From d4320ae360285f45724dde04e3aaa19e5af6f8e9 Mon Sep 17 00:00:00 2001
From: mingda <leimingda@pku.edu.cn>
Date: Tue, 8 Sep 2020 20:17:18 +0800
Subject: [PATCH] oracles

---
 ...l => ChainlinkEthUSDCPriceOracleProxy.sol} |  0
 .../ChainlinkEthUSDTPriceOracleProxy.sol      | 25 +++++++++++++++
 .../ChainlinkYFIUSDCPriceOracleProxy.sol      | 32 +++++++++++++++++++
 3 files changed, 57 insertions(+)
 rename contracts/helper/{ChainlinkEthPriceOracleProxy.sol => ChainlinkEthUSDCPriceOracleProxy.sol} (100%)
 create mode 100644 contracts/helper/ChainlinkEthUSDTPriceOracleProxy.sol
 create mode 100644 contracts/helper/ChainlinkYFIUSDCPriceOracleProxy.sol

diff --git a/contracts/helper/ChainlinkEthPriceOracleProxy.sol b/contracts/helper/ChainlinkEthUSDCPriceOracleProxy.sol
similarity index 100%
rename from contracts/helper/ChainlinkEthPriceOracleProxy.sol
rename to contracts/helper/ChainlinkEthUSDCPriceOracleProxy.sol
diff --git a/contracts/helper/ChainlinkEthUSDTPriceOracleProxy.sol b/contracts/helper/ChainlinkEthUSDTPriceOracleProxy.sol
new file mode 100644
index 0000000..6d27f7a
--- /dev/null
+++ b/contracts/helper/ChainlinkEthUSDTPriceOracleProxy.sol
@@ -0,0 +1,25 @@
+/*
+
+    Copyright 2020 DODO ZOO.
+    SPDX-License-Identifier: Apache-2.0
+
+*/
+
+pragma solidity 0.6.9;
+pragma experimental ABIEncoderV2;
+
+
+interface IChainlink {
+    function latestAnswer() external view returns (uint256);
+}
+
+
+// for WETH-USDT(decimals=6) price convert
+
+contract ChainlinkETHUSDTPriceOracleProxy {
+    address public chainlink = 0xEe9F2375b4bdF6387aa8265dD4FB8F16512A1d46;
+
+    function getPrice() external view returns (uint256) {
+        return 10**24 / IChainlink(chainlink).latestAnswer();
+    }
+}
diff --git a/contracts/helper/ChainlinkYFIUSDCPriceOracleProxy.sol b/contracts/helper/ChainlinkYFIUSDCPriceOracleProxy.sol
new file mode 100644
index 0000000..b2d071d
--- /dev/null
+++ b/contracts/helper/ChainlinkYFIUSDCPriceOracleProxy.sol
@@ -0,0 +1,32 @@
+/*
+
+    Copyright 2020 DODO ZOO.
+    SPDX-License-Identifier: Apache-2.0
+
+*/
+
+pragma solidity 0.6.9;
+pragma experimental ABIEncoderV2;
+
+import {SafeMath} from "../lib/SafeMath.sol";
+
+
+interface IChainlink {
+    function latestAnswer() external view returns (uint256);
+}
+
+
+// for YFI-USDC(decimals=6) price convert
+
+contract ChainlinkYFIUSDCPriceOracleProxy {
+    using SafeMath for uint256;
+
+    address public yfiEth = 0x7c5d4F8345e66f68099581Db340cd65B078C41f4;
+    address public EthUsd = 0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419;
+
+    function getPrice() external view returns (uint256) {
+        uint256 yfiEthPrice = IChainlink(yfiEth).latestAnswer();
+        uint256 EthUsdPrice = IChainlink(EthUsd).latestAnswer();
+        return yfiEthPrice.mul(EthUsdPrice).div(10**20);
+    }
+}