Merge pull request #3 from ajeetchaulagain/define-cdk-stack

Define a CDK stack with Lambda, API gateway

Author: ajeetchaulagain

.gitignore

@@ -3,6 +3,9 @@
 /node_modules
 /build
 
+# Lambda layer
+/layer/nodejs/node_modules
+
 # Logs
 logs
 *.log

infra/lib/infra-stack.ts

@@ -1,16 +1,39 @@
 import * as cdk from 'aws-cdk-lib/core';
 import { Construct } from 'constructs';
-// import * as sqs from 'aws-cdk-lib/aws-sqs';
+import * as lambda from 'aws-cdk-lib/aws-lambda';
+import * as apigwv2 from 'aws-cdk-lib/aws-apigatewayv2';
+import * as integrations from 'aws-cdk-lib/aws-apigatewayv2-integrations';
+import * as path from 'path';
 
 export class InfraStack extends cdk.Stack {
   constructor(scope: Construct, id: string, props?: cdk.StackProps) {
     super(scope, id, props);
 
-    // The code that defines your stack goes here
+    const nodeModulesLayer = new lambda.LayerVersion(this, 'NodeModulesLayer', {
+      code: lambda.Code.fromAsset(path.join(__dirname, '../../layer')),
+      compatibleRuntimes: [lambda.Runtime.NODEJS_20_X],
+      description: 'Production node_modules for NestJS Lambda',
+    });
 
-    // example resource
-    // const queue = new sqs.Queue(this, 'InfraQueue', {
-    //   visibilityTimeout: cdk.Duration.seconds(300)
-    // });
+    const nestApiLambda = new lambda.Function(this, 'NestApiLambdaFunction', {
+      runtime: lambda.Runtime.NODEJS_20_X,
+      handler: 'src/lambda.handler',
+      code: lambda.Code.fromAsset(path.join(__dirname, '../../dist'), {
+        exclude: ['infra', 'tsconfig*'],
+      }),
+      memorySize: 512,
+      layers: [nodeModulesLayer],
+    });
+
+    const httpApi = new apigwv2.HttpApi(this, 'HttpApi', {
+      defaultIntegration: new integrations.HttpLambdaIntegration(
+        'LambdaIntegration',
+        nestApiLambda,
+      ),
+    });
+
+    new cdk.CfnOutput(this, 'HttpApiUrl', {
+      value: httpApi.url!,
+    });
   }
 }

package.json

@@ -17,7 +17,8 @@
     "test:watch": "jest --watch",
     "test:cov": "jest --coverage",
     "test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
-    "test:e2e": "jest --config ./test/jest-e2e.json"
+    "test:e2e": "jest --config ./test/jest-e2e.json",
+    "build:lambda-layer": "cp package.json package-lock.json layer/nodejs/ && npm ci --prefix layer/nodejs --omit=dev && rm layer/nodejs/package.json layer/nodejs/package-lock.json"
   },
   "dependencies": {
     "@codegenie/serverless-express": "^4.17.1",