Contract Source Code:
File 1 of 1 : O3Staking
// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.6.12;
// Part: Address
/**
* @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);
}
}
}
}
// Part: Context
/*
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with GSN meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address payable) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
// Part: IERC20
/**
* @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);
}
// Part: ReentrancyGuard
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
abstract contract ReentrancyGuard {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
constructor () internal {
_status = _NOT_ENTERED;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and make it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
// On the first call to nonReentrant, _notEntered will be true
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
_;
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
}
// Part: SafeMath
/**
* @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;
}
}
// Part: IO3
interface IO3 is IERC20 {
function getUnlockFactor(address token) external view returns (uint256);
function getUnlockBlockGap(address token) external view returns (uint256);
function totalUnlocked() external view returns (uint256);
function unlockedOf(address account) external view returns (uint256);
function lockedOf(address account) external view returns (uint256);
function getStaked(address token) external view returns (uint256);
function getUnlockSpeed(address staker, address token) external view returns (uint256);
function claimableUnlocked(address token) external view returns (uint256);
function setUnlockFactor(address token, uint256 _factor) external;
function setUnlockBlockGap(address token, uint256 _blockGap) external;
function stake(address token, uint256 amount) external returns (bool);
function unstake(address token, uint256 amount) external returns (bool);
function claimUnlocked(address token) external returns (bool);
function setAuthorizedMintCaller(address caller) external;
function removeAuthorizedMintCaller(address caller) external;
function mintUnlockedToken(address to, uint256 amount) external;
function mintLockedToken(address to, uint256 amount) external;
}
// Part: Ownable
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor () internal {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
// Part: SafeERC20
/**
* @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");
}
}
}
// File: O3Staking.sol
contract O3Staking is Context, Ownable, ReentrancyGuard {
using SafeMath for uint;
using SafeMath for uint256;
using SafeERC20 for IERC20;
struct StakingRecord {
address staker;
uint blockIndex;
uint staked;
uint totalProfit;
}
event LOG_STAKE (
address indexed staker,
uint stakeAmount
);
event LOG_UNSTAKE (
address indexed staker,
uint withdrawAmount
);
event LOG_CLAIM_PROFIT (
address indexed staker,
uint profit
);
event LOG_CALL (
bytes4 indexed sig,
address indexed caller,
bytes data
) anonymous;
modifier _logs_() {
emit LOG_CALL(msg.sig, _msgSender(), _msgData());
_;
}
address public StakingToken;
address public O3Token;
uint public startStakingBlockIndex;
uint public startUnstakeBlockIndex;
uint public startClaimBlockIndex;
uint public totalStaked;
mapping(address => StakingRecord) private _stakingRecords;
mapping(uint => uint) private _unitProfitAccumu;
uint private _unitProfit; // Latest unit profit.
uint private _upBlockIndex; // The block index `_unitProfit` refreshed.
uint private _sharePerBlock;
bool private _stakingPaused;
bool private _withdarawPaused;
bool private _claimProfitPaused;
uint public constant ONE = 10**18;
constructor(
address _stakingToken,
address _o3Token,
uint _startStakingBlockIndex,
uint _startUnstakeBlockIndex,
uint _startClaimBlockIndex
) public {
require(_stakingToken != address(0), "O3Staking: ZERO_STAKING_ADDRESS");
require(_o3Token != address(0), "O3Staking: ZERO_O3TOKEN_ADDRESS");
require(_startClaimBlockIndex >= _startStakingBlockIndex, "O3Staking: INVALID_START_CLAIM_BLOCK_INDEX");
StakingToken = _stakingToken;
O3Token = _o3Token;
startStakingBlockIndex = _startStakingBlockIndex;
startUnstakeBlockIndex = _startUnstakeBlockIndex;
startClaimBlockIndex = _startClaimBlockIndex;
}
function getTotalProfit(address staker) external view returns (uint) {
if (block.number <= startStakingBlockIndex) {
return 0;
}
uint currentProfitAccumu = _unitProfitAccumu[block.number];
if (_upBlockIndex < block.number) {
uint unitProfitIncrease = _unitProfit.mul(block.number.sub(_upBlockIndex));
currentProfitAccumu = _unitProfitAccumu[_upBlockIndex].add(unitProfitIncrease);
}
StakingRecord storage rec = _stakingRecords[staker];
uint preUnitProfit = _unitProfitAccumu[rec.blockIndex];
uint currentProfit = (currentProfitAccumu.sub(preUnitProfit)).mul(rec.staked).div(ONE);
return rec.totalProfit.add(currentProfit);
}
function getStakingAmount(address staker) external view returns (uint) {
StakingRecord storage rec = _stakingRecords[staker];
return rec.staked;
}
function getSharePerBlock() external view returns (uint) {
return _sharePerBlock;
}
function setStakingToke(address _token) external onlyOwner _logs_ {
StakingToken = _token;
}
function setSharePerBlock(uint sharePerBlock) external onlyOwner _logs_ {
_sharePerBlock = sharePerBlock;
_updateUnitProfitState();
}
function setStartUnstakeBlockIndex(uint _startUnstakeBlockIndex) external onlyOwner _logs_ {
startUnstakeBlockIndex = _startUnstakeBlockIndex;
}
function setStartClaimBlockIndex(uint _startClaimBlockIndex) external onlyOwner _logs_ {
startClaimBlockIndex = _startClaimBlockIndex;
}
function stake(uint amount) external nonReentrant _logs_ {
require(!_stakingPaused, "O3Staking: STAKING_PAUSED");
require(amount > 0, "O3Staking: INVALID_STAKING_AMOUNT");
totalStaked = amount.add(totalStaked);
_updateUnitProfitState();
StakingRecord storage rec = _stakingRecords[_msgSender()];
uint userTotalProfit = _settleCurrentUserProfit(_msgSender());
_updateUserStakingRecord(_msgSender(), rec.staked.add(amount), userTotalProfit);
emit LOG_STAKE(_msgSender(), amount);
_pullToken(StakingToken, _msgSender(), amount);
}
function unstake(uint amount) external nonReentrant _logs_ {
require(!_withdarawPaused, "O3Staking: UNSTAKE_PAUSED");
require(block.number >= startUnstakeBlockIndex, "O3Staking: UNSTAKE_NOT_STARTED");
StakingRecord storage rec = _stakingRecords[_msgSender()];
require(amount > 0, "O3Staking: ZERO_UNSTAKE_AMOUNT");
require(amount <= rec.staked, "O3Staking: UNSTAKE_AMOUNT_EXCEEDED");
totalStaked = totalStaked.sub(amount);
_updateUnitProfitState();
uint userTotalProfit = _settleCurrentUserProfit(_msgSender());
_updateUserStakingRecord(_msgSender(), rec.staked.sub(amount), userTotalProfit);
emit LOG_UNSTAKE(_msgSender(), amount);
_pushToken(StakingToken, _msgSender(), amount);
}
function claimProfit() external nonReentrant _logs_ {
require(!_claimProfitPaused, "O3Staking: CLAIM_PROFIT_PAUSED");
require(block.number >= startClaimBlockIndex, "O3Staking: CLAIM_NOT_STARTED");
uint totalProfit = _getTotalProfit(_msgSender());
require(totalProfit > 0, "O3Staking: ZERO_PROFIT");
StakingRecord storage rec = _stakingRecords[_msgSender()];
_updateUserStakingRecord(_msgSender(), rec.staked, 0);
emit LOG_CLAIM_PROFIT(_msgSender(), totalProfit);
_pushShareToken(_msgSender(), totalProfit);
}
function _getTotalProfit(address staker) internal returns (uint) {
_updateUnitProfitState();
uint totalProfit = _settleCurrentUserProfit(staker);
return totalProfit;
}
function _updateUserStakingRecord(address staker, uint staked, uint totalProfit) internal {
_stakingRecords[staker].staked = staked;
_stakingRecords[staker].totalProfit = totalProfit;
_stakingRecords[staker].blockIndex = block.number;
// Any action before `startStakingBlockIndex` is treated as acted in block `startStakingBlockIndex`.
if (block.number < startStakingBlockIndex) {
_stakingRecords[staker].blockIndex = startStakingBlockIndex;
}
}
function _settleCurrentUserProfit(address staker) internal view returns (uint) {
if (block.number <= startStakingBlockIndex) {
return 0;
}
StakingRecord storage rec = _stakingRecords[staker];
uint preUnitProfit = _unitProfitAccumu[rec.blockIndex];
uint currUnitProfit = _unitProfitAccumu[block.number];
uint currentProfit = (currUnitProfit.sub(preUnitProfit)).mul(rec.staked).div(ONE);
return rec.totalProfit.add(currentProfit);
}
function _updateUnitProfitState() internal {
uint currentBlockIndex = block.number;
if (_upBlockIndex >= currentBlockIndex) {
_updateUnitProfit();
return;
}
// Accumulate unit profit.
uint unitStakeProfitIncrease = _unitProfit.mul(currentBlockIndex.sub(_upBlockIndex));
_unitProfitAccumu[currentBlockIndex] = unitStakeProfitIncrease.add(_unitProfitAccumu[_upBlockIndex]);
_upBlockIndex = block.number;
if (currentBlockIndex <= startStakingBlockIndex) {
_unitProfitAccumu[startStakingBlockIndex] = _unitProfitAccumu[currentBlockIndex];
_upBlockIndex = startStakingBlockIndex;
}
_updateUnitProfit();
}
function _updateUnitProfit() internal {
if (totalStaked > 0) {
_unitProfit = _sharePerBlock.mul(ONE).div(totalStaked);
}
}
function pauseStaking() external onlyOwner _logs_ {
_stakingPaused = true;
}
function unpauseStaking() external onlyOwner _logs_ {
_stakingPaused = false;
}
function pauseUnstake() external onlyOwner _logs_ {
_withdarawPaused = true;
}
function unpauseUnstake() external onlyOwner _logs_ {
_withdarawPaused = false;
}
function pauseClaimProfit() external onlyOwner _logs_ {
_claimProfitPaused = true;
}
function unpauseClaimProfit() external onlyOwner _logs_ {
_claimProfitPaused = false;
}
function collect(address token, address to) external nonReentrant onlyOwner _logs_ {
require(token != StakingToken, "O3Staking: COLLECT_NOT_ALLOWED");
uint balance = IERC20(token).balanceOf(address(this));
_pushToken(token, to, balance);
}
function _pushToken(address token, address to, uint amount) internal {
SafeERC20.safeTransfer(IERC20(token), to, amount);
}
function _pushShareToken(address to, uint amount) internal {
IO3(O3Token).mintLockedToken(to, amount);
}
function _pullToken(address token, address from, uint amount) internal {
SafeERC20.safeTransferFrom(IERC20(token), from, address(this), amount);
}
}