github.com/codingfuture/orig-energi3@v0.8.4/energi/contracts/src/GovernedContract.sol (about)

     1  // Copyright 2019 The Energi Core Authors
     2  // This file is part of Energi Core.
     3  //
     4  // Energi Core is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // Energi Core is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU General Public License
    15  // along with Energi Core. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  // Energi Governance system is the fundamental part of Energi Core.
    18  
    19  // NOTE: It's not allowed to change the compiler due to byte-to-byte
    20  //       match requirement.
    21  pragma solidity 0.5.16;
    22  //pragma experimental SMTChecker;
    23  
    24  import { IGovernedContract } from "./IGovernedContract.sol";
    25  
    26  /**
    27   * Genesis version of GovernedContract common base.
    28   *
    29   * Base Consensus interface for upgradable contracts.
    30   * Unlike common approach, the implementation is NOT expected to be
    31   * called through delegatecall() to minimize risks of shared storage.
    32   *
    33   * NOTE: it MUST NOT change after blockchain launch!
    34   */
    35  contract GovernedContract is IGovernedContract {
    36      address public proxy;
    37  
    38      constructor(address _proxy) public {
    39          proxy = _proxy;
    40      }
    41  
    42      modifier requireProxy {
    43          require(msg.sender == proxy, "Not proxy");
    44          _;
    45      }
    46  
    47      function migrate(IGovernedContract _oldImpl) external requireProxy {
    48          _migrate(_oldImpl);
    49      }
    50  
    51      function destroy(IGovernedContract _newImpl) external requireProxy {
    52          _destroy(_newImpl);
    53          selfdestruct(address(_newImpl));
    54      }
    55  
    56      // solium-disable-next-line no-empty-blocks
    57      function _migrate(IGovernedContract) internal {}
    58  
    59      // solium-disable-next-line no-empty-blocks
    60      function _destroy(IGovernedContract) internal {}
    61  
    62      function _callerAddress()
    63          internal view
    64          returns (address payable)
    65      {
    66          if (msg.sender == proxy) {
    67              // This is guarantee of the GovernedProxy
    68              // solium-disable-next-line security/no-tx-origin
    69              return tx.origin;
    70          } else {
    71              return msg.sender;
    72          }
    73      }
    74  }
    75  
    76