tickers.js

'use strict';

const moment = require('moment')

module.exports = class Tickers {
    constructor() {
        this.tickers = {};
    }

    set(ticker) {
        this.tickers[ticker.exchange + '.' + ticker.symbol] = ticker
    }

    get(exchange, symbol) {
        return this.tickers[exchange + '.' + symbol] || null
    }

    getIfUpToDate(exchange, symbol, lastUpdatedSinceMs) {
        if (!lastUpdatedSinceMs) {
            throw 'Invalid ms argument given'
        }

        if (!(exchange + '.' + symbol) in this.tickers) {
            return undefined;
        }

        return this.tickers[exchange + '.' + symbol].createdAt > moment().subtract(lastUpdatedSinceMs, 'ms').toDate()
            ? this.tickers[exchange + '.' + symbol]
            : undefined
    }

    all() {
        return this.tickers
    }
}