mirror of https://github.com/embarklabs/embark.git
41 lines
1.3 KiB
Solidity
41 lines
1.3 KiB
Solidity
|
pragma solidity >=0.5.0 <0.6.0;
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @title Proxiable
|
||
|
|
* @dev Contracts that are meant to be upgradable must inherit from this contract
|
||
|
|
*/
|
||
|
|
contract Proxiable {
|
||
|
|
bool internal _initialized;
|
||
|
|
|
||
|
|
event Upgraded(address indexed implementation);
|
||
|
|
|
||
|
|
function proxiableUUID() public pure returns (bytes32) {
|
||
|
|
return 0xc5f16f0fcc639fa48a6947836d9850f504798523bf8c9a3a87d5876cf622bcf7;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @notice Checks if the contract is initialized
|
||
|
|
* @return Init status
|
||
|
|
*/
|
||
|
|
function isInitialized() public view returns(bool) {
|
||
|
|
return _initialized;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @dev Update code logic
|
||
|
|
* @param newAddress address where the contract logic is located at
|
||
|
|
*/
|
||
|
|
function updateCodeAddress(address newAddress) internal {
|
||
|
|
// Code position in storage is keccak256("PROXIABLE") = "0xc5f16f0fcc639fa48a6947836d9850f504798523bf8c9a3a87d5876cf622bcf7"
|
||
|
|
require(
|
||
|
|
bytes32(0xc5f16f0fcc639fa48a6947836d9850f504798523bf8c9a3a87d5876cf622bcf7) == Proxiable(newAddress).proxiableUUID(),
|
||
|
|
"Not compatible"
|
||
|
|
);
|
||
|
|
assembly { // solium-disable-line
|
||
|
|
sstore(0xc5f16f0fcc639fa48a6947836d9850f504798523bf8c9a3a87d5876cf622bcf7, newAddress)
|
||
|
|
}
|
||
|
|
emit Upgraded(newAddress);
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|