theawesomenayak

terraform {
  required_providers {
    wavefront = {
      source = "terraform-providers/wavefront"
      version = "2.4.0"
    }
  }
  required_version = ">= 0.13"
}

theawesomenayak

PetStoreFunction:
  Type: AWS::Serverless::Function
  Properties:
    CodeUri: PetStoreFunction
    Handler: com.petstore.App::handleRequest
    Runtime: java11
    MemorySize: 512
    Environment:
      Variables:
        PARAM1: VALUE

theawesomenayak

return DynamoDbClient.builder()
    .endpointOverride(URI.create("http://localhost:4566"))
    .region(Region.US_WEST_1)
    .httpClient(ApacheHttpClient.builder().build())
    .build();

theawesomenayak

version: '3'
services:
  localstack:
    container_name: ${LOCALSTACK_DOCKER_NAME-localstack_main}
    image: localstack/localstack
    network_mode: bridge
    ports:
      - "4566:4566"
    environment:
      - SERVICES=dynamodb

theawesomenayak

try {
  final String httpMethod = input.getHttpMethod();
  if ("GET".equalsIgnoreCase(httpMethod)) {
    final List<Pet> pets = DependencyModule.PET_STORE_CLIENT.read();
    final String result = DependencyModule.OBJECT_MAPPER.writeValueAsString(pets);
    return response.withStatusCode(200).withBody(result);
  } else {
    final Pet pet = DependencyModule.OBJECT_MAPPER.readValue(input.getBody(), Pet.class);
    final String id = DependencyModule.PET_STORE_CLIENT.write(pet);
    return response.withStatusCode(200).withBody(id);

theawesomenayak

public final class DependencyModule {

  private static final DynamoDbClient DYNAMO_DB_CLIENT = dynamoDbClient();
  public static final PetStoreClient PET_STORE_CLIENT = new PetStoreClient(DYNAMO_DB_CLIENT);
  public static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();

  private static DynamoDbClient dynamoDbClient() {

    return DynamoDbClient.builder()
        .region(Region.US_WEST_1)

theawesomenayak

import software.amazon.awssdk.services.dynamodb.model.ScanRequest;
import software.amazon.awssdk.services.dynamodb.model.ScanResponse;

....

public List<Pet> read() {

  final ScanRequest scanRequest = ScanRequest.builder()
      .tableName("pet-store")
      .build();

theawesomenayak

import software.amazon.awssdk.services.dynamodb.model.AttributeValue;
import software.amazon.awssdk.services.dynamodb.model.PutItemRequest;

....

public String write(final Pet pet) {

  final String id = UUID.randomUUID().toString();
  final PutItemRequest putItemRequest = PutItemRequest.builder()
      .tableName("pet-store")

theawesomenayak

private final DynamoDbClient dynamoDbClient;

public PetStoreClient(final DynamoDbClient dynamoDbClient) {

  this.dynamoDbClient = dynamoDbClient;
}

theawesomenayak

<dependency>
  <groupId>software.amazon.awssdk</groupId>
  <artifactId>dynamodb</artifactId>
  <version>2.15.12</version>
</dependency>
<dependency>
  <groupId>software.amazon.awssdk</groupId>
  <artifactId>apache-client</artifactId>
  <version>2.5.12</version>
</dependency>