Dialogflow NodeJs V2-Webhook方法调用在完成回调之前结束

Question

我正在使用 dialogflow-fulfillment-
nodejs

客户端开发Dialogflow
webhook，以查找城市的温度。在使用服务获取城市温度时，一切正常，还会生成正确的响应，但是即使调用正确的方法，也不会将响应发送给用户。

这是Dialogflow GitHub存储库中的问题

码

function getTemp(agent) {
    const timeStart = new Date().getTime();
    console.info(`temp function called`);
    // agent.add(`Temperature in New Delhi is 50 degree Celsius!`); // This works
    serviceRequest.getTemp("New Delhi", function(resp){
        if (resp['status'] === 'Y') {
            // success
            const msg = `Temperature in New Delhi is ${resp['temp']} Celsius!`;
            console.log(`Speech Response -- ${msg}`);
            console.log(`Type of msg -> ${typeof msg}`);
            agent.add(msg);
        } else {
            // failure
            agent.add(`There was some error with the backend. Please try again later.`);
        }
        const timeEnds = new Date().getTime();
        console.log("\nComplete 'getTemp' process took " + (timeEnds - timeStart) + " milliseconds.")
    });
    console.log("------ temperature function ends here ------");
}



'getTemp': function (city, callback) {
        let respBack = {};
        doTimeOutTest(function(resp){
            respBack['temp'] = resp;
            respBack['status'] = 'Y';
            callback(respBack);
        });

    }


function doTimeOutTest(callback){
    // below commented code takes < 10 ms to execute, but does not send any response back to dialogflow as call ends before it is executed
    // setTimeout(function() {
    //     callback("30 degree");
    // }, 1);

    // Below code works even when it takes more time to execute
    for(let i=0; i<10000; i++){
        for(let j=0; j<10000; j++){
            //
        }
    }
    callback("30 degree");
}

控制台日志

当注释的代码运行时

>>>>>>> S E R V E R   H I T <<<<<<<

temp function called
------ temperature function ends here ------
Speech Response -- Temperature in New Delhi is 30 degree Celsius!
Type of msg -> string

Complete 'getTemp' process took 10 milliseconds.

当未注释的代码运行时

>>>>>>> S E R V E R   H I T <<<<<<<

temp function called
Speech Response -- Temperature in New Delhi is 30 degree Celsius!
Type of msg -> string

Complete 'getTemp' process took 77 milliseconds.
------ temperature function ends here ------

NodeJS Dialogflow src代码链接-https: //github.com/dialogflow/dialogflow-
fulfillment-nodejs/blob/master/src/dialogflow-
fulfillment.js

Answer 1

您需要在处理函数中返回一个Promise。函数处理程序现在支持promise，因此您可以返回promise，并在promise中处理诸如http请求之类的事情。这是使用请求库的示例：

function dialogflowHanlderWithRequest(agent) {
  return new Promise((resolve, reject) => {
    request.get(options, (error, response, body) => {
      JSON.parse(body)
      // processing code
      agent.add(...)
      resolve();
    });
  });
};

您还可以将HTTP调用移至另一个返回Promise的函数。这是axios库的示例：

function dialogflowHandlerWithAxios(agent) {
  return callApi('www.google.com').then(response => {
    agent.add('My response');
  }).catch (error => {
    // do something
  })
};

function callApi(url) {
    return axios.get(url);
}