From df52cd3e1c3d34e32df902f33ed8e5871f7e9bd8 Mon Sep 17 00:00:00 2001
From: Thrilok kumar <thrilokkumar@Thriloks-MacBook-Pro.local>
Date: Fri, 1 Nov 2019 05:23:00 +0530
Subject: [PATCH] mcd read contract

---
 contracts/Read/InstaMcdRead.sol | 123 ++++++++++++++++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 contracts/Read/InstaMcdRead.sol

diff --git a/contracts/Read/InstaMcdRead.sol b/contracts/Read/InstaMcdRead.sol
new file mode 100644
index 0000000..039b396
--- /dev/null
+++ b/contracts/Read/InstaMcdRead.sol
@@ -0,0 +1,123 @@
+pragma solidity ^0.5.8;
+pragma experimental ABIEncoderV2;
+
+interface ManagerLike {
+    function cdpCan(address, uint, address) external view returns (uint);
+    function ilks(uint) external view returns (bytes32);
+    function owns(uint) external view returns (address);
+    function urns(uint) external view returns (address);
+    function vat() external view returns (address);
+}
+
+interface CdpsLike {
+    function getCdpsAsc(address, address) external view returns (uint[] memory, address[] memory, bytes32[] memory);
+}
+
+interface VatLike {
+    function can(address, address) external view returns (uint);
+    function ilks(bytes32) external view returns (uint, uint, uint, uint, uint);
+    function dai(address) external view returns (uint);
+    function urns(bytes32, address) external view returns (uint, uint);
+
+}
+
+
+contract DSMath {
+
+    function add(uint x, uint y) internal pure returns (uint z) {
+        require((z = x + y) >= x, "math-not-safe");
+    }
+
+    function sub(uint x, uint y) internal pure returns (uint z) {
+        z = x - y <= x ? x - y : 0;
+    }
+
+    function mul(uint x, uint y) internal pure returns (uint z) {
+        require(y == 0 || (z = x * y) / y == x, "math-not-safe");
+    }
+
+    uint constant WAD = 10 ** 18;
+    uint constant RAY = 10 ** 27;
+
+    function rmul(uint x, uint y) internal pure returns (uint z) {
+        z = add(mul(x, y), RAY / 2) / RAY;
+    }
+
+    function wmul(uint x, uint y) internal pure returns (uint z) {
+        z = add(mul(x, y), WAD / 2) / WAD;
+    }
+
+    function rdiv(uint x, uint y) internal pure returns (uint z) {
+        z = add(mul(x, RAY), y / 2) / y;
+    }
+
+    function wdiv(uint x, uint y) internal pure returns (uint z) {
+        z = add(mul(x, WAD), y / 2) / y;
+    }
+
+}
+
+
+contract Helpers is DSMath {
+
+    struct CdpData {
+        uint id;
+        address owner;
+        bytes32 ilk;
+        uint ink;
+        uint art;
+        uint debt;
+        address urn;
+    }
+
+}
+
+
+contract McdResolver is Helpers {
+    function getCdpsByAddress(address manager, address cdpManger, address owner) external view returns (CdpData[] memory) {
+        (uint[] memory ids, address[] memory urns, bytes32[] memory ilks) = CdpsLike(cdpManger).getCdpsAsc(manager, owner);
+        CdpData[] memory cdps = new CdpData[](ids.length);
+
+        for (uint i = 0; i < ids.length; i++) {
+            (uint ink, uint art) = VatLike(ManagerLike(manager).vat()).urns(ilks[i], urns[i]);
+            (,uint rate,,,) = VatLike(ManagerLike(manager).vat()).ilks(ilks[i]);
+            uint debt = rmul(art,rate);
+            cdps[i] = CdpData(
+                ids[i],
+                owner,
+                ilks[i],
+                ink,
+                art,
+                debt,
+                urns[i]
+            );
+        }
+        return cdps;
+    }
+
+    function getCdpsById(address manager, uint id) external view returns (CdpData memory) {
+        address urn = ManagerLike(manager).urns(id);
+        bytes32 ilk = ManagerLike(manager).ilks(id);
+        address owner = ManagerLike(manager).owns(id);
+
+        (uint ink, uint art) = VatLike(ManagerLike(manager).vat()).urns(ilk, urn);
+        (,uint rate,,,) = VatLike(ManagerLike(manager).vat()).ilks(ilk);
+        uint debt = rmul(art,rate);
+
+        CdpData memory cdp = CdpData(
+            id,
+            owner,
+            ilk,
+            ink,
+            art,
+            debt,
+            urn
+        );
+        return cdp;
+    }
+
+    function getIlkData(address manager, bytes32 ilk) external view returns (uint rate) {
+        (,rate,,,) = VatLike(ManagerLike(manager).vat()).ilks(ilk);
+    }
+
+}