791 lines
27 KiB
Go
791 lines
27 KiB
Go
// Copyright 2015 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 eth
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import (
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"encoding/json"
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"errors"
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"fmt"
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"math"
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"math/big"
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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/consensus"
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"github.com/ethereum/go-ethereum/consensus/misc"
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"github.com/ethereum/go-ethereum/core"
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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/fetcher"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/event"
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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/discover"
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"github.com/ethereum/go-ethereum/params"
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"github.com/ethereum/go-ethereum/rlp"
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)
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const (
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softResponseLimit = 2 * 1024 * 1024 // Target maximum size of returned blocks, headers or node data.
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estHeaderRlpSize = 500 // Approximate size of an RLP encoded block header
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// txChanSize is the size of channel listening to NewTxsEvent.
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// The number is referenced from the size of tx pool.
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txChanSize = 4096
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)
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var (
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daoChallengeTimeout = 15 * time.Second // Time allowance for a node to reply to the DAO handshake challenge
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)
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// errIncompatibleConfig is returned if the requested protocols and configs are
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// not compatible (low protocol version restrictions and high requirements).
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var errIncompatibleConfig = errors.New("incompatible configuration")
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func errResp(code errCode, format string, v ...interface{}) error {
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return fmt.Errorf("%v - %v", code, fmt.Sprintf(format, v...))
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}
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type ProtocolManager struct {
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networkID uint64
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fastSync uint32 // Flag whether fast sync is enabled (gets disabled if we already have blocks)
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acceptTxs uint32 // Flag whether we're considered synchronised (enables transaction processing)
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txpool txPool
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blockchain *core.BlockChain
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chainconfig *params.ChainConfig
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maxPeers int
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downloader *downloader.Downloader
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fetcher *fetcher.Fetcher
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peers *peerSet
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SubProtocols []p2p.Protocol
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eventMux *event.TypeMux
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txsCh chan core.NewTxsEvent
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txsSub event.Subscription
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minedBlockSub *event.TypeMuxSubscription
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// channels for fetcher, syncer, txsyncLoop
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newPeerCh chan *peer
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txsyncCh chan *txsync
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quitSync chan struct{}
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noMorePeers chan struct{}
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// wait group is used for graceful shutdowns during downloading
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// and processing
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wg sync.WaitGroup
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}
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// NewProtocolManager returns a new Ethereum sub protocol manager. The Ethereum sub protocol manages peers capable
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// with the Ethereum network.
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func NewProtocolManager(config *params.ChainConfig, mode downloader.SyncMode, networkID uint64, mux *event.TypeMux, txpool txPool, engine consensus.Engine, blockchain *core.BlockChain, chaindb ethdb.Database) (*ProtocolManager, error) {
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// Create the protocol manager with the base fields
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manager := &ProtocolManager{
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networkID: networkID,
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eventMux: mux,
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txpool: txpool,
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blockchain: blockchain,
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chainconfig: config,
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peers: newPeerSet(),
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newPeerCh: make(chan *peer),
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noMorePeers: make(chan struct{}),
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txsyncCh: make(chan *txsync),
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quitSync: make(chan struct{}),
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}
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// Figure out whether to allow fast sync or not
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if mode == downloader.FastSync && blockchain.CurrentBlock().NumberU64() > 0 {
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log.Warn("Blockchain not empty, fast sync disabled")
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mode = downloader.FullSync
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}
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if mode == downloader.FastSync {
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manager.fastSync = uint32(1)
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}
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// Initiate a sub-protocol for every implemented version we can handle
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manager.SubProtocols = make([]p2p.Protocol, 0, len(ProtocolVersions))
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for i, version := range ProtocolVersions {
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// Skip protocol version if incompatible with the mode of operation
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if mode == downloader.FastSync && version < eth63 {
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continue
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}
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// Compatible; initialise the sub-protocol
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version := version // Closure for the run
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manager.SubProtocols = append(manager.SubProtocols, p2p.Protocol{
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Name: ProtocolName,
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Version: version,
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Length: ProtocolLengths[i],
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Run: func(p *p2p.Peer, rw p2p.MsgReadWriter) error {
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peer := manager.newPeer(int(version), p, rw)
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select {
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case manager.newPeerCh <- peer:
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manager.wg.Add(1)
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defer manager.wg.Done()
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return manager.handle(peer)
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case <-manager.quitSync:
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return p2p.DiscQuitting
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}
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},
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NodeInfo: func() interface{} {
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return manager.NodeInfo()
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},
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PeerInfo: func(id discover.NodeID) interface{} {
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if p := manager.peers.Peer(fmt.Sprintf("%x", id[:8])); 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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})
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}
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if len(manager.SubProtocols) == 0 {
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return nil, errIncompatibleConfig
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}
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// Construct the different synchronisation mechanisms
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manager.downloader = downloader.New(mode, chaindb, manager.eventMux, blockchain, nil, manager.removePeer)
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validator := func(header *types.Header) error {
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return engine.VerifyHeader(blockchain, header, true)
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}
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heighter := func() uint64 {
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return blockchain.CurrentBlock().NumberU64()
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}
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inserter := func(blocks types.Blocks) (int, error) {
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// If fast sync is running, deny importing weird blocks
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if atomic.LoadUint32(&manager.fastSync) == 1 {
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log.Warn("Discarded bad propagated block", "number", blocks[0].Number(), "hash", blocks[0].Hash())
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return 0, nil
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}
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atomic.StoreUint32(&manager.acceptTxs, 1) // Mark initial sync done on any fetcher import
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return manager.blockchain.InsertChain(blocks)
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}
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manager.fetcher = fetcher.New(blockchain.GetBlockByHash, validator, manager.BroadcastBlock, heighter, inserter, manager.removePeer)
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return manager, nil
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}
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func (pm *ProtocolManager) removePeer(id string) {
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// Short circuit if the peer was already removed
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peer := pm.peers.Peer(id)
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if peer == nil {
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return
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}
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log.Debug("Removing Ethereum peer", "peer", id)
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// Unregister the peer from the downloader and Ethereum peer set
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pm.downloader.UnregisterPeer(id)
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if err := pm.peers.Unregister(id); err != nil {
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log.Error("Peer removal failed", "peer", id, "err", err)
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}
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// Hard disconnect at the networking layer
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if peer != nil {
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peer.Peer.Disconnect(p2p.DiscUselessPeer)
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}
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}
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func (pm *ProtocolManager) Start(maxPeers int) {
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pm.maxPeers = maxPeers
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// broadcast transactions
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pm.txsCh = make(chan core.NewTxsEvent, txChanSize)
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pm.txsSub = pm.txpool.SubscribeNewTxsEvent(pm.txsCh)
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go pm.txBroadcastLoop()
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// broadcast mined blocks
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pm.minedBlockSub = pm.eventMux.Subscribe(core.NewMinedBlockEvent{})
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go pm.minedBroadcastLoop()
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// start sync handlers
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go pm.syncer()
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go pm.txsyncLoop()
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}
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func (pm *ProtocolManager) Stop() {
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log.Info("Stopping Ethereum protocol")
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pm.txsSub.Unsubscribe() // quits txBroadcastLoop
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pm.minedBlockSub.Unsubscribe() // quits blockBroadcastLoop
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// Quit the sync loop.
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// After this send has completed, no new peers will be accepted.
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pm.noMorePeers <- struct{}{}
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// Quit fetcher, txsyncLoop.
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close(pm.quitSync)
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// Stop downloader and make sure that all the running downloads are complete.
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pm.downloader.Terminate()
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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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pm.peers.Close()
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// Wait for all peer handler goroutines and the loops to come down.
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pm.wg.Wait()
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log.Info("Ethereum protocol stopped")
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}
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func (pm *ProtocolManager) newPeer(pv int, p *p2p.Peer, rw p2p.MsgReadWriter) *peer {
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return newPeer(pv, p, newMeteredMsgWriter(rw))
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}
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// handle is the callback invoked to manage the life cycle of an eth peer. When
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// this function terminates, the peer is disconnected.
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func (pm *ProtocolManager) handle(p *peer) error {
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// Ignore maxPeers if this is a trusted peer
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if pm.peers.Len() >= pm.maxPeers && !p.Peer.Info().Network.Trusted {
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return p2p.DiscTooManyPeers
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}
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p.Log().Debug("Ethereum peer connected", "name", p.Name())
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// Execute the Ethereum handshake
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var (
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genesis = pm.blockchain.Genesis()
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head = pm.blockchain.CurrentHeader()
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hash = head.Hash()
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number = head.Number.Uint64()
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td = pm.blockchain.GetTd(hash, number)
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)
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if err := p.Handshake(pm.networkID, td, hash, genesis.Hash()); err != nil {
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p.Log().Debug("Ethereum handshake failed", "err", err)
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return err
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}
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if rw, ok := p.rw.(*meteredMsgReadWriter); ok {
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rw.Init(p.version)
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}
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// Register the peer locally
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if err := pm.peers.Register(p); err != nil {
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p.Log().Error("Ethereum peer registration failed", "err", err)
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return err
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}
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defer pm.removePeer(p.id)
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// Register the peer in the downloader. If the downloader considers it banned, we disconnect
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if err := pm.downloader.RegisterPeer(p.id, p.version, p); err != nil {
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return err
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}
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// Propagate existing transactions. new transactions appearing
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// after this will be sent via broadcasts.
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pm.syncTransactions(p)
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// If we're DAO hard-fork aware, validate any remote peer with regard to the hard-fork
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if daoBlock := pm.chainconfig.DAOForkBlock; daoBlock != nil {
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// Request the peer's DAO fork header for extra-data validation
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if err := p.RequestHeadersByNumber(daoBlock.Uint64(), 1, 0, false); err != nil {
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return err
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}
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// Start a timer to disconnect if the peer doesn't reply in time
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p.forkDrop = time.AfterFunc(daoChallengeTimeout, func() {
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p.Log().Debug("Timed out DAO fork-check, dropping")
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pm.removePeer(p.id)
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})
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// Make sure it's cleaned up if the peer dies off
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defer func() {
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if p.forkDrop != nil {
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p.forkDrop.Stop()
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p.forkDrop = nil
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}
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}()
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}
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// main loop. handle incoming messages.
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for {
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if err := pm.handleMsg(p); err != nil {
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p.Log().Debug("Ethereum message handling failed", "err", err)
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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 (pm *ProtocolManager) handleMsg(p *peer) 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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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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// Handle the message depending on its contents
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switch {
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case msg.Code == StatusMsg:
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// Status messages should never arrive after the handshake
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return errResp(ErrExtraStatusMsg, "uncontrolled status message")
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// Block header query, collect the requested headers and reply
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case msg.Code == GetBlockHeadersMsg:
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// Decode the complex header query
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var query getBlockHeadersData
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if err := msg.Decode(&query); err != nil {
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return errResp(ErrDecode, "%v: %v", msg, err)
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}
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hashMode := query.Origin.Hash != (common.Hash{})
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first := true
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maxNonCanonical := uint64(100)
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// Gather headers until the fetch or network limits is reached
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var (
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bytes common.StorageSize
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headers []*types.Header
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unknown bool
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)
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for !unknown && len(headers) < int(query.Amount) && bytes < softResponseLimit && len(headers) < downloader.MaxHeaderFetch {
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// Retrieve the next header satisfying the query
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var origin *types.Header
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if hashMode {
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if first {
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first = false
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origin = pm.blockchain.GetHeaderByHash(query.Origin.Hash)
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if origin != nil {
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query.Origin.Number = origin.Number.Uint64()
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}
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} else {
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origin = pm.blockchain.GetHeader(query.Origin.Hash, query.Origin.Number)
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}
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} else {
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origin = pm.blockchain.GetHeaderByNumber(query.Origin.Number)
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}
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if origin == nil {
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break
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}
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headers = append(headers, origin)
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bytes += estHeaderRlpSize
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// Advance to the next header of the query
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switch {
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case hashMode && query.Reverse:
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// Hash based traversal towards the genesis block
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ancestor := query.Skip + 1
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if ancestor == 0 {
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unknown = true
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} else {
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query.Origin.Hash, query.Origin.Number = pm.blockchain.GetAncestor(query.Origin.Hash, query.Origin.Number, ancestor, &maxNonCanonical)
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unknown = (query.Origin.Hash == common.Hash{})
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}
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case hashMode && !query.Reverse:
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// Hash based traversal towards the leaf block
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var (
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current = origin.Number.Uint64()
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next = current + query.Skip + 1
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)
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if next <= current {
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infos, _ := json.MarshalIndent(p.Peer.Info(), "", " ")
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p.Log().Warn("GetBlockHeaders skip overflow attack", "current", current, "skip", query.Skip, "next", next, "attacker", infos)
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unknown = true
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} else {
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if header := pm.blockchain.GetHeaderByNumber(next); header != nil {
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nextHash := header.Hash()
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expOldHash, _ := pm.blockchain.GetAncestor(nextHash, next, query.Skip+1, &maxNonCanonical)
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if expOldHash == query.Origin.Hash {
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query.Origin.Hash, query.Origin.Number = nextHash, next
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} else {
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unknown = true
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}
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} else {
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unknown = true
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}
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}
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case query.Reverse:
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// Number based traversal towards the genesis block
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if query.Origin.Number >= query.Skip+1 {
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query.Origin.Number -= query.Skip + 1
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} else {
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unknown = true
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}
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case !query.Reverse:
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// Number based traversal towards the leaf block
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query.Origin.Number += query.Skip + 1
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}
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}
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return p.SendBlockHeaders(headers)
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case msg.Code == BlockHeadersMsg:
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// A batch of headers arrived to one of our previous requests
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var headers []*types.Header
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if err := msg.Decode(&headers); err != nil {
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return errResp(ErrDecode, "msg %v: %v", msg, err)
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}
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// If no headers were received, but we're expending a DAO fork check, maybe it's that
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if len(headers) == 0 && p.forkDrop != nil {
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// Possibly an empty reply to the fork header checks, sanity check TDs
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verifyDAO := true
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// If we already have a DAO header, we can check the peer's TD against it. If
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// the peer's ahead of this, it too must have a reply to the DAO check
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if daoHeader := pm.blockchain.GetHeaderByNumber(pm.chainconfig.DAOForkBlock.Uint64()); daoHeader != nil {
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if _, td := p.Head(); td.Cmp(pm.blockchain.GetTd(daoHeader.Hash(), daoHeader.Number.Uint64())) >= 0 {
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verifyDAO = false
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}
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}
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// If we're seemingly on the same chain, disable the drop timer
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if verifyDAO {
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p.Log().Debug("Seems to be on the same side of the DAO fork")
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p.forkDrop.Stop()
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p.forkDrop = nil
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return nil
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}
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}
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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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// If it's a potential DAO fork check, validate against the rules
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if p.forkDrop != nil && pm.chainconfig.DAOForkBlock.Cmp(headers[0].Number) == 0 {
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// Disable the fork drop timer
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p.forkDrop.Stop()
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p.forkDrop = nil
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// Validate the header and either drop the peer or continue
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if err := misc.VerifyDAOHeaderExtraData(pm.chainconfig, headers[0]); err != nil {
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p.Log().Debug("Verified to be on the other side of the DAO fork, dropping")
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return err
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}
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p.Log().Debug("Verified to be on the same side of the DAO fork")
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return nil
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}
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// Irrelevant of the fork checks, send the header to the fetcher just in case
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headers = pm.fetcher.FilterHeaders(p.id, headers, time.Now())
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}
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if len(headers) > 0 || !filter {
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err := pm.downloader.DeliverHeaders(p.id, headers)
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if 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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case msg.Code == GetBlockBodiesMsg:
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// Decode the retrieval message
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msgStream := rlp.NewStream(msg.Payload, uint64(msg.Size))
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if _, err := msgStream.List(); err != nil {
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return err
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}
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// Gather blocks until the fetch or network limits is reached
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var (
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hash common.Hash
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bytes int
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bodies []rlp.RawValue
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)
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for bytes < softResponseLimit && len(bodies) < downloader.MaxBlockFetch {
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// Retrieve the hash of the next block
|
|
if err := msgStream.Decode(&hash); err == rlp.EOL {
|
|
break
|
|
} else if err != nil {
|
|
return errResp(ErrDecode, "msg %v: %v", msg, err)
|
|
}
|
|
// Retrieve the requested block body, stopping if enough was found
|
|
if data := pm.blockchain.GetBodyRLP(hash); len(data) != 0 {
|
|
bodies = append(bodies, data)
|
|
bytes += len(data)
|
|
}
|
|
}
|
|
return p.SendBlockBodiesRLP(bodies)
|
|
|
|
case msg.Code == BlockBodiesMsg:
|
|
// A batch of block bodies arrived to one of our previous requests
|
|
var request blockBodiesData
|
|
if err := msg.Decode(&request); err != nil {
|
|
return errResp(ErrDecode, "msg %v: %v", msg, err)
|
|
}
|
|
// Deliver them all to the downloader for queuing
|
|
transactions := make([][]*types.Transaction, len(request))
|
|
uncles := make([][]*types.Header, len(request))
|
|
|
|
for i, body := range request {
|
|
transactions[i] = body.Transactions
|
|
uncles[i] = body.Uncles
|
|
}
|
|
// Filter out any explicitly requested bodies, deliver the rest to the downloader
|
|
filter := len(transactions) > 0 || len(uncles) > 0
|
|
if filter {
|
|
transactions, uncles = pm.fetcher.FilterBodies(p.id, transactions, uncles, time.Now())
|
|
}
|
|
if len(transactions) > 0 || len(uncles) > 0 || !filter {
|
|
err := pm.downloader.DeliverBodies(p.id, transactions, uncles)
|
|
if err != nil {
|
|
log.Debug("Failed to deliver bodies", "err", err)
|
|
}
|
|
}
|
|
|
|
case p.version >= eth63 && msg.Code == GetNodeDataMsg:
|
|
// Decode the retrieval message
|
|
msgStream := rlp.NewStream(msg.Payload, uint64(msg.Size))
|
|
if _, err := msgStream.List(); err != nil {
|
|
return err
|
|
}
|
|
// Gather state data until the fetch or network limits is reached
|
|
var (
|
|
hash common.Hash
|
|
bytes int
|
|
data [][]byte
|
|
)
|
|
for bytes < softResponseLimit && len(data) < downloader.MaxStateFetch {
|
|
// Retrieve the hash of the next state entry
|
|
if err := msgStream.Decode(&hash); err == rlp.EOL {
|
|
break
|
|
} else if err != nil {
|
|
return errResp(ErrDecode, "msg %v: %v", msg, err)
|
|
}
|
|
// Retrieve the requested state entry, stopping if enough was found
|
|
if entry, err := pm.blockchain.TrieNode(hash); err == nil {
|
|
data = append(data, entry)
|
|
bytes += len(entry)
|
|
}
|
|
}
|
|
return p.SendNodeData(data)
|
|
|
|
case p.version >= eth63 && msg.Code == NodeDataMsg:
|
|
// A batch of node state data arrived to one of our previous requests
|
|
var data [][]byte
|
|
if err := msg.Decode(&data); err != nil {
|
|
return errResp(ErrDecode, "msg %v: %v", msg, err)
|
|
}
|
|
// Deliver all to the downloader
|
|
if err := pm.downloader.DeliverNodeData(p.id, data); err != nil {
|
|
log.Debug("Failed to deliver node state data", "err", err)
|
|
}
|
|
|
|
case p.version >= eth63 && msg.Code == GetReceiptsMsg:
|
|
// Decode the retrieval message
|
|
msgStream := rlp.NewStream(msg.Payload, uint64(msg.Size))
|
|
if _, err := msgStream.List(); err != nil {
|
|
return err
|
|
}
|
|
// Gather state data until the fetch or network limits is reached
|
|
var (
|
|
hash common.Hash
|
|
bytes int
|
|
receipts []rlp.RawValue
|
|
)
|
|
for bytes < softResponseLimit && len(receipts) < downloader.MaxReceiptFetch {
|
|
// Retrieve the hash of the next block
|
|
if err := msgStream.Decode(&hash); err == rlp.EOL {
|
|
break
|
|
} else if err != nil {
|
|
return errResp(ErrDecode, "msg %v: %v", msg, err)
|
|
}
|
|
// Retrieve the requested block's receipts, skipping if unknown to us
|
|
results := pm.blockchain.GetReceiptsByHash(hash)
|
|
if results == nil {
|
|
if header := pm.blockchain.GetHeaderByHash(hash); header == nil || header.ReceiptHash != types.EmptyRootHash {
|
|
continue
|
|
}
|
|
}
|
|
// If known, encode and queue for response packet
|
|
if encoded, err := rlp.EncodeToBytes(results); err != nil {
|
|
log.Error("Failed to encode receipt", "err", err)
|
|
} else {
|
|
receipts = append(receipts, encoded)
|
|
bytes += len(encoded)
|
|
}
|
|
}
|
|
return p.SendReceiptsRLP(receipts)
|
|
|
|
case p.version >= eth63 && msg.Code == ReceiptsMsg:
|
|
// A batch of receipts arrived to one of our previous requests
|
|
var receipts [][]*types.Receipt
|
|
if err := msg.Decode(&receipts); err != nil {
|
|
return errResp(ErrDecode, "msg %v: %v", msg, err)
|
|
}
|
|
// Deliver all to the downloader
|
|
if err := pm.downloader.DeliverReceipts(p.id, receipts); err != nil {
|
|
log.Debug("Failed to deliver receipts", "err", err)
|
|
}
|
|
|
|
case msg.Code == NewBlockHashesMsg:
|
|
var announces newBlockHashesData
|
|
if err := msg.Decode(&announces); err != nil {
|
|
return errResp(ErrDecode, "%v: %v", msg, err)
|
|
}
|
|
// Mark the hashes as present at the remote node
|
|
for _, block := range announces {
|
|
p.MarkBlock(block.Hash)
|
|
}
|
|
// Schedule all the unknown hashes for retrieval
|
|
unknown := make(newBlockHashesData, 0, len(announces))
|
|
for _, block := range announces {
|
|
if !pm.blockchain.HasBlock(block.Hash, block.Number) {
|
|
unknown = append(unknown, block)
|
|
}
|
|
}
|
|
for _, block := range unknown {
|
|
pm.fetcher.Notify(p.id, block.Hash, block.Number, time.Now(), p.RequestOneHeader, p.RequestBodies)
|
|
}
|
|
|
|
case msg.Code == NewBlockMsg:
|
|
// Retrieve and decode the propagated block
|
|
var request newBlockData
|
|
if err := msg.Decode(&request); err != nil {
|
|
return errResp(ErrDecode, "%v: %v", msg, err)
|
|
}
|
|
request.Block.ReceivedAt = msg.ReceivedAt
|
|
request.Block.ReceivedFrom = p
|
|
|
|
// Mark the peer as owning the block and schedule it for import
|
|
p.MarkBlock(request.Block.Hash())
|
|
pm.fetcher.Enqueue(p.id, request.Block)
|
|
|
|
// Assuming the block is importable by the peer, but possibly not yet done so,
|
|
// calculate the head hash and TD that the peer truly must have.
|
|
var (
|
|
trueHead = request.Block.ParentHash()
|
|
trueTD = new(big.Int).Sub(request.TD, request.Block.Difficulty())
|
|
)
|
|
// Update the peers total difficulty if better than the previous
|
|
if _, td := p.Head(); trueTD.Cmp(td) > 0 {
|
|
p.SetHead(trueHead, trueTD)
|
|
|
|
// Schedule a sync if above ours. Note, this will not fire a sync for a gap of
|
|
// a singe block (as the true TD is below the propagated block), however this
|
|
// scenario should easily be covered by the fetcher.
|
|
currentBlock := pm.blockchain.CurrentBlock()
|
|
if trueTD.Cmp(pm.blockchain.GetTd(currentBlock.Hash(), currentBlock.NumberU64())) > 0 {
|
|
go pm.synchronise(p)
|
|
}
|
|
}
|
|
|
|
case msg.Code == TxMsg:
|
|
// Transactions arrived, make sure we have a valid and fresh chain to handle them
|
|
if atomic.LoadUint32(&pm.acceptTxs) == 0 {
|
|
break
|
|
}
|
|
// Transactions can be processed, parse all of them and deliver to the pool
|
|
var txs []*types.Transaction
|
|
if err := msg.Decode(&txs); err != nil {
|
|
return errResp(ErrDecode, "msg %v: %v", msg, err)
|
|
}
|
|
for i, tx := range txs {
|
|
// Validate and mark the remote transaction
|
|
if tx == nil {
|
|
return errResp(ErrDecode, "transaction %d is nil", i)
|
|
}
|
|
p.MarkTransaction(tx.Hash())
|
|
}
|
|
pm.txpool.AddRemotes(txs)
|
|
|
|
default:
|
|
return errResp(ErrInvalidMsgCode, "%v", msg.Code)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// BroadcastBlock will either propagate a block to a subset of it's peers, or
|
|
// will only announce it's availability (depending what's requested).
|
|
func (pm *ProtocolManager) BroadcastBlock(block *types.Block, propagate bool) {
|
|
hash := block.Hash()
|
|
peers := pm.peers.PeersWithoutBlock(hash)
|
|
|
|
// If propagation is requested, send to a subset of the peer
|
|
if propagate {
|
|
// Calculate the TD of the block (it's not imported yet, so block.Td is not valid)
|
|
var td *big.Int
|
|
if parent := pm.blockchain.GetBlock(block.ParentHash(), block.NumberU64()-1); parent != nil {
|
|
td = new(big.Int).Add(block.Difficulty(), pm.blockchain.GetTd(block.ParentHash(), block.NumberU64()-1))
|
|
} else {
|
|
log.Error("Propagating dangling block", "number", block.Number(), "hash", hash)
|
|
return
|
|
}
|
|
// Send the block to a subset of our peers
|
|
transfer := peers[:int(math.Sqrt(float64(len(peers))))]
|
|
for _, peer := range transfer {
|
|
peer.AsyncSendNewBlock(block, td)
|
|
}
|
|
log.Trace("Propagated block", "hash", hash, "recipients", len(transfer), "duration", common.PrettyDuration(time.Since(block.ReceivedAt)))
|
|
return
|
|
}
|
|
// Otherwise if the block is indeed in out own chain, announce it
|
|
if pm.blockchain.HasBlock(hash, block.NumberU64()) {
|
|
for _, peer := range peers {
|
|
peer.AsyncSendNewBlockHash(block)
|
|
}
|
|
log.Trace("Announced block", "hash", hash, "recipients", len(peers), "duration", common.PrettyDuration(time.Since(block.ReceivedAt)))
|
|
}
|
|
}
|
|
|
|
// BroadcastTxs will propagate a batch of transactions to all peers which are not known to
|
|
// already have the given transaction.
|
|
func (pm *ProtocolManager) BroadcastTxs(txs types.Transactions) {
|
|
var txset = make(map[*peer]types.Transactions)
|
|
|
|
// Broadcast transactions to a batch of peers not knowing about it
|
|
for _, tx := range txs {
|
|
peers := pm.peers.PeersWithoutTx(tx.Hash())
|
|
for _, peer := range peers {
|
|
txset[peer] = append(txset[peer], tx)
|
|
}
|
|
log.Trace("Broadcast transaction", "hash", tx.Hash(), "recipients", len(peers))
|
|
}
|
|
// FIXME include this again: peers = peers[:int(math.Sqrt(float64(len(peers))))]
|
|
for peer, txs := range txset {
|
|
peer.AsyncSendTransactions(txs)
|
|
}
|
|
}
|
|
|
|
// Mined broadcast loop
|
|
func (pm *ProtocolManager) minedBroadcastLoop() {
|
|
// automatically stops if unsubscribe
|
|
for obj := range pm.minedBlockSub.Chan() {
|
|
if ev, ok := obj.Data.(core.NewMinedBlockEvent); ok {
|
|
pm.BroadcastBlock(ev.Block, true) // First propagate block to peers
|
|
pm.BroadcastBlock(ev.Block, false) // Only then announce to the rest
|
|
}
|
|
}
|
|
}
|
|
|
|
func (pm *ProtocolManager) txBroadcastLoop() {
|
|
for {
|
|
select {
|
|
case event := <-pm.txsCh:
|
|
pm.BroadcastTxs(event.Txs)
|
|
|
|
// Err() channel will be closed when unsubscribing.
|
|
case <-pm.txsSub.Err():
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// NodeInfo represents a short summary of the Ethereum sub-protocol metadata
|
|
// known about the host peer.
|
|
type NodeInfo struct {
|
|
Network uint64 `json:"network"` // Ethereum network ID (1=Frontier, 2=Morden, Ropsten=3, Rinkeby=4)
|
|
Difficulty *big.Int `json:"difficulty"` // Total difficulty of the host's blockchain
|
|
Genesis common.Hash `json:"genesis"` // SHA3 hash of the host's genesis block
|
|
Config *params.ChainConfig `json:"config"` // Chain configuration for the fork rules
|
|
Head common.Hash `json:"head"` // SHA3 hash of the host's best owned block
|
|
}
|
|
|
|
// NodeInfo retrieves some protocol metadata about the running host node.
|
|
func (pm *ProtocolManager) NodeInfo() *NodeInfo {
|
|
currentBlock := pm.blockchain.CurrentBlock()
|
|
return &NodeInfo{
|
|
Network: pm.networkID,
|
|
Difficulty: pm.blockchain.GetTd(currentBlock.Hash(), currentBlock.NumberU64()),
|
|
Genesis: pm.blockchain.Genesis().Hash(),
|
|
Config: pm.blockchain.Config(),
|
|
Head: currentBlock.Hash(),
|
|
}
|
|
}
|