59 lines
2.0 KiB
Solidity
59 lines
2.0 KiB
Solidity
// Brought from https://github.com/aragon/aragonOS/blob/v4.3.0/contracts/common/Initializable.sol
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// Adapted to use pragma ^0.5.17 and satisfy our linter rules
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pragma solidity ^0.5.17;
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import "./TimeHelpers.sol";
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import "./UnstructuredStorage.sol";
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contract Initializable is TimeHelpers {
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using UnstructuredStorage for bytes32;
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// keccak256("aragonOS.initializable.initializationBlock")
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bytes32 internal constant INITIALIZATION_BLOCK_POSITION = 0xebb05b386a8d34882b8711d156f463690983dc47815980fb82aeeff1aa43579e;
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string private constant ERROR_ALREADY_INITIALIZED = "INIT_ALREADY_INITIALIZED";
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string private constant ERROR_NOT_INITIALIZED = "INIT_NOT_INITIALIZED";
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modifier onlyInit {
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require(getInitializationBlock() == 0, ERROR_ALREADY_INITIALIZED);
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_;
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}
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modifier isInitialized {
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require(hasInitialized(), ERROR_NOT_INITIALIZED);
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_;
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}
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/**
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* @return Block number in which the contract was initialized
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*/
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function getInitializationBlock() public view returns (uint256) {
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return INITIALIZATION_BLOCK_POSITION.getStorageUint256();
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}
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/**
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* @return Whether the contract has been initialized by the time of the current block
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*/
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function hasInitialized() public view returns (bool) {
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uint256 initializationBlock = getInitializationBlock();
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return initializationBlock != 0 && getBlockNumber() >= initializationBlock;
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}
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/**
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* @dev Function to be called by top level contract after initialization has finished.
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*/
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function initialized() internal onlyInit {
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INITIALIZATION_BLOCK_POSITION.setStorageUint256(getBlockNumber());
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}
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/**
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* @dev Function to be called by top level contract after initialization to enable the contract
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* at a future block number rather than immediately.
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*/
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function initializedAt(uint256 _blockNumber) internal onlyInit {
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INITIALIZATION_BLOCK_POSITION.setStorageUint256(_blockNumber);
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}
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}
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