Lessons

Practical Lesson on Integrating SNS with SQS Queues

Introduction

In this practical lesson, we will explore how to integrate Amazon Simple Notification Service (SNS) with Amazon Simple Queue Service (SQS) Queues. This integration allows you to decouple the components of your application and enable asynchronous communication between them. We will use AWS Cloud Development Kit (CDK) with Typescript and AWS CLI commands to demonstrate the integration.

Setting up the Environment

Before we begin, make sure you have the following prerequisites:

  • An AWS account
  • AWS CLI installed and configured
  • Node.js and npm installed
  • AWS CDK installed

Creating an SNS Topic

First, let’s create an SNS topic using AWS CDK. Create a new CDK project and install the necessary dependencies.

cdk init app --language typescript
npm install @aws-cdk/aws-sns @aws-cdk/aws-sns-subscriptions

Next, define the SNS topic in your CDK stack.

import * as sns from '@aws-cdk/aws-sns';
import * as subs from '@aws-cdk/aws-sns-subscriptions';

const topic = new sns.Topic(this, 'MyTopic');

topic.addSubscription(new subs.EmailSubscription('your@email.com'));

Deploy the CDK stack to create the SNS topic.

cdk deploy

Creating an SQS Queue

Next, let’s create an SQS queue using AWS CLI commands. Run the following command to create an SQS queue.

aws sqs create-queue --queue-name MyQueue

Subscribing SQS Queue to SNS Topic

Now, let’s subscribe the SQS queue to the SNS topic we created earlier. Run the following command to get the ARN of the SNS topic.

aws sns list-topics

Copy the ARN of the SNS topic and run the following command to subscribe the SQS queue to the SNS topic.

aws sns subscribe --topic-arn <SNS_TOPIC_ARN> --protocol sqs --notification-endpoint <SQS_QUEUE_ARN>

Sending Messages to SNS Topic

To test the integration, let’s send a message to the SNS topic and verify that it is delivered to the SQS queue. Run the following command to publish a message to the SNS topic.

aws sns publish --topic-arn <SNS_TOPIC_ARN> --message "Hello, World!"

Receiving Messages from SQS Queue

Finally, let’s receive the message from the SQS queue. Run the following command to receive messages from the SQS queue.

aws sqs receive-message --queue-url <SQS_QUEUE_URL>

You should see the message “Hello, World!” in the response.

Conclusion

In this practical lesson, we learned how to integrate Amazon SNS with Amazon SQS Queues using AWS CDK with Typescript and AWS CLI commands. By decoupling components of your application and enabling asynchronous communication, you can build scalable and resilient systems. Key learnings from this lesson include creating SNS topics, SQS queues, subscribing queues to topics, sending messages to topics, and receiving messages from queues. Experiment with different configurations and explore advanced features to enhance your application’s architecture.

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