github.com/insight-chain/inb-go@v1.1.3-0.20191221022159-da049980ae38/consensus/vdpos/snapContext.go (about)

     1  // Copyright 2019 The inb-go Authors
     2  // This file is part of the inb-go library.
     3  //
     4  // The inb-go 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 MiningReward, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The inb-go 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 inb-go library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  // Package vdpos implements the delegated-proof-of-stake consensus engine.
    18  package vdpos
    19  
    20  import (
    21  	"github.com/insight-chain/inb-go/common"
    22  	"github.com/insight-chain/inb-go/core/state"
    23  	"github.com/insight-chain/inb-go/core/types"
    24  	"github.com/insight-chain/inb-go/params"
    25  	"math/big"
    26  )
    27  
    28  type SnapContext struct {
    29  	config       *params.VdposConfig
    30  	statedb      *state.StateDB
    31  	Number       uint64
    32  	ParentHash   common.Hash
    33  	TimeStamp    int64
    34  	VdposContext *types.VdposContext
    35  	SignersPool  []common.Address
    36  }
    37  
    38  // get last block number meet the confirm condition
    39  func (s *SnapContext) getLastConfirmedBlockNumber() *big.Int {
    40  	i := s.Number
    41  	for ; i > s.Number-s.config.SignerBlocks*(s.config.MaxSignerCount*2/3+1); i-- {
    42  	}
    43  	return big.NewInt(int64(i))
    44  }