在 Dialogflow Fulfillment 中使用 3rd 方 API

问题描述

我有一个 Dialogflow 代理，我正在使用内联编辑器(由 Cloud Functions for Firebase 提供支持).当我尝试在 Intent 处理程序中嵌入 HTTPS GET 处理程序时，它会因日志条目忽略已完成函数的异常"而崩溃.也许有更好的方法可以通过承诺来做到这一点，但我对此并不陌生.我可以看到它确实在升级到 Blaze 计划后确实执行了外部查询，因此它不是计费帐户的限制.无论如何，这是代码:

I've got a Dialogflow agent for which I'm using the Inline Editor (powered by Cloud Functions for Firebase). When I try to embed an HTTPS GET handler within the Intent handler, it crashes with log entry "Ignoring exception from a finished function". Maybe there's a better way to do this with promises but I'm new to that. I can see that it does in fact execute the external query after upgrading to the Blaze plan so it's not a limitation of the billing account. Anyhow, here's the code:

'use strict';

const functions = require('firebase-functions');
//const rp = require('request-promise');
const {WebhookClient} = require('dialogflow-fulfillment');
const {Card, Suggestion} = require('dialogflow-fulfillment');

process.env.DEBUG = 'dialogflow:debug'; // enables lib debugging statements

exports.dialogflowFirebaseFulfillment = functions.https.onRequest((request, response) => {
  const agent = new WebhookClient({ request, response });
  console.log('Dialogflow Request headers: ' + JSON.stringify(request.headers));
  console.log('Dialogflow Request body: ' + JSON.stringify(request.body));

  function welcome(agent) {
    agent.add(`Welcome to my agent!`);
  }

  function fallback(agent) {
    agent.add(`I didn't understand`);
    agent.add(`I'm sorry, can you try again?`);
  }

  function findWidget(agent) {

    const https = require("https");
    const url = "https://api.site.com/sub?query=";

    agent.add(`Found a widget for you:`);

    var widgetName = getArgument('Name');

    https.get(url + widgetName, res => {
      res.setEncoding("utf8");
      let body = "";
      res.on("data", data => {
        body += data;
      });
      res.on("end", () => {

        body = JSON.parse(body);

        agent.add(new Card({
            title: `Widget ` + body.name,
            text: body.description,
            buttonText: 'Open link',
            buttonUrl: body.homepage
          })
        );
      });
    });
  }

// Run the proper function handler based on the matched Dialogflow intent name
let intentMap = new Map();
intentMap.set('Default Welcome Intent', welcome);
intentMap.set('Default Fallback Intent', fallback);
intentMap.set('Find Old Movie Intent', findOldMovie);
intentMap.set('Find Movie Intent', findMovie);
// intentMap.set('your intent name here', googleAssistantHandler);
agent.handleRequest(intentMap);
});

推荐答案

Promises 不仅仅是有一种更好"的方式来实现它——agent.handleRequest() 需要你如果您有任何异步调用的代码，请使用 Promises.问题是您的 findWidget 函数在 https.get 完成运行之前返回，因此最终不会发送回复.

It isn't just that there is a "better" way to do it with Promises - agent.handleRequest() requires you to use Promises if you have any code that is being called asynchronously. The issue is that your findWidget function is returning before the https.get finishes running, so the reply doesn't end up being sent.

我倾向于使用 request-promise-native 包来做 HTTP调用，因为它简化了许多事情.(但是，您可以自己将调用包装在 Promise 中.)因此，Promise 版本可能看起来像这样(未经测试):

I tend to use the request-promise-native package to do HTTP calls, since it simplifies many things. (However, you're free to wrap the call in a Promise yourself.) So the Promise version might look something like this (untested):

  var findWidget = function(agent) {

    const request = require('request-promise-native');
    const url = "https://api.site.com/sub?query=";

    agent.add(`Found a widget for you:`);

    var widgetName = getArgument('Name');

    return request.get( url+widgetName )
      .then( jsonBody => {
        var body = JSON.parse(jsonBody);
        agent.add(new Card({
          title: `Widget ` + body.name,
          text: body.description,
          buttonText: 'Open link',
          buttonUrl: body.homepage
        }));
        return Promise.resolve( agent );
      });
    });
  }

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