EventBridge:Route events to Message Queue for RabbitMQ

Step 1: Create a custom event source

1. Log on to the EventBridge console.
2. In the left-side navigation pane, click Event Buses.
3. In the top navigation bar, select the region.
4. On the Event Buses page, click the name of the custom event bus that you want to manage.
5. In the left-side navigation pane, click Event Sources.
6. On the Event Sources page, click Add Event Source.
7. In the Add Custom Event Source panel, set the Name and Description parameters, select Custom Application from the Event Provider drop-down list, and then click OK.

Step 2: Create an event rule

1. Log on to the EventBridge console.
2. In the left-side navigation pane, click Event Buses.
3. In the top navigation bar, select the region.
4. On the Event Buses page, click the name of the event bus that you want to manage.
5. In the left-side navigation pane, click Event Rules.
6. On the Event Rules page, click Create Rule.
7. Complete the Create Rule wizard.
   1. In the Configure Basic Info step, enter a rule name in the Name field and a rule description in the Description field, and click Next Step.
   2. In the Configure Event Pattern step, set the Event Source Type parameter to Custom Event Source, select the custom event source that is created in Step 1 from the Event Source drop-down list, specify an event pattern in the Pattern Content code editor, and then click Next Step.

      For more information, see Event patterns.

   3. In the Configure Targets step, configure an event target. Then, click Create.
      Note You can configure a maximum of five event targets for an event rule.

      The following table describes the parameters that you can set if you select Message Queue for RabbitMQ as the event target.

      Parameter	Description
      Service Type	Click Message Queue for RabbitMQ.
      Instance ID	Select the ID of the created Message Queue for RabbitMQ instance.
      vhost	Select the created vhost.
      Destination Type	Click Exchange or Queue.
      Exchange	Select the created exchange. This parameter is required only when you set the Destination Type parameter to Exchange.
      Message Routing Key	Click Partial Event or Constant. This parameter is required only when you set the Destination Type parameter to Exchange.
      Queue	Select the created queue. This parameter is required only when you set the Destination Type parameter to Queue.
      Body	Click Complete Event, Partial Event, Constant, or Template.
      MessageId	Click Partial Event, Constant, or Template.
      Properties	Click Partial Event or Template. Note The value of this parameter is of the MAP type.

      The following part provides examples of event transformation methods of EventBridge. For more information, see Event transformation.

      • Example of partial event

        $.data.body

      • Example of constant

        Pay attention to the alert. 

      • Examples of variable and template

        Sample variable:

        {
          "type":"$.type"
        }

        Sample template:

        The event type is ${type}.

Step 3: Publish an event

1. Log on to the EventBridge console.
2. In the left-side navigation pane, click Event Buses.
3. In the top navigation bar, select a region.
4. On the Event Buses page, find the event bus to which you want to publish an event and click Publish Event in the Operations column.
   Note You can publish events only to custom event buses in the EventBridge console.
5. In the Publish Event to Custom Event Bus panel, select a custom event source from the Custom Event Source drop-down list, enter the event content in the Event Body code editor, and then click OK.
   For more information about the event parameters, see Overview.

Verify the result

You can check whether the event is received in the Message Queue for RabbitMQ console.

1. Log on to the Message Queue for RabbitMQ console.
2. In the Resource Distribution section of the Overview page, select the region where the instance is deployed.
3. On the Instances page, find the instance that you require, and choose More > Message Query in the Actions column.
4. On the Message Query page, select Query by Queue from the Query Method drop-down list, the vhost whose messages you want to query from the Vhost drop-down list, and the queue whose messages you want to query from the Queue drop-down list, set the time range to query, and then click Query.

The following sample code shows the content of the received event:

{
    "datacontenttype":"application/json;charset=utf-8",
    "aliyunaccountid":"143998900779****",
    "data":{
        "envelope":{
            "deliveryTag":98,
            "exchange":"",
            "redeliver":false,
            "routingKey":"housekeeping"
        },
        "body":{
            "Hello":"EventBridge"
        },
        "props":{
            "contentEncoding":"UTF-8",
            "messageId":"f7622d51-e198-41de-a072-77c1ead7****"
        }
    },
    "subject":"acs:amqp:cn-hangzhou:143998900779****:/instances/amqp-cn-zvp2av0m****/vhosts/eb-connect/queues/housekeeping",
    "aliyunoriginalaccountid":"143998900779****",
    "source":"housekeeping.rabbitmq",
    "type":"amqp:Queue:SendMessage",
    "aliyunpublishtime":"2021-08-12T06:56:50.783Z",
    "specversion":"1.0",
    "aliyuneventbusname":"Housekeeping-Connect",
    "id":"8b09e19b-8cbd-4c46-ab77-9cc39c44****",
    "time":"2021-08-12T06:56:40.709Z",
    "aliyunregionid":"cn-hangzhou"
}