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(PureBasic) 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>
IncludeFile "CkXml.pb" IncludeFile "CkRest.pb" IncludeFile "CkAuthAws.pb" Procedure ChilkatExample() ; 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.i = CkXml::ckCreate() If xmlInit.i = 0 Debug "Failed to create object." ProcedureReturn EndIf success.i = CkXml::ckLoadXmlFile(xmlInit,"s3_multipart_uploads/initiate.xml") If success <> 1 Debug "Did not find the initiate.xml XML file." CkXml::ckDispose(xmlInit) ProcedureReturn EndIf uploadId.s = CkXml::ckGetChildContent(xmlInit,"UploadId") Debug "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.i = CkXml::ckCreate() If xmlPartsList.i = 0 Debug "Failed to create object." ProcedureReturn EndIf success = CkXml::ckLoadXmlFile(xmlPartsList,"s3_multipart_uploads/partsList.xml") If success <> 1 Debug "Did not find the partsList.xml XML file." CkXml::ckDispose(xmlInit) CkXml::ckDispose(xmlPartsList) ProcedureReturn EndIf rest.i = CkRest::ckCreate() If rest.i = 0 Debug "Failed to create object." ProcedureReturn EndIf ; Connect to the Amazon AWS REST server. bTls.i = 1 port.i = 443 bAutoReconnect.i = 1 success = CkRest::ckConnect(rest,"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.i = CkAuthAws::ckCreate() If authAws.i = 0 Debug "Failed to create object." ProcedureReturn EndIf CkAuthAws::setCkAccessKey(authAws, "AWS_ACCESS_KEY") CkAuthAws::setCkSecretKey(authAws, "AWS_SECRET_KEY") CkAuthAws::setCkServiceName(authAws, "s3") success = CkRest::ckSetAuthAws(rest,authAws) ; Set the bucket name via the HOST header. ; In this case, the bucket name is "chilkat100". CkRest::setCkHost(rest, "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: CkRest::ckAddQueryParam(rest,"uploadId",uploadId) ; Our ObjectName in this case is "somethingBig.zip". responseXml.s = CkRest::ckFullRequestString(rest,"POST","/somethingBig.zip",CkXml::ckGetXml(xmlPartsList)) If CkRest::ckLastMethodSuccess(rest) <> 1 Debug CkRest::ckLastErrorText(rest) CkXml::ckDispose(xmlInit) CkXml::ckDispose(xmlPartsList) CkRest::ckDispose(rest) CkAuthAws::ckDispose(authAws) ProcedureReturn EndIf ; When successful, the S3 Storage service will respond with a 200 response code, ; with an XML body. If CkRest::ckResponseStatusCode(rest) <> 200 ; Examine the request/response to see what happened. Debug "response status code = " + Str(CkRest::ckResponseStatusCode(rest)) Debug "response status text = " + CkRest::ckResponseStatusText(rest) Debug "response header: " + CkRest::ckResponseHeader(rest) Debug "response body: " + responseXml Debug "---" Debug "LastRequestStartLine: " + CkRest::ckLastRequestStartLine(rest) Debug "LastRequestHeader: " + CkRest::ckLastRequestHeader(rest) EndIf ; Load the XML response into Chilkat XMl and emit via GetXml to see the XML in a pretty-printed (indented) readable format. xml.i = CkXml::ckCreate() If xml.i = 0 Debug "Failed to create object." ProcedureReturn EndIf CkXml::ckLoadXml(xml,responseXml) Debug CkXml::ckGetXml(xml) Debug "----" Debug "Multipart upload completed." CkXml::ckDispose(xmlInit) CkXml::ckDispose(xmlPartsList) CkRest::ckDispose(rest) CkAuthAws::ckDispose(authAws) CkXml::ckDispose(xml) ProcedureReturn EndProcedure
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