Merge pull request #75 from Instadapp/fantom-support-changes

Fantom Refactored code

contracts/aggregator/fantom/flashloan/helper.sol

@@ -3,7 +3,7 @@ pragma solidity ^0.8.0;
 import "../../../common/helpers.sol";
 import "./variable.sol";
 
-contract Helper is Variables, HelpersCommon {
+contract Helper is Variables, TokenHelpers, FlashloanHelpers {
     using SafeERC20 for IERC20;
 
     /**
@@ -15,77 +15,60 @@ contract Helper is Variables, HelpersCommon {
         return instaList.accountID(_account) > 0;
     }
 
-    /**
-     * @dev Approves the tokens to the receiver address with allowance (amount + fee).
-     * @notice Approves the tokens to the receiver address with allowance (amount + fee).
-     * @param _instaLoanVariables struct which includes list of token addresses and amounts.
-     * @param _fees list of premiums/fees for the corresponding addresses for flashloan.
-     * @param _receiver address to which tokens have to be approved.
+     /**
+     * @dev Returns fee for the passed route in BPS.
+     * @notice Returns fee for the passed route in BPS. 1 BPS == 0.01%.
+     * @param _route route number for flashloan.
      */
-    function safeApprove(
-        FlashloanVariables memory _instaLoanVariables,
-        uint256[] memory _fees,
-        address _receiver
-    ) internal {
-        uint256 length_ = _instaLoanVariables._tokens.length;
-        require(length_ == _instaLoanVariables._amounts.length, 'Lengths of parameters not same');
-        require(length_ == _fees.length, 'Lengths of parameters not same');
-        for (uint256 i = 0; i < length_; i++) {
-            approve(_instaLoanVariables._tokens[i], _receiver, _instaLoanVariables._amounts[i] + _fees[i]);
-        }
+    function calculateFeeBPS(uint256 _route)
+        public
+        view
+        virtual
+        returns (uint256 BPS_)
+    {
+        bytes memory _output = Address.functionStaticCall(
+            routeToImplementation[_route],
+            msg.data,
+            "calculateFeeBPS-call-failed"
+        );
+        BPS_ = abi.decode(_output, (uint256));
     }
 
     /**
-     * @dev Transfers the tokens to the receiver address.
-     * @notice Transfers the tokens to the receiver address.
-     * @param _instaLoanVariables struct which includes list of token addresses and amounts.
-     * @param _receiver address to which tokens have to be transferred.
+     * @dev Function to get the list of all routes.
+     * @notice Function to get the list of all routes.
      */
-    function safeTransfer(FlashloanVariables memory _instaLoanVariables, address _receiver) internal {
-        uint256 length_ = _instaLoanVariables._tokens.length;
-        require(length_ == _instaLoanVariables._amounts.length, 'Lengths of parameters not same');
-        for (uint256 i = 0; i < length_; i++) {
-            IERC20 token = IERC20(_instaLoanVariables._tokens[i]);
-            token.safeTransfer(_receiver, _instaLoanVariables._amounts[i]);
-        }
+    function getRoutes() public view returns (uint256[] memory) {
+        return routes;
     }
 
     /**
-     * @dev Validates if the receiver sent the correct amounts of funds.
-     * @notice Validates if the receiver sent the correct amounts of funds.
-     * @param _instaLoanVariables struct which includes list of initial balances, final balances and fees for the respective tokens.
+     * @dev Function to get the list of enabled routes.
+     * @notice Function to get the list of enabled routes.
      */
-    function validateFlashloan(FlashloanVariables memory _instaLoanVariables) internal pure {
-        for (uint256 i = 0; i < _instaLoanVariables._iniBals.length; i++) {
-            require(
-                _instaLoanVariables._iniBals[i] + _instaLoanVariables._instaFees[i] <= _instaLoanVariables._finBals[i],
-                'amount-paid-less'
-            );
+    function getEnabledRoutes()
+        public
+        view
+        returns (uint16[] memory routesEnabled_)
+    {
+        uint256[] memory routesAll_ = getRoutes();
+        uint256 length = routesAll_.length;
+        uint256 _count = 0;
+
+        for (uint256 i = 0; i < length; i++) {
+            if (routeStatus[routesAll_[i]] == true) {
+                _count++;
+            }
         }
-    }
 
-    /**
-     * @dev  better checking by double encoding the data.
-     * @notice better checking by double encoding the data.
-     * @param data_ data passed.
-     */
-    modifier verifyDataHash(bytes memory data_) {
-        bytes32 dataHash_ = keccak256(data_);
-        require(dataHash_ == dataHash && dataHash_ != bytes32(0), 'invalid-data-hash');
-        require(status == 2, 'already-entered');
-        dataHash = bytes32(0);
-        _;
-        status = 1;
-    }
+        routesEnabled_ = new uint16[](_count);
+        uint256 k = 0;
 
-    /**
-     * @dev reentrancy gaurd.
-     * @notice reentrancy gaurd.
-     */
-    modifier reentrancy() {
-        require(status == 1, 'already-entered');
-        status = 2;
-        _;
-        require(status == 1, 'already-entered');
+        for (uint256 j = 0; j < length; j++) {
+            if (routeStatus[routesAll_[j]]) {
+                routesEnabled_[k] = uint16(routesAll_[j]);
+                k++;
+            }
+        }
     }
 }

contracts/aggregator/fantom/flashloan/main.sol

@@ -1,7 +1,6 @@
 //SPDX-License-Identifier: Unlicense
 pragma solidity ^0.8.0;
 import "./helper.sol";
-import "../../../common/main.sol";
 
 /**
  * @title Flashloan.
@@ -20,15 +19,6 @@ contract AdminModule is Helper {
 
     event LogCollectRevenue(address to, address[] tokens, uint256[] amounts);
 
-    /**
-     * @dev owner gaurd.
-     * @notice owner gaurd.
-     */
-    modifier onlyOwner() {
-        require(msg.sender == owner, "not-owner");
-        _;
-    }
-
     /**
      * @dev Update owner.
      * @notice Update owner.
@@ -146,7 +136,7 @@ contract AdminModule is Helper {
     }
 }
 
-contract FlashAggregatorFantom is FlashloanAggregator, AdminModule {
+contract FlashAggregatorFantom is AdminModule {
     event LogFlashloan(address indexed account, uint256 indexed route, address[] tokens, uint256[] amounts);
 
     /**

contracts/aggregator/fantom/flashloan/routes/aaveV3/main.sol

@@ -16,14 +16,14 @@ interface IAaveV3Lending {
     function FLASHLOAN_PREMIUM_TOTAL() external view returns (uint128);
 }
 
-contract AaveV3Variables {
+contract AaveV3ConstantVariables {
     address public constant aaveV3LendingAddr =
         0x794a61358D6845594F94dc1DB02A252b5b4814aD;
     IAaveV3Lending public constant aaveV3Lending =
         IAaveV3Lending(aaveV3LendingAddr);
 }
 
-contract AaveImplementationFantom is Helper, AaveV3Variables {
+contract AaveV3RouteImplementationFantom is AaveV3ConstantVariables, Helper {
     /**
      * @dev Main function for flashloan for all routes. Calls the middle functions according to routes.
      * @notice Main function for flashloan for all routes. Calls the middle functions according to routes.
@@ -53,6 +53,7 @@ contract AaveImplementationFantom is Helper, AaveV3Variables {
     function calculateFeeBPS(uint256 _route)
         public
         view
+        override
         returns (uint256 BPS_)
     {
         if (_route == 9) {

contracts/aggregator/fantom/flashloan/routes/fla/main.sol

@@ -32,6 +32,7 @@ contract FLAImplementationFantom is Helper {
     function calculateFeeBPS(uint256 _route)
         public
         view
+        override
         returns (uint256 BPS_)
     {
         if (_route == 10) {

contracts/aggregator/fantom/flashloan/variable.sol

@@ -1,26 +1,51 @@
 //SPDX-License-Identifier: Unlicense
 pragma solidity ^0.8.0;
-import "../../../common/variables.sol";
+
+import "../../../common/interfaces.sol";
+import "../../../common/variablesV1.sol";
+import "../../../common/variablesV2.sol";
+import "../../../common/structs.sol";
 
 contract ConstantVariables {
     address public constant treasuryAddr =
         0x6C4061A00F8739d528b185CC683B6400E0cd396a;
     ListInterface public constant instaList = ListInterface(0x10e166c3FAF887D8a61dE6c25039231eE694E926);
+    uint256 public constant InstaFeeBPS = 5; // in BPS; 1 BPS = 0.01%
 }
 
-contract Variables is ConstantVariables {
-
-    bytes32 internal dataHash;
-    // if 1 then can enter flashlaon, if 2 then callback
-    uint256 internal status;
+contract FantomVariablesV1 {
+    address public owner;
 
-    struct FlashloanVariables {
-        address[] _tokens;
-        uint256[] _amounts;
-        uint256[] _iniBals;
-        uint256[] _finBals;
-        uint256[] _instaFees;
+    /**
+     * @dev owner gaurd.
+     * @notice owner gaurd.
+     */
+    modifier onlyOwner() {
+        require(msg.sender == owner, "not-owner");
+        _;
     }
-
-    address public owner;
 }
+
+contract Variables is ConstantVariables, CommonVariablesV1, Structs, FantomVariablesV1, CommonVariablesV2 {
+    // ******** Stroage Variable layout ******* //
+
+    /* CommonVariablesV1
+        // bytes32 internal dataHash;
+        // uint256 internal status;
+    */
+
+    /* Structs
+        FlashloanVariables;
+    */
+
+    /* FantomVariablesV1
+        // address public owner;
+    */
+
+    /* CommonVariablesV2
+        // mapping(uint256 => address) public routeToImplementation;
+        // mapping(uint256 => bool) public routeStatus;
+        // address internal fallbackImplementation;
+        // uint256[] public routes;
+    */
+}

contracts/common/helpers.sol

@@ -2,9 +2,11 @@
 pragma solidity ^0.8.0;
 
 import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';
-import './variables.sol';
+import "./interfaces.sol";
+import "./variablesV2.sol";
+import "./structs.sol";
 
-contract HelpersCommon is VariablesCommon {
+contract TokenHelpers is Structs {
     using SafeERC20 for IERC20;
 
     /**
@@ -54,6 +56,56 @@ contract HelpersCommon is VariablesCommon {
         }
     }
 
+    /**
+     * @dev Sort the tokens and amounts arrays according to token addresses.
+     * @notice Sort the tokens and amounts arrays according to token addresses.
+     * @param _token0 address of token0.
+     * @param _token1 address of token1.
+     */
+    function sortTokens(address _token0, address _token1) internal pure returns (address, address) {
+        if (_token1 < _token0) {
+            (_token0, _token1) = (_token1, _token0);
+        }
+        return (_token0, _token1);
+    }
+
+    /**
+     * @dev Approves the tokens to the receiver address with allowance (amount + fee).
+     * @notice Approves the tokens to the receiver address with allowance (amount + fee).
+     * @param _instaLoanVariables struct which includes list of token addresses and amounts.
+     * @param _fees list of premiums/fees for the corresponding addresses for flashloan.
+     * @param _receiver address to which tokens have to be approved.
+     */
+    function safeApprove(
+        FlashloanVariables memory _instaLoanVariables,
+        uint256[] memory _fees,
+        address _receiver
+    ) internal {
+        uint256 length_ = _instaLoanVariables._tokens.length;
+        require(length_ == _instaLoanVariables._amounts.length, 'Lengths of parameters not same');
+        require(length_ == _fees.length, 'Lengths of parameters not same');
+        for (uint256 i = 0; i < length_; i++) {
+            approve(_instaLoanVariables._tokens[i], _receiver, _instaLoanVariables._amounts[i] + _fees[i]);
+        }
+    }
+
+    /**
+     * @dev Transfers the tokens to the receiver address.
+     * @notice Transfers the tokens to the receiver address.
+     * @param _instaLoanVariables struct which includes list of token addresses and amounts.
+     * @param _receiver address to which tokens have to be transferred.
+     */
+    function safeTransfer(FlashloanVariables memory _instaLoanVariables, address _receiver) internal {
+        uint256 length_ = _instaLoanVariables._tokens.length;
+        require(length_ == _instaLoanVariables._amounts.length, 'Lengths of parameters not same');
+        for (uint256 i = 0; i < length_; i++) {
+            IERC20 token = IERC20(_instaLoanVariables._tokens[i]);
+            token.safeTransfer(_receiver, _instaLoanVariables._amounts[i]);
+        }
+    }
+}
+
+contract FlashloanHelpers is Structs { 
     /**
      * @dev Calculate fees for the respective amounts and fee in BPS passed.
      * @notice Calculate fees for the respective amounts and fee in BPS passed. 1 BPS == 0.01%.
@@ -95,16 +147,18 @@ contract HelpersCommon is VariablesCommon {
         return (_tokens, _amounts);
     }
 
+
     /**
-     * @dev Sort the tokens and amounts arrays according to token addresses.
-     * @notice Sort the tokens and amounts arrays according to token addresses.
-     * @param _token0 address of token0.
-     * @param _token1 address of token1.
+     * @dev Validates if the receiver sent the correct amounts of funds.
+     * @notice Validates if the receiver sent the correct amounts of funds.
+     * @param _instaLoanVariables struct which includes list of initial balances, final balances and fees for the respective tokens.
      */
-    function sortTokens(address _token0, address _token1) internal pure returns (address, address) {
-        if (_token1 < _token0) {
-            (_token0, _token1) = (_token1, _token0);
+    function validateFlashloan(FlashloanVariables memory _instaLoanVariables) internal pure {
+        for (uint256 i = 0; i < _instaLoanVariables._iniBals.length; i++) {
+            require(
+                _instaLoanVariables._iniBals[i] + _instaLoanVariables._instaFees[i] <= _instaLoanVariables._finBals[i],
+                'amount-paid-less'
+            );
         }
-        return (_token0, _token1);
     }
-}
+}