(Swift 3,4,5...) Azure Service Bus - Send Batch of Messages to Topic or Queue

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Shows how to send a batch of messages to a service bus queue or topic.

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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())

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

    // Send to a topic (or queue) named "gilaMonster";
    var topicOrQueueName: String? = "gilaMonster"

    // The HTTP request body contains JSON that contains multiple messages.
    let json = CkoJsonObject()!
    json.i = 0
    json.update("messages[i].Body", value: "This is the first message")
    json.update("messages[i].BrokerProperties.Label", value: "M1")
    json.update("messages[i].BrokerProperties.TimeToLiveTimeSpan", value: "0.00:00:40")

    json.i = 1
    json.update("messages[i].Body", value: "This is the second message")
    json.update("messages[i].BrokerProperties.Label", value: "M2")
    json.update("messages[i].UserProperties.Priority", value: "Low")

    json.i = 2
    json.update("messages[i].Body", value: "This is the third message")
    json.update("messages[i].BrokerProperties.Label", value: "M3")
    json.update("messages[i].UserProperties.Priority", value: "Medium")
    json.update("messages[i].UserProperties.Customer", value: "ABC")

    var jsonA: CkoJsonArray? = json.array(of: "messages")
    jsonA.emitCompact = false
    print("\(jsonA!.emit()!)")

    // The following JSON array is produced by the above code:

    // 	[
    // 	  {
    // 	    "Body": "This is the first message",
    // 	    "BrokerProperties": {
    // 	      "Label": "M1",
    // 	      "TimeToLiveTimeSpan": "0.00:00:40"
    // 	    }
    // 	  },
    // 	  {
    // 	    "Body": "This is the second message",
    // 	    "BrokerProperties": {
    // 	      "Label": "M2"
    // 	    },
    // 	    "UserProperties": {
    // 	      "Priority": "Low"
    // 	    }
    // 	  },
    // 	  {
    // 	    "Body": "This is the third message",
    // 	    "BrokerProperties": {
    // 	      "Label": "M3"
    // 	    },
    // 	    "UserProperties": {
    // 	      "Priority": "Medium",
    // 	      "Customer": "ABC"
    // 	    }
    // 	  }
    // 	]

    let sbRequestBody = CkoStringBuilder()!
    jsonA.emitCompact = true
    jsonA!.emitSb(sbRequestBody)
    jsonA = nil

    // Build the path..
    let sbPath = CkoStringBuilder()!
    sbPath.append("/")
    sbPath.append(topicOrQueueName)
    sbPath.append("/messages")

    // Add timeout and api-version query parameters.
    rest.addQueryParam("timeout", value: "20")

    // The Content-Type should be "application/vnd.microsoft.servicebus.json"
    rest.addHeader("Content-Type", value: "application/vnd.microsoft.servicebus.json")

    let sbResponseBody = CkoStringBuilder()!
    success = rest.fullRequestSb("POST", uriPath: sbPath.getAsString(), requestBody: sbRequestBody, responseBody: sbResponseBody)
    if success != true {
        print("\(rest.lastErrorText!)")
        return
    }

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

    // Check for a success response.
    if rest.responseStatusCode.intValue != 201 {
        print("\(rest.lastRequestStartLine!)")
        print("\(rest.lastRequestHeader!)")
        print("\(sbResponseBody.getAsString()!)")
        print("Failed.")
        return
    }

    // If successful, the 201 response will have no response body.

    print("Success.")

}