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[TypeScript] AWS-CDK 備忘録

Last updated at Posted at 2019-10-08

普段はserverless frameworkを使用しているので備忘録として残す
気になる所があったら随時更新していく

AWS-CDK

インストール

GAはNode.js≧10.3.0以上じゃないといけない

npm i -g aws-cdk

cdk init

cdk initは空ディレクトリでないと実行出来ないので注意

mkdir test-cdk
cd test-cdk
cdk init app --language=typescript
npm i 

cdk.tsの実装

環境変数(direnvを使用)

direnv edit .
.envrc
export AWS_REGION=ap-northeast-1
export STAGE=dev

accountはcdk deploy --profile [aws profile]を使用するためコメントアウト
regionはデプロイしたいリージョンを指定する(環境変数で管理してる)

npm i @types/node
bin/test-cdk.ts
import 'source-map-support/register';
import cdk = require('@aws-cdk/core');
import {TestCdkStack} from '../lib/test-cdk-stack';

const app = new cdk.App();
new TestCdkStack(app, 'TestCdkStack', {
    env: {
        // account: '',
        region: process.env.AWS_REGION
    }
});
app.synth();

###Lambda Handlerの実装

npm i aws-lambda @types/aws-lambda
src/lambda/test.ts
import {APIGatewayEvent, Handler} from 'aws-lambda';

export const handler: Handler = async (event: APIGatewayEvent) => {
    let test: string = '';

    if (event.body != null) {
        const body = JSON.parse(event.body);
        test = body.test;
    } else {
        return {
            statusCode: 400,
            body: 'invalid request'
        };
    }

    return {
        statusCode: 200,
        body: test
    };
};

apigateway-lambdaの実装

npm i @aws-cdk/aws-lambda @aws-cdk/aws-apigateway
cdk.json
{
  "context": {
    "serviceName": "test"
  },
  "app": "npx ts-node bin/test-cdk.ts"
}

envに指定したstageの情報を持ってdev/prodの環境を分ける

lib/test-cdk-stack.ts
import * as cdk from '@aws-cdk/core';
import * as lambda from '@aws-cdk/aws-lambda';
import * as apiGateway from '@aws-cdk/aws-apigateway';

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

        const serviceName: string = this.node.tryGetContext("serviceName");
        const stage: string = process.env.STAGE ? process.env.STAGE : 'dev';

        const testLambda = new lambda.Function(this, 'testFunction', {
            functionName: `${serviceName}-${stage}`,
            code: new lambda.AssetCode('src/lambda'),
            handler: 'test.handler',
            runtime: lambda.Runtime.NODEJS_10_X,
            memorySize: 128,
            timeout: cdk.Duration.seconds(30),
            environment: {
                // lambda環境変数を指定する
                // STAGE: stage
            }
        });

        const api = new apiGateway.RestApi(this, 'testApi', {
            restApiName: `${serviceName}-service-${stage}`,
            // stageNameの情報を付与しないとEndpointが/prod/になってしまう
            deployOptions: {
                stageName: stage
            }
        });

        const root = api.root.addResource('tests');
        const testLambdaIntegration = new apiGateway.LambdaIntegration(testLambda);
        root.addMethod('POST', testLambdaIntegration);
    };
}

デプロイ

[aws profile]を適宜変更して実行

// cdk bootstrapを実行するのは一度だけでいい
cdk bootstrap --profile [aws profile]

// ビルド&デプロイ
npm run build
cdk deploy --profile [aws profile]

削除

cdk destroy --profile [aws profile]

注意点

name関連にデフォルト値が設定されている箇所が多いので、作成したい環境に合わせて設定していく必要がある

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