Realm Mobile Platform PE — wit.ai NLP event handling demo

index.js

'use strict';

var fs = require('fs');
var Realm = require('realm');
const {Wit, log} = require('node-wit');



// Insert the Realm admin token
// Linux: `cat /etc/realm/admin_token.base64`
// macOS (from within zip): `cat realm-object-server/admin_token.base64`
var REALM_ADMIN_TOKEN = "YOUR_ADMIN_TOKEN";

// The URL to the Realm Object Server
var SERVER_URL = 'realm://YOUR_SERVER_IP:9080';
// or use the 9443 port for secure URLs:
// var SERVER_URL = 'realm://YOUR_SERVER_IP:9443';

// The path used by the global notifier to listen for changes across all
// Realms that match.
var NOTIFIER_PATH = ".*/realmtasks";

// Server access token from wit.ai API
var WIT_ACCESS_TOKEN = "WIT_ACCESS_TOKEN"

const client = new Wit({accessToken: WIT_ACCESS_TOKEN})

function isRealmObject(x) {
    return x !== null && x !== undefined && x.constructor === Realm.Object
}


var change_notification_callback = function(change_event) {
    let realm = change_event.realm;
    let changes = change_event.changes.Task;
    let taskIndexes = changes.modifications;

    console.log(changes);

    // Get the task objects to processes
    var tasks = realm.objects("Task");

    for (var i = 0; i < taskIndexes.length; i++) {
        let taskIndex = taskIndexes[i];
        // Retrieve the task object from the Realm with index
        let task = tasks[taskIndex];
        if (isRealmObject(task)) {
            console.log("New task received: " + change_event.path);
            console.log(JSON.stringify(task))

        	// get date from wit.ai
        	// probably use this https://wit.ai/docs/http/20160526#get--message-link
        	// node-wit: https://github.com/wit-ai/node-wit
        	const client = new Wit({accessToken: WIT_ACCESS_TOKEN});
			client.message(task.text, {}).then((data) => {
			  console.log('Yay, got Wit.ai response: ' + JSON.stringify(data));
			})
			.catch(console.error);

			// to write the date, we'll have to add a date property on the client and migrate it
            // realm.write(function() {
            //     task.date = ;
            // });

	      }
    }
};

//Create the admin user
var admin_user = Realm.Sync.User.adminUser(REALM_ADMIN_TOKEN);

//Callback on Realm changes
Realm.Sync.addListener(SERVER_URL, admin_user, NOTIFIER_PATH, 'change', change_notification_callback);

console.log('Listening for Realm changes across: ' + NOTIFIER_PATH);
// End of index.js

package.json

{
  "name": "TaskApp",
  "version": "0.0.1",
  "description": "Perform NLP with event handling.",
  "main": "index.js",
  "author": "Realm",
  "dependencies": {
    "node-wit": "^4.2.0",
    "realm": "file:realm-professional.tgz"
  }
}