plugeth/les/server.go
Felföldi Zsolt 2cdf6ee7e0 light: CHT and bloom trie indexers working in light mode (#16534)
This PR enables the indexers to work in light client mode by
downloading a part of these tries (the Merkle proofs of the last
values of the last known section) in order to be able to add new
values and recalculate subsequent hashes. It also adds CHT data to
NodeInfo.
2018-08-15 22:25:46 +02:00

384 lines
10 KiB
Go

// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// Package les implements the Light Ethereum Subprotocol.
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 {
config *eth.Config
protocolManager *ProtocolManager
fcManager *flowcontrol.ClientManager // nil if our node is client only
fcCostStats *requestCostStats
defParams *flowcontrol.ServerParams
lesTopics []discv5.Topic
privateKey *ecdsa.PrivateKey
quitSync chan struct{}
chtIndexer, bloomTrieIndexer *core.ChainIndexer
}
func NewLesServer(eth *eth.Ethereum, config *eth.Config) (*LesServer, error) {
quitSync := make(chan struct{})
pm, err := NewProtocolManager(eth.BlockChain().Config(), false, ServerProtocolVersions, 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{
config: config,
protocolManager: pm,
quitSync: quitSync,
lesTopics: lesTopics,
chtIndexer: light.NewChtIndexer(eth.ChainDb(), false, nil),
bloomTrieIndexer: light.NewBloomTrieIndexer(eth.ChainDb(), false, nil),
}
logger := log.New()
chtV1SectionCount, _, _ := srv.chtIndexer.Sections() // indexer still uses LES/1 4k section size for backwards server compatibility
chtV2SectionCount := chtV1SectionCount / (light.CHTFrequencyClient / light.CHTFrequencyServer)
if chtV2SectionCount != 0 {
// convert to LES/2 section
chtLastSection := chtV2SectionCount - 1
// convert last LES/2 section index back to LES/1 index for chtIndexer.SectionHead
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.protocolManager.SubProtocols
}
// Start starts the LES server
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)
}
// Stop stops the LES service
func (s *LesServer) Stop() {
s.chtIndexer.Close()
// bloom trie indexer is closed by parent bloombits indexer
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("RequestCostList")
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
}
}
}()
}