70 lines
2.5 KiB
Solidity
70 lines
2.5 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 {DVMStorage} from "./DVMStorage.sol";
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import {DecimalMath} from "../../lib/DecimalMath.sol";
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contract DVMFunding is DVMStorage {
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function buyShares(address account) external returns (uint256) {
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uint256 baseInput = _VAULT_.getBaseInput();
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uint256 quoteInput = _VAULT_.getQuoteInput();
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require(baseInput > 0, "NO_BASE_INPUT");
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uint256 baseReserve = _VAULT_._BASE_RESERVE_();
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uint256 quoteReserve = _VAULT_._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(_VAULT_.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 = _VAULT_.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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_VAULT_.mint(account, mintAmount);
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_VAULT_.sync();
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}
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function sellShares(
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address account,
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address to,
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uint256 amount
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) external returns (uint256) {
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require(msg.sender == account, "PERMISSION_DENY");
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require(_VAULT_.balanceOf(account) >= amount, "SHARES_NOT_ENOUGH");
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(uint256 baseBalance, uint256 quoteBalance) = _VAULT_.getVaultBalance();
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uint256 totalShares = _VAULT_.totalSupply();
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_VAULT_.burn(account, amount);
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_VAULT_.transferBaseOut(to, baseBalance.mul(amount).div(totalShares));
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_VAULT_.transferQuoteOut(to, quoteBalance.mul(amount).div(totalShares));
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_VAULT_.sync();
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}
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}
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