Dialogflow App Fulfilment via EXPRESS server on Cloud Functions

DialogflowApp

const {
  dialogflow,
  Permission,
  Suggestions,
  BasicCard
} = require("actions-on-google");


// Instantiate the Dialogflow client.
const app = dialogflow({ debug: true });


// Handlers go here..
app.intent("Default Welcome Intent", conv => {
   // handler for this intent
});

app.intent("Say_Something_Silly", conv => {
   // handler for this intent
});


module.exports = app;

index.js

"use strict";

const express = require("express");
const bodyParser = require("body-parser");
const functions = require("firebase-functions");


// clients
const dialogFlowApp = require("./DialogflowApp");
const expressApp = express().use(bodyParser.json());

// EXPRESS APP fulfillment route (POST). The entire dialogFlowApp object (incl its handlers) is the callback handler for this route.
expressApp.post("/", dialogFlowApp);


//  EXPRESS APP test route (GET)
expressApp.get("/", (req, res) => {
  res.send("CONFIRMED RECEIPT OF GET.");
});



/*
 *   LOCAL NGROK SERVER LOGIC. ENSURE that you "export IS_LOCAL_DEV=true" in terminal prior to start
 */
if (process.env.IS_LOCAL_DEV) {
  const PORT = 8000;
  expressApp.listen(PORT, () =>
    console.log(`*** SERVER RUNNING LOCALLY ON PORT ${PORT} ***`)
  );
} else {
  console.log("*** NOT LOCALLY SERVED - OR - LOCAL ENV VAR NOT SET  ****");
}

//EXPORT two endpoints:  one express app, one dialogflow app
exports.fulfillmentExpressServer = functions.https.onRequest(expressApp);
exports.dialogflowFirebaseFulfillment = functions.https.onRequest(dialogFlowApp);

package.json

"dependencies": {
    "actions-on-google": "^2.0.0",
    "body-parser": "^1.18.3",
    "express": "^4.16.4",
    "firebase-functions": "^2.2.0"
  },
  "devDependencies": {
    "ngrok": "^3.1.1"
  }