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精简DVMFunding

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This commit is contained in:
mingda
2020-11-24 19:18:03 +08:00
parent 937f89aaa6
commit ee07d6a5cc
1 changed files with 40 additions and 32 deletions
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72
contracts/DODOVendingMachine/impl/DVMFunding.sol
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@@ -13,7 +13,16 @@ 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) {
// shares [round down]
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");
@@ -21,50 +30,49 @@ contract DVMFunding is DVMVault {
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) {
// 包含了 baseReserve == 0 && quoteReserve == 0 的情况
// 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
if (totalSupply == 0) {
mintAmount = getBaseBalance(); // 以免出现balance很大但shares很小的情况
} else if (baseReserve > 0 && quoteReserve == 0) {
// case 2. supply when quote reserve is 0
mintAmount = baseInput.mul(totalSupply).div(baseReserve);
} else if (baseReserve > 0 && quoteReserve > 0) {
// case 3. normal case
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;
}
uint256 mintRatio = quoteInputRatio < baseInputRatio ? quoteInputRatio : baseInputRatio;
mintAmount = DecimalMath.mulFloor(totalSupply, mintRatio);
}
_mint(to, mintAmount);
_sync();
return (mintAmount,baseInput,quoteInput);
return (mintAmount, baseInput, quoteInput);
}
function sellShares(address to) external preventReentrant returns (uint256 baseAmount,uint256 quoteAmount) {
// withdraw amount [round down]
function sellShares(
uint256 shareAmount,
address to,
bytes calldata data
) external preventReentrant returns (uint256 baseAmount, uint256 quoteAmount) {
(uint256 baseBalance, uint256 quoteBalance) = getVaultBalance();
uint256 totalShares = totalSupply;
uint256 shareAmount = _SHARES_[address(this)];
require(shareAmount <= _SHARES_[msg.sender], "DLP_NOT_ENOUGH");
baseAmount = baseBalance.mul(shareAmount).div(totalShares);
quoteAmount = quoteBalance.mul(shareAmount).div(totalShares);
require(baseAmount > 0 && quoteAmount > 0, 'NO_DLP_INPUT');
_burn(address(this), shareAmount);
_burn(msg.sender, shareAmount);
_transferBaseOut(to, baseAmount);
_transferQuoteOut(to, quoteAmount);
if (data.length > 0) {
IDODOCallee(to).DVMSellShareCall(
msg.sender,
shareAmount,
baseAmount,
quoteAmount,
data
);
}
_sync();
}
}