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uniswap integration

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Alexey 2019-10-03 21:42:48 +03:00
parent 5b53815aa2
commit 1dea821af3
5 changed files with 316 additions and 14 deletions
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contracts/Mocks/UniswapMock.sol Normal file
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pragma solidity ^0.5.0;
import "./ERC20Mock.sol";
import "../IUniswapExchange.sol";
contract UniswapMock is IUniswapExchange {
ERC20Mock public token;
uint256 public price;
// EthPurchase: event({buyer: indexed(address), tokens_sold: indexed(uint256), eth_bought: indexed(uint256(wei))})
event EthPurchase(address buyer, uint256 tokens_sold, uint256 eth_bought);
constructor(ERC20Mock _token, uint256 _price) public payable {
token = _token;
price = _price; // in wei
}
/*
* @notice Convert Tokens to ETH.
* @dev User specifies maximum input and exact output.
* @param eth_bought Amount of ETH purchased.
* @param max_tokens Maximum Tokens sold.
* @param deadline Time after which this transaction can no longer be executed.
* @return Amount of Tokens sold.
* @public
* def tokenToEthSwapOutput(eth_bought: uint256(wei), max_tokens: uint256, deadline: timestamp) -> uint256:
*/
function tokenToEthSwapOutput(uint256 eth_bought, uint256 /*max_tokens*/, uint256 /*deadline*/) public returns(uint256 tokens_sold) {
tokens_sold = getTokenToEthOutputPrice(eth_bought);
token.transferFrom(msg.sender, address(this), tokens_sold);
msg.sender.transfer(eth_bought);
emit EthPurchase(msg.sender, tokens_sold, eth_bought);
return eth_bought;
}
function getTokenToEthOutputPrice(uint256 eth_bought) public view returns (uint256) {
return eth_bought * price / 10**18;
}
// /*
// * @notice Convert Tokens to ETH.
// * @dev User specifies exact input and minimum output.
// * @param tokens_sold Amount of Tokens sold.
// * @param min_eth Minimum ETH purchased.
// * @param deadline Time after which this transaction can no longer be executed.
// * @return Amount of ETH bought.
// * def tokenToEthSwapInput(tokens_sold: uint256, min_eth: uint256(wei), deadline: timestamp) -> uint256(wei):
// */
// function tokenToEthSwapInput(uint256 tokens_sold, uint256 min_eth, uint256 deadline) public returns(uint256) {
// token.transferFrom(msg.sender, address(this), tokens_sold);
// uint256 eth_bought = getTokenToEthInputPrice(tokens_sold);
// msg.sender.transfer(eth_bought);
// return eth_bought;
// }
// function getTokenToEthInputPrice(uint256 tokens_sold /* in wei */) public view returns (uint256 eth_bought) {
// return tokens_sold * price / 10**18;
// }
function setPrice(uint256 _price) external {
price = _price;
}
function() external payable {}
}