AWS Lambda is a compute service that runs code in response to events and automatically manages the compute resources required by that code. This tutorial describes how to use the AWS API Gateway to trigger a function using an HTTP request.
The aws lambda rest api without api gateway is a problem that many developers face when trying to use AWS Lambda functions. This article will show you how to create a lambda function using the AWS API Gateway.
We’ll learn how to utilize the AWS API Gateway as a trigger for an AWS Lambda function in this article. This course assumes that you are acquainted with AWS Lambda and how to create and deploy Serverless Applications.
Build and deploy a serverless Spring Boot web application using AWS Lambda as a prerequisite.
To begin, modify the pom.xml file to include the required maven dependencies.
org.springframework.boot org.springframework.cloud spring-boot-starter-web com.amazonaws aws-lambda-java-events spring-cloud-function-adapter-aws 2.0.2 aws-lambda-java-core com.amazonaws org.springframework.boot 1.1.0 spring-boot-starter-test is a test for spring-boot. junit-vintage-engine org.junit.vintage
Also, install the maven shade plugin to create a shaded jar for the Spring boot application we’ll be creating.
org.apache.maven.plugins false package shade maven-shade-plugin 3.2.4
Next, put the code below into the AWSLambdaDemoApplication.java file, which includes the main function.
@SpringBootApplication public class AWSLambdaDemoApplication public static void main(String args) SpringApplication.run(AWSLambdaDemoApplication.class, args); @SpringBootApplication public class AWSLambdaDemoApplication public static void main(String args) SpringApplication.run(AWSL
The next step is to build a Handler. The request is routed via an object of the class APIGatewayProxyRequestEvent in the com.amazonaws.services.lambda.runtime.events package, which is present in the com.amazonaws.services.lambda.runtime.events package. As a result, the handleRequest function’s first argument is an APIGatewayProxyRequestEvent object.
Create a new file called ServiceHandler.java and put the code below into it.
Import com.amazonaws.services.lambda.runtime.Context; import com.amazonaws.services.lambda.runtime.RequestHandler; import com.amazonaws.services.lambda.runtime.events.APIGatewayProxyRequestEvent; import com.amazonaws.services.lambd handleRequest is a public String that is overridden by @Override (APIGatewayProxyRequestEvent req, Context context) return “Lambda Function is called via the AWS API Gateway…”; context.getLogger().log(“Input: “);
The handler function’s return type is String. When called, it returns a String object.
At the conclusion of the lesson, we’ll double-check this.
The next step is to use the maven package command to create the deployment file. Create a Lambda function and submit the jar after that. Refer to the requirements section if you’re not sure how to accomplish it.
Adding an API Gateway Trigger
We’ll need to add a Trigger to the Lambda function once it’s ready. The API Gateway is what a Trigger is. Select ‘Add trigger’ from the Function overview tab.
- As the Trigger Configuration, choose API Gateway.
- Choose ‘Create an API’ for API, ‘HTTP API’ for API Type, and ‘Create an API’ for API.
- ‘Open’ for the sake of security.
You may give the Gateway API a unique name in the Additional settings page. You may also enable comprehensive analytics and set up cross-origin resource access. Then choose Add.
After that, go to the Function overview and click on API Gateway to see the list of Triggers. It’s also in the Triggers section of the Configuration tab.
The HTTP API endpoint is listed in the Trigger description. Select it by clicking on it. The notice ‘Lambda Function is called via the AWS API Gateway….’ appears in a new tab.
The Lambda function has now been successfully activated via an AWS API Gateway.
Click on ‘Network & Content Delivery’ under ‘all services’ to confirm that the API Gateway was successfully established. Go to API Gateway and choose it. The Trigger that you just generated is visible. To learn more about it, just click on it. If you wish, you may make changes to it.
This concludes the tutorial. I hope this has been of use to you. More tutorials will be coming soon.
The aws lambda call rest api python is a Lambda function that triggers when an event happens. It allows users to create an API Gateway rule for the function.
Frequently Asked Questions
How do I trigger lambda from API gateway?
You can trigger lambda using the following API call.
How do I pass data from API gateway to Lambda?
The data needs to be sent via a webhook. This is a function that can be set up to allow the API gateway to send information back to your application when certain events happen.
How do I trigger lambda function automatically?
To trigger a lambda function automatically, you must first define a list of conditions that will cause the function to be called.