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peermanager.go
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peermanager.go
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/* @file @copyright defined in aergo/LICENSE.txt */
package p2p
import (
"fmt"
"net"
"strconv"
"sync"
"sync/atomic"
"time"
"github.com/aergoio/aergo/p2p/metric"
"github.com/aergoio/aergo/p2p/p2pcommon"
"github.com/aergoio/aergo/p2p/p2putil"
"github.com/aergoio/aergo/p2p/subproto"
inet "github.com/libp2p/go-libp2p-net"
"github.com/aergoio/aergo-lib/log"
"github.com/aergoio/aergo/message"
"github.com/aergoio/aergo/types"
cfg "github.com/aergoio/aergo/config"
peer "github.com/libp2p/go-libp2p-peer"
)
const (
initial = iota
running = iota
stopping = iota
)
/**
* peerManager connect to and listen from other nodes.
* It implements Component interface
*/
type peerManager struct {
status int32
nt p2pcommon.NetworkTransport
hsFactory HSHandlerFactory
handlerFactory HandlerFactory
actorService p2pcommon.ActorService
signer p2pcommon.MsgSigner
mf p2pcommon.MoFactory
mm metric.MetricsManager
// designatedPeers and hiddenPeerSet is set in construction time once and will not be changed
hiddenPeerSet map[peer.ID]bool
mutex *sync.Mutex
manageNumber uint32
remotePeers map[peer.ID]*remotePeerImpl
peerPool map[peer.ID]p2pcommon.PeerMeta
conf *cfg.P2PConfig
// peerCache is copy-on-write style
peerCache []p2pcommon.RemotePeer
addPeerChannel chan p2pcommon.PeerMeta
fillPoolChannel chan []p2pcommon.PeerMeta
finishChannel chan struct{}
eventListeners []PeerEventListener
//
designatedPeers map[peer.ID]p2pcommon.PeerMeta
awaitMutex sync.RWMutex
awaitPeers map[peer.ID]*reconnectJob
awaitDone chan struct{}
logger *log.Logger
}
var _ p2pcommon.PeerManager = (*peerManager)(nil)
// PeerEventListener listen peer manage event
type PeerEventListener interface {
// OnAddPeer is called just after the peer is added.
OnAddPeer(peerID peer.ID)
// OnRemovePeer is called just before the peer is removed
OnRemovePeer(peerID peer.ID)
}
// NewPeerManager creates a peer manager object.
func NewPeerManager(handlerFactory HandlerFactory, hsFactory HSHandlerFactory, iServ p2pcommon.ActorService, cfg *cfg.Config, signer p2pcommon.MsgSigner, nt p2pcommon.NetworkTransport, mm metric.MetricsManager, logger *log.Logger, mf p2pcommon.MoFactory) p2pcommon.PeerManager {
p2pConf := cfg.P2P
//logger.SetLevel("debug")
pm := &peerManager{
nt: nt,
handlerFactory: handlerFactory,
hsFactory: hsFactory,
actorService: iServ,
conf: p2pConf,
signer: signer,
mf: mf,
mm: mm,
logger: logger,
mutex: &sync.Mutex{},
status: initial,
designatedPeers: make(map[peer.ID]p2pcommon.PeerMeta, len(cfg.P2P.NPAddPeers)),
hiddenPeerSet: make(map[peer.ID]bool, len(cfg.P2P.NPHiddenPeers)),
remotePeers: make(map[peer.ID]*remotePeerImpl, p2pConf.NPMaxPeers),
awaitPeers: make(map[peer.ID]*reconnectJob, p2pConf.NPPeerPool),
peerPool: make(map[peer.ID]p2pcommon.PeerMeta, p2pConf.NPPeerPool),
peerCache: make([]p2pcommon.RemotePeer, 0, p2pConf.NPMaxPeers),
awaitDone: make(chan struct{}),
addPeerChannel: make(chan p2pcommon.PeerMeta, 2),
fillPoolChannel: make(chan []p2pcommon.PeerMeta, 2),
eventListeners: make([]PeerEventListener, 0, 4),
finishChannel: make(chan struct{}),
}
// additional initializations
pm.init()
return pm
}
func (pm *peerManager) SelfMeta() p2pcommon.PeerMeta {
return pm.nt.SelfMeta()
}
func (pm *peerManager) SelfNodeID() peer.ID {
return pm.nt.ID()
}
func (pm *peerManager) RegisterEventListener(listener PeerEventListener) {
pm.mutex.Lock()
defer pm.mutex.Unlock()
pm.eventListeners = append(pm.eventListeners, listener)
}
func (pm *peerManager) init() {
// set designated peers
pm.initDesignatedPeerList()
// init hidden peers
for _, pidStr := range pm.conf.NPHiddenPeers {
pid, err := peer.IDB58Decode(pidStr)
if err != nil {
panic("Invalid pid in NPHiddenPeers : " + pidStr + " err " + err.Error())
}
pm.hiddenPeerSet[pid] = true
}
}
func (pm *peerManager) Start() error {
go pm.runManagePeers()
// need to start listen after chainservice is read to init
// FIXME: adhoc code
go func() {
//time.Sleep(time.Second * 3)
pm.nt.AddStreamHandler(p2pcommon.AergoP2PSub, pm.onConnect)
pm.logger.Info().Str("version", string(p2pcommon.AergoP2PSub)).Msg("Starting p2p listening")
// addition should start after all modules are started
go func() {
time.Sleep(time.Second * 2)
for _, meta := range pm.designatedPeers {
pm.addPeerChannel <- meta
}
}()
}()
if !atomic.CompareAndSwapInt32(&pm.status, initial, running) {
panic("wrong internal status")
}
return nil
}
func (pm *peerManager) Stop() error {
if !atomic.CompareAndSwapInt32(&pm.status, running, stopping) {
pm.finishChannel <- struct{}{}
}
return nil
}
func (pm *peerManager) initDesignatedPeerList() {
// add remote node from config
for _, target := range pm.conf.NPAddPeers {
peerMeta, err := ParseMultiAddrString(target)
if err != nil {
pm.logger.Warn().Err(err).Str("str", target).Msg("invalid NPAddPeer address")
continue
}
peerMeta.Designated = true
peerMeta.Outbound = true
pm.logger.Info().Str(p2putil.LogFullID, peerMeta.ID.Pretty()).Str(p2putil.LogPeerID, p2putil.ShortForm(peerMeta.ID)).Str("addr", peerMeta.IPAddress).Uint32("port", peerMeta.Port).Msg("Adding Designated peer")
pm.designatedPeers[peerMeta.ID] = peerMeta
}
}
func (pm *peerManager) runManagePeers() {
initialAddrDelay := time.Second * 20
initialTimer := time.NewTimer(initialAddrDelay)
addrTicker := time.NewTicker(DiscoveryQueryInterval)
MANLOOP:
for {
select {
case meta := <-pm.addPeerChannel:
if pm.addOutboundPeer(meta) {
pm.cancelAwait(meta.ID)
}
case <-initialTimer.C:
initialTimer.Stop()
pm.checkAndCollectPeerListFromAll()
case <-addrTicker.C:
pm.checkAndCollectPeerListFromAll()
case peerMetas := <-pm.fillPoolChannel:
pm.tryFillPool(&peerMetas)
case <-pm.finishChannel:
addrTicker.Stop()
break MANLOOP
}
}
// guarrenty no new peer connection will be made
pm.cancelAllAwait()
pm.nt.RemoveStreamHandler(p2pcommon.AergoP2PSub)
pm.logger.Info().Msg("Finishing peerManager")
go func() {
// closing all peer connections
for _, peer := range pm.peerCache {
peer.Stop()
}
}()
timer := time.NewTimer(time.Second * 30)
finishPoll := time.NewTicker(time.Second)
CLEANUPLOOP:
for {
select {
case <-finishPoll.C:
pm.mutex.Lock()
if len(pm.remotePeers) == 0 {
pm.mutex.Unlock()
pm.logger.Debug().Msg("All peers were finished peerManager")
break CLEANUPLOOP
}
pm.mutex.Unlock()
case <-timer.C:
pm.logger.Warn().Int("remained", len(pm.peerCache)).Msg("peermanager stop timeout. some peers were not finished.")
break CLEANUPLOOP
}
}
}
// addOutboundPeer try to connect and handshake to remote peer. it can be called after peermanager is inited.
// It return true if peer is added or return false if failed to add peer or more suitable connection already exists.
func (pm *peerManager) addOutboundPeer(meta p2pcommon.PeerMeta) bool {
s, err := pm.nt.GetOrCreateStream(meta, p2pcommon.AergoP2PSub)
if err != nil {
pm.logger.Info().Err(err).Str(p2putil.LogPeerID, p2putil.ShortForm(meta.ID)).Msg("Failed to get stream.")
return false
}
completeMeta, added := pm.tryAddPeer(true, meta, s)
if !added {
s.Close()
return false
} else {
if meta.IPAddress != completeMeta.IPAddress {
pm.logger.Debug().Str(p2putil.LogPeerID, p2putil.ShortForm(completeMeta.ID)).Str("before", meta.IPAddress).Str("after", completeMeta.IPAddress).Msg("IP address of remote peer is changed to ")
}
}
return true
}
// tryAddPeer will do check connecting peer and add. it will return peer meta information received from
// remote peer. stream s will be owned to remotePeer if succeed to add perr.
func (pm *peerManager) tryAddPeer(outbound bool, meta p2pcommon.PeerMeta, s inet.Stream) (p2pcommon.PeerMeta, bool) {
var peerID = meta.ID
rd := metric.NewReader(s)
wt := metric.NewWriter(s)
h := pm.hsFactory.CreateHSHandler(outbound, pm, pm.actorService, pm.logger, peerID)
rw, remoteStatus, err := h.Handle(rd, wt, defaultHandshakeTTL)
if err != nil {
pm.logger.Debug().Err(err).Str(p2putil.LogPeerID, p2putil.ShortForm(meta.ID)).Msg("Failed to handshake")
if rw != nil {
pm.sendGoAway(rw, err.Error())
}
return meta, false
}
// update peer meta info using sent information from remote peer
receivedMeta := p2pcommon.NewMetaFromStatus(remoteStatus, outbound)
if receivedMeta.ID != peerID {
pm.logger.Debug().Str("received_peer_id", receivedMeta.ID.Pretty()).Str(p2putil.LogPeerID, p2putil.ShortForm(peerID)).Msg("Inconsistent peerID")
pm.sendGoAway(rw, "Inconsistent peerID")
return meta, false
}
_, receivedMeta.Designated = pm.designatedPeers[peerID]
// adding peer to peer list
newPeer, err := pm.registerPeer(peerID, receivedMeta, remoteStatus, s, rw)
if err != nil {
pm.sendGoAway(rw, err.Error())
return meta, false
}
newPeer.metric = pm.mm.Add(peerID, rd, wt)
if pm.logger.IsDebugEnabled() {
addrStrs := pm.nt.GetAddressesOfPeer(peerID)
pm.logger.Debug().Strs("addrs", addrStrs).Str(p2putil.LogPeerID, p2putil.ShortForm(peerID)).Msg("addresses of peer")
}
pm.doPostHandshake(peerID, remoteStatus)
// notice to p2pmanager that handshaking is finished
pm.NotifyPeerHandshake(peerID)
return receivedMeta, true
}
func (pm *peerManager) registerPeer(peerID peer.ID, receivedMeta p2pcommon.PeerMeta, status *types.Status, s inet.Stream, rw p2pcommon.MsgReadWriter) (*remotePeerImpl, error) {
pm.mutex.Lock()
defer pm.mutex.Unlock()
preExistPeer, ok := pm.remotePeers[peerID]
if ok {
pm.logger.Info().Str(p2putil.LogPeerID, p2putil.ShortForm(peerID)).Msg("Peer add collision. Outbound connection of higher hash will survive.")
iAmLower := p2putil.ComparePeerID(pm.SelfNodeID(), receivedMeta.ID) <= 0
if iAmLower == receivedMeta.Outbound {
pm.logger.Info().Str("local_peer_id", p2putil.ShortForm(pm.SelfNodeID())).Str(p2putil.LogPeerID, p2putil.ShortForm(peerID)).Bool("outbound", receivedMeta.Outbound).Msg("Close connection and keep earlier handshake connection.")
return nil, fmt.Errorf("Already handshake peer %s ", p2putil.ShortForm(peerID))
} else {
pm.logger.Info().Str("local_peer_id", p2putil.ShortForm(pm.SelfNodeID())).Str(p2putil.LogPeerID, p2putil.ShortForm(peerID)).Bool("outbound", receivedMeta.Outbound).Msg("Keep connection and close earlier handshake connection.")
// stopping lower valued connection
preExistPeer.Stop()
}
}
outboundPeer := newRemotePeer(receivedMeta, pm.GetNextManageNum(), pm, pm.actorService, pm.logger, pm.mf, pm.signer, s, rw)
outboundPeer.UpdateBlkCache(status.GetBestBlockHash(), status.GetBestHeight())
// insert Handlers
pm.handlerFactory.insertHandlers(outboundPeer)
go outboundPeer.RunPeer()
pm.insertPeer(peerID, outboundPeer)
pm.logger.Info().Bool("outbound", receivedMeta.Outbound).Str(p2putil.LogPeerName, outboundPeer.Name()).Str("addr", net.ParseIP(receivedMeta.IPAddress).String()+":"+strconv.Itoa(int(receivedMeta.Port))).Msg("peer is added to peerService")
return outboundPeer, nil
}
// doPostHandshake is additional work after peer is added.
func (pm *peerManager) doPostHandshake(peerID peer.ID, remoteStatus *types.Status) {
pm.logger.Debug().Uint64("target", remoteStatus.BestHeight).Msg("request new syncer")
pm.actorService.SendRequest(message.SyncerSvc, &message.SyncStart{PeerID: peerID, TargetNo: remoteStatus.BestHeight})
// sync mempool tx infos
// TODO add tx handling
}
func (pm *peerManager) GetNextManageNum() uint32 {
return atomic.AddUint32(&pm.manageNumber, 1)
}
func (pm *peerManager) sendGoAway(rw p2pcommon.MsgReadWriter, msg string) {
goMsg := &types.GoAwayNotice{Message: msg}
// TODO code smell. non safe casting.
mo := pm.mf.NewMsgRequestOrder(false, subproto.GoAway, goMsg).(*pbRequestOrder)
container := mo.message
rw.WriteMsg(container)
}
func (pm *peerManager) AddNewPeer(peer p2pcommon.PeerMeta) {
pm.addPeerChannel <- peer
}
func (pm *peerManager) RemovePeer(peer p2pcommon.RemotePeer) {
pm.removePeer(peer)
}
func (pm *peerManager) NotifyPeerHandshake(peerID peer.ID) {
// TODO code smell.
if pm.conf.NPDiscoverPeers {
pm.checkAndCollectPeerList(peerID)
}
}
func (pm *peerManager) NotifyPeerAddressReceived(metas []p2pcommon.PeerMeta) {
pm.fillPoolChannel <- metas
}
// removePeer unregister managed remote peer connection
// It return true if peer is exist and managed by peermanager
func (pm *peerManager) removePeer(peer p2pcommon.RemotePeer) bool {
peerID := peer.ID()
pm.mutex.Lock()
target, ok := pm.remotePeers[peerID]
if !ok {
pm.mutex.Unlock()
return false
}
if target.manageNum != peer.ManageNumber() {
pm.logger.Debug().Uint32("remove_num", peer.ManageNumber()).Uint32("exist_num", target.ManageNumber()).Str(p2putil.LogPeerID, p2putil.ShortForm(peerID)).Msg("remove peer is requested but already removed and other instance is on")
pm.mutex.Unlock()
return false
}
if target.State() == types.RUNNING {
pm.logger.Warn().Str(p2putil.LogPeerID, p2putil.ShortForm(peerID)).Msg("remove peer is requested but peer is still running")
}
pm.deletePeer(peerID)
pm.logger.Info().Uint32("manage_num", peer.ManageNumber()).Str(p2putil.LogPeerID, p2putil.ShortForm(peerID)).Msg("removed peer in peermanager")
pm.mutex.Unlock()
for _, listener := range pm.eventListeners {
listener.OnRemovePeer(peerID)
}
if meta, found := pm.designatedPeers[peer.ID()]; found {
pm.addAwait(meta)
}
return true
}
func (pm *peerManager) onConnect(s inet.Stream) {
peerID := s.Conn().RemotePeer()
tempMeta := p2pcommon.PeerMeta{ID: peerID}
addr := s.Conn().RemoteMultiaddr()
pm.logger.Debug().Str(p2putil.LogFullID, peerID.Pretty()).Str("multiaddr", addr.String()).Msg("new inbound peer arrived")
completeMeta, added := pm.tryAddPeer(false, tempMeta, s)
if !added {
s.Close()
} else {
if tempMeta.IPAddress != completeMeta.IPAddress {
pm.logger.Debug().Str("after", completeMeta.IPAddress).Msg("Update IP address of inbound remote peer")
}
}
}
func (pm *peerManager) checkAndCollectPeerListFromAll() {
if pm.hasEnoughPeers() {
return
}
if pm.conf.NPUsePolaris {
pm.logger.Debug().Msg("Sending map query to polaris")
pm.actorService.SendRequest(message.P2PSvc, &message.MapQueryMsg{Count: MaxAddrListSizePolaris})
}
// if server is not discover new peer, such as of BP or backup node, it does not send addresses reqeust to other peer.
// These types are only connect to designated peers.
if pm.conf.NPDiscoverPeers {
// not strictly need to check peers. so use cache instead
for _, remotePeer := range pm.peerCache {
pm.actorService.SendRequest(message.P2PSvc, &message.GetAddressesMsg{ToWhom: remotePeer.ID(), Size: MaxAddrListSizePeer, Offset: 0})
}
}
}
func (pm *peerManager) checkAndCollectPeerList(ID peer.ID) {
if pm.hasEnoughPeers() {
return
}
rPeer, ok := pm.GetPeer(ID)
if !ok {
pm.logger.Warn().Str(p2putil.LogFullID, ID.Pretty()).Msg("invalid peer id")
return
}
pm.actorService.SendRequest(message.P2PSvc, &message.GetAddressesMsg{ToWhom: rPeer.ID(), Size: 20, Offset: 0})
}
func (pm *peerManager) hasEnoughPeers() bool {
return len(pm.peerPool) >= pm.conf.NPPeerPool
}
// tryConnectPeers should be called in runManagePeers() only
func (pm *peerManager) tryFillPool(metas *[]p2pcommon.PeerMeta) {
added := make([]p2pcommon.PeerMeta, 0, len(*metas))
invalid := make([]string, 0)
for _, meta := range *metas {
if string(meta.ID) == "" {
invalid = append(invalid, p2putil.ShortMetaForm(meta))
continue
}
_, found := pm.peerPool[meta.ID]
if !found {
// change some properties
meta.Outbound = true
meta.Designated = false
pm.peerPool[meta.ID] = meta
added = append(added, meta)
}
}
if len(invalid) > 0 {
pm.logger.Warn().Strs("metas", invalid).Msg("invalid meta list was come")
}
pm.logger.Debug().Int("added_cnt", len(added)).Msg("Filled unknown peer addresses to peerpool")
pm.tryConnectPeers()
}
// tryConnectPeers should be called in runManagePeers() only
func (pm *peerManager) tryConnectPeers() {
remained := pm.conf.NPMaxPeers - len(pm.remotePeers)
for ID, meta := range pm.peerPool {
if _, found := pm.GetPeer(ID); found {
delete(pm.peerPool, ID)
continue
}
if meta.IPAddress == "" || meta.Port == 0 {
pm.logger.Warn().Str(p2putil.LogPeerID, p2putil.ShortForm(meta.ID)).Str("addr", meta.IPAddress).
Uint32("port", meta.Port).Msg("Invalid peer meta informations")
continue
}
// in same go rountine.
pm.addOutboundPeer(meta)
remained--
if remained <= 0 {
break
}
}
}
func (pm *peerManager) GetPeer(ID peer.ID) (p2pcommon.RemotePeer, bool) {
pm.mutex.Lock()
defer pm.mutex.Unlock()
// vs code's lint does not allow direct return of map operation
ptr, ok := pm.remotePeers[ID]
if !ok {
return nil, false
}
return ptr, ok
}
func (pm *peerManager) GetPeers() []p2pcommon.RemotePeer {
pm.mutex.Lock()
defer pm.mutex.Unlock()
return pm.peerCache
}
func (pm *peerManager) GetPeerBlockInfos() []types.PeerBlockInfo {
pm.mutex.Lock()
defer pm.mutex.Unlock()
infos := make([]types.PeerBlockInfo, len(pm.peerCache))
for i, peer := range pm.peerCache {
infos[i] = peer
}
return infos
}
func (pm *peerManager) GetPeerAddresses(noHidden bool, showSelf bool) []*message.PeerInfo {
peers := make([]*message.PeerInfo, 0, len(pm.peerCache))
if showSelf {
meta := pm.SelfMeta()
addr := meta.ToPeerAddress()
bestBlk, err := pm.actorService.GetChainAccessor().GetBestBlock()
if err != nil {
return nil
}
selfpi := &message.PeerInfo{
&addr, meta.Hidden, time.Now(), bestBlk.BlockHash(), bestBlk.Header.BlockNo, types.RUNNING, true}
peers = append(peers, selfpi)
}
for _, aPeer := range pm.peerCache {
meta := aPeer.Meta()
if noHidden && meta.Hidden {
continue
}
addr := meta.ToPeerAddress()
lastNoti := aPeer.LastNotice()
pi := &message.PeerInfo{
&addr, meta.Hidden, lastNoti.CheckTime, lastNoti.BlockHash, lastNoti.BlockNumber, aPeer.State(), false}
peers = append(peers, pi)
}
return peers
}
// this method should be called inside pm.mutex
func (pm *peerManager) insertPeer(ID peer.ID, peer *remotePeerImpl) {
if _, exist := pm.hiddenPeerSet[ID]; exist {
peer.meta.Hidden = true
}
pm.remotePeers[ID] = peer
pm.updatePeerCache()
}
// this method should be called inside pm.mutex
func (pm *peerManager) deletePeer(ID peer.ID) {
pm.mm.Remove(ID)
delete(pm.remotePeers, ID)
pm.updatePeerCache()
}
func (pm *peerManager) updatePeerCache() {
newSlice := make([]p2pcommon.RemotePeer, 0, len(pm.remotePeers))
for _, rPeer := range pm.remotePeers {
newSlice = append(newSlice, rPeer)
}
pm.peerCache = newSlice
}
func (pm *peerManager) addAwait(meta p2pcommon.PeerMeta) {
pm.awaitMutex.Lock()
defer pm.awaitMutex.Unlock()
if _, exist := pm.awaitPeers[meta.ID]; exist {
return
}
if atomic.LoadInt32(&pm.status) != running {
return
}
job := newReconnectRunner(meta, pm, pm.logger)
pm.awaitPeers[meta.ID] = job
go job.runJob()
}
func (pm *peerManager) cancelAwait(id peer.ID) {
pm.awaitMutex.Lock()
defer pm.awaitMutex.Unlock()
defer func() {
if atomic.LoadInt32(&pm.status) == stopping &&
len(pm.awaitPeers) == 0 {
pm.awaitDone <- struct{}{}
}
}()
job, exist := pm.awaitPeers[id]
if !exist {
return
}
delete(pm.awaitPeers, id)
job.cancel <- struct{}{}
}
func (pm *peerManager) cancelAllAwait() {
for id, _ := range pm.awaitPeers {
go pm.cancelAwait(id)
}
<-pm.awaitDone
}