119 lines
4.4 KiB
Solidity
119 lines
4.4 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 0.6.9;
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pragma experimental ABIEncoderV2;
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import {DSPVault} from "./DSPVault.sol";
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import {DecimalMath} from "../../lib/DecimalMath.sol";
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import {IDODOCallee} from "../../intf/IDODOCallee.sol";
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contract DSPFunding is DSPVault {
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// ============ Events ============
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event BuyShares(address to, uint256 increaseShares, uint256 totalShares);
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event SellShares(address payer, address to, uint256 decreaseShares, uint256 totalShares);
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// ============ Buy & Sell Shares ============
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// buy shares [round down]
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function buyShares(address to)
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external
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preventReentrant
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returns (
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uint256 shares,
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uint256 baseInput,
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uint256 quoteInput
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)
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{
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uint256 baseBalance = _BASE_TOKEN_.balanceOf(address(this));
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uint256 quoteBalance = _QUOTE_TOKEN_.balanceOf(address(this));
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uint256 baseReserve = _BASE_RESERVE_;
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uint256 quoteReserve = _QUOTE_RESERVE_;
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baseInput = baseBalance.sub(baseReserve);
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quoteInput = quoteBalance.sub(quoteReserve);
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require(baseInput > 0, "NO_BASE_INPUT");
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// Round down when withdrawing. Therefore, never be a situation occuring balance is 0 but totalsupply is not 0
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// But May Happen，reserve >0 But totalSupply = 0
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if (totalSupply == 0) {
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// case 1. initial supply
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require(_QUOTE_TARGET_ > 0, "QUOTE_TARGET_IS_ZERO");
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require(quoteBalance > 0, "ZERO_QUOTE_AMOUNT");
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shares = quoteBalance < DecimalMath.mulFloor(baseBalance, _I_)
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? DecimalMath.divFloor(quoteBalance, _I_)
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: baseBalance;
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_BASE_TARGET_ = uint112(shares);
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_QUOTE_TARGET_ = uint112(DecimalMath.mulFloor(shares, _I_));
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require(shares > 2001, "MINT_AMOUNT_NOT_ENOUGH");
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_mint(address(0), 1001);
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shares -= 1001;
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} else if (baseReserve > 0 && quoteReserve > 0) {
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// case 2. normal case
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uint256 baseInputRatio = DecimalMath.divFloor(baseInput, baseReserve);
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uint256 quoteInputRatio = DecimalMath.divFloor(quoteInput, quoteReserve);
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uint256 mintRatio = quoteInputRatio < baseInputRatio ? quoteInputRatio : baseInputRatio;
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shares = DecimalMath.mulFloor(totalSupply, mintRatio);
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_BASE_TARGET_ = uint112(uint256(_BASE_TARGET_).add(DecimalMath.mulFloor(uint256(_BASE_TARGET_), mintRatio)));
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_QUOTE_TARGET_ = uint112(uint256(_QUOTE_TARGET_).add(DecimalMath.mulFloor(uint256(_QUOTE_TARGET_), mintRatio)));
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}
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_mint(to, shares);
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_setReserve(baseBalance, quoteBalance);
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emit BuyShares(to, shares, _SHARES_[to]);
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}
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// sell shares [round down]
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function sellShares(
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uint256 shareAmount,
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address to,
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uint256 baseMinAmount,
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uint256 quoteMinAmount,
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bytes calldata data,
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uint256 deadline
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) external preventReentrant returns (uint256 baseAmount, uint256 quoteAmount) {
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require(deadline >= block.timestamp, "TIME_EXPIRED");
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require(shareAmount <= _SHARES_[msg.sender], "DLP_NOT_ENOUGH");
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require(to != address(this), "SELL_BACK_NOT_ALLOWED");
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uint256 baseBalance = _BASE_TOKEN_.balanceOf(address(this));
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uint256 quoteBalance = _QUOTE_TOKEN_.balanceOf(address(this));
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uint256 totalShares = totalSupply;
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baseAmount = baseBalance.mul(shareAmount).div(totalShares);
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quoteAmount = quoteBalance.mul(shareAmount).div(totalShares);
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_BASE_TARGET_ = uint112(uint256(_BASE_TARGET_).sub(uint256(_BASE_TARGET_).mul(shareAmount).divCeil(totalShares)));
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_QUOTE_TARGET_ = uint112(uint256(_QUOTE_TARGET_).sub(uint256(_QUOTE_TARGET_).mul(shareAmount).divCeil(totalShares)));
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require(
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baseAmount >= baseMinAmount && quoteAmount >= quoteMinAmount,
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"WITHDRAW_NOT_ENOUGH"
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);
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_burn(msg.sender, shareAmount);
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_transferBaseOut(to, baseAmount);
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_transferQuoteOut(to, quoteAmount);
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_sync();
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if (data.length > 0) {
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//Same as DVM
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IDODOCallee(to).DVMSellShareCall(
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msg.sender,
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shareAmount,
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baseAmount,
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quoteAmount,
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data
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);
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}
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emit SellShares(msg.sender, to, shareAmount, _SHARES_[msg.sender]);
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}
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}
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