Monday, 12 August 2019

Google Actions, Firebase and async/await


Example Google Actions function which requests, waits, and returns data from a website.
Note that this requires billing to be activated if the website is not a google resource.

Note that the async/await and particularly the async in red

'use strict';
const functions = require('firebase-functions');
const {WebhookClient} = require('dialogflow-fulfillment');
const fetch = require("node-fetch");
//
// Web Fetch function
//
async function getData(url) {
   try {
        const res =
await fetch(url) ;
        const txt =
await res.text() ;
        console.log("TEXT: " + txt) ;
        return txt ;
   } catch(err) {
        console.log("ERR: " + err) ;
        throw err.replace(url, "website") ;
   }
}
 
//
// Exported Functions
//
 
exports.dialogflowFirebaseFulfillment = functions.https.onRequest((request, response) => { 
  const agent = new WebhookClient({ request, response });
      // My Function Handler
  async function myfunction(agent) {
    var url="https://url.to.fetch/" ;
   
await getData(url).then((txt) => {
       console.log("DATA: " + txt) ;
       process txt
       agent.add(...) ;
    }).catch((err) => {
      console.log("FAILED: " + err) ;
      agent.add("Error - " + err);
    }) ;
  }

  //
  // Setup
  //
  let intentMap = new Map();
  //intentMap.set('Default Welcome Intent', welcome);
  //intentMap.set('Default Fallback Intent', fallback);
  intentMap.set('forecast', forecast) ;
  agent.handleRequest(intentMap);
});



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