返回twiml时出现Twilio节点VoiceResponse错误

问题描述

我写了一个twilio函数，它会吐出一些twiml来读出用户当前的天气。但是在代码之外的某个地方，twiml生成失败。

https://gist.github.com/machinshin/331efc2ab31277b98fcb343704d711e9

相关的代码位是第77-79行。

第77行的console.log将以下内容转储到stdin：

    twiml: <?xml version="1.0" encoding="UTF-8"?><Response><Say voice="Polly.Joanna">Hi</Say><Say voice="Polly.Joanna">According to OpenWeatherMap the station nearest Berkeley is currently scattered clouds
          with a temperature ranging from 57.6 Fahrenheit to 60.01 degrees Fahrenheit and a relative humidity of
          43% with an average wind speed of: 5.82 miles per hour</Say></Response>

然后，该框架会转储此操作的XML转换错误，但是据我所知，我所做的一切正确，是否有帮助/想法？

(node:20051) UnhandledPromiseRejectionWarning: TypeError: Converting circular structure to JSON
    --> starting at object with constructor 'XMLDocument'
    |     property 'children' -> object with constructor 'Array'
    |     index 0 -> object with constructor 'XMLDeclaration'
    --- property 'parent' closes the circle
    at JSON.stringify (<anonymous>)
    at stringify (/Users/vat/.twilio-cli/node_modules/express/lib/response.js:1123:12)
    at ServerResponse.json (/Users/vat/.twilio-cli/node_modules/express/lib/response.js:260:14)
    at ServerResponse.send (/Users/vat/.twilio-cli/node_modules/express/lib/response.js:158:21)
    at handleSuccess (/Users/vat/.twilio-cli/node_modules/twilio-run/dist/runtime/route.js:116:9)
    at callback (/Users/vat/.twilio-cli/node_modules/twilio-run/dist/runtime/route.js:164:13)
    at exports.handler (/Users/vat/workspace/machinshin/projects/idwresearch/dist/functions/get_say_weather.protected.js:71:16)
    at processticksAndRejections (internal/process/task_queues.js:97:5)
(node:20051) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block,or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection,use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:20051) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future,promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

解决方法

以下内容为我工作，没有错误：

const axios = require('axios');
const qs = require('querystring');

const jsLog = (obj) => (JSON.stringify(obj,null,2));

const voice = 'Polly.Joanna';
const OW_URL ='https://api.openweathermap.org/data/2.5/weather';

async function getWeatherForZipcode (OW_APP_ID,zipcode,countryCode,units) {

  const zip = (`${zipcode},${countryCode}`).toLowerCase().trim();
  return axios.get(OW_URL,{
    params: {
      appid: OW_APP_ID,units: units || 'imperial',zip,}
  }).then((res) => {
    return res.data;
  }).catch((err) => {
    console.error(`getWeatherForZipcode: error: ${jsLog(err)}`);
    throw new Error(err);
  });
}

/** parseWeatherResponse
 * @param
 *
 **/
function parseWeatherResponse(data) {
  return {
    current_conditions: data.weather[0].description,station_at: data.name,temp: data.main.temp,temp_max: data.main.temp_max,humidity: data.main.humidity,wind_speed: data.wind.speed,};
}

/** handler
 *  @param {Context} context
 *  @param {Event} event
 *  @param {ServerlessCallback} callback
 *  @returns {twiml.VoiceResponse}
 **/

exports.handler = async function (context,event,callback) {
  try {
    context.callbackWaitsForEmptyEventLoop = false;
    console.log(`-------------------\n`);
    const OW_APP_ID = context.OW_APP_ID;
    const { units,countryCode } = event;
    const z = zip.toLowerCase().trim();
    const cc =  countryCode.toLowerCase().trim();
    const uu = units.toLowerCase().trim();

    const response = await getWeatherForZipcode(OW_APP_ID,z,cc,uu);
    const toSay = parseWeatherResponse(response);
    
    // const twiml = new VoiceResponse();
    const twiml = new Twilio.twiml.VoiceResponse();

    const say = twiml.say({ voice: 'Polly.Joanna',},'Hi');
  
    twiml.say({voice},`According to OpenWeatherMap the station nearest ${toSay.station_at} is currently ${toSay.current_conditions}
    with a temperature ranging from ${toSay.temp} Fahrenheit to ${toSay.temp_max} degrees Fahrenheit and a relative humidity of
    ${toSay.humidity}% with an average wind speed of: ${toSay.wind_speed} miles per hour`);
    
    console.log(`twiml: ${twiml.toString()}`);
    
    return callback(null,twiml);
  } catch (err) {
    throw err;
    console.log(`some error was thrown: ${jsLog(err)}`);
    return callback(`err: ${jsLog(err)},event: ${jsLog(event)}`);
  }
}