Contract Name:
RewardsDistributor
Contract Source Code:
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
* https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
*
* Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
* presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
* need to send a transaction, and thus is not required to hold Ether at all.
*/
interface IERC20Permit {
/**
* @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
* given ``owner``'s signed approval.
*
* IMPORTANT: The same issues {IERC20-approve} has related to transaction
* ordering also apply here.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `deadline` must be a timestamp in the future.
* - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
* over the EIP712-formatted function arguments.
* - the signature must use ``owner``'s current nonce (see {nonces}).
*
* For more information on the signature format, see the
* https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
* section].
*/
function permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) external;
/**
* @dev Returns the current nonce for `owner`. This value must be
* included whenever a signature is generated for {permit}.
*
* Every successful call to {permit} increases ``owner``'s nonce by one. This
* prevents a signature from being used multiple times.
*/
function nonces(address owner) external view returns (uint256);
/**
* @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
*/
// solhint-disable-next-line func-name-mixedcase
function DOMAIN_SEPARATOR() external view returns (bytes32);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @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);
/**
* @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 `to`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address to, 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 `from` to `to` 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 from,
address to,
uint256 amount
) external returns (bool);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)
pragma solidity ^0.8.0;
import "../IERC20.sol";
import "../extensions/draft-IERC20Permit.sol";
import "../../../utils/Address.sol";
/**
* @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 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'
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) + value;
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
unchecked {
uint256 oldAllowance = token.allowance(address(this), spender);
require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
uint256 newAllowance = oldAllowance - value;
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
}
function safePermit(
IERC20Permit token,
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) internal {
uint256 nonceBefore = token.nonces(owner);
token.permit(owner, spender, value, deadline, v, r, s);
uint256 nonceAfter = token.nonces(owner);
require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
}
/**
* @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
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)
pragma solidity ^0.8.1;
/**
* @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
* ====
*
* [IMPORTANT]
* ====
* You shouldn't rely on `isContract` to protect against flash loan attacks!
*
* Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
* like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
* constructor.
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize/address.code.length, which returns 0
// for contracts in construction, since the code is only stored at the end
// of the constructor execution.
return account.code.length > 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");
(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 functionCallWithValue(target, data, 0, "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");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResultFromTarget(target, 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) {
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResultFromTarget(target, 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) {
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResultFromTarget(target, success, returndata, errorMessage);
}
/**
* @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
* the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
*
* _Available since v4.8._
*/
function verifyCallResultFromTarget(
address target,
bool success,
bytes memory returndata,
string memory errorMessage
) internal view returns (bytes memory) {
if (success) {
if (returndata.length == 0) {
// only check isContract if the call was successful and the return data is empty
// otherwise we already know that it was a contract
require(isContract(target), "Address: call to non-contract");
}
return returndata;
} else {
_revert(returndata, errorMessage);
}
}
/**
* @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason or using the provided one.
*
* _Available since v4.3._
*/
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
_revert(returndata, errorMessage);
}
}
function _revert(bytes memory returndata, string memory errorMessage) private pure {
// 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
/// @solidity memory-safe-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;
interface IRewardsDistributor {
function checkpoint_token() external;
function voting_escrow() external view returns(address);
function checkpoint_total_supply() external;
function claimable(uint _tokenId) external view returns (uint);
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;
interface IVotingEscrow {
struct Point {
int128 bias;
int128 slope; // # -dweight / dt
uint256 ts;
uint256 blk; // block
}
struct LockedBalance {
int128 amount;
uint start;
uint end;
}
function create_lock_for(uint _value, uint _lock_duration, address _to) external returns (uint);
function locked(uint id) external view returns(LockedBalance memory);
function tokenOfOwnerByIndex(address _owner, uint _tokenIndex) external view returns (uint);
function token() external view returns (address);
function team() external returns (address);
function epoch() external view returns (uint);
function point_history(uint loc) external view returns (Point memory);
function user_point_history(uint tokenId, uint loc) external view returns (Point memory);
function user_point_epoch(uint tokenId) external view returns (uint);
function ownerOf(uint) external view returns (address);
function isApprovedOrOwner(address, uint) external view returns (bool);
function transferFrom(address, address, uint) external;
function voted(uint) external view returns (bool);
function attachments(uint) external view returns (uint);
function voting(uint tokenId) external;
function abstain(uint tokenId) external;
function attach(uint tokenId) external;
function detach(uint tokenId) external;
function checkpoint() external;
function deposit_for(uint tokenId, uint value) external;
function balanceOfAtNFT(uint _tokenId, uint _block) external view returns (uint);
function balanceOfNFT(uint _id) external view returns (uint);
function balanceOf(address _owner) external view returns (uint);
function totalSupply() external view returns (uint);
function supply() external view returns (uint);
function decimals() external view returns(uint8);
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;
library Constants {
uint256 internal constant EPOCH_LENGTH = 7 days;
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;
library Math {
function max(uint a, uint b) internal pure returns (uint) {
return a >= b ? a : b;
}
function min(uint a, uint b) internal pure returns (uint) {
return a < b ? a : b;
}
function sqrt(uint y) internal pure returns (uint z) {
if (y > 3) {
z = y;
uint x = y / 2 + 1;
while (x < z) {
z = x;
x = (y / x + x) / 2;
}
} else if (y != 0) {
z = 1;
}
}
function cbrt(uint256 n) internal pure returns (uint256) { unchecked {
uint256 x = 0;
for (uint256 y = 1 << 255; y > 0; y >>= 3) {
x <<= 1;
uint256 z = 3 * x * (x + 1) + 1;
if (n / y >= z) {
n -= y * z;
x += 1;
}
}
return x;
}}
}
// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.13;
import './libraries/Math.sol';
import {Constants} from "./libraries/Constants.sol";
import './interfaces/IRewardsDistributor.sol';
import './interfaces/IVotingEscrow.sol';
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
/*
@title Curve Fee Distribution modified for ve(3,3) emissions
@author Curve Finance, andrecronje
@license MIT
*/
contract RewardsDistributor is IRewardsDistributor {
using SafeERC20 for IERC20;
event CheckpointToken(
uint time,
uint tokens
);
event Claimed(
uint tokenId,
uint amount,
uint claim_epoch,
uint max_epoch
);
uint public start_time;
uint public time_cursor;
mapping(uint => uint) public time_cursor_of;
mapping(uint => uint) public user_epoch_of;
uint public last_token_time;
uint[1000000000000000] public tokens_per_week;
uint public token_last_balance;
uint[1000000000000000] public ve_supply;
address public owner;
address public voting_escrow;
address public token;
address public depositor;
constructor(address _voting_escrow) {
uint _t = block.timestamp / Constants.EPOCH_LENGTH * Constants.EPOCH_LENGTH;
start_time = _t;
last_token_time = _t;
time_cursor = _t;
address _token = IVotingEscrow(_voting_escrow).token();
token = _token;
voting_escrow = _voting_escrow;
depositor = msg.sender; //MinterUpgradeable
owner = msg.sender;
require(IERC20(_token).approve(_voting_escrow, type(uint).max));
}
function timestamp() external view returns (uint) {
return block.timestamp / Constants.EPOCH_LENGTH * Constants.EPOCH_LENGTH;
}
function _checkpoint_token() internal {
uint token_balance = IERC20(token).balanceOf(address(this));
uint to_distribute = token_balance - token_last_balance;
token_last_balance = token_balance;
uint t = last_token_time;
uint since_last = block.timestamp - t;
last_token_time = block.timestamp;
uint this_week = t / Constants.EPOCH_LENGTH * Constants.EPOCH_LENGTH;
uint next_week = 0;
for (uint i = 0; i < 20; i++) {
next_week = this_week + Constants.EPOCH_LENGTH;
if (block.timestamp < next_week) {
if (since_last == 0 && block.timestamp == t) {
tokens_per_week[this_week] += to_distribute;
} else {
tokens_per_week[this_week] += to_distribute * (block.timestamp - t) / since_last;
}
break;
} else {
if (since_last == 0 && next_week == t) {
tokens_per_week[this_week] += to_distribute;
} else {
tokens_per_week[this_week] += to_distribute * (next_week - t) / since_last;
}
}
t = next_week;
this_week = next_week;
}
emit CheckpointToken(block.timestamp, to_distribute);
}
function checkpoint_token() external {
assert(msg.sender == depositor);
_checkpoint_token();
}
function _find_timestamp_epoch(address ve, uint _timestamp) internal view returns (uint) {
uint _min = 0;
uint _max = IVotingEscrow(ve).epoch();
for (uint i = 0; i < 128; i++) {
if (_min >= _max) break;
uint _mid = (_min + _max + 2) / 2;
IVotingEscrow.Point memory pt = IVotingEscrow(ve).point_history(_mid);
if (pt.ts <= _timestamp) {
_min = _mid;
} else {
_max = _mid - 1;
}
}
return _min;
}
function _find_timestamp_user_epoch(address ve, uint tokenId, uint _timestamp, uint max_user_epoch) internal view returns (uint) {
uint _min = 0;
uint _max = max_user_epoch;
for (uint i = 0; i < 128; i++) {
if (_min >= _max) break;
uint _mid = (_min + _max + 2) / 2;
IVotingEscrow.Point memory pt = IVotingEscrow(ve).user_point_history(tokenId, _mid);
if (pt.ts <= _timestamp) {
_min = _mid;
} else {
_max = _mid -1;
}
}
return _min;
}
function ve_for_at(uint _tokenId, uint _timestamp) external view returns (uint) {
address ve = voting_escrow;
uint max_user_epoch = IVotingEscrow(ve).user_point_epoch(_tokenId);
uint epoch = _find_timestamp_user_epoch(ve, _tokenId, _timestamp, max_user_epoch);
IVotingEscrow.Point memory pt = IVotingEscrow(ve).user_point_history(_tokenId, epoch);
return Math.max(uint(int256(pt.bias - pt.slope * (int128(int256(_timestamp - pt.ts))))), 0);
}
function _checkpoint_total_supply() internal {
address ve = voting_escrow;
uint t = time_cursor;
uint rounded_timestamp = block.timestamp / Constants.EPOCH_LENGTH * Constants.EPOCH_LENGTH;
IVotingEscrow(ve).checkpoint();
for (uint i = 0; i < 20; i++) {
if (t > rounded_timestamp) {
break;
} else {
uint epoch = _find_timestamp_epoch(ve, t);
IVotingEscrow.Point memory pt = IVotingEscrow(ve).point_history(epoch);
int128 dt = 0;
if (t > pt.ts) {
dt = int128(int256(t - pt.ts));
}
ve_supply[t] = Math.max(uint(int256(pt.bias - pt.slope * dt)), 0);
}
t += Constants.EPOCH_LENGTH;
}
time_cursor = t;
}
function checkpoint_total_supply() external {
_checkpoint_total_supply();
}
function _claim(uint _tokenId, address ve, uint _last_token_time) internal returns (uint) {
uint user_epoch = 0;
uint to_distribute = 0;
uint max_user_epoch = IVotingEscrow(ve).user_point_epoch(_tokenId);
uint _start_time = start_time;
if (max_user_epoch == 0) return 0;
uint week_cursor = time_cursor_of[_tokenId];
if (week_cursor == 0) {
user_epoch = _find_timestamp_user_epoch(ve, _tokenId, _start_time, max_user_epoch);
} else {
user_epoch = user_epoch_of[_tokenId];
}
if (user_epoch == 0) user_epoch = 1;
IVotingEscrow.Point memory user_point = IVotingEscrow(ve).user_point_history(_tokenId, user_epoch);
if (week_cursor == 0) week_cursor = (user_point.ts + Constants.EPOCH_LENGTH - 1) / Constants.EPOCH_LENGTH * Constants.EPOCH_LENGTH;
if (week_cursor >= last_token_time) return 0;
if (week_cursor < _start_time) week_cursor = _start_time;
IVotingEscrow.Point memory old_user_point;
for (uint i = 0; i < 50; i++) {
if (week_cursor >= _last_token_time) break;
if (week_cursor >= user_point.ts && user_epoch <= max_user_epoch) {
user_epoch += 1;
old_user_point = user_point;
if (user_epoch > max_user_epoch) {
user_point = IVotingEscrow.Point(0,0,0,0);
} else {
user_point = IVotingEscrow(ve).user_point_history(_tokenId, user_epoch);
}
} else {
int128 dt = int128(int256(week_cursor - old_user_point.ts));
uint balance_of = (old_user_point.bias - dt * old_user_point.slope) < 0 ? 0 : uint(int256(old_user_point.bias - dt * old_user_point.slope));
if (balance_of == 0 && user_epoch > max_user_epoch) break;
if (balance_of != 0) {
to_distribute += balance_of * tokens_per_week[week_cursor] / ve_supply[week_cursor];
}
week_cursor += Constants.EPOCH_LENGTH;
}
}
user_epoch = Math.min(max_user_epoch, user_epoch - 1);
user_epoch_of[_tokenId] = user_epoch;
time_cursor_of[_tokenId] = week_cursor;
emit Claimed(_tokenId, to_distribute, user_epoch, max_user_epoch);
return to_distribute;
}
function _claimable(uint _tokenId, address ve, uint _last_token_time) internal view returns (uint) {
uint user_epoch = 0;
uint to_distribute = 0;
uint max_user_epoch = IVotingEscrow(ve).user_point_epoch(_tokenId);
uint _start_time = start_time;
if (max_user_epoch == 0) return 0;
uint week_cursor = time_cursor_of[_tokenId];
if (week_cursor == 0) {
user_epoch = _find_timestamp_user_epoch(ve, _tokenId, _start_time, max_user_epoch);
} else {
user_epoch = user_epoch_of[_tokenId];
}
if (user_epoch == 0) user_epoch = 1;
IVotingEscrow.Point memory user_point = IVotingEscrow(ve).user_point_history(_tokenId, user_epoch);
if (week_cursor == 0) week_cursor = (user_point.ts + Constants.EPOCH_LENGTH - 1) / Constants.EPOCH_LENGTH * Constants.EPOCH_LENGTH;
if (week_cursor >= last_token_time) return 0;
if (week_cursor < _start_time) week_cursor = _start_time;
IVotingEscrow.Point memory old_user_point;
for (uint i = 0; i < 50; i++) {
if (week_cursor >= _last_token_time) break;
if (week_cursor >= user_point.ts && user_epoch <= max_user_epoch) {
user_epoch += 1;
old_user_point = user_point;
if (user_epoch > max_user_epoch) {
user_point = IVotingEscrow.Point(0,0,0,0);
} else {
user_point = IVotingEscrow(ve).user_point_history(_tokenId, user_epoch);
}
} else {
int128 dt = int128(int256(week_cursor - old_user_point.ts));
uint balance_of = (old_user_point.bias - dt * old_user_point.slope) < 0 ? 0 : uint(int256(old_user_point.bias - dt * old_user_point.slope));
if (balance_of == 0 && user_epoch > max_user_epoch) break;
if (balance_of != 0) {
to_distribute += balance_of * tokens_per_week[week_cursor] / ve_supply[week_cursor];
}
week_cursor += Constants.EPOCH_LENGTH;
}
}
return to_distribute;
}
function claimable(uint _tokenId) external view returns (uint) {
uint _last_token_time = last_token_time / Constants.EPOCH_LENGTH * Constants.EPOCH_LENGTH;
return _claimable(_tokenId, voting_escrow, _last_token_time);
}
function claim(uint _tokenId) external returns (uint) {
if (block.timestamp >= time_cursor) _checkpoint_total_supply();
uint _last_token_time = last_token_time;
_last_token_time = _last_token_time / Constants.EPOCH_LENGTH * Constants.EPOCH_LENGTH;
uint amount = _claim(_tokenId, voting_escrow, _last_token_time);
if (amount != 0) {
// if locked.end then send directly
IVotingEscrow.LockedBalance memory _locked = IVotingEscrow(voting_escrow).locked(_tokenId);
if(_locked.end < block.timestamp){
address _nftOwner = IVotingEscrow(voting_escrow).ownerOf(_tokenId);
IERC20(token).safeTransfer(_nftOwner, amount);
} else {
IVotingEscrow(voting_escrow).deposit_for(_tokenId, amount);
}
token_last_balance -= amount;
}
return amount;
}
function claim_many(uint[] memory _tokenIds) external returns (bool) {
if (block.timestamp >= time_cursor) _checkpoint_total_supply();
uint _last_token_time = last_token_time;
_last_token_time = _last_token_time / Constants.EPOCH_LENGTH * Constants.EPOCH_LENGTH;
address _voting_escrow = voting_escrow;
uint total = 0;
for (uint i = 0; i < _tokenIds.length; i++) {
uint _tokenId = _tokenIds[i];
if (_tokenId == 0) break;
uint amount = _claim(_tokenId, _voting_escrow, _last_token_time);
if (amount != 0) {
// if locked.end then send directly
IVotingEscrow.LockedBalance memory _locked = IVotingEscrow(_voting_escrow).locked(_tokenId);
if(_locked.end < block.timestamp){
address _nftOwner = IVotingEscrow(_voting_escrow).ownerOf(_tokenId);
IERC20(token).safeTransfer(_nftOwner, amount);
} else {
IVotingEscrow(_voting_escrow).deposit_for(_tokenId, amount);
}
total += amount;
}
}
if (total != 0) {
token_last_balance -= total;
}
return true;
}
function setDepositor(address _depositor) external {
require(msg.sender == owner);
depositor = _depositor;
}
function setOwner(address _owner) external {
require(msg.sender == owner);
owner = _owner;
}
function withdrawERC20(address _token) external {
require(msg.sender == owner);
require(_token != address(0));
uint256 _balance = IERC20(_token).balanceOf(address(this));
IERC20(_token).safeTransfer(msg.sender, _balance);
}
}