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Timelock.sol
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// SPDX-License-Identifier: BSD-3-Clause | |
pragma solidity ^0.8.10; | |
import "./SafeMath.sol"; | |
contract Timelock { | |
using SafeMath for uint; | |
event NewAdmin(address indexed newAdmin); | |
event NewPendingAdmin(address indexed newPendingAdmin); | |
event NewDelay(uint indexed newDelay); | |
event CancelTransaction(bytes32 indexed txHash, address indexed target, uint value, string signature, bytes data, uint eta); | |
event ExecuteTransaction(bytes32 indexed txHash, address indexed target, uint value, string signature, bytes data, uint eta); | |
event QueueTransaction(bytes32 indexed txHash, address indexed target, uint value, string signature, bytes data, uint eta); | |
uint public constant GRACE_PERIOD = 14 days; | |
uint public constant MINIMUM_DELAY = 2 days; | |
uint public constant MAXIMUM_DELAY = 30 days; | |
address public admin; | |
address public pendingAdmin; | |
uint public delay; | |
mapping (bytes32 => bool) public queuedTransactions; | |
constructor(address admin_, uint delay_) public { | |
require(delay_ >= MINIMUM_DELAY, "Timelock::constructor: Delay must exceed minimum delay."); | |
require(delay_ <= MAXIMUM_DELAY, "Timelock::setDelay: Delay must not exceed maximum delay."); | |
admin = admin_; | |
delay = delay_; | |
} | |
fallback() external payable { } | |
function setDelay(uint delay_) public { | |
require(msg.sender == address(this), "Timelock::setDelay: Call must come from Timelock."); | |
require(delay_ >= MINIMUM_DELAY, "Timelock::setDelay: Delay must exceed minimum delay."); | |
require(delay_ <= MAXIMUM_DELAY, "Timelock::setDelay: Delay must not exceed maximum delay."); | |
delay = delay_; | |
emit NewDelay(delay); | |
} | |
function acceptAdmin() public { | |
require(msg.sender == pendingAdmin, "Timelock::acceptAdmin: Call must come from pendingAdmin."); | |
admin = msg.sender; | |
pendingAdmin = address(0); | |
emit NewAdmin(admin); | |
} | |
function setPendingAdmin(address pendingAdmin_) public { | |
require(msg.sender == address(this), "Timelock::setPendingAdmin: Call must come from Timelock."); | |
pendingAdmin = pendingAdmin_; | |
emit NewPendingAdmin(pendingAdmin); | |
} | |
function queueTransaction(address target, uint value, string memory signature, bytes memory data, uint eta) public returns (bytes32) { | |
require(msg.sender == admin, "Timelock::queueTransaction: Call must come from admin."); | |
require(eta >= getBlockTimestamp().add(delay), "Timelock::queueTransaction: Estimated execution block must satisfy delay."); | |
bytes32 txHash = keccak256(abi.encode(target, value, signature, data, eta)); | |
queuedTransactions[txHash] = true; | |
emit QueueTransaction(txHash, target, value, signature, data, eta); | |
return txHash; | |
} | |
function cancelTransaction(address target, uint value, string memory signature, bytes memory data, uint eta) public { | |
require(msg.sender == admin, "Timelock::cancelTransaction: Call must come from admin."); | |
bytes32 txHash = keccak256(abi.encode(target, value, signature, data, eta)); | |
queuedTransactions[txHash] = false; | |
emit CancelTransaction(txHash, target, value, signature, data, eta); | |
} | |
function executeTransaction(address target, uint value, string memory signature, bytes memory data, uint eta) public payable returns (bytes memory) { | |
require(msg.sender == admin, "Timelock::executeTransaction: Call must come from admin."); | |
bytes32 txHash = keccak256(abi.encode(target, value, signature, data, eta)); | |
require(queuedTransactions[txHash], "Timelock::executeTransaction: Transaction hasn't been queued."); | |
require(getBlockTimestamp() >= eta, "Timelock::executeTransaction: Transaction hasn't surpassed time lock."); | |
require(getBlockTimestamp() <= eta.add(GRACE_PERIOD), "Timelock::executeTransaction: Transaction is stale."); | |
queuedTransactions[txHash] = false; | |
bytes memory callData; | |
if (bytes(signature).length == 0) { | |
callData = data; | |
} else { | |
callData = abi.encodePacked(bytes4(keccak256(bytes(signature))), data); | |
} | |
// solium-disable-next-line security/no-call-value | |
(bool success, bytes memory returnData) = target.call{value: value}(callData); | |
require(success, "Timelock::executeTransaction: Transaction execution reverted."); | |
emit ExecuteTransaction(txHash, target, value, signature, data, eta); | |
return returnData; | |
} | |
function getBlockTimestamp() internal view returns (uint) { | |
// solium-disable-next-line security/no-block-members | |
return block.timestamp; | |
} | |
} |
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