snapshot

2021-03-18 19:54:58 +08:00
parent 31bb352fa9
commit a8ec3a040a
5 changed files with 372 additions and 0 deletions
--- a/contracts/GeneralizedFragment/Fragment.sol
+++ b/contracts/GeneralizedFragment/Fragment.sol
@@ -0,0 +1,96 @@
+/*
+
+    Copyright 2020 DODO ZOO.
+    SPDX-License-Identifier: Apache-2.0
+
+*/
+
+pragma solidity 0.6.9;
+
+import {SafeMath} from "../lib/SafeMath.sol";
+import {SafeERC20} from "../lib/SafeERC20.sol";
+import {DecimalMath} from "../../lib/DecimalMath.sol";
+import {InitializableOwnable} from "../lib/InitializableOwnable.sol";
+import {IDVM} from "../DODOVendingMachine/intf/IDVM.sol";
+import {ICloneFactory} from "../lib/CloneFactory.sol";
+import {IERC20} from "../intf/IERC20.sol";
+
+contract Fragment is InitializableMintableERC20 {
+    using SafeMath for uint256;
+    using SafeTransfer for IERC20;
+
+    uint256 _BUYOUT_TIMESTAMP_;
+
+    address _COLLATERAL_VAULT_;
+    address _QUOTE_;
+    address _DVM_;
+    bool _IS_BUYOUT_;
+    uint256 _BUYOUT_PRICE_;
+
+    function init(
+      address owner, 
+      address dvm, 
+      address collateralVault, 
+      uint256 supply, 
+      uint256 ownerRatio
+    ) external {
+        // init local variables
+        initOwner(owner);
+        _DVM_ = dvm;
+        _COLLATERAL_VAULT_ = collateralVault;
+        _QUOTE_ = IDVM(DVM)._QUOTE_TOKEN_();
+
+        // init FRAM meta data
+        string memory suffix = "FRAG_";
+        name = string(abi.encodePacked(suffix, IDVM(_DVM_).addressToShortString(_COLLATERAL_VAULT_));
+        symbol = "FRAG";
+        decimals = 18;
+
+        // init FRAG distribution
+        totalSupply = supply;
+        balances[owner] = DecimalMath.mulFloor(supply, ownerRatio);
+        balances[dvm] = supply.sub( balances[owner]);
+        emit Transfer(address(0), owner, balances[owner]);
+        emit Transfer(address(0), dvm, balances[dvm]);
+
+        // init DVM liquidity
+        IDVM(DVM).buyShares(address(this));
+    }
+
+    function buyout() external {
+      _IS_BUYOUT_ = true;
+      _BUYOUT_PRICE_ = IDVM(_DVM_).getMidPrice();
+      uint256 requireQuote = DecimalMath.mulCeil(_BUYOUT_PRICE_, totalSupply);
+      require(IERC20(_QUOTE_).balanceOf(address(this))>=requireQuote, "QUOTE NOT ENOUGH");
+
+      IDVM(_DVM_).sellShares(
+        IERC20(_DVM_).balanceOf(address(this)),
+        address(this),
+        0,
+        0,
+        "",
+        uint256(-1)
+      );
+
+      uint256 ownerQuote = DecimalMath.mulFloor(_BUYOUT_PRICE_, balances[address(this)])
+      _clearSelfBalance();
+
+      IERC20(_QUOTE_).safeTransfer(ownerQuote, _OWNER_);
+    }
+
+    // buyout之后的恒定兑换
+    function redeem(address to) external {
+      IERC20(_QUOTE_).safeTransfer(DecimalMath.mulFloor(_BUYOUT_PRICE_, balances[address(this)]), to);
+      _clearSelfBalance();
+    }
+
+    function getBuyoutRequire() view return (uint256 requireQuote){
+      uint256 price = IDVM(_DVM_).getMidPrice();
+      requireQuote = DecimalMath.mulCeil(price, totalSupply);
+    }
+
+    function _clearSelfBalance() internal {
+      emit Transfer(address(this), address(0), balances[address(this)]);
+      balances[address(this)] = 0;
+    }
+}