Ticker File Example with Faker and Realm

ticker.ts

import { Server } from './' // import { Server } from 'realm-object-server'
import * as faker from 'faker'
import * as Realm from 'realm'

const myNewServer = new Server({
    port: 9081
})
myNewServer.start()
    .then(() => {
        console.log('Started! on port 9081')
        getStarted()
    });

const TickerSchema: Realm.ObjectSchema = {
    name: 'Ticker',
    primaryKey: 'tickerSymbol',
    properties: {
        tickerSymbol: { type: 'string', optional: false },
        price: { type: 'float', optional: false },
        companyName: { type: 'string', optional: false },
    }
}

function generateRandomTickerSymbol(len: number, charSet: string = null) {
    charSet = charSet || 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
    let randomString = '';
    for (let i = 0; i < len; i++) {
        let randomPoz = Math.floor(Math.random() * charSet.length);
        randomString += charSet.substring(randomPoz, randomPoz + 1);
    }
    return randomString;
}

function getStarted() {

    Realm.Sync.User.login(`http://127.0.0.1:9081`, 'sampleuser', 'samplepassword', async (error, user) => {
        if (error) { 
            console.log(`Error logging in: ${error}`) 
            return
        }
        let realm = await Realm.open({
            sync: {
                url: `realm://127.0.0.1:9081/tickers`,
                user: user
            },
            schema: [TickerSchema],
        })
        let tickerResults = realm.objects('Ticker')
        if (tickerResults.length === 0) {
            realm.write(() => {
                for (let index = 0; index < 100; index++) {
                    realm.create('Ticker', {
                        tickerSymbol: generateRandomTickerSymbol(3),
                        price: faker.random.number({ min: 20, max: 2000 }),
                        companyName: faker.company.companyName()
                    }, true)
                }
            })
        }
        setInterval(() => {
            const randomTicker = tickerResults[Math.floor(Math.random() * tickerResults.length)]
            realm.write(() => {
                randomTicker["price"] = faker.random.number({ min: 20, max: 2000 })
            })
        }, 50)
    })
}