mirror of https://github.com/poanetwork/quorum.git
267 lines
8.9 KiB
Go
267 lines
8.9 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package les
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import (
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"crypto/ecdsa"
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"time"
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"github.com/ethereum/go-ethereum/accounts/abi/bind"
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"github.com/ethereum/go-ethereum/common/mclock"
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"github.com/ethereum/go-ethereum/core"
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"github.com/ethereum/go-ethereum/eth"
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"github.com/ethereum/go-ethereum/les/flowcontrol"
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"github.com/ethereum/go-ethereum/light"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/p2p"
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"github.com/ethereum/go-ethereum/p2p/discv5"
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"github.com/ethereum/go-ethereum/p2p/enode"
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"github.com/ethereum/go-ethereum/p2p/enr"
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"github.com/ethereum/go-ethereum/params"
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"github.com/ethereum/go-ethereum/rpc"
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)
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type LesServer struct {
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lesCommons
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archiveMode bool // Flag whether the ethereum node runs in archive mode.
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handler *serverHandler
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lesTopics []discv5.Topic
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privateKey *ecdsa.PrivateKey
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// Flow control and capacity management
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fcManager *flowcontrol.ClientManager
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costTracker *costTracker
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defParams flowcontrol.ServerParams
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servingQueue *servingQueue
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clientPool *clientPool
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freeCapacity uint64 // The minimal client capacity used for free client.
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threadsIdle int // Request serving threads count when system is idle.
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threadsBusy int // Request serving threads count when system is busy(block insertion).
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}
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func NewLesServer(e *eth.Ethereum, config *eth.Config) (*LesServer, error) {
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// Collect les protocol version information supported by local node.
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lesTopics := make([]discv5.Topic, len(AdvertiseProtocolVersions))
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for i, pv := range AdvertiseProtocolVersions {
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lesTopics[i] = lesTopic(e.BlockChain().Genesis().Hash(), pv)
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}
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// Calculate the number of threads used to service the light client
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// requests based on the user-specified value.
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threads := config.LightServ * 4 / 100
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if threads < 4 {
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threads = 4
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}
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srv := &LesServer{
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lesCommons: lesCommons{
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genesis: e.BlockChain().Genesis().Hash(),
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config: config,
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chainConfig: e.BlockChain().Config(),
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iConfig: light.DefaultServerIndexerConfig,
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chainDb: e.ChainDb(),
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peers: newPeerSet(),
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chainReader: e.BlockChain(),
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chtIndexer: light.NewChtIndexer(e.ChainDb(), nil, params.CHTFrequency, params.HelperTrieProcessConfirmations),
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bloomTrieIndexer: light.NewBloomTrieIndexer(e.ChainDb(), nil, params.BloomBitsBlocks, params.BloomTrieFrequency),
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closeCh: make(chan struct{}),
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},
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archiveMode: e.ArchiveMode(),
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lesTopics: lesTopics,
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fcManager: flowcontrol.NewClientManager(nil, &mclock.System{}),
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servingQueue: newServingQueue(int64(time.Millisecond*10), float64(config.LightServ)/100),
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threadsBusy: config.LightServ/100 + 1,
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threadsIdle: threads,
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}
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srv.handler = newServerHandler(srv, e.BlockChain(), e.ChainDb(), e.TxPool(), e.Synced)
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srv.costTracker, srv.freeCapacity = newCostTracker(e.ChainDb(), config)
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// Set up checkpoint oracle.
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oracle := config.CheckpointOracle
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if oracle == nil {
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oracle = params.CheckpointOracles[e.BlockChain().Genesis().Hash()]
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}
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srv.oracle = newCheckpointOracle(oracle, srv.localCheckpoint)
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// Initialize server capacity management fields.
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srv.defParams = flowcontrol.ServerParams{
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BufLimit: srv.freeCapacity * bufLimitRatio,
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MinRecharge: srv.freeCapacity,
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}
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// LES flow control tries to more or less guarantee the possibility for the
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// clients to send a certain amount of requests at any time and get a quick
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// response. Most of the clients want this guarantee but don't actually need
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// to send requests most of the time. Our goal is to serve as many clients as
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// possible while the actually used server capacity does not exceed the limits
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totalRecharge := srv.costTracker.totalRecharge()
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maxCapacity := srv.freeCapacity * uint64(srv.config.LightPeers)
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if totalRecharge > maxCapacity {
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maxCapacity = totalRecharge
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}
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srv.fcManager.SetCapacityLimits(srv.freeCapacity, maxCapacity, srv.freeCapacity*2)
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srv.clientPool = newClientPool(srv.chainDb, srv.freeCapacity, mclock.System{}, func(id enode.ID) { go srv.peers.Unregister(peerIdToString(id)) })
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srv.clientPool.setPriceFactors(priceFactors{0, 1, 1}, priceFactors{0, 1, 1})
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checkpoint := srv.latestLocalCheckpoint()
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if !checkpoint.Empty() {
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log.Info("Loaded latest checkpoint", "section", checkpoint.SectionIndex, "head", checkpoint.SectionHead,
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"chtroot", checkpoint.CHTRoot, "bloomroot", checkpoint.BloomRoot)
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}
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srv.chtIndexer.Start(e.BlockChain())
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return srv, nil
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}
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func (s *LesServer) APIs() []rpc.API {
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return []rpc.API{
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{
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Namespace: "les",
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Version: "1.0",
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Service: NewPrivateLightAPI(&s.lesCommons),
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Public: false,
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},
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}
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}
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func (s *LesServer) Protocols() []p2p.Protocol {
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ps := s.makeProtocols(ServerProtocolVersions, s.handler.runPeer, func(id enode.ID) interface{} {
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if p := s.peers.Peer(peerIdToString(id)); p != nil {
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return p.Info()
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}
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return nil
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})
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// Add "les" ENR entries.
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for i := range ps {
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ps[i].Attributes = []enr.Entry{&lesEntry{}}
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}
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return ps
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}
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// Start starts the LES server
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func (s *LesServer) Start(srvr *p2p.Server) {
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s.privateKey = srvr.PrivateKey
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s.handler.start()
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s.wg.Add(1)
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go s.capacityManagement()
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if srvr.DiscV5 != nil {
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for _, topic := range s.lesTopics {
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topic := topic
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go func() {
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logger := log.New("topic", topic)
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logger.Info("Starting topic registration")
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defer logger.Info("Terminated topic registration")
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srvr.DiscV5.RegisterTopic(topic, s.closeCh)
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}()
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}
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}
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}
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// Stop stops the LES service
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func (s *LesServer) Stop() {
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close(s.closeCh)
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// Disconnect existing sessions.
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// This also closes the gate for any new registrations on the peer set.
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// sessions which are already established but not added to pm.peers yet
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// will exit when they try to register.
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s.peers.Close()
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s.fcManager.Stop()
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s.costTracker.stop()
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s.handler.stop()
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s.clientPool.stop() // client pool should be closed after handler.
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s.servingQueue.stop()
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// Note, bloom trie indexer is closed by parent bloombits indexer.
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s.chtIndexer.Close()
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s.wg.Wait()
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log.Info("Les server stopped")
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}
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func (s *LesServer) SetBloomBitsIndexer(bloomIndexer *core.ChainIndexer) {
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bloomIndexer.AddChildIndexer(s.bloomTrieIndexer)
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}
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// SetClient sets the rpc client and starts running checkpoint contract if it is not yet watched.
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func (s *LesServer) SetContractBackend(backend bind.ContractBackend) {
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if s.oracle == nil {
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return
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}
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s.oracle.start(backend)
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}
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// capacityManagement starts an event handler loop that updates the recharge curve of
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// the client manager and adjusts the client pool's size according to the total
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// capacity updates coming from the client manager
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func (s *LesServer) capacityManagement() {
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defer s.wg.Done()
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processCh := make(chan bool, 100)
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sub := s.handler.blockchain.SubscribeBlockProcessingEvent(processCh)
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defer sub.Unsubscribe()
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totalRechargeCh := make(chan uint64, 100)
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totalRecharge := s.costTracker.subscribeTotalRecharge(totalRechargeCh)
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totalCapacityCh := make(chan uint64, 100)
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totalCapacity := s.fcManager.SubscribeTotalCapacity(totalCapacityCh)
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s.clientPool.setLimits(s.config.LightPeers, totalCapacity)
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var (
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busy bool
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freePeers uint64
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blockProcess mclock.AbsTime
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)
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updateRecharge := func() {
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if busy {
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s.servingQueue.setThreads(s.threadsBusy)
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s.fcManager.SetRechargeCurve(flowcontrol.PieceWiseLinear{{0, 0}, {totalRecharge, totalRecharge}})
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} else {
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s.servingQueue.setThreads(s.threadsIdle)
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s.fcManager.SetRechargeCurve(flowcontrol.PieceWiseLinear{{0, 0}, {totalRecharge / 10, totalRecharge}, {totalRecharge, totalRecharge}})
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}
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}
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updateRecharge()
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for {
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select {
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case busy = <-processCh:
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if busy {
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blockProcess = mclock.Now()
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} else {
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blockProcessingTimer.Update(time.Duration(mclock.Now() - blockProcess))
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}
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updateRecharge()
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case totalRecharge = <-totalRechargeCh:
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totalRechargeGauge.Update(int64(totalRecharge))
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updateRecharge()
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case totalCapacity = <-totalCapacityCh:
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totalCapacityGauge.Update(int64(totalCapacity))
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newFreePeers := totalCapacity / s.freeCapacity
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if newFreePeers < freePeers && newFreePeers < uint64(s.config.LightPeers) {
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log.Warn("Reduced free peer connections", "from", freePeers, "to", newFreePeers)
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}
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freePeers = newFreePeers
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s.clientPool.setLimits(s.config.LightPeers, totalCapacity)
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case <-s.closeCh:
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return
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}
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}
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}
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