/
server.go
393 lines (344 loc) · 10.4 KB
/
server.go
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//此源码被清华学神尹成大魔王专业翻译分析并修改
//尹成QQ77025077
//尹成微信18510341407
//尹成所在QQ群721929980
//尹成邮箱 yinc13@mails.tsinghua.edu.cn
//尹成毕业于清华大学,微软区块链领域全球最有价值专家
//https://mvp.microsoft.com/zh-cn/PublicProfile/4033620
//版权所有2016 Go Ethereum作者
//此文件是Go以太坊库的一部分。
//
//Go-Ethereum库是免费软件:您可以重新分发它和/或修改
//根据GNU发布的较低通用公共许可证的条款
//自由软件基金会,或者许可证的第3版,或者
//(由您选择)任何更高版本。
//
//Go以太坊图书馆的发行目的是希望它会有用,
//但没有任何保证;甚至没有
//适销性或特定用途的适用性。见
//GNU较低的通用公共许可证,了解更多详细信息。
//
//你应该收到一份GNU较低级别的公共许可证副本
//以及Go以太坊图书馆。如果没有,请参见<http://www.gnu.org/licenses/>。
//包les实现轻以太坊子协议。
package les
import (
"crypto/ecdsa"
"encoding/binary"
"math"
"sync"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/eth"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/les/flowcontrol"
"github.com/ethereum/go-ethereum/light"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/p2p/discv5"
"github.com/ethereum/go-ethereum/rlp"
)
type LesServer struct {
lesCommons
fcManager *flowcontrol.ClientManager //如果我们的节点只是客户端,则为零
fcCostStats *requestCostStats
defParams *flowcontrol.ServerParams
lesTopics []discv5.Topic
privateKey *ecdsa.PrivateKey
quitSync chan struct{}
}
func NewLesServer(eth *eth.Ethereum, config *eth.Config) (*LesServer, error) {
quitSync := make(chan struct{})
pm, err := NewProtocolManager(eth.BlockChain().Config(), false, config.NetworkId, eth.EventMux(), eth.Engine(), newPeerSet(), eth.BlockChain(), eth.TxPool(), eth.ChainDb(), nil, nil, nil, quitSync, new(sync.WaitGroup))
if err != nil {
return nil, err
}
lesTopics := make([]discv5.Topic, len(AdvertiseProtocolVersions))
for i, pv := range AdvertiseProtocolVersions {
lesTopics[i] = lesTopic(eth.BlockChain().Genesis().Hash(), pv)
}
srv := &LesServer{
lesCommons: lesCommons{
config: config,
chainDb: eth.ChainDb(),
chtIndexer: light.NewChtIndexer(eth.ChainDb(), false, nil),
bloomTrieIndexer: light.NewBloomTrieIndexer(eth.ChainDb(), false, nil),
protocolManager: pm,
},
quitSync: quitSync,
lesTopics: lesTopics,
}
logger := log.New()
chtV1SectionCount, _, _ := srv.chtIndexer.Sections() //索引器仍然使用LES/14K节大小来向后兼容服务器
chtV2SectionCount := chtV1SectionCount / (light.CHTFrequencyClient / light.CHTFrequencyServer)
if chtV2SectionCount != 0 {
//转换为LES/2节
chtLastSection := chtV2SectionCount - 1
//将chindexer.sectionhead的最后一个les/2节索引转换回les/1索引
chtLastSectionV1 := (chtLastSection+1)*(light.CHTFrequencyClient/light.CHTFrequencyServer) - 1
chtSectionHead := srv.chtIndexer.SectionHead(chtLastSectionV1)
chtRoot := light.GetChtV2Root(pm.chainDb, chtLastSection, chtSectionHead)
logger.Info("Loaded CHT", "section", chtLastSection, "head", chtSectionHead, "root", chtRoot)
}
bloomTrieSectionCount, _, _ := srv.bloomTrieIndexer.Sections()
if bloomTrieSectionCount != 0 {
bloomTrieLastSection := bloomTrieSectionCount - 1
bloomTrieSectionHead := srv.bloomTrieIndexer.SectionHead(bloomTrieLastSection)
bloomTrieRoot := light.GetBloomTrieRoot(pm.chainDb, bloomTrieLastSection, bloomTrieSectionHead)
logger.Info("Loaded bloom trie", "section", bloomTrieLastSection, "head", bloomTrieSectionHead, "root", bloomTrieRoot)
}
srv.chtIndexer.Start(eth.BlockChain())
pm.server = srv
srv.defParams = &flowcontrol.ServerParams{
BufLimit: 300000000,
MinRecharge: 50000,
}
srv.fcManager = flowcontrol.NewClientManager(uint64(config.LightServ), 10, 1000000000)
srv.fcCostStats = newCostStats(eth.ChainDb())
return srv, nil
}
func (s *LesServer) Protocols() []p2p.Protocol {
return s.makeProtocols(ServerProtocolVersions)
}
//启动启动LES服务器
func (s *LesServer) Start(srvr *p2p.Server) {
s.protocolManager.Start(s.config.LightPeers)
if srvr.DiscV5 != nil {
for _, topic := range s.lesTopics {
topic := topic
go func() {
logger := log.New("topic", topic)
logger.Info("Starting topic registration")
defer logger.Info("Terminated topic registration")
srvr.DiscV5.RegisterTopic(topic, s.quitSync)
}()
}
}
s.privateKey = srvr.PrivateKey
s.protocolManager.blockLoop()
}
func (s *LesServer) SetBloomBitsIndexer(bloomIndexer *core.ChainIndexer) {
bloomIndexer.AddChildIndexer(s.bloomTrieIndexer)
}
//停止停止LES服务
func (s *LesServer) Stop() {
s.chtIndexer.Close()
//Bloom Trie索引器由父BloomBits索引器关闭
s.fcCostStats.store()
s.fcManager.Stop()
go func() {
<-s.protocolManager.noMorePeers
}()
s.protocolManager.Stop()
}
type requestCosts struct {
baseCost, reqCost uint64
}
type requestCostTable map[uint64]*requestCosts
type RequestCostList []struct {
MsgCode, BaseCost, ReqCost uint64
}
func (list RequestCostList) decode() requestCostTable {
table := make(requestCostTable)
for _, e := range list {
table[e.MsgCode] = &requestCosts{
baseCost: e.BaseCost,
reqCost: e.ReqCost,
}
}
return table
}
type linReg struct {
sumX, sumY, sumXX, sumXY float64
cnt uint64
}
const linRegMaxCnt = 100000
func (l *linReg) add(x, y float64) {
if l.cnt >= linRegMaxCnt {
sub := float64(l.cnt+1-linRegMaxCnt) / linRegMaxCnt
l.sumX -= l.sumX * sub
l.sumY -= l.sumY * sub
l.sumXX -= l.sumXX * sub
l.sumXY -= l.sumXY * sub
l.cnt = linRegMaxCnt - 1
}
l.cnt++
l.sumX += x
l.sumY += y
l.sumXX += x * x
l.sumXY += x * y
}
func (l *linReg) calc() (b, m float64) {
if l.cnt == 0 {
return 0, 0
}
cnt := float64(l.cnt)
d := cnt*l.sumXX - l.sumX*l.sumX
if d < 0.001 {
return l.sumY / cnt, 0
}
m = (cnt*l.sumXY - l.sumX*l.sumY) / d
b = (l.sumY / cnt) - (m * l.sumX / cnt)
return b, m
}
func (l *linReg) toBytes() []byte {
var arr [40]byte
binary.BigEndian.PutUint64(arr[0:8], math.Float64bits(l.sumX))
binary.BigEndian.PutUint64(arr[8:16], math.Float64bits(l.sumY))
binary.BigEndian.PutUint64(arr[16:24], math.Float64bits(l.sumXX))
binary.BigEndian.PutUint64(arr[24:32], math.Float64bits(l.sumXY))
binary.BigEndian.PutUint64(arr[32:40], l.cnt)
return arr[:]
}
func linRegFromBytes(data []byte) *linReg {
if len(data) != 40 {
return nil
}
l := &linReg{}
l.sumX = math.Float64frombits(binary.BigEndian.Uint64(data[0:8]))
l.sumY = math.Float64frombits(binary.BigEndian.Uint64(data[8:16]))
l.sumXX = math.Float64frombits(binary.BigEndian.Uint64(data[16:24]))
l.sumXY = math.Float64frombits(binary.BigEndian.Uint64(data[24:32]))
l.cnt = binary.BigEndian.Uint64(data[32:40])
return l
}
type requestCostStats struct {
lock sync.RWMutex
db ethdb.Database
stats map[uint64]*linReg
}
type requestCostStatsRlp []struct {
MsgCode uint64
Data []byte
}
var rcStatsKey = []byte("_requestCostStats")
func newCostStats(db ethdb.Database) *requestCostStats {
stats := make(map[uint64]*linReg)
for _, code := range reqList {
stats[code] = &linReg{cnt: 100}
}
if db != nil {
data, err := db.Get(rcStatsKey)
var statsRlp requestCostStatsRlp
if err == nil {
err = rlp.DecodeBytes(data, &statsRlp)
}
if err == nil {
for _, r := range statsRlp {
if stats[r.MsgCode] != nil {
if l := linRegFromBytes(r.Data); l != nil {
stats[r.MsgCode] = l
}
}
}
}
}
return &requestCostStats{
db: db,
stats: stats,
}
}
func (s *requestCostStats) store() {
s.lock.Lock()
defer s.lock.Unlock()
statsRlp := make(requestCostStatsRlp, len(reqList))
for i, code := range reqList {
statsRlp[i].MsgCode = code
statsRlp[i].Data = s.stats[code].toBytes()
}
if data, err := rlp.EncodeToBytes(statsRlp); err == nil {
s.db.Put(rcStatsKey, data)
}
}
func (s *requestCostStats) getCurrentList() RequestCostList {
s.lock.Lock()
defer s.lock.Unlock()
list := make(RequestCostList, len(reqList))
//fmt.println(“请求成本列表”)
for idx, code := range reqList {
b, m := s.stats[code].calc()
//fmt.println(code,s.stats[code].cnt,b/1000000,m/1000000)
if m < 0 {
b += m
m = 0
}
if b < 0 {
b = 0
}
list[idx].MsgCode = code
list[idx].BaseCost = uint64(b * 2)
list[idx].ReqCost = uint64(m * 2)
}
return list
}
func (s *requestCostStats) update(msgCode, reqCnt, cost uint64) {
s.lock.Lock()
defer s.lock.Unlock()
c, ok := s.stats[msgCode]
if !ok || reqCnt == 0 {
return
}
c.add(float64(reqCnt), float64(cost))
}
func (pm *ProtocolManager) blockLoop() {
pm.wg.Add(1)
headCh := make(chan core.ChainHeadEvent, 10)
headSub := pm.blockchain.SubscribeChainHeadEvent(headCh)
go func() {
var lastHead *types.Header
lastBroadcastTd := common.Big0
for {
select {
case ev := <-headCh:
peers := pm.peers.AllPeers()
if len(peers) > 0 {
header := ev.Block.Header()
hash := header.Hash()
number := header.Number.Uint64()
td := rawdb.ReadTd(pm.chainDb, hash, number)
if td != nil && td.Cmp(lastBroadcastTd) > 0 {
var reorg uint64
if lastHead != nil {
reorg = lastHead.Number.Uint64() - rawdb.FindCommonAncestor(pm.chainDb, header, lastHead).Number.Uint64()
}
lastHead = header
lastBroadcastTd = td
log.Debug("Announcing block to peers", "number", number, "hash", hash, "td", td, "reorg", reorg)
announce := announceData{Hash: hash, Number: number, Td: td, ReorgDepth: reorg}
var (
signed bool
signedAnnounce announceData
)
for _, p := range peers {
switch p.announceType {
case announceTypeSimple:
select {
case p.announceChn <- announce:
default:
pm.removePeer(p.id)
}
case announceTypeSigned:
if !signed {
signedAnnounce = announce
signedAnnounce.sign(pm.server.privateKey)
signed = true
}
select {
case p.announceChn <- signedAnnounce:
default:
pm.removePeer(p.id)
}
}
}
}
}
case <-pm.quitSync:
headSub.Unsubscribe()
pm.wg.Done()
return
}
}
}()
}