https模块在aws lambda函数中不起作用（用于Alexa Skill）[重复]

Question

我正在尝试从 aws lambda 函数调用 REST 服务，但执行并未触发回调函数内的代码。 REST 服务在独立的 node.js 服务器上运行良好。

在 CourseInfoIntent 中，我正在获取槽值并形成一个端点 url。我已经创建了带有所需值的 https_options_get。

exports.handler = function(event, context, callback){
  console.log("Course Info Skill Started");
  var alexa = Alexa.handler(event, context);
  alexa.APP_ID = APP_ID;
  alexa.registerHandlers(handlers);
  alexa.execute();
};

const handlers = {
  'LaunchRequest': function(){
    console.log("Inside Launch Request");
    this.emit('CourseInfoIntent');
  },
  'CourseInfoIntent': function(){
    // fetch the lesson id from data as per slot_type(Lesson) value
    console.log("Course Info Intent Started");
    //this.event.request.intent.slots.slotname.value for retrieving slot value from utterance
    var req_lesson = this.event.request.intent.slots.Lesson.value;
    console.log("Lesson Requested: " + req_lesson);
    var lessonId = data[req_lesson];
    console.log("Lesson ID: " + lessonId);
    path = path + '?LessonID='+lessonId;
    var url = "https://" + hostName + path;
    console.log("Rest url is :-> " + url);

    // create opyions for https request
    var https_options_get = {
      host: hostName,
      method: 'GET',
      path: path,
      headers: {
        'Content-Type': 'application/json'
      }
    };

    var result = getJson(https_options_get, function(err){
      console.log("Inside callback function");
      const speechOutput = "There has been an error with your request" + err;
      this.response.speak(speechOutput);
      this.emit(':responseReady');
    });
    const speechOutput = "The name of the lesson is " + result;
    const reprompt = "Do you like to know about more sessions? Answer Yes or No";
    this.response.speak(speechOutput).listen(reprompt);
    this.emit(':responseReady');
  }

getJson 函数用于使用 node.js https 模块进行 REST 调用。但是在 cloudwatch 中检查日志时，我只能看到日志，直到函数调用 var request = https.request(https_options_get, function (response) {} 后的“Inside new getJson function:”日志消息没有触发。

function getJson(https_options_get, context, callback) {
  console.log("Inside new getJson function: ");
  var request = https.request(https_options_get, function (response) {
      console.log('In GET Request Function block');
      var body = '';
      response.on('data', function (chunk) {
          body += chunk;
      });
      response.on('end', function () {
          var bodyJSON = JSON.parse(body);
          console.log('bodyJSON:-> ' + bodyJSON );
          var result = bodyJSON.LessonName;
          console.log('result:-> ' + result );
          return result;
      });
      response.on('error', callback);
  })
  .on('error', callback)
  .end();
  // end() should be placed above so that the control know we are done with the request and it can now send it to server
}

谁能告诉我这里做错了什么。

Answer 1

请不要返回结果。您应该使用回调来获取 HTTP 回调的结果，如下所示，

    var req = http.get('url', (res) => {
        var body = "";

        res.on("data", (chunk) => {
            body += chunk
        });

        res.on("end", () => {
            var result = JSON.parse(body);
           
            callBack(result)
        });
    }).on("error", (error) => {
        callBack(err);
});