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https://github.com/kremalicious/metamask-extension.git
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6df17dc90e
Refs #9663 See [`accessor-pairs`][1] for more information. This change enables `accessor-pairs` and fixes the issues raised by the rule. [1]:https://eslint.org/docs/rules/accessor-pairs
168 lines
4.4 KiB
JavaScript
168 lines
4.4 KiB
JavaScript
import Web3 from 'web3'
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import contracts from 'eth-contract-metadata'
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import { warn } from 'loglevel'
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import SINGLE_CALL_BALANCES_ABI from 'single-call-balance-checker-abi'
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import { MAINNET } from './network/enums'
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// By default, poll every 3 minutes
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const DEFAULT_INTERVAL = 180 * 1000
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const SINGLE_CALL_BALANCES_ADDRESS = '0xb1f8e55c7f64d203c1400b9d8555d050f94adf39'
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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 DetectTokensController {
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/**
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* Creates a DetectTokensController
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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, preferences, network, keyringMemStore } = {}) {
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this.preferences = preferences
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this.interval = interval
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this.network = network
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this.keyringMemStore = keyringMemStore
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}
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/**
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* For each token in eth-contract-metadata, find check selectedAddress balance.
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*/
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async detectNewTokens () {
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if (!this.isActive) {
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return
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}
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if (this._network.store.getState().provider.type !== MAINNET) {
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return
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}
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const tokensToDetect = []
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this.web3.setProvider(this._network._provider)
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for (const contractAddress in contracts) {
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if (contracts[contractAddress].erc20 && !(this.tokenAddresses.includes(contractAddress.toLowerCase()))) {
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tokensToDetect.push(contractAddress)
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}
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}
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let result
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try {
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result = await this._getTokenBalances(tokensToDetect)
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} catch (error) {
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warn(`MetaMask - DetectTokensController single call balance fetch failed`, error)
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return
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}
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tokensToDetect.forEach((tokenAddress, index) => {
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const balance = result[index]
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if (balance && !balance.isZero()) {
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this._preferences.addToken(tokenAddress, contracts[tokenAddress].symbol, contracts[tokenAddress].decimals)
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}
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})
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}
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async _getTokenBalances (tokens) {
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const ethContract = this.web3.eth.contract(SINGLE_CALL_BALANCES_ABI).at(SINGLE_CALL_BALANCES_ADDRESS)
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return new Promise((resolve, reject) => {
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ethContract.balances([this.selectedAddress], tokens, (error, result) => {
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if (error) {
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return reject(error)
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}
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return resolve(result)
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})
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})
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}
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/**
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* Restart token detection polling period and call detectNewTokens
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* in case of address change or user session initialization.
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*
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*/
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restartTokenDetection () {
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if (!(this.isActive && this.selectedAddress)) {
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return
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}
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this.detectNewTokens()
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this.interval = DEFAULT_INTERVAL
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}
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/* eslint-disable accessor-pairs */
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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) {
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return
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}
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this._handle = setInterval(() => {
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this.detectNewTokens()
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}, interval)
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}
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/**
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* In setter when selectedAddress is changed, detectNewTokens and restart polling
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* @type {Object}
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*/
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set preferences (preferences) {
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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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const currentTokens = preferences.store.getState().tokens
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this.tokenAddresses = currentTokens
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? currentTokens.map((token) => token.address)
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: []
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preferences.store.subscribe(({ tokens = [] }) => {
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this.tokenAddresses = tokens.map((token) => {
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return token.address
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})
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})
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preferences.store.subscribe(({ selectedAddress }) => {
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if (this.selectedAddress !== selectedAddress) {
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this.selectedAddress = selectedAddress
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this.restartTokenDetection()
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}
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})
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}
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/**
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* @type {Object}
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*/
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set network (network) {
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if (!network) {
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return
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}
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this._network = network
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this.web3 = new Web3(network._provider)
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}
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/**
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* In setter when isUnlocked is updated to true, detectNewTokens and restart polling
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* @type {Object}
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*/
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set keyringMemStore (keyringMemStore) {
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if (!keyringMemStore) {
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return
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}
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this._keyringMemStore = keyringMemStore
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this._keyringMemStore.subscribe(({ isUnlocked }) => {
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if (this.isUnlocked !== isUnlocked) {
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this.isUnlocked = isUnlocked
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if (isUnlocked) {
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this.restartTokenDetection()
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}
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}
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})
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}
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/**
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* Internal isActive state
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* @type {Object}
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*/
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get isActive () {
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return this.isOpen && this.isUnlocked
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}
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/* eslint-enable accessor-pairs */
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}
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