cdk.js

import * as cdk from 'aws-cdk-lib';
import * as dynamodb from 'aws-cdk-lib/aws-dynamodb';
import * as apigateway from 'aws-cdk-lib/aws-apigateway';
import * as lambda from 'aws-cdk-lib/aws-lambda';
import * as appsync from 'aws-cdk-lib/aws-appsync';
import * as iam from 'aws-cdk-lib/aws-iam';

const { Stack, App, RemovalPolicy } = cdk;

class GraphQLAPIStack extends Stack {
  constructor(scope: cdk.Construct, id: string, props?: cdk.StackProps) {
    super(scope, id, props);

    // DynamoDB Table
    const table = new dynamodb.Table(this, 'ItemsTable', {
      partitionKey: { name: 'itemId', type: dynamodb.AttributeType.STRING },
      removalPolicy: RemovalPolicy.DESTROY, // For demo purposes; use retention policy in production
    });

    // Lambda Function
    const lambdaFunction = new lambda.Function(this, 'GraphQLLambda', {
      runtime: lambda.Runtime.NODEJS_14_X,
      handler: 'graphql.handler',
      code: lambda.Code.fromAsset('lambda'), // Path to your Lambda code
      environment: {
        DYNAMODB_TABLE_NAME: table.tableName,
      },
    });

    // Grant Lambda permissions to access DynamoDB
    table.grantReadWriteData(lambdaFunction);

    // API Gateway
    const api = new apigateway.RestApi(this, 'GraphQLAPI');

    // Lambda Integration
    const lambdaIntegration = new apigateway.LambdaIntegration(lambdaFunction, {
      proxy: true,
    });

    // API Gateway Endpoint
    const apiResource = api.root.addResource('graphql');
    apiResource.addMethod('POST', lambdaIntegration);

    // Output the API URL
    new cdk.CfnOutput(this, 'GraphQLAPIEndpoint', {
      value: api.url,
    });
  }
}

const app = new App();

new GraphQLAPIStack(app, 'GraphQLAPIStack');

app.synth();