cloudformation中的自定义功能不起作用

Posted 2023-03-04

【中文标题】cloudformation中的自定义功能不起作用

【英文标题】：Custom function in cloudformation does not work

【发布时间】：2018-04-04 14:36:27

【问题描述】：

我需要在云形成中调用 lambda：

这是我的 yaml 模板：

#test-custom-func
AWSTemplateFormatVersion: "2010-09-09"
Parameters:
  project:
    Description: project
    Type: String
    ConstraintDescription: Any string
  EnvironmentApp:
    Description: EnvironmentApp
    Type: String
    ConstraintDescription: Any string
Description: ddddd
Resources:
  removeBucket:
    Type: Custom::Myfunction
    Properties:
      ServiceToken: arn:aws:lambda:us-east-1:xxxxxxxxx:function:test1

这里是测试 lambda 函数：

exports.handler = (event, context, callback) => 
// TODO implement
console.log("rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr");
callback(null, 'Hello from Lambda');
;

如您所见，一切都非常基础。当我运行 yaml 堆栈时，它永远不会被创建并保持在创建进行中状态，并且在很长一段时间后它会失败。

我在使用自定义函数时有什么遗漏吗？

【参考方案1】：

您需要明确向 CloudFormation 发送响应，而不是使用 callback 方法。

将我找到的这个 sn-p in the doc 插入到您的代码中：

// Send response to the pre-signed S3 URL 
function sendResponse(event, context, responseStatus, responseData) 

    var responseBody = JSON.stringify(
        Status: responseStatus,
        Reason: "See the details in CloudWatch Log Stream: " + context.logStreamName,
        PhysicalResourceId: context.logStreamName,
        StackId: event.StackId,
        RequestId: event.RequestId,
        LogicalResourceId: event.LogicalResourceId,
        Data: responseData
    );

    console.log("RESPONSE BODY:\n", responseBody);

    var https = require("https");
    var url = require("url");

    var parsedUrl = url.parse(event.ResponseURL);
    var options = 
        hostname: parsedUrl.hostname,
        port: 443,
        path: parsedUrl.path,
        method: "PUT",
        headers: 
            "content-type": "",
            "content-length": responseBody.length
        
    ;

    console.log("SENDING RESPONSE...\n");

    var request = https.request(options, function(response) 
        console.log("STATUS: " + response.statusCode);
        console.log("HEADERS: " + JSON.stringify(response.headers));
        // Tell AWS Lambda that the function execution is done  
        context.done();
    );

    request.on("error", function(error) 
        console.log("sendResponse Error:" + error);
        // Tell AWS Lambda that the function execution is done  
        context.done();
    );

    // write data to request body
    request.write(responseBody);
    request.end();

并在您的逻辑完成时调用sendResponse，如下所示：

var responseStatus = "SUCCESS";
var responseData = ;
sendResponse(event, context, responseStatus, responseData);