Lambda with Api Getaway in Typescript. Does it require Docker to synth locally?

[yuyokk]

Hi folks,

I have following code

"Stack" file

// lib/frontend-api.ts

import * as path from "path";
import {
  App,
  Stack,
  StackProps,
  aws_lambda_nodejs as lambdaNode,
  aws_apigateway as apiGetaway,
  CfnOutput,
} from "aws-cdk-lib";
import { Runtime } from "aws-cdk-lib/aws-lambda";

export class FrontendApiStack extends Stack {
  constructor(scope: App, id: string, props?: StackProps) {
    super(scope, id, props);

    const appCreateLambda = new lambdaNode.NodejsFunction(
      this,
      "ApplicationCreate",
      {
        entry: path.join(__dirname, "..", "lambda", "application-create.ts"),
        runtime: Runtime.NODEJS_16_X,
        depsLockFilePath: path.join(__dirname, "..", "package-lock.json"),
      }
    );

    const appCreateIntegration = new apiGetaway.LambdaIntegration(
      appCreateLambda
    );

    const api = new apiGetaway.RestApi(this, "FrontendApi");

    const applicationCreateEndpoint =
      api.root.addResource("application/create");
    applicationCreateEndpoint.addMethod("POST", appCreateIntegration);

    new CfnOutput(this, "RestApiName", {
      value: api.restApiName,
    });
  }
}

"Lambda code" file

// lambda/application-create.ts

import { APIGatewayProxyHandler } from "aws-lambda";

export const handler: APIGatewayProxyHandler = async (event) => {
  return {
    statusCode: 200,
    body: JSON.stringify({ event, message: "ok" }),
  };
};

"App entry point" file

// bin/app.ts

#!/usr/bin/env node
import "source-map-support/register";
import * as cdk from "aws-cdk-lib";
import { FrontendApiStack } from "../lib/frontend-api";

const app = new cdk.App();

new FrontendApiStack(app, "ApiStack");

When I try to synth getting following

$ cdk synth

Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
/Users/yuyokk/Desktop/cdk-fullstack-app/infrastructure/node_modules/aws-cdk-lib/core/lib/bundling.js:4
stderr: ${proc.stderr?.toString().trim()}`):new Error(`${prog} exited with status ${proc.status}`);return proc}function isSeLinux(){if(process.platform!="linux")return!1;const prog="selinuxenabled",proc=child_process_1.spawnSync(prog,[],{stdio:["pipe",process.stderr,"inherit"]});return proc.error?!1:proc.status==0}

Does it mean lambda with typescript requires to have Docker running? I have followed typescript example files https://github.com/aws-samples/aws-cdk-examples/tree/master/typescript and see no mentions about Docker. Also no any info about Docker on aws-cdk docs e.g. https://docs.aws.amazon.com/cdk/v2/guide/multiple_languages.html

Any help is appreciated.
Thank you

[yuyokk]

Updated "Stack" file to use lambda.Function instead of lambdaNode.NodejsFunction

// lib/frontend-api.ts

const appCreateLambda = new lambda.Function(
  this,
  "ApplicationCreateLambda",
  {
    runtime: Runtime.NODEJS_16_X,
    code: lambda.Code.fromAsset("lambda"),
    handler: "application-create.handler",
    timeout: Duration.seconds(30),
  }
);

and now it does not require Docker.

[yuyokk]

Ok I see why it happens :)

https://docs.aws.amazon.com/cdk/api/v1/docs/aws-lambda-nodejs-readme.html#local-bundling