Integrate Real-Time Access to RabbitMQ in SAPUI5 MVC Apps

Jerod Johnson
Director, Technology Evangelism

Use the built-in ODataModel class in SAPUI5 to create Web apps that reflect changes to RabbitMQ data in real time.

In this article we show how to use the CData API Server to write SAPUI5 apps that leverage the capabilities of the RabbitMQ API, without writing to a back-end database. The API Server is a lightweight Web application that runs on your server and produces OData feeds of RabbitMQ data. OData is the standard for real-time data access over the Web and has built-in support in SAPUI5 and OpenUI5.

Set Up the API Server

If you have not already done so, download the CData API Server. Once you have installed the API Server, follow the steps below to begin producing secure RabbitMQ OData services:

Connect to RabbitMQ

To work with RabbitMQ data from SAPUI5, we start by creating and configuring a RabbitMQ connection. Follow the steps below to configure the API Server to connect to RabbitMQ data:

First, navigate to the Connections page.
Click Add Connection and then search for and select the RabbitMQ connection.
Enter the necessary authentication properties to connect to RabbitMQ.
About RabbitMQ Management HTTP API

RabbitMQ is an open-source message broker that supports multiple messaging protocols. The RabbitMQ Management HTTP API provides HTTP-based access to management and monitoring data for a RabbitMQ server. The API exposes information about virtual hosts, exchanges, queues, bindings, connections, channels, consumers, users, permissions, policies, and cluster-wide statistics.

The Management plugin must be enabled on the RabbitMQ server for the HTTP API to be available. By default, the management interface listens on port 15672.

Using Basic Authentication

RabbitMQ Management HTTP API uses HTTP Basic authentication. You must supply the username and password of a RabbitMQ management user.

To enable access to the management API:
1. Ensure the RabbitMQ Management plugin is enabled on your server (rabbitmq-plugins enable rabbitmq_management).
2. Use an existing management user or create one with the appropriate management tag (management, policymaker, monitoring, or administrator).
3. Note the full base URL of your RabbitMQ Management HTTP API (e.g., http://localhost:15672).
After configuring your RabbitMQ server, set the following connection properties to connect:
- AuthScheme: Set this to Basic.
- URL: Set this to the base URL of your RabbitMQ Management HTTP API (e.g., http://localhost:15672).
- User: Set this to your RabbitMQ management username (e.g., guest).
- Password: Set this to your RabbitMQ management password.
Example connection string:
```
Profile=C:\profiles\RabbitMQ.apip;AuthScheme=Basic;URL=http://localhost:15672;User=guest;Password=guest;
```
Available Tables

The RabbitMQ profile provides access to the following tables:
- Overview - Cluster-wide statistics and information about the RabbitMQ node
- Nodes - Information about individual nodes in the RabbitMQ cluster
- NodeMemory - Detailed memory usage breakdown for a specific cluster node
- Connections - List of all open AMQP connections to the broker
- Channels - List of all open AMQP channels across all connections
- Consumers - List of all consumers registered across all queues
- Exchanges - List of exchanges declared across all virtual hosts
- Queues - List of queues declared across all virtual hosts
- Bindings - List of all bindings between exchanges and queues
- VirtualHosts - List of virtual hosts configured on the broker
- VhostPermissions - User permissions within a specific virtual host
- Users - List of all RabbitMQ users
- Permissions - Permission records for all users across all virtual hosts
- TopicPermissions - Topic-level permission records for all users
- Policies - List of policies applied to queues and exchanges in virtual hosts
- OperatorPolicies - List of operator policies applied to queues in virtual hosts
- Parameters - List of component parameters (e.g., federation, shovel) per virtual host
- GlobalParameters - List of global parameters that apply across all virtual hosts
- VhostLimits - Resource limits configured for specific virtual hosts
- UserLimits - Resource limits configured for specific users
- FeatureFlags - List of feature flags and their enabled/disabled state on the node
- DeprecatedFeatures - List of deprecated features and their usage state
- AuthAttempts - Authentication attempt statistics for the node
- ClusterName - The name of the RabbitMQ cluster
- WhoAmI - Information about the currently authenticated management user
- ExchangeBindingsSource - Bindings for which a specific exchange is the source
- ExchangeBindingsDestination - Bindings for which a specific exchange is the destination
- QueueBindings - Bindings for a specific queue within a virtual host
After configuring the connection, click Save & Test to confirm a successful connection.

Configure API Server Users

Next, create a user to access your RabbitMQ data through the API Server. You can add and configure users on the Users page. Follow the steps below to configure and create a user:

On the Users page, click Add User to open the Add User dialog.
Next, set the Role, Username, and Privileges properties and then click Add User.
An Authtoken is then generated for the user. You can find the Authtoken and other information for each user on the Users page:

Creating API Endpoints for RabbitMQ

Having created a user, you are ready to create API endpoints for the RabbitMQ tables:

First, navigate to the API page and then click Add Table .
Select the connection you wish to access and click Next.
With the connection selected, create endpoints by selecting each table and then clicking Confirm.

Gather the OData Url

Having configured a connection to RabbitMQ data, created a user, and added resources to the API Server, you now have an easily accessible REST API based on the OData protocol for those resources. From the API page in API Server, you can view and copy the API Endpoints for the API:

Create the View

In this article the user views and interacts with RabbitMQ data through an SAPUI5 table control. Table columns will be automatically detected from the metadata retrieved from the API Server's API endpoint. We define the following table in a separate View.view.xml file:


<mvc:View
  controllerName="sap.ui.table.sample.OData2.Controller"
  xmlns="sap.ui.table"
  xmlns:mvc="sap.ui.core.mvc"
  xmlns:u="sap.ui.unified"
  xmlns:c="sap.ui.core"
  xmlns:m="sap.m">
  <m:Page
    showHeader="false"
    enableScrolling="false"
    class="sapUiContentPadding">
    <m:content>
      <Table
        id="table"
        selectionMode="MultiToggle"
        visibleRowCount="10"
        enableSelectAll="false"
        rows="{/AuthAttempts}"
        threshold="15"
        enableBusyIndicator="true"
        columns="{
          path: 'meta>/dataServices/schema/[${namespace}===\'CData\']/entityType/[${name}===\'AuthAttempts\']/property',
          factory: '.columnFactory'
        }">
        <toolbar>
          <m:Toolbar>
            <m:Title text="RabbitMQ AuthAttempts"></m:Title>
          </m:Toolbar>
        </toolbar>
        <noData>
          <m:BusyIndicator class="sapUiMediumMargin"/>
        </noData>
      </Table>
    </m:content>
  </m:Page>
</mvc:View>

Create the Model and Controller

In SAPUI5, you do not need to write any OData queries; an ODataModel instance handles the application's data access commands. The API Server then translates the queries into RabbitMQ API calls.

The controller processes user input and represents information to the user through a view. Define the controller in a new file, Controller.controller.js. Instantiate the model in the onInit function -- you will need to replace the placeholder values for the URL to the API Server, a user allowed to access the OData endpoint of the API Server, and the authtoken for the user.

sap.ui.define([
  "sap/ui/core/mvc/Controller",
  "sap/ui/model/odata/v2/ODataModel",
  "sap/ui/model/json/JSONModel",
  "sap/ui/table/Column",
  "sap/m/Text",
], function(Controller, ODataModel, JSONModel, Column, Text ) {
  "use strict";
  

  return Controller.extend("sap.ui.table.sample.OData2.Controller", {
    
    onInit : function () {
      
      var oView = this.getView();
      var oDataModel = new ODataModel("http://myserver/api.rsc/",{user: "MyUser", password: "MyAuthToken"});
      
      oDataModel.getMetaModel().loaded().then(function(){
        oView.setModel(oDataModel.getMetaModel(), "meta");
      });
      oView.setModel(oDataModel);
      
      var oTable = oView.byId("table");
      var oBinding = oTable.getBinding("rows");
      var oBusyIndicator = oTable.getNoData();
      oBinding.attachDataRequested(function(){
      oTable.setNoData(oBusyIndicator);
      });
      oBinding.attachDataReceived(function(){
        oTable.setNoData(null); //use default again ("no data" in case no data is available)
      });
    },
    
    onExit : function () {
    },
    
    columnFactory : function(sId, oContext) {
      var oModel = this.getView().getModel();
      var sName = oContext.getProperty("name");
      var sType = oContext.getProperty("type");
      var iLen = oContext.getProperty("maxLength");
      iLen = iLen ? parseInt(iLen, 10) : 10;
      
      return new Column(sId, {
        sortProperty: sName, 
        filterProperty: sName,
        width: (iLen > 9 ? (iLen > 50 ? 15 : 10) : 5) + "rem",
        label: new sap.m.Label({text: "{/#AuthAttempts/" + sName + "/@name}"}),
        hAlign: sType && sType.indexOf("Decimal") >= 0 ? "End" : "Begin",
        template: new Text({text: {path: sName}})
      });
    }
    
  });

});

Describe Application Logic

Create a component that contains the resources of your application. Define the following in Component.js:


sap.ui.define([
  'sap/ui/core/UIComponent'
], function(UIComponent) {
  "use strict";

  return UIComponent.extend("sap.ui.table.sample.OData2.Component", {
    metadata : {
      rootView : "sap.ui.table.sample.OData2.View",
      dependencies : {
        libs : [
          "sap.ui.table",
          "sap.ui.unified",
          "sap.m"
        ]
      },

      config : {
        sample : {
          stretch : true,
          files : [
            "View.view.xml",
            "Controller.controller.js"
          ]
        }
      }
    }
  });

});

Bootstrap OpenUI5 and Launch

To complete the MVC application, simply add the bootstrap and initialization code. Add these directly to index.html:

<!DOCTYPE HTML>

<html>
<head>
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <meta charset="utf-8"> 
  <title>RabbitMQ AuthAttempts</title>
  
  <script id="sap-ui-bootstrap"
    src="https://openui5.hana.ondemand.com/resources/sap-ui-core.js"
    data-sap-ui-libs="sap.m"
    data-sap-ui-theme="sap_bluecrystal"
    data-sap-ui-xx-bindingSyntax="complex"
    data-sap-ui-preload="async"
    data-sap-ui-compatVersion="edge" 
    data-sap-ui-resourceroots='{"sap.ui.table.sample.OData2": "./", "sap.ui.demo.mock": "mockdata"}'>
  </script>
  
  <!-- application launch configuration -->
  <script>
  
      sap.ui.getCore().attachInit(function() {
        new sap.m.App ({
          pages: [
                new sap.m.Page({
                    title: "RabbitMQ AuthAttempts", 
                    enableScrolling : false,
                  content: [ new sap.ui.core.ComponentContainer({
                  height : "100%", name : "sap.ui.table.sample.OData2"
                })]
            })
          ]
      }).placeAt("content");
    });

  </script>
</head> 
  <!-- UI Content -->
<body class="sapUiBody" id="content" role="application">
</body> 
</html>

The resulting SAPUI5 table control reflects any changes to a table in the remote RabbitMQ data. You can now browse and search current RabbitMQ data.

A table in SAPUI5 that reflects changes to the data in real time. (Salesforce is shown.)

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Integrate Real-Time Access to RabbitMQ in SAPUI5 MVC Apps

Set Up the API Server

Connect to RabbitMQ

About RabbitMQ Management HTTP API

Using Basic Authentication

Example connection string:

Available Tables