Address Details
contract
0xf244eA81F715F343040569398A4E7978De656bf6
- Contract Name
- UpgradeBeaconProxy
- Creator
- 0x60f78e–600437 at 0xd77e4d–86c2d6
- Balance
- 9,908.342671737452390237 CELO ( )
- Locked CELO Balance
- 0.00 CELO
- Voting CELO Balance
- 0.00 CELO
- Pending Unlocked Gold
- 0.00 CELO
- Tokens
-
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- Transactions
- 7,864 Transactions
- Transfers
- 1,099 Transfers
- Gas Used
- 875,886,887
- Last Balance Update
- 28006463
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- Contract name:
- UpgradeBeaconProxy
- Optimization enabled
- true
- Compiler version
- v0.7.6+commit.7338295f
- Optimization runs
- 999999
- EVM Version
- istanbul
- Verified at
- 2021-09-14T21:30:59.322332Z
Contract source code
// SPDX-License-Identifier: MIT pragma solidity >=0.6.11; // ============ External Imports ============ import {Address} from "./Address.sol"; /** * @title UpgradeBeaconProxy * @notice * Proxy contract which delegates all logic, including initialization, * to an implementation contract. * The implementation contract is stored within an Upgrade Beacon contract; * the implementation contract can be changed by performing an upgrade on the Upgrade Beacon contract. * The Upgrade Beacon contract for this Proxy is immutably specified at deployment. * @dev This implementation combines the gas savings of keeping the UpgradeBeacon address outside of contract storage * found in 0age's implementation: * https://github.com/dharma-eng/dharma-smart-wallet/blob/master/contracts/proxies/smart-wallet/UpgradeBeaconProxyV1.sol * With the added safety checks that the UpgradeBeacon and implementation are contracts at time of deployment * found in OpenZeppelin's implementation: * https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/proxy/beacon/BeaconProxy.sol */ contract UpgradeBeaconProxy { // ============ Immutables ============ // Upgrade Beacon address is immutable (therefore not kept in contract storage) address private immutable upgradeBeacon; // ============ Constructor ============ /** * @notice Validate that the Upgrade Beacon is a contract, then set its * address immutably within this contract. * Validate that the implementation is also a contract, * Then call the initialization function defined at the implementation. * The deployment will revert and pass along the * revert reason if the initialization function reverts. * @param _upgradeBeacon Address of the Upgrade Beacon to be stored immutably in the contract * @param _initializationCalldata Calldata supplied when calling the initialization function */ constructor(address _upgradeBeacon, bytes memory _initializationCalldata) payable { // Validate the Upgrade Beacon is a contract require(Address.isContract(_upgradeBeacon), "beacon !contract"); // set the Upgrade Beacon upgradeBeacon = _upgradeBeacon; // Validate the implementation is a contract address _implementation = _getImplementation(_upgradeBeacon); require( Address.isContract(_implementation), "beacon implementation !contract" ); // Call the initialization function on the implementation if (_initializationCalldata.length > 0) { _initialize(_implementation, _initializationCalldata); } } // ============ External Functions ============ /** * @notice Forwards all calls with data to _fallback() * No public functions are declared on the contract, so all calls hit fallback */ fallback() external payable { _fallback(); } /** * @notice Forwards all calls with no data to _fallback() */ receive() external payable { _fallback(); } // ============ Private Functions ============ /** * @notice Call the initialization function on the implementation * Used at deployment to initialize the proxy * based on the logic for initialization defined at the implementation * @param _implementation - Contract to which the initalization is delegated * @param _initializationCalldata - Calldata supplied when calling the initialization function */ function _initialize( address _implementation, bytes memory _initializationCalldata ) private { // Delegatecall into the implementation, supplying initialization calldata. (bool _ok, ) = _implementation.delegatecall(_initializationCalldata); // Revert and include revert data if delegatecall to implementation reverts. if (!_ok) { assembly { returndatacopy(0, 0, returndatasize()) revert(0, returndatasize()) } } } /** * @notice Delegates function calls to the implementation contract returned by the Upgrade Beacon */ function _fallback() private { _delegate(_getImplementation()); } /** * @notice Delegate function execution to the implementation contract * @dev This is a low level function that doesn't return to its internal * call site. It will return whatever is returned by the implementation to the * external caller, reverting and returning the revert data if implementation * reverts. * @param _implementation - Address to which the function execution is delegated */ function _delegate(address _implementation) private { assembly { // Copy msg.data. We take full control of memory in this inline assembly // block because it will not return to Solidity code. We overwrite the // Solidity scratch pad at memory position 0. calldatacopy(0, 0, calldatasize()) // Delegatecall to the implementation, supplying calldata and gas. // Out and outsize are set to zero - instead, use the return buffer. let result := delegatecall( gas(), _implementation, 0, calldatasize(), 0, 0 ) // Copy the returned data from the return buffer. returndatacopy(0, 0, returndatasize()) switch result // Delegatecall returns 0 on error. case 0 { revert(0, returndatasize()) } default { return(0, returndatasize()) } } } /** * @notice Call the Upgrade Beacon to get the current implementation contract address * @return _implementation Address of the current implementation. */ function _getImplementation() private view returns (address _implementation) { _implementation = _getImplementation(upgradeBeacon); } /** * @notice Call the Upgrade Beacon to get the current implementation contract address * @dev _upgradeBeacon is passed as a parameter so that * we can also use this function in the constructor, * where we can't access immutable variables. * @param _upgradeBeacon Address of the UpgradeBeacon storing the current implementation * @return _implementation Address of the current implementation. */ function _getImplementation(address _upgradeBeacon) private view returns (address _implementation) { // Get the current implementation address from the upgrade beacon. (bool _ok, bytes memory _returnData) = _upgradeBeacon.staticcall(""); // Revert and pass along revert message if call to upgrade beacon reverts. require(_ok, string(_returnData)); // Set the implementation to the address returned from the upgrade beacon. _implementation = abi.decode(_returnData, (address)); } }
Contract ABI
[{"type":"constructor","stateMutability":"payable","inputs":[{"type":"address","name":"_upgradeBeacon","internalType":"address"},{"type":"bytes","name":"_initializationCalldata","internalType":"bytes"}]},{"type":"fallback","stateMutability":"payable"},{"type":"receive","stateMutability":"payable"}]
Contract Creation Code
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Deployed ByteCode
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