(PowerShell) 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.

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Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# 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.

$xmlInit = New-Object Chilkat.Xml
$success = $xmlInit.LoadXmlFile("s3_multipart_uploads/initiate.xml")
if ($success -ne $true) {
    $("Did not find the initiate.xml XML file.")
    exit
}

$uploadId = $xmlInit.GetChildContent("UploadId")
$("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.
$fac = New-Object Chilkat.FileAccess
$fac.OpenForRead($fileToUploadPath)

# How many parts will there be if each part is 5242880 bytes?
$numParts = $fac.GetNumBlocks($partSize)
$("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"
$partsListXml = New-Object Chilkat.Xml
if ($fac.FileExists($partsListFile) -eq $true) {
    $partsListXml.LoadXmlFile($partsListFile)
}

# 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.
$rest = New-Object Chilkat.Rest

# Connect to the Amazon AWS REST server.
$bTls = $true
$port = 443
$bAutoReconnect = $true
$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.
$authAws = New-Object Chilkat.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
$sbPartNumber = New-Object Chilkat.StringBuilder

while (($partNumber -le $numParts)) {
    $("---- " + $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()
    $sbPartNumber.AppendInt($partNumber)

    $bPartAlreadyUploaded = $false

    # If there are no children, then the XML is empty and no parts have yet been uploaded.
    $numUploadedParts = $partsListXml.NumChildren
    if ($numUploadedParts -gt 0) {
        # 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 = $partsListXml.GetChild(0)
        $foundRec = $xRec0.FindNextRecord("PartNumber",$sbPartNumber.GetAsString())
        if ($xRec0.LastMethodSuccess -eq $true) {
            $bPartAlreadyUploaded = $true
            $("Part " + $partNumber + " was previously uploaded.")
            $($foundRec.GetXml())

        }

    }

    # 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 -eq $false) {
        $("Uploading part " + $partNumber + " ...")

        # Setup the stream source for the large file to be uploaded..
        $fileStream = New-Object Chilkat.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.
        $rest.ClearAllQueryParams()
        $rest.AddQueryParam("partNumber",$sbPartNumber.GetAsString())
        $rest.AddQueryParam("uploadId",$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 -ne $true) {
            $($rest.LastErrorText)
            exit
        }

        if ($rest.ResponseStatusCode -ne 200) {
            # Examine the request/response to see what happened.
            $("response status code = " + $rest.ResponseStatusCode)
            $("response status text = " + $rest.ResponseStatusText)
            $("response header: " + $rest.ResponseHeader)
            $("response body: " + $responseStr)
            $("---")
            $("LastRequestStartLine: " + $rest.LastRequestStartLine)
            $("LastRequestHeader: " + $rest.LastRequestHeader)
            exit
        }

        # 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 -ne $true) {
            $("No ETag response header found!")
            $("response header: " + $rest.ResponseHeader)
            exit
        }

        # We need to add record to the partsListXml.
        # The record will look like this:
        # <Part>
        #   <PartNumber>PartNumber</PartNumber>
        #   <ETag>ETag</ETag>
        # </Part>
        $xPart = $partsListXml.NewChild("Part","")
        $xPart.NewChildInt2("PartNumber",$partNumber)
        $xPart.NewChild2("ETag",$etag)

        $success = $partsListXml.SaveXml($partsListFile)
        if ($success -ne $true) {
            $($partsListXml.LastErrorText)
            exit
        }

        $("-- Part " + $partNumber + " uploaded. ---------------------")
    }

    $partNumber = $partNumber + 1
}

$("Finished.  All parts uploaded.")