Rust

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>

Rust

// 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.

let xml_init = chilkat::Xml::new();
if xml_init.load_xml_file("s3_multipart_uploads/initiate.xml").is_err() {
    println!("Did not find the initiate.xml XML file.");
    return;
}

let upload_id = xml_init.get_child_content("UploadId").unwrap_or_default();
println!("UploadId = {}", upload_id);

// 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.)
let xml_parts_list = chilkat::Xml::new();
if xml_parts_list.load_xml_file("s3_multipart_uploads/partsList.xml").is_err() {
    println!("Did not find the partsList.xml XML file.");
    return;
}

let rest = chilkat::Rest::new();

// Connect to the Amazon AWS REST server.
let b_tls = true;
let port = 443;
let b_auto_reconnect = true;
let _ = rest.connect("s3.amazonaws.com", port, b_tls, b_auto_reconnect).is_ok();

// ----------------------------------------------------------------------------
// 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.
let auth_aws = chilkat::AuthAws::new();
auth_aws.set_access_key("AWS_ACCESS_KEY");
auth_aws.set_secret_key("AWS_SECRET_KEY");
auth_aws.set_service_name("s3");

let _ = rest.set_auth_aws(&auth_aws).is_ok();

// Set the bucket name via the HOST header.
// In this case, the bucket name is "chilkat100".
rest.set_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:
let _ = rest.add_query_param("uploadId", &upload_id);

// Our ObjectName in this case is "somethingBig.zip".
let Ok(response_xml) = rest.full_request_string("POST", "/somethingBig.zip", &xml_parts_list.get_xml().unwrap_or_default()) else {
    println!("{}", rest.last_error_text());
    return;
};

// When successful, the S3 Storage service will respond with a 200 response code,
// with an XML body.  
if rest.response_status_code() != 200 {
    // Examine the request/response to see what happened.
    println!("response status code = {}", rest.response_status_code());
    println!("response status text = {}", rest.response_status_text());
    println!("response header: {}", rest.response_header());
    println!("response body: {}", response_xml);
    println!("---");
    println!("LastRequestStartLine: {}", rest.last_request_start_line());
    println!("LastRequestHeader: {}", rest.last_request_header());
}

// Load the XML response into Chilkat XMl and emit via GetXml to see the XML in a pretty-printed (indented) readable format.
let xml = chilkat::Xml::new();
let _ = xml.load_xml(&response_xml);
println!("{}", xml.get_xml().unwrap_or_default());
println!("----");

println!("Multipart upload completed.");