo_AuthAws.ConnectToNewObject("Chilkat.AuthAws")

loo_AuthAws.AccessKey = "AWS_ACCESS_KEY"
loo_AuthAws.SecretKey = "AWS_SECRET_KEY"
loo_AuthAws.ServiceName = "s3"

li_Success = loo_Rest.SetAuthAws(loo_AuthAws)

//  Set the bucket name via the HOST header.
//  In this case, the bucket name is "chilkat100".
loo_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:
loo_Rest.AddQueryParam("uploadId",ls_UploadId)

//  Our ObjectName in this case is "somethingBig.zip".
ls_ResponseXml = loo_Rest.FullRequestString("POST","/somethingBig.zip",loo_XmlPartsList.GetXml())
if loo_Rest.LastMethodSuccess <> 1 then
    Write-Debug loo_Rest.LastErrorText
    destroy loo_XmlInit
    destroy loo_XmlPartsList
    destroy loo_Rest
    destroy loo_AuthAws
    return
end if

//  When successful, the S3 Storage service will respond with a 200 response code,
//  with an XML body.  
if loo_Rest.ResponseStatusCode <> 200 then
    //  Examine the request/response to see what happened.
    Write-Debug "response status code = " + string(loo_Rest.ResponseStatusCode)
    Write-Debug "response status text = " + loo_Rest.ResponseStatusText
    Write-Debug "response header: " + loo_Rest.ResponseHeader
    Write-Debug "response body: " + ls_ResponseXml
    Write-Debug "---"
    Write-Debug "LastRequestStartLine: " + loo_Rest.LastRequestStartLine
    Write-Debug "LastRequestHeader: " + loo_Rest.LastRequestHeader
end if

//  Load the XML response into Chilkat XMl and emit via GetXml to see the XML in a pretty-printed (indented) readable format.
loo_Xml = create oleobject
li_rc = loo_Xml.ConnectToNewObject("Chilkat.Xml")

loo_Xml.LoadXml(ls_ResponseXml)
Write-Debug loo_Xml.GetXml()
Write-Debug "----"

Write-Debug "Multipart upload completed."


destroy loo_XmlInit
destroy loo_XmlPartsList
destroy loo_Rest
destroy loo_AuthAws
destroy loo_Xml