Implemented get-list with a lambda

.gitignore

@@ -1,4 +1,3 @@
-*.js
 !jest.config.js
 *.d.ts
 node_modules

lambdas/get-list.js

@@ -0,0 +1,17 @@
+const DynamoDB = require('aws-sdk/clients/dynamodb');
+
+const DocumentClient = new DynamoDB.DocumentClient();
+const { POSTS_TABLE} = process.env;
+
+module.exports.handler = async (event, context) => {
+  console.log(event);
+  const resp = await DocumentClient.scan({
+    TableName: POSTS_TABLE,
+  }).promise();
+
+  console.log(resp.Items);
+
+  return resp.Items;
+
+  return [];
+};

lib/cdk-typescript-stack.ts

@@ -6,9 +6,14 @@ import { Construct } from 'constructs';
 import { 
   aws_cognito as cognito, 
   aws_dynamodb as dynamodb,
-  aws_lambda as lambda 
+  aws_ec2 as ec2,
+  aws_ecs as ecs,
+  aws_iam as iam,
+  aws_lambda as lambda
 } from 'aws-cdk-lib';
 
+import * as path from 'path';
+
 
 export class CdkTypescriptStack extends Stack {
   constructor(scope: Construct, id: string, props?: StackProps) {
@@ -20,6 +25,17 @@ export class CdkTypescriptStack extends Stack {
       replicationRegions: ['us-east-1']
     });
 
+    const getListLambda = new lambda.Function(this, 'CdkListFunction', {
+      runtime: lambda.Runtime.NODEJS_16_X,
+      code: lambda.Code.fromAsset('lambdas'),
+      handler: 'get-list.handler',
+      environment: {
+        POSTS_TABLE: postsTable.tableName
+      }
+    });
+
+    postsTable.grantReadData(getListLambda);
+
     const userPool = new cognito.UserPool(this, 'CdkAuth', {
       userPoolName: 'CdkAuth',
       selfSignUpEnabled: true,
@@ -55,15 +71,22 @@ export class CdkTypescriptStack extends Stack {
     });
 
     const postsDS = api.addDynamoDbDataSource('postsTable', postsTable);
+    const getListFunctionDS = api.addLambdaDataSource('getListFunction', getListLambda);
 
-    // get list of posts
-    postsDS.createResolver({
+    // get list of posts with a lambda
+    getListFunctionDS.createResolver({
       typeName: 'Query',
-      fieldName: 'getPosts',
-      requestMappingTemplate: appsync.MappingTemplate.dynamoDbScanTable(),
-      responseMappingTemplate: appsync.MappingTemplate.dynamoDbResultList()
+      fieldName: 'getPosts'
     });
 
+    // get list of posts
+    // postsDS.createResolver({
+    //   typeName: 'Query',
+    //   fieldName: 'getPosts',
+    //   requestMappingTemplate: appsync.MappingTemplate.dynamoDbScanTable(),
+    //   responseMappingTemplate: appsync.MappingTemplate.dynamoDbResultList()
+    // });
+
     // create post
     postsDS.createResolver({
       typeName: 'Mutation',