如何在对话框流中使用异步函数？

Question

我收到错误，因为“异步函数”仅在 es8 中可用（使用“esversion 8”）” 我尝试在内联代码 package.json 中放入“esversion:8”，但它不起作用，并且函数未部署。

代码： index.js

'use strict';
'use esversion: 8'; //not working

async function getWeather() {
      const city = 'Mumbai';
      const OPENWEATHER_API_KEY = '<API KEY>';


      const response = await fetch(`http://api.openweathermap.org/data/2.5/weather?q=${city}&appid=${OPENWEATHER_API_KEY}`);
      const data = await response.json();
      console.log(data);

      const { main } = data;
      const { temp } = main;
      const kelvin = temp;
      const celsius = Math.round(kelvin - 273.15);

      console.log(celsius);
   }

代码package.json

{
  "name": "dialogflowFirebaseFulfillment",
  "description": "This is the default fulfillment for a Dialogflow agents using Cloud Functions for Firebase",
  "version": "0.0.1",
  "private": true,
  "license": "Apache Version 2.0",
  "author": "Google Inc.",
  "engines": {
    "node": "8"
  },
  "scripts": {
    "start": "firebase serve --only functions:dialogflowFirebaseFulfillment",
    "deploy": "firebase deploy --only functions:dialogflowFirebaseFulfillment"
  },
  "dependencies": {
    "actions-on-google": "^2.2.0",
    "firebase-admin": "^5.13.1",
    "firebase-functions": "^2.0.2",
    "dialogflow": "^0.6.0",
    "dialogflow-fulfillment": "^0.5.0",
    "esversion":"8"  //not working
  }
}

错误截图

有没有办法解决这个问题或者有其他方法吗？

Answer 1

您可以将函数从 async/await 转换为基于 Promise 的函数，您可以将函数体包装在 Promise 中，并使用 .then() 和 .catch() 分别处理已解决和已拒绝状态。

function getWeather() { 
  return new Promise((resolve, reject) => {
  const city = 'Mumbai';
  const OPENWEATHER_API_KEY = '<API KEY>';

  fetch(`http://api.openweathermap.org/data/2.5/weather?q=${city}&appid=${OPENWEATHER_API_KEY}`)
  .then(response => response.json())
  .then(data => {
    console.log(data);

    const { main } = data;
    const { temp } = main;
    const kelvin = temp;
    const celsius = Math.round(kelvin - 273.15);

    console.log(celsius);

    resolve(celsius); // Resolve the Promise with the celsius value.
  })
  .catch(error => {
    console.error(error);
    reject(error); // Reject the Promise with the error if any occurs.
      });
  });
}

然后你可以这样使用它：

   function WeatherInfoMessage(agent){
   return getWeather(agent)
   .then(celsius => {
            // Use the celsius value here when the Promise is resolved.
          })
   .catch(error => {
            // Handle the error here when the Promise is rejected.
          });      
  }

然后，将意图映射设置为 WeatherInfoMessage()

  intentMap.set('get weather', WeatherInfoMessage);