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98 lines
2.6 KiB
98 lines
2.6 KiB
import ObservableStore from 'obs-store'
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import log from 'loglevel'
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import { normalize as normalizeAddress } from 'eth-sig-util'
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import ethUtil from '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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export default 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({ 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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}
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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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const contractExchangeRates = {}
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const nativeCurrency = this.currency
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? this.currency.state.nativeCurrency.toLowerCase()
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: '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 window.fetch(
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`https://api.coingecko.com/api/v3/simple/token_price/ethereum?${query}`,
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)
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const prices = await response.json()
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this._tokens.forEach((token) => {
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const price =
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prices[token.address.toLowerCase()] ||
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prices[ethUtil.toChecksumAddress(token.address)]
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contractExchangeRates[normalizeAddress(token.address)] = price
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? price[nativeCurrency]
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: 0
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})
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} catch (error) {
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log.warn(
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`MetaMask - TokenRatesController exchange rate fetch failed.`,
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error,
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)
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}
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}
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this.store.putState({ contractExchangeRates })
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}
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/* eslint-disable accessor-pairs */
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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) {
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return
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}
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this._preferences = preferences
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this.tokens = preferences.getState().tokens
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preferences.subscribe(({ tokens = [] }) => {
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this.tokens = tokens
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})
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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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/* eslint-enable accessor-pairs */
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start(interval = DEFAULT_INTERVAL) {
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this._handle && clearInterval(this._handle)
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if (!interval) {
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return
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}
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this._handle = setInterval(() => {
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this.updateExchangeRates()
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}, interval)
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this.updateExchangeRates()
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}
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stop() {
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this._handle && clearInterval(this._handle)
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}
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}
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