Swift
Swift
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 Swift Downloads
func chilkatTest() {
var success: Bool = 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.
let xmlInit = CkoXml()!
success = xmlInit.loadFile(path: "s3_multipart_uploads/initiate.xml")
if success != true {
print("Did not find the initiate.xml XML file.")
return
}
var uploadId: String? = xmlInit.getChildContent(tagPath: "UploadId")
print("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
var fileToUploadPath: String? = "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.
var partSize: Int = 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.
let fac = CkoFileAccess()!
fac.open(forRead: fileToUploadPath)
// How many parts will there be if each part is 5242880 bytes?
var numParts: Int = fac.getNumBlocks(blockSize: partSize).intValue
print("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..
var partsListFile: String? = "s3_multipart_uploads/partsList.xml"
let partsListXml = CkoXml()!
if fac.fileExists(path: partsListFile) == true {
partsListXml.loadFile(path: 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.
let rest = CkoRest()!
// Connect to the Amazon AWS REST server.
var bTls: Bool = true
var port: Int = 443
var bAutoReconnect: Bool = true
success = rest.connect(hostname: "s3.amazonaws.com", port: port, tls: bTls, autoReconnect: 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.
let authAws = CkoAuthAws()!
authAws.accessKey = "AWS_ACCESS_KEY"
authAws.secretKey = "AWS_SECRET_KEY"
authAws.serviceName = "s3"
success = rest.setAuthAws(authProvider: authAws)
// Set the bucket name via the HOST header.
// In this case, the bucket name is "chilkat100".
rest.host = "chilkat100.s3.amazonaws.com"
// --------------------------------------
var partNumber: Int = 1
let sbPartNumber = CkoStringBuilder()!
while (partNumber <= numParts) {
print("---- \(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(value: partNumber)
var bPartAlreadyUploaded: Bool = false
// If there are no children, then the XML is empty and no parts have yet been uploaded.
var numUploadedParts: Int = partsListXml.numChildren.intValue
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.
var xRec0: CkoXml? = partsListXml.getChild(index: 0)
var foundRec: CkoXml? = xRec0!.findNextRecord(tagPath: "PartNumber", contentPattern: sbPartNumber.getAsString())
if xRec0!.lastMethodSuccess == true {
bPartAlreadyUploaded = true
print("Part \(partNumber) was previously uploaded.")
print("\(foundRec!.getXml()!)")
foundRec = nil
}
xRec0 = nil
}
// 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) ...")
// Setup the stream source for the large file to be uploaded..
let fileStream = CkoStream()!
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(name: "partNumber", value: sbPartNumber.getAsString())
rest.addQueryParam(name: "uploadId", value: 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.
var responseStr: String? = rest.fullRequestStream(httpVerb: "PUT", uriPath: "/somethingBig.zip", stream: fileStream)
if rest.lastMethodSuccess != true {
print("\(rest.lastErrorText!)")
return
}
if rest.responseStatusCode.intValue != 200 {
// Examine the request/response to see what happened.
print("response status code = \(rest.responseStatusCode.intValue)")
print("response status text = \(rest.responseStatusText!)")
print("response header: \(rest.responseHeader!)")
print("response body: \(responseStr!)")
print("---")
print("LastRequestStartLine: \(rest.lastRequestStartLine!)")
print("LastRequestHeader: \(rest.lastRequestHeader!)")
return
}
// OK, this part was uploaded..
// The response will have a 0-length body. The only information we need is the
// ETag response header field.
var etag: String? = rest.responseHdr(byName: "ETag")
// It should be present, but just in case there was no ETag header...
if rest.lastMethodSuccess != true {
print("No ETag response header found!")
print("response header: \(rest.responseHeader!)")
return
}
// We need to add record to the partsListXml.
// The record will look like this:
// <Part>
// <PartNumber>PartNumber</PartNumber>
// <ETag>ETag</ETag>
// </Part>
var xPart: CkoXml? = partsListXml.newChild(tagPath: "Part", content: "")
xPart!.newChildInt2(tagPath: "PartNumber", value: partNumber)
xPart!.newChild2(tagPath: "ETag", content: etag)
xPart = nil
success = partsListXml.save(path: partsListFile)
if success != true {
print("\(partsListXml.lastErrorText!)")
return
}
print("-- Part \(partNumber) uploaded. ---------------------")
}
partNumber = partNumber + 1
}
print("Finished. All parts uploaded.")
}