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78 lines
2.3 KiB
78 lines
2.3 KiB
const ObservableStore = require('obs-store')
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const log = require('loglevel')
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const normalizeAddress = require('eth-sig-util').normalize
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// By default, poll every 3 minutes
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const DEFAULT_INTERVAL = 180 * 1000
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/**
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* A controller that polls for token exchange
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* rates based on a user's current token list
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*/
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class TokenRatesController {
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/**
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* Creates a TokenRatesController
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*
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* @param {Object} [config] - Options to configure controller
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*/
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constructor ({ interval = DEFAULT_INTERVAL, currency, preferences } = {}) {
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this.store = new ObservableStore()
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this.currency = currency
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this.preferences = preferences
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this.interval = interval
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}
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/**
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* Updates exchange rates for all tokens
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*/
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async updateExchangeRates () {
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if (!this.isActive) { return }
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const contractExchangeRates = {}
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const nativeCurrency = this.currency ? this.currency.getState().nativeCurrency.toUpperCase() : 'ETH'
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const pairs = this._tokens.map(token => `pairs[]=${token.address}/${nativeCurrency}`)
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const query = pairs.join('&')
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if (this._tokens.length > 0) {
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try {
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const response = await fetch(`https://exchanges.balanc3.net/pie?${query}&autoConversion=true`)
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const { prices = [] } = await response.json()
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prices.forEach(({ pair, price }) => {
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const address = pair.split('/')[0]
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contractExchangeRates[normalizeAddress(address)] = typeof price === 'number' ? price : 0
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})
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} catch (error) {
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log.warn(`MetaMask - TokenRatesController exchange rate fetch failed.`, error)
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}
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}
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this.store.putState({ contractExchangeRates })
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}
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/**
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* @type {Number}
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*/
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set interval (interval) {
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this._handle && clearInterval(this._handle)
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if (!interval) { return }
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this._handle = setInterval(() => { this.updateExchangeRates() }, interval)
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}
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/**
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* @type {Object}
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*/
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set preferences (preferences) {
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this._preferences && this._preferences.unsubscribe()
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if (!preferences) { return }
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this._preferences = preferences
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this.tokens = preferences.getState().tokens
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preferences.subscribe(({ tokens = [] }) => { this.tokens = tokens })
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}
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/**
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* @type {Array}
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*/
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set tokens (tokens) {
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this._tokens = tokens
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this.updateExchangeRates()
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}
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}
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module.exports = TokenRatesController
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