A Metamask fork with Infura removed and default networks editable
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
ciphermask/app/scripts/controllers/detect-tokens.js

167 lines
4.3 KiB

import Web3 from 'web3'
import contracts from 'eth-contract-metadata'
import { warn } from 'loglevel'
import { MAINNET } from './network/enums'
// By default, poll every 3 minutes
7 years ago
const DEFAULT_INTERVAL = 180 * 1000
import SINGLE_CALL_BALANCES_ABI from 'single-call-balance-checker-abi'
const SINGLE_CALL_BALANCES_ADDRESS = '0xb1f8e55c7f64d203c1400b9d8555d050f94adf39'
/**
* A controller that polls for token exchange
* rates based on a user's current token list
*/
class DetectTokensController {
/**
* Creates a DetectTokensController
*
* @param {Object} [config] - Options to configure controller
*/
constructor ({ interval = DEFAULT_INTERVAL, preferences, network, keyringMemStore } = {}) {
this.preferences = preferences
this.interval = interval
this.network = network
this.keyringMemStore = keyringMemStore
}
/**
* For each token in eth-contract-metada, find check selectedAddress balance.
*
*/
async detectNewTokens () {
if (!this.isActive) {
return
}
if (this._network.store.getState().provider.type !== MAINNET) {
return
}
const tokensToDetect = []
this.web3.setProvider(this._network._provider)
7 years ago
for (const contractAddress in contracts) {
if (contracts[contractAddress].erc20 && !(this.tokenAddresses.includes(contractAddress.toLowerCase()))) {
tokensToDetect.push(contractAddress)
}
}
let result
try {
result = await this._getTokenBalances(tokensToDetect)
} catch (error) {
warn(`MetaMask - DetectTokensController single call balance fetch failed`, error)
return
}
tokensToDetect.forEach((tokenAddress, index) => {
const balance = result[index]
if (balance && !balance.isZero()) {
this._preferences.addToken(tokenAddress, contracts[tokenAddress].symbol, contracts[tokenAddress].decimals)
}
})
}
async _getTokenBalances (tokens) {
const ethContract = this.web3.eth.contract(SINGLE_CALL_BALANCES_ABI).at(SINGLE_CALL_BALANCES_ADDRESS)
return new Promise((resolve, reject) => {
ethContract.balances([this.selectedAddress], tokens, (error, result) => {
if (error) {
return reject(error)
}
return resolve(result)
})
})
}
/**
* Restart token detection polling period and call detectNewTokens
* in case of address change or user session initialization.
*
*/
restartTokenDetection () {
if (!(this.isActive && this.selectedAddress)) {
return
}
this.detectNewTokens()
this.interval = DEFAULT_INTERVAL
}
/**
* @type {Number}
*/
set interval (interval) {
this._handle && clearInterval(this._handle)
if (!interval) {
return
}
this._handle = setInterval(() => {
this.detectNewTokens()
}, interval)
}
/**
* In setter when selectedAddress is changed, detectNewTokens and restart polling
* @type {Object}
*/
set preferences (preferences) {
if (!preferences) {
return
}
this._preferences = preferences
const currentTokens = preferences.store.getState().tokens
this.tokenAddresses = currentTokens
? currentTokens.map((token) => token.address)
: []
preferences.store.subscribe(({ tokens = [] }) => {
this.tokenAddresses = tokens.map((token) => {
return token.address
})
})
preferences.store.subscribe(({ selectedAddress }) => {
if (this.selectedAddress !== selectedAddress) {
this.selectedAddress = selectedAddress
this.restartTokenDetection()
}
})
}
/**
* @type {Object}
*/
set network (network) {
if (!network) {
return
}
this._network = network
this.web3 = new Web3(network._provider)
}
/**
* In setter when isUnlocked is updated to true, detectNewTokens and restart polling
* @type {Object}
*/
set keyringMemStore (keyringMemStore) {
if (!keyringMemStore) {
return
}
this._keyringMemStore = keyringMemStore
this._keyringMemStore.subscribe(({ isUnlocked }) => {
if (this.isUnlocked !== isUnlocked) {
this.isUnlocked = isUnlocked
if (isUnlocked) {
this.restartTokenDetection()
}
}
})
}
6 years ago
/**
* Internal isActive state
* @type {Object}
*/
get isActive () {
return this.isOpen && this.isUnlocked
}
}
export default DetectTokensController