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S3 Upload the Parts for a Multipart Upload
See more Amazon S3 (new) Examples
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-x64\ChilkatDotNet47.dll"
$success = $false
# 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.")