Xbase++

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>

Xbase++

LOCAL nSuccess
LOCAL oXmlInit
LOCAL cUploadId
LOCAL oXmlPartsList
LOCAL oRest
LOCAL nBTls
LOCAL nPort
LOCAL nBAutoReconnect
LOCAL oAuthAws
LOCAL cResponseXml
LOCAL oXml

nSuccess := 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.

oXmlInit := CreateObject("Chilkat.Xml")
nSuccess := oXmlInit:LoadXmlFile("s3_multipart_uploads/initiate.xml")
IF (nSuccess != 1)
    ? "Did not find the initiate.xml XML file."
    oXmlInit:destroy()
    RETURN
ENDIF

cUploadId := oXmlInit:GetChildContent("UploadId")
? "UploadId = " + cUploadId

//  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.)
oXmlPartsList := CreateObject("Chilkat.Xml")
nSuccess := oXmlPartsList:LoadXmlFile("s3_multipart_uploads/partsList.xml")
IF (nSuccess != 1)
    ? "Did not find the partsList.xml XML file."
    oXmlInit:destroy()
    oXmlPartsList:destroy()
    RETURN
ENDIF

oRest := CreateObject("Chilkat.Rest")

//  Connect to the Amazon AWS REST server.
nBTls := 1
nPort := 443
nBAutoReconnect := 1
nSuccess := oRest:Connect("s3.amazonaws.com", nPort, nBTls, nBAutoReconnect)

//  ----------------------------------------------------------------------------
//  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.
oAuthAws := CreateObject("Chilkat.AuthAws")
oAuthAws:AccessKey := "AWS_ACCESS_KEY"
oAuthAws:SecretKey := "AWS_SECRET_KEY"
oAuthAws:ServiceName := "s3"

nSuccess := oRest:SetAuthAws(oAuthAws)

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

//  Our ObjectName in this case is "somethingBig.zip".
cResponseXml := oRest:FullRequestString("POST", "/somethingBig.zip", oXmlPartsList:GetXml())
IF (oRest:LastMethodSuccess != 1)
    ? oRest:LastErrorText
    oXmlInit:destroy()
    oXmlPartsList:destroy()
    oRest:destroy()
    oAuthAws:destroy()
    RETURN
ENDIF

//  When successful, the S3 Storage service will respond with a 200 response code,
//  with an XML body.  
IF (oRest:ResponseStatusCode != 200)
    //  Examine the request/response to see what happened.
    ? "response status code = " + Str(oRest:ResponseStatusCode)
    ? "response status text = " + oRest:ResponseStatusText
    ? "response header: " + oRest:ResponseHeader
    ? "response body: " + cResponseXml
    ? "---"
    ? "LastRequestStartLine: " + oRest:LastRequestStartLine
    ? "LastRequestHeader: " + oRest:LastRequestHeader
ENDIF

//  Load the XML response into Chilkat XMl and emit via GetXml to see the XML in a pretty-printed (indented) readable format.
oXml := CreateObject("Chilkat.Xml")
oXml:LoadXml(cResponseXml)
? oXml:GetXml()
? "----"

? "Multipart upload completed."

oXmlInit:destroy()
oXmlPartsList:destroy()
oRest:destroy()
oAuthAws:destroy()
oXml:destroy()