Steps to setup microservices with AWS Lambda

Here is a step-by-step guide to implementing microservices with AWS Lambda:

1. Define your microservices architecture: Determine the different microservices that you need to implement and how they will communicate with each other.
2. Create AWS Lambda functions for each microservice: Create a separate Lambda function for each microservice that you want to implement. Each function should be responsible for handling a specific task or process.
3. Create an API Gateway: Create an API Gateway to serve as the entry point for your microservices. This will allow external clients to communicate with your microservices.
4. Configure API Gateway endpoints: Configure endpoints for each microservice that you want to expose through the API Gateway. You can use different HTTP methods, such as GET, POST, PUT, or DELETE, to specify the type of operation that you want to perform.
5. Define API Gateway integration with Lambda functions: Configure the API Gateway to integrate with each Lambda function that you created earlier. This will enable the API Gateway to trigger the corresponding Lambda function when a client sends a request to the endpoint.
6. Test your microservices: Test each microservice by sending requests to the corresponding API Gateway endpoint. You can use tools like Postman or curl to send HTTP requests to your API Gateway.

Here is a sample code for a simple AWS Lambda function that returns a “Hello World” message:

import json

def lambda_handler(event, context):
    message = "Hello World"
    return {
        'statusCode': 200,
        'body': json.dumps(message)
    }

To create an AWS Lambda function, you can follow these steps:

1. Log in to the AWS Management Console and navigate to the Lambda service.
2. Click on “Create Function”.
3. Select “Author from scratch”.
4. Choose a name for your function and select “Python” as the runtime.
5. Choose an execution role with the necessary permissions to access other AWS services that your function needs.
6. Click on “Create Function”.
7. Add your code to the function editor.
8. Configure the trigger for your function. In this case, you can choose “API Gateway”.
9. Configure the API Gateway settings and click on “Create”.
10. Test your function by sending a request to the API Gateway endpoint.