Merge pull request #67 from uprendis/feature/relock

Add multipenalties support

contracts/common/SafeMath.sol

@@ -0,0 +1,156 @@
+pragma solidity ^0.5.0;
+
+/**
+ * @dev Wrappers over Solidity's arithmetic operations with added overflow
+ * checks.
+ *
+ * Arithmetic operations in Solidity wrap on overflow. This can easily result
+ * in bugs, because programmers usually assume that an overflow raises an
+ * error, which is the standard behavior in high level programming languages.
+ * `SafeMath` restores this intuition by reverting the transaction when an
+ * operation overflows.
+ *
+ * Using this library instead of the unchecked operations eliminates an entire
+ * class of bugs, so it's recommended to use it always.
+ */
+library SafeMath {
+    /**
+     * @dev Returns the addition of two unsigned integers, reverting on
+     * overflow.
+     *
+     * Counterpart to Solidity's `+` operator.
+     *
+     * Requirements:
+     * - Addition cannot overflow.
+     */
+    function add(uint256 a, uint256 b) internal pure returns (uint256) {
+        uint256 c = a + b;
+        require(c >= a, "SafeMath: addition overflow");
+
+        return c;
+    }
+
+    /**
+     * @dev Returns the subtraction of two unsigned integers, reverting on
+     * overflow (when the result is negative).
+     *
+     * Counterpart to Solidity's `-` operator.
+     *
+     * Requirements:
+     * - Subtraction cannot overflow.
+     */
+    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
+        return sub(a, b, "SafeMath: subtraction overflow");
+    }
+
+    /**
+     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
+     * overflow (when the result is negative).
+     *
+     * Counterpart to Solidity's `-` operator.
+     *
+     * Requirements:
+     * - Subtraction cannot overflow.
+     *
+     * _Available since v2.4.0._
+     */
+    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
+        require(b <= a, errorMessage);
+        uint256 c = a - b;
+
+        return c;
+    }
+
+    /**
+     * @dev Returns the multiplication of two unsigned integers, reverting on
+     * overflow.
+     *
+     * Counterpart to Solidity's `*` operator.
+     *
+     * Requirements:
+     * - Multiplication cannot overflow.
+     */
+    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
+        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
+        // benefit is lost if 'b' is also tested.
+        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
+        if (a == 0) {
+            return 0;
+        }
+
+        uint256 c = a * b;
+        require(c / a == b, "SafeMath: multiplication overflow");
+
+        return c;
+    }
+
+    /**
+     * @dev Returns the integer division of two unsigned integers. Reverts on
+     * division by zero. The result is rounded towards zero.
+     *
+     * Counterpart to Solidity's `/` operator. Note: this function uses a
+     * `revert` opcode (which leaves remaining gas untouched) while Solidity
+     * uses an invalid opcode to revert (consuming all remaining gas).
+     *
+     * Requirements:
+     * - The divisor cannot be zero.
+     */
+    function div(uint256 a, uint256 b) internal pure returns (uint256) {
+        return div(a, b, "SafeMath: division by zero");
+    }
+
+    /**
+     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
+     * division by zero. The result is rounded towards zero.
+     *
+     * Counterpart to Solidity's `/` operator. Note: this function uses a
+     * `revert` opcode (which leaves remaining gas untouched) while Solidity
+     * uses an invalid opcode to revert (consuming all remaining gas).
+     *
+     * Requirements:
+     * - The divisor cannot be zero.
+     *
+     * _Available since v2.4.0._
+     */
+    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
+        // Solidity only automatically asserts when dividing by 0
+        require(b > 0, errorMessage);
+        uint256 c = a / b;
+        // assert(a == b * c + a % b); // There is no case in which this doesn't hold
+
+        return c;
+    }
+
+    /**
+     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
+     * Reverts when dividing by zero.
+     *
+     * Counterpart to Solidity's `%` operator. This function uses a `revert`
+     * opcode (which leaves remaining gas untouched) while Solidity uses an
+     * invalid opcode to revert (consuming all remaining gas).
+     *
+     * Requirements:
+     * - The divisor cannot be zero.
+     */
+    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
+        return mod(a, b, "SafeMath: modulo by zero");
+    }
+
+    /**
+     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
+     * Reverts with custom message when dividing by zero.
+     *
+     * Counterpart to Solidity's `%` operator. This function uses a `revert`
+     * opcode (which leaves remaining gas untouched) while Solidity uses an
+     * invalid opcode to revert (consuming all remaining gas).
+     *
+     * Requirements:
+     * - The divisor cannot be zero.
+     *
+     * _Available since v2.4.0._
+     */
+    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
+        require(b != 0, errorMessage);
+        return a % b;
+    }
+}

contracts/erc20/base/ERC20.sol

@@ -1,6 +1,6 @@
 pragma solidity ^0.5.0;
 
-import "@openzeppelin/contracts/math/SafeMath.sol";
+import "../../common/SafeMath.sol";
 import "./IERC20.sol";
 import "../../common/Initializable.sol";
 

contracts/sfc/ConstantsManager.sol

@@ -1,6 +1,6 @@
 pragma solidity ^0.5.0;
 
-import "@openzeppelin/contracts/math/SafeMath.sol";
+import "../common/SafeMath.sol";
 import "../ownership/Ownable.sol";
 import "../common/Decimal.sol";
 

contracts/sfc/NodeDriver.sol

@@ -1,6 +1,6 @@
 pragma solidity ^0.5.0;
 
-import "@openzeppelin/contracts/math/SafeMath.sol";
+import "../common/SafeMath.sol";
 import "../common/Initializable.sol";
 import "../ownership/Ownable.sol";
 import "./SFCI.sol";

contracts/sfc/SFC.sol

@@ -34,9 +34,6 @@ contract SFC is SFCBase, Version {
         _delegate(libAddress);
     }
 
-    event UpdatedBaseRewardPerSec(uint256 value);
-    event UpdatedOfflinePenaltyThreshold(uint256 blocksNum, uint256 period);
-
     /*
     Constructor
     */

contracts/sfc/SFCI.sol

@@ -1,6 +1,21 @@
 pragma solidity ^0.5.0;
 
 interface SFCI {
+    event CreatedValidator(uint256 indexed validatorID, address indexed auth, uint256 createdEpoch, uint256 createdTime);
+    event Delegated(address indexed delegator, uint256 indexed toValidatorID, uint256 amount);
+    event Undelegated(address indexed delegator, uint256 indexed toValidatorID, uint256 indexed wrID, uint256 amount);
+    event Withdrawn(address indexed delegator, uint256 indexed toValidatorID, uint256 indexed wrID, uint256 amount);
+    event ClaimedRewards(address indexed delegator, uint256 indexed toValidatorID, uint256 lockupExtraReward, uint256 lockupBaseReward, uint256 unlockedReward);
+    event RestakedRewards(address indexed delegator, uint256 indexed toValidatorID, uint256 lockupExtraReward, uint256 lockupBaseReward, uint256 unlockedReward);
+    event BurntFTM(uint256 amount);
+    event LockedUpStake(address indexed delegator, uint256 indexed validatorID, uint256 duration, uint256 amount);
+    event UnlockedStake(address indexed delegator, uint256 indexed validatorID, uint256 amount, uint256 penalty);
+    event UpdatedSlashingRefundRatio(uint256 indexed validatorID, uint256 refundRatio);
+    event RefundedSlashedLegacyDelegation(address indexed delegator, uint256 indexed validatorID, uint256 amount);
+
+    event DeactivatedValidator(uint256 indexed validatorID, uint256 deactivatedEpoch, uint256 deactivatedTime);
+    event ChangedValidatorStatus(uint256 indexed validatorID, uint256 status);
+
     function currentSealedEpoch() external view returns (uint256);
 
     function getEpochSnapshot(uint256) external view returns (uint256 endTime, uint256 epochFee, uint256 totalBaseRewardWeight, uint256 totalTxRewardWeight, uint256 _baseRewardPerSecond, uint256 totalStake, uint256 totalSupply);