mirror of https://github.com/poanetwork/quorum.git
189 lines
5.5 KiB
Go
189 lines
5.5 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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"math/rand"
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"time"
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"github.com/ethereum/go-ethereum/common"
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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/logger"
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"github.com/ethereum/go-ethereum/logger/glog"
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"github.com/ethereum/go-ethereum/p2p/discover"
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)
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const (
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forceSyncCycle = 10 * time.Second // Time interval to force syncs, even if few peers are available
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minDesiredPeerCount = 5 // Amount of peers desired to start syncing
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// This is the target size for the packs of transactions sent by txsyncLoop.
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// A pack can get larger than this if a single transactions exceeds this size.
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txsyncPackSize = 100 * 1024
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)
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type txsync struct {
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p *peer
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txs []*types.Transaction
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}
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// syncTransactions starts sending all currently pending transactions to the given peer.
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func (pm *ProtocolManager) syncTransactions(p *peer) {
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txs := pm.txpool.GetTransactions()
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if len(txs) == 0 {
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return
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}
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select {
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case pm.txsyncCh <- &txsync{p, txs}:
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case <-pm.quitSync:
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}
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}
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// txsyncLoop takes care of the initial transaction sync for each new
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// connection. When a new peer appears, we relay all currently pending
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// transactions. In order to minimise egress bandwidth usage, we send
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// the transactions in small packs to one peer at a time.
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func (pm *ProtocolManager) txsyncLoop() {
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var (
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pending = make(map[discover.NodeID]*txsync)
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sending = false // whether a send is active
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pack = new(txsync) // the pack that is being sent
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done = make(chan error, 1) // result of the send
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)
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// send starts a sending a pack of transactions from the sync.
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send := func(s *txsync) {
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// Fill pack with transactions up to the target size.
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size := common.StorageSize(0)
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pack.p = s.p
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pack.txs = pack.txs[:0]
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for i := 0; i < len(s.txs) && size < txsyncPackSize; i++ {
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pack.txs = append(pack.txs, s.txs[i])
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size += s.txs[i].Size()
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}
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// Remove the transactions that will be sent.
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s.txs = s.txs[:copy(s.txs, s.txs[len(pack.txs):])]
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if len(s.txs) == 0 {
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delete(pending, s.p.ID())
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}
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// Send the pack in the background.
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glog.V(logger.Detail).Infof("%v: sending %d transactions (%v)", s.p.Peer, len(pack.txs), size)
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sending = true
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go func() { done <- pack.p.SendTransactions(pack.txs) }()
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}
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// pick chooses the next pending sync.
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pick := func() *txsync {
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if len(pending) == 0 {
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return nil
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}
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n := rand.Intn(len(pending)) + 1
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for _, s := range pending {
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if n--; n == 0 {
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return s
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}
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}
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return nil
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}
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for {
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select {
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case s := <-pm.txsyncCh:
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pending[s.p.ID()] = s
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if !sending {
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send(s)
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}
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case err := <-done:
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sending = false
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// Stop tracking peers that cause send failures.
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if err != nil {
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glog.V(logger.Debug).Infof("%v: tx send failed: %v", pack.p.Peer, err)
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delete(pending, pack.p.ID())
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}
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// Schedule the next send.
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if s := pick(); s != nil {
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send(s)
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}
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case <-pm.quitSync:
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return
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}
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}
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}
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// syncer is responsible for periodically synchronising with the network, both
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// downloading hashes and blocks as well as handling the announcement handler.
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func (pm *ProtocolManager) syncer() {
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// Start and ensure cleanup of sync mechanisms
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pm.fetcher.Start()
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defer pm.fetcher.Stop()
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defer pm.downloader.Terminate()
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// Wait for different events to fire synchronisation operations
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forceSync := time.Tick(forceSyncCycle)
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for {
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select {
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case <-pm.newPeerCh:
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// Make sure we have peers to select from, then sync
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if pm.peers.Len() < minDesiredPeerCount {
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break
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}
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go pm.synchronise(pm.peers.BestPeer())
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case <-forceSync:
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// Force a sync even if not enough peers are present
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go pm.synchronise(pm.peers.BestPeer())
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case <-pm.quitSync:
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return
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}
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}
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}
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// synchronise tries to sync up our local block chain with a remote peer.
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func (pm *ProtocolManager) synchronise(peer *peer) {
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// Short circuit if no peers are available
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if peer == nil {
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return
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}
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// Make sure the peer's TD is higher than our own. If not drop.
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td := pm.blockchain.GetTd(pm.blockchain.CurrentBlock().Hash())
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if peer.Td().Cmp(td) <= 0 {
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return
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}
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// Otherwise try to sync with the downloader
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mode := downloader.FullSync
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if pm.fastSync {
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mode = downloader.FastSync
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}
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if err := pm.downloader.Synchronise(peer.id, peer.Head(), peer.Td(), mode); err != nil {
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return
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}
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// If fast sync was enabled, and we synced up, disable it
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if pm.fastSync {
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// Wait until all pending imports finish processing
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for pm.downloader.Synchronising() {
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time.Sleep(100 * time.Millisecond)
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}
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// Disable fast sync if we indeed have something in our chain
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if pm.blockchain.CurrentBlock().NumberU64() > 0 {
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glog.V(logger.Info).Infof("fast sync complete, auto disabling")
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pm.fastSync = false
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}
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}
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}
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