Classic ASP
Classic ASP
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.
Chilkat Classic ASP Downloads
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<%
success = 0
' 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 = Server.CreateObject("Chilkat.Xml")
success = xmlInit.LoadXmlFile("s3_multipart_uploads/initiate.xml")
If (success <> 1) Then
Response.Write "<pre>" & Server.HTMLEncode( "Did not find the initiate.xml XML file.") & "</pre>"
Response.End
End If
uploadId = xmlInit.GetChildContent("UploadId")
Response.Write "<pre>" & Server.HTMLEncode( "UploadId = " & uploadId) & "</pre>"
' 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 = Server.CreateObject("Chilkat.FileAccess")
success = fac.OpenForRead(fileToUploadPath)
' How many parts will there be if each part is 5242880 bytes?
numParts = fac.GetNumBlocks(partSize)
Response.Write "<pre>" & Server.HTMLEncode( "numParts = " & numParts) & "</pre>"
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 = Server.CreateObject("Chilkat.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 = Server.CreateObject("Chilkat.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 = Server.CreateObject("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
set sbPartNumber = Server.CreateObject("Chilkat.StringBuilder")
Do While (partNumber <= numParts)
Response.Write "<pre>" & Server.HTMLEncode( "---- " & partNumber & " ----") & "</pre>"
' 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.Xml
Set xRec0 = partsListXml.GetChild(0)
' foundRec is a Chilkat.Xml
Set foundRec = xRec0.FindNextRecord("PartNumber",sbPartNumber.GetAsString())
If (xRec0.LastMethodSuccess = 1) Then
bPartAlreadyUploaded = 1
Response.Write "<pre>" & Server.HTMLEncode( "Part " & partNumber & " was previously uploaded.") & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( foundRec.GetXml()) & "</pre>"
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
Response.Write "<pre>" & Server.HTMLEncode( "Uploading part " & partNumber & " ...") & "</pre>"
' Setup the stream source for the large file to be uploaded..
set fileStream = Server.CreateObject("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.
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
Response.Write "<pre>" & Server.HTMLEncode( rest.LastErrorText) & "</pre>"
Response.End
End If
If (rest.ResponseStatusCode <> 200) Then
' Examine the request/response to see what happened.
Response.Write "<pre>" & Server.HTMLEncode( "response status code = " & rest.ResponseStatusCode) & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( "response status text = " & rest.ResponseStatusText) & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( "response header: " & rest.ResponseHeader) & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( "response body: " & responseStr) & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( "---") & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( "LastRequestStartLine: " & rest.LastRequestStartLine) & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( "LastRequestHeader: " & rest.LastRequestHeader) & "</pre>"
Response.End
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
Response.Write "<pre>" & Server.HTMLEncode( "No ETag response header found!") & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( "response header: " & rest.ResponseHeader) & "</pre>"
Response.End
End If
' We need to add record to the partsListXml.
' The record will look like this:
' <Part>
' <PartNumber>PartNumber</PartNumber>
' <ETag>ETag</ETag>
' </Part>
' xPart is a Chilkat.Xml
Set xPart = partsListXml.NewChild("Part","")
xPart.NewChildInt2 "PartNumber",partNumber
xPart.NewChild2 "ETag",etag
success = partsListXml.SaveXml(partsListFile)
If (success <> 1) Then
Response.Write "<pre>" & Server.HTMLEncode( partsListXml.LastErrorText) & "</pre>"
Response.End
End If
Response.Write "<pre>" & Server.HTMLEncode( "-- Part " & partNumber & " uploaded. ---------------------") & "</pre>"
End If
partNumber = partNumber + 1
Loop
Response.Write "<pre>" & Server.HTMLEncode( "Finished. All parts uploaded.") & "</pre>"
%>
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