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80 lines
2.4 KiB
80 lines
2.4 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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const ethUtil = require('ethereumjs-util')
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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.state.nativeCurrency.toLowerCase() : 'eth'
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const pairs = this._tokens.map(token => token.address).join(',')
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const query = `contract_addresses=${pairs}&vs_currencies=${nativeCurrency}`
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if (this._tokens.length > 0) {
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try {
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const response = await fetch(`https://api.coingecko.com/api/v3/simple/token_price/ethereum?${query}`)
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const prices = await response.json()
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this._tokens.forEach(token => {
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const price = prices[token.address.toLowerCase()] || prices[ethUtil.toChecksumAddress(token.address)]
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contractExchangeRates[normalizeAddress(token.address)] = price ? price[nativeCurrency] : 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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