Contract Name:
FriesDAOStakingPool
Contract Source Code:
File 1 of 1 : FriesDAOStakingPool
// SPDX-License-Identifier: MIT
pragma solidity 0.6.12;
/**
* @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, with an overflow flag.
*
* _Available since v3.4._
*/
function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
uint256 c = a + b;
if (c < a) return (false, 0);
return (true, c);
}
/**
* @dev Returns the substraction of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
if (b > a) return (false, 0);
return (true, a - b);
}
/**
* @dev Returns the multiplication of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryMul(uint256 a, uint256 b) internal pure returns (bool, 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 (true, 0);
uint256 c = a * b;
if (c / a != b) return (false, 0);
return (true, c);
}
/**
* @dev Returns the division of two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
if (b == 0) return (false, 0);
return (true, a / b);
}
/**
* @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
if (b == 0) return (false, 0);
return (true, a % b);
}
/**
* @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) {
require(b <= a, "SafeMath: subtraction overflow");
return a - b;
}
/**
* @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) {
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, reverting 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) {
require(b > 0, "SafeMath: division by zero");
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting 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) {
require(b > 0, "SafeMath: modulo by zero");
return a % b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {trySub}.
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
return a - b;
}
/**
* @dev Returns the integer division of two unsigned integers, reverting with custom message on
* division by zero. The result is rounded towards zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryDiv}.
*
* 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, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting with custom message when dividing by zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryMod}.
*
* 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, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
return a % b;
}
}
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
using SafeMath for uint256;
using Address for address;
function safeTransfer(IERC20 token, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
function safeApprove(IERC20 token, address spender, uint256 value) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
// solhint-disable-next-line max-line-length
require((value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).add(value);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
// the target address contains contract code and also asserts for success in the low-level call.
bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
if (returndata.length > 0) { // Return data is optional
// solhint-disable-next-line max-line-length
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
// solhint-disable-next-line no-inline-assembly
assembly { size := extcodesize(account) }
return size > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
// solhint-disable-next-line avoid-low-level-calls, avoid-call-value
(bool success, ) = recipient.call{ value: amount }("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain`call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.call{ value: value }(data);
return _verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
require(isContract(target), "Address: static call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.staticcall(data);
return _verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
require(isContract(target), "Address: delegate call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.delegatecall(data);
return _verifyCallResult(success, returndata, errorMessage);
}
function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
// solhint-disable-next-line no-inline-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// Note that this pool has no minter key of KCHUP (rewards).
// Instead, the governance will call KCHUP distributeReward method and send reward to this pool at the beginning.
contract FriesDAOStakingPool {
using SafeMath for uint256;
using SafeERC20 for IERC20;
// governance
address public operator;
// Info of each user.
struct UserInfo {
uint256 amount; // How many LP tokens the user has provided.
uint256 rewardDebt; // Reward debt. See explanation below.
}
// Info of each pool.
struct PoolInfo {
IERC20 token; // Address of LP token contract.
uint256 allocPoint; // How many allocation points assigned to this pool. Kchups to distribute in the pool.
uint256 lastRewardTime; // Last time that Kchups distribution occurred.
uint256 accKchupPerShare; // Accumulated Kchups per share, times 1e18. See below.
bool isStarted; // if lastRewardTime has passed
}
IERC20 public kchup;
// Info of each pool.
PoolInfo[] public poolInfo;
// Info of each user that stakes LP tokens.
mapping(uint256 => mapping(address => UserInfo)) public userInfo;
// Total allocation points. Must be the sum of all allocation points in all pools.
uint256 public totalAllocPoint = 0;
// The time when KCHUP mining starts.
uint256 public poolStartTime;
uint256[] public epochTotalRewards = [
49521739.29 ether,
45888889.29 ether,
42528503.04 ether,
39420145.76 ether,
36544915.27 ether,
33885327.07 ether,
31425207.99 ether,
29149597.84 ether,
27044658.44 ether,
25097589.51 ether,
23296550.74 ether,
21630589.88 ether,
20089576.09 ether,
18664138.33 ether,
17345608.40 ether,
16125968.22 ether,
14997801.05 ether,
13954246.41 ether,
12988958.38 ether,
12096066.95 ether,
11270142.37 ether,
10506162.14 ether,
9799480.43 ether,
9145799.84 ether,
8541145.30 ether,
7981839.85 ether,
7464482.31 ether,
6985926.58 ether,
6543262.53 ether,
6133798.29 ether,
5755043.86 ether,
5404696.02 ether,
5080624.27 ether,
4780857.89 ether,
4503574.00 ether,
4247086.39 ether
];
// Time when each epoch ends.
uint256[37] public epochEndTimes;
// Reward per second for each of 2 epochs (last item is equal to 0 - for sanity).
uint256[37] public epochKchupPerSecond;
event Deposit(address indexed user, uint256 indexed pid, uint256 amount);
event Withdraw(address indexed user, uint256 indexed pid, uint256 amount);
event EmergencyWithdraw(address indexed user, uint256 indexed pid, uint256 amount);
event RewardPaid(address indexed user, uint256 amount);
constructor(address _kchup, uint256 _poolStartTime) public {
require(block.timestamp < _poolStartTime, "late");
if (_kchup != address(0)) kchup = IERC20(_kchup);
poolStartTime = _poolStartTime;
epochEndTimes[0] = poolStartTime + 30 days;
epochEndTimes[1] = poolStartTime + 60 days;
epochEndTimes[2] = poolStartTime + 90 days;
epochEndTimes[3] = poolStartTime + 120 days;
epochEndTimes[4] = poolStartTime + 150 days;
epochEndTimes[5] = poolStartTime + 180 days;
epochEndTimes[6] = poolStartTime + 210 days;
epochEndTimes[7] = poolStartTime + 240 days;
epochEndTimes[8] = poolStartTime + 270 days;
epochEndTimes[9] = poolStartTime + 300 days;
epochEndTimes[10] = poolStartTime + 330 days;
epochEndTimes[11] = poolStartTime + 360 days;
epochEndTimes[12] = poolStartTime + 390 days;
epochEndTimes[13] = poolStartTime + 420 days;
epochEndTimes[14] = poolStartTime + 450 days;
epochEndTimes[15] = poolStartTime + 480 days;
epochEndTimes[16] = poolStartTime + 510 days;
epochEndTimes[17] = poolStartTime + 540 days;
epochEndTimes[18] = poolStartTime + 570 days;
epochEndTimes[19] = poolStartTime + 600 days;
epochEndTimes[20] = poolStartTime + 630 days;
epochEndTimes[21] = poolStartTime + 660 days;
epochEndTimes[22] = poolStartTime + 690 days;
epochEndTimes[23] = poolStartTime + 720 days;
epochEndTimes[24] = poolStartTime + 750 days;
epochEndTimes[25] = poolStartTime + 780 days;
epochEndTimes[26] = poolStartTime + 810 days;
epochEndTimes[27] = poolStartTime + 840 days;
epochEndTimes[28] = poolStartTime + 870 days;
epochEndTimes[29] = poolStartTime + 900 days;
epochEndTimes[30] = poolStartTime + 930 days;
epochEndTimes[31] = poolStartTime + 960 days;
epochEndTimes[32] = poolStartTime + 990 days;
epochEndTimes[33] = poolStartTime + 1020 days;
epochEndTimes[34] = poolStartTime + 1050 days;
epochEndTimes[35] = poolStartTime + 1080 days;
epochKchupPerSecond[0] = epochTotalRewards[0].div(30 days);
epochKchupPerSecond[1] = epochTotalRewards[1].div(30 days);
epochKchupPerSecond[2] = epochTotalRewards[2].div(30 days);
epochKchupPerSecond[3] = epochTotalRewards[3].div(30 days);
epochKchupPerSecond[4] = epochTotalRewards[4].div(30 days);
epochKchupPerSecond[5] = epochTotalRewards[5].div(30 days);
epochKchupPerSecond[6] = epochTotalRewards[6].div(30 days);
epochKchupPerSecond[7] = epochTotalRewards[7].div(30 days);
epochKchupPerSecond[8] = epochTotalRewards[8].div(30 days);
epochKchupPerSecond[9] = epochTotalRewards[9].div(30 days);
epochKchupPerSecond[10] = epochTotalRewards[10].div(30 days);
epochKchupPerSecond[11] = epochTotalRewards[11].div(30 days);
epochKchupPerSecond[12] = epochTotalRewards[12].div(30 days);
epochKchupPerSecond[13] = epochTotalRewards[13].div(30 days);
epochKchupPerSecond[14] = epochTotalRewards[14].div(30 days);
epochKchupPerSecond[15] = epochTotalRewards[15].div(30 days);
epochKchupPerSecond[16] = epochTotalRewards[16].div(30 days);
epochKchupPerSecond[17] = epochTotalRewards[17].div(30 days);
epochKchupPerSecond[18] = epochTotalRewards[18].div(30 days);
epochKchupPerSecond[19] = epochTotalRewards[19].div(30 days);
epochKchupPerSecond[20] = epochTotalRewards[20].div(30 days);
epochKchupPerSecond[21] = epochTotalRewards[21].div(30 days);
epochKchupPerSecond[22] = epochTotalRewards[22].div(30 days);
epochKchupPerSecond[23] = epochTotalRewards[23].div(30 days);
epochKchupPerSecond[24] = epochTotalRewards[24].div(30 days);
epochKchupPerSecond[25] = epochTotalRewards[25].div(30 days);
epochKchupPerSecond[26] = epochTotalRewards[26].div(30 days);
epochKchupPerSecond[27] = epochTotalRewards[27].div(30 days);
epochKchupPerSecond[28] = epochTotalRewards[28].div(30 days);
epochKchupPerSecond[29] = epochTotalRewards[29].div(30 days);
epochKchupPerSecond[30] = epochTotalRewards[30].div(30 days);
epochKchupPerSecond[31] = epochTotalRewards[31].div(30 days);
epochKchupPerSecond[32] = epochTotalRewards[32].div(30 days);
epochKchupPerSecond[33] = epochTotalRewards[33].div(30 days);
epochKchupPerSecond[34] = epochTotalRewards[34].div(30 days);
epochKchupPerSecond[35] = epochTotalRewards[35].div(30 days);
epochKchupPerSecond[36] = 0;
operator = msg.sender;
}
modifier onlyOperator() {
require(operator == msg.sender, "FriesDAOStakingPool: caller is not the operator");
_;
}
function checkPoolDuplicate(IERC20 _token) internal view {
uint256 length = poolInfo.length;
for (uint256 pid = 0; pid < length; ++pid) {
require(poolInfo[pid].token != _token, "FriesDAOStakingPool: existing pool?");
}
}
// Add a new token to the pool. Can only be called by the owner.
function add(
uint256 _allocPoint,
IERC20 _token,
bool _withUpdate,
uint256 _lastRewardTime
) public onlyOperator {
checkPoolDuplicate(_token);
if (_withUpdate) {
massUpdatePools();
}
if (block.timestamp < poolStartTime) {
// chef is sleeping
if (_lastRewardTime == 0) {
_lastRewardTime = poolStartTime;
} else {
if (_lastRewardTime < poolStartTime) {
_lastRewardTime = poolStartTime;
}
}
} else {
// chef is cooking
if (_lastRewardTime == 0 || _lastRewardTime < block.timestamp) {
_lastRewardTime = block.timestamp;
}
}
bool _isStarted = (_lastRewardTime <= poolStartTime) || (_lastRewardTime <= block.timestamp);
poolInfo.push(PoolInfo({token: _token, allocPoint: _allocPoint, lastRewardTime: _lastRewardTime, accKchupPerShare: 0, isStarted: _isStarted}));
if (_isStarted) {
totalAllocPoint = totalAllocPoint.add(_allocPoint);
}
}
// Update the given pool's KCHUP allocation point. Can only be called by the owner.
function set(uint256 _pid, uint256 _allocPoint) public onlyOperator {
massUpdatePools();
PoolInfo storage pool = poolInfo[_pid];
if (pool.isStarted) {
totalAllocPoint = totalAllocPoint.sub(pool.allocPoint).add(_allocPoint);
}
pool.allocPoint = _allocPoint;
}
// Return accumulate rewards over the given _fromTime to _toTime.
function getGeneratedReward(uint256 _fromTime, uint256 _toTime) public view returns (uint256) {
for (uint8 epochId = 36; epochId >= 1; --epochId) {
if (_toTime >= epochEndTimes[epochId - 1]) {
if (_fromTime >= epochEndTimes[epochId - 1]) {
return _toTime.sub(_fromTime).mul(epochKchupPerSecond[epochId]);
}
uint256 _generatedReward = _toTime.sub(epochEndTimes[epochId - 1]).mul(epochKchupPerSecond[epochId]);
if (epochId == 1) {
return _generatedReward.add(epochEndTimes[0].sub(_fromTime).mul(epochKchupPerSecond[0]));
}
for (epochId = epochId - 1; epochId >= 1; --epochId) {
if (_fromTime >= epochEndTimes[epochId - 1]) {
return _generatedReward.add(epochEndTimes[epochId].sub(_fromTime).mul(epochKchupPerSecond[epochId]));
}
_generatedReward = _generatedReward.add(epochEndTimes[epochId].sub(epochEndTimes[epochId - 1]).mul(epochKchupPerSecond[epochId]));
}
return _generatedReward.add(epochEndTimes[0].sub(_fromTime).mul(epochKchupPerSecond[0]));
}
}
return _toTime.sub(_fromTime).mul(epochKchupPerSecond[0]);
}
// View function to see pending KCHUPs on frontend.
function pendingKCHUP(uint256 _pid, address _user) external view returns (uint256) {
PoolInfo storage pool = poolInfo[_pid];
UserInfo storage user = userInfo[_pid][_user];
uint256 accKchupPerShare = pool.accKchupPerShare;
uint256 tokenSupply = pool.token.balanceOf(address(this));
if (block.timestamp > pool.lastRewardTime && tokenSupply != 0) {
uint256 _generatedReward = getGeneratedReward(pool.lastRewardTime, block.timestamp);
uint256 _kchupReward = _generatedReward.mul(pool.allocPoint).div(totalAllocPoint);
accKchupPerShare = accKchupPerShare.add(_kchupReward.mul(1e18).div(tokenSupply));
}
return user.amount.mul(accKchupPerShare).div(1e18).sub(user.rewardDebt);
}
// Update reward variables for all pools. Expensive!
function massUpdatePools() public {
uint256 length = poolInfo.length;
for (uint256 pid = 0; pid < length; ++pid) {
updatePool(pid);
}
}
// Update reward variables of the given pool to be up-to-date.
function updatePool(uint256 _pid) public {
PoolInfo storage pool = poolInfo[_pid];
if (block.timestamp <= pool.lastRewardTime) {
return;
}
uint256 tokenSupply = pool.token.balanceOf(address(this));
if (tokenSupply == 0) {
pool.lastRewardTime = block.timestamp;
return;
}
if (!pool.isStarted) {
pool.isStarted = true;
totalAllocPoint = totalAllocPoint.add(pool.allocPoint);
}
if (totalAllocPoint > 0) {
uint256 _generatedReward = getGeneratedReward(pool.lastRewardTime, block.timestamp);
uint256 _kchupReward = _generatedReward.mul(pool.allocPoint).div(totalAllocPoint);
pool.accKchupPerShare = pool.accKchupPerShare.add(_kchupReward.mul(1e18).div(tokenSupply));
}
pool.lastRewardTime = block.timestamp;
}
// Deposit LP tokens.
function deposit(uint256 _pid, uint256 _amount) public {
address _sender = msg.sender;
PoolInfo storage pool = poolInfo[_pid];
UserInfo storage user = userInfo[_pid][_sender];
updatePool(_pid);
if (user.amount > 0) {
uint256 _pending = user.amount.mul(pool.accKchupPerShare).div(1e18).sub(user.rewardDebt);
if (_pending > 0) {
safeKchupTransfer(_sender, _pending);
emit RewardPaid(_sender, _pending);
}
}
if (_amount > 0) {
pool.token.safeTransferFrom(_sender, address(this), _amount);
user.amount = user.amount.add(_amount);
}
user.rewardDebt = user.amount.mul(pool.accKchupPerShare).div(1e18);
emit Deposit(_sender, _pid, _amount);
}
// Withdraw LP tokens.
function withdraw(uint256 _pid, uint256 _amount) public {
address _sender = msg.sender;
PoolInfo storage pool = poolInfo[_pid];
UserInfo storage user = userInfo[_pid][_sender];
require(user.amount >= _amount, "withdraw: not good");
updatePool(_pid);
uint256 _pending = user.amount.mul(pool.accKchupPerShare).div(1e18).sub(user.rewardDebt);
if (_pending > 0) {
safeKchupTransfer(_sender, _pending);
emit RewardPaid(_sender, _pending);
}
if (_amount > 0) {
user.amount = user.amount.sub(_amount);
pool.token.safeTransfer(_sender, _amount);
}
user.rewardDebt = user.amount.mul(pool.accKchupPerShare).div(1e18);
emit Withdraw(_sender, _pid, _amount);
}
// Withdraw without caring about rewards. EMERGENCY ONLY.
function emergencyWithdraw(uint256 _pid) public {
PoolInfo storage pool = poolInfo[_pid];
UserInfo storage user = userInfo[_pid][msg.sender];
uint256 _amount = user.amount;
user.amount = 0;
user.rewardDebt = 0;
pool.token.safeTransfer(msg.sender, _amount);
emit EmergencyWithdraw(msg.sender, _pid, _amount);
}
// Safe kchup transfer function, just in case if rounding error causes pool to not have enough Kchups.
function safeKchupTransfer(address _to, uint256 _amount) internal {
uint256 _kchupBal = kchup.balanceOf(address(this));
if (_kchupBal > 0) {
if (_amount > _kchupBal) {
kchup.safeTransfer(_to, _kchupBal);
} else {
kchup.safeTransfer(_to, _amount);
}
}
}
function setOperator(address _operator) external onlyOperator {
operator = _operator;
}
function governanceRecoverUnsupported(
IERC20 _token,
uint256 amount,
address to
) external onlyOperator {
if (block.timestamp < epochEndTimes[1] + 30 days) {
// do not allow to drain token if less than 30 days after farming
require(_token != kchup, "!kchup");
uint256 length = poolInfo.length;
for (uint256 pid = 0; pid < length; ++pid) {
PoolInfo storage pool = poolInfo[pid];
require(_token != pool.token, "!pool.token");
}
}
_token.safeTransfer(to, amount);
}
}