wip

.eslintrc.json

@@ -26,7 +26,7 @@
     "semi": ["error", "never"],
     "object-curly-spacing": ["error", "always"],
     "require-await": "error",
-    "comma-dangle": ["error", "never"],
+    "comma-dangle": ["error", "only-multiline"],
     "space-before-function-paren": [
       "error",
       {

config.js

@@ -2,15 +2,17 @@ require('dotenv').config()
 
 module.exports = {
   netId: Number(process.env.NET_ID) || 42,
-  redisUrl: process.env.REDIS_URL,
+  redisUrl: process.env.REDIS_URL || 'redis://127.0.0.1:6379',
   rpcUrl: process.env.RPC_URL || 'https://kovan.infura.io/',
   oracleRpcUrl: process.env.ORACLE_RPC_URL || 'https://mainnet.infura.io/',
   oracleAddress: '0xA2b8E7ee7c8a18ea561A5CF7C9C365592026E374',
+  minerAddress: '0x4c4C5cCC263A4531b90042561523c4a1Ad571751',
+  minerMerkleTreeHeight: 10,
   privateKey: process.env.PRIVATE_KEY,
-  mixers: {
+  instances: {
     netId1: {
       eth: {
-        mixerAddress: {
+        instanceAddress: {
           '0.1': '0x12D66f87A04A9E220743712cE6d9bB1B5616B8Fc',
           '1': '0x47CE0C6eD5B0Ce3d3A51fdb1C52DC66a7c3c2936',
           '10': '0x910Cbd523D972eb0a6f4cAe4618aD62622b39DbF',
@@ -20,7 +22,7 @@ module.exports = {
         decimals: 18
       },
       dai: {
-        mixerAddress: {
+        instanceAddress: {
           '100': '0xD4B88Df4D29F5CedD6857912842cff3b20C8Cfa3',
           '1000': '0xFD8610d20aA15b7B2E3Be39B396a1bC3516c7144',
           '10000': '0xF60dD140cFf0706bAE9Cd734Ac3ae76AD9eBC32A',
@@ -31,7 +33,7 @@ module.exports = {
         decimals: 18
       },
       cdai: {
-        mixerAddress: {
+        instanceAddress: {
           '5000': '0x22aaA7720ddd5388A3c0A3333430953C68f1849b',
           '50000': '0xBA214C1c1928a32Bffe790263E38B4Af9bFCD659',
           '500000': '0xb1C8094B234DcE6e03f10a5b673c1d8C69739A00',
@@ -42,7 +44,7 @@ module.exports = {
         decimals: 8
       },
       usdc: {
-        mixerAddress: {
+        instanceAddress: {
           '100': '0xd96f2B1c14Db8458374d9Aca76E26c3D18364307',
           '1000': '0x4736dCf1b7A3d580672CcE6E7c65cd5cc9cFBa9D',
           '10000': '0xD691F27f38B395864Ea86CfC7253969B409c362d',
@@ -53,7 +55,7 @@ module.exports = {
         decimals: 6
       },
       cusdc: {
-        mixerAddress: {
+        instanceAddress: {
           '5000': '0xaEaaC358560e11f52454D997AAFF2c5731B6f8a6',
           '50000': '0x1356c899D8C9467C7f71C195612F8A395aBf2f0a',
           '500000': '0xA60C772958a3eD56c1F15dD055bA37AC8e523a0D',
@@ -64,7 +66,7 @@ module.exports = {
         decimals: 8
       },
       usdt: {
-        mixerAddress: {
+        instanceAddress: {
           '100': '0x169AD27A470D064DEDE56a2D3ff727986b15D52B',
           '1000': '0x0836222F2B2B24A3F36f98668Ed8F0B38D1a872f',
           '10000': '0xF67721A2D8F736E75a49FdD7FAd2e31D8676542a',
@@ -77,7 +79,7 @@ module.exports = {
     },
     netId42: {
       eth: {
-        mixerAddress: {
+        instanceAddress: {
           '0.1': '0x8b3f5393bA08c24cc7ff5A66a832562aAB7bC95f',
           '1': '0xD6a6AC46d02253c938B96D12BE439F570227aE8E',
           '10': '0xe1BE96331391E519471100c3c1528B66B8F4e5a7',
@@ -87,7 +89,7 @@ module.exports = {
         decimals: 18
       },
       dai: {
-        mixerAddress: {
+        instanceAddress: {
           '100': '0xdf2d3cC5F361CF95b3f62c4bB66deFe3FDE47e3D',
           '1000': '0xD96291dFa35d180a71964D0894a1Ae54247C4ccD',
           '10000': '0xb192794f72EA45e33C3DF6fe212B9c18f6F45AE3',
@@ -98,7 +100,7 @@ module.exports = {
         decimals: 18
       },
       cdai: {
-        mixerAddress: {
+        instanceAddress: {
           '5000': '0x6Fc9386ABAf83147b3a89C36D422c625F44121C8',
           '50000': '0x7182EA067e0f050997444FCb065985Fd677C16b6',
           '500000': '0xC22ceFd90fbd1FdEeE554AE6Cc671179BC3b10Ae',
@@ -109,7 +111,7 @@ module.exports = {
         decimals: 8
       },
       usdc: {
-        mixerAddress: {
+        instanceAddress: {
           '100': '0x137E2B6d185018e7f09f6cf175a970e7fC73826C',
           '1000': '0xcC7f1633A5068E86E3830e692e3e3f8f520525Af',
           '10000': '0x28C8f149a0ab8A9bdB006B8F984fFFCCE52ef5EF',
@@ -120,7 +122,7 @@ module.exports = {
         decimals: 6
       },
       cusdc: {
-        mixerAddress: {
+        instanceAddress: {
           '5000': '0xc0648F28ABA385c8a1421Bbf1B59e3c474F89cB0',
           '50000': '0x0C53853379c6b1A7B74E0A324AcbDD5Eabd4981D',
           '500000': '0xf84016A0E03917cBe700D318EB1b7a53e6e3dEe1',
@@ -131,7 +133,7 @@ module.exports = {
         decimals: 8
       },
       usdt: {
-        mixerAddress: {
+        instanceAddress: {
           '100': '0x327853Da7916a6A0935563FB1919A48843036b42',
           '1000': '0x531AA4DF5858EA1d0031Dad16e3274609DE5AcC0',
           '10000': '0x0958275F0362cf6f07D21373aEE0cf37dFe415dD',
@@ -144,7 +146,7 @@ module.exports = {
     }
   },
   defaultGasPrice: 20,
-  port: process.env.APP_PORT,
+  port: process.env.APP_PORT || 8000,
   relayerServiceFee: Number(process.env.RELAYER_FEE),
   maxGasPrice: process.env.MAX_GAS_PRICE || 200,
   watherInterval: Number(process.env.NONCE_WATCHER_INTERVAL || 30) * 1000,

keys/.gitignore

@@ -0,0 +1,2 @@
+# avoid committing non-prduction blobs
+./*

package.json

@@ -2,9 +2,9 @@
   "name": "relay",
   "version": "3.0.2",
   "description": "Relayer for Tornado.cash privacy solution. https://tornado.cash",
-  "main": "app.js",
   "scripts": {
-    "start": "node app.js",
+    "server": "node src/server.js",
+    "treeUpdater": "node src/treeWatcher",
     "eslint": "npx eslint --ignore-path .gitignore .",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
@@ -12,12 +12,16 @@
   "license": "MIT",
   "dependencies": {
     "bull": "^3.12.1",
+    "circomlib": "git+https://github.com/tornadocash/circomlib.git#5beb6aee94923052faeecea40135d45b6ce6172c",
     "dotenv": "^8.2.0",
     "express": "^4.17.1",
+    "fixed-merkle-tree": "^0.4.0",
     "gas-price-oracle": "^0.1.5",
     "ioredis": "^4.14.1",
     "node-fetch": "^2.6.0",
-    "web3": "^1.2.2",
+    "tornado-cash-anonymity-mining": "git+https://github.com/tornadocash/tornado-anonymity-mining.git#820bd83254f3264cebaf255869641ebc33288dc3",
+    "uuid": "^8.3.0",
+    "web3": "^1.3.0",
     "web3-utils": "^1.2.2"
   },
   "devDependencies": {

src.bak/relayController.js

@@ -4,6 +4,8 @@ const mixerABI = require('../abis/mixerABI.json')
 const { isValidProof, isValidArgs, isKnownContract, isEnoughFee } = require('./utils')
 const config = require('../config')
 const { redisClient, redisOpts } = require('./redis')
+const { GasPriceOracle } = require('gas-price-oracle')
+const gasPriceOracle = new GasPriceOracle({ defaultRpc: rpcUrl })
 
 const { web3, fetcher, sender, gasPriceOracle } = require('./instances')
 const withdrawQueue = new Queue('withdraw', redisOpts)

src.bak/treeUpdate.js

@@ -0,0 +1,19 @@
+const fs = require('fs')
+const { Controller } = require('tornado-cash-anonymity-mining')
+const { web3 } = require('./instances')
+const { farmingAddress, farmingMerkleTreeHeight } = require('../config')
+
+const contract = web3.eth.contract(require('../abis/mining.abi.json'), farmingAddress)
+const provingKeys = {
+  treeUpdateCircuit: require('.../keys/TreeUpdate.json'),
+  treeUpdateProvingKey: fs.readFileSync('../keys/TreeUpdate_proving_key.bin').buffer,
+}
+const controller = new Controller({
+  contract,
+  provingKeys,
+  merkleTreeHeight: farmingMerkleTreeHeight,
+})
+
+
+// await controller.init()
+// await controller.treeUpdate(commitment)

src.bak/utils.js

@@ -0,0 +1,178 @@
+const { isHexStrict, toBN, toWei, BN } = require('web3-utils')
+const { netId, mixers, relayerServiceFee } = require('../config')
+
+function isValidProof(proof) {
+  // validator expects `websnarkUtils.toSolidityInput(proof)` output
+
+  if (!proof) {
+    return { valid: false, reason: 'The proof is empty.' }
+  }
+
+  if (!isHexStrict(proof) || proof.length !== 2 + 2 * 8 * 32) {
+    return { valid: false, reason: 'Corrupted proof' }
+  }
+
+  return { valid: true }
+}
+
+function isValidArgs(args) {
+  if (!args) {
+    return { valid: false, reason: 'Args are empty' }
+  }
+
+  if (args.length !== 6) {
+    return { valid: false, reason: 'Length of args is lower than 6' }
+  }
+
+  for (let signal of args) {
+    if (!isHexStrict(signal)) {
+      return { valid: false, reason: `Corrupted signal ${signal}` }
+    }
+  }
+
+  if (
+    args[0].length !== 66 ||
+    args[1].length !== 66 ||
+    args[2].length !== 42 ||
+    args[3].length !== 42 ||
+    args[4].length !== 66 ||
+    args[5].length !== 66
+  ) {
+    return { valid: false, reason: 'The length one of the signals is incorrect' }
+  }
+
+  return { valid: true }
+}
+
+function isKnownContract(contract) {
+  const mixers = getMixers()
+  for (let currency of Object.keys(mixers)) {
+    for (let amount of Object.keys(mixers[currency].mixerAddress)) {
+      if (mixers[currency].mixerAddress[amount] === contract) {
+        return { valid: true, currency, amount }
+      }
+    }
+  }
+  return { valid: false }
+}
+
+function sleep(ms) {
+  return new Promise((resolve) => setTimeout(resolve, ms))
+}
+
+function fromDecimals(value, decimals) {
+  value = value.toString()
+  let ether = value.toString()
+  const base = new BN('10').pow(new BN(decimals))
+  const baseLength = base.toString(10).length - 1 || 1
+
+  const negative = ether.substring(0, 1) === '-'
+  if (negative) {
+    ether = ether.substring(1)
+  }
+
+  if (ether === '.') {
+    throw new Error('[ethjs-unit] while converting number ' + value + ' to wei, invalid value')
+  }
+
+  // Split it into a whole and fractional part
+  const comps = ether.split('.')
+  if (comps.length > 2) {
+    throw new Error('[ethjs-unit] while converting number ' + value + ' to wei,  too many decimal points')
+  }
+
+  let whole = comps[0]
+  let fraction = comps[1]
+
+  if (!whole) {
+    whole = '0'
+  }
+  if (!fraction) {
+    fraction = '0'
+  }
+  if (fraction.length > baseLength) {
+    throw new Error('[ethjs-unit] while converting number ' + value + ' to wei, too many decimal places')
+  }
+
+  while (fraction.length < baseLength) {
+    fraction += '0'
+  }
+
+  whole = new BN(whole)
+  fraction = new BN(fraction)
+  let wei = whole.mul(base).add(fraction)
+
+  if (negative) {
+    wei = wei.mul(negative)
+  }
+
+  return new BN(wei.toString(10), 10)
+}
+
+function isEnoughFee({ gas, gasPrices, currency, amount, refund, ethPrices, fee }) {
+  const { decimals } = mixers[`netId${netId}`][currency]
+  const decimalsPoint =
+    Math.floor(relayerServiceFee) === relayerServiceFee
+      ? 0
+      : relayerServiceFee.toString().split('.')[1].length
+
+  const roundDecimal = 10 ** decimalsPoint
+  const feePercent = toBN(fromDecimals(amount, decimals))
+    .mul(toBN(relayerServiceFee * roundDecimal))
+    .div(toBN(roundDecimal * 100))
+  const expense = toBN(toWei(gasPrices.fast.toString(), 'gwei')).mul(toBN(gas))
+  let desiredFee
+  switch (currency) {
+    case 'eth': {
+      desiredFee = expense.add(feePercent)
+      break
+    }
+    default: {
+      desiredFee = expense
+        .add(refund)
+        .mul(toBN(10 ** decimals))
+        .div(toBN(ethPrices[currency]))
+      desiredFee = desiredFee.add(feePercent)
+      break
+    }
+  }
+  console.log(
+    'sent fee, desired fee, feePercent',
+    fee.toString(),
+    desiredFee.toString(),
+    feePercent.toString()
+  )
+  if (fee.lt(desiredFee)) {
+    return { isEnough: false, reason: 'Not enough fee' }
+  }
+  return { isEnough: true }
+}
+
+function getArgsForOracle() {
+  const tokens = mixers['netId1']
+  const tokenAddresses = []
+  const oneUintAmount = []
+  const currencyLookup = {}
+  Object.entries(tokens).map(([currency, data]) => {
+    if (currency !== 'eth') {
+      tokenAddresses.push(data.tokenAddress)
+      oneUintAmount.push(toBN('10').pow(toBN(data.decimals.toString())).toString())
+      currencyLookup[data.tokenAddress] = currency
+    }
+  })
+  return { tokenAddresses, oneUintAmount, currencyLookup }
+}
+
+function getMixers() {
+  return mixers[`netId${netId}`]
+}
+
+module.exports = {
+  isValidProof,
+  isValidArgs,
+  sleep,
+  isKnownContract,
+  isEnoughFee,
+  getMixers,
+  getArgsForOracle
+}

src/controller.js

@@ -0,0 +1,21 @@
+const { getWithdrawInputError } = require('./validate')
+const { postJob } = require('./queue')
+
+async function tornadoWithdraw(req, res) {
+  const inputError = getWithdrawInputError(req.body)
+  if (inputError) {
+    console.log('Invalid input:', inputError)
+    return res.status(400).json({ error: inputError })
+  }
+
+  const { proof, args, contract } = req.body
+  const id = await postJob({
+    type: 'withdraw',
+    data: { proof, args, contract },
+  })
+  return res.json({ id })
+}
+
+module.exports = {
+  tornadoWithdraw,
+}

src/queue.js

@@ -0,0 +1,40 @@
+const { v4: uuid } = require('uuid')
+const Queue = require('bull')
+const Redis = require('ioredis')
+const { redisUrl } = require('../config')
+const redis = new Redis(redisUrl)
+
+const queue = new Queue('proofs', redisUrl)
+
+async function postJob(type, data) {
+  const id = uuid()
+
+  const job = await queue.add(
+    'proofs',
+    {
+      id,
+      type,
+      data,
+    },
+    // { removeOnComplete: true },
+  )
+  await redis.set(`job:${id}`, job.id)
+  return id
+}
+
+async function getJob(uuid) {
+  const id = await redis.get(`job:${uuid}`)
+  return queue.getJobFromId(id)
+}
+
+async function getJobStatus(uuid) {
+  const job = await getJob(uuid)
+  // ...
+}
+
+module.exports = {
+  postJob,
+  getJob,
+  getJobStatus,
+  queue,
+}

src/server.js

@@ -0,0 +1,34 @@
+const express = require('express')
+const status = require('status')
+const controller = require('controller')
+const { port } = require('../config')
+const { version } = require('../package.json')
+
+const app = express()
+app.use(express.json())
+
+// Log error to console but don't send it to the client to avoid leaking data
+app.use((err, req, res, next) => {
+  if (err) {
+    console.error(err)
+    return res.sendStatus(500)
+  }
+  next()
+})
+
+// Add CORS headers
+app.use((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('/', status.index)
+app.get('/v1/status', status.status)
+app.post('/v1/jobs/:id', status.getJob)
+app.post('/v1/tornadoWithdraw', controller.tornadoWithdraw)
+app.post('/v1/miningReward', controller.miningReward)
+app.post('/v1/miningWithdraw', controller.miningWithdraw)
+
+console.log('Version:', version)
+app.listen(port)

src/status.js

@@ -0,0 +1,38 @@
+const queue = require('queue')
+
+async function status(req, res) {
+  let nonce = await redisClient.get('nonce')
+  let latestBlock = null
+  try {
+    latestBlock = await web3.eth.getBlockNumber()
+  } catch (e) {
+    console.error('Problem with RPC', e)
+  }
+  const { ethPrices } = fetcher
+  res.json({
+    relayerAddress: web3.eth.defaultAccount,
+    mixers,
+    gasPrices: await gasPriceOracle.gasPrices(),
+    netId,
+    ethPrices,
+    relayerServiceFee,
+    nonce,
+    version,
+    latestBlock
+  })
+}
+
+function index(req, res) {
+  res.send('This is <a href=https://tornado.cash>tornado.cash</a> Relayer service. Check the <a href=/v1/status>/status</a> for settings')
+}
+
+async function getJob(req, res) {
+  const status = await queue.getJobStatus(req.params.id)
+  return res.send(status)
+}
+
+module.exports = {
+  status,
+  index,
+  getJob,
+}

src/treeWatcher.js

@@ -0,0 +1,95 @@
+const MerkleTree = require('fixed-merkle-tree')
+const { redisUrl, rpcUrl, minerMerkleTreeHeight, minerAddress } = require('../config')
+const { poseidonHash2 } = require('./utils')
+const { toBN } = require('web3-utils')
+const Redis = require('ioredis')
+const redis = new Redis(redisUrl)
+const Web3 = require('web3')
+const web3 = new Web3(rpcUrl)
+const contract = new web3.eth.Contract(require('../abis/mining.abi.json'), minerAddress)
+
+let tree, eventSubscription, blockSubscription
+
+async function fetchEvents(from = 0, to = 'latest') {
+  const events = await contract.getPastEvents('NewAccount', {
+    fromBlock: from,
+    toBlock: to,
+  })
+  return events
+    .sort((a, b) => a.returnValues.index - b.returnValues.index)
+    .map((e) => toBN(e.returnValues.commitment))
+}
+
+async function processNewEvent(err, event) {
+  if (err) {
+    throw new Error(`Event handler error: ${err}`)
+    // console.error(err)
+    // return
+  }
+
+  console.log('New account event', event.returnValues)
+  const { commitment, index } = event.returnValues
+  if (tree.elements().length === Number(index)) {
+    tree.insert(toBN(commitment))
+    await updateRedis()
+  } else if (tree.elements().length === Number(index) + 1) {
+    console.log('Replacing element', index)
+    tree.update(index, toBN(commitment))
+    await updateRedis()
+  } else {
+    console.log(`Invalid element index ${index}, rebuilding tree`)
+    await rebuild()
+  }
+}
+
+async function processNewBlock(err) {
+  if (err) {
+    throw new Error(`Event handler error: ${err}`)
+    // console.error(err)
+    // return
+  }
+  await updateRedis()
+}
+
+async function updateRedis() {
+  const rootOnContract = await contract.methods.getLastAccountRoot().call()
+  if (!tree.root().eq(toBN(rootOnContract))) {
+    console.log(`Invalid tree root: ${tree.root()} != ${toBN(rootOnContract)}, rebuilding tree`)
+    await rebuild()
+    return
+  }
+  const rootInRedis = await redis.get('tree:root')
+  if (!rootInRedis || !tree.root().eq(toBN(rootInRedis))) {
+    const serializedTree = JSON.stringify(tree.serialize())
+    await redis.set('tree:elements', serializedTree)
+    await redis.set('tree:root', tree.root().toString())
+    await redis.publish('treeUpdate', tree.root().toString())
+    console.log('Updated tree in redis, new root:', tree.root().toString())
+  } else {
+    console.log('Tree in redis is up to date, skipping update')
+  }
+}
+
+async function rebuild() {
+  await eventSubscription.unsubscribe()
+  await blockSubscription.unsubscribe()
+  setTimeout(init, 3000)
+}
+
+async function init() {
+  console.log('Initializing')
+  const block = await web3.eth.getBlockNumber()
+  const events = await fetchEvents(0, block)
+  tree = new MerkleTree(minerMerkleTreeHeight, events, { hashFunction: poseidonHash2 })
+  console.log(`Rebuilt tree with ${events.length} elements, root: ${tree.root()}`)
+  eventSubscription = contract.events.NewAccount({ fromBlock: block + 1 }, processNewEvent)
+  blockSubscription = web3.eth.subscribe('newBlockHeaders', processNewBlock)
+  await updateRedis()
+}
+
+init()
+
+process.on('unhandledRejection', error => {
+  console.error('Unhandled promise rejection', error)
+  process.exit(1)
+})

src/utils.js

@@ -1,178 +1,40 @@
-const { isHexStrict, toBN, toWei, BN } = require('web3-utils')
-const { netId, mixers, relayerServiceFee } = require('../config')
+const { instances, netId } = require('../config')
+const { poseidon } = require('circomlib')
+const { toBN } = require('web3-utils')
 
-function isValidProof(proof) {
-  // validator expects `websnarkUtils.toSolidityInput(proof)` output
-
-  if (!proof) {
-    return { valid: false, reason: 'The proof is empty.' }
+function getInstance(address) {
+  const inst = instances[`netId${netId}`]
+  for (const currency of Object.keys(inst)) {
+    for (const amount of Object.keys(inst[currency].instanceAddress)) {
+      if (inst[currency].instanceAddress[amount] === address) {
+        return { currency, amount }
+      }
+    }
+  }
+  return null
 }
 
-  if (!isHexStrict(proof) || proof.length !== 2 + 2 * 8 * 32) {
-    return { valid: false, reason: 'Corrupted proof' }
-  }
+// async function setSafeInterval(func, interval) {
+//   try {
+//     await func()
+//   } catch (e) {
+//     console.error('Unhandled promise error:', e)
+//   } finally {
+//     setTimeout(() => setSafeInterval(func, interval), interval)
+//   }
+// }
 
-  return { valid: true }
-}
+const poseidonHash = (items) => toBN(poseidon(items).toString())
+const poseidonHash2 = (a, b) => poseidonHash([a, b])
 
-function isValidArgs(args) {
-  if (!args) {
-    return { valid: false, reason: 'Args are empty' }
-  }
-
-  if (args.length !== 6) {
-    return { valid: false, reason: 'Length of args is lower than 6' }
-  }
-
-  for (let signal of args) {
-    if (!isHexStrict(signal)) {
-      return { valid: false, reason: `Corrupted signal ${signal}` }
-    }
-  }
-
-  if (
-    args[0].length !== 66 ||
-    args[1].length !== 66 ||
-    args[2].length !== 42 ||
-    args[3].length !== 42 ||
-    args[4].length !== 66 ||
-    args[5].length !== 66
-  ) {
-    return { valid: false, reason: 'The length one of the signals is incorrect' }
-  }
-
-  return { valid: true }
-}
-
-function isKnownContract(contract) {
-  const mixers = getMixers()
-  for (let currency of Object.keys(mixers)) {
-    for (let amount of Object.keys(mixers[currency].mixerAddress)) {
-      if (mixers[currency].mixerAddress[amount] === contract) {
-        return { valid: true, currency, amount }
-      }
-    }
-  }
-  return { valid: false }
-}
-
-function sleep(ms) {
-  return new Promise((resolve) => setTimeout(resolve, ms))
-}
-
-function fromDecimals(value, decimals) {
-  value = value.toString()
-  let ether = value.toString()
-  const base = new BN('10').pow(new BN(decimals))
-  const baseLength = base.toString(10).length - 1 || 1
-
-  const negative = ether.substring(0, 1) === '-'
-  if (negative) {
-    ether = ether.substring(1)
-  }
-
-  if (ether === '.') {
-    throw new Error('[ethjs-unit] while converting number ' + value + ' to wei, invalid value')
-  }
-
-  // Split it into a whole and fractional part
-  const comps = ether.split('.')
-  if (comps.length > 2) {
-    throw new Error('[ethjs-unit] while converting number ' + value + ' to wei,  too many decimal points')
-  }
-
-  let whole = comps[0]
-  let fraction = comps[1]
-
-  if (!whole) {
-    whole = '0'
-  }
-  if (!fraction) {
-    fraction = '0'
-  }
-  if (fraction.length > baseLength) {
-    throw new Error('[ethjs-unit] while converting number ' + value + ' to wei, too many decimal places')
-  }
-
-  while (fraction.length < baseLength) {
-    fraction += '0'
-  }
-
-  whole = new BN(whole)
-  fraction = new BN(fraction)
-  let wei = whole.mul(base).add(fraction)
-
-  if (negative) {
-    wei = wei.mul(negative)
-  }
-
-  return new BN(wei.toString(10), 10)
-}
-
-function isEnoughFee({ gas, gasPrices, currency, amount, refund, ethPrices, fee }) {
-  const { decimals } = mixers[`netId${netId}`][currency]
-  const decimalsPoint =
-    Math.floor(relayerServiceFee) === relayerServiceFee
-      ? 0
-      : relayerServiceFee.toString().split('.')[1].length
-
-  const roundDecimal = 10 ** decimalsPoint
-  const feePercent = toBN(fromDecimals(amount, decimals))
-    .mul(toBN(relayerServiceFee * roundDecimal))
-    .div(toBN(roundDecimal * 100))
-  const expense = toBN(toWei(gasPrices.fast.toString(), 'gwei')).mul(toBN(gas))
-  let desiredFee
-  switch (currency) {
-    case 'eth': {
-      desiredFee = expense.add(feePercent)
-      break
-    }
-    default: {
-      desiredFee = expense
-        .add(refund)
-        .mul(toBN(10 ** decimals))
-        .div(toBN(ethPrices[currency]))
-      desiredFee = desiredFee.add(feePercent)
-      break
-    }
-  }
-  console.log(
-    'sent fee, desired fee, feePercent',
-    fee.toString(),
-    desiredFee.toString(),
-    feePercent.toString()
-  )
-  if (fee.lt(desiredFee)) {
-    return { isEnough: false, reason: 'Not enough fee' }
-  }
-  return { isEnough: true }
-}
-
-function getArgsForOracle() {
-  const tokens = mixers['netId1']
-  const tokenAddresses = []
-  const oneUintAmount = []
-  const currencyLookup = {}
-  Object.entries(tokens).map(([currency, data]) => {
-    if (currency !== 'eth') {
-      tokenAddresses.push(data.tokenAddress)
-      oneUintAmount.push(toBN('10').pow(toBN(data.decimals.toString())).toString())
-      currencyLookup[data.tokenAddress] = currency
-    }
+function setSafeInterval(func, interval) {
+  func().catch(console.error).finally(() => {
+    setTimeout(() => setSafeInterval(func, interval), interval)
   })
-  return { tokenAddresses, oneUintAmount, currencyLookup }
-}
-
-function getMixers() {
-  return mixers[`netId${netId}`]
 }
 
 module.exports = {
-  isValidProof,
-  isValidArgs,
-  sleep,
-  isKnownContract,
-  isEnoughFee,
-  getMixers,
-  getArgsForOracle
+  getInstance,
+  setSafeInterval,
+  poseidonHash2,
 }

src/validate.js

@@ -0,0 +1,83 @@
+const { isHexStrict } = require('web3-utils')
+const { getInstance } = require('./utils')
+const { rewardAccount } = require('../config')
+
+function getProofError(proof) {
+  if (!proof) {
+    return 'The proof is empty'
+  }
+
+  if (!isHexStrict(proof) || proof.length !== 2 + 2 * 8 * 32) {
+    return 'Corrupted proof'
+  }
+
+  return null
+}
+
+function getArgsError(args, expectedLengths) {
+  if (!args) {
+    return 'Args are empty'
+  }
+
+  if (!Array.isArray(args)) {
+    return 'Args should be an array'
+  }
+
+  if (args.length !== expectedLengths.length) {
+    return `Expected ${expectedLengths.length} args`
+  }
+
+  for (let i = 0; i < args.length; i++) {
+    if (!isHexStrict(args[i])) {
+      return `Corrupted signal ${i}: ${args[i]}`
+    }
+    if (args[i].length !== 2 + expectedLengths * 20) {
+      return `Signal ${i} has invalid length: ${args[i]}`
+    }
+  }
+
+  return null
+}
+
+function getContractError(contract) {
+  if (!contract) {
+    return 'The contract is empty'
+  }
+
+  if (!isHexStrict(contract) || contract.length !== 42) {
+    return 'Corrupted contract'
+  }
+
+  if (!getInstance(contract)) {
+    return `This relayer does not support the token: ${contract}`
+  }
+
+  return null
+}
+
+function getRewardAddressError(address) {
+  if (address.toLowerCase() !== rewardAccount.toLowerCase()) {
+    return 'This proof is for different relayer'
+  }
+
+  return null
+}
+
+function getWithdrawInputError(input) {
+  return getProofError(input.proof) || getArgsError(input.args, [32, 32, 20, 20, 32, 32]) || getContractError(input.contract) || getRewardAddressError(input.args[3])
+}
+
+function getClaimInputError(input) {
+  return getProofError(input.proof) || getArgsError(input.args, [32, 32, 20, 20, 32, 32])
+}
+
+function getRewardInputError(input) {
+  return getProofError(input.proof) || getArgsError(input.args, [32, 32, 20, 20, 32, 32])
+}
+
+
+module.exports = {
+  getWithdrawInputError,
+  getClaimInputError,
+  getRewardInputError,
+}

src/worker.js

@@ -0,0 +1,102 @@
+const { queue } = require('./queue')
+const Web3 = require('web3')
+const { rpcUrl, redisUrl, privateKey, netId, gasBumpInterval, gasBumpPercentage, maxGasPrice } = require('../config')
+const { numberToHex, toWei, toHex, toBN, fromWei, toChecksumAddress, BN } = require('web3-utils')
+const tornadoABI = require('../abis/tornadoABI.json')
+const MerkleTree = require('fixed-merkle-tree')
+const { setSafeInterval, poseidonHash2 } = require('./utils')
+const Redis = require('ioredis')
+const redis = new Redis(redisUrl)
+const redisSubscribe = new Redis(redisUrl)
+const { GasPriceOracle } = require('gas-price-oracle')
+const gasPriceOracle = new GasPriceOracle({ defaultRpc: rpcUrl })
+queue.process(process)
+redisSubscribe.subscribe('treeUpdate', fetchTree)
+
+let web3
+let nonce
+let currentTx
+let tree
+
+async function fetchTree() {
+  const elements = await redis.get('tree:elements')
+  const convert = (_, val) => typeof(val) === 'string' ? toBN(val) : val
+  tree = MerkleTree.deserialize(JSON.parse(elements, convert), poseidonHash2)
+
+  if (currentTx) {
+    // todo replace
+  }
+}
+
+async function watcher() {
+  if (currentTx && Date.now() - currentTx.date > gasBumpInterval) {
+    const newGasPrice = toBN(currentTx.gasPrice).mul(toBN(gasBumpPercentage)).div(toBN(100))
+    const maxGasPrice = toBN(toWei(maxGasPrice.toString(), 'Gwei'))
+    currentTx.gasPrice = toHex(BN.min(newGasPrice, maxGasPrice))
+    currentTx.date = Date.now()
+    console.log(`Resubmitting with gas price ${fromWei(currentTx.gasPrice.toString(), 'gwei')} gwei`)
+    //await this.sendTx(tx, null, 9999)
+  }
+}
+
+async function init() {
+  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
+  nonce = await web3.eth.getTransactionCount(account.address, 'latest')
+  await fetchTree()
+  setSafeInterval(watcher, 1000)
+}
+
+
+async function checkTornadoFee(contract, fee, refund) {
+
+}
+
+async function process(job) {
+  if (job.type !== 'tornadoWithdraw') {
+    throw new Error('not implemented')
+  }
+  console.log(Date.now(), ' withdraw started', job.id)
+  const { proof, args, contract } = job.data
+  const fee = toBN(args[4])
+  const refund = toBN(args[5])
+  await checkTornadoFee(contract, fee, refund)
+
+
+  const instance = new web3.eth.Contract(tornadoABI, contract)
+  const data = instance.methods.withdraw(proof, ...args).encodeABI()
+  const gasPrices = await gasPriceOracle.gasPrices()
+  const tx = {
+    from: web3.eth.defaultAccount,
+    value: numberToHex(refund),
+    gasPrice: toHex(toWei(gasPrices.fast.toString(), 'gwei')),
+    to: contract,
+    netId,
+    data,
+    nonce,
+  }
+  // nonce++ later
+
+  const gas = await web3.eth.estimateGas(tx)
+  tx.gas = gas
+  let signedTx = await this.web3.eth.accounts.signTransaction(tx, privateKey)
+  let result = this.web3.eth.sendSignedTransaction(signedTx.rawTransaction)
+
+  result.once('transactionHash', async (txHash) => {
+    console.log(`A new successfully sent tx ${txHash}`)
+    job.data.txHash = txHash
+    await job.update(job.data)
+  })
+
+  await result
+}
+
+async function main() {
+  await init()
+
+}
+
+// main()
+fetchTree()