Library SpringBoot - AWS Lambdas Functions

This repository uses Java, SpringBoot with AWS Lambdas Functions

• An AWS Lambda Function is required to run the test/app

• To use a Lambda Function is necessary to update the AWS properties in the files src/main/resources/application.properties and src/main/resources/application-dev.properties

    #AWS Keys
    amazon.aws.accesskey=<KEY>
    amazon.aws.secretkey=<SECRET_KEY>
    amazon.aws.region=<REGION>
    amazon.aws.amazonAWSFunctionARN=<FUNCTION_RESOURCE_NAME>
  

• To test execute ./mvnw clean test

• To run the app execute ./mvnw spring-boot:run

• Rest endpoints

  • GET: http://localhost:8080/api/notificacions/{name}/{phone}/{message}: Invoke the AWS Lambda Function

The code

In this repository to use AWS Lambdas in Java, it is necessary to add some dependencies, create a Lambda Client class

Dependencies (pom.xml file)

com.amazonaws::aws-java-sdk-s3
software.amazon.awssdk:lambda

The AWS Lambda Client class (org.hillmerch.library.service.NotificationClient)

A LambdaClient is created using AWS Account keys

	LambdaClient awsLambda = LambdaClient.builder()
    				.credentialsProvider( StaticCredentialsProvider.create( AwsBasicCredentials.create( amazonAWSAccessKey, amazonAWSSecretKey ) ) )
    				.region( region ).build();

Then, the payload with the parameters is created

SdkBytes payload = SdkBytes.fromUtf8String(
			"{ \"message\": " +
					"{\n" +
					" \"name\": \"" + name + "\",\n" +
					" \"phone\": \"" + phone + "\",\n" +
					" \"message\": \"" + message + "\"\n" +
					"}"
					+ "}" );

Then, an InvokeRequest using the function name, the parameters are send with the method payload

	InvokeRequest request = InvokeRequest.builder()
			.functionName( amazonAWSFuntionARN )
			.payload( payload )
			.build();

Finally, the Lambda function is invoked

	InvokeResponse res = awsLambda.invoke( request );

The Lambda Function

This example uses a Function created with Node, in this case the function return a string

exports.handler = async (event) => {
    const response = {
        statusCode: 200,
        body: JSON.stringify('Message sent: ' + event.message.name + '  ' + event.message.phone + ' ' + event.message.message),
    };
    return response;
};