Official Go implementation of the Ethereum protocol
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go-ethereum/les/server.go

292 lines
9.6 KiB

// 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
import (
"crypto/ecdsa"
"reflect"
"time"
"github.com/ethereum/go-ethereum/common/mclock"
"github.com/ethereum/go-ethereum/eth"
"github.com/ethereum/go-ethereum/les/flowcontrol"
lps "github.com/ethereum/go-ethereum/les/lespay/server"
"github.com/ethereum/go-ethereum/light"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/node"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/p2p/enode"
"github.com/ethereum/go-ethereum/p2p/enr"
"github.com/ethereum/go-ethereum/p2p/nodestate"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rpc"
)
var (
serverSetup = &nodestate.Setup{}
clientPeerField = serverSetup.NewField("clientPeer", reflect.TypeOf(&clientPeer{}))
clientInfoField = serverSetup.NewField("clientInfo", reflect.TypeOf(&clientInfo{}))
connAddressField = serverSetup.NewField("connAddr", reflect.TypeOf(""))
balanceTrackerSetup = lps.NewBalanceTrackerSetup(serverSetup)
priorityPoolSetup = lps.NewPriorityPoolSetup(serverSetup)
)
func init() {
balanceTrackerSetup.Connect(connAddressField, priorityPoolSetup.CapacityField)
priorityPoolSetup.Connect(balanceTrackerSetup.BalanceField, balanceTrackerSetup.UpdateFlag) // NodeBalance implements nodePriority
}
type LesServer struct {
lesCommons
ns *nodestate.NodeStateMachine
archiveMode bool // Flag whether the ethereum node runs in archive mode.
handler *serverHandler
broadcaster *broadcaster
privateKey *ecdsa.PrivateKey
// Flow control and capacity management
fcManager *flowcontrol.ClientManager
costTracker *costTracker
defParams flowcontrol.ServerParams
servingQueue *servingQueue
clientPool *clientPool
minCapacity, maxCapacity uint64
threadsIdle int // Request serving threads count when system is idle.
threadsBusy int // Request serving threads count when system is busy(block insertion).
p2pSrv *p2p.Server
}
func NewLesServer(node *node.Node, e *eth.Ethereum, config *eth.Config) (*LesServer, error) {
ns := nodestate.NewNodeStateMachine(nil, nil, mclock.System{}, serverSetup)
// Calculate the number of threads used to service the light client
// requests based on the user-specified value.
threads := config.LightServ * 4 / 100
if threads < 4 {
threads = 4
}
srv := &LesServer{
lesCommons: lesCommons{
genesis: e.BlockChain().Genesis().Hash(),
config: config,
chainConfig: e.BlockChain().Config(),
iConfig: light.DefaultServerIndexerConfig,
chainDb: e.ChainDb(),
chainReader: e.BlockChain(),
chtIndexer: light.NewChtIndexer(e.ChainDb(), nil, params.CHTFrequency, params.HelperTrieProcessConfirmations, true),
bloomTrieIndexer: light.NewBloomTrieIndexer(e.ChainDb(), nil, params.BloomBitsBlocks, params.BloomTrieFrequency, true),
closeCh: make(chan struct{}),
},
ns: ns,
archiveMode: e.ArchiveMode(),
broadcaster: newBroadcaster(ns),
fcManager: flowcontrol.NewClientManager(nil, &mclock.System{}),
servingQueue: newServingQueue(int64(time.Millisecond*10), float64(config.LightServ)/100),
threadsBusy: config.LightServ/100 + 1,
threadsIdle: threads,
p2pSrv: node.Server(),
}
srv.handler = newServerHandler(srv, e.BlockChain(), e.ChainDb(), e.TxPool(), e.Synced)
srv.costTracker, srv.minCapacity = newCostTracker(e.ChainDb(), config)
srv.oracle = srv.setupOracle(node, e.BlockChain().Genesis().Hash(), config)
// Initialize the bloom trie indexer.
e.BloomIndexer().AddChildIndexer(srv.bloomTrieIndexer)
// Initialize server capacity management fields.
srv.defParams = flowcontrol.ServerParams{
BufLimit: srv.minCapacity * bufLimitRatio,
MinRecharge: srv.minCapacity,
}
// LES flow control tries to more or less guarantee the possibility for the
// clients to send a certain amount of requests at any time and get a quick
// response. Most of the clients want this guarantee but don't actually need
// to send requests most of the time. Our goal is to serve as many clients as
// possible while the actually used server capacity does not exceed the limits
totalRecharge := srv.costTracker.totalRecharge()
srv.maxCapacity = srv.minCapacity * uint64(srv.config.LightPeers)
if totalRecharge > srv.maxCapacity {
srv.maxCapacity = totalRecharge
}
srv.fcManager.SetCapacityLimits(srv.minCapacity, srv.maxCapacity, srv.minCapacity*2)
srv.clientPool = newClientPool(ns, srv.chainDb, srv.minCapacity, defaultConnectedBias, mclock.System{}, srv.dropClient)
srv.clientPool.setDefaultFactors(lps.PriceFactors{TimeFactor: 0, CapacityFactor: 1, RequestFactor: 1}, lps.PriceFactors{TimeFactor: 0, CapacityFactor: 1, RequestFactor: 1})
checkpoint := srv.latestLocalCheckpoint()
if !checkpoint.Empty() {
log.Info("Loaded latest checkpoint", "section", checkpoint.SectionIndex, "head", checkpoint.SectionHead,
"chtroot", checkpoint.CHTRoot, "bloomroot", checkpoint.BloomRoot)
}
srv.chtIndexer.Start(e.BlockChain())
node.RegisterProtocols(srv.Protocols())
node.RegisterAPIs(srv.APIs())
node.RegisterLifecycle(srv)
// disconnect all peers at nsm shutdown
ns.SubscribeField(clientPeerField, func(node *enode.Node, state nodestate.Flags, oldValue, newValue interface{}) {
if state.Equals(serverSetup.OfflineFlag()) && oldValue != nil {
oldValue.(*clientPeer).Peer.Disconnect(p2p.DiscRequested)
}
})
ns.Start()
return srv, nil
}
func (s *LesServer) APIs() []rpc.API {
return []rpc.API{
{
Namespace: "les",
Version: "1.0",
Service: NewPrivateLightAPI(&s.lesCommons),
Public: false,
},
{
Namespace: "les",
Version: "1.0",
Service: NewPrivateLightServerAPI(s),
Public: false,
},
{
Namespace: "debug",
Version: "1.0",
Service: NewPrivateDebugAPI(s),
Public: false,
},
}
}
func (s *LesServer) Protocols() []p2p.Protocol {
ps := s.makeProtocols(ServerProtocolVersions, s.handler.runPeer, func(id enode.ID) interface{} {
if p := s.getClient(id); p != nil {
return p.Info()
}
return nil
}, nil)
// Add "les" ENR entries.
for i := range ps {
ps[i].Attributes = []enr.Entry{&lesEntry{}}
}
return ps
}
// Start starts the LES server
func (s *LesServer) Start() error {
s.privateKey = s.p2pSrv.PrivateKey
s.broadcaster.setSignerKey(s.privateKey)
s.handler.start()
s.wg.Add(1)
go s.capacityManagement()
return nil
}
// Stop stops the LES service
func (s *LesServer) Stop() error {
close(s.closeCh)
s.clientPool.stop()
s.ns.Stop()
s.fcManager.Stop()
s.costTracker.stop()
s.handler.stop()
s.servingQueue.stop()
// Note, bloom trie indexer is closed by parent bloombits indexer.
s.chtIndexer.Close()
s.wg.Wait()
log.Info("Les server stopped")
return nil
}
// capacityManagement starts an event handler loop that updates the recharge curve of
// the client manager and adjusts the client pool's size according to the total
// capacity updates coming from the client manager
func (s *LesServer) capacityManagement() {
defer s.wg.Done()
processCh := make(chan bool, 100)
sub := s.handler.blockchain.SubscribeBlockProcessingEvent(processCh)
defer sub.Unsubscribe()
totalRechargeCh := make(chan uint64, 100)
totalRecharge := s.costTracker.subscribeTotalRecharge(totalRechargeCh)
totalCapacityCh := make(chan uint64, 100)
totalCapacity := s.fcManager.SubscribeTotalCapacity(totalCapacityCh)
s.clientPool.setLimits(s.config.LightPeers, totalCapacity)
var (
busy bool
freePeers uint64
blockProcess mclock.AbsTime
)
updateRecharge := func() {
if busy {
s.servingQueue.setThreads(s.threadsBusy)
s.fcManager.SetRechargeCurve(flowcontrol.PieceWiseLinear{{0, 0}, {totalRecharge, totalRecharge}})
} else {
s.servingQueue.setThreads(s.threadsIdle)
s.fcManager.SetRechargeCurve(flowcontrol.PieceWiseLinear{{0, 0}, {totalRecharge / 10, totalRecharge}, {totalRecharge, totalRecharge}})
}
}
updateRecharge()
for {
select {
case busy = <-processCh:
if busy {
blockProcess = mclock.Now()
} else {
blockProcessingTimer.Update(time.Duration(mclock.Now() - blockProcess))
}
updateRecharge()
case totalRecharge = <-totalRechargeCh:
totalRechargeGauge.Update(int64(totalRecharge))
updateRecharge()
case totalCapacity = <-totalCapacityCh:
totalCapacityGauge.Update(int64(totalCapacity))
newFreePeers := totalCapacity / s.minCapacity
if newFreePeers < freePeers && newFreePeers < uint64(s.config.LightPeers) {
log.Warn("Reduced free peer connections", "from", freePeers, "to", newFreePeers)
}
freePeers = newFreePeers
s.clientPool.setLimits(s.config.LightPeers, totalCapacity)
case <-s.closeCh:
return
}
}
}
func (s *LesServer) getClient(id enode.ID) *clientPeer {
if node := s.ns.GetNode(id); node != nil {
if p, ok := s.ns.GetField(node, clientPeerField).(*clientPeer); ok {
return p
}
}
return nil
}
func (s *LesServer) dropClient(id enode.ID) {
if p := s.getClient(id); p != nil {
p.Peer.Disconnect(p2p.DiscRequested)
}
}