plugeth/les/server.go
Felföldi Zsolt 92580d69d3 p2p, p2p/discover, p2p/discv5: implement UDP port sharing (#15200)
This commit affects p2p/discv5 "topic discovery" by running it on
the same UDP port where the old discovery works. This is realized
by giving an "unhandled" packet channel to the old v4 discovery
packet handler where all invalid packets are sent. These packets
are then processed by v5. v5 packets are always invalid when
interpreted by v4 and vice versa. This is ensured by adding one
to the first byte of the packet hash in v5 packets.

DiscoveryV5Bootnodes is also changed to point to new bootnodes
that are implementing the changed packet format with modified
hash. Existing and new v5 bootnodes are both running on different
ports ATM.
2018-01-22 13:38:34 +01:00

381 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"
"fmt"
"math"
"sync"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"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 {
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, 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{
protocolManager: pm,
quitSync: quitSync,
lesTopics: lesTopics,
chtIndexer: light.NewChtIndexer(eth.ChainDb(), false),
bloomTrieIndexer: light.NewBloomTrieIndexer(eth.ChainDb(), false),
}
logger := log.New()
chtV1SectionCount, _, _ := srv.chtIndexer.Sections() // indexer still uses LES/1 4k section size for backwards server compatibility
chtV2SectionCount := chtV1SectionCount / (light.ChtFrequency / light.ChtV1Frequency)
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.ChtFrequency/light.ChtV1Frequency) - 1
chtSectionHead := srv.chtIndexer.SectionHead(chtLastSectionV1)
chtRoot := light.GetChtV2Root(pm.chainDb, chtLastSection, chtSectionHead)
logger.Info("CHT", "section", chtLastSection, "sectionHead", fmt.Sprintf("%064x", chtSectionHead), "root", fmt.Sprintf("%064x", 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("BloomTrie", "section", bloomTrieLastSection, "sectionHead", fmt.Sprintf("%064x", bloomTrieSectionHead), "root", fmt.Sprintf("%064x", 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()
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 := core.GetTd(pm.chainDb, hash, number)
if td != nil && td.Cmp(lastBroadcastTd) > 0 {
var reorg uint64
if lastHead != nil {
reorg = lastHead.Number.Uint64() - core.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
}
}
}()
}