77 lines
2.9 KiB
Solidity
77 lines
2.9 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 {DVMVault} from "./DVMVault.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 DVMFunding is DVMVault {
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function buyShares(address to) external preventReentrant returns (uint256) {
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uint256 baseInput = getBaseInput();
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uint256 quoteInput = getQuoteInput();
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require(baseInput > 0, "NO_BASE_INPUT");
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uint256 baseReserve = _BASE_RESERVE_;
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uint256 quoteReserve = _QUOTE_RESERVE_;
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uint256 mintAmount;
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// case 1. initial supply
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if (baseReserve == 0 && quoteReserve == 0) {
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mintAmount = baseInput;
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}
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// case 2. supply when quote reserve is 0
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if (baseReserve > 0 && quoteReserve == 0) {
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uint256 mintRatio = DecimalMath.divFloor(baseInput, baseReserve);
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mintAmount = DecimalMath.mulFloor(totalSupply, mintRatio);
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}
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// case 3. normal case
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if (baseReserve > 0 && quoteReserve > 0) {
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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 = baseInputRatio > quoteInputRatio ? quoteInputRatio : baseInputRatio;
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// 在提币的时候向下取整。因此永远不会出现，balance为0但totalsupply不为0的情况
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// 但有可能出现，reserve>0但totalSupply=0的场景
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uint256 totalShare = totalSupply;
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if (totalShare > 0) {
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mintAmount = DecimalMath.mulFloor(totalShare, mintRatio);
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} else {
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mintAmount = baseInput;
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}
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}
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_mint(to, mintAmount);
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_sync();
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}
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//TODO:Router unwrap WETH
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function sellShares(
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address to
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// uint256 shareAmount,
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// bytes calldata data
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) external preventReentrant returns (uint256) {
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// require(_SHARES_[msg.sender] >= shareAmount, "SHARES_NOT_ENOUGH");
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(uint256 baseBalance, uint256 quoteBalance) = getVaultBalance();
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uint256 totalShares = totalSupply;
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uint256 shareAmount = _SHARES_[address(this)];
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uint256 baseAmount = baseBalance.mul(shareAmount).div(totalShares);
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uint256 quoteAmount = quoteBalance.mul(shareAmount).div(totalShares);
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require(baseAmount > 0 && quoteAmount > 0, 'NO_DLP_INPUT');
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_burn(address(this), 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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// IDODOCallee(msg.sender).DVMSellShareCall(
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// to,
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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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}
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