Question

我有一个用Nodejs编写的Alexa技能的Lambda函数。它对服务进行HTTP调用，并将输出返回给Alexa Skill。调用该技能时，将调用lambda，并进行HTTP调用。但是，在返回HTTP响应之前，lambda返回了，因此该技能没有得到答案。

下面是我的Lambda函数

var Alexa = require('ask-sdk');
var http = require('http');
var SKILL_NAME = 'Some Facts';

var GetNewFactHandler = {
  canHandle(handlerInput) {
  var request = handlerInput.requestEnvelope.request;
  return request.type === 'LaunchRequest'
  || (request.type === 'IntentRequest'
    && request.intent.name === 'GetNewFactIntent');
},
handle(handlerInput) {
    getTop("", (data)=>{
    let speechOutput = "The result is " + data;
        console.log("resp from lambda ", speechOutput)
        var respSpeak =  handlerInput.responseBuilder
        .speak(speechOutput)
        .withSimpleCard(SKILL_NAME, data)
        .getResponse();
        console.log("respSpeak ", respSpeak);
        return respSpeak;
    });
  },
};


function getTop(query, callback) {
   var options = {
        host: 'somehost',
        port: '8100',
        path: '/top',
        method: 'GET',
   };

    var req = http.request(options, res => {
        res.setEncoding('utf8');
        var responseString = "";

        res.on('data', chunk => {
            responseString = responseString + chunk;
        });

        res.on('end', () => {
            console.log("********",JSON.parse(responseString).Name);
            let respStr = JSON.parse(responseString).Name;
            callback(respStr);
        });

    });
    req.end();
}

在lambda日志中，我可以在getTop（）中看到日志。但是，lambda的响应会在收到HTTP调用的响应之前返回。我以为在回调中构建响应将确保仅在HTTP调用完成后才返回响应。但这似乎并非如此。如何解决？任何帮助表示赞赏。

Answer 1

Node.js在默认情况下为异步，这意味着在服务返回数据之前，将调用响应构建器。调用客户资料api获取电话号码时，我遇到了类似的问题，我使用 async-await 这样解决了该问题

async handle(handlerInput) {
    const { serviceClientFactory, responseBuilder } = handlerInput;
    try {
      const upsServiceClient = serviceClientFactory.getUpsServiceClient();
      const profileMobileObject = await upsServiceClient.getProfileMobileNumber();
     
      const profileMobile = profileMobileObject.phoneNumber;
      const speechResponse = `Hello your mobile number is, ${profileMobile}</say-as>`;
      const cardResponse = `Hello your mobile number is, ${profileMobile}`
      return responseBuilder
                      .speak(speechResponse)
                      .withSimpleCard(APP_NAME, cardResponse)
                      .getResponse();
    } catch (error) {
      console.log(JSON.stringify(error));
      if (error.statusCode == 403) {
        return responseBuilder
        .speak(messages.NOTIFY_MISSING_PERMISSIONS)
        .withAskForPermissionsConsentCard([MOBILE_PERMISSION])
        .getResponse();
      }
      console.log(JSON.stringify(error));
      const response = responseBuilder.speak(messages.ERROR).getResponse();
      return response;
    }
  },

启用功能异步，并在调用服务之前使用 await 。您也可以通过 Promises

Lambda函数未返回对Alexa技能的响应

1 个答案: