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support relay in CLI, refactor

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poma 2019-11-10 03:48:09 +03:00
parent 1a17e7eea3
commit d01018db9f
3 changed files with 310 additions and 172 deletions
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438
cli.js
View File

@ -2,6 +2,7 @@
// Temporary demo client
// Works both in browser and node.js
const fs = require('fs')
const axios = require('axios')
const assert = require('assert')
const snarkjs = require('snarkjs')
const crypto = require('crypto')
@ -11,16 +12,31 @@ const merkleTree = require('./lib/MerkleTree')
const Web3 = require('web3')
const buildGroth16 = require('websnark/src/groth16')
const websnarkUtils = require('websnark/src/utils')
const { toWei, fromWei } = require('web3-utils')
let web3, mixer, erc20mixer, circuit, proving_key, groth16, erc20
let MERKLE_TREE_HEIGHT, ETH_AMOUNT, ERC20_TOKEN
let web3, mixer, erc20mixer, circuit, proving_key, groth16, erc20, senderAccount
let MERKLE_TREE_HEIGHT, ETH_AMOUNT, TOKEN_AMOUNT, ERC20_TOKEN
/** Whether we are in a browser or node.js */
const inBrowser = (typeof window !== 'undefined')
/** Generate random number of specified byte length */
const rbigint = (nbytes) => snarkjs.bigInt.leBuff2int(crypto.randomBytes(nbytes))
const rbigint = nbytes => snarkjs.bigInt.leBuff2int(crypto.randomBytes(nbytes))
/** Compute pedersen hash */
const pedersenHash = (data) => circomlib.babyJub.unpackPoint(circomlib.pedersenHash.hash(data))[0]
const pedersenHash = data => circomlib.babyJub.unpackPoint(circomlib.pedersenHash.hash(data))[0]
/** BigNumber to hex string of specified length */
function toHex(number, length = 32) {
let str = number instanceof Buffer ? number.toString('hex') : bigInt(number).toString(16)
return '0x' + str.padStart(length * 2, '0')
}
/** Display account balance */
async function printBalance(account, name) {
console.log(`${name} ETH balance is`, web3.utils.fromWei(await web3.eth.getBalance(account)))
console.log(`${name} Token Balance is`, web3.utils.fromWei(await erc20.methods.balanceOf(account).call()))
}
/**
* Create deposit object from secret and nullifier
@ -29,169 +45,103 @@ function createDeposit(nullifier, secret) {
let deposit = { nullifier, secret }
deposit.preimage = Buffer.concat([deposit.nullifier.leInt2Buff(31), deposit.secret.leInt2Buff(31)])
deposit.commitment = pedersenHash(deposit.preimage)
deposit.nullifierHash = pedersenHash(deposit.nullifier.leInt2Buff(31))
return deposit
}
/**
* Make a deposit
* @returns {Promise<string>}
* Make an ETH deposit
*/
async function deposit() {
const deposit = createDeposit(rbigint(31), rbigint(31))
console.log('Submitting deposit transaction')
await mixer.methods.deposit('0x' + deposit.commitment.toString(16)).send({ value: ETH_AMOUNT, from: (await web3.eth.getAccounts())[0], gas:1e6 })
await mixer.methods.deposit(toHex(deposit.commitment)).send({ value: ETH_AMOUNT, from: senderAccount, gas:1e6 })
const note = '0x' + deposit.preimage.toString('hex')
const note = toHex(deposit.preimage, 62)
console.log('Your note:', note)
return note
}
/**
* Make an ERC20 deposit
*/
async function depositErc20() {
const account = (await web3.eth.getAccounts())[0]
const tokenAmount = process.env.TOKEN_AMOUNT
await erc20.methods.mint(account, tokenAmount).send({ from: account, gas:1e6 })
await erc20.methods.approve(erc20mixer.address, tokenAmount).send({ from: account, gas:1e6 })
const allowance = await erc20.methods.allowance(account, erc20mixer.address).call()
console.log('erc20mixer allowance', allowance.toString(10))
const deposit = createDeposit(rbigint(31), rbigint(31))
await erc20mixer.methods.deposit('0x' + deposit.commitment.toString(16)).send({ value: ETH_AMOUNT, from: account, gas:1e6 })
const balance = await erc20.methods.balanceOf(erc20mixer.address).call()
console.log('erc20mixer balance', balance.toString(10))
const note = '0x' + deposit.preimage.toString('hex')
if(ERC20_TOKEN === '') {
console.log('Minting some test tokens to deposit')
await erc20.methods.mint(senderAccount, TOKEN_AMOUNT).send({ from: senderAccount, gas: 1e6 })
}
console.log('Approving tokens for deposit')
await erc20.methods.approve(erc20mixer._address, TOKEN_AMOUNT).send({ from: senderAccount, gas:1e6 })
console.log('Submitting deposit transaction')
await erc20mixer.methods.deposit(toHex(deposit.commitment)).send({ from: senderAccount, gas:1e6 })
const note = toHex(deposit.preimage, 62)
console.log('Your note:', note)
return note
}
async function withdrawErc20(note, recipient, relayer) {
let buf = Buffer.from(note.slice(2), 'hex')
let deposit = createDeposit(bigInt.leBuff2int(buf.slice(0, 31)), bigInt.leBuff2int(buf.slice(31, 62)))
console.log('Getting current state from mixer contract')
const events = await erc20mixer.getPastEvents('Deposit', { fromBlock: erc20mixer.deployedBlock, toBlock: 'latest' })
let leafIndex
const commitment = deposit.commitment.toString(16).padStart('66', '0x000000')
const leaves = events
.sort((a, b) => a.returnValues.leafIndex.sub(b.returnValues.leafIndex))
.map(e => {
if (e.returnValues.commitment.eq(commitment)) {
leafIndex = e.returnValues.leafIndex.toNumber()
}
return e.returnValues.commitment
})
const tree = new merkleTree(MERKLE_TREE_HEIGHT, leaves)
const validRoot = await erc20mixer.methods.isKnownRoot(await tree.root()).call()
const nullifierHash = pedersenHash(deposit.nullifier.leInt2Buff(31))
const nullifierHashToCheck = nullifierHash.toString(16).padStart('66', '0x000000')
const isSpent = await erc20mixer.methods.isSpent(nullifierHashToCheck).call()
assert(validRoot === true)
assert(isSpent === false)
assert(leafIndex >= 0)
const { root, path_elements, path_index } = await tree.path(leafIndex)
// Circuit input
const input = {
// public
root: root,
nullifierHash,
recipient: bigInt(recipient),
relayer: bigInt(relayer),
fee: bigInt(web3.utils.toWei('0.01')),
refund: bigInt(0),
// private
nullifier: deposit.nullifier,
secret: deposit.secret,
pathElements: path_elements,
pathIndices: path_index,
}
console.log('Generating SNARK proof')
console.time('Proof time')
const proofData = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
const { proof } = websnarkUtils.toSolidityInput(proofData)
console.timeEnd('Proof time')
console.log('Submitting withdraw transaction')
const args = [
toHex(input.root),
toHex(input.nullifierHash),
toHex(input.recipient, 20),
toHex(input.relayer, 20),
toHex(input.fee),
toHex(input.refund)
]
await erc20mixer.methods.withdraw(proof, ...args).send({ from: (await web3.eth.getAccounts())[0], gas: 1e6 })
console.log('Done')
}
async function getBalance(recipient) {
const balance = await web3.eth.getBalance(recipient)
console.log('Balance is ', web3.utils.fromWei(balance))
}
async function getBalanceErc20(recipient, relayer) {
const balanceRecipient = await web3.eth.getBalance(recipient)
const balanceRelayer = await web3.eth.getBalance(relayer)
const tokenBalanceRecipient = await erc20.methods.balanceOf(recipient).call()
const tokenBalanceRelayer = await erc20.methods.balanceOf(relayer).call()
console.log('Recipient eth Balance is ', web3.utils.fromWei(balanceRecipient))
console.log('Relayer eth Balance is ', web3.utils.fromWei(balanceRelayer))
console.log('Recipient token Balance is ', web3.utils.fromWei(tokenBalanceRecipient.toString()))
console.log('Relayer token Balance is ', web3.utils.fromWei(tokenBalanceRelayer.toString()))
}
function toHex(number, length = 32) {
let str = bigInt(number).toString(16)
while (str.length < length * 2) str = '0' + str
str = '0x' + str
return str
}
async function withdraw(note, recipient) {
// Decode hex string and restore the deposit object
let buf = Buffer.from(note.slice(2), 'hex')
let deposit = createDeposit(bigInt.leBuff2int(buf.slice(0, 31)), bigInt.leBuff2int(buf.slice(31, 62)))
const nullifierHash = pedersenHash(deposit.nullifier.leInt2Buff(31))
const paddedNullifierHash = nullifierHash.toString(16).padStart('66', '0x000000')
const paddedCommitment = deposit.commitment.toString(16).padStart('66', '0x000000')
/**
* Generate merkle tree for a deposit.
* Download deposit events from the contract, reconstructs merkle tree, finds our deposit leaf
* in it and generates merkle proof
* @param contract Mixer contract address
* @param deposit Deposit object
*/
async function generateMerkleProof(contract, deposit) {
// Get all deposit events from smart contract and assemble merkle tree from them
console.log('Getting current state from mixer contract')
const events = await mixer.getPastEvents('Deposit', { fromBlock: mixer.deployedBlock, toBlock: 'latest' })
const events = await contract.getPastEvents('Deposit', { fromBlock: contract.deployedBlock, toBlock: 'latest' })
const leaves = events
.sort((a, b) => a.returnValues.leafIndex - b.returnValues.leafIndex) // Sort events in chronological order
.map(e => e.returnValues.commitment)
const tree = new merkleTree(MERKLE_TREE_HEIGHT, leaves)
// Find current commitment in the tree
let depositEvent = events.find(e => e.returnValues.commitment === paddedCommitment)
let depositEvent = events.find(e => e.returnValues.commitment === toHex(deposit.commitment))
let leafIndex = depositEvent ? depositEvent.returnValues.leafIndex : -1
// Validate that our data is correct
const isValidRoot = await mixer.methods.isKnownRoot(toHex(await tree.root())).call()
const isSpent = await mixer.methods.isSpent(paddedNullifierHash).call()
assert(isValidRoot === true) // Merkle tree assembled correctly
assert(isSpent === false) // The note is not spent
assert(leafIndex >= 0) // Our deposit is present in the tree
const isValidRoot = await contract.methods.isKnownRoot(toHex(await tree.root())).call()
const isSpent = await contract.methods.isSpent(toHex(deposit.nullifierHash)).call()
assert(isValidRoot === true, 'Merkle tree is corrupted')
assert(isSpent === false, 'The note is already spent')
assert(leafIndex >= 0, 'The deposit is not found in the tree')
// Compute merkle proof of our commitment
const { root, path_elements, path_index } = await tree.path(leafIndex)
return await tree.path(leafIndex)
}
/**
* Generate SNARK proof for withdrawal
* @param contract Mixer contract address
* @param note Note string
* @param recipient Funds recipient
* @param relayer Relayer address
* @param fee Relayer fee
* @param refund Receive ether for exchanged tokens
*/
async function generateProof(contract, note, recipient, relayer = 0, fee = 0, refund = 0) {
// Decode hex string and restore the deposit object
let buf = Buffer.from(note.slice(2), 'hex')
let deposit = createDeposit(bigInt.leBuff2int(buf.slice(0, 31)), bigInt.leBuff2int(buf.slice(31, 62)))
// Compute merkle proof of our commitment
const { root, path_elements, path_index } = await generateMerkleProof(contract, deposit)
// Prepare circuit input
const input = {
// Public snark inputs
root: root,
nullifierHash,
nullifierHash: deposit.nullifierHash,
recipient: bigInt(recipient),
relayer: bigInt(0),
fee: bigInt(0),
refund: bigInt(0),
relayer: bigInt(relayer),
fee: bigInt(fee),
refund: bigInt(refund),
// Private snark inputs
nullifier: deposit.nullifier,
@ -206,7 +156,6 @@ async function withdraw(note, recipient) {
const { proof } = websnarkUtils.toSolidityInput(proofData)
console.timeEnd('Proof time')
console.log('Submitting withdraw transaction')
const args = [
toHex(input.root),
toHex(input.nullifierHash),
@ -215,10 +164,109 @@ async function withdraw(note, recipient) {
toHex(input.fee),
toHex(input.refund)
]
await mixer.methods.withdraw(proof, ...args).send({ from: (await web3.eth.getAccounts())[0], gas: 1e6 })
return { proof, args }
}
/**
* Do an ETH withdrawal
* @param note Note to withdraw
* @param recipient Recipient address
*/
async function withdraw(note, recipient) {
const { proof, args } = await generateProof(mixer, note, recipient)
console.log('Submitting withdraw transaction')
await mixer.methods.withdraw(proof, ...args).send({ from: senderAccount, gas: 1e6 })
console.log('Done')
}
/**
* Do a ERC20 withdrawal
* @param note Note to withdraw
* @param recipient Recipient address
*/
async function withdrawErc20(note, recipient) {
const { proof, args } = await generateProof(erc20mixer, note, recipient)
console.log('Submitting withdraw transaction')
await erc20mixer.methods.withdraw(proof, ...args).send({ from: senderAccount, gas: 1e6 })
console.log('Done')
}
/**
* Do an ETH withdrawal through relay
* @param note Note to withdraw
* @param recipient Recipient address
* @param relayUrl Relay url address
*/
async function withdrawRelay(note, recipient, relayUrl) {
const resp = await axios.get(relayUrl + '/status')
const { relayerAddress, netId, gasPrices } = resp.data
assert(netId === await web3.eth.net.getId() || netId === '*', 'This relay is for different network')
console.log('Relay address: ', relayerAddress)
const fee = bigInt(toWei(gasPrices.fast.toString(), 'gwei')).mul(bigInt(1e6))
const { proof, args } = await generateProof(mixer, note, recipient, relayerAddress, fee)
console.log('Sending withdraw transaction through relay')
const resp2 = await axios.post(relayUrl + '/relay', { contract: mixer._address, proof: { proof, publicSignals: args } })
console.log(`Transaction submitted through relay, tx hash: ${resp2.data.txHash}`)
let receipt = await waitForTxReceipt(resp2.data.txHash)
console.log('Transaction mined in block', receipt.blockNumber)
console.log('Done')
}
/**
* Do a ERC20 withdrawal through relay
* @param note Note to withdraw
* @param recipient Recipient address
* @param relayUrl Relay url address
*/
async function withdrawRelayErc20(note, recipient, relayUrl) {
const resp = await axios.get(relayUrl + '/status')
const { relayerAddress, netId, gasPrices, ethPriceInDai } = resp.data
assert(netId === await web3.eth.net.getId() || netId === '*', 'This relay is for different network')
console.log('Relay address: ', relayerAddress)
const refund = bigInt(toWei('0.001'))
const fee = bigInt(toWei(gasPrices.fast.toString(), 'gwei')).mul(bigInt(1e6)).add(refund).mul(bigInt(fromWei(ethPriceInDai.toString())))
const { proof, args } = await generateProof(erc20mixer, note, recipient, relayerAddress, fee, refund)
console.log('Sending withdraw transaction through relay')
const resp2 = await axios.post(relayUrl + '/relay', { contract: erc20mixer._address, proof: { proof, publicSignals: args } })
console.log(`Transaction submitted through relay, tx hash: ${resp2.data.txHash}`)
let receipt = await waitForTxReceipt(resp2.data.txHash)
console.log('Transaction mined in block', receipt.blockNumber)
console.log('Done')
}
/**
* Waits for transaction to be mined
* @param txHash Hash of transaction
* @param attempts
* @param delay
*/
function waitForTxReceipt(txHash, attempts = 60, delay = 1000) {
return new Promise((resolve, reject) => {
const checkForTx = async (txHash, retryAttempt = 0) => {
const result = await web3.eth.getTransactionReceipt(txHash)
if (!result || !result.blockNumber) {
if (retryAttempt <= attempts) {
setTimeout(() => checkForTx(txHash, retryAttempt + 1), delay)
} else {
reject(new Error('tx was not mined'))
}
} else {
resolve(result)
}
}
checkForTx(txHash)
})
}
/**
* Init web3, contracts, and snark
*/
@ -233,6 +281,7 @@ async function init() {
proving_key = await (await fetch('build/circuits/withdraw_proving_key.bin')).arrayBuffer()
MERKLE_TREE_HEIGHT = 16
ETH_AMOUNT = 1e18
TOKEN_AMOUNT = 1e19
} else {
// Initialize from local node
web3 = new Web3('http://localhost:8545', null, { transactionConfirmationBlocks: 1 })
@ -242,6 +291,7 @@ async function init() {
require('dotenv').config()
MERKLE_TREE_HEIGHT = process.env.MERKLE_TREE_HEIGHT
ETH_AMOUNT = process.env.ETH_AMOUNT
TOKEN_AMOUNT = process.env.TOKEN_AMOUNT
ERC20_TOKEN = process.env.ERC20_TOKEN
erc20ContractJson = require('./build/contracts/ERC20Mock.json')
erc20mixerJson = require('./build/contracts/ERC20Mixer.json')
@ -263,22 +313,31 @@ async function init() {
const tx2 = await web3.eth.getTransaction(erc20ContractJson.networks[netId].transactionHash)
erc20.deployedBlock = tx2.blockNumber
}
senderAccount = (await web3.eth.getAccounts())[0]
console.log('Loaded')
}
// ========== CLI related stuff below ==============
/** Print command line help */
function printHelp(code = 0) {
console.log(`Usage:
Submit a deposit from default eth account and return the resulting note
$ ./cli.js deposit
$ ./cli.js depositErc20
Withdraw a note to 'recipient' account
$ ./cli.js withdraw <note> <recipient>
$ ./cli.js withdraw <note> <recipient> [relayUrl]
$ ./cli.js withdrawErc20 <note> <recipient> [relayUrl]
Check address balance
$ ./cli.js balance <address>
Perform an automated test
$ ./cli.js test
$ ./cli.js testRelay
Example:
$ ./cli.js deposit
...
@ -289,75 +348,99 @@ Example:
process.exit(code)
}
if (inBrowser) {
window.deposit = deposit
window.withdraw = async () => {
const note = prompt('Enter the note to withdraw')
const recipient = (await web3.eth.getAccounts())[0]
await withdraw(note, recipient)
}
init()
} else {
const args = process.argv.slice(2)
/** Process command line args and run */
async function runConsole(args) {
if (args.length === 0) {
printHelp()
} else {
switch (args[0]) {
case 'deposit':
if (args.length === 1) {
init().then(() => deposit()).then(() => process.exit(0)).catch(err => {console.log(err); process.exit(1)})
}
else
await init()
await printBalance(mixer._address, 'Mixer')
await printBalance(senderAccount, 'Sender account')
await deposit()
await printBalance(mixer._address, 'Mixer')
await printBalance(senderAccount, 'Sender account')
} else {
printHelp(1)
}
break
case 'depositErc20':
if (args.length === 1) {
init().then(() => depositErc20()).then(() => process.exit(0)).catch(err => {console.log(err); process.exit(1)})
}
else
await init()
await printBalance(erc20mixer._address, 'Mixer')
await printBalance(senderAccount, 'Sender account')
await depositErc20()
await printBalance(erc20mixer._address, 'Mixer')
await printBalance(senderAccount, 'Sender account')
} else {
printHelp(1)
}
break
case 'balance':
if (args.length === 2 && /^0x[0-9a-fA-F]{40}$/.test(args[1])) {
init().then(() => getBalance(args[1])).then(() => process.exit(0)).catch(err => {console.log(err); process.exit(1)})
} else
printHelp(1)
break
case 'balanceErc20':
if (args.length === 3 && /^0x[0-9a-fA-F]{40}$/.test(args[1]) && /^0x[0-9a-fA-F]{40}$/.test(args[2])) {
init().then(() => getBalanceErc20(args[1], args[2])).then(() => process.exit(0)).catch(err => {console.log(err); process.exit(1)})
} else
await init()
await printBalance(args[1])
} else {
printHelp(1)
}
break
case 'withdraw':
if (args.length === 3 && /^0x[0-9a-fA-F]{124}$/.test(args[1]) && /^0x[0-9a-fA-F]{40}$/.test(args[2])) {
init().then(() => withdraw(args[1], args[2])).then(() => process.exit(0)).catch(err => {console.log(err); process.exit(1)})
if (args.length >= 3 && args.length <= 4 && /^0x[0-9a-fA-F]{124}$/.test(args[1]) && /^0x[0-9a-fA-F]{40}$/.test(args[2])) {
await init()
await printBalance(mixer._address, 'Mixer')
await printBalance(args[2], 'Recipient account')
if (args[3]) {
await withdrawRelay(args[1], args[2], args[3])
} else {
await withdraw(args[1], args[2])
}
else
await printBalance(mixer._address, 'Mixer')
await printBalance(args[2], 'Recipient account')
} else {
printHelp(1)
}
break
case 'withdrawErc20':
if (args.length === 4 && /^0x[0-9a-fA-F]{124}$/.test(args[1]) && /^0x[0-9a-fA-F]{40}$/.test(args[2]) && /^0x[0-9a-fA-F]{40}$/.test(args[3])) {
init().then(() => withdrawErc20(args[1], args[2], args[3])).then(() => process.exit(0)).catch(err => {console.log(err); process.exit(1)})
if (args.length >= 3 && args.length <= 4 && /^0x[0-9a-fA-F]{124}$/.test(args[1]) && /^0x[0-9a-fA-F]{40}$/.test(args[2])) {
await init()
await printBalance(erc20mixer._address, 'Mixer')
await printBalance(args[2], 'Recipient account')
if (args[3]) {
await withdrawRelayErc20(args[1], args[2], args[3])
} else {
await withdrawErc20(args[1], args[2])
}
else
await printBalance(erc20mixer._address, 'Mixer')
await printBalance(args[2], 'Recipient account')
} else {
printHelp(1)
}
break
case 'test':
if (args.length === 1) {
(async () => {
await init()
const account = (await web3.eth.getAccounts())[0]
const note = await deposit()
await withdraw(note, account)
const note1 = await deposit()
await withdraw(note1, senderAccount)
const note2 = await deposit()
await withdraw(note2, account, account)
process.exit(0)
})()
}
else
const note2 = await depositErc20()
await withdrawErc20(note2, senderAccount)
} else {
printHelp(1)
}
break
case 'testRelay':
if (args.length === 1) {
await init()
const note1 = await deposit()
await withdrawRelay(note1, senderAccount, 'http://localhost:8000')
const note2 = await depositErc20()
await withdrawRelayErc20(note2, senderAccount, 'http://localhost:8000')
} else {
printHelp(1)
}
break
default:
@ -365,3 +448,18 @@ if (inBrowser) {
}
}
}
if (inBrowser) {
window.deposit = deposit
window.depositErc20 = depositErc20
window.withdraw = async () => {
const note = prompt('Enter the note to withdraw')
const recipient = (await web3.eth.getAccounts())[0]
await withdraw(note, recipient)
}
init()
} else {
runConsole(process.argv.slice(2))
.then(() => process.exit(0))
.catch(err => { console.log(err); process.exit(1) })
}

39
package-lock.json generated
View File

@ -488,6 +488,22 @@
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},
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1
package.json
View File

@ -30,6 +30,7 @@
"@truffle/artifactor": "^4.0.38",
"@truffle/contract": "^4.0.39",
"@truffle/hdwallet-provider": "^1.0.24",
"axios": "^0.19.0",
"bn-chai": "^1.0.1",
"browserify": "^16.5.0",
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