Writing better code for Dialogflow Webhooks - node.js

Question

I'm currently calling a fulfillment webhook with dialogflow in my node backend, performing crud operations on a firestore db. Is there a better, cleaner way to write these?
My code seems very poorly written but it works. I am striving to write cleaner more readable code so I'm looking for someone to give me some pointers on how to write better API calls with webhooks.
//DATABASE API CALLS HERE!//
case "FAV_COLOR":
agent.handleRequest(agent => {
return new Promise(() => {
async function writeToDb() {
// Get parameter from Dialogflow with the string to add to the database doc
const databaseEntry = agent.parameters.color;
// Get the database collection 'user' and document 'color' and store
// the document {entry: "<value of database entry>"} in the 'color' document
const dialogflowAgentRef = db.collection("user").doc("color");
try {
await db.runTransaction(transaction => {
transaction.set(dialogflowAgentRef, {
entry: databaseEntry
});
return Promise.resolve("Write complete");
});
agent.add(
`Wrote "${databaseEntry}" to the Firestore database.`
);
} catch (e) {
agent.add(
`Failed to write "${databaseEntry}" to the Firestore database.`
);
}
}
writeToDb();
});
});
break;
default:
console.log("ITS BROKEN");
It's currently inside a switch statement because I want to trigger different fulfillments based on actions. Both agent.add statements don't trigger at all.
Also, if someone could throw in some tips about debugging these I would really appreciate it. I've just been deploying the functions, adding a console.log(JSON.stringify()); and then checking in the firebase console functions section for errors. Seems incredibly inefficient.
Thanks for taking the time to answer :)
Jacks

Answer 1

Your index.js
const functions = require('firebase-functions');
const { WebhookClient } = require('dialogflow-fulfillment');
const welcome = require('./welcome')
const fallback = require('./fallback')
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));
let intentMap = new Map();
intentMap.set('Default Welcome Intent', welcome);
intentMap.set('Default Fallback Intent', fallback);
agent.handleRequest(intentMap);
});
You can split files like welcome, fallback
=> welcome.js
const welcome = (agent) => {
agent.add(`Welcome to my agent!`);
}
module.exports = welcome
=> fallback.js
const fallback = (agent) => {
agent.add(`I didn't understand`);
agent.add(`I'm sorry, can you try again?`);
}
module.exports = fallback
You can use same method with thie Example