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VBScript Examples

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(VBScript) S3 Upload the Parts for a Multipart Upload

This example uploads a large file in parts. The multipart upload needs to have been first initiated prior to uploading the parts.

See http://docs.aws.amazon.com/AmazonS3/latest/API/mpUploadUploadPart.html for more information about uploading parts.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
Set outFile = fso.CreateTextFile("output.txt", True)

'  In the 1st step for uploading a large file, the multipart upload was initiated
'  as shown here: Initiate Multipart Upload

'  Other S3 Multipart Upload Examples:
'  Complete Multipart Upload
'  Abort Multipart Upload
'  List Parts

'  When we initiated the multipart upload, we saved the XML response to a file.  This
'  XML response contains the UploadId.  We'll begin by loading that XML and getting
'  the Upload ID.

set xmlInit = CreateObject("Chilkat_9_5_0.Xml")
success = xmlInit.LoadXmlFile("s3_multipart_uploads/initiate.xml")
If (success <> 1) Then
    outFile.WriteLine("Did not find the initiate.xml XML file.")
    WScript.Quit
End If

uploadId = xmlInit.GetChildContent("UploadId")
outFile.WriteLine("UploadId = " & uploadId)

'  When uploading parts, we need to keep an XML record of each part number
'  and its corresponding ETag, which is received in the response for each part.
'  There can be up to 10000 parts, numbered 1 to 10000.
'  After all parts have been uploaded, the final step will be to complete
'  the multipart upload (see Complete Multipart Upload)

'  In this example, the large file we want to upload is somethingBig.zip
fileToUploadPath = "s3_multipart_uploads/somethingBig.zip"

'  The minimum allowed part size is 5MB (5242880 bytes).  The last part can be smaller because
'  it will contain the remainder of the file.  (This minimum is enforced by the AWS service.)
'  We'll use the minimum allowed part size for this example.
partSize = 5242880

'  Let's use Chilkat's FileAccess API to examine the file to be uploaded.  We'll get the size
'  of the file and find out how many parts will be needed, including the final "partial" part.
set fac = CreateObject("Chilkat_9_5_0.FileAccess")
success = fac.OpenForRead(fileToUploadPath)

'  How many parts will there be if each part is 5242880 bytes?
numParts = fac.GetNumBlocks(partSize)
outFile.WriteLine("numParts = " & numParts)
fac.FileClose 

'  Imagine that we may be running this for the 1st time, or maybe we already
'  attempted to upload parts, and something failed. Maybe there was a network problem
'  the resulted in not all parts getting uploaded.  We'll write this code so that if run again,
'  it will upload whatever parts haven't yet been uploaded.

'  We'll keep a partsList.xml file to record the parts that have already been successfully
'  uploaded.  If this file does not yet exist, we'll create it..
partsListFile = "s3_multipart_uploads/partsList.xml"
set partsListXml = CreateObject("Chilkat_9_5_0.Xml")
If (fac.FileExists(partsListFile) = 1) Then
    success = partsListXml.LoadXmlFile(partsListFile)
End If

'  Make sure the top-level tag is "CompleteMultipartUpload"
partsListXml.Tag = "CompleteMultipartUpload"

'  --------------------------------------
'  Before entering the loop to upload parts,
'  setup the REST object with AWS authentication,
'  and make the initial connection.
set rest = CreateObject("Chilkat_9_5_0.Rest")

'  Connect to the Amazon AWS REST server.
bTls = 1
port = 443
bAutoReconnect = 1
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.
set authAws = CreateObject("Chilkat_9_5_0.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"
'  --------------------------------------

partNumber = 1
set sbPartNumber = CreateObject("Chilkat_9_5_0.StringBuilder")

Do While (partNumber <= numParts)
    outFile.WriteLine("---- " & partNumber & " ----")

    '  This cumbersome way of converting an integer to a string is because
    '  Chilkat examples are written in a script that is converted to many programming languages.
    '  At this time, the translator does not have integer-to-string code generation capability..
    sbPartNumber.Clear 
    success = sbPartNumber.AppendInt(partNumber)

    bPartAlreadyUploaded = 0

    '  If there are no children, then the XML is empty and no parts have yet been uploaded.
    numUploadedParts = partsListXml.NumChildren
    If (numUploadedParts > 0) Then
        '  If some parts have been uploaded, check to see if this particular part was already upload.
        '  If so, then it can be skipped.

        '  Position ourselves at the 1st record.
        ' xRec0 is a Chilkat_9_5_0.Xml
        Set xRec0 = partsListXml.GetChild(0)
        ' foundRec is a Chilkat_9_5_0.Xml
        Set foundRec = xRec0.FindNextRecord("PartNumber",sbPartNumber.GetAsString())
        If (xRec0.LastMethodSuccess = 1) Then
            bPartAlreadyUploaded = 1
            outFile.WriteLine("Part " & partNumber & " was previously uploaded.")
            outFile.WriteLine(foundRec.GetXml())

        End If

    End If

    '  If this part was not already uploaded, we need to upload.
    '  Also update the partsListXml and save as each part is successfully uploaded.
    If (bPartAlreadyUploaded = 0) Then
        outFile.WriteLine("Uploading part " & partNumber & " ...")

        '  Setup the stream source for the large file to be uploaded..
        set fileStream = CreateObject("Chilkat_9_5_0.Stream")
        fileStream.SourceFile = fileToUploadPath
        '  The Chilkat Stream API has features to make uploading a parts
        '  of a file easy.  Indicate the part size by setting the SourceFilePartSize
        '  property.
        fileStream.SourceFilePartSize = partSize

        '  Our HTTP start line to upload a part will look like this:
        '  PUT /ObjectName?partNumber=PartNumber&uploadId=UploadId HTTP/1.1

        '  Set the query params.  We'll need partNumber and uploadId.
        '  Make sure the query params from previous iterations are clear.
        success = rest.ClearAllQueryParams()
        success = rest.AddQueryParam("partNumber",sbPartNumber.GetAsString())
        success = rest.AddQueryParam("uploadId",uploadId)

        '  Upload this particular file part.
        '  Tell the fileStream which part is being uploaded.
        '  Our partNumber is 1-based (the 1st part is at index 1), but the fileStream's SourceFilePart
        '  property is 0-based.  Therefore we use partNumber-1.
        fileStream.SourceFilePart = partNumber - 1

        '  Because the SourceFilePart and SourceFilePartSize properties are set, the stream will
        '  will provide just that part of the file.
        responseStr = rest.FullRequestStream("PUT","/somethingBig.zip",fileStream)
        If (rest.LastMethodSuccess <> 1) Then
            outFile.WriteLine(rest.LastErrorText)
            WScript.Quit
        End If

        If (rest.ResponseStatusCode <> 200) Then
            '  Examine the request/response to see what happened.
            outFile.WriteLine("response status code = " & rest.ResponseStatusCode)
            outFile.WriteLine("response status text = " & rest.ResponseStatusText)
            outFile.WriteLine("response header: " & rest.ResponseHeader)
            outFile.WriteLine("response body: " & responseStr)
            outFile.WriteLine("---")
            outFile.WriteLine("LastRequestStartLine: " & rest.LastRequestStartLine)
            outFile.WriteLine("LastRequestHeader: " & rest.LastRequestHeader)
            WScript.Quit
        End If

        '  OK, this part was uploaded..
        '  The response will have a 0-length body.  The only information we need is the
        '  ETag response header field.
        etag = rest.ResponseHdrByName("ETag")
        '  It should be present, but just in case there was no ETag header...
        If (rest.LastMethodSuccess <> 1) Then
            outFile.WriteLine("No ETag response header found!")
            outFile.WriteLine("response header: " & rest.ResponseHeader)
            WScript.Quit
        End If

        '  We need to add record to the partsListXml.
        '  The record will look like this:
        '  &lt;Part>
        '    &lt;PartNumber>PartNumber&lt;/PartNumber>
        '    &lt;ETag>ETag&lt;/ETag>
        '  &lt;/Part>
        ' xPart is a Chilkat_9_5_0.Xml
        Set xPart = partsListXml.NewChild("Part","")
        xPart.NewChildInt2 "PartNumber",partNumber
        xPart.NewChild2 "ETag",etag

        success = partsListXml.SaveXml(partsListFile)
        If (success <> 1) Then
            outFile.WriteLine(partsListXml.LastErrorText)
            WScript.Quit
        End If

        outFile.WriteLine("-- Part " & partNumber & " uploaded. ---------------------")
    End If

    partNumber = partNumber + 1
Loop

outFile.WriteLine("Finished.  All parts uploaded.")

outFile.Close

 

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