github.com/devfans/go-ethereum@v1.5.10-0.20170326212234-7419d0c38291/pow/pow.go (about)

     1  // Copyright 2014 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 pow
    18  
    19  import (
    20  	"math/big"
    21  
    22  	"github.com/ethereum/go-ethereum/common"
    23  	"github.com/ethereum/go-ethereum/core/types"
    24  )
    25  
    26  type Block interface {
    27  	Difficulty() *big.Int
    28  	HashNoNonce() common.Hash
    29  	Nonce() uint64
    30  	MixDigest() common.Hash
    31  	NumberU64() uint64
    32  }
    33  
    34  type ChainManager interface {
    35  	GetBlockByNumber(uint64) *types.Block
    36  	CurrentBlock() *types.Block
    37  }
    38  
    39  type PoW interface {
    40  	Verify(block Block) error
    41  	Search(block Block, stop <-chan struct{}) (uint64, []byte)
    42  	Hashrate() float64
    43  }
    44  
    45  // FakePow is a non-validating proof of work implementation.
    46  // It returns true from Verify for any block.
    47  type FakePow struct{}
    48  
    49  // Verify implements PoW, returning a success for an input.
    50  func (pow FakePow) Verify(block Block) error { return nil }
    51  
    52  // Search implements PoW, returning the nonce 0 for any call.
    53  func (pow FakePow) Search(block Block, stop <-chan struct{}) (uint64, []byte) {
    54  	return 0, nil
    55  }
    56  
    57  // Hashrate implements PoW, returning 0.
    58  func (pow FakePow) Hashrate() float64 { return 0 }