140 lines
5.1 KiB
Solidity
140 lines
5.1 KiB
Solidity
/*
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Copyright 2020 DODO ZOO.
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SPDX-License-Identifier: Apache-2.0
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*/
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pragma solidity 0.8.16;
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import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
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import {IERC20Metadata} from "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
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import {GSPTrader} from "./GSPTrader.sol";
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import {GSPFunding} from "./GSPFunding.sol";
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import {GSPVault} from "./GSPVault.sol";
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/**
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* @title DODO GasSavingPool
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* @author DODO Breeder
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*
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* @notice DODO GasSavingPool initialization
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*/
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contract GSP is GSPTrader, GSPFunding {
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/**
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* @notice Function will be called in factory, init risk should not be included.
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* @param maintainer The dodo's address, who can claim mtFee and own this pool
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* @param admin oracle owner address, who can set price.
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* @param baseTokenAddress The base token address
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* @param quoteTokenAddress The quote token address
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* @param lpFeeRate The rate of lp fee, with 18 decimal
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* @param mtFeeRate The rate of mt fee, with 18 decimal
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* @param i The oracle price, possible to be changed only by maintainer
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* @param k The swap curve parameter
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* @param priceLimit The limit of the setting range of the I
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* @param isOpenTWAP Useless, always false, just for compatible with old version pool
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*/
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function init(
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address maintainer,
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address admin,
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address baseTokenAddress,
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address quoteTokenAddress,
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uint256 lpFeeRate,
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uint256 mtFeeRate,
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uint256 i,
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uint256 k,
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uint256 priceLimit,
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bool isOpenTWAP
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) external {
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// GSP can only be initialized once
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require(!_GSP_INITIALIZED_, "GSP_INITIALIZED");
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// _GSP_INITIALIZED_ is set to true after initialization
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_GSP_INITIALIZED_ = true;
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// baseTokenAddress and quoteTokenAddress should not be the same
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require(baseTokenAddress != quoteTokenAddress, "BASE_QUOTE_CAN_NOT_BE_SAME");
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// _BASE_TOKEN_ and _QUOTE_TOKEN_ should be valid ERC20 tokens
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_BASE_TOKEN_ = IERC20(baseTokenAddress);
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_QUOTE_TOKEN_ = IERC20(quoteTokenAddress);
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// i should be greater than 0 and less than 10**36
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require(i > 0 && i <= 10**36);
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_I_ = i;
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// k should be greater than 0 and less than 10**18
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require(k <= 10**18);
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_K_ = k;
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// _LP_FEE_RATE_ is set when initialization
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_LP_FEE_RATE_ = lpFeeRate;
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// _MT_FEE_RATE_ is set when initialization
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_MT_FEE_RATE_ = mtFeeRate;
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// _MAINTAINER_ is set when initialization, the address receives the fee
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_MAINTAINER_ = maintainer;
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_ADMIN_ = admin;
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_PRICE_LIMIT_ = priceLimit;
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// _IS_OPEN_TWAP_ is always false
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_IS_OPEN_TWAP_ = false;
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string memory connect = "_";
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string memory suffix = "GSP";
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// name of the shares is the combination of suffix, connect and string of the GSP
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name = string(abi.encodePacked(suffix, connect, addressToShortString(address(this))));
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// symbol of the shares is GLP
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symbol = "GLP";
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// decimals of the shares is the same as the base token decimals
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decimals = IERC20Metadata(baseTokenAddress).decimals();
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// initialize DOMAIN_SEPARATOR
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buildDomainSeparator();
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// ==========================================================================
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}
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// ============================== Permit ====================================
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/**
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* @notice DOMAIN_SEPARATOR is used for approve by signature
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*/
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function buildDomainSeparator() public returns (bytes32){
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string memory connect = "_";
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string memory suffix = "GSP";
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// name of the shares is the combination of suffix, connect and string of the GSP
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string memory name = string(abi.encodePacked(suffix, connect, addressToShortString(address(this))));
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DOMAIN_SEPARATOR = keccak256(
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abi.encode(
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// keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'),
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0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f,
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keccak256(bytes(name)),
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keccak256(bytes("1")),
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block.chainid,
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address(this)
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)
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);
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return DOMAIN_SEPARATOR;
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}
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/**
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* @notice Convert the address to a shorter string
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* @param _addr The address to convert
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* @return A string representation of _addr in hexadecimal
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*/
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function addressToShortString(address _addr) public pure returns (string memory) {
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bytes32 value = bytes32(uint256(uint160(_addr)));
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bytes memory alphabet = "0123456789abcdef";
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bytes memory str = new bytes(8);
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for (uint256 i = 0; i < 4; i++) {
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str[i * 2] = alphabet[uint8(value[i + 12] >> 4)];
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str[1 + i * 2] = alphabet[uint8(value[i + 12] & 0x0f)];
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}
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return string(str);
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}
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// ============ Version Control ============
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/**
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* @notice Return the version of DODOGasSavingPool
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* @return The current version is 1.0.1
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*/
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function version() external pure returns (string memory) {
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return "GSP 1.0.1";
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}
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}
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