tokenbridge/monitor/getBalances.js

97 lines
3.8 KiB
JavaScript

require('dotenv').config()
const BN = require('bignumber.js')
const Web3Utils = require('web3').utils
const logger = require('./logger')('getBalances')
const { BRIDGE_MODES } = require('../commons')
const { web3Home, web3Foreign, getHomeBlockNumber } = require('./utils/web3')
const {
MONITOR_HOME_START_BLOCK,
MONITOR_FOREIGN_START_BLOCK,
COMMON_HOME_BRIDGE_ADDRESS,
COMMON_FOREIGN_BRIDGE_ADDRESS
} = process.env
const { ERC20_ABI, BLOCK_REWARD_ABI, HOME_ERC_TO_NATIVE_ABI, FOREIGN_ERC_TO_NATIVE_ABI } = require('../commons')
async function main(bridgeMode, eventsInfo) {
const {
homeBlockNumber,
foreignBlockNumber,
homeToForeignConfirmations,
homeDelayedBlockNumber,
foreignDelayedBlockNumber
} = eventsInfo
// Events in the ./utils/events.js are fetched for different block ranges,
// In order to be consistent with the balance values, the following values might be needed
// Foreign balance should represent all UserRequestForAffirmation events up to block `N - requiredBlockConfirmation()`
// and all RelayedMessage events up to block `N`.
// This constant tells the difference between bridge balance at block `N - requiredBlockConfirmation() + 1`
// and the actual value monitor is interested in.
const lateForeignConfirmationsTotalValue = BN.sum(
0,
...homeToForeignConfirmations.filter(e => e.blockNumber > foreignDelayedBlockNumber).map(e => e.value)
)
const blockRanges = {
startBlockHome: MONITOR_HOME_START_BLOCK,
endBlockHome: homeBlockNumber,
startBlockForeign: MONITOR_FOREIGN_START_BLOCK,
endBlockForeign: foreignBlockNumber
}
if (bridgeMode === BRIDGE_MODES.ERC_TO_NATIVE) {
const foreignBridge = new web3Foreign.eth.Contract(FOREIGN_ERC_TO_NATIVE_ABI, COMMON_FOREIGN_BRIDGE_ADDRESS)
const erc20Address = await foreignBridge.methods.erc20token().call()
const erc20Contract = new web3Foreign.eth.Contract(ERC20_ABI, erc20Address)
logger.debug('calling erc20Contract.methods.balanceOf')
const foreignErc20Balance = await erc20Contract.methods
.balanceOf(COMMON_FOREIGN_BRIDGE_ADDRESS)
.call({}, foreignDelayedBlockNumber)
const homeBridge = new web3Home.eth.Contract(HOME_ERC_TO_NATIVE_ABI, COMMON_HOME_BRIDGE_ADDRESS)
logger.debug('calling homeBridge.methods.blockRewardContract')
const blockRewardAddress = await homeBridge.methods.blockRewardContract().call()
const blockRewardContract = new web3Home.eth.Contract(BLOCK_REWARD_ABI, blockRewardAddress)
const homeBlockNumber = await getHomeBlockNumber()
logger.debug('calling blockReward.methods.mintedTotally')
const mintedCoins = await blockRewardContract.methods
.mintedTotallyByBridge(COMMON_HOME_BRIDGE_ADDRESS)
.call({}, homeBlockNumber)
logger.debug('calling homeBridge.methods.totalBurntCoins')
const burntCoins = await homeBridge.methods.totalBurntCoins().call({}, homeDelayedBlockNumber)
const mintedCoinsBN = new BN(mintedCoins)
const burntCoinsBN = new BN(burntCoins)
const totalSupplyBN = mintedCoinsBN.minus(burntCoinsBN)
const foreignErc20BalanceBN = new BN(foreignErc20Balance).plus(lateForeignConfirmationsTotalValue)
const diff = foreignErc20BalanceBN.minus(totalSupplyBN).toFixed()
logger.debug('Done')
return {
home: {
totalSupply: Web3Utils.fromWei(totalSupplyBN.toFixed())
},
foreign: {
erc20Balance: Web3Utils.fromWei(foreignErc20Balance)
},
balanceDiff: Number(Web3Utils.fromWei(diff)),
...blockRanges,
lastChecked: Math.floor(Date.now() / 1000)
}
} else if (bridgeMode === BRIDGE_MODES.ARBITRARY_MESSAGE) {
return {
home: {},
foreign: {},
...blockRanges,
lastChecked: Math.floor(Date.now() / 1000)
}
} else {
throw new Error(`Unrecognized bridge mode: '${bridgeMode}'`)
}
}
module.exports = main