AWS Lambda 中的 HTTP 请求不起作用/NodeJS

Question

我知道，这个话题经常被讨论。但是这些 post 要么很旧，要么不能解决我的问题。所以我尝试打开一个新的（其他）。我最近开始制作 Alexa Skills。所以现在我设法在（也是旧的）教程的帮助下设置我的 AWS Lambda 函数。第一步一切正常。所以现在我想向网站发送 GET 请求，只是为了获取状态代码。在下一步中，Alexa 应该会告诉我这段代码——但那是另一回事了。所以我试图用许多不同的代码片段来完成请求——但没有任何效果。阅读各种 post 后，我了解到代码运行速度比请求执行速度快。所以请求的答案永远不会出现在日志中。也就是说，我不能使用它。

这是我当前的代码：

exports.handler = async (event, context, callback) => {
  try {
    console.log(event)
    if (event.session.new) {
      console.log("new session");
    }
    switch (event.request.type) {
      case "LaunchRequest":
        console.log("LAUNCH REQUEST");
        context.succeed(
          generateResponse(
            buildSpeechletResponse("This is a launch request", true), {}
          )
        )
        break;
      case "IntentRequest":
        console.log("INTENT REQUEST")
        switch (event.request.intent.name) {
          case "checkConnection":
            console.log("INTENT CHECK CONNECTION")
            const https = require('https')
            let url = "xxx/xxx/bc/alexa"
            exports.handler = async function(event) {
              console.log("async function")
              const promise = new Promise(function(resolve, reject) {
                https.get(url, (res) => {
                  resolve(res.statusCode)
                }).on('error', (e) => {
                  reject(Error(e))
                })
              })
              return promise
            }
            context.succeed(null, generateResponse(
              buildSpeechletResponse("server answered with code " + this.statusCode, true), {}));
            break;
        }
      case ("SessionEndedRequest"):
        console.log("SESSION ENEDED REQUEST")
        break;
      default:
        context.fail(`INVALID REQUEST TYPE: ${event.request.type}`);
        break;
    }
  }
  catch (error) { context.fail(`Exception: ${error}`) }
}
// Helpers
buildSpeechletResponse = (outputText, shouldEndSession) => {
  console.log("buildSpeechletResponse");
  return {
    outputSpeech: {
      type: "PlainText",
      text: outputText
    },
    shouldEndSession: shouldEndSession
  }
};
generateResponse = (speechletResponse, sessionAttributes) => {
  console.log("generateResponse")
  return {
    version: "1.0",
    sessionAttributes: sessionAttributes,
    response: speechletResponse
  }
};

如果我通过 lambda 测试测试代码（包括来自 Alexa 的 JSON 来检查连接），日志如下所示。

14:48:14 开始 RequestId：c8790cd2-81c9-4b8e-98ac-91b2ae6493f6 版本：$LATEST
14:48:14 2020-02-13T14:48:14.802Z c8790cd2-81c9-4b8e-98ac-91b2ae6493f6 INFO { version: '1.0', session: { new: true, sessionId: 'amzn1.echo-api.session.0a26e495-1085-44e0-83f3-13937d026c1b', 应用程序: { applicationId: 'amzn1.ask.skill.42b0dea7-952e-4695-a3d2-ab951c98ac9c' }, 用户: { userId: 'amzn1.ask.account.AHKG3FP33CDNS5PBKQESKQ73PAWMYTB7PRL4A2UGJTG77NOGSKKQBG5QNKVZ
14:48:14 2020-02-13T14:48:14.802Z c8790cd2-81c9-4b8e-98ac-91b2ae6493f6 信息新会话
14:48:14 2020-02-13T14:48:14.802Z c8790cd2-81c9-4b8e-98ac-91b2ae6493f6 信息意图请求
14:48:14 2020-02-13T14:48:14.802Z c8790cd2-81c9-4b8e-98ac-91b2ae6493f6 信息意图检查连接
14:48:14 2020-02-13T14:48:14.964Z c8790cd2-81c9-4b8e-98ac-91b2ae6493f6 INFO buildSpeechletResponse
14:48:14 2020-02-13T14:48:14.964Z c8790cd2-81c9-4b8e-98ac-91b2ae6493f6 信息生成响应
14:48:15 2020-02-13T14:48:15.042Z c8790cd2-81c9-4b8e-98ac-91b2ae6493f6 信息会话已请求

据我所知，代码运行到 "INTENT CHECK CONNECTION"，但日志 "async function" 从未出现。那么这里发生了什么？代码是否被跳过？我如何设法获得最先进的工作 http 请求？（对不起，如果我的post不是"common way"。这也是我的第一个post）

Answer 1

In your code  exports.handler = async function(event) {} is the cause

exports.handler 始终在 AWS lambda 的入口函数中

我只是删除了这段代码

exports.handler = async (event, context, callback) => {
  try {
    console.log(event)
    if (event.session.new) {
      console.log("new session");
    }
    switch (event.request.type) {
      case "LaunchRequest":
        console.log("LAUNCH REQUEST");
        context.succeed(
          generateResponse(
            buildSpeechletResponse("This is a launch request", true), {}
          )
        )
        break;
      case "IntentRequest":
        console.log("INTENT REQUEST")
        switch (event.request.intent.name) {
          case "checkConnection":
            console.log("INTENT CHECK CONNECTION")
            const https = require('https')
            let url = "xxx/xxx/bc/alexa"

                https.get(url, (res) => {
                   context.succeed(null, generateResponse(
              buildSpeechletResponse("server answered with code " + res.statusCode, true), {}));
                }).on('error', (e) => {
// handle error here
                  reject(Error(e))
                })
              })


            break;
        }
      case ("SessionEndedRequest"):
        console.log("SESSION ENEDED REQUEST")
        break;
      default:
        context.fail(`INVALID REQUEST TYPE: ${event.request.type}`);
        break;
    }
  }
  catch (error) { context.fail(`Exception: ${error}`) }
}
// Helpers
buildSpeechletResponse = (outputText, shouldEndSession) => {
  console.log("buildSpeechletResponse");
  return {
    outputSpeech: {
      type: "PlainText",
      text: outputText
    },
    shouldEndSession: shouldEndSession
  }
};
generateResponse = (speechletResponse, sessionAttributes) => {
  console.log("generateResponse")
  return {
    version: "1.0",
    sessionAttributes: sessionAttributes,
    response: speechletResponse
  }
};

Answer 2

所以我想通了。我提供的代码几乎是正确的。请求函数需要封装到另一个函数中。通过微小的调整，它适用于以下代码：

    // HTTP Request Function
function httpGet(options) {
  const https = require('https');
  return new Promise(((resolve, reject) => {
    const request = https.request(options, (response) => {
      response.setEncoding('utf8');
      let returnData = '';
      if (response.statusCode < 200 || response.statusCode >= 300) {
        return reject(new Error(`${response.statusCode}: ${response.req.getHeader('host')} ${response.req.path}`));
      }
      response.on('data', (chunk) => {
        returnData += chunk;
      });
      response.on('end', () => {
        resolve(response.statusCode); //Fill response with status code
      });
      response.on('error', (error) => {
        reject(error);
      });
    });
    request.end();
  }));
}

AWS Lambda 中的 HTTP 请求不起作用/NodeJS

HTTP Request in AWS Lambda is not working / NodeJS

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amazon-web-services

node.js

aws-lambda

alexa-skill