如何使用 NodeJS 在本地测试 AWS Lambda 处理程序？

Question

我正在按照 these 说明创建一个在 Lambda 中执行的基本网络抓取工具。我有编写 selenium 代码的经验，但没有使用 Node JS 的经验。我在 Lambda 中获得了项目运行ning，但是当我尝试在本地编辑项目以执行我想要的 selenium 代码时，它不起作用。当我运行 node index.js 时，exports.handler 中的任何内容都不会执行。我将如何在本地执行该项目？谢谢！

Answer 1

在您的 index.js 中，刚刚定义并导出了一个处理函数，但没有人调用它。在 Lambda 环境中，一些 AWS 代码将使用消息调用此处理程序。在您的本地环境中，您必须自己调用您的处理程序。

你也可以看看 this doc，这是在本地环境中 "simulate" Lambda 的一种方式。

Answer 2

您需要从另一个文件调用您的处理函数让我们说 testHandler.js 以便运行通过 NodeJs。

这将像这样完成

//import your handler file or main file of Lambda
let handler = require('./handler');

//Call your exports function with required params
//In AWS lambda these are event, content, and callback
//event and content are JSON object and callback is a function
//In my example i'm using empty JSON
handler.handlerEvent( {}, //event
    {}, //content
    function(data,ss) {  //callback function with two arguments 
        console.log(data);
    });

现在您可以使用 node testHandler.js 来测试您的处理函数。

编辑：示例事件和内容数据 根据要求

事件：

{
    "resource": "/API/PATH",
    "path": "/API/PATH",
    "httpMethod": "POST",
    "headers": {
        "Accept": "*/*",
        "Accept-Encoding": "gzip, deflate, br",
        "Accept-Language": "en-GB,en-US;q=0.9,en;q=0.8",
        "cache-control": "no-cache",
        "CloudFront-Forwarded-Proto": "https",
        "CloudFront-Is-Desktop-Viewer": "true",
        "CloudFront-Is-Mobile-Viewer": "false",
        "CloudFront-Is-SmartTV-Viewer": "false",
        "CloudFront-Is-Tablet-Viewer": "false",
        "CloudFront-Viewer-Country": "IN",
        "content-type": "application/json",
        "Host": "url.us-east-1.amazonaws.com",
        "origin": "chrome-extension://fhbjgbiflinjbdggehcddcbncdddomop",
        "User-Agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36",
        "Via": "2.0 XXXXXXXXXXXXXX.cloudfront.net (CloudFront)",
        "X-Amz-Cf-Id": "XXXXXXXXXX51YYoOl75RKjAWEhCyna-fuQqEBjSL96TMkFX4H0xaZQ==",
        "X-Amzn-Trace-Id": "Root=1-XXX03c23-25XXXXXX948c8fba065caab5",
        "x-api-key": "SECUREKEY",
        "X-Forwarded-For": "XX.XX.XXX.XXX, XX.XXX.XX.XXX",
        "X-Forwarded-Port": "443",
        "X-Forwarded-Proto": "https"
    },
    "multiValueHeaders": {
        "Accept": [ "*/*" ],
        "Accept-Encoding": [ "gzip, deflate, br" ],
        "Accept-Language": [ "en-GB,en-US;q=0.9,en;q=0.8" ],
        "cache-control": [ "no-cache" ],
        "CloudFront-Forwarded-Proto": [ "https" ],
        "CloudFront-Is-Desktop-Viewer": [ "true" ],
        "CloudFront-Is-Mobile-Viewer": [ "false" ],
        "CloudFront-Is-SmartTV-Viewer": [ "false" ],
        "CloudFront-Is-Tablet-Viewer": [ "false" ],
        "CloudFront-Viewer-Country": [ "IN" ],
        "content-type": [ "application/json" ],
        "Host": [ "apiurl.us-east-1.amazonaws.com" ],
        "origin": [ "chrome-extension://fhbjgbiflinjbdggehcddcbncdddomop" ],
        "User-Agent": [ "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36" ],
        "Via": [ "2.0 XXXXXXXXXXXXXX.cloudfront.net (CloudFront)" ],
        "X-Amz-Cf-Id": [ "XXXXXXXXXhCyna-fuQqEBjSL96TMkFX4H0xaZQ==" ],
        "X-Amzn-Trace-Id": [ "Root=1-XXXXXXX67339948c8fba065caab5" ],
        "x-api-key": [ "SECUREAPIKEYPROVIDEDBYAWS" ],
        "X-Forwarded-For": [ "xx.xx.xx.xxx, xx.xxx.xx.xxx" ],
        "X-Forwarded-Port": [ "443" ],
        "X-Forwarded-Proto": [ "https" ]
    },
    "queryStringParameters": null,
    "multiValueQueryStringParameters": null,
    "pathParameters": null,
    "stageVariables": null,
    "requestContext": {
        "resourceId": "xxxxx",
        "resourcePath": "/api/endpoint",
        "httpMethod": "POST",
        "extendedRequestId": "xxXXxxXXw=",
        "requestTime": "29/Nov/2018:19:21:07 +0000",
        "path": "/env/api/endpoint",
        "accountId": "XXXXXX",
        "protocol": "HTTP/1.1",
        "stage": "env",
        "domainPrefix": "xxxxx",
        "requestTimeEpoch": 1543519267874,
        "requestId": "xxxxxxx-XXXX-xxxx-86a8-xxxxxa",
        "identity": {
            "cognitoIdentityPoolId": null,
            "cognitoIdentityId": null,
            "apiKey": "SECUREAPIKEYPROVIDEDBYAWS",
            "cognitoAuthenticationType": null,
            "userArn": null,
            "apiKeyId": "xxXXXXxxxxxx",
            "userAgent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36",
            "accountId": null,
            "caller": null,
            "sourceIp": "xx.xxx.xxx.xxx",
            "accessKey": null,
            "cognitoAuthenticationProvider": null,
            "user": null
        },
        "domainName": "url.us-east-1.amazonaws.com",
        "apiId": "xxxxx"
    },
    "body": "{\n    \"city\": \"Test 1 City\",\n    \"state\": \"NY\",\n    \"zipCode\": \"11549\"\n}",
    "isBase64Encoded": false
}

内容：

{
    "callbackWaitsForEmptyEventLoop": true,
    "logGroupName": "/aws/lambda/lambda-name",
    "logStreamName": "2018/11/29/[$LATEST]xxxxxxxxxxxb",
    "functionName": "lambda-name",
    "memoryLimitInMB": "1024",
    "functionVersion": "$LATEST",
    "invokeid": "xxxxx-xxx-11e8-xxx-xxxxxxxf9",
    "awsRequestId": "xxxxxx-xxxxx-11e8-xxxx-xxxxxxxxx",
    "invokedFunctionArn": "arn:aws:lambda:us-east-1:xxxxxxxx:function:lambda-name"
}

Answer 3

您可以查看lambda-local。它比上面接受的答案更漂亮。例如，它支持传递环境变量并为您的有效负载使用 JSON 文件。

Answer 4

这是我所做的：

index.js

exports.handler = async (event) => {
    console.log('hello world');

    const response = {
        statusCode: 200,
        body: JSON.stringify('Hello from Lambda!')
    };

    return response;
};

package.json

"scripts": {
  "locally": "node -e \"console.log(require('./index').handler(require('./event.json')));\""
}

event.json

{
  "Records": [
    {
      "eventVersion": "2.0",
      "eventSource": "aws:s3",
      "awsRegion": "eu-central-1",
      "eventTime": "1970-01-01T00:00:00.000Z",
      "eventName": "ObjectCreated:Put",
      "userIdentity": {
        "principalId": "AIDAJDPLRKLG7UEXAMPLE"
      },
      "requestParameters": {
        "sourceIPAddress": "127.0.0.1"
      },
      "responseElements": {
        "x-amz-request-id": "C3D13FE58DE4C810",
        "x-amz-id-2": "FMyUVURIY8/IgAtTv8xRjskZQpcIZ9KG4V5Wp6S7S/JRWeUWerMUE5JgHvANOjpD"
      },
      "s3": {
        "s3SchemaVersion": "1.0",
        "configurationId": "testConfigRule",
        "bucket": {
          "name": "my-bucket",
          "ownerIdentity": {
            "principalId": "A3NL1KOZZKExample"
          },
          "arn": "arn:aws:s3:::my-bucket"
        },
        "object": {
          "key": "HelloWorld.jpg",
          "size": 1024,
          "eTag": "d41d8cd98f00b204e9800998ecf8427e",
          "versionId": "096fKKXTRTtl3on89fVO.nfljtsv6qko"
        }
      }
    }
  ]
}

Shell

npm run locally

输出

> node -e "console.log(require('./index').handler({}));"

hello world
Promise { { statusCode: 200, body: '"Hello from Lambda!"' } }

Answer 5

如果你只想在本地执行它，你可以使用官方 sam cli 工具 https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-cli-command-reference-sam-local-invoke.html

如果您使用 VSCode，您还可以查看此扩展程序：

https://marketplace.visualstudio.com/items?itemName=bogdan-onu.invoke

Answer 6

也许是最简单的入门方法，经过一些测试（使用 Node 14.17.3）

let handler = require('./index.js');

handler.handler ( 
  {}, // event
  {}, // content 
  (error, result) => { 
     if (error) console.error(JSON.stringify(error, null, 2));
     else console.log(JSON.stringify(result, null, 2));
  }
);

如何使用 NodeJS 在本地测试 AWS Lambda 处理程序？

How to test AWS Lambda handler locally using NodeJS?

javascript

node.js

aws-lambda

serverless-framework