From 15e4ac77ca58dc98e86d1261cf100d992834a647 Mon Sep 17 00:00:00 2001
From: Thrilok Kumar <thrilok2000@gmail.com>
Date: Tue, 6 Apr 2021 03:14:17 +0530
Subject: [PATCH] Added chainlink resolver

---
 contracts/protocols/chainlink_aggregator.sol | 63 ++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 contracts/protocols/chainlink_aggregator.sol

diff --git a/contracts/protocols/chainlink_aggregator.sol b/contracts/protocols/chainlink_aggregator.sol
new file mode 100644
index 0000000..41f03b9
--- /dev/null
+++ b/contracts/protocols/chainlink_aggregator.sol
@@ -0,0 +1,63 @@
+pragma solidity ^0.7.0;
+pragma experimental ABIEncoderV2;
+
+interface ChainLinkInterface {
+    function latestAnswer() external view returns (int256);
+    function decimals() external view returns (uint256);
+}
+
+contract Basic {
+    ChainLinkInterface ethUsdPriceFeed = ChainLinkInterface(0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419);
+    // ChainLinkInterface ethUsdPriceFeed = ChainLinkInterface(0x9326BFA02ADD2366b30bacB125260Af641031331);
+    
+    function toUint256(bytes memory _bytes)   
+    internal
+    pure
+    returns (uint256 value) {
+
+        assembly {
+        value := mload(add(_bytes, 0x20))
+        }
+    }
+}
+
+contract Resolver is Basic {
+    struct PriceData {
+        uint price;
+        uint decimals;
+        bool status;
+    }
+
+    function getPrices(address[] memory priceFeeds)
+    public
+    view
+    returns (
+        PriceData memory ethPriceInUsd,
+        PriceData[] memory tokensPriceInETH
+    ) {
+        tokensPriceInETH = new PriceData[](priceFeeds.length);
+        for (uint i = 0; i < priceFeeds.length; i++) {
+            (bool priceStatus, bytes memory priceData) =  priceFeeds[i].staticcall(abi.encodeWithSignature("latestAnswer()"));
+            (bool decimalstatus, bytes memory decimalsData) =  priceFeeds[i].staticcall(abi.encodeWithSignature("decimals()"));
+            tokensPriceInETH[i] = PriceData({
+                price: address(ethUsdPriceFeed) == priceFeeds[i] ? 1 : toUint256(priceData),
+                decimals: toUint256(decimalsData),
+                status: priceStatus && decimalstatus
+            });
+        }
+
+        (bool priceStatus, bytes memory priceData) =  address(ethUsdPriceFeed).staticcall(abi.encodeWithSignature("latestAnswer()"));
+        (bool decimalstatus, bytes memory decimalsData) =  address(ethUsdPriceFeed).staticcall(abi.encodeWithSignature("decimals()"));
+
+
+        ethPriceInUsd = PriceData({
+                price: toUint256(priceData),
+                decimals: toUint256(decimalsData),
+                status: priceStatus && decimalstatus
+            });
+    }
+}
+
+contract InstaChainLinkResolver is Resolver {
+    string public constant name = "ChainLink-Aggregator-Resolver-v1";
+}
\ No newline at end of file