(Swift 3,4,5...) Azure Service Bus - Receive and Delete Message from Subscription

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Shows how to receive and delete a message from an Azure service bus topic subscription.

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func chilkatTest() {
    // Note: Requires Chilkat v9.5.0.65 or greater.

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

    // Make the initial connection.
    // A single REST object, once connected, can be used for many Azure Service Bus REST API calls.
    // The auto-reconnect indicates that if the already-established HTTPS connection is closed,
    // then it will be automatically re-established as needed.
    let rest = CkoRest()!
    var bAutoReconnect: Bool = true
    var success: Bool = rest.connect("<yournamespace>.servicebus.windows.net", port: 443, tls: true, autoReconnect: bAutoReconnect)
    if success != true {
        print("\(rest.lastErrorText!)")
        return
    }

    // ----------------------------------------------------------------------------------------------
    // The code above this comment could be placed inside a function/subroutine within the application
    // because the connection does not need to be made for every request.  Once the connection is made
    // the app may send many requests..
    // ----------------------------------------------------------------------------------------------

    // Let's load a previously computed SAS token and use it.
    // See Azure Shared Access Signature for an example to genenerate an Azure SAS token.
    let sbToken = CkoStringBuilder()!
    sbToken.loadFile("qa_data/tokens/serviceBusSas.txt", charset: "utf-8")

    // Tell the REST object to use the Azure Shared Access Signature for authorization.
    sbToken.prepend("SharedAccessSignature ")
    rest.addHeader("Authorization", value: sbToken.getAsString())

    // ----------------------------------------------------------------------------------------------

    // Receive a message from the subscription "feedings" in the topic "gilaMonster"
    var topicName: String? = "gilaMonster"
    var subscriptionName: String? = "feedings"

    // Build the path..
    let sbPath = CkoStringBuilder()!
    sbPath.append("/")
    sbPath.append(topicName)
    sbPath.append("/subscriptions/")
    sbPath.append(subscriptionName)
    sbPath.append("/messages/head")

    // Add a timeout parameter.
    rest.addQueryParam("timeout", value: "20")

    // Use the DELETE HTTP verb to read the message at the head of the queue and remove it.
    let sbResponseBody = CkoStringBuilder()!
    success = rest.fullRequestNoBodySb("DELETE", uriPath: sbPath.getAsString(), sb: sbResponseBody)
    if success != true {
        print("\(rest.lastErrorText!)")
        return
    }

    print("Response Status Code = \(rest.responseStatusCode.intValue)")

    // Check for a success response.
    if rest.responseStatusCode.intValue != 200 {
        print("\(rest.lastRequestStartLine!)")
        print("\(rest.lastRequestHeader!)")
        print("\(sbResponseBody.getAsString()!)")
        print("Failed.")
        return
    }

    // If successful, the message is the contents of the response body.
    var message: String? = sbResponseBody.getAsString()
    print("Received message: \(message!)")

    print("Success.")

}