Contract Source Code:
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.2 <0.8.0;
/**
* @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);
}
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
* @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);
}
// SPDX-License-Identifier: MIT
/*
* MIT License
* ===========
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*/
pragma solidity 0.7.6;
import "./IERC20.sol";
interface IPENDLE is IERC20 {
function initiateConfigChanges(
uint256 _emissionRateMultiplierNumerator,
uint256 _terminalInflationRateNumerator,
address _liquidityIncentivesRecipient,
bool _isBurningAllowed
) external;
function increaseAllowance(address spender, uint256 addedValue) external returns (bool);
function decreaseAllowance(address spender, uint256 subtractedValue) external returns (bool);
function burn(uint256 amount) external returns (bool);
function applyConfigChanges() external;
function claimLiquidityEmissions() external returns (uint256 totalEmissions);
function isPendleToken() external view returns (bool);
function getPriorVotes(address account, uint256 blockNumber) external view returns (uint256);
function startTime() external view returns (uint256);
function configChangesInitiated() external view returns (uint256);
function emissionRateMultiplierNumerator() external view returns (uint256);
function terminalInflationRateNumerator() external view returns (uint256);
function liquidityIncentivesRecipient() external view returns (address);
function isBurningAllowed() external view returns (bool);
function pendingEmissionRateMultiplierNumerator() external view returns (uint256);
function pendingTerminalInflationRateNumerator() external view returns (uint256);
function pendingLiquidityIncentivesRecipient() external view returns (address);
function pendingIsBurningAllowed() external view returns (bool);
}
/* solhint-disable const-name-snakecase*/
// SPDX-License-Identifier: MIT
/*
* MIT License
* ===========
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*/
pragma solidity 0.7.6;
pragma experimental ABIEncoderV2;
import "./IPENDLE.sol";
import "./Permissions.sol";
import "./Withdrawable.sol";
import "./SafeMath.sol";
/**
* @notice The mechanics for delegating votes to other accounts is adapted from Compound
* https://github.com/compound-finance/compound-protocol/blob/master/contracts/Governance/Comp.sol
***/
contract PENDLE is IPENDLE, Permissions, Withdrawable {
using SafeMath for uint256;
/// @notice A checkpoint for marking number of votes from a given block
struct Checkpoint {
uint32 fromBlock;
uint256 votes;
}
bool public constant override isPendleToken = true;
string public constant name = "Pendle";
string public constant symbol = "PENDLE";
uint8 public constant decimals = 18;
uint256 public override totalSupply;
uint256 private constant TEAM_INVESTOR_ADVISOR_AMOUNT = 94917125 * 1e18;
uint256 private constant ECOSYSTEM_FUND_TOKEN_AMOUNT = 46 * 1_000_000 * 1e18;
uint256 private constant PUBLIC_SALES_TOKEN_AMOUNT = 16582875 * 1e18;
uint256 private constant INITIAL_LIQUIDITY_EMISSION = 1200000 * 1e18;
uint256 private constant CONFIG_DENOMINATOR = 1_000_000_000_000;
uint256 private constant CONFIG_CHANGES_TIME_LOCK = 7 days;
uint256 public override emissionRateMultiplierNumerator;
uint256 public override terminalInflationRateNumerator;
address public override liquidityIncentivesRecipient;
bool public override isBurningAllowed;
uint256 public override pendingEmissionRateMultiplierNumerator;
uint256 public override pendingTerminalInflationRateNumerator;
address public override pendingLiquidityIncentivesRecipient;
bool public override pendingIsBurningAllowed;
uint256 public override configChangesInitiated;
uint256 public override startTime;
uint256 public lastWeeklyEmission;
uint256 public lastWeekEmissionSent;
mapping(address => mapping(address => uint256)) internal allowances;
mapping(address => uint256) internal balances;
mapping(address => address) public delegates;
/// @notice A record of votes checkpoints for each account, by index
mapping(address => mapping(uint32 => Checkpoint)) public checkpoints;
/// @notice The number of checkpoints for each account
mapping(address => uint32) public numCheckpoints;
/// @notice The EIP-712 typehash for the contract's domain
bytes32 public constant DOMAIN_TYPEHASH =
keccak256("EIP712Domain(string name,uint256 chainId,address verifyingContract)");
/// @notice The EIP-712 typehash for the delegation struct used by the contract
bytes32 public constant DELEGATION_TYPEHASH =
keccak256("Delegation(address delegatee,uint256 nonce,uint256 expiry)");
/// @notice A record of states for signing / validating signatures
mapping(address => uint256) public nonces;
/// @notice An event thats emitted when an account changes its delegate
event DelegateChanged(
address indexed delegator,
address indexed fromDelegate,
address indexed toDelegate
);
/// @notice An event thats emitted when a delegate account's vote balance changes
event DelegateVotesChanged(
address indexed delegate,
uint256 previousBalance,
uint256 newBalance
);
event PendingConfigChanges(
uint256 pendingEmissionRateMultiplierNumerator,
uint256 pendingTerminalInflationRateNumerator,
address pendingLiquidityIncentivesRecipient,
bool pendingIsBurningAllowed
);
event ConfigsChanged(
uint256 emissionRateMultiplierNumerator,
uint256 terminalInflationRateNumerator,
address liquidityIncentivesRecipient,
bool isBurningAllowed
);
/**
* @notice Construct a new PENDLE token
*/
constructor(
address _governance,
address pendleTeamTokens,
address pendleEcosystemFund,
address salesMultisig,
address _liquidityIncentivesRecipient
) Permissions(_governance) {
require(
pendleTeamTokens != address(0) &&
pendleEcosystemFund != address(0) &&
salesMultisig != address(0) &&
_liquidityIncentivesRecipient != address(0),
"ZERO_ADDRESS"
);
_mint(pendleTeamTokens, TEAM_INVESTOR_ADVISOR_AMOUNT);
_mint(pendleEcosystemFund, ECOSYSTEM_FUND_TOKEN_AMOUNT);
_mint(salesMultisig, PUBLIC_SALES_TOKEN_AMOUNT);
_mint(_liquidityIncentivesRecipient, INITIAL_LIQUIDITY_EMISSION * 26);
emissionRateMultiplierNumerator = (CONFIG_DENOMINATOR * 989) / 1000; // emission rate = 98.9% -> 1.1% decay
terminalInflationRateNumerator = 379848538; // terminal inflation rate = 2% => weekly inflation = 0.0379848538%
liquidityIncentivesRecipient = _liquidityIncentivesRecipient;
startTime = block.timestamp;
lastWeeklyEmission = INITIAL_LIQUIDITY_EMISSION;
lastWeekEmissionSent = 26; // already done liquidity emissions for the first 26 weeks
}
/**
* @notice Approve `spender` to transfer up to `amount` from `src`
* @dev This will overwrite the approval amount for `spender`
* and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve)
* @param spender The address of the account which may transfer tokens
* @param amount The number of tokens that are approved
* @return Whether or not the approval succeeded
**/
function approve(address spender, uint256 amount) external override returns (bool) {
_approve(msg.sender, spender, amount);
return true;
}
/**
* @notice Transfer `amount` tokens from `msg.sender` to `dst`
* @param dst The address of the destination account
* @param amount The number of tokens to transfer
* @return Whether or not the transfer succeeded
*/
function transfer(address dst, uint256 amount) external override returns (bool) {
_transfer(msg.sender, dst, amount);
return true;
}
/**
* @notice Transfer `amount` tokens from `src` to `dst`
* @param src The address of the source account
* @param dst The address of the destination account
* @param amount The number of tokens to transfer
* @return Whether or not the transfer succeeded
*/
function transferFrom(
address src,
address dst,
uint256 amount
) external override returns (bool) {
_transfer(src, dst, amount);
_approve(
src,
msg.sender,
allowances[src][msg.sender].sub(amount, "TRANSFER_EXCEED_ALLOWANCE")
);
return true;
}
/**
* @dev Increases the allowance granted to spender by the caller.
* @param spender The address to increase the allowance from.
* @param addedValue The amount allowance to add.
* @return returns true if allowance has increased, otherwise false
**/
function increaseAllowance(address spender, uint256 addedValue)
public
override
returns (bool)
{
_approve(msg.sender, spender, allowances[msg.sender][spender].add(addedValue));
return true;
}
/**
* @dev Decreases the allowance granted to spender by the caller.
* @param spender The address to reduce the allowance from.
* @param subtractedValue The amount allowance to subtract.
* @return Returns true if allowance has decreased, otherwise false.
**/
function decreaseAllowance(address spender, uint256 subtractedValue)
public
override
returns (bool)
{
_approve(
msg.sender,
spender,
allowances[msg.sender][spender].sub(subtractedValue, "NEGATIVE_ALLOWANCE")
);
return true;
}
/**
* @dev Burns an amount of tokens from the msg.sender
* @param amount The amount to burn
* @return Returns true if the operation is successful
**/
function burn(uint256 amount) public override returns (bool) {
require(isBurningAllowed, "BURNING_NOT_ALLOWED");
_burn(msg.sender, amount);
return true;
}
/**
* @notice Get the number of tokens `spender` is approved to spend on behalf of `account`
* @param account The address of the account holding the funds
* @param spender The address of the account spending the funds
* @return The number of tokens approved
**/
function allowance(address account, address spender) external view override returns (uint256) {
return allowances[account][spender];
}
/**
* @notice Get the number of tokens held by the `account`
* @param account The address of the account to get the balance of
* @return The number of tokens held
*/
function balanceOf(address account) external view override returns (uint256) {
return balances[account];
}
/**
* @notice Gets the current votes balance for `account`
* @param account The address to get votes balance
* @return The number of current votes for `account`
*/
function getCurrentVotes(address account) external view returns (uint256) {
uint32 nCheckpoints = numCheckpoints[account];
return nCheckpoints > 0 ? checkpoints[account][nCheckpoints - 1].votes : 0;
}
/**
* @notice Delegate votes from `msg.sender` to `delegatee`
* @param delegatee The address to delegate votes to
*/
function delegate(address delegatee) public {
return _delegate(msg.sender, delegatee);
}
/**
* @notice Delegates votes from signatory to `delegatee`
* @param delegatee The address to delegate votes to
* @param nonce The contract state required to match the signature
* @param expiry The time at which to expire the signature
* @param v The recovery byte of the signature
* @param r Half of the ECDSA signature pair
* @param s Half of the ECDSA signature pair
*/
function delegateBySig(
address delegatee,
uint256 nonce,
uint256 expiry,
uint8 v,
bytes32 r,
bytes32 s
) public {
bytes32 domainSeparator =
keccak256(
abi.encode(DOMAIN_TYPEHASH, keccak256(bytes(name)), getChainId(), address(this))
);
bytes32 structHash = keccak256(abi.encode(DELEGATION_TYPEHASH, delegatee, nonce, expiry));
bytes32 digest = keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
address signatory = ecrecover(digest, v, r, s);
require(signatory != address(0), "INVALID_SIGNATURE");
require(nonce == nonces[signatory]++, "INVALID_NONCE");
require(block.timestamp <= expiry, "SIGNATURE_EXPIRED");
return _delegate(signatory, delegatee);
}
/**
* @notice Determine the prior number of votes for an account as of a block number
* @dev Block number must be a finalized block or else
this function will revert to prevent misinformation
* @param account The address of the account to check
* @param blockNumber The block number to get the vote balance at
* @return The number of votes the account had as of the given block
*/
function getPriorVotes(address account, uint256 blockNumber)
public
view
override
returns (uint256)
{
require(blockNumber < block.number, "NOT_YET_DETERMINED");
uint32 nCheckpoints = numCheckpoints[account];
if (nCheckpoints == 0) {
return 0;
}
// First check most recent balance
if (checkpoints[account][nCheckpoints - 1].fromBlock <= blockNumber) {
return checkpoints[account][nCheckpoints - 1].votes;
}
// Next check implicit zero balance
if (checkpoints[account][0].fromBlock > blockNumber) {
return 0;
}
uint32 lower = 0;
uint32 upper = nCheckpoints - 1;
while (upper > lower) {
uint32 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
Checkpoint memory cp = checkpoints[account][center];
if (cp.fromBlock == blockNumber) {
return cp.votes;
} else if (cp.fromBlock < blockNumber) {
lower = center;
} else {
upper = center - 1;
}
}
return checkpoints[account][lower].votes;
}
function _delegate(address delegator, address delegatee) internal {
address currentDelegate = delegates[delegator];
uint256 delegatorBalance = balances[delegator];
delegates[delegator] = delegatee;
emit DelegateChanged(delegator, currentDelegate, delegatee);
_moveDelegates(currentDelegate, delegatee, delegatorBalance);
}
function _transfer(
address src,
address dst,
uint256 amount
) internal {
require(src != address(0), "SENDER_ZERO_ADDR");
require(dst != address(0), "RECEIVER_ZERO_ADDR");
require(dst != address(this), "SEND_TO_TOKEN_CONTRACT");
balances[src] = balances[src].sub(amount, "TRANSFER_EXCEED_BALANCE");
balances[dst] = balances[dst].add(amount);
emit Transfer(src, dst, amount);
_moveDelegates(delegates[src], delegates[dst], amount);
}
function _approve(
address src,
address dst,
uint256 amount
) internal virtual {
require(src != address(0), "OWNER_ZERO_ADDR");
require(dst != address(0), "SPENDER_ZERO_ADDR");
allowances[src][dst] = amount;
emit Approval(src, dst, amount);
}
function _moveDelegates(
address srcRep,
address dstRep,
uint256 amount
) internal {
if (srcRep != dstRep && amount > 0) {
if (srcRep != address(0)) {
uint32 srcRepNum = numCheckpoints[srcRep];
uint256 srcRepOld = srcRepNum > 0 ? checkpoints[srcRep][srcRepNum - 1].votes : 0;
uint256 srcRepNew = srcRepOld.sub(amount);
_writeCheckpoint(srcRep, srcRepNum, srcRepOld, srcRepNew);
}
if (dstRep != address(0)) {
uint32 dstRepNum = numCheckpoints[dstRep];
uint256 dstRepOld = dstRepNum > 0 ? checkpoints[dstRep][dstRepNum - 1].votes : 0;
uint256 dstRepNew = dstRepOld.add(amount);
_writeCheckpoint(dstRep, dstRepNum, dstRepOld, dstRepNew);
}
}
}
function _writeCheckpoint(
address delegatee,
uint32 nCheckpoints,
uint256 oldVotes,
uint256 newVotes
) internal {
uint32 blockNumber = safe32(block.number, "BLOCK_NUM_EXCEED_32_BITS");
if (
nCheckpoints > 0 && checkpoints[delegatee][nCheckpoints - 1].fromBlock == blockNumber
) {
checkpoints[delegatee][nCheckpoints - 1].votes = newVotes;
} else {
checkpoints[delegatee][nCheckpoints] = Checkpoint(blockNumber, newVotes);
numCheckpoints[delegatee] = nCheckpoints + 1;
}
emit DelegateVotesChanged(delegatee, oldVotes, newVotes);
}
function safe32(uint256 n, string memory errorMessage) internal pure returns (uint32) {
require(n < 2**32, errorMessage);
return uint32(n);
}
function getChainId() internal pure returns (uint256) {
uint256 chainId;
assembly {
chainId := chainid()
}
return chainId;
}
function initiateConfigChanges(
uint256 _emissionRateMultiplierNumerator,
uint256 _terminalInflationRateNumerator,
address _liquidityIncentivesRecipient,
bool _isBurningAllowed
) external override onlyGovernance {
require(_liquidityIncentivesRecipient != address(0), "ZERO_ADDRESS");
pendingEmissionRateMultiplierNumerator = _emissionRateMultiplierNumerator;
pendingTerminalInflationRateNumerator = _terminalInflationRateNumerator;
pendingLiquidityIncentivesRecipient = _liquidityIncentivesRecipient;
pendingIsBurningAllowed = _isBurningAllowed;
emit PendingConfigChanges(
_emissionRateMultiplierNumerator,
_terminalInflationRateNumerator,
_liquidityIncentivesRecipient,
_isBurningAllowed
);
configChangesInitiated = block.timestamp;
}
function applyConfigChanges() external override {
require(configChangesInitiated != 0, "UNINITIATED_CONFIG_CHANGES");
require(
block.timestamp > configChangesInitiated + CONFIG_CHANGES_TIME_LOCK,
"TIMELOCK_IS_NOT_OVER"
);
_mintLiquidityEmissions(); // We must settle the pending liquidity emissions first, to make sure the weeks in the past follow the old configs
emissionRateMultiplierNumerator = pendingEmissionRateMultiplierNumerator;
terminalInflationRateNumerator = pendingTerminalInflationRateNumerator;
liquidityIncentivesRecipient = pendingLiquidityIncentivesRecipient;
isBurningAllowed = pendingIsBurningAllowed;
configChangesInitiated = 0;
emit ConfigsChanged(
emissionRateMultiplierNumerator,
terminalInflationRateNumerator,
liquidityIncentivesRecipient,
isBurningAllowed
);
}
function claimLiquidityEmissions() external override returns (uint256 totalEmissions) {
require(msg.sender == liquidityIncentivesRecipient, "NOT_INCENTIVES_RECIPIENT");
totalEmissions = _mintLiquidityEmissions();
}
function _mintLiquidityEmissions() internal returns (uint256 totalEmissions) {
uint256 _currentWeek = _getCurrentWeek();
if (_currentWeek <= lastWeekEmissionSent) {
return 0;
}
for (uint256 i = lastWeekEmissionSent + 1; i <= _currentWeek; i++) {
if (i <= 259) {
lastWeeklyEmission = lastWeeklyEmission.mul(emissionRateMultiplierNumerator).div(
CONFIG_DENOMINATOR
);
} else {
lastWeeklyEmission = totalSupply.mul(terminalInflationRateNumerator).div(
CONFIG_DENOMINATOR
);
}
_mint(liquidityIncentivesRecipient, lastWeeklyEmission);
totalEmissions = totalEmissions.add(lastWeeklyEmission);
}
lastWeekEmissionSent = _currentWeek;
}
// get current 1-indexed week id
function _getCurrentWeek() internal view returns (uint256 weekId) {
weekId = (block.timestamp - startTime) / (7 days) + 1;
}
function _mint(address account, uint256 amount) internal {
require(account != address(0), "MINT_TO_ZERO_ADDR");
totalSupply = totalSupply.add(amount);
balances[account] = balances[account].add(amount);
emit Transfer(address(0), account, amount);
}
function _burn(address account, uint256 amount) internal {
require(account != address(0), "BURN_FROM_ZERO_ADDRESS");
uint256 accountBalance = balances[account];
require(accountBalance >= amount, "BURN_EXCEED_BALANCE");
balances[account] = accountBalance.sub(amount);
totalSupply = totalSupply.sub(amount);
emit Transfer(account, address(0), amount);
}
}
// SPDX-License-Identifier: MIT
/*
* MIT License
* ===========
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*/
pragma solidity 0.7.6;
import "./IERC20.sol";
abstract contract Permissions {
address public governance;
address public pendingGovernance;
address internal initializer;
event GovernanceClaimed(address newGovernance, address previousGovernance);
event TransferGovernancePending(address pendingGovernance);
constructor(address _governance) {
require(_governance != address(0), "ZERO_ADDRESS");
initializer = msg.sender;
governance = _governance;
}
modifier initialized() {
require(initializer == address(0), "NOT_INITIALIZED");
_;
}
modifier onlyGovernance() {
require(msg.sender == governance, "ONLY_GOVERNANCE");
_;
}
/**
* @dev Allows the pendingGovernance address to finalize the change governance process.
*/
function claimGovernance() public {
require(pendingGovernance == msg.sender, "WRONG_GOVERNANCE");
emit GovernanceClaimed(pendingGovernance, governance);
governance = pendingGovernance;
pendingGovernance = address(0);
}
/**
* @dev Allows the current governance to set the pendingGovernance address.
* @param _governance The address to transfer ownership to.
*/
function transferGovernance(address _governance) public onlyGovernance {
require(_governance != address(0), "ZERO_ADDRESS");
pendingGovernance = _governance;
emit TransferGovernancePending(pendingGovernance);
}
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
import "./IERC20.sol";
import "./SafeMath.sol";
import "./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 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");
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, 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;
}
}
// SPDX-License-Identifier: MIT
/*
* MIT License
* ===========
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*/
pragma solidity 0.7.6;
import "./IERC20.sol";
import "./SafeERC20.sol";
import "./Permissions.sol";
abstract contract Withdrawable is Permissions {
using SafeERC20 for IERC20;
event EtherWithdraw(uint256 amount, address sendTo);
event TokenWithdraw(IERC20 token, uint256 amount, address sendTo);
/**
* @dev Allows governance to withdraw Ether in a Pendle contract
* in case of accidental ETH transfer into the contract.
* @param amount The amount of Ether to withdraw.
* @param sendTo The recipient address.
*/
function withdrawEther(uint256 amount, address payable sendTo) external onlyGovernance {
(bool success, ) = sendTo.call{value: amount}("");
require(success, "WITHDRAW_FAILED");
emit EtherWithdraw(amount, sendTo);
}
/**
* @dev Allows governance to withdraw all IERC20 compatible tokens in a Pendle
* contract in case of accidental token transfer into the contract.
* @param token IERC20 The address of the token contract.
* @param amount The amount of IERC20 tokens to withdraw.
* @param sendTo The recipient address.
*/
function withdrawToken(
IERC20 token,
uint256 amount,
address sendTo
) external onlyGovernance {
token.safeTransfer(sendTo, amount);
emit TokenWithdraw(token, amount, sendTo);
}
}