restruct contract repo

2020-10-23 01:16:52 +08:00
parent 5f10f065e4
commit e8182dd1a1
53 changed files with 775 additions and 2575 deletions
--- a/contracts/DODOVenderMachine/impl/DVMFunding.sol
+++ b/contracts/DODOVenderMachine/impl/DVMFunding.sol
@@ -0,0 +1,69 @@
+/*
+
+    Copyright 2020 DODO ZOO.
+    SPDX-License-Identifier: Apache-2.0
+
+*/
+
+pragma solidity 0.6.9;
+pragma experimental ABIEncoderV2;
+
+import {DVMStorage} from "./DVMStorage.sol";
+import {DecimalMath} from "../../lib/DecimalMath.sol";
+
+contract DVMFunding is DVMStorage {
+    function buyShares(address account) external returns (uint256) {
+        uint256 baseInput = _VAULT_.getBaseInput();
+        uint256 quoteInput = _VAULT_.getQuoteInput();
+
+        require(baseInput > 0, "NO_BASE_INPUT");
+
+        uint256 baseReserve = _VAULT_._BASE_RESERVE_();
+        uint256 quoteReserve = _VAULT_._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(_VAULT_.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 = baseInputRatio > quoteInputRatio ? quoteInputRatio : baseInputRatio;
+            // 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 = _VAULT_.totalSupply();
+            if (totalShare > 0) {
+                mintAmount = DecimalMath.mulFloor(totalShare, mintRatio);
+            } else {
+                mintAmount = baseInput;
+            }
+        }
+
+        _VAULT_.mint(account, mintAmount);
+        _VAULT_.sync();
+    }
+
+    function sellShares(
+        address account,
+        address to,
+        uint256 amount
+    ) external returns (uint256) {
+        require(msg.sender == account, "PERMISSION_DENY");
+        require(_VAULT_.balanceOf(account) >= amount, "SHARES_NOT_ENOUGH");
+        (uint256 baseBalance, uint256 quoteBalance) = _VAULT_.getVaultBalance();
+        uint256 totalShares = _VAULT_.totalSupply();
+        _VAULT_.burn(account, amount);
+        _VAULT_.transferBaseOut(to, baseBalance.mul(amount).div(totalShares));
+        _VAULT_.transferQuoteOut(to, quoteBalance.mul(amount).div(totalShares));
+        _VAULT_.sync();
+    }
+}