71 lines
2.8 KiB
Solidity
71 lines
2.8 KiB
Solidity
/*
|
||
|
||
Copyright 2020 DODO ZOO.
|
||
SPDX-License-Identifier: Apache-2.0
|
||
|
||
*/
|
||
|
||
pragma solidity 0.6.9;
|
||
pragma experimental ABIEncoderV2;
|
||
|
||
import {DVMVault} from "./DVMVault.sol";
|
||
import {DecimalMath} from "../../lib/DecimalMath.sol";
|
||
import {IDODOCallee} from "../../intf/IDODOCallee.sol";
|
||
|
||
contract DVMFunding is DVMVault {
|
||
function buyShares(address to) external preventReentrant returns (uint256 shares,uint256 baseAmount,uint256 quoteAmount) {
|
||
uint256 baseInput = getBaseInput();
|
||
uint256 quoteInput = getQuoteInput();
|
||
require(baseInput > 0, "NO_BASE_INPUT");
|
||
uint256 baseReserve = _BASE_RESERVE_;
|
||
uint256 quoteReserve = _QUOTE_RESERVE_;
|
||
uint256 mintAmount;
|
||
// case 1. initial supply
|
||
if (baseReserve == 0 && quoteReserve == 0) {
|
||
mintAmount = baseInput;
|
||
}
|
||
// case 2. supply when quote reserve is 0
|
||
if (baseReserve > 0 && quoteReserve == 0) {
|
||
uint256 mintRatio = DecimalMath.divFloor(baseInput, baseReserve);
|
||
mintAmount = DecimalMath.mulFloor(totalSupply, mintRatio);
|
||
}
|
||
// case 3. normal case
|
||
if (baseReserve > 0 && quoteReserve > 0) {
|
||
uint256 baseInputRatio = DecimalMath.divFloor(baseInput, baseReserve);
|
||
uint256 quoteInputRatio = DecimalMath.divFloor(quoteInput, quoteReserve);
|
||
uint256 mintRatio;
|
||
if(baseInputRatio > quoteInputRatio){
|
||
mintRatio = quoteInputRatio;
|
||
baseInput = DecimalMath.mulFloor(baseInput, mintRatio);
|
||
}else {
|
||
mintRatio = baseInputRatio;
|
||
quoteInput = DecimalMath.mulFloor(quoteInput, mintRatio);
|
||
}
|
||
// 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
|
||
// 但有可能出现，reserve>0但totalSupply=0的场景
|
||
uint256 totalShare = totalSupply;
|
||
if (totalShare > 0) {
|
||
mintAmount = DecimalMath.mulFloor(totalShare, mintRatio);
|
||
} else {
|
||
mintAmount = baseInput;
|
||
}
|
||
}
|
||
_mint(to, mintAmount);
|
||
_sync();
|
||
return (mintAmount,baseInput,quoteInput);
|
||
}
|
||
|
||
function sellShares(address to) external preventReentrant returns (uint256 baseAmount,uint256 quoteAmount) {
|
||
(uint256 baseBalance, uint256 quoteBalance) = getVaultBalance();
|
||
uint256 totalShares = totalSupply;
|
||
uint256 shareAmount = _SHARES_[address(this)];
|
||
baseAmount = baseBalance.mul(shareAmount).div(totalShares);
|
||
quoteAmount = quoteBalance.mul(shareAmount).div(totalShares);
|
||
require(baseAmount > 0 && quoteAmount > 0, 'NO_DLP_INPUT');
|
||
_burn(address(this), shareAmount);
|
||
_transferBaseOut(to, baseAmount);
|
||
_transferQuoteOut(to, quoteAmount);
|
||
_sync();
|
||
}
|
||
}
|