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Visual FoxPro Examples

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(Visual FoxPro) S3 Complete a Multipart Upload

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>

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

LOCAL loXmlInit
LOCAL lnSuccess
LOCAL lcUploadId
LOCAL loXmlPartsList
LOCAL loRest
LOCAL lnBTls
LOCAL lnPort
LOCAL lnBAutoReconnect
LOCAL loAuthAws
LOCAL lcResponseXml
LOCAL loXml

*  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.

loXmlInit = CreateObject('Chilkat_9_5_0.Xml')
lnSuccess = loXmlInit.LoadXmlFile("s3_multipart_uploads/initiate.xml")
IF (lnSuccess <> 1) THEN
    ? "Did not find the initiate.xml XML file."
    RELEASE loXmlInit
    CANCEL
ENDIF

lcUploadId = loXmlInit.GetChildContent("UploadId")
? "UploadId = " + lcUploadId

*  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.)
loXmlPartsList = CreateObject('Chilkat_9_5_0.Xml')
lnSuccess = loXmlPartsList.LoadXmlFile("s3_multipart_uploads/partsList.xml")
IF (lnSuccess <> 1) THEN
    ? "Did not find the partsList.xml XML file."
    RELEASE loXmlInit
    RELEASE loXmlPartsList
    CANCEL
ENDIF

loRest = CreateObject('Chilkat_9_5_0.Rest')

*  Connect to the Amazon AWS REST server.
lnBTls = 1
lnPort = 443
lnBAutoReconnect = 1
lnSuccess = loRest.Connect("s3.amazonaws.com",lnPort,lnBTls,lnBAutoReconnect)

*  ----------------------------------------------------------------------------
*  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.
loAuthAws = CreateObject('Chilkat_9_5_0.AuthAws')
loAuthAws.AccessKey = "AWS_ACCESS_KEY"
loAuthAws.SecretKey = "AWS_SECRET_KEY"
loAuthAws.ServiceName = "s3"

lnSuccess = loRest.SetAuthAws(loAuthAws)

*  Set the bucket name via the HOST header.
*  In this case, the bucket name is "chilkat100".
loRest.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:
loRest.AddQueryParam("uploadId",lcUploadId)

*  Our ObjectName in this case is "somethingBig.zip".
lcResponseXml = loRest.FullRequestString("POST","/somethingBig.zip",loXmlPartsList.GetXml())
IF (loRest.LastMethodSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loXmlInit
    RELEASE loXmlPartsList
    RELEASE loRest
    RELEASE loAuthAws
    CANCEL
ENDIF

*  When successful, the S3 Storage service will respond with a 200 response code,
*  with an XML body.
IF (loRest.ResponseStatusCode <> 200) THEN
    *  Examine the request/response to see what happened.
    ? "response status code = " + STR(loRest.ResponseStatusCode)
    ? "response status text = " + loRest.ResponseStatusText
    ? "response header: " + loRest.ResponseHeader
    ? "response body: " + lcResponseXml
    ? "---"
    ? "LastRequestStartLine: " + loRest.LastRequestStartLine
    ? "LastRequestHeader: " + loRest.LastRequestHeader
ENDIF

*  Load the XML response into Chilkat XMl and emit via GetXml to see the XML in a pretty-printed (indented) readable format.
loXml = CreateObject('Chilkat_9_5_0.Xml')
loXml.LoadXml(lcResponseXml)
? loXml.GetXml()
? "----"

? "Multipart upload completed."

RELEASE loXmlInit
RELEASE loXmlPartsList
RELEASE loRest
RELEASE loAuthAws
RELEASE loXml


 

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