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(Ruby) 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 Ruby Downloads

Ruby Library for Linux and MAC OS X

require 'chilkat'

#  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 = Chilkat::CkXml.new()
success = xmlInit.LoadXmlFile("s3_multipart_uploads/initiate.xml")
if (success != true)
    print "Did not find the initiate.xml XML file." + "\n";
    exit
end

uploadId = xmlInit.getChildContent("UploadId")
print "UploadId = " + uploadId + "\n";

#  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 = Chilkat::CkFileAccess.new()
fac.OpenForRead(fileToUploadPath)

#  How many parts will there be if each part is 5242880 bytes?
numParts = fac.GetNumBlocks(partSize)
print "numParts = " + numParts.to_s() + "\n";
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 = Chilkat::CkXml.new()
if (fac.FileExists(partsListFile) == true)
    partsListXml.LoadXmlFile(partsListFile)
end

#  Make sure the top-level tag is "CompleteMultipartUpload"
partsListXml.put_Tag("CompleteMultipartUpload")

#  --------------------------------------
#  Before entering the loop to upload parts,
#  setup the REST object with AWS authentication,
#  and make the initial connection.
rest = Chilkat::CkRest.new()

#  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 = Chilkat::CkAuthAws.new()
authAws.put_AccessKey("AWS_ACCESS_KEY")
authAws.put_SecretKey("AWS_SECRET_KEY")
authAws.put_ServiceName("s3")
success = rest.SetAuthAws(authAws)

#  Set the bucket name via the HOST header.
#  In this case, the bucket name is "chilkat100".
rest.put_Host("chilkat100.s3.amazonaws.com")
#  --------------------------------------

partNumber = 1
sbPartNumber = Chilkat::CkStringBuilder.new()

while (partNumber <= numParts)
    print "---- " + partNumber.to_s() + " ----" + "\n";

    #  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.get_NumChildren()
    if (numUploadedParts > 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 is a CkXml
        xRec0 = partsListXml.GetChild(0)
        # foundRec is a CkXml
        foundRec = xRec0.FindNextRecord("PartNumber",sbPartNumber.getAsString())
        if (xRec0.get_LastMethodSuccess() == true)
            bPartAlreadyUploaded = true
            print "Part " + partNumber.to_s() + " was previously uploaded." + "\n";
            print foundRec.getXml() + "\n";

        end

    end

    #  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 == false)
        print "Uploading part " + partNumber.to_s() + " ..." + "\n";

        #  Setup the stream source for the large file to be uploaded..
        fileStream = Chilkat::CkStream.new()
        fileStream.put_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.put_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.put_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.get_LastMethodSuccess() != true)
            print rest.lastErrorText() + "\n";
            exit
        end

        if (rest.get_ResponseStatusCode() != 200)
            #  Examine the request/response to see what happened.
            print "response status code = " + rest.get_ResponseStatusCode().to_s() + "\n";
            print "response status text = " + rest.responseStatusText() + "\n";
            print "response header: " + rest.responseHeader() + "\n";
            print "response body: " + responseStr + "\n";
            print "---" + "\n";
            print "LastRequestStartLine: " + rest.lastRequestStartLine() + "\n";
            print "LastRequestHeader: " + rest.lastRequestHeader() + "\n";
            exit
        end

        #  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.get_LastMethodSuccess() != true)
            print "No ETag response header found!" + "\n";
            print "response header: " + rest.responseHeader() + "\n";
            exit
        end

        #  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 CkXml
        xPart = partsListXml.NewChild("Part","")
        xPart.NewChildInt2("PartNumber",partNumber)
        xPart.NewChild2("ETag",etag)

        success = partsListXml.SaveXml(partsListFile)
        if (success != true)
            print partsListXml.lastErrorText() + "\n";
            exit
        end

        print "-- Part " + partNumber.to_s() + " uploaded. ---------------------" + "\n";
    end

    partNumber = partNumber + 1
end

print "Finished.  All parts uploaded." + "\n";

 

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