tornadocash/tornado-relayer
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refactor + coingecko

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This commit is contained in:
Roman Storm 2019-11-23 00:18:54 -08:00
parent db35a0cbcc
commit b5609c30c5
10 changed files with 3399 additions and 124 deletions
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17
abis/ETHDAIOracle.json
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@ -1,17 +0,0 @@
[
{
"constant": true,
"inputs": [],
"name": "getMedianPrice",
"outputs": [
{
"internalType": "uint256",
"name": "",
"type": "uint256"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
}
]

5
config.js
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@ -14,6 +14,7 @@ module.exports = {
} ],
defaultGasPrice: 2,
gasOracleUrls: ['https://www.etherchain.org/api/gasPriceOracle', 'https://gasprice.poa.network/'],
ethdaiAddress: '0x7Ef645705cb7D401C5CD91a395cfcc3Db3C93689',
port: process.env.APP_PORT
port: process.env.APP_PORT,
//dai
tokens: ['0x6b175474e89094c44da98b954eedeac495271d0f']
}

5
package.json
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@ -4,13 +4,14 @@
"description": "Relayer for Tornado mixer. https://tornado.cash",
"main": "index.js",
"scripts": {
"start": "node index.js",
"start": "node src/index.js",
"eslint": "npx eslint --ignore-path .gitignore .",
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "Alexey Pertsev <alexey@peppersec.com> (https://peppersec.com)",
"author": "tornado.cash",
"license": "MIT",
"dependencies": {
"coingecko-api": "^1.0.6",
"dotenv": "^8.2.0",
"express": "^4.17.1",
"node-fetch": "^2.6.0",

69
src/Fetcher.js Normal file
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@ -0,0 +1,69 @@
const CoinGecko = require('coingecko-api')
const fetch = require('node-fetch')
const { gasOracleUrls, defaultGasPrice } = require('../config')
const { toWei } = require('web3-utils')
const { tokens } = require('../config')
class Fetcher {
constructor(web3) {
this.web3 = web3
this.ethPrices = {
dai: '6700000000000000' // 0.0067
}
this.gasPrices = {
fast: defaultGasPrice
}
}
async fetchPrices() {
try {
const CoinGeckoClient = new CoinGecko()
const price = await CoinGeckoClient.simple.fetchTokenPrice({
contract_addresses: tokens,
vs_currencies: 'eth',
assetPlatform: 'ethereum'
})
const addressToSymbol = {
'0x6b175474e89094c44da98b954eedeac495271d0f': 'dai'
}
this.ethPrices = Object.entries(price.data).reduce((acc, token) => {
if (token[1].eth) {
acc[addressToSymbol[token[0]]] = toWei(token[1].eth.toString())
}
return acc
}, {})
setTimeout(() => this.fetchPrices(), 1000 * 30)
} catch(e) {
setTimeout(() => this.fetchPrices(), 1000 * 30)
}
}
async fetchGasPrice({ oracleIndex = 0 } = {}) {
oracleIndex = (oracleIndex + 1) % gasOracleUrls.length
try {
const response = await fetch(gasOracleUrls[oracleIndex])
if (response.status === 200) {
const json = await response.json()
if (json.slow) {
this.gasPrices.low = Number(json.slow)
}
if (json.safeLow) {
this.gasPrices.low = Number(json.safeLow)
}
if (json.standard) {
this.gasPrices.standard = Number(json.standard)
}
if (json.fast) {
this.gasPrices.fast = Number(json.fast)
}
} else {
throw Error('Fetch gasPrice failed')
}
setTimeout(() => this.fetchGasPrice({ oracleIndex }), 15000)
} catch (e) {
setTimeout(() => this.fetchGasPrice({ oracleIndex }), 15000)
}
}
}
module.exports = Fetcher

49
src/index.js Normal file
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@ -0,0 +1,49 @@
const express = require('express')
const { netId, mixers, port } = require('../config')
const relayController = require('./relayController')
const { fetcher, web3 } = require('./instances')
const app = express()
app.use(express.json())
app.use((err, req, res, next) => {
if (err) {
console.log('Invalid Request data')
res.send('Invalid Request data')
} else {
next()
}
})
app.use(function(req, res, next) {
res.header('Access-Control-Allow-Origin', '*')
res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept')
next()
})
app.get('/', function (req, res) {
// just for testing purposes
res.send('This is <a href=https://tornado.cash>tornado.cash</a> Relayer service. Check the /status for settings')
})
app.get('/status', function (req, res) {
const { ethPrices, gasPrices } = fetcher
res.json({ relayerAddress: web3.eth.defaultAccount, mixers, gasPrices, netId, ethPrices })
})
app.post('/relay', relayController)
app.listen(port || 8000)
if (Number(netId) === 1) {
console.log('Gas price oracle started.')
fetcher.fetchGasPrice()
fetcher.fetchPrices()
}
console.log('Relayer started on port', port || 8000)
console.log(`relayerAddress: ${web3.eth.defaultAccount}`)
console.log(`mixers: ${JSON.stringify(mixers)}`)
console.log(`gasPrices: ${JSON.stringify(fetcher.gasPrices)}`)
console.log(`netId: ${netId}`)
console.log(`ethPrices: ${JSON.stringify(fetcher.ethPrices)}`)

8
src/instances.js Normal file
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@ -0,0 +1,8 @@
const Fetcher = require('./Fetcher')
const web3 = require('./setupWeb3')
const fetcher = new Fetcher(web3)
module.exports = {
fetcher,
web3
}

69
index.js → src/relayController.js
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@ -1,47 +1,15 @@
const { numberToHex, toWei, toHex, toBN, toChecksumAddress } = require('web3-utils')
const { netId, rpcUrl, privateKey, mixers, defaultGasPrice, port } = require('./config')
const { fetchGasPrice, isValidProof, isValidArgs, fetchDAIprice, isKnownContract, isEnoughFee } = require('./utils')
const Web3 = require('web3')
const express = require('express')
const mixerABI = require('../abis/mixerABI.json')
const {
isValidProof, isValidArgs, isKnownContract, isEnoughFee
} = require('./utils')
const app = express()
app.use(express.json())
const { web3, fetcher } = require('./instances')
app.use((err, req, res, next) => {
if (err) {
console.log('Invalid Request data')
res.send('Invalid Request data')
} else {
next()
}
})
app.use(function(req, res, next) {
res.header('Access-Control-Allow-Origin', '*')
res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept')
next()
})
const web3 = new Web3(rpcUrl, null, { transactionConfirmationBlocks: 1 })
const account = web3.eth.accounts.privateKeyToAccount('0x' + privateKey)
web3.eth.accounts.wallet.add('0x' + privateKey)
web3.eth.defaultAccount = account.address
const mixerABI = require('./abis/mixerABI.json')
const gasPrices = { fast: defaultGasPrice }
const ethPriceInDai = toWei('200')
app.get('/', function (req, res) {
// just for testing purposes
res.send('This is <a href=https://tornado.cash>tornado.cash</a> Relayer service. Check the /status for settings')
})
app.get('/status', function (req, res) {
res.json({ relayerAddress: web3.eth.defaultAccount, mixers, gasPrices, netId, ethPriceInDai })
})
app.post('/relay', async (req, resp) => {
async function relay (req, resp) {
const { proof, args, contract } = req.body
console.log(proof, args, contract)
const gasPrices = fetcher.gasPrices
let { valid , reason } = isValidProof(proof)
if (!valid) {
console.log('Proof is invalid:', reason)
@ -69,7 +37,7 @@ app.post('/relay', async (req, resp) => {
toBN(args[4]),
toBN(args[5])
]
console.log('root, nullifierHash, recipient, relayer, fee, refund', fee.toString(), refund)
if (currency === 'eth' && !refund.isZero()) {
return resp.status(400).json({ error: 'Cannot send refund for eth currency.' })
}
@ -105,8 +73,8 @@ app.post('/relay', async (req, resp) => {
})
gas += 50000
const { isEnough, reason } = isEnoughFee({ gas, gasPrices, currency, refund, ethPriceInDai, fee })
const ethPrices = fetcher.ethPrices
const { isEnough, reason } = isEnoughFee({ gas, gasPrices, currency, refund, ethPrices, fee })
if (!isEnough) {
console.log(`Wrong fee: ${reason}`)
return resp.status(400).json({ error: reason })
@ -130,19 +98,6 @@ app.post('/relay', async (req, resp) => {
console.log(e)
return resp.status(400).json({ error: 'Proof is malformed or spent.' })
}
})
app.listen(port || 8000)
if (Number(netId) === 1) {
fetchGasPrice({ gasPrices })
fetchDAIprice({ ethPriceInDai, web3 })
console.log('Gas price oracle started.')
}
console.log('Relayer started on port', port || 8000)
console.log(`relayerAddress: ${web3.eth.defaultAccount}`)
console.log(`mixers: ${JSON.stringify(mixers)}`)
console.log(`gasPrices: ${JSON.stringify(gasPrices)}`)
console.log(`netId: ${netId}`)
console.log(`ethPriceInDai: ${ethPriceInDai}`)
module.exports = relay

16
src/setupWeb3.js Normal file
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@ -0,0 +1,16 @@
const Web3 = require('web3')
const { rpcUrl, privateKey } = require('../config')
function setup() {
try {
const web3 = new Web3(rpcUrl, null, { transactionConfirmationBlocks: 1 })
const account = web3.eth.accounts.privateKeyToAccount('0x' + privateKey)
web3.eth.accounts.wallet.add('0x' + privateKey)
web3.eth.defaultAccount = account.address
return web3
} catch(e) {
console.error('web3 failed')
}
}
const web3 = setup()
module.exports = web3

52
utils.js → src/utils.js
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@ -1,46 +1,5 @@
const fetch = require('node-fetch')
const { isHexStrict, hexToNumberString, toBN, toWei } = require('web3-utils')
const { gasOracleUrls, ethdaiAddress, mixers } = require('./config')
const oracleABI = require('./abis/ETHDAIOracle.json')
async function fetchGasPrice({ gasPrices, oracleIndex = 0 }) {
oracleIndex = (oracleIndex + 1) % gasOracleUrls.length
try {
const response = await fetch(gasOracleUrls[oracleIndex])
if (response.status === 200) {
const json = await response.json()
if (json.slow) {
gasPrices.low = Number(json.slow)
}
if (json.safeLow) {
gasPrices.low = Number(json.safeLow)
}
if (json.standard) {
gasPrices.standard = Number(json.standard)
}
if (json.fast) {
gasPrices.fast = Number(json.fast)
}
} else {
throw Error('Fetch gasPrice failed')
}
setTimeout(() => fetchGasPrice({ gasPrices, oracleIndex }), 15000)
} catch (e) {
setTimeout(() => fetchGasPrice({ gasPrices, oracleIndex }), 15000)
}
}
async function fetchDAIprice({ ethPriceInDai, web3 }) {
try {
const ethDaiInstance = web3.eth.Contract(oracleABI, ethdaiAddress)
const price = await ethDaiInstance.methods.getMedianPrice().call()
ethPriceInDai = hexToNumberString(price)
setTimeout(() => fetchDAIprice({ ethPriceInDai, web3 }), 1000 * 30)
} catch(e) {
setTimeout(() => fetchDAIprice({ ethPriceInDai, web3 }), 1000 * 30)
}
}
const { isHexStrict, toBN, toWei } = require('web3-utils')
const { mixers } = require('../config')
function isValidProof(proof) {
// validator expects `websnarkUtils.toSolidityInput(proof)` output
@ -97,7 +56,7 @@ function sleep(ms) {
return new Promise(resolve => setTimeout(resolve, ms))
}
function isEnoughFee({ gas, gasPrices, currency, refund, ethPriceInDai, fee }) {
function isEnoughFee({ gas, gasPrices, currency, refund, ethPrices, fee }) {
const expense = toBN(toWei(gasPrices.fast.toString(), 'gwei')).mul(toBN(gas))
let desiredFee
switch (currency) {
@ -106,14 +65,15 @@ function isEnoughFee({ gas, gasPrices, currency, refund, ethPriceInDai, fee }) {
break
}
case 'dai': {
desiredFee = expense.add(refund).mul(toBN(ethPriceInDai)).div(toBN(10 ** 18))
desiredFee = expense.add(refund).mul(toBN(ethPrices.dai)).div(toBN(10 ** 18))
break
}
}
console.log('desired fee', desiredFee)
if (fee.lt(desiredFee)) {
return { isEnough: false, reason: 'Not enough fee' }
}
return { isEnough: true }
}
module.exports = { fetchGasPrice, isValidProof, isValidArgs, sleep, fetchDAIprice, isKnownContract, isEnoughFee }
module.exports = { isValidProof, isValidArgs, sleep, isKnownContract, isEnoughFee }

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