github.com/jeffallen/go-ethereum@v1.1.4-0.20150910155051-571d3236c49c/core/canary.go (about)

     1  // Copyright 2015 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser 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  // The go-ethereum library 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 Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package core
    18  
    19  import (
    20  	"math/big"
    21  
    22  	"github.com/ethereum/go-ethereum/common"
    23  	"github.com/ethereum/go-ethereum/core/state"
    24  )
    25  
    26  var (
    27  	jeff      = common.HexToAddress("959c33de5961820567930eccce51ea715c496f85")
    28  	vitalik   = common.HexToAddress("c8158da0b567a8cc898991c2c2a073af67dc03a9")
    29  	christoph = common.HexToAddress("7a19a893f91d5b6e2cdf941b6acbba2cbcf431ee")
    30  	gav       = common.HexToAddress("539dd9aaf45c3feb03f9c004f4098bd3268fef6b")
    31  )
    32  
    33  // Canary will check the 0'd address of the 4 contracts above.
    34  // If two or more are set to anything other than a 0 the canary
    35  // dies a horrible death.
    36  func Canary(statedb *state.StateDB) bool {
    37  	var r int
    38  	if (statedb.GetState(jeff, common.Hash{}).Big().Cmp(big.NewInt(0)) > 0) {
    39  		r++
    40  	}
    41  	if (statedb.GetState(gav, common.Hash{}).Big().Cmp(big.NewInt(0)) > 0) {
    42  		r++
    43  	}
    44  	if (statedb.GetState(christoph, common.Hash{}).Big().Cmp(big.NewInt(0)) > 0) {
    45  		r++
    46  	}
    47  	if (statedb.GetState(vitalik, common.Hash{}).Big().Cmp(big.NewInt(0)) > 0) {
    48  		r++
    49  	}
    50  	return r > 1
    51  }