73 lines
1.7 KiB
JavaScript
73 lines
1.7 KiB
JavaScript
const ObservableStore = require('obs-store')
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const extend = require('xtend')
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// every ten minutes
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const POLLING_INTERVAL = 600000
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class CurrencyController {
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constructor (opts = {}) {
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const initState = extend({
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currentCurrency: 'USD',
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conversionRate: 0,
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conversionDate: 'N/A',
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}, opts.initState)
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this.store = new ObservableStore(initState)
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}
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//
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// PUBLIC METHODS
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//
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getCurrentCurrency () {
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return this.store.getState().currentCurrency
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}
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setCurrentCurrency (currentCurrency) {
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this.store.updateState({ currentCurrency })
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}
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getConversionRate () {
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return this.store.getState().conversionRate
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}
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setConversionRate (conversionRate) {
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this.store.updateState({ conversionRate })
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}
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getConversionDate () {
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return this.store.getState().conversionDate
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}
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setConversionDate (conversionDate) {
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this.store.updateState({ conversionDate })
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}
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updateConversionRate () {
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const currentCurrency = this.getCurrentCurrency()
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return fetch(`https://www.cryptonator.com/api/ticker/eth-${currentCurrency}`)
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.then(response => response.json())
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.then((parsedResponse) => {
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this.setConversionRate(Number(parsedResponse.ticker.price))
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this.setConversionDate(Number(parsedResponse.timestamp))
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}).catch((err) => {
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if (err) {
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console.warn('MetaMask - Failed to query currency conversion.')
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this.setConversionRate(0)
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this.setConversionDate('N/A')
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}
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})
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}
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scheduleConversionInterval () {
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if (this.conversionInterval) {
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clearInterval(this.conversionInterval)
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}
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this.conversionInterval = setInterval(() => {
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this.updateConversionRate()
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}, POLLING_INTERVAL)
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}
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}
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module.exports = CurrencyController
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