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gossip_impl.go
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gossip_impl.go
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/*
Copyright IBM Corp. 2016 All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package gossip
import (
"bytes"
"crypto/tls"
"errors"
"fmt"
"reflect"
"sync"
"sync/atomic"
"time"
"github.com/hyperledger/fabric/gossip/api"
"github.com/hyperledger/fabric/gossip/comm"
"github.com/hyperledger/fabric/gossip/common"
"github.com/hyperledger/fabric/gossip/discovery"
"github.com/hyperledger/fabric/gossip/filter"
"github.com/hyperledger/fabric/gossip/gossip/channel"
"github.com/hyperledger/fabric/gossip/gossip/msgstore"
"github.com/hyperledger/fabric/gossip/gossip/pull"
"github.com/hyperledger/fabric/gossip/identity"
"github.com/hyperledger/fabric/gossip/util"
proto "github.com/hyperledger/fabric/protos/gossip"
"github.com/op/go-logging"
"google.golang.org/grpc"
)
const (
presumedDeadChanSize = 100
acceptChanSize = 100
)
var (
identityExpirationCheckInterval = time.Hour * 24
identityInactivityCheckInterval = time.Minute * 10
)
type channelRoutingFilterFactory func(channel.GossipChannel) filter.RoutingFilter
type gossipServiceImpl struct {
selfIdentity api.PeerIdentityType
includeIdentityPeriod time.Time
certStore *certStore
idMapper identity.Mapper
presumedDead chan common.PKIidType
disc discovery.Discovery
comm comm.Comm
incTime time.Time
selfOrg api.OrgIdentityType
*comm.ChannelDeMultiplexer
logger *logging.Logger
stopSignal *sync.WaitGroup
conf *Config
toDieChan chan struct{}
stopFlag int32
emitter batchingEmitter
discAdapter *discoveryAdapter
secAdvisor api.SecurityAdvisor
chanState *channelState
disSecAdap *discoverySecurityAdapter
mcs api.MessageCryptoService
stateInfoMsgStore msgstore.MessageStore
}
// NewGossipService creates a gossip instance attached to a gRPC server
func NewGossipService(conf *Config, s *grpc.Server, secAdvisor api.SecurityAdvisor,
mcs api.MessageCryptoService, idMapper identity.Mapper, selfIdentity api.PeerIdentityType,
secureDialOpts api.PeerSecureDialOpts) Gossip {
var c comm.Comm
var err error
lgr := util.GetLogger(util.LoggingGossipModule, conf.ID)
if s == nil {
c, err = createCommWithServer(conf.BindPort, idMapper, selfIdentity, secureDialOpts)
} else {
c, err = createCommWithoutServer(s, conf.TLSServerCert, idMapper, selfIdentity, secureDialOpts)
}
if err != nil {
lgr.Error("Failed instntiating communication layer:", err)
return nil
}
g := &gossipServiceImpl{
selfOrg: secAdvisor.OrgByPeerIdentity(selfIdentity),
secAdvisor: secAdvisor,
selfIdentity: selfIdentity,
presumedDead: make(chan common.PKIidType, presumedDeadChanSize),
idMapper: idMapper,
disc: nil,
mcs: mcs,
comm: c,
conf: conf,
ChannelDeMultiplexer: comm.NewChannelDemultiplexer(),
logger: lgr,
toDieChan: make(chan struct{}, 1),
stopFlag: int32(0),
stopSignal: &sync.WaitGroup{},
includeIdentityPeriod: time.Now().Add(conf.PublishCertPeriod),
}
g.stateInfoMsgStore = g.newStateInfoMsgStore()
g.chanState = newChannelState(g)
g.emitter = newBatchingEmitter(conf.PropagateIterations,
conf.MaxPropagationBurstSize, conf.MaxPropagationBurstLatency,
g.sendGossipBatch)
g.discAdapter = g.newDiscoveryAdapter()
g.disSecAdap = g.newDiscoverySecurityAdapter()
g.disc = discovery.NewDiscoveryService(g.selfNetworkMember(), g.discAdapter, g.disSecAdap, g.disclosurePolicy)
g.logger.Info("Creating gossip service with self membership of", g.selfNetworkMember())
g.certStore = newCertStore(g.createCertStorePuller(), idMapper, selfIdentity, mcs)
if g.conf.ExternalEndpoint == "" {
g.logger.Warning("External endpoint is empty, peer will not be accessible outside of its organization")
}
go g.start()
go g.periodicalIdentityValidationAndExpiration()
go g.connect2BootstrapPeers()
return g
}
func (g *gossipServiceImpl) newStateInfoMsgStore() msgstore.MessageStore {
pol := proto.NewGossipMessageComparator(0)
return msgstore.NewMessageStoreExpirable(pol,
msgstore.Noop,
g.conf.PublishStateInfoInterval*100,
nil,
nil,
msgstore.Noop)
}
func (g *gossipServiceImpl) selfNetworkMember() discovery.NetworkMember {
self := discovery.NetworkMember{
Endpoint: g.conf.ExternalEndpoint,
PKIid: g.comm.GetPKIid(),
Metadata: []byte{},
InternalEndpoint: g.conf.InternalEndpoint,
}
if g.disc != nil {
self.Metadata = g.disc.Self().Metadata
}
return self
}
func newChannelState(g *gossipServiceImpl) *channelState {
return &channelState{
stopping: int32(0),
channels: make(map[string]channel.GossipChannel),
g: g,
}
}
func createCommWithoutServer(s *grpc.Server, cert *tls.Certificate, idStore identity.Mapper,
identity api.PeerIdentityType, secureDialOpts api.PeerSecureDialOpts) (comm.Comm, error) {
return comm.NewCommInstance(s, cert, idStore, identity, secureDialOpts)
}
// NewGossipServiceWithServer creates a new gossip instance with a gRPC server
func NewGossipServiceWithServer(conf *Config, secAdvisor api.SecurityAdvisor, mcs api.MessageCryptoService,
mapper identity.Mapper, identity api.PeerIdentityType, secureDialOpts api.PeerSecureDialOpts) Gossip {
return NewGossipService(conf, nil, secAdvisor, mcs, mapper, identity, secureDialOpts)
}
func createCommWithServer(port int, idStore identity.Mapper, identity api.PeerIdentityType,
secureDialOpts api.PeerSecureDialOpts) (comm.Comm, error) {
return comm.NewCommInstanceWithServer(port, idStore, identity, secureDialOpts)
}
func (g *gossipServiceImpl) toDie() bool {
return atomic.LoadInt32(&g.stopFlag) == int32(1)
}
func (g *gossipServiceImpl) JoinChan(joinMsg api.JoinChannelMessage, chainID common.ChainID) {
// joinMsg is supposed to have been already verified
g.chanState.joinChannel(joinMsg, chainID)
for _, org := range joinMsg.Members() {
g.learnAnchorPeers(org, joinMsg.AnchorPeersOf(org))
}
}
// SuspectPeers makes the gossip instance validate identities of suspected peers, and close
// any connections to peers with identities that are found invalid
func (g *gossipServiceImpl) SuspectPeers(isSuspected api.PeerSuspector) {
for _, pkiID := range g.certStore.listRevokedPeers(isSuspected) {
g.comm.CloseConn(&comm.RemotePeer{PKIID: pkiID})
}
}
func (g *gossipServiceImpl) periodicalIdentityValidationAndExpiration() {
// We check once every identityExpirationCheckInterval for identities that have been expired
go g.periodicalIdentityValidation(func(identity api.PeerIdentityType) bool {
// We need to validate every identity to check if it has been expired
return true
}, identityExpirationCheckInterval)
// We check once every identityInactivityCheckInterval for identities that have not been used for a long time
go g.periodicalIdentityValidation(func(identity api.PeerIdentityType) bool {
// We don't validate any identity, because we just want to know whether
// it has not been used for a long time
return false
}, identityInactivityCheckInterval)
}
func (g *gossipServiceImpl) periodicalIdentityValidation(suspectFunc api.PeerSuspector, interval time.Duration) {
for {
select {
case s := <-g.toDieChan:
g.toDieChan <- s
return
case <-time.After(interval):
g.SuspectPeers(suspectFunc)
}
}
}
func (g *gossipServiceImpl) learnAnchorPeers(orgOfAnchorPeers api.OrgIdentityType, anchorPeers []api.AnchorPeer) {
for _, ap := range anchorPeers {
if ap.Host == "" {
g.logger.Warning("Got empty hostname, skipping connecting to anchor peer", ap)
continue
}
if ap.Port == 0 {
g.logger.Warning("Got invalid port (0), skipping connecting to anchor peer", ap)
continue
}
endpoint := fmt.Sprintf("%s:%d", ap.Host, ap.Port)
// Skip connecting to self
if g.selfNetworkMember().Endpoint == endpoint || g.selfNetworkMember().InternalEndpoint == endpoint {
g.logger.Info("Anchor peer with same endpoint, skipping connecting to myself")
continue
}
inOurOrg := bytes.Equal(g.selfOrg, orgOfAnchorPeers)
if !inOurOrg && g.selfNetworkMember().Endpoint == "" {
g.logger.Infof("Anchor peer %s:%d isn't in our org(%v) and we have no external endpoint, skipping", ap.Host, ap.Port, string(orgOfAnchorPeers))
continue
}
identifier := func() (*discovery.PeerIdentification, error) {
remotePeerIdentity, err := g.comm.Handshake(&comm.RemotePeer{Endpoint: endpoint})
if err != nil {
g.logger.Warning("Deep probe of", endpoint, "failed:", err)
return nil, err
}
isAnchorPeerInMyOrg := bytes.Equal(g.selfOrg, g.secAdvisor.OrgByPeerIdentity(remotePeerIdentity))
if bytes.Equal(orgOfAnchorPeers, g.selfOrg) && !isAnchorPeerInMyOrg {
err := fmt.Sprintf("Anchor peer %s isn't in our org, but is claimed to be", endpoint)
g.logger.Warning(err)
return nil, errors.New(err)
}
pkiID := g.mcs.GetPKIidOfCert(remotePeerIdentity)
if len(pkiID) == 0 {
return nil, fmt.Errorf("Wasn't able to extract PKI-ID of remote peer with identity of %v", remotePeerIdentity)
}
return &discovery.PeerIdentification{
ID: pkiID,
SelfOrg: isAnchorPeerInMyOrg,
}, nil
}
g.disc.Connect(discovery.NetworkMember{
InternalEndpoint: endpoint, Endpoint: endpoint}, identifier)
}
}
func (g *gossipServiceImpl) handlePresumedDead() {
defer g.logger.Debug("Exiting")
g.stopSignal.Add(1)
defer g.stopSignal.Done()
for {
select {
case s := <-g.toDieChan:
g.toDieChan <- s
return
case deadEndpoint := <-g.comm.PresumedDead():
g.presumedDead <- deadEndpoint
}
}
}
func (g *gossipServiceImpl) syncDiscovery() {
g.logger.Debug("Entering discovery sync with interval", g.conf.PullInterval)
defer g.logger.Debug("Exiting discovery sync loop")
for !g.toDie() {
g.disc.InitiateSync(g.conf.PullPeerNum)
time.Sleep(g.conf.PullInterval)
}
}
func (g *gossipServiceImpl) start() {
go g.syncDiscovery()
go g.handlePresumedDead()
msgSelector := func(msg interface{}) bool {
gMsg, isGossipMsg := msg.(proto.ReceivedMessage)
if !isGossipMsg {
return false
}
isConn := gMsg.GetGossipMessage().GetConn() != nil
isEmpty := gMsg.GetGossipMessage().GetEmpty() != nil
return !(isConn || isEmpty)
}
incMsgs := g.comm.Accept(msgSelector)
go g.acceptMessages(incMsgs)
g.logger.Info("Gossip instance", g.conf.ID, "started")
}
func (g *gossipServiceImpl) acceptMessages(incMsgs <-chan proto.ReceivedMessage) {
defer g.logger.Debug("Exiting")
g.stopSignal.Add(1)
defer g.stopSignal.Done()
for {
select {
case s := <-g.toDieChan:
g.toDieChan <- s
return
case msg := <-incMsgs:
g.handleMessage(msg)
}
}
}
func (g *gossipServiceImpl) handleMessage(m proto.ReceivedMessage) {
if g.toDie() {
return
}
if m == nil || m.GetGossipMessage() == nil {
return
}
msg := m.GetGossipMessage()
g.logger.Debug("Entering,", m.GetConnectionInfo(), "sent us", msg)
defer g.logger.Debug("Exiting")
if !g.validateMsg(m) {
g.logger.Warning("Message", msg, "isn't valid")
return
}
if msg.IsChannelRestricted() {
if gc := g.chanState.lookupChannelForMsg(m); gc == nil {
// If we're not in the channel, we should still forward to peers of our org
// in case it's a StateInfo message
if g.isInMyorg(discovery.NetworkMember{PKIid: m.GetConnectionInfo().ID}) && msg.IsStateInfoMsg() {
if g.stateInfoMsgStore.Add(msg) {
g.emitter.Add(msg)
}
}
if !g.toDie() {
g.logger.Debug("No such channel", msg.Channel, "discarding message", msg)
}
} else {
if m.GetGossipMessage().IsLeadershipMsg() {
if err := g.validateLeadershipMessage(m.GetGossipMessage()); err != nil {
g.logger.Warning("Failed validating LeaderElection message:", err)
return
}
}
gc.HandleMessage(m)
}
return
}
if selectOnlyDiscoveryMessages(m) {
// It's a membership request, check its self information
// matches the sender
if m.GetGossipMessage().GetMemReq() != nil {
sMsg, err := m.GetGossipMessage().GetMemReq().SelfInformation.ToGossipMessage()
if err != nil {
g.logger.Warning("Got membership request with invalid selfInfo:", err)
return
}
if !sMsg.IsAliveMsg() {
g.logger.Warning("Got membership request with selfInfo that isn't an AliveMessage")
return
}
if !bytes.Equal(sMsg.GetAliveMsg().Membership.PkiId, m.GetConnectionInfo().ID) {
g.logger.Warning("Got membership request with selfInfo that doesn't match the handshake")
return
}
}
g.forwardDiscoveryMsg(m)
}
if msg.IsPullMsg() && msg.GetPullMsgType() == proto.PullMsgType_IDENTITY_MSG {
g.certStore.handleMessage(m)
}
}
func (g *gossipServiceImpl) forwardDiscoveryMsg(msg proto.ReceivedMessage) {
defer func() { // can be closed while shutting down
recover()
}()
g.discAdapter.incChan <- msg.GetGossipMessage()
}
// validateMsg checks the signature of the message if exists,
// and also checks that the tag matches the message type
func (g *gossipServiceImpl) validateMsg(msg proto.ReceivedMessage) bool {
if err := msg.GetGossipMessage().IsTagLegal(); err != nil {
g.logger.Warning("Tag of", msg.GetGossipMessage(), "isn't legal:", err)
return false
}
if msg.GetGossipMessage().IsAliveMsg() {
if !g.disSecAdap.ValidateAliveMsg(msg.GetGossipMessage()) {
return false
}
}
if msg.GetGossipMessage().IsStateInfoMsg() {
if err := g.validateStateInfoMsg(msg.GetGossipMessage()); err != nil {
g.logger.Warning("StateInfo message", msg, "is found invalid:", err)
return false
}
}
return true
}
func (g *gossipServiceImpl) sendGossipBatch(a []interface{}) {
msgs2Gossip := make([]*proto.SignedGossipMessage, len(a))
for i, e := range a {
msgs2Gossip[i] = e.(*proto.SignedGossipMessage)
}
g.gossipBatch(msgs2Gossip)
}
// gossipBatch - This is the method that actually decides to which peers to gossip the message
// batch we possess.
// For efficiency, we first isolate all the messages that have the same routing policy
// and send them together, and only after that move to the next group of messages.
// i.e: we send all blocks of channel C to the same group of peers,
// and send all StateInfo messages to the same group of peers, etc. etc.
// When we send blocks, we send only to peers that advertised themselves in the channel.
// When we send StateInfo messages, we send to peers in the channel.
// When we send messages that are marked to be sent only within the org, we send all of these messages
// to the same set of peers.
// The rest of the messages that have no restrictions on their destinations can be sent
// to any group of peers.
func (g *gossipServiceImpl) gossipBatch(msgs []*proto.SignedGossipMessage) {
if g.disc == nil {
g.logger.Error("Discovery has not been initialized yet, aborting!")
return
}
var blocks []*proto.SignedGossipMessage
var stateInfoMsgs []*proto.SignedGossipMessage
var orgMsgs []*proto.SignedGossipMessage
var leadershipMsgs []*proto.SignedGossipMessage
isABlock := func(o interface{}) bool {
return o.(*proto.SignedGossipMessage).IsDataMsg()
}
isAStateInfoMsg := func(o interface{}) bool {
return o.(*proto.SignedGossipMessage).IsStateInfoMsg()
}
aliveMsgsWithNoEndpointAndInOurOrg := func(o interface{}) bool {
msg := o.(*proto.SignedGossipMessage)
if !msg.IsAliveMsg() {
return false
}
member := msg.GetAliveMsg().Membership
return member.Endpoint == "" && g.isInMyorg(discovery.NetworkMember{PKIid: member.PkiId})
}
isOrgRestricted := func(o interface{}) bool {
return aliveMsgsWithNoEndpointAndInOurOrg(o) || o.(*proto.SignedGossipMessage).IsOrgRestricted()
}
isLeadershipMsg := func(o interface{}) bool {
return o.(*proto.SignedGossipMessage).IsLeadershipMsg()
}
// Gossip blocks
blocks, msgs = partitionMessages(isABlock, msgs)
g.gossipInChan(blocks, func(gc channel.GossipChannel) filter.RoutingFilter {
return filter.CombineRoutingFilters(gc.EligibleForChannel, gc.IsMemberInChan, g.isInMyorg)
})
// Gossip Leadership messages
leadershipMsgs, msgs = partitionMessages(isLeadershipMsg, msgs)
g.gossipInChan(leadershipMsgs, func(gc channel.GossipChannel) filter.RoutingFilter {
return filter.CombineRoutingFilters(gc.EligibleForChannel, gc.IsMemberInChan, g.isInMyorg)
})
// Gossip StateInfo messages
stateInfoMsgs, msgs = partitionMessages(isAStateInfoMsg, msgs)
for _, stateInfMsg := range stateInfoMsgs {
peerSelector := g.isInMyorg
gc := g.chanState.lookupChannelForGossipMsg(stateInfMsg.GossipMessage)
if gc != nil && g.hasExternalEndpoint(stateInfMsg.GossipMessage.GetStateInfo().PkiId) {
peerSelector = gc.IsMemberInChan
}
peers2Send := filter.SelectPeers(g.conf.PropagatePeerNum, g.disc.GetMembership(), peerSelector)
g.comm.Send(stateInfMsg, peers2Send...)
}
// Gossip messages restricted to our org
orgMsgs, msgs = partitionMessages(isOrgRestricted, msgs)
peers2Send := filter.SelectPeers(g.conf.PropagatePeerNum, g.disc.GetMembership(), g.isInMyorg)
for _, msg := range orgMsgs {
g.comm.Send(msg, peers2Send...)
}
// Finally, gossip the remaining messages
for _, msg := range msgs {
if !msg.IsAliveMsg() {
g.logger.Error("Unknown message type", msg)
continue
}
selectByOriginOrg := g.peersByOriginOrgPolicy(discovery.NetworkMember{PKIid: msg.GetAliveMsg().Membership.PkiId})
peers2Send := filter.SelectPeers(g.conf.PropagatePeerNum, g.disc.GetMembership(), selectByOriginOrg)
g.sendAndFilterSecrets(msg, peers2Send...)
}
}
func (g *gossipServiceImpl) sendAndFilterSecrets(msg *proto.SignedGossipMessage, peers ...*comm.RemotePeer) {
for _, peer := range peers {
// Prevent forwarding alive messages of external organizations
// to peers that have no external endpoints
aliveMsgFromDiffOrg := msg.IsAliveMsg() && !g.isInMyorg(discovery.NetworkMember{PKIid: msg.GetAliveMsg().Membership.PkiId})
if aliveMsgFromDiffOrg && !g.hasExternalEndpoint(peer.PKIID) {
continue
}
// Don't gossip secrets
if !g.isInMyorg(discovery.NetworkMember{PKIid: peer.PKIID}) {
msg.Envelope.SecretEnvelope = nil
}
g.comm.Send(msg, peer)
}
}
// gossipInChan gossips a given GossipMessage slice according to a channel's routing policy.
func (g *gossipServiceImpl) gossipInChan(messages []*proto.SignedGossipMessage, chanRoutingFactory channelRoutingFilterFactory) {
if len(messages) == 0 {
return
}
totalChannels := extractChannels(messages)
var channel common.ChainID
var messagesOfChannel []*proto.SignedGossipMessage
for len(totalChannels) > 0 {
// Take first channel
channel, totalChannels = totalChannels[0], totalChannels[1:]
// Extract all messages of that channel
grabMsgs := func(o interface{}) bool {
return bytes.Equal(o.(*proto.SignedGossipMessage).Channel, channel)
}
messagesOfChannel, messages = partitionMessages(grabMsgs, messages)
if len(messagesOfChannel) == 0 {
continue
}
// Grab channel object for that channel
gc := g.chanState.getGossipChannelByChainID(channel)
if gc == nil {
g.logger.Warning("Channel", channel, "wasn't found")
continue
}
// Select the peers to send the messages to
// For leadership messages we will select all peers that pass routing factory - e.g. all peers in channel and org
membership := g.disc.GetMembership()
var peers2Send []*comm.RemotePeer
if messagesOfChannel[0].IsLeadershipMsg() {
peers2Send = filter.SelectPeers(len(membership), membership, chanRoutingFactory(gc))
} else {
peers2Send = filter.SelectPeers(g.conf.PropagatePeerNum, membership, chanRoutingFactory(gc))
}
// Send the messages to the remote peers
for _, msg := range messagesOfChannel {
g.comm.Send(msg, peers2Send...)
}
}
}
// Gossip sends a message to other peers to the network
func (g *gossipServiceImpl) Gossip(msg *proto.GossipMessage) {
// Educate developers to Gossip messages with the right tags.
// See IsTagLegal() for wanted behavior.
if err := msg.IsTagLegal(); err != nil {
panic(err)
}
sMsg := &proto.SignedGossipMessage{
GossipMessage: msg,
}
var err error
if sMsg.IsDataMsg() {
sMsg, err = sMsg.NoopSign()
} else {
_, err = sMsg.Sign(func(msg []byte) ([]byte, error) {
return g.mcs.Sign(msg)
})
}
if err != nil {
g.logger.Warning("Failed signing message:", err)
return
}
if msg.IsChannelRestricted() {
gc := g.chanState.getGossipChannelByChainID(msg.Channel)
if gc == nil {
g.logger.Warning("Failed obtaining gossipChannel of", msg.Channel, "aborting")
return
}
if msg.IsDataMsg() {
gc.AddToMsgStore(sMsg)
}
}
if g.conf.PropagateIterations == 0 {
return
}
g.emitter.Add(sMsg)
}
// Send sends a message to remote peers
func (g *gossipServiceImpl) Send(msg *proto.GossipMessage, peers ...*comm.RemotePeer) {
m, err := msg.NoopSign()
if err != nil {
g.logger.Warning("Failed creating SignedGossipMessage:", err)
return
}
g.comm.Send(m, peers...)
}
// GetPeers returns a mapping of endpoint --> []discovery.NetworkMember
func (g *gossipServiceImpl) Peers() []discovery.NetworkMember {
s := []discovery.NetworkMember{}
for _, member := range g.disc.GetMembership() {
s = append(s, member)
}
return s
}
// PeersOfChannel returns the NetworkMembers considered alive
// and also subscribed to the channel given
func (g *gossipServiceImpl) PeersOfChannel(channel common.ChainID) []discovery.NetworkMember {
gc := g.chanState.getGossipChannelByChainID(channel)
if gc == nil {
g.logger.Debug("No such channel", channel)
return nil
}
return gc.GetPeers()
}
// Stop stops the gossip component
func (g *gossipServiceImpl) Stop() {
if g.toDie() {
return
}
atomic.StoreInt32(&g.stopFlag, int32(1))
g.logger.Info("Stopping gossip")
comWG := sync.WaitGroup{}
comWG.Add(1)
go func() {
defer comWG.Done()
g.comm.Stop()
}()
g.chanState.stop()
g.discAdapter.close()
g.disc.Stop()
g.certStore.stop()
g.toDieChan <- struct{}{}
g.emitter.Stop()
g.ChannelDeMultiplexer.Close()
g.stateInfoMsgStore.Stop()
g.stopSignal.Wait()
comWG.Wait()
}
func (g *gossipServiceImpl) UpdateMetadata(md []byte) {
g.disc.UpdateMetadata(md)
}
// UpdateChannelMetadata updates the self metadata the peer
// publishes to other peers about its channel-related state
func (g *gossipServiceImpl) UpdateChannelMetadata(md []byte, chainID common.ChainID) {
gc := g.chanState.getGossipChannelByChainID(chainID)
if gc == nil {
g.logger.Debug("No such channel", chainID)
return
}
stateInfMsg, err := g.createStateInfoMsg(md, chainID)
if err != nil {
g.logger.Error("Failed creating StateInfo message")
return
}
gc.UpdateStateInfo(stateInfMsg)
}
// Accept returns a dedicated read-only channel for messages sent by other nodes that match a certain predicate.
// If passThrough is false, the messages are processed by the gossip layer beforehand.
// If passThrough is true, the gossip layer doesn't intervene and the messages
// can be used to send a reply back to the sender
func (g *gossipServiceImpl) Accept(acceptor common.MessageAcceptor, passThrough bool) (<-chan *proto.GossipMessage, <-chan proto.ReceivedMessage) {
if passThrough {
return nil, g.comm.Accept(acceptor)
}
acceptByType := func(o interface{}) bool {
if o, isGossipMsg := o.(*proto.GossipMessage); isGossipMsg {
return acceptor(o)
}
if o, isSignedMsg := o.(*proto.SignedGossipMessage); isSignedMsg {
sMsg := o
return acceptor(sMsg.GossipMessage)
}
g.logger.Warning("Message type:", reflect.TypeOf(o), "cannot be evaluated")
return false
}
inCh := g.AddChannel(acceptByType)
outCh := make(chan *proto.GossipMessage, acceptChanSize)
go func() {
for {
select {
case s := <-g.toDieChan:
g.toDieChan <- s
return
case m := <-inCh:
if m == nil {
return
}
outCh <- m.(*proto.SignedGossipMessage).GossipMessage
}
}
}()
return outCh, nil
}
func selectOnlyDiscoveryMessages(m interface{}) bool {
msg, isGossipMsg := m.(proto.ReceivedMessage)
if !isGossipMsg {
return false
}
alive := msg.GetGossipMessage().GetAliveMsg()
memRes := msg.GetGossipMessage().GetMemRes()
memReq := msg.GetGossipMessage().GetMemReq()
selected := alive != nil || memReq != nil || memRes != nil
return selected
}
func (g *gossipServiceImpl) newDiscoveryAdapter() *discoveryAdapter {
return &discoveryAdapter{
c: g.comm,
stopping: int32(0),
gossipFunc: func(msg *proto.SignedGossipMessage) {
if g.conf.PropagateIterations == 0 {
return
}
g.emitter.Add(msg)
},
incChan: make(chan *proto.SignedGossipMessage),
presumedDead: g.presumedDead,
disclosurePolicy: g.disclosurePolicy,
}
}
// discoveryAdapter is used to supply the discovery module with needed abilities
// that the comm interface in the discovery module declares
type discoveryAdapter struct {
stopping int32
c comm.Comm
presumedDead chan common.PKIidType
incChan chan *proto.SignedGossipMessage
gossipFunc func(message *proto.SignedGossipMessage)
disclosurePolicy discovery.DisclosurePolicy
}
func (da *discoveryAdapter) close() {
atomic.StoreInt32(&da.stopping, int32(1))
close(da.incChan)
}
func (da *discoveryAdapter) toDie() bool {
return atomic.LoadInt32(&da.stopping) == int32(1)
}
func (da *discoveryAdapter) Gossip(msg *proto.SignedGossipMessage) {
if da.toDie() {
return
}
da.gossipFunc(msg)
}
func (da *discoveryAdapter) SendToPeer(peer *discovery.NetworkMember, msg *proto.SignedGossipMessage) {
if da.toDie() {
return
}
// Check membership requests for peers that we know of their PKI-ID.
// The only peers we don't know about their PKI-IDs are bootstrap peers.
if memReq := msg.GetMemReq(); memReq != nil && len(peer.PKIid) != 0 {
selfMsg, err := memReq.SelfInformation.ToGossipMessage()
if err != nil {
// Shouldn't happen
panic("Tried to send a membership request with a malformed AliveMessage")
}
// Apply the EnvelopeFilter of the disclosure policy
// on the alive message of the selfInfo field of the membership request
_, omitConcealedFields := da.disclosurePolicy(peer)
selfMsg.Envelope = omitConcealedFields(selfMsg)
// Backup old known field
oldKnown := memReq.Known
// Override new SelfInfo message with updated envelope
memReq = &proto.MembershipRequest{
SelfInformation: selfMsg.Envelope,
Known: oldKnown,
}
// Update original message
msg.Content = &proto.GossipMessage_MemReq{
MemReq: memReq,
}
// Update the envelope of the outer message, no need to sign (point2point)
msg, err = msg.NoopSign()
if err != nil {
return
}
}
da.c.Send(msg, &comm.RemotePeer{PKIID: peer.PKIid, Endpoint: peer.PreferredEndpoint()})
}
func (da *discoveryAdapter) Ping(peer *discovery.NetworkMember) bool {
err := da.c.Probe(&comm.RemotePeer{Endpoint: peer.PreferredEndpoint(), PKIID: peer.PKIid})
return err == nil
}
func (da *discoveryAdapter) Accept() <-chan *proto.SignedGossipMessage {
return da.incChan
}
func (da *discoveryAdapter) PresumedDead() <-chan common.PKIidType {
return da.presumedDead
}
func (da *discoveryAdapter) CloseConn(peer *discovery.NetworkMember) {
da.c.CloseConn(&comm.RemotePeer{PKIID: peer.PKIid})
}
type discoverySecurityAdapter struct {
identity api.PeerIdentityType
includeIdentityPeriod time.Time
idMapper identity.Mapper
sa api.SecurityAdvisor
mcs api.MessageCryptoService
c comm.Comm
logger *logging.Logger
}
func (g *gossipServiceImpl) newDiscoverySecurityAdapter() *discoverySecurityAdapter {
return &discoverySecurityAdapter{
sa: g.secAdvisor,
idMapper: g.idMapper,
mcs: g.mcs,
c: g.comm,
logger: g.logger,
includeIdentityPeriod: g.includeIdentityPeriod,
identity: g.selfIdentity,
}
}
// validateAliveMsg validates that an Alive message is authentic
func (sa *discoverySecurityAdapter) ValidateAliveMsg(m *proto.SignedGossipMessage) bool {
am := m.GetAliveMsg()
if am == nil || am.Membership == nil || am.Membership.PkiId == nil || !m.IsSigned() {
sa.logger.Warning("Invalid alive message:", m)
return false
}
var identity api.PeerIdentityType
// If identity is included inside AliveMessage
if am.Identity != nil {
identity = api.PeerIdentityType(am.Identity)
claimedPKIID := am.Membership.PkiId
err := sa.idMapper.Put(claimedPKIID, identity)
if err != nil {
sa.logger.Warning("Failed validating identity of", am, "reason:", err)
return false
}
} else {
identity, _ = sa.idMapper.Get(am.Membership.PkiId)
if identity != nil {
sa.logger.Debug("Fetched identity of", am.Membership.PkiId, "from identity store")
}
}
if identity == nil {
sa.logger.Debug("Don't have certificate for", am)
return false
}
return sa.validateAliveMsgSignature(m, identity)
}
// SignMessage signs an AliveMessage and updates its signature field
func (sa *discoverySecurityAdapter) SignMessage(m *proto.GossipMessage, internalEndpoint string) *proto.Envelope {
signer := func(msg []byte) ([]byte, error) {
return sa.mcs.Sign(msg)
}
if m.IsAliveMsg() && time.Now().Before(sa.includeIdentityPeriod) {
m.GetAliveMsg().Identity = sa.identity
}
sMsg := &proto.SignedGossipMessage{
GossipMessage: m,
}
e, err := sMsg.Sign(signer)
if err != nil {
sa.logger.Warning("Failed signing message:", err)
return nil
}
if internalEndpoint == "" {
return e
}
e.SignSecret(signer, &proto.Secret{
Content: &proto.Secret_InternalEndpoint{
InternalEndpoint: internalEndpoint,
},
})
return e
}
func (sa *discoverySecurityAdapter) validateAliveMsgSignature(m *proto.SignedGossipMessage, identity api.PeerIdentityType) bool {
am := m.GetAliveMsg()
// At this point we got the certificate of the peer, proceed to verifying the AliveMessage
verifier := func(peerIdentity []byte, signature, message []byte) error {
return sa.mcs.Verify(api.PeerIdentityType(peerIdentity), signature, message)
}
// We verify the signature on the message
err := m.Verify(identity, verifier)
if err != nil {
sa.logger.Warning("Failed verifying:", am, ":", err)
return false
}
return true
}
func (g *gossipServiceImpl) createCertStorePuller() pull.Mediator {
conf := pull.Config{
MsgType: proto.PullMsgType_IDENTITY_MSG,
Channel: []byte(""),
ID: g.conf.InternalEndpoint,
PeerCountToSelect: g.conf.PullPeerNum,
PullInterval: g.conf.PullInterval,
Tag: proto.GossipMessage_EMPTY,
}
pkiIDFromMsg := func(msg *proto.SignedGossipMessage) string {
identityMsg := msg.GetPeerIdentity()
if identityMsg == nil || identityMsg.PkiId == nil {
return ""
}
return fmt.Sprintf("%s", string(identityMsg.PkiId))
}
certConsumer := func(msg *proto.SignedGossipMessage) {
idMsg := msg.GetPeerIdentity()
if idMsg == nil || idMsg.Cert == nil || idMsg.PkiId == nil {
g.logger.Warning("Invalid PeerIdentity:", idMsg)
return
}
err := g.idMapper.Put(common.PKIidType(idMsg.PkiId), api.PeerIdentityType(idMsg.Cert))
if err != nil {
g.logger.Warning("Failed associating PKI-ID with certificate:", err)
}
g.logger.Info("Learned of a new certificate:", idMsg.Cert)