/
blocksyn.go
1080 lines (948 loc) · 35.5 KB
/
blocksyn.go
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// Copyright Fuzamei Corp. 2018 All Rights Reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package blockchain
import (
"bytes"
"math/big"
"sort"
"sync"
"sync/atomic"
"time"
"github.com/PhenixChain/devchain/common"
"github.com/PhenixChain/devchain/types"
)
//var
var (
BackBlockNum int64 = 128 //节点高度不增加时向后取blocks的个数
BackwardBlockNum int64 = 16 //本节点高度不增加时并且落后peer的高度数
checkHeightNoIncSeconds int64 = 5 * 60 //高度不增长时的检测周期目前暂定5分钟
checkBlockHashSeconds int64 = 1 * 60 //1分钟检测一次tip hash和peer 对应高度的hash是否一致
fetchPeerListSeconds int64 = 5 //5 秒获取一个peerlist
MaxRollBlockNum int64 = 10000 //最大回退block数量
//TODO
batchsyncblocknum int64 = 5000 //同步阶段,如果自己高度小于最大高度5000个时,saveblock到db时批量处理不刷盘
synlog = chainlog.New("submodule", "syn")
)
//PeerInfo blockchain模块需要保存的peerinfo
type PeerInfo struct {
Name string
ParentHash []byte
Height int64
Hash []byte
}
//PeerInfoList 节点列表
type PeerInfoList []*PeerInfo
//Len 长度
func (list PeerInfoList) Len() int {
return len(list)
}
//Less 小于
func (list PeerInfoList) Less(i, j int) bool {
if list[i].Height < list[j].Height {
return true
} else if list[i].Height > list[j].Height {
return false
} else {
return list[i].Name < list[j].Name
}
}
//Swap 交换
func (list PeerInfoList) Swap(i, j int) {
temp := list[i]
list[i] = list[j]
list[j] = temp
}
//FaultPeerInfo 可疑故障节点信息
type FaultPeerInfo struct {
Peer *PeerInfo
FaultHeight int64
FaultHash []byte
ErrInfo error
ReqFlag bool
}
//BestPeerInfo 用于记录最优链的信息
type BestPeerInfo struct {
Peer *PeerInfo
Height int64
Hash []byte
Td *big.Int
ReqFlag bool
IsBestChain bool
}
//记录最新区块上链的时间,长时间没有更新需要做对应的超时处理
//主要是处理联盟链区块高度相差一个区块
//整个网络长时间不出块时需要主动去获取最新的区块
type BlockOnChain struct {
sync.RWMutex
Height int64
OnChainTime int64
}
//initOnChainTimeout 初始化
func (chain *BlockChain) initOnChainTimeout() {
chain.blockOnChain.Lock()
defer chain.blockOnChain.Unlock()
chain.blockOnChain.Height = -1
chain.blockOnChain.OnChainTime = types.Now().Unix()
}
//onChainTimeout 最新区块长时间没有更新并超过设置的超时时间
func (chain *BlockChain) OnChainTimeout(height int64) bool {
chain.blockOnChain.Lock()
defer chain.blockOnChain.Unlock()
if chain.onChainTimeout == 0 {
return false
}
curTime := types.Now().Unix()
if chain.blockOnChain.Height != height {
chain.blockOnChain.Height = height
chain.blockOnChain.OnChainTime = curTime
return false
}
if curTime-chain.blockOnChain.OnChainTime > chain.onChainTimeout {
synlog.Debug("OnChainTimeout", "curTime", curTime, "blockOnChain", chain.blockOnChain)
return true
}
return false
}
//SynRoutine 同步事务
func (chain *BlockChain) SynRoutine() {
//获取peerlist的定时器,默认1分钟
fetchPeerListTicker := time.NewTicker(time.Duration(fetchPeerListSeconds) * time.Second)
//向peer请求同步block的定时器,默认2s
blockSynTicker := time.NewTicker(chain.blockSynInterVal * time.Second)
//5分钟检测一次bestchain主链高度是否有增长,如果没有增长可能是目前主链在侧链上,
//需要从最高peer向后同步指定的headers用来获取分叉点,再后从指定peer获取分叉点以后的blocks
checkHeightNoIncreaseTicker := time.NewTicker(time.Duration(checkHeightNoIncSeconds) * time.Second)
//目前暂定1分钟检测一次本bestchain的tiphash和最高peer的对应高度的blockshash是否一致。
//如果不一致可能两个节点在各自的链上挖矿,需要从peer的对应高度向后获取指定数量的headers寻找分叉点
//考虑叉后的第一个block没有广播到本节点,导致接下来广播过来的blocks都是孤儿节点,无法进行主侧链总难度对比
checkBlockHashTicker := time.NewTicker(time.Duration(checkBlockHashSeconds) * time.Second)
//5分钟检测一次系统时间,不同步提示告警
checkClockDriftTicker := time.NewTicker(300 * time.Second)
//3分钟尝试检测一次故障peer是否已经恢复
recoveryFaultPeerTicker := time.NewTicker(180 * time.Second)
//2分钟尝试检测一次最优链,确保本节点在最优链
checkBestChainTicker := time.NewTicker(120 * time.Second)
//节点启动后首先尝试开启快速下载模式,目前默认开启
if chain.GetDownloadSyncStatus() {
go chain.FastDownLoadBlocks()
}
for {
select {
case <-chain.quit:
//synlog.Info("quit SynRoutine!")
return
case <-blockSynTicker.C:
//synlog.Info("blockSynTicker")
if !chain.GetDownloadSyncStatus() {
go chain.SynBlocksFromPeers()
}
case <-fetchPeerListTicker.C:
//synlog.Info("blockUpdateTicker")
chain.tickerwg.Add(1)
go chain.FetchPeerList()
case <-checkHeightNoIncreaseTicker.C:
//synlog.Info("CheckHeightNoIncrease")
chain.tickerwg.Add(1)
go chain.CheckHeightNoIncrease()
case <-checkBlockHashTicker.C:
//synlog.Info("checkBlockHashTicker")
chain.tickerwg.Add(1)
go chain.CheckTipBlockHash()
//定时检查系统时间,如果系统时间有问题,那么会有一个报警
case <-checkClockDriftTicker.C:
// ntp可能存在一直没有回应的情况导致go线程不退出,暂时不在WaitGroup中处理
go chain.checkClockDrift()
//定时检查故障peer,如果执行出错高度的blockhash值有变化,说明故障peer已经纠正
case <-recoveryFaultPeerTicker.C:
chain.tickerwg.Add(1)
go chain.RecoveryFaultPeer()
//定时检查peerlist中的节点是否在同一条链上,获取同一高度的blockhash来做对比
case <-checkBestChainTicker.C:
chain.tickerwg.Add(1)
go chain.CheckBestChain(false)
}
}
}
/*
FetchBlock 函数功能:
通过向P2P模块送 EventFetchBlock(types.RequestGetBlock),向其他节点主动请求区块,
P2P区块收到这个消息后,会向blockchain 模块回复, EventReply。
其他节点如果有这个范围的区块,P2P模块收到其他节点发来的数据,
会发送送EventAddBlocks(types.Blocks) 给 blockchain 模块,
blockchain 模块回复 EventReply
syncOrfork:true fork分叉处理,不需要处理请求block的个数
:fasle 区块同步处理,一次请求128个block
*/
func (chain *BlockChain) FetchBlock(start int64, end int64, pid []string, syncOrfork bool) (err error) {
if chain.client == nil {
synlog.Error("FetchBlock chain client not bind message queue.")
return types.ErrClientNotBindQueue
}
synlog.Debug("FetchBlock input", "StartHeight", start, "EndHeight", end, "pid", pid)
blockcount := end - start
if blockcount < 0 {
return types.ErrStartBigThanEnd
}
var requestblock types.ReqBlocks
requestblock.Start = start
requestblock.IsDetail = false
requestblock.Pid = pid
//同步block一次请求128个
if blockcount >= chain.MaxFetchBlockNum {
requestblock.End = start + chain.MaxFetchBlockNum - 1
} else {
requestblock.End = end
}
var cb func()
var timeoutcb func(height int64)
if syncOrfork {
//还有区块需要请求,挂接钩子回调函数
if requestblock.End < chain.downLoadInfo.EndHeight {
cb = func() {
chain.ReqDownLoadBlocks()
}
timeoutcb = func(height int64) {
chain.DownLoadTimeOutProc(height)
}
chain.UpdateDownLoadStartHeight(requestblock.End + 1)
//快速下载时需要及时更新bestpeer,防止下载侧链的block
if chain.GetDownloadSyncStatus() {
chain.UpdateDownLoadPids()
}
} else { // 所有DownLoad block已请求结束,恢复DownLoadInfo为默认值
chain.DefaultDownLoadInfo()
}
err = chain.downLoadTask.Start(requestblock.Start, requestblock.End, cb, timeoutcb)
if err != nil {
return err
}
} else {
if chain.GetPeerMaxBlkHeight()-requestblock.End > BackBlockNum {
cb = func() {
chain.SynBlocksFromPeers()
}
}
err = chain.syncTask.Start(requestblock.Start, requestblock.End, cb, timeoutcb)
if err != nil {
return err
}
}
synlog.Info("FetchBlock", "Start", requestblock.Start, "End", requestblock.End)
msg := chain.client.NewMessage("p2p", types.EventFetchBlocks, &requestblock)
Err := chain.client.Send(msg, true)
if Err != nil {
synlog.Error("FetchBlock", "client.Send err:", Err)
return err
}
resp, err := chain.client.Wait(msg)
if err != nil {
synlog.Error("FetchBlock", "client.Wait err:", err)
return err
}
return resp.Err()
}
//FetchPeerList 从p2p模块获取peerlist,用于获取active链上最新的高度。
//如果没有收到广播block就主动向p2p模块发送请求
func (chain *BlockChain) FetchPeerList() {
defer chain.tickerwg.Done()
err := chain.fetchPeerList()
if err != nil {
synlog.Error("FetchPeerList.", "err", err)
}
}
func (chain *BlockChain) fetchPeerList() error {
if chain.client == nil {
synlog.Error("fetchPeerList chain client not bind message queue.")
return nil
}
msg := chain.client.NewMessage("p2p", types.EventPeerInfo, nil)
Err := chain.client.SendTimeout(msg, true, 30*time.Second)
if Err != nil {
synlog.Error("fetchPeerList", "client.Send err:", Err)
return Err
}
resp, err := chain.client.WaitTimeout(msg, 60*time.Second)
if err != nil {
synlog.Error("fetchPeerList", "client.Wait err:", err)
return err
}
peerlist := resp.GetData().(*types.PeerList)
if peerlist == nil {
synlog.Error("fetchPeerList", "peerlist", "is nil")
return types.ErrNoPeer
}
curheigt := chain.GetBlockHeight()
var peerInfoList PeerInfoList
for _, peer := range peerlist.Peers {
//chainlog.Info("fetchPeerList", "peername:", peer.Name, "peerHeight:", peer.Header.Height)
//过滤掉自己和小于自己5个高度的节点
if peer.Self || curheigt > peer.Header.Height+5 {
continue
}
var peerInfo PeerInfo
peerInfo.Name = peer.Name
peerInfo.ParentHash = peer.Header.ParentHash
peerInfo.Height = peer.Header.Height
peerInfo.Hash = peer.Header.Hash
peerInfoList = append(peerInfoList, &peerInfo)
}
//peerlist中没有比自己节点高的就不做处理直接返回
if len(peerInfoList) == 0 {
return nil
}
//按照height给peer排序从小到大
sort.Sort(peerInfoList)
subInfoList := peerInfoList
chain.peerMaxBlklock.Lock()
chain.peerList = subInfoList
chain.peerMaxBlklock.Unlock()
//获取到peerlist之后,需要判断是否已经发起了最优链的检测。如果没有就触发一次最优链的检测
if atomic.LoadInt32(&chain.firstcheckbestchain) == 0 {
synlog.Info("fetchPeerList trigger first CheckBestChain")
chain.CheckBestChain(true)
}
return nil
}
//GetRcvLastCastBlkHeight 存储广播的block最新高度
func (chain *BlockChain) GetRcvLastCastBlkHeight() int64 {
chain.castlock.Lock()
defer chain.castlock.Unlock()
return chain.rcvLastBlockHeight
}
//UpdateRcvCastBlkHeight 更新广播的block最新高度
func (chain *BlockChain) UpdateRcvCastBlkHeight(height int64) {
chain.castlock.Lock()
defer chain.castlock.Unlock()
chain.rcvLastBlockHeight = height
}
//GetsynBlkHeight 存储已经同步到db的block高度
func (chain *BlockChain) GetsynBlkHeight() int64 {
chain.synBlocklock.Lock()
defer chain.synBlocklock.Unlock()
return chain.synBlockHeight
}
//UpdatesynBlkHeight 更新已经同步到db的block高度
func (chain *BlockChain) UpdatesynBlkHeight(height int64) {
chain.synBlocklock.Lock()
defer chain.synBlocklock.Unlock()
chain.synBlockHeight = height
}
//GetPeerMaxBlkHeight 获取peerlist中合法的最新block高度
func (chain *BlockChain) GetPeerMaxBlkHeight() int64 {
chain.peerMaxBlklock.Lock()
defer chain.peerMaxBlklock.Unlock()
//获取peerlist中最高的高度,peerlist是已经按照高度排序了的。
if chain.peerList != nil {
peerlen := len(chain.peerList)
for i := peerlen - 1; i >= 0; i-- {
if chain.peerList[i] != nil {
ok := chain.IsFaultPeer(chain.peerList[i].Name)
if !ok {
return chain.peerList[i].Height
}
}
}
//没有合法的peer,此时本节点可能在侧链上,返回peerlist中最高的peer尝试矫正
maxpeer := chain.peerList[peerlen-1]
if maxpeer != nil {
synlog.Debug("GetPeerMaxBlkHeight all peers are faultpeer maybe self on Side chain", "pid", maxpeer.Name, "Height", maxpeer.Height, "Hash", common.ToHex(maxpeer.Hash))
return maxpeer.Height
}
}
return -1
}
//GetPeerInfo 通过peerid获取peerinfo
func (chain *BlockChain) GetPeerInfo(pid string) *PeerInfo {
chain.peerMaxBlklock.Lock()
defer chain.peerMaxBlklock.Unlock()
//获取peerinfo
if chain.peerList != nil {
for _, peer := range chain.peerList {
if pid == peer.Name {
return peer
}
}
}
return nil
}
//GetMaxPeerInfo 获取peerlist中最高节点的peerinfo
func (chain *BlockChain) GetMaxPeerInfo() *PeerInfo {
chain.peerMaxBlklock.Lock()
defer chain.peerMaxBlklock.Unlock()
//获取peerlist中高度最高的peer,peerlist是已经按照高度排序了的。
if chain.peerList != nil {
peerlen := len(chain.peerList)
for i := peerlen - 1; i >= 0; i-- {
if chain.peerList[i] != nil {
ok := chain.IsFaultPeer(chain.peerList[i].Name)
if !ok {
return chain.peerList[i]
}
}
}
//没有合法的peer,此时本节点可能在侧链上,返回peerlist中最高的peer尝试矫正
maxpeer := chain.peerList[peerlen-1]
if maxpeer != nil {
synlog.Debug("GetMaxPeerInfo all peers are faultpeer maybe self on Side chain", "pid", maxpeer.Name, "Height", maxpeer.Height, "Hash", common.ToHex(maxpeer.Hash))
return maxpeer
}
}
return nil
}
//GetPeers 获取所有peers
func (chain *BlockChain) GetPeers() PeerInfoList {
chain.peerMaxBlklock.Lock()
defer chain.peerMaxBlklock.Unlock()
//获取peerinfo
var peers PeerInfoList
if chain.peerList != nil {
peers = append(peers, chain.peerList...)
}
return peers
}
//GetPeersMap 获取peers的map列表方便查找
func (chain *BlockChain) GetPeersMap() map[string]bool {
chain.peerMaxBlklock.Lock()
defer chain.peerMaxBlklock.Unlock()
peersmap := make(map[string]bool)
if chain.peerList != nil {
for _, peer := range chain.peerList {
peersmap[peer.Name] = true
}
}
return peersmap
}
//IsFaultPeer 判断指定pid是否在故障faultPeerList中
func (chain *BlockChain) IsFaultPeer(pid string) bool {
chain.faultpeerlock.Lock()
defer chain.faultpeerlock.Unlock()
return chain.faultPeerList[pid] != nil
}
//IsErrExecBlock 判断此block是否被记录在本节点执行错误。
func (chain *BlockChain) IsErrExecBlock(height int64, hash []byte) (bool, error) {
chain.faultpeerlock.Lock()
defer chain.faultpeerlock.Unlock()
//循环遍历故障peerlist,尝试检测故障peer是否已经恢复
for _, faultpeer := range chain.faultPeerList {
if faultpeer.FaultHeight == height && bytes.Equal(hash, faultpeer.FaultHash) {
return true, faultpeer.ErrInfo
}
}
return false, nil
}
//GetFaultPeer 获取指定pid是否在故障faultPeerList中
func (chain *BlockChain) GetFaultPeer(pid string) *FaultPeerInfo {
chain.faultpeerlock.Lock()
defer chain.faultpeerlock.Unlock()
return chain.faultPeerList[pid]
}
//RecoveryFaultPeer 尝试恢复故障peer节点,定时从出错的peer获取出错block的头信息。
//看对应的block是否有更新。有更新就说明故障peer节点已经恢复ok
func (chain *BlockChain) RecoveryFaultPeer() {
chain.faultpeerlock.Lock()
defer chain.faultpeerlock.Unlock()
defer chain.tickerwg.Done()
//循环遍历故障peerlist,尝试检测故障peer是否已经恢复
for pid, faultpeer := range chain.faultPeerList {
//需要考虑回退的情况,可能本地节点已经回退,恢复以前的故障节点,获取故障高度的区块的hash是否在本地已经校验通过。校验通过就直接说明故障已经恢复
//获取本节点指定高度的blockhash做判断,hash相同就确认故障已经恢复
blockhash, err := chain.blockStore.GetBlockHashByHeight(faultpeer.FaultHeight)
if err == nil {
if bytes.Equal(faultpeer.FaultHash, blockhash) {
synlog.Debug("RecoveryFaultPeer ", "Height", faultpeer.FaultHeight, "FaultHash", common.ToHex(faultpeer.FaultHash), "pid", pid)
delete(chain.faultPeerList, pid)
continue
}
}
err = chain.FetchBlockHeaders(faultpeer.FaultHeight, faultpeer.FaultHeight, pid)
if err == nil {
chain.faultPeerList[pid].ReqFlag = true
}
synlog.Debug("RecoveryFaultPeer", "pid", faultpeer.Peer.Name, "FaultHeight", faultpeer.FaultHeight, "FaultHash", common.ToHex(faultpeer.FaultHash), "Err", faultpeer.ErrInfo)
}
}
//AddFaultPeer 添加故障节点到故障FaultPeerList中
func (chain *BlockChain) AddFaultPeer(faultpeer *FaultPeerInfo) {
chain.faultpeerlock.Lock()
defer chain.faultpeerlock.Unlock()
//此节点已经存在故障peerlist中打印信息
faultnode := chain.faultPeerList[faultpeer.Peer.Name]
if faultnode != nil {
synlog.Debug("AddFaultPeer old", "pid", faultnode.Peer.Name, "FaultHeight", faultnode.FaultHeight, "FaultHash", common.ToHex(faultnode.FaultHash), "Err", faultnode.ErrInfo)
}
chain.faultPeerList[faultpeer.Peer.Name] = faultpeer
synlog.Debug("AddFaultPeer new", "pid", faultpeer.Peer.Name, "FaultHeight", faultpeer.FaultHeight, "FaultHash", common.ToHex(faultpeer.FaultHash), "Err", faultpeer.ErrInfo)
}
//RemoveFaultPeer 此pid对应的故障已经修复,将此pid从故障列表中移除
func (chain *BlockChain) RemoveFaultPeer(pid string) {
chain.faultpeerlock.Lock()
defer chain.faultpeerlock.Unlock()
synlog.Debug("RemoveFaultPeer", "pid", pid)
delete(chain.faultPeerList, pid)
}
//UpdateFaultPeer 更新此故障peer的请求标志位
func (chain *BlockChain) UpdateFaultPeer(pid string, reqFlag bool) {
chain.faultpeerlock.Lock()
defer chain.faultpeerlock.Unlock()
faultpeer := chain.faultPeerList[pid]
if faultpeer != nil {
faultpeer.ReqFlag = reqFlag
}
}
//RecordFaultPeer 当blcok执行出错时,记录出错block高度,hash值,以及出错信息和对应的peerid
func (chain *BlockChain) RecordFaultPeer(pid string, height int64, hash []byte, err error) {
var faultnode FaultPeerInfo
//通过pid获取peerinfo
peerinfo := chain.GetPeerInfo(pid)
if peerinfo == nil {
synlog.Error("RecordFaultPeerNode GetPeerInfo is nil", "pid", pid)
return
}
faultnode.Peer = peerinfo
faultnode.FaultHeight = height
faultnode.FaultHash = hash
faultnode.ErrInfo = err
faultnode.ReqFlag = false
chain.AddFaultPeer(&faultnode)
}
//PrintFaultPeer 打印出错的节点
func (chain *BlockChain) PrintFaultPeer() {
chain.faultpeerlock.Lock()
defer chain.faultpeerlock.Unlock()
//循环遍历故障peerlist,尝试检测故障peer是否已经恢复
for pid, faultpeer := range chain.faultPeerList {
synlog.Debug("PrintFaultPeer", "pid", pid, "FaultHeight", faultpeer.FaultHeight, "FaultHash", common.ToHex(faultpeer.FaultHash), "Err", faultpeer.ErrInfo)
}
}
//SynBlocksFromPeers blockSynSeconds时间检测一次本节点的height是否有增长,没有增长就需要通过对端peerlist获取最新高度,发起同步
func (chain *BlockChain) SynBlocksFromPeers() {
curheight := chain.GetBlockHeight()
RcvLastCastBlkHeight := chain.GetRcvLastCastBlkHeight()
peerMaxBlkHeight := chain.GetPeerMaxBlkHeight()
// 节点同步阶段自己高度小于最大高度batchsyncblocknum时存储block到db批量处理时不刷盘
if peerMaxBlkHeight > curheight+batchsyncblocknum && !chain.cfgBatchSync {
atomic.CompareAndSwapInt32(&chain.isbatchsync, 1, 0)
} else if peerMaxBlkHeight >= 0 {
atomic.CompareAndSwapInt32(&chain.isbatchsync, 0, 1)
}
//如果任务正常,那么不重复启动任务
if chain.syncTask.InProgress() {
synlog.Info("chain syncTask InProgress")
return
}
//如果此时系统正在处理回滚,不启动同步的任务。
//等分叉回滚处理结束之后再启动同步任务继续同步
if chain.downLoadTask.InProgress() {
synlog.Info("chain downLoadTask InProgress")
return
}
//获取peers的最新高度.处理没有收到广播block的情况
//落后超过2个区块时主动同步区块,落后一个区块时需要判断是否超时
backWardThanTwo := curheight+1 < peerMaxBlkHeight
backWardOne := curheight+1 == peerMaxBlkHeight && chain.OnChainTimeout(curheight)
if backWardThanTwo || backWardOne {
synlog.Info("SynBlocksFromPeers", "curheight", curheight, "LastCastBlkHeight", RcvLastCastBlkHeight, "peerMaxBlkHeight", peerMaxBlkHeight)
pids := chain.GetBestChainPids()
if pids != nil {
err := chain.FetchBlock(curheight+1, peerMaxBlkHeight, pids, false)
if err != nil {
synlog.Error("SynBlocksFromPeers FetchBlock", "err", err)
}
} else {
synlog.Info("SynBlocksFromPeers GetBestChainPids is nil")
}
}
}
//CheckHeightNoIncrease 在规定时间本链的高度没有增长,但peerlist中最新高度远远高于本节点高度,
//可能当前链是在分支链上,需从指定最长链的peer向后请求指定数量的blockheader
//请求bestchain.Height -BackBlockNum -- bestchain.Height的header
//需要考虑收不到分叉之后的第一个广播block,这样就会导致后面的广播block都在孤儿节点中了。
func (chain *BlockChain) CheckHeightNoIncrease() {
defer chain.tickerwg.Done()
//获取当前主链的最新高度
tipheight := chain.bestChain.Height()
laststorheight := chain.blockStore.Height()
if tipheight != laststorheight {
synlog.Error("CheckHeightNoIncrease", "tipheight", tipheight, "laststorheight", laststorheight)
return
}
//获取上个检测周期时的检测高度
checkheight := chain.GetsynBlkHeight()
//bestchain的tip高度在变化,更新最新的检测高度即可,高度可能在增长或者回退
if tipheight != checkheight {
chain.UpdatesynBlkHeight(tipheight)
return
}
//一个检测周期发现本节点bestchain的tip高度没有变化。
//远远落后于高度的peer节点并且最高peer节点不是最优链,本节点可能在侧链上,
//需要从最新的peer上向后取BackBlockNum个headers
maxpeer := chain.GetMaxPeerInfo()
if maxpeer == nil {
synlog.Error("CheckHeightNoIncrease GetMaxPeerInfo is nil")
return
}
peermaxheight := maxpeer.Height
pid := maxpeer.Name
var err error
if peermaxheight > tipheight && (peermaxheight-tipheight) > BackwardBlockNum && !chain.isBestChainPeer(pid) {
//从指定peer向后请求BackBlockNum个blockheaders
synlog.Debug("CheckHeightNoIncrease", "tipheight", tipheight, "pid", pid)
if tipheight > BackBlockNum {
err = chain.FetchBlockHeaders(tipheight-BackBlockNum, tipheight, pid)
} else {
err = chain.FetchBlockHeaders(0, tipheight, pid)
}
if err != nil {
synlog.Error("CheckHeightNoIncrease FetchBlockHeaders", "err", err)
}
}
}
//FetchBlockHeaders 从指定pid获取start到end之间的headers
func (chain *BlockChain) FetchBlockHeaders(start int64, end int64, pid string) (err error) {
if chain.client == nil {
synlog.Error("FetchBlockHeaders chain client not bind message queue.")
return types.ErrClientNotBindQueue
}
chainlog.Debug("FetchBlockHeaders", "StartHeight", start, "EndHeight", end, "pid", pid)
var requestblock types.ReqBlocks
requestblock.Start = start
requestblock.End = end
requestblock.IsDetail = false
requestblock.Pid = []string{pid}
msg := chain.client.NewMessage("p2p", types.EventFetchBlockHeaders, &requestblock)
Err := chain.client.Send(msg, true)
if Err != nil {
synlog.Error("FetchBlockHeaders", "client.Send err:", Err)
return err
}
resp, err := chain.client.Wait(msg)
if err != nil {
synlog.Error("FetchBlockHeaders", "client.Wait err:", err)
return err
}
return resp.Err()
}
//ProcBlockHeader 一个block header消息的处理,分tiphash的校验,故障peer的故障block是否恢复的校验
func (chain *BlockChain) ProcBlockHeader(headers *types.Headers, peerid string) error {
//判断是否是用于检测故障peer而请求的block header
faultPeer := chain.GetFaultPeer(peerid)
if faultPeer != nil && faultPeer.ReqFlag && faultPeer.FaultHeight == headers.Items[0].Height {
//同一高度的block hash有更新,表示故障peer的故障已经恢复,将此peer从故障peerlist中移除
if !bytes.Equal(headers.Items[0].Hash, faultPeer.FaultHash) {
chain.RemoveFaultPeer(peerid)
} else {
chain.UpdateFaultPeer(peerid, false)
}
return nil
}
//检测最优链的处理
bestchainPeer := chain.GetBestChainPeer(peerid)
if bestchainPeer != nil && bestchainPeer.ReqFlag && headers.Items[0].Height == bestchainPeer.Height {
chain.CheckBestChainProc(headers, peerid)
return nil
}
// 用于tiphash对比而请求的block header
height := headers.Items[0].Height
//获取height高度在本节点的headers信息
header, err := chain.blockStore.GetBlockHeaderByHeight(height)
if err != nil {
return err
}
//对应高度hash不相等就向后寻找分叉点
if !bytes.Equal(headers.Items[0].Hash, header.Hash) {
synlog.Info("ProcBlockHeader hash no equal", "height", height, "self hash", common.ToHex(header.Hash), "peer hash", common.ToHex(headers.Items[0].Hash))
if height > BackBlockNum {
err = chain.FetchBlockHeaders(height-BackBlockNum, height, peerid)
} else if height != 0 {
err = chain.FetchBlockHeaders(0, height, peerid)
}
if err != nil {
synlog.Info("ProcBlockHeader FetchBlockHeaders", "err", err)
}
}
return nil
}
//ProcBlockHeaders 多个headers消息的处理,主要用于寻找分叉节点
func (chain *BlockChain) ProcBlockHeaders(headers *types.Headers, pid string) error {
var ForkHeight int64 = -1
var forkhash []byte
var err error
count := len(headers.Items)
tipheight := chain.bestChain.Height()
//循环找到分叉点
for i := count - 1; i >= 0; i-- {
exists := chain.bestChain.HaveBlock(headers.Items[i].Hash, headers.Items[i].Height)
if exists {
ForkHeight = headers.Items[i].Height
forkhash = headers.Items[i].Hash
break
}
}
if ForkHeight == -1 {
synlog.Error("ProcBlockHeaders do not find fork point ")
synlog.Error("ProcBlockHeaders start headerinfo", "height", headers.Items[0].Height, "hash", common.ToHex(headers.Items[0].Hash))
synlog.Error("ProcBlockHeaders end headerinfo", "height", headers.Items[count-1].Height, "hash", common.ToHex(headers.Items[count-1].Hash))
//回退5000个block之后不再回退了,直接返回错误
startheight := headers.Items[0].Height
if tipheight > startheight && (tipheight-startheight) > MaxRollBlockNum {
synlog.Error("ProcBlockHeaders Not Roll Back!", "selfheight", tipheight, "RollBackedhieght", startheight)
return types.ErrNotRollBack
}
//继续向后取指定数量的headers
height := headers.Items[0].Height
if height > BackBlockNum {
err = chain.FetchBlockHeaders(height-BackBlockNum, height, pid)
} else {
err = chain.FetchBlockHeaders(0, height, pid)
}
if err != nil {
synlog.Info("ProcBlockHeaders FetchBlockHeaders", "err", err)
}
return types.ErrContinueBack
}
synlog.Info("ProcBlockHeaders find fork point", "height", ForkHeight, "hash", common.ToHex(forkhash))
//获取此pid对应的peer信息,
peerinfo := chain.GetPeerInfo(pid)
if peerinfo == nil {
synlog.Error("ProcBlockHeaders GetPeerInfo is nil", "pid", pid)
return types.ErrPeerInfoIsNil
}
//从分叉节点高度继续请求block,从pid
peermaxheight := peerinfo.Height
//启动一个线程在后台获取分叉的blcok
if chain.downLoadTask.InProgress() {
synlog.Info("ProcBlockHeaders downLoadTask.InProgress")
return nil
}
//在快速下载block阶段不处理fork的处理
//如果在普通同步阶段出现了分叉
//需要暂定同步解决分叉回滚之后再继续开启普通同步
if !chain.GetDownloadSyncStatus() {
if chain.syncTask.InProgress() {
err = chain.syncTask.Cancel()
synlog.Info("ProcBlockHeaders: cancel syncTask start fork process downLoadTask!", "err", err)
}
go chain.ProcDownLoadBlocks(ForkHeight, peermaxheight, []string{pid})
}
return nil
}
//ProcAddBlockHeadersMsg 处理从peer获取的headers消息
func (chain *BlockChain) ProcAddBlockHeadersMsg(headers *types.Headers, pid string) error {
if headers == nil {
return types.ErrInvalidParam
}
count := len(headers.Items)
synlog.Debug("ProcAddBlockHeadersMsg", "count", count, "pid", pid)
if count == 1 {
return chain.ProcBlockHeader(headers, pid)
}
return chain.ProcBlockHeaders(headers, pid)
}
//CheckTipBlockHash 在规定时间本链的高度没有增长,但peerlist中最新高度远远高于本节点高度,
//可能当前链是在分支链上,需从指定最长链的peer向后请求指定数量的blockheader
//请求bestchain.Height -BackBlockNum -- bestchain.Height的header
//需要考虑收不到分叉之后的第一个广播block,这样就会导致后面的广播block都在孤儿节点中了。
func (chain *BlockChain) CheckTipBlockHash() {
synlog.Debug("CheckTipBlockHash")
defer chain.tickerwg.Done()
//获取当前主链的高度
tipheight := chain.bestChain.Height()
tiphash := chain.bestChain.Tip().hash
laststorheight := chain.blockStore.Height()
if tipheight != laststorheight {
synlog.Error("CheckTipBlockHash", "tipheight", tipheight, "laststorheight", laststorheight)
return
}
maxpeer := chain.GetMaxPeerInfo()
if maxpeer == nil {
synlog.Error("CheckTipBlockHash GetMaxPeerInfo is nil")
return
}
peermaxheight := maxpeer.Height
pid := maxpeer.Name
peerhash := maxpeer.Hash
var Err error
//和最高的peer做tip block hash的校验
if peermaxheight > tipheight {
//从指定peer 请求BackBlockNum个blockheaders
synlog.Debug("CheckTipBlockHash >", "peermaxheight", peermaxheight, "tipheight", tipheight)
Err = chain.FetchBlockHeaders(tipheight, tipheight, pid)
} else if peermaxheight == tipheight {
// 直接tip block hash比较,如果不相等需要从peer向后去指定的headers,尝试寻找分叉点
if !bytes.Equal(tiphash, peerhash) {
if tipheight > BackBlockNum {
synlog.Debug("CheckTipBlockHash ==", "peermaxheight", peermaxheight, "tipheight", tipheight)
Err = chain.FetchBlockHeaders(tipheight-BackBlockNum, tipheight, pid)
} else {
synlog.Debug("CheckTipBlockHash !=", "peermaxheight", peermaxheight, "tipheight", tipheight)
Err = chain.FetchBlockHeaders(1, tipheight, pid)
}
}
} else {
header, err := chain.blockStore.GetBlockHeaderByHeight(peermaxheight)
if err != nil {
return
}
if !bytes.Equal(header.Hash, peerhash) {
if peermaxheight > BackBlockNum {
synlog.Debug("CheckTipBlockHash<!=", "peermaxheight", peermaxheight, "tipheight", tipheight)
Err = chain.FetchBlockHeaders(peermaxheight-BackBlockNum, peermaxheight, pid)
} else {
synlog.Debug("CheckTipBlockHash<!=", "peermaxheight", peermaxheight, "tipheight", tipheight)
Err = chain.FetchBlockHeaders(1, peermaxheight, pid)
}
}
}
if Err != nil {
synlog.Error("CheckTipBlockHash FetchBlockHeaders", "err", Err)
}
}
//IsCaughtUp 本节点是否已经追赶上主链高度,追赶上之后通知本节点的共识模块开始挖矿
func (chain *BlockChain) IsCaughtUp() bool {
height := chain.GetBlockHeight()
//peerMaxBlklock.Lock()
//defer peerMaxBlklock.Unlock()
peers := chain.GetPeers()
// peer中只有自己节点,没有其他节点
if peers == nil {
synlog.Debug("IsCaughtUp has no peers")
return chain.cfg.SingleMode
}
var maxPeerHeight int64 = -1
peersNo := 0
for _, peer := range peers {
if peer != nil && maxPeerHeight < peer.Height {
ok := chain.IsFaultPeer(peer.Name)
if !ok {
maxPeerHeight = peer.Height
}
}
peersNo++
}
isCaughtUp := (height > 0 || types.Since(chain.startTime) > 60*time.Second) && (maxPeerHeight == 0 || (height >= maxPeerHeight && maxPeerHeight != -1))
synlog.Debug("IsCaughtUp", "IsCaughtUp ", isCaughtUp, "height", height, "maxPeerHeight", maxPeerHeight, "peersNo", peersNo)
return isCaughtUp
}
//GetNtpClockSyncStatus 获取ntp时间是否同步状态
func (chain *BlockChain) GetNtpClockSyncStatus() bool {
chain.ntpClockSynclock.Lock()
defer chain.ntpClockSynclock.Unlock()
return chain.isNtpClockSync
}
//UpdateNtpClockSyncStatus 定时更新ntp时间同步状态
func (chain *BlockChain) UpdateNtpClockSyncStatus(Sync bool) {
chain.ntpClockSynclock.Lock()
defer chain.ntpClockSynclock.Unlock()
chain.isNtpClockSync = Sync
}
//CheckBestChain 定时确保本节点在最优链上,定时向peer请求指定高度的header
func (chain *BlockChain) CheckBestChain(isFirst bool) {
if !isFirst {
defer chain.tickerwg.Done()
}
peers := chain.GetPeers()
// peer中只有自己节点,没有其他节点
if peers == nil {
synlog.Debug("CheckBestChain has no peers")
return
}
//设置首次检测最优链的标志
atomic.CompareAndSwapInt32(&chain.firstcheckbestchain, 0, 1)
tipheight := chain.bestChain.Height()
chain.bestpeerlock.Lock()
defer chain.bestpeerlock.Unlock()
for _, peer := range peers {
bestpeer := chain.bestChainPeerList[peer.Name]
if bestpeer != nil {
bestpeer.Peer = peer
bestpeer.Height = tipheight
bestpeer.Hash = nil
bestpeer.Td = nil
bestpeer.ReqFlag = true
} else {
if peer.Height < tipheight {
continue
}
var newbestpeer BestPeerInfo
newbestpeer.Peer = peer
newbestpeer.Height = tipheight
newbestpeer.Hash = nil
newbestpeer.Td = nil
newbestpeer.ReqFlag = true
newbestpeer.IsBestChain = false
chain.bestChainPeerList[peer.Name] = &newbestpeer
}
synlog.Debug("CheckBestChain FetchBlockHeaders", "height", tipheight, "pid", peer.Name)