Lua

S3 Complete a Multipart Upload

See more Amazon S3 (new) Examples

This operation completes a multipart upload by assembling previously uploaded parts.

Processing of a Complete Multipart Upload request could take several minutes to complete. After Amazon S3 begins processing the request, it sends an HTTP response header that specifies a 200 OK response. While processing is in progress, Amazon S3 periodically sends whitespace characters to keep the connection from timing out. Because a request could fail after the initial 200 OK response has been sent, it is important that you check the response body to determine whether the request succeeded.

This example sends a POST request to complete a multipart upload, which looks like this:

POST /ObjectName?uploadId=UploadId HTTP/1.1
Host: BucketName.s3.amazonaws.com
Date: Date
Content-Length: Size
Authorization: authorization string

<CompleteMultipartUpload>
  <Part>
    <PartNumber>PartNumber</PartNumber>
    <ETag>ETag</ETag>
  </Part>
  ...
</CompleteMultipartUpload>

Lua

local chilkat = require("chilkat")

-- This example requires the Chilkat API to have been previously unlocked.
-- See Global Unlock Sample for sample code.

-- The 1st step in an S3 multipart upload is to initiate it,
-- as shown here: Initiate S3 Multipart Upload

-- The 2nd step is to upload the parts
-- as shown here: S3 Upload Parts

-- The 3rd and final step (this example) is to complete the multipart upload.

-- Other S3 Multipart Upload Examples:
-- Abort Multipart Upload
-- List Parts

-- When the multipart upload was initiated, an UploadId was provided in the XML response, and it
-- was saved to a file.  Steps 2 and 3 begin by loading the XML and getting
-- the Upload ID.

local xmlInit = chilkat.Xml.new()
local success = xmlInit:load_xml_file("s3_multipart_uploads/initiate.xml")
if not success then
    print("Did not find the initiate.xml XML file.")
    return
end

local uploadId = xmlInit:get_child_content("UploadId")
print("UploadId = " .. uploadId)

-- We'll also need the XML file that contains a record of the parts
-- with part numbers and ETags.  (This file was produced when parts were being uploaded.)
local xmlPartsList = chilkat.Xml.new()
success = xmlPartsList:load_xml_file("s3_multipart_uploads/partsList.xml")
if not success then
    print("Did not find the partsList.xml XML file.")
    return
end

local rest = chilkat.Rest.new()

-- Connect to the Amazon AWS REST server.
local bTls = true
local port = 443
local 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.
local authAws = chilkat.AuthAws.new()
authAws.access_key = "AWS_ACCESS_KEY"
authAws.secret_key = "AWS_SECRET_KEY"
authAws.service_name = "s3"

success = rest:set_auth_aws(authAws)

-- Set the bucket name via the HOST header.
-- In this case, the bucket name is "chilkat100".
rest.host = "chilkat100.s3.amazonaws.com"

-- The "uploadId=UploadId" must be added as a query parameter.  This allows it to be
-- incorporated into the AWS signature calculation, which is a requirement.
-- Therefore, we use AddQueryParam:
rest:add_query_param("uploadId", uploadId)

-- Our ObjectName in this case is "somethingBig.zip".
local responseXml = rest:full_request_string("POST", "/somethingBig.zip", xmlPartsList:get_xml())
if not rest.last_method_success then
    print(rest.last_error_text)
    return
end

-- When successful, the S3 Storage service will respond with a 200 response code,
-- with an XML body.
if rest.response_status_code ~= 200 then
    -- Examine the request/response to see what happened.
    print("response status code = " .. rest.response_status_code)
    print("response status text = " .. rest.response_status_text)
    print("response header: " .. rest.response_header)
    print("response body: " .. responseXml)
    print("---")
    print("LastRequestStartLine: " .. rest.last_request_start_line)
    print("LastRequestHeader: " .. rest.last_request_header)
end

-- Load the XML response into Chilkat XMl and emit via GetXml to see the XML in a pretty-printed (indented) readable format.
local xml = chilkat.Xml.new()
xml:load_xml(responseXml)
print(xml:get_xml())
print("----")

print("Multipart upload completed.")