Pool KickStarter
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mingda
191
contracts/PoolKickstarter/impl/CAFunding.sol
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191
contracts/PoolKickstarter/impl/CAFunding.sol
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/*
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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 {SafeMath} from "../../lib/SafeMath.sol";
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import {SafeERC20} from "../../lib/SafeERC20.sol";
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import {DecimalMath} from "../../lib/DecimalMath.sol";
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import {IERC20} from "../../intf/IERC20.sol";
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import {IDVM} from "../../DODOVendingMachine/intf/IDVM.sol";
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import {IDVMFactory} from "../../Factory/DVMFactory.sol";
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import {CAStorage} from "./CAStorage.sol";
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import {PMMPricing} from "../../lib/PMMPricing.sol";
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contract CAFunding is CAStorage {
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using SafeERC20 for IERC20;
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// ============ BID & CALM PHASE ============
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modifier isBidderAllow(address bidder) {
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require(_BIDDER_PERMISSION_.isAllowed(bidder), "BIDDER_NOT_ALLOWED");
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_;
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}
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function bid(address to) external phaseBid preventReentrant isBidderAllow(to) {
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uint256 input = _getQuoteInput();
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uint256 mtFee = DecimalMath.mulFloor(input, _MT_FEE_RATE_MODEL_.getFeeRate(to));
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_transferQuoteOut(_MAINTAINER_, mtFee);
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_mintShares(to, input.sub(mtFee));
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_sync();
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}
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function cancel(address assetTo, uint256 amount) external phaseBidOrCalm preventReentrant {
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require(_SHARES_[msg.sender] >= amount, "SHARES_NOT_ENOUGH");
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_burnShares(msg.sender, amount);
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_transferQuoteOut(assetTo, amount);
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_sync();
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}
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function _mintShares(address to, uint256 amount) internal {
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_SHARES_[to] = _SHARES_[to].add(amount);
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_TOTAL_SHARES_ = _TOTAL_SHARES_.add(amount);
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}
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function _burnShares(address from, uint256 amount) internal {
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_SHARES_[from] = _SHARES_[from].sub(amount);
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_TOTAL_SHARES_ = _TOTAL_SHARES_.sub(amount);
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}
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// ============ SETTLEMENT ============
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function settle() external phaseSettlement preventReentrant {
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require(!_SETTLED_, "ALREADY_SETTLED");
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_SETTLED_ = true;
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(uint256 poolBase, uint256 poolQuote, uint256 ownerQuote) = getSettleResult();
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_UNUSED_QUOTE_ = _QUOTE_TOKEN_.balanceOf(address(this)).sub(poolQuote).sub(ownerQuote);
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_UNUSED_BASE_ = _BASE_TOKEN_.balanceOf(address(this)).sub(poolBase);
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uint256 avgPrice = DecimalMath.divCeil(poolQuote.add(ownerQuote), _UNUSED_BASE_);
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// 这里的目的是让开盘价尽量等于avgPrice
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// 我们统一设定k=1，如果quote和base不平衡，就必然要截断一边
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// DVM截断了quote，所以如果进入池子的quote很多，就要把quote设置成DVM的base
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// m = avgPrice
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// i = m (1-quote/(m*base))
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// if quote = m*base i = 1
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// if quote > m*base reverse
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uint256 baseDepth = DecimalMath.mulFloor(avgPrice, poolBase);
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if (poolQuote == baseDepth) {
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_POOL_ = IDVMFactory(_POOL_FACTORY_).createDODOVendingMachine(
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address(this),
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address(_BASE_TOKEN_),
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address(_QUOTE_TOKEN_),
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3e15,
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0,
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1,
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DecimalMath.ONE
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);
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} else if (poolQuote < baseDepth) {
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uint256 ratio = DecimalMath.ONE.sub(DecimalMath.divFloor(poolQuote, baseDepth));
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_POOL_ = IDVMFactory(_POOL_FACTORY_).createDODOVendingMachine(
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address(this),
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address(_BASE_TOKEN_),
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address(_QUOTE_TOKEN_),
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3e15,
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0,
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avgPrice.mul(ratio).mul(ratio).divCeil(DecimalMath.ONE2),
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DecimalMath.ONE
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);
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} else if (poolQuote > baseDepth) {
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uint256 ratio = DecimalMath.ONE.sub(DecimalMath.divFloor(baseDepth, poolQuote));
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_POOL_ = IDVMFactory(_POOL_FACTORY_).createDODOVendingMachine(
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address(this),
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address(_QUOTE_TOKEN_),
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address(_BASE_TOKEN_),
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3e15,
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0,
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DecimalMath.reciprocalFloor(avgPrice).mul(ratio).mul(ratio).divCeil(
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DecimalMath.ONE2
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),
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DecimalMath.ONE
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);
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}
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_transferBaseOut(_POOL_, poolBase);
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_transferQuoteOut(_POOL_, poolQuote);
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_transferQuoteOut(_OWNER_, ownerQuote);
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IDVM(_POOL_).buyShares(address(this));
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}
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// in case something wrong with base token contract
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function emergencySettle() external phaseSettlement preventReentrant {
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require(!_SETTLED_, "ALREADY_SETTLED");
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require(
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block.timestamp > _PHASE_CALM_ENDTIME_.add(_SETTLEMENT_EXPIRED_TIME_),
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"NOT_EMERGENCY"
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);
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_SETTLED_ = true;
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_UNUSED_QUOTE_ = _QUOTE_TOKEN_.balanceOf(address(this));
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_UNUSED_BASE_ = _BASE_TOKEN_.balanceOf(address(this));
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}
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// ============ Pricing ============
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function getSettleResult()
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public
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view
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returns (
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uint256 poolBase,
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uint256 poolQuote,
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uint256 ownerQuote
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)
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{
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poolQuote = _QUOTE_TOKEN_.balanceOf(address(this));
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if (poolQuote > _POOL_QUOTE_CAP_) {
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poolQuote = _POOL_QUOTE_CAP_;
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}
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(uint256 soldBase, ) = PMMPricing.sellQuoteToken(_getPMMState(), poolQuote);
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poolBase = _TOTAL_BASE_.sub(soldBase);
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if (poolBase < _POOL_BASE_RESERVE_) {
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poolBase = _POOL_BASE_RESERVE_;
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}
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ownerQuote = DecimalMath.mulFloor(poolQuote, _OWNER_QUOTE_RATIO_);
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poolQuote = poolQuote.sub(ownerQuote);
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}
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function _getPMMState() internal view returns (PMMPricing.PMMState memory state) {
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state.i = _I_;
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state.K = _K_;
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state.B = _TOTAL_BASE_;
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state.Q = 0;
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state.B0 = state.B;
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state.Q0 = 0;
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state.R = PMMPricing.RState.ONE;
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}
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// ============ Asset In ============
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function _getQuoteInput() internal view returns (uint256 input) {
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return _QUOTE_TOKEN_.balanceOf(address(this)).sub(_QUOTE_RESERVE_);
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}
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// ============ Set States ============
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function _sync() internal {
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uint256 quoteBalance = _QUOTE_TOKEN_.balanceOf(address(this));
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if (quoteBalance != _QUOTE_RESERVE_) {
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_QUOTE_RESERVE_ = quoteBalance;
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}
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}
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// ============ Asset Out ============
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function _transferBaseOut(address to, uint256 amount) internal {
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if (amount > 0) {
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_BASE_TOKEN_.safeTransfer(to, amount);
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}
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}
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function _transferQuoteOut(address to, uint256 amount) internal {
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if (amount > 0) {
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_QUOTE_TOKEN_.safeTransfer(to, amount);
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}
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}
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}
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