482 lines
14 KiB
Go
482 lines
14 KiB
Go
// Copyright 2019 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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"context"
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"math/big"
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"math/rand"
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"sync"
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"sync/atomic"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/mclock"
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"github.com/ethereum/go-ethereum/core/forkid"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/eth/downloader"
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"github.com/ethereum/go-ethereum/eth/protocols/eth"
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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/params"
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)
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// clientHandler is responsible for receiving and processing all incoming server
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// responses.
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type clientHandler struct {
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ulc *ulc
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forkFilter forkid.Filter
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checkpoint *params.TrustedCheckpoint
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fetcher *lightFetcher
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downloader *downloader.Downloader
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backend *LightEthereum
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closeCh chan struct{}
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wg sync.WaitGroup // WaitGroup used to track all connected peers.
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// Hooks used in the testing
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syncStart func(header *types.Header) // Hook called when the syncing is started
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syncEnd func(header *types.Header) // Hook called when the syncing is done
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}
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func newClientHandler(ulcServers []string, ulcFraction int, checkpoint *params.TrustedCheckpoint, backend *LightEthereum) *clientHandler {
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handler := &clientHandler{
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forkFilter: forkid.NewFilter(backend.blockchain),
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checkpoint: checkpoint,
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backend: backend,
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closeCh: make(chan struct{}),
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}
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if ulcServers != nil {
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ulc, err := newULC(ulcServers, ulcFraction)
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if err != nil {
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log.Error("Failed to initialize ultra light client")
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}
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handler.ulc = ulc
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log.Info("Enable ultra light client mode")
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}
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var height uint64
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if checkpoint != nil {
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height = (checkpoint.SectionIndex+1)*params.CHTFrequency - 1
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}
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handler.fetcher = newLightFetcher(backend.blockchain, backend.engine, backend.peers, handler.ulc, backend.chainDb, backend.reqDist, handler.synchronise)
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handler.downloader = downloader.New(height, backend.chainDb, nil, backend.eventMux, nil, backend.blockchain, handler.removePeer)
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handler.backend.peers.subscribe((*downloaderPeerNotify)(handler))
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return handler
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}
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func (h *clientHandler) start() {
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h.fetcher.start()
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}
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func (h *clientHandler) stop() {
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close(h.closeCh)
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h.downloader.Terminate()
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h.fetcher.stop()
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h.wg.Wait()
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}
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// runPeer is the p2p protocol run function for the given version.
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func (h *clientHandler) runPeer(version uint, p *p2p.Peer, rw p2p.MsgReadWriter) error {
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trusted := false
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if h.ulc != nil {
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trusted = h.ulc.trusted(p.ID())
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}
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peer := newServerPeer(int(version), h.backend.config.NetworkId, trusted, p, newMeteredMsgWriter(rw, int(version)))
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defer peer.close()
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h.wg.Add(1)
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defer h.wg.Done()
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err := h.handle(peer)
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return err
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}
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func (h *clientHandler) handle(p *serverPeer) error {
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if h.backend.peers.len() >= h.backend.config.LightPeers && !p.Peer.Info().Network.Trusted {
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return p2p.DiscTooManyPeers
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}
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p.Log().Debug("Light Ethereum peer connected", "name", p.Name())
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// Execute the LES handshake
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forkid := forkid.NewID(h.backend.blockchain.Config(), h.backend.genesis, h.backend.blockchain.CurrentHeader().Number.Uint64())
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if err := p.Handshake(h.backend.blockchain.Genesis().Hash(), forkid, h.forkFilter); err != nil {
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p.Log().Debug("Light Ethereum handshake failed", "err", err)
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return err
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}
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// Register peer with the server pool
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if h.backend.serverPool != nil {
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if nvt, err := h.backend.serverPool.RegisterNode(p.Node()); err == nil {
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p.setValueTracker(nvt)
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p.updateVtParams()
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defer func() {
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p.setValueTracker(nil)
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h.backend.serverPool.UnregisterNode(p.Node())
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}()
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} else {
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return err
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}
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}
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// Register the peer locally
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if err := h.backend.peers.register(p); err != nil {
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p.Log().Error("Light Ethereum peer registration failed", "err", err)
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return err
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}
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serverConnectionGauge.Update(int64(h.backend.peers.len()))
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connectedAt := mclock.Now()
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defer func() {
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h.backend.peers.unregister(p.id)
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connectionTimer.Update(time.Duration(mclock.Now() - connectedAt))
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serverConnectionGauge.Update(int64(h.backend.peers.len()))
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}()
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h.fetcher.announce(p, &announceData{Hash: p.headInfo.Hash, Number: p.headInfo.Number, Td: p.headInfo.Td})
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// Mark the peer starts to be served.
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atomic.StoreUint32(&p.serving, 1)
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defer atomic.StoreUint32(&p.serving, 0)
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// Spawn a main loop to handle all incoming messages.
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for {
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if err := h.handleMsg(p); err != nil {
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p.Log().Debug("Light Ethereum message handling failed", "err", err)
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p.fcServer.DumpLogs()
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return err
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}
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}
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}
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// handleMsg is invoked whenever an inbound message is received from a remote
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// peer. The remote connection is torn down upon returning any error.
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func (h *clientHandler) handleMsg(p *serverPeer) error {
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// Read the next message from the remote peer, and ensure it's fully consumed
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msg, err := p.rw.ReadMsg()
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if err != nil {
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return err
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}
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p.Log().Trace("Light Ethereum message arrived", "code", msg.Code, "bytes", msg.Size)
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if msg.Size > ProtocolMaxMsgSize {
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return errResp(ErrMsgTooLarge, "%v > %v", msg.Size, ProtocolMaxMsgSize)
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}
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defer msg.Discard()
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var deliverMsg *Msg
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// Handle the message depending on its contents
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switch {
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case msg.Code == AnnounceMsg:
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p.Log().Trace("Received announce message")
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var req announceData
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if err := msg.Decode(&req); err != nil {
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return errResp(ErrDecode, "%v: %v", msg, err)
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}
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if err := req.sanityCheck(); err != nil {
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return err
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}
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update, size := req.Update.decode()
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if p.rejectUpdate(size) {
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return errResp(ErrRequestRejected, "")
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}
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p.updateFlowControl(update)
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p.updateVtParams()
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if req.Hash != (common.Hash{}) {
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if p.announceType == announceTypeNone {
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return errResp(ErrUnexpectedResponse, "")
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}
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if p.announceType == announceTypeSigned {
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if err := req.checkSignature(p.ID(), update); err != nil {
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p.Log().Trace("Invalid announcement signature", "err", err)
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return err
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}
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p.Log().Trace("Valid announcement signature")
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}
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p.Log().Trace("Announce message content", "number", req.Number, "hash", req.Hash, "td", req.Td, "reorg", req.ReorgDepth)
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// Update peer head information first and then notify the announcement
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p.updateHead(req.Hash, req.Number, req.Td)
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h.fetcher.announce(p, &req)
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}
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case msg.Code == BlockHeadersMsg:
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p.Log().Trace("Received block header response message")
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var resp struct {
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ReqID, BV uint64
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Headers []*types.Header
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}
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if err := msg.Decode(&resp); err != nil {
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return errResp(ErrDecode, "msg %v: %v", msg, err)
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}
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headers := resp.Headers
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p.fcServer.ReceivedReply(resp.ReqID, resp.BV)
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p.answeredRequest(resp.ReqID)
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// Filter out the explicitly requested header by the retriever
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if h.backend.retriever.requested(resp.ReqID) {
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deliverMsg = &Msg{
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MsgType: MsgBlockHeaders,
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ReqID: resp.ReqID,
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Obj: resp.Headers,
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}
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} else {
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// Filter out any explicitly requested headers, deliver the rest to the downloader
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filter := len(headers) == 1
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if filter {
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headers = h.fetcher.deliverHeaders(p, resp.ReqID, resp.Headers)
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}
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if len(headers) != 0 || !filter {
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if err := h.downloader.DeliverHeaders(p.id, headers); err != nil {
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log.Debug("Failed to deliver headers", "err", err)
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}
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}
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}
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case msg.Code == BlockBodiesMsg:
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p.Log().Trace("Received block bodies response")
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var resp struct {
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ReqID, BV uint64
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Data []*types.Body
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}
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if err := msg.Decode(&resp); err != nil {
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return errResp(ErrDecode, "msg %v: %v", msg, err)
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}
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p.fcServer.ReceivedReply(resp.ReqID, resp.BV)
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p.answeredRequest(resp.ReqID)
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deliverMsg = &Msg{
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MsgType: MsgBlockBodies,
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ReqID: resp.ReqID,
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Obj: resp.Data,
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}
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case msg.Code == CodeMsg:
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p.Log().Trace("Received code response")
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var resp struct {
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ReqID, BV uint64
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Data [][]byte
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}
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if err := msg.Decode(&resp); err != nil {
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return errResp(ErrDecode, "msg %v: %v", msg, err)
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}
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p.fcServer.ReceivedReply(resp.ReqID, resp.BV)
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p.answeredRequest(resp.ReqID)
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deliverMsg = &Msg{
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MsgType: MsgCode,
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ReqID: resp.ReqID,
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Obj: resp.Data,
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}
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case msg.Code == ReceiptsMsg:
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p.Log().Trace("Received receipts response")
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var resp struct {
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ReqID, BV uint64
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Receipts []types.Receipts
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}
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if err := msg.Decode(&resp); err != nil {
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return errResp(ErrDecode, "msg %v: %v", msg, err)
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}
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p.fcServer.ReceivedReply(resp.ReqID, resp.BV)
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p.answeredRequest(resp.ReqID)
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deliverMsg = &Msg{
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MsgType: MsgReceipts,
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ReqID: resp.ReqID,
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Obj: resp.Receipts,
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}
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case msg.Code == ProofsV2Msg:
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p.Log().Trace("Received les/2 proofs response")
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var resp struct {
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ReqID, BV uint64
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Data light.NodeList
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}
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if err := msg.Decode(&resp); err != nil {
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return errResp(ErrDecode, "msg %v: %v", msg, err)
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}
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p.fcServer.ReceivedReply(resp.ReqID, resp.BV)
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p.answeredRequest(resp.ReqID)
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deliverMsg = &Msg{
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MsgType: MsgProofsV2,
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ReqID: resp.ReqID,
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Obj: resp.Data,
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}
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case msg.Code == HelperTrieProofsMsg:
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p.Log().Trace("Received helper trie proof response")
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var resp struct {
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ReqID, BV uint64
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Data HelperTrieResps
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}
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if err := msg.Decode(&resp); err != nil {
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return errResp(ErrDecode, "msg %v: %v", msg, err)
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}
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p.fcServer.ReceivedReply(resp.ReqID, resp.BV)
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p.answeredRequest(resp.ReqID)
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deliverMsg = &Msg{
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MsgType: MsgHelperTrieProofs,
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ReqID: resp.ReqID,
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Obj: resp.Data,
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}
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case msg.Code == TxStatusMsg:
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p.Log().Trace("Received tx status response")
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var resp struct {
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ReqID, BV uint64
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Status []light.TxStatus
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}
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if err := msg.Decode(&resp); err != nil {
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return errResp(ErrDecode, "msg %v: %v", msg, err)
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}
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p.fcServer.ReceivedReply(resp.ReqID, resp.BV)
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p.answeredRequest(resp.ReqID)
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deliverMsg = &Msg{
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MsgType: MsgTxStatus,
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ReqID: resp.ReqID,
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Obj: resp.Status,
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}
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case msg.Code == StopMsg && p.version >= lpv3:
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p.freeze()
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h.backend.retriever.frozen(p)
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p.Log().Debug("Service stopped")
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case msg.Code == ResumeMsg && p.version >= lpv3:
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var bv uint64
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if err := msg.Decode(&bv); err != nil {
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return errResp(ErrDecode, "msg %v: %v", msg, err)
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}
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p.fcServer.ResumeFreeze(bv)
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p.unfreeze()
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p.Log().Debug("Service resumed")
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default:
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p.Log().Trace("Received invalid message", "code", msg.Code)
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return errResp(ErrInvalidMsgCode, "%v", msg.Code)
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}
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// Deliver the received response to retriever.
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if deliverMsg != nil {
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if err := h.backend.retriever.deliver(p, deliverMsg); err != nil {
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if val := p.errCount.Add(1, mclock.Now()); val > maxResponseErrors {
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return err
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}
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}
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}
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return nil
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}
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func (h *clientHandler) removePeer(id string) {
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h.backend.peers.unregister(id)
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}
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type peerConnection struct {
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handler *clientHandler
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peer *serverPeer
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}
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func (pc *peerConnection) Head() (common.Hash, *big.Int) {
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return pc.peer.HeadAndTd()
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}
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func (pc *peerConnection) RequestHeadersByHash(origin common.Hash, amount int, skip int, reverse bool) error {
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rq := &distReq{
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getCost: func(dp distPeer) uint64 {
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peer := dp.(*serverPeer)
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return peer.getRequestCost(GetBlockHeadersMsg, amount)
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},
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canSend: func(dp distPeer) bool {
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return dp.(*serverPeer) == pc.peer
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},
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request: func(dp distPeer) func() {
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reqID := rand.Uint64()
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peer := dp.(*serverPeer)
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cost := peer.getRequestCost(GetBlockHeadersMsg, amount)
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peer.fcServer.QueuedRequest(reqID, cost)
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return func() { peer.requestHeadersByHash(reqID, origin, amount, skip, reverse) }
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},
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}
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_, ok := <-pc.handler.backend.reqDist.queue(rq)
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if !ok {
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return light.ErrNoPeers
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}
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return nil
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}
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func (pc *peerConnection) RequestHeadersByNumber(origin uint64, amount int, skip int, reverse bool) error {
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rq := &distReq{
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getCost: func(dp distPeer) uint64 {
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peer := dp.(*serverPeer)
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return peer.getRequestCost(GetBlockHeadersMsg, amount)
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},
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canSend: func(dp distPeer) bool {
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return dp.(*serverPeer) == pc.peer
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},
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request: func(dp distPeer) func() {
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reqID := rand.Uint64()
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peer := dp.(*serverPeer)
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cost := peer.getRequestCost(GetBlockHeadersMsg, amount)
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peer.fcServer.QueuedRequest(reqID, cost)
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return func() { peer.requestHeadersByNumber(reqID, origin, amount, skip, reverse) }
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},
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}
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_, ok := <-pc.handler.backend.reqDist.queue(rq)
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if !ok {
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return light.ErrNoPeers
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}
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return nil
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}
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// RetrieveSingleHeaderByNumber requests a single header by the specified block
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// number. This function will wait the response until it's timeout or delivered.
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func (pc *peerConnection) RetrieveSingleHeaderByNumber(context context.Context, number uint64) (*types.Header, error) {
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reqID := rand.Uint64()
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rq := &distReq{
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getCost: func(dp distPeer) uint64 {
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peer := dp.(*serverPeer)
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return peer.getRequestCost(GetBlockHeadersMsg, 1)
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},
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canSend: func(dp distPeer) bool {
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return dp.(*serverPeer) == pc.peer
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},
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request: func(dp distPeer) func() {
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peer := dp.(*serverPeer)
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cost := peer.getRequestCost(GetBlockHeadersMsg, 1)
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peer.fcServer.QueuedRequest(reqID, cost)
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return func() { peer.requestHeadersByNumber(reqID, number, 1, 0, false) }
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},
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}
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var header *types.Header
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if err := pc.handler.backend.retriever.retrieve(context, reqID, rq, func(peer distPeer, msg *Msg) error {
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if msg.MsgType != MsgBlockHeaders {
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return errInvalidMessageType
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}
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headers := msg.Obj.([]*types.Header)
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if len(headers) != 1 {
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return errInvalidEntryCount
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}
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header = headers[0]
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return nil
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}, nil); err != nil {
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return nil, err
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}
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return header, nil
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}
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// downloaderPeerNotify implements peerSetNotify
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type downloaderPeerNotify clientHandler
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func (d *downloaderPeerNotify) registerPeer(p *serverPeer) {
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h := (*clientHandler)(d)
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pc := &peerConnection{
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handler: h,
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peer: p,
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}
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h.downloader.RegisterLightPeer(p.id, eth.ETH65, pc)
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}
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func (d *downloaderPeerNotify) unregisterPeer(p *serverPeer) {
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h := (*clientHandler)(d)
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h.downloader.UnregisterPeer(p.id)
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}
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