100 lines
2.7 KiB
Solidity
100 lines
2.7 KiB
Solidity
pragma solidity ^0.4.17;
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import "../common/Controlled.sol";
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contract Factory is Controlled {
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event NewKernel(address newKernel, bytes32 codeHash);
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struct Version {
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uint256 blockNumber;
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uint256 timestamp;
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address kernel;
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bytes32 codeHash;
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}
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mapping(bytes32 => uint256) hashToVersion;
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mapping(address => uint256) versionMap;
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Version[] versionLog;
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uint256 latestUpdate;
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address latestKernel;
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function Factory(address _kernel)
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public
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{
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_setKernel(_kernel);
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}
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function setKernel(address _kernel)
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external
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onlyController
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{
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_setKernel(_kernel);
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}
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function getVersion(uint256 index)
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public
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view
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returns(
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uint256 blockNumber,
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uint256 timestamp,
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address kernel,
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bytes32 codeHash
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)
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{
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return (
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versionLog[index].blockNumber,
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versionLog[index].timestamp,
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versionLog[index].kernel,
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versionLog[index].codeHash
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);
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}
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function isKernel(bytes32 _codeHash) public view returns (bool){
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return hashToVersion[_codeHash] > 0;
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}
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function isKernel(address _addr) public view returns (bool){
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return versionMap[_addr] > 0;
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}
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function getCodeHash(address _addr)
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public
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view
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returns (bytes32 codeHash)
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{
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bytes memory o_code;
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uint size;
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assembly {
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// retrieve the size of the code, this needs assembly
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size := extcodesize(_addr)
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}
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require (size > 0);
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assembly {
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// allocate output byte array - this could also be done without assembly
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// by using o_code = new bytes(size)
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o_code := mload(0x40)
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// new "memory end" including padding
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mstore(0x40, add(o_code, and(add(add(size, 0x20), 0x1f), not(0x1f))))
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// store length in memory
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mstore(o_code, size)
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// actually retrieve the code, this needs assembly
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extcodecopy(_addr, add(o_code, 0x20), 0, size)
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}
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codeHash = keccak256(o_code);
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}
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function _setKernel(address _kernel)
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internal
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{
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require(_kernel != latestKernel);
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bytes32 _codeHash = getCodeHash(_kernel);
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versionMap[_kernel] = versionLog.length;
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hashToVersion[_codeHash] = versionLog.length;
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versionLog.push(Version({blockNumber: block.number, timestamp: block.timestamp, kernel: _kernel, codeHash: _codeHash}));
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latestUpdate = block.timestamp;
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latestKernel = _kernel;
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emit NewKernel(_kernel, _codeHash);
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}
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} |