Set up AWS REST API Gateway to put events in EventBridge Event Bus

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Set up AWS REST API Gateway to put events in EventBridge Event Bus

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3 min read

As the use of APIs continues to grow in modern software development, it is important to have an efficient way to manage and process these API events. Amazon Web Services (AWS) provides a powerful solution to this problem with its EventBridge service, which allows you to create event-driven architectures and easily process events. In this blog post, we will guide you through the process of setting up an AWS REST API Gateway to put events in an EventBridge event bus, with code samples to help you along the way.

Step 1: Set up an EventBridge Event Bus Before we can start processing events, we need to create an EventBridge event bus. To do this, go to the AWS Management Console and select the EventBridge service. From there, click on the "Event buses" tab and create a new event bus.

Step 2: Create an AWS REST API Gateway Now that we have an EventBridge event bus set up, we can create an AWS REST API Gateway. To do this, go to the AWS Management Console and select the API Gateway service. From there, click on "Create API" and select "REST API". Then choose "New API" and give it a name.

Step 3: Create a Resource and Method Once we have our API Gateway set up, we can create a resource and method for our API. To do this, go to the "Resources" section of your API Gateway and create a new resource. Then create a new method for that resource, and select "POST" as the HTTP method.

Step 4: Configure the Method Integration Next, we need to configure the method integration to send the event to the EventBridge event bus. To do this, select the method integration and choose "AWS Service" as the integration type. Then select "EventBridge" as the AWS service and choose "PutEvents" as the action.

Step 5: Set Up the Method Request and Response Finally, we need to set up the method request and response to properly handle the event. In the "Method Request" section, we need to add a new header parameter called "Content-Type" with a value of "application/json". In the "Integration Response" section, we need to set up the response mapping to properly handle the response from EventBridge.

Code Sample:

Here is a sample code snippet that demonstrates how to send an event to the EventBridge event bus using AWS SDK for JavaScript:

const AWS = require('aws-sdk');
const eventBridge = new AWS.EventBridge();

exports.handler = async (event) => {
  const params = {
    Entries: [
      {
        Source: 'my-api-gateway',
        DetailType: 'my-event-type',
        Detail: JSON.stringify(event.body),
        EventBusName: 'my-event-bus'
      }
    ]
  };
  await eventBridge.putEvents(params).promise();
  return {
    statusCode: 200,
    body: JSON.stringify({ message: 'Event sent successfully' })
  };
};

In this example, we are using the putEvents method of the EventBridge SDK to send an event to the specified event bus. We are also returning a successful response with a 200 status code and a message indicating that the event was sent successfully.

Conclusion:

Setting up an AWS REST API Gateway to put events in an EventBridge event bus is a powerful way to manage and process API events. With the steps outlined in this blog post and the sample code provided, you should be well on your way to setting up your own event-driven architecture in AWS. Give it a try and see how it can help you take your API event management to the next level!