uniswap integration
This commit is contained in:
Alexey
parent
5b53815aa2
commit
1dea821af3
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@ -11,12 +11,15 @@
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pragma solidity ^0.5.8;
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import "./Mixer.sol";
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import "./GSNMixer.sol";
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import "./IUniswapExchange.sol";
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import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
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contract ERC20Mixer is Mixer {
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contract ERC20Mixer is GSNMixer {
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address public token;
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// ether value to cover network fee (for relayer) and to have some ETH on a brand new address
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uint256 public userEther;
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IUniswapExchange public uniswap;
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constructor(
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address _verifier,
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@ -25,10 +28,13 @@ contract ERC20Mixer is Mixer {
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uint256 _emptyElement,
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address payable _operator,
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address _token,
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uint256 _mixDenomination
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) Mixer(_verifier, _mixDenomination, _merkleTreeHeight, _emptyElement, _operator) public {
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uint256 _mixDenomination,
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IUniswapExchange _uniswap
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) GSNMixer(_verifier, _mixDenomination, _merkleTreeHeight, _emptyElement, _operator) public {
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token = _token;
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userEther = _userEther;
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uniswap = _uniswap;
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ERC20(token).approve(address(uniswap), 2**256 - 1);
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}
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function _processDeposit() internal {
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@ -45,6 +51,32 @@ contract ERC20Mixer is Mixer {
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}
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}
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// this func is called by RelayerHub right after calling a target func
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function postRelayedCall(bytes memory context, bool /*success*/, uint actualCharge, bytes32 /*preRetVal*/) public onlyHub {
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// this require allows to protect againt malicious relay hub that can drain the mixer
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require(couldBeWithdrawn, "could be called only after withdrawViaRelayer");
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couldBeWithdrawn = false;
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IRelayHub relayHub = IRelayHub(getHubAddr());
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address payable recipient;
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uint256 nullifierHash;
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assembly {
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recipient := mload(add(context, 32))
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nullifierHash := mload(add(context, 64))
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}
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uint256 tokensToSell = uniswap.getTokenToEthOutputPrice(actualCharge);
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// require(tokensToSell <= mixDenomination, "price is too high");
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// tokensToSell = tokensToSell.add(tokensToSell.div(50)); // add 2% slippage
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uint256 actualSold = uniswap.tokenToEthSwapOutput(actualCharge, tokensToSell, now);
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//require(actualSold == tokensToSell, "uniswap lies about its prices");
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safeErc20Transfer(recipient, mixDenomination - actualSold);
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relayHub.depositFor.value(actualCharge)(address(this));
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emit Withdraw(recipient, nullifierHash, tx.origin, actualCharge);
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}
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function safeErc20TransferFrom(address from, address to, uint256 amount) internal {
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bool success;
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bytes memory data;
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@ -62,7 +94,7 @@ contract ERC20Mixer is Mixer {
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assembly {
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success := mload(add(data, 0x20))
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}
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require(success, "not enough allowed tokens");
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require(success, "not enough allowed tokens. Token returns false.");
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}
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}
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@ -83,7 +115,7 @@ contract ERC20Mixer is Mixer {
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assembly {
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success := mload(add(data, 0x20))
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}
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require(success, "not enough tokens");
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require(success, "not enough tokens. Token returns false.");
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}
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}
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}
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@ -0,0 +1,70 @@
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pragma solidity ^0.5.0;
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contract IUniswapExchange {
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// Address of ERC20 token sold on this excha
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function tokenAddress() external view returns (address token) {}
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// Address of Uniswap Factory
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function factoryAddress() external view returns (address factory) {}
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// Provide Liquidity
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function addLiquidity(uint256 min_liquidity, uint256 max_tokens, uint256 deadline) external payable returns (uint256) {}
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function removeLiquidity(uint256 amount, uint256 min_eth, uint256 min_tokens, uint256 deadline) external returns (uint256, uint256) {}
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// Get Prices
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function getEthToTokenInputPrice(uint256 eth_sold) external view returns (uint256 tokens_bought) {}
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function getEthToTokenOutputPrice(uint256 tokens_bought) external view returns (uint256 eth_sold) {}
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function getTokenToEthInputPrice(uint256 tokens_sold) external view returns (uint256 eth_bought) {}
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function getTokenToEthOutputPrice(uint256 eth_bought) external view returns (uint256 tokens_sold) {}
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// Trade ETH to ERC20
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function ethToTokenSwapInput(uint256 min_tokens, uint256 deadline) external payable returns (uint256 tokens_bought) {}
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function ethToTokenTransferInput(uint256 min_tokens, uint256 deadline, address recipient) external payable returns (uint256 tokens_bought) {}
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function ethToTokenSwapOutput(uint256 tokens_bought, uint256 deadline) external payable returns (uint256 eth_sold) {}
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function ethToTokenTransferOutput(uint256 tokens_bought, uint256 deadline, address recipient) external payable returns (uint256 eth_sold) {}
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// Trade ERC20 to ETH
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function tokenToEthSwapInput(uint256 tokens_sold, uint256 min_eth, uint256 deadline) external returns (uint256 eth_bought) {}
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function tokenToEthTransferInput(uint256 tokens_sold, uint256 min_eth, uint256 deadline, address recipient) external returns (uint256 eth_bought) {}
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function tokenToEthSwapOutput(uint256 eth_bought, uint256 max_tokens, uint256 deadline) external returns (uint256 tokens_sold) {}
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function tokenToEthTransferOutput(uint256 eth_bought, uint256 max_tokens, uint256 deadline, address recipient) external returns (uint256 tokens_sold) {}
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// Trade ERC20 to ERC20
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function tokenToTokenSwapInput(uint256 tokens_sold, uint256 min_tokens_bought, uint256 min_eth_bought, uint256 deadline, address token_addr) external returns (uint256 tokens_bought) {}
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function tokenToTokenTransferInput(uint256 tokens_sold, uint256 min_tokens_bought, uint256 min_eth_bought, uint256 deadline, address recipient, address token_addr) external returns (uint256 tokens_bought) {}
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function tokenToTokenSwapOutput(uint256 tokens_bought, uint256 max_tokens_sold, uint256 max_eth_sold, uint256 deadline, address token_addr) external returns (uint256 tokens_sold) {}
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function tokenToTokenTransferOutput(uint256 tokens_bought, uint256 max_tokens_sold, uint256 max_eth_sold, uint256 deadline, address recipient, address token_addr) external returns (uint256 tokens_sold) {}
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// Trade ERC20 to Custom Pool
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function tokenToExchangeSwapInput(uint256 tokens_sold, uint256 min_tokens_bought, uint256 min_eth_bought, uint256 deadline, address exchange_addr) external returns (uint256 tokens_bought) {}
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function tokenToExchangeTransferInput(uint256 tokens_sold, uint256 min_tokens_bought, uint256 min_eth_bought, uint256 deadline, address recipient, address exchange_addr) external returns (uint256 tokens_bought) {}
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function tokenToExchangeSwapOutput(uint256 tokens_bought, uint256 max_tokens_sold, uint256 max_eth_sold, uint256 deadline, address exchange_addr) external returns (uint256 tokens_sold) {}
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function tokenToExchangeTransferOutput(uint256 tokens_bought, uint256 max_tokens_sold, uint256 max_eth_sold, uint256 deadline, address recipient, address exchange_addr) external returns (uint256 tokens_sold) {}
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// ERC20 comaptibility for liquidity tokens
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bytes32 public name;
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bytes32 public symbol;
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uint256 public decimals;
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function transfer(address _to, uint256 _value) external returns (bool) {}
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function transferFrom(address _from, address _to, uint256 value) external returns (bool) {}
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function approve(address _spender, uint256 _value) external returns (bool) {}
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function allowance(address _owner, address _spender) external view returns (uint256) {}
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function balanceOf(address _owner) external view returns (uint256) {}
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function totalSupply() external view returns (uint256) {}
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// Never use
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function setup(address token_addr) external {}
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}
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@ -0,0 +1,67 @@
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pragma solidity ^0.5.0;
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import "./ERC20Mock.sol";
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import "../IUniswapExchange.sol";
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contract UniswapMock is IUniswapExchange {
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ERC20Mock public token;
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uint256 public price;
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// EthPurchase: event({buyer: indexed(address), tokens_sold: indexed(uint256), eth_bought: indexed(uint256(wei))})
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event EthPurchase(address buyer, uint256 tokens_sold, uint256 eth_bought);
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constructor(ERC20Mock _token, uint256 _price) public payable {
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token = _token;
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price = _price; // in wei
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}
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/*
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* @notice Convert Tokens to ETH.
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* @dev User specifies maximum input and exact output.
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* @param eth_bought Amount of ETH purchased.
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* @param max_tokens Maximum Tokens sold.
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* @param deadline Time after which this transaction can no longer be executed.
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* @return Amount of Tokens sold.
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* @public
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* def tokenToEthSwapOutput(eth_bought: uint256(wei), max_tokens: uint256, deadline: timestamp) -> uint256:
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*/
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function tokenToEthSwapOutput(uint256 eth_bought, uint256 /*max_tokens*/, uint256 /*deadline*/) public returns(uint256 tokens_sold) {
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tokens_sold = getTokenToEthOutputPrice(eth_bought);
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token.transferFrom(msg.sender, address(this), tokens_sold);
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msg.sender.transfer(eth_bought);
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emit EthPurchase(msg.sender, tokens_sold, eth_bought);
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return eth_bought;
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}
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function getTokenToEthOutputPrice(uint256 eth_bought) public view returns (uint256) {
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return eth_bought * price / 10**18;
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}
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// /*
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// * @notice Convert Tokens to ETH.
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// * @dev User specifies exact input and minimum output.
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// * @param tokens_sold Amount of Tokens sold.
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// * @param min_eth Minimum ETH purchased.
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// * @param deadline Time after which this transaction can no longer be executed.
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// * @return Amount of ETH bought.
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// * def tokenToEthSwapInput(tokens_sold: uint256, min_eth: uint256(wei), deadline: timestamp) -> uint256(wei):
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// */
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// function tokenToEthSwapInput(uint256 tokens_sold, uint256 min_eth, uint256 deadline) public returns(uint256) {
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// token.transferFrom(msg.sender, address(this), tokens_sold);
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// uint256 eth_bought = getTokenToEthInputPrice(tokens_sold);
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// msg.sender.transfer(eth_bought);
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// return eth_bought;
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// }
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// function getTokenToEthInputPrice(uint256 tokens_sold /* in wei */) public view returns (uint256 eth_bought) {
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// return tokens_sold * price / 10**18;
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// }
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function setPrice(uint256 _price) external {
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price = _price;
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}
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function() external payable {}
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}
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@ -4,6 +4,9 @@ const ERC20Mixer = artifacts.require('ERC20Mixer')
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const Verifier = artifacts.require('Verifier')
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const MiMC = artifacts.require('MiMC')
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const ERC20Mock = artifacts.require('ERC20Mock')
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const UniswapMock = artifacts.require('UniswapMock')
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const { toBN, toWei } = require('web3-utils')
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const eth2daiPrice = toBN('174552286079977583324') // cause 1 ETH == 174.55 DAI
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module.exports = function(deployer, network, accounts) {
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@ -12,10 +15,15 @@ module.exports = function(deployer, network, accounts) {
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const verifier = await Verifier.deployed()
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const miMC = await MiMC.deployed()
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await ERC20Mixer.link(MiMC, miMC.address)
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let token = ERC20_TOKEN
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if(token === '') {
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const tokenInstance = await deployer.deploy(ERC20Mock)
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token = tokenInstance.address
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let tokenAddress = ERC20_TOKEN
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let uniswapAddress
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if (network === 'development') {
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if(tokenAddress === '') { // means we want to test with mock
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const tokenInstance = await deployer.deploy(ERC20Mock)
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tokenAddress = tokenInstance.address
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}
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const uniswap = await deployer.deploy(UniswapMock, tokenAddress, eth2daiPrice, { value: toWei('0.5') })
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uniswapAddress = uniswap.address
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}
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const mixer = await deployer.deploy(
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ERC20Mixer,
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@ -24,8 +32,9 @@ module.exports = function(deployer, network, accounts) {
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MERKLE_TREE_HEIGHT,
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EMPTY_ELEMENT,
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accounts[0],
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token,
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TOKEN_AMOUNT
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tokenAddress,
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TOKEN_AMOUNT,
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uniswapAddress
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)
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console.log('ERC20Mixer\'s address ', mixer.address)
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})
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@ -6,15 +6,18 @@ require('chai')
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const fs = require('fs')
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const Web3 = require('web3')
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const { toBN, toHex, toChecksumAddress, toWei } = require('web3-utils')
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const { toBN, toHex, toChecksumAddress, toWei, fromWei } = require('web3-utils')
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const { takeSnapshot, revertSnapshot } = require('../lib/ganacheHelper')
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const { deployRelayHub, fundRecipient } = require('@openzeppelin/gsn-helpers')
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const { GSNDevProvider, GSNProvider, utils } = require('@openzeppelin/gsn-provider')
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const { ephemeral } = require('@openzeppelin/network')
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const Mixer = artifacts.require('./ETHMixer.sol')
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const ERC20Mixer = artifacts.require('./ERC20Mixer.sol')
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const RelayHub = artifacts.require('./IRelayHub.sol')
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const { ETH_AMOUNT, MERKLE_TREE_HEIGHT, EMPTY_ELEMENT } = process.env
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const Token = artifacts.require('./ERC20Mock.sol')
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const Uniswap = artifacts.require('./UniswapMock.sol')
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const { ETH_AMOUNT, MERKLE_TREE_HEIGHT, EMPTY_ELEMENT, ERC20_TOKEN, TOKEN_AMOUNT } = process.env
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const websnarkUtils = require('websnark/src/utils')
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const buildGroth16 = require('websnark/src/groth16')
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@ -48,16 +51,21 @@ function getRandomReceiver() {
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contract('GSN support', accounts => {
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let mixer
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let ercMixer
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let gsnMixer
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let hubInstance
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let relayHubAddress
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let token
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let uniswap
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const sender = accounts[0]
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const operator = accounts[0]
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const user = accounts[3]
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const relayerOwnerAddress = accounts[8]
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const relayerAddress = accounts[9]// '0x714992E1acbc7f888Be2A1784F0D23e73f4A1ead'
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const levels = MERKLE_TREE_HEIGHT || 16
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const zeroValue = EMPTY_ELEMENT || 1337
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const value = ETH_AMOUNT || '1000000000000000000' // 1 ether
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let tokenDenomination = TOKEN_AMOUNT || '1000000000000000000' // 1 ether
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let snapshotId
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let prefix = 'test'
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let tree
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@ -73,6 +81,10 @@ contract('GSN support', accounts => {
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const postRelayedCallMaxGas = 100000
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const recipientCallsAtomicOverhead = 5000
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let postRelayMaxGas = toBN(postRelayedCallMaxGas + recipientCallsAtomicOverhead)
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// this price is for tokenToEthSwapInput stategy
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// const eth2daiPriceInput = toBN(toWei('1')).mul(toBN(10e18)).div(toBN('174552286079977583324')) // cause 1 ETH == 174.55 DAI
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// this price is for tokenToEthSwapOutput stategy
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const eth2daiPrice = toBN('174552286079977583324') // cause 1 ETH == 174.55 DAI
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before(async () => {
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tree = new MerkleTree(
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@ -82,12 +94,15 @@ contract('GSN support', accounts => {
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prefix,
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)
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mixer = await Mixer.deployed()
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ercMixer = await ERC20Mixer.deployed()
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relayHubAddress = toChecksumAddress(await deployRelayHub(web3, {
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from: sender
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}))
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await fundRecipient(web3, { recipient: mixer.address, relayHubAddress })
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await fundRecipient(web3, { recipient: ercMixer.address, relayHubAddress })
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const currentHub = await mixer.getHubAddr()
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await ercMixer.upgradeRelayHub(relayHubAddress)
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if (relayHubAddress !== currentHub) {
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await mixer.upgradeRelayHub(relayHubAddress)
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}
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@ -95,6 +110,15 @@ contract('GSN support', accounts => {
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await hubInstance.stake(relayerAddress, unstakeDelay , { from: relayerOwnerAddress, value: toWei('1') })
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await hubInstance.registerRelay(relayerTxFee, 'http://gsn-dev-relayer.openzeppelin.com/', { from: relayerAddress })
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if (ERC20_TOKEN) {
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token = await Token.at(ERC20_TOKEN)
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// uniswap = await Uniswap.at()
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} else {
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token = await Token.deployed()
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await token.mint(user, tokenDenomination)
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uniswap = await Uniswap.deployed()
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}
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snapshotId = await takeSnapshot()
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groth16 = await buildGroth16()
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circuit = require('../build/circuits/withdraw.json')
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@ -280,6 +304,106 @@ contract('GSN support', accounts => {
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})
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console.log('tx succeed', tx.status)
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})
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it('uniswap mock test', async () => {
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const valueToBuy = toBN(toWei('0.04'))
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await token.approve(uniswap.address, tokenDenomination, { from: user, gasPrice: 0 })
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const tokens = await uniswap.getTokenToEthOutputPrice(valueToBuy)
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const balanceBefore = await web3.eth.getBalance(user)
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const tokenBalanceBefore = await token.balanceOf(user)
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await uniswap.tokenToEthSwapOutput(valueToBuy, 1, 2, { from: user, gasPrice: 0 })
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const balanceAfter = await web3.eth.getBalance(user)
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const tokenBalanceAfter = await token.balanceOf(user)
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balanceBefore.should.be.eq.BN(toBN(balanceAfter).sub(valueToBuy))
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tokenBalanceBefore.should.be.eq.BN(toBN(tokenBalanceAfter).add(toBN(tokens)))
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valueToBuy.mul(eth2daiPrice).div(toBN(toWei('1'))).should.be.eq.BN(tokens)
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})
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it.only('should work for token', async () => {
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const gasPrice = toBN('1')
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const deposit = generateDeposit()
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const user = accounts[4]
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await tree.insert(deposit.commitment)
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await token.mint(user, tokenDenomination)
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await token.approve(ercMixer.address, tokenDenomination, { from: user })
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await ercMixer.deposit(toBN(deposit.commitment.toString()), { value, from: user, gasPrice })
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const { root, path_elements, path_index } = await tree.path(0)
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// Circuit input
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const input = stringifyBigInts({
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// public
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root,
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nullifierHash: pedersenHash(deposit.nullifier.leInt2Buff(31)),
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receiver,
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relayer: operator, // this value wont be taken into account
|
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fee: bigInt(1), // this value wont be taken into account
|
||||
|
||||
// private
|
||||
nullifier: deposit.nullifier,
|
||||
secret: deposit.secret,
|
||||
pathElements: path_elements,
|
||||
pathIndex: path_index,
|
||||
})
|
||||
|
||||
|
||||
const proof = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
|
||||
const { pi_a, pi_b, pi_c, publicSignals } = websnarkUtils.toSolidityInput(proof)
|
||||
|
||||
const balanceMixerBefore = await web3.eth.getBalance(ercMixer.address)
|
||||
const balanceHubBefore = await web3.eth.getBalance(relayHubAddress)
|
||||
const balanceRelayerBefore = await web3.eth.getBalance(relayerAddress)
|
||||
const balanceRelayerOwnerBefore = await web3.eth.getBalance(relayerOwnerAddress)
|
||||
const balanceRecieverBefore = await web3.eth.getBalance(toHex(receiver.toString()))
|
||||
|
||||
gsnProvider = new GSNDevProvider('http://localhost:8545', {
|
||||
signKey,
|
||||
relayerOwner: relayerOwnerAddress,
|
||||
relayerAddress,
|
||||
verbose: true,
|
||||
txFee: relayerTxFee
|
||||
})
|
||||
gsnWeb3 = new Web3(gsnProvider, null, { transactionConfirmationBlocks: 1 })
|
||||
gsnMixer = new gsnWeb3.eth.Contract(ercMixer.abi, ercMixer.address)
|
||||
|
||||
const tx = await gsnMixer.methods.withdrawViaRelayer(pi_a, pi_b, pi_c, publicSignals).send({
|
||||
from: signKey.address,
|
||||
gas: 3e6,
|
||||
gasPrice,
|
||||
value: 0
|
||||
})
|
||||
console.log('tx', tx)
|
||||
const { gasUsed } = tx
|
||||
const balanceMixerAfter = await web3.eth.getBalance(ercMixer.address)
|
||||
const balanceHubAfter = await web3.eth.getBalance(relayHubAddress)
|
||||
const balanceRelayerAfter = await web3.eth.getBalance(relayerAddress)
|
||||
const balanceRelayerOwnerAfter = await web3.eth.getBalance(relayerOwnerAddress)
|
||||
const balanceRecieverAfter = await web3.eth.getBalance(toHex(receiver.toString()))
|
||||
// console.log('balanceMixerBefore, balanceMixerAfter', balanceMixerBefore.toString(), balanceMixerAfter.toString())
|
||||
// console.log('balanceRecieverBefore, balanceRecieverAfter', balanceRecieverBefore.toString(), balanceRecieverAfter.toString())
|
||||
// console.log('balanceHubBefore, balanceHubAfter', balanceHubBefore.toString(), balanceHubAfter.toString())
|
||||
// console.log('balanceRelayerBefore, balanceRelayerAfter', balanceRelayerBefore.toString(), balanceRelayerAfter.toString(), toBN(balanceRelayerBefore).sub(toBN(balanceRelayerAfter)).toString())
|
||||
// console.log('balanceRelayerOwnerBefore, balanceRelayerOwnerAfter', balanceRelayerOwnerBefore.toString(), balanceRelayerOwnerAfter.toString())
|
||||
balanceMixerAfter.should.be.eq.BN(toBN(balanceMixerBefore).sub(toBN(value)))
|
||||
const networkFee = toBN(gasUsed).mul(gasPrice)
|
||||
const chargedFee = networkFee.add(networkFee.div(toBN(relayerTxFee)))
|
||||
// console.log('networkFee :', networkFee.toString())
|
||||
// console.log('calculated chargedFee :', chargedFee.toString())
|
||||
const actualFee = toBN(value).sub(toBN(balanceRecieverAfter))
|
||||
// console.log('actual fee :', actualFee.toString())
|
||||
// const postRelayMaxCost = postRelayMaxGas.mul(gasPrice)
|
||||
// const actualFeeWithoutPostCall = actualFee.sub(postRelayMaxCost)
|
||||
// console.log('actualFeeWithoutPostCall :', actualFeeWithoutPostCall.toString())
|
||||
networkFee.should.be.lt.BN(chargedFee)
|
||||
chargedFee.should.be.lt.BN(actualFee)
|
||||
|
||||
balanceRelayerAfter.should.be.eq.BN(toBN(balanceRelayerBefore).sub(networkFee))
|
||||
balanceRelayerOwnerAfter.should.be.eq.BN(toBN(balanceRelayerOwnerBefore))
|
||||
balanceRecieverAfter.should.be.gt.BN(toBN(balanceRecieverBefore))
|
||||
balanceRecieverAfter.should.be.lt.BN(toBN(value).sub(chargedFee))
|
||||
balanceHubAfter.should.be.eq.BN(toBN(balanceHubBefore).add(actualFee))
|
||||
})
|
||||
})
|
||||
|
||||
afterEach(async () => {
|
||||
|
|
|
|||
Loading…
Reference in New Issue