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node.js - 如何使用用 TypeScript 编写的 API Gateway 在 VS Code 中调试本地 AWS Lambda 函数？

问题描述

我们即将开始使用 Lambda 函数。
我们有必须使用 TypeScript 的技术限制。
当从 Postman 调用相关端点时，我希望能够在 VS Code 中调试我的 ts 文件。

所以，我们有如下的开发环境：

我已经使用sam initHello World 模板来生成初始文件夹结构。
我已经对其进行了增强（主要基于这篇文章）以使用 TypeScript。

文件夹结构

.
├── template.yaml
├── .aws-sam
├── .vscode
|   └── launch.json
├── events
├── hello-world
|   ├── dist
|       ├── app.js
|       └── app.js.map
|   ├── src  
|       └── app.ts
|   ├── package.json
|   └── tsconfig.json

template.yaml

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: >
  LambdaWithApiGateWayDebug

  Sample SAM Template for LambdaWithApiGateWayDebug

Resources:
  HelloWorldFunction:
    Type: AWS::Serverless::Function 
    Properties:
      CodeUri: hello-world/dist
      Handler: app.lambdaHandler
      Runtime: nodejs12.x
      Events:
        HelloWorld:
          Type: Api
          Properties:
            Path: /hello
            Method: get

tsconfig.json

{
  "compilerOptions": {
    "target": "ES2020",
    "module": "commonjs",
    "sourceMap": true,
    "outDir": "./dist",
    "strict": true,
    "noImplicitAny": true,
    "esModuleInterop": true,
    "sourceRoot": "./src",
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true
  },
  "include": ["src/**/*"],
  "exclude": ["node_modules", "**/*.spec.ts"]
}

package.json

{
  "name": "hello_world",
  "version": "1.0.0",
  "description": "hello world sample for NodeJS",
  "main": "app.js",
  "repository": "https://github.com/awslabs/aws-sam-cli/tree/develop/samcli/local/init/templates/cookiecutter-aws-sam-hello-nodejs",
  "scripts": {
    "compile": "tsc",
    "start": "sam local start-api -t ../template.yaml -p 5000 -d 5678"
  },
  "dependencies": {
    "@types/aws-lambda": "^8.10.64",
    "@types/node": "^14.14.10",
    "aws-sdk": "^2.805.0",
    "source-map-support": "^0.5.19",
    "typescript": "^4.1.2"
  }
}

app.ts

import { APIGatewayProxyEvent, APIGatewayProxyResult } from "aws-lambda";

export const lambdaHandler = async (event: APIGatewayProxyEvent): Promise<APIGatewayProxyResult> => {
    const queries = JSON.stringify(event.queryStringParameters);
    return {
      statusCode: 200,
      body: `Queries: ${queries}`
    }
}

app.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.lambdaHandler = void 0;
const lambdaHandler = async (event) => {
    const queries = JSON.stringify(event.queryStringParameters);
    return {
        statusCode: 200,
        body: `Queries: ${queries}`
    };
};
exports.lambdaHandler = lambdaHandler;
//# sourceMappingURL=app.js.map

app.js.map

{"version":3,"file":"app.js","sourceRoot":"./src/","sources":["app.ts"],"names":[],"mappings":";;;AAEO,MAAM,aAAa,GAAG,KAAK,EAAE,KAA2B,EAAkC,EAAE;IAC/F,MAAM,OAAO,GAAG,IAAI,CAAC,SAAS,CAAC,KAAK,CAAC,qBAAqB,CAAC,CAAC;IAC5D,OAAO;QACL,UAAU,EAAE,GAAG;QACf,IAAI,EAAE,YAAY,OAAO,EAAE;KAC5B,CAAA;AACL,CAAC,CAAA;AANY,QAAA,aAAa,iBAMzB"}

launch.json

{
    "version": "0.2.0",
    "configurations": [
        {
            "type": "node",
            "request": "attach",
            "name": "attach Program",
            "port": 5678,
            "address": "localhost",
            "localRoot": "${workspaceFolder}/hello-world/dist",
            "remoteRoot": "/var/task",
            "protocol": "inspector",
            "sourceMaps": true,
            "smartStep": true,
            "outFiles": ["${workspaceFolder}/hello-world/dist"]
        }
    ]
}

如你看到的：

所以，当我打电话时，npm run start它会打印以下输出：

> hello_world@1.0.0 start C:\temp\AWS\LambdaWithApiGateWayDebug\hello-world
> sam local start-api -t ../template.yaml -p 5000 -d 5678

Mounting HelloWorldFunction at http://127.0.0.1:5000/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
2020-12-08 11:40:48  * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)

当我通过 Postman 向端点发出请求时，控制台会扩展为以下文本：

Mounting C:\temp\AWS\LambdaWithApiGateWayDebug\hello-world\dist as /var/task:ro,delegated inside runtime container
START RequestId: 04d884cf-fa96-4d58-b41c-e4196e12de13 Version: $LATEST
Debugger listening on ws://0.0.0.0:5678/d6702717-f291-42cd-8056-22b9f029f4dd
For help, see: https://nodejs.org/en/docs/inspector

当我将 VS 代码附加到节点进程时，我只能调试app.js而不是app.ts.
控制台日志结束：

Debugger attached.
END RequestId: 04d884cf-fa96-4d58-b41c-e4196e12de13
REPORT RequestId: 04d884cf-fa96-4d58-b41c-e4196e12de13  Init Duration: 0.12 ms  Duration: 7064.19 ms    Billed Duration: 7100 ms        Memory Size: 128 MB     Max Memory Used: 128 MB
No Content-Type given. Defaulting to 'application/json'.
2020-12-08 11:40:58 127.0.0.1 - - [08/Dec/2020 11:40:58] "GET /hello HTTP/1.1" 200 -

问题

我应该改变什么才能调试我的app.ts而不是app.js？

标签： node.jstypescriptamazon-web-servicesaws-lambdaaws-sam-cli

解决方案

我写了一篇中篇文章，解释如何创建、调用和调试 TypeScript lambda 函数。请查看以下链接了解更多详情。

要求

1-创建一个nodejs12x；

  1. 创建一个nodejs12x lambda；

  2. 安装打字稿：npm i -g typescript

  3. 初始化打字稿：（tsc --init它将创建 tsconfig.json 文件）

  4. 将创建的 tsconfig.json 文件替换为以下代码：

    {
"compilerOptions": {
"module": "CommonJS",
"target": "ES2017",
"noImplicitAny": true,
"preserveConstEnums": true,
"outDir": "./built",
"sourceMap": true
},
"include": ["handler/**/*"],
"exclude": ["node_modules", "**/*.spec.ts"]
}

  5. 删除 app.js 文件；

  6. 在处理程序文件夹内的 TypeScript 代码中创建您的 lambda（您需要创建它）：

    import { 
 APIGatewayProxyEvent, 
 APIGatewayProxyResult 
} from "aws-lambda";

export const lambdaHandler = async (
  event: APIGatewayProxyEvent
): Promise<APIGatewayProxyResult> => {
  const queries = JSON.stringify(event.queryStringParameters);
  return {
    statusCode: 200,
    body: `Queries: ${queries}`
  }
}

  7. 调整 template.yaml。更改 lambda 的 CodeUri 路径：CodeUri: hello-world/built

  8. 安装所需的节点包：npm install typescript @types/aws-lambda @types/node -save-dev

  9. 包json：

    {
"name": "typescript_lambda",
"version": "1.0.0",
"description": "hello world sample for TypeScript",
"main": "app.js",
"repository": "https://github.com/jafreitas90/AWS",
"author": "Jorge Freitas",
"license": "JorgeFreitas Ltd :)",
"dependencies": {
},
"scripts": {
  "compile": "tsc"
},
"devDependencies": {
  "@types/aws-lambda": "^8.10.71",
  "@types/node": "^14.14.22",
  "aws-sdk": "^2.815.0",
  "typescript": "^4.1.3"
}
}

  10. npm 安装

  11. npm 运行编译

  12. 在 lambda 函数（TypeScript 代码）中设置断点。在左侧面板上选择调试，然后选择开始调试（顶部的绿色按钮）。就是这样:)

  13. 项目结构

在此处输入图像描述

请在我的教程中找到更多详细信息。

源代码

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