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SAM CLI + CDK を試す

  • 基本的に このドキュメント に書いてあることを試しただけの記録
  • ドキュメントは Python だが、手元では Lambda Runtime: Node.js14.X, CDK: TypeScript で試した

aws-sam-cli-beta-cdk の導入

brew install aws-sam-cli-beta-cdk

Project の作成

以下のようにプロジェクトの作成が可能

sam-beta-cdk init --project-type CDK --package-type Zip --runtime nodejs14.x --dependency-manager npm --app-template hello-world --cdk-language typescript --name sam-cdk-demo cd sam-cdk-demo npm install

ディレクトリ構造は以下のとおり

$ tree . ├── README.md ├── bin │   └── aws-sam-cli-cdk-hello-world.ts ├── cdk.json ├── events │   └── event.json ├── hello-world │   ├── app.js │   └── package.json ├── jest.config.js ├── lib │   └── aws-sam-cli-cdk-hello-world-stack.ts ├── package-lock.json ├── package.json ├── test │   └── aws-sam-cli-cdk-hello-world.test.ts └── tsconfig.json

ローカル実行

プロジェクトの雛形には以下のような Lambda 関数が定義されている

$ cat hello-world/app.js exports.lambdaHandler = async (event, context) => { try { // const ret = await axios(url); response = { 'statusCode': 200, 'body': JSON.stringify({ message: 'hello world', // location: ret.data.trim() }) } } catch (err) { console.log(err); return err; } return response };

これをローカル実行するためにはあらかじめ Docker デーモンを走らせておき次のようなコマンドを叩く

$ sam-beta-cdk local invoke sam-cdk-demo/hello-world-lambda-function Synthesizing CDK App Invoking app.lambdaHandler (nodejs14.x) Image was not found. Building image............................................................................ .......................................................................................... .......................................................................................... Skip pulling image and use local one: amazon/aws-sam-cli-emulation-image-nodejs14.x:rapid-1.22.0.dev202107140310. Mounting /Users/.../sam-cdk-demo/hello-world as /var/task:ro,delegated inside runtime container START RequestId: 228a6eed-9a24-4d52-968f-c10a62d42cb7 Version: $LATEST END RequestId: 228a6eed-9a24-4d52-968f-c10a62d42cb7 REPORT RequestId: 228a6eed-9a24-4d52-968f-c10a62d42cb7 Init Duration: 0.13 ms Duration: 120.87 ms Billed Duration: 200 ms Memory Size: 128 MB Max Memory Used: 128 MB {"statusCode":200,"body":"{\"message\":\"hello world\"}"}

とてもお手軽!

API のローカル実行もお手軽

$ sam-beta-cdk local start-api Synthesizing CDK App Mounting helloworldlambdafunctionC39FFDF2 at http://127.0.0.1:3000/hello [GET] You can now browse to the above endpoints to invoke your functions. You do not need to restart/reload SAM CLI while working on your functions, changes will be reflected instantly/automatically. You only need to restart SAM CLI if you update your AWS SAM template 2021-08-13 03:52:35 * Running on http://127.0.0.1:3000/ (Press CTRL+C to quit) Invoking app.lambdaHandler (nodejs14.x) Skip pulling image and use local one: amazon/aws-sam-cli-emulation-image-nodejs14.x:rapid-1.22.0.dev202107140310. Mounting /Users/.../sam-cdk-demo/hello-world as /var/task:ro,delegated inside runtime container START RequestId: a82f1c11-cb94-4f60-8d4f-4728d7e39203 Version: $LATEST END RequestId: a82f1c11-cb94-4f60-8d4f-4728d7e39203 REPORT RequestId: a82f1c11-cb94-4f60-8d4f-4728d7e39203 Init Duration: 0.29 ms Duration: 218.70 ms Billed Duration: 300 ms Memory Size: 128 MB Max Memory Used: 128 MB No Content-Type given. Defaulting to 'application/json'. 2021-08-13 03:52:39 127.0.0.1 - - [13/Aug/2021 03:52:39] "GET /hello HTTP/1.1" 200 - 2021-08-13 03:52:39 127.0.0.1 - - [13/Aug/2021 03:52:39] "GET /favicon.ico HTTP/1.1" 403 -

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