Swift

REST Asynchronous Streaming Upload File

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Demonstrates how to asynchronous streaming upload a file to cloud storage. This particular example demonstrates an upload to the Azure Cloud Storage service. The same concepts apply to S3, Google Cloud, and Google Drive. Swift

func chilkatTest() {
    var success: Bool = false

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

    let rest = CkoRest()!

    // Connect to the Azure Storage Blob Service
    var bTls: Bool = true
    var port: Int = 443
    var bAutoReconnect: Bool = true
    // In this example, the storage account name is "chilkat".
    success = rest.connect(hostname: "chilkat.blob.core.windows.net", port: port, tls: bTls, autoReconnect: bAutoReconnect)
    if success != true {
        print("\(rest.lastErrorText!)")
        return
    }

    // Provide Azure Cloud credentials for the REST call.
    let azAuth = CkoAuthAzureStorage()!
    azAuth.accessKey = "AZURE_ACCESS_KEY"
    // The account name used here should match the 1st part of the domain passed in the call to Connect (above).
    azAuth.account = "chilkat"
    azAuth.scheme = "SharedKey"
    azAuth.service = "Blob"
    // This causes the "x-ms-version: 2021-08-06" header to be automatically added.
    azAuth.xMsVersion = "2021-08-06"
    success = rest.setAuthAzureStorage(authProvider: azAuth)

    // Set some request headers.
    success = rest.addHeader(name: "x-ms-blob-content-disposition", value: "attachment; filename=\"thisIsATest.txt\"")
    success = rest.addHeader(name: "x-ms-blob-type", value: "BlockBlob")
    success = rest.addHeader(name: "x-ms-meta-m1", value: "v1")
    success = rest.addHeader(name: "x-ms-meta-m2", value: "v2")

    // Note: The application does not need to explicitly set the following
    // headers: x-ms-date, Authorization, and Content-Length.  These headers
    // are automatically set by Chilkat.

    let sendStream = CkoStream()!

    // Define the source data for the stream to be a file.
    sendStream.sourceFile = "qa_data/hamlet.xml"

    // Create a background thread task to upload from the stream
    // The name of the Azure storage container is "test".
    var task: CkoTask? = rest.fullRequestStreamAsync(httpVerb: "PUT", uriPath: "/test/thisIsATest.txt", stream: sendStream)

    // Start the task. 
    success = task!.run()

    // In this example, we'll simply sleep and periodically
    // check to see if the REST upload if finished.
    var curPctDone: Int = 0
    while task!.finished != true {
        task!.sleepMs(numMs: 100)
    }

    // Check to see if the call to FullRequestStream in the background thread pool succeeded.
    if task!.taskSuccess != true {
        // Show what would've been the LastErrorText had FullRequestStream been called synchronously
        print("\(task!.resultErrorText!)")
        task = nil
        return
    }

    var responseStatusCode: Int = rest.responseStatusCode.intValue

    // When successful, the Azure Storage service will respond with a 201 response code,
    // with an empty body.  Therefore, in the success condition, the responseStr is empty.
    if responseStatusCode == 201 {
        print("File uploaded.")
    }
    else {
        // It failed, so examine the response body, if one was returned:
        // Given that FullRequestStream returns a string, the return value is obtained via GetResultString.
        var responseBodyStr: String? = task!.getResultString()
        print("response body (if any): \(responseBodyStr!)")

        // 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("---")
        print("LastRequestStartLine: \(rest.lastRequestStartLine!)")
        print("LastRequestHeader: \(rest.lastRequestHeader!)")
    }

    task = nil

}