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gossip_impl.go
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gossip_impl.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package gossip
import (
"bytes"
"fmt"
"net"
"reflect"
"sync"
"sync/atomic"
"time"
"github.com/golang/protobuf/proto"
pg "github.com/hyperledger/fabric-protos-go/gossip"
"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/algo"
"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/metrics"
"github.com/hyperledger/fabric/gossip/protoext"
"github.com/hyperledger/fabric/gossip/util"
"github.com/pkg/errors"
"google.golang.org/grpc"
)
const (
presumedDeadChanSize = 100
acceptChanSize = 100
)
type channelRoutingFilterFactory func(channel.GossipChannel) filter.RoutingFilter
// Node is a member of a gossip network
type Node struct {
selfIdentity api.PeerIdentityType
includeIdentityPeriod time.Time
certStore *certStore
idMapper identity.Mapper
presumedDead chan common.PKIidType
disc discovery.Discovery
comm comm.Comm
selfOrg api.OrgIdentityType
*comm.ChannelDeMultiplexer
logger util.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
certPuller pull.Mediator
gossipMetrics *metrics.GossipMetrics
}
// New creates a gossip instance attached to a gRPC server
func New(conf *Config, s *grpc.Server, sa api.SecurityAdvisor,
mcs api.MessageCryptoService, selfIdentity api.PeerIdentityType,
secureDialOpts api.PeerSecureDialOpts, gossipMetrics *metrics.GossipMetrics) *Node {
var err error
lgr := util.GetLogger(util.GossipLogger, conf.ID)
g := &Node{
selfOrg: sa.OrgByPeerIdentity(selfIdentity),
secAdvisor: sa,
selfIdentity: selfIdentity,
presumedDead: make(chan common.PKIidType, presumedDeadChanSize),
disc: nil,
mcs: mcs,
conf: conf,
ChannelDeMultiplexer: comm.NewChannelDemultiplexer(),
logger: lgr,
toDieChan: make(chan struct{}),
stopFlag: int32(0),
stopSignal: &sync.WaitGroup{},
includeIdentityPeriod: time.Now().Add(conf.PublishCertPeriod),
gossipMetrics: gossipMetrics,
}
g.stateInfoMsgStore = g.newStateInfoMsgStore()
g.idMapper = identity.NewIdentityMapper(mcs, selfIdentity, func(pkiID common.PKIidType, identity api.PeerIdentityType) {
g.comm.CloseConn(&comm.RemotePeer{PKIID: pkiID})
g.certPuller.Remove(string(pkiID))
}, sa)
commConfig := comm.CommConfig{
DialTimeout: conf.DialTimeout,
ConnTimeout: conf.ConnTimeout,
RecvBuffSize: conf.RecvBuffSize,
SendBuffSize: conf.SendBuffSize,
}
g.comm, err = comm.NewCommInstance(s, conf.TLSCerts, g.idMapper, selfIdentity, secureDialOpts, sa,
gossipMetrics.CommMetrics, commConfig)
if err != nil {
lgr.Error("Failed instntiating communication layer:", err)
return nil
}
g.chanState = newChannelState(g)
g.emitter = newBatchingEmitter(conf.PropagateIterations,
conf.MaxPropagationBurstSize, conf.MaxPropagationBurstLatency,
g.sendGossipBatch)
g.discAdapter = g.newDiscoveryAdapter()
g.disSecAdap = g.newDiscoverySecurityAdapter()
discoveryConfig := discovery.DiscoveryConfig{
AliveTimeInterval: conf.AliveTimeInterval,
AliveExpirationTimeout: conf.AliveExpirationTimeout,
AliveExpirationCheckInterval: conf.AliveExpirationCheckInterval,
ReconnectInterval: conf.ReconnectInterval,
BootstrapPeers: conf.BootstrapPeers,
}
g.disc = discovery.NewDiscoveryService(g.selfNetworkMember(), g.discAdapter, g.disSecAdap, g.disclosurePolicy,
discoveryConfig)
g.logger.Infof("Creating gossip service with self membership of %s", g.selfNetworkMember())
g.certPuller = g.createCertStorePuller()
g.certStore = newCertStore(g.certPuller, g.idMapper, selfIdentity, mcs)
if g.conf.ExternalEndpoint == "" {
g.logger.Warning("External endpoint is empty, peer will not be accessible outside of its organization")
}
// Adding delta for handlePresumedDead and
// acceptMessages goRoutines to block on Wait
g.stopSignal.Add(2)
go g.start()
go g.connect2BootstrapPeers()
return g
}
func (g *Node) newStateInfoMsgStore() msgstore.MessageStore {
pol := protoext.NewGossipMessageComparator(0)
return msgstore.NewMessageStoreExpirable(pol,
msgstore.Noop,
g.conf.PublishStateInfoInterval*100,
nil,
nil,
msgstore.Noop)
}
func (g *Node) 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 *Node) *channelState {
return &channelState{
stopping: int32(0),
channels: make(map[string]channel.GossipChannel),
g: g,
}
}
func (g *Node) toDie() bool {
return atomic.LoadInt32(&g.stopFlag) == int32(1)
}
// JoinChan makes gossip participate in the given channel, or update it.
func (g *Node) JoinChan(joinMsg api.JoinChannelMessage, channelID common.ChannelID) {
// joinMsg is supposed to have been already verified
g.chanState.joinChannel(joinMsg, channelID, g.gossipMetrics.MembershipMetrics)
g.logger.Info("Joining gossip network of channel", string(channelID), "with", len(joinMsg.Members()), "organizations")
for _, org := range joinMsg.Members() {
g.learnAnchorPeers(string(channelID), org, joinMsg.AnchorPeersOf(org))
}
}
// LeaveChan makes gossip stop participating in the given channel
func (g *Node) LeaveChan(channelID common.ChannelID) {
gc := g.chanState.getGossipChannelByChainID(channelID)
if gc == nil {
g.logger.Debug("No such channel", channelID)
return
}
gc.LeaveChannel()
}
// SuspectPeers makes the gossip instance validate identities of suspected peers, and close
// any connections to peers with identities that are found invalid
func (g *Node) SuspectPeers(isSuspected api.PeerSuspector) {
g.certStore.suspectPeers(isSuspected)
}
func (g *Node) learnAnchorPeers(channel string, orgOfAnchorPeers api.OrgIdentityType, anchorPeers []api.AnchorPeer) {
if len(anchorPeers) == 0 {
g.logger.Info("No configured anchor peers of", string(orgOfAnchorPeers), "for channel", channel, "to learn about")
return
}
g.logger.Info("Learning about the configured anchor peers of", string(orgOfAnchorPeers), "for channel", channel, ":", anchorPeers)
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 := net.JoinHostPort(ap.Host, fmt.Sprintf("%d", 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.Warningf("Deep probe of %s failed: %s", endpoint, err)
return nil, err
}
isAnchorPeerInMyOrg := bytes.Equal(g.selfOrg, g.secAdvisor.OrgByPeerIdentity(remotePeerIdentity))
if bytes.Equal(orgOfAnchorPeers, g.selfOrg) && !isAnchorPeerInMyOrg {
err := errors.Errorf("Anchor peer %s isn't in our org, but is claimed to be", endpoint)
g.logger.Warningf("%s", err)
return nil, err
}
pkiID := g.mcs.GetPKIidOfCert(remotePeerIdentity)
if len(pkiID) == 0 {
return nil, errors.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 *Node) handlePresumedDead() {
defer g.logger.Debug("Exiting")
defer g.stopSignal.Done()
for {
select {
case <-g.toDieChan:
return
case deadEndpoint := <-g.comm.PresumedDead():
g.presumedDead <- deadEndpoint
}
}
}
func (g *Node) 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 *Node) start() {
go g.syncDiscovery()
go g.handlePresumedDead()
msgSelector := func(msg interface{}) bool {
gMsg, isGossipMsg := msg.(protoext.ReceivedMessage)
if !isGossipMsg {
return false
}
isConn := gMsg.GetGossipMessage().GetConn() != nil
isEmpty := gMsg.GetGossipMessage().GetEmpty() != nil
isPrivateData := protoext.IsPrivateDataMsg(gMsg.GetGossipMessage().GossipMessage)
return !(isConn || isEmpty || isPrivateData)
}
incMsgs := g.comm.Accept(msgSelector)
go g.acceptMessages(incMsgs)
g.logger.Info("Gossip instance", g.conf.ID, "started")
}
func (g *Node) acceptMessages(incMsgs <-chan protoext.ReceivedMessage) {
defer g.logger.Debug("Exiting")
defer g.stopSignal.Done()
for {
select {
case <-g.toDieChan:
return
case msg := <-incMsgs:
g.handleMessage(msg)
}
}
}
func (g *Node) handleMessage(m protoext.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 protoext.IsChannelRestricted(msg.GossipMessage) {
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}) && protoext.IsStateInfoMsg(msg.GossipMessage) {
if g.stateInfoMsgStore.Add(msg) {
g.emitter.Add(&emittedGossipMessage{
SignedGossipMessage: msg,
filter: m.GetConnectionInfo().ID.IsNotSameFilter,
})
}
}
if !g.toDie() {
g.logger.Debug("No such channel", msg.Channel, "discarding message", msg)
}
} else {
if protoext.IsLeadershipMsg(m.GetGossipMessage().GossipMessage) {
if err := g.validateLeadershipMessage(m.GetGossipMessage()); err != nil {
g.logger.Warningf("Failed validating LeaderElection message: %+v", errors.WithStack(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 := protoext.EnvelopeToGossipMessage(m.GetGossipMessage().GetMemReq().SelfInformation)
if err != nil {
g.logger.Warningf("Got membership request with invalid selfInfo: %+v", errors.WithStack(err))
return
}
if !protoext.IsAliveMsg(sMsg.GossipMessage) {
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 protoext.IsPullMsg(msg.GossipMessage) && protoext.GetPullMsgType(msg.GossipMessage) == pg.PullMsgType_IDENTITY_MSG {
g.certStore.handleMessage(m)
}
}
func (g *Node) forwardDiscoveryMsg(msg protoext.ReceivedMessage) {
g.discAdapter.incChan <- msg
}
// validateMsg checks the signature of the message if exists,
// and also checks that the tag matches the message type
func (g *Node) validateMsg(msg protoext.ReceivedMessage) bool {
if err := protoext.IsTagLegal(msg.GetGossipMessage().GossipMessage); err != nil {
g.logger.Warningf("Tag of %v isn't legal: %v", msg.GetGossipMessage(), errors.WithStack(err))
return false
}
if protoext.IsStateInfoMsg(msg.GetGossipMessage().GossipMessage) {
if err := g.validateStateInfoMsg(msg.GetGossipMessage()); err != nil {
g.logger.Warningf("StateInfo message %v is found invalid: %v", msg, err)
return false
}
}
return true
}
func (g *Node) sendGossipBatch(a []interface{}) {
msgs2Gossip := make([]*emittedGossipMessage, len(a))
for i, e := range a {
msgs2Gossip[i] = e.(*emittedGossipMessage)
}
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 *Node) gossipBatch(msgs []*emittedGossipMessage) {
if g.disc == nil {
g.logger.Error("Discovery has not been initialized yet, aborting!")
return
}
var blocks []*emittedGossipMessage
var stateInfoMsgs []*emittedGossipMessage
var orgMsgs []*emittedGossipMessage
var leadershipMsgs []*emittedGossipMessage
isABlock := func(o interface{}) bool {
return protoext.IsDataMsg(o.(*emittedGossipMessage).GossipMessage)
}
isAStateInfoMsg := func(o interface{}) bool {
return protoext.IsStateInfoMsg(o.(*emittedGossipMessage).GossipMessage)
}
aliveMsgsWithNoEndpointAndInOurOrg := func(o interface{}) bool {
msg := o.(*emittedGossipMessage)
if !protoext.IsAliveMsg(msg.GossipMessage) {
return false
}
member := msg.GetAliveMsg().Membership
return member.Endpoint == "" && g.IsInMyOrg(discovery.NetworkMember{PKIid: member.PkiId})
}
isOrgRestricted := func(o interface{}) bool {
return aliveMsgsWithNoEndpointAndInOurOrg(o) || protoext.IsOrgRestricted(o.(*emittedGossipMessage).GossipMessage)
}
isLeadershipMsg := func(o interface{}) bool {
return protoext.IsLeadershipMsg(o.(*emittedGossipMessage).GossipMessage)
}
// 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
}
peerSelector = filter.CombineRoutingFilters(peerSelector, func(member discovery.NetworkMember) bool {
return stateInfMsg.filter(member.PKIid)
})
peers2Send := filter.SelectPeers(g.conf.PropagatePeerNum, g.disc.GetMembership(), peerSelector)
g.comm.Send(stateInfMsg.SignedGossipMessage, 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.SignedGossipMessage, g.removeSelfLoop(msg, peers2Send)...)
}
// Finally, gossip the remaining messages
for _, msg := range msgs {
if !protoext.IsAliveMsg(msg.GossipMessage) {
g.logger.Error("Unknown message type", msg)
continue
}
selectByOriginOrg := g.peersByOriginOrgPolicy(discovery.NetworkMember{PKIid: msg.GetAliveMsg().Membership.PkiId})
selector := filter.CombineRoutingFilters(selectByOriginOrg, func(member discovery.NetworkMember) bool {
return msg.filter(member.PKIid)
})
peers2Send := filter.SelectPeers(g.conf.PropagatePeerNum, g.disc.GetMembership(), selector)
g.sendAndFilterSecrets(msg.SignedGossipMessage, peers2Send...)
}
}
func (g *Node) sendAndFilterSecrets(msg *protoext.SignedGossipMessage, peers ...*comm.RemotePeer) {
for _, peer := range peers {
// Prevent forwarding alive messages of external organizations
// to peers that have no external endpoints
aliveMsgFromDiffOrg := protoext.IsAliveMsg(msg.GossipMessage) && !g.IsInMyOrg(discovery.NetworkMember{PKIid: msg.GetAliveMsg().Membership.PkiId})
if aliveMsgFromDiffOrg && !g.hasExternalEndpoint(peer.PKIID) {
continue
}
// Use cloned message to filter secrets to avoid data races when same message is sent multiple times
clonedMsg := &protoext.SignedGossipMessage{}
clonedMsg.GossipMessage = msg.GossipMessage
clonedMsg.Envelope = msg.Envelope
// Don't gossip secrets
if !g.IsInMyOrg(discovery.NetworkMember{PKIid: peer.PKIID}) {
clonedMsg.Envelope = proto.Clone(msg.Envelope).(*pg.Envelope) // clone the envelope
clonedMsg.Envelope.SecretEnvelope = nil
}
g.comm.Send(clonedMsg, peer)
}
}
// gossipInChan gossips a given GossipMessage slice according to a channel's routing policy.
func (g *Node) gossipInChan(messages []*emittedGossipMessage, chanRoutingFactory channelRoutingFilterFactory) {
if len(messages) == 0 {
return
}
totalChannels := extractChannels(messages)
var channel common.ChannelID
var messagesOfChannel []*emittedGossipMessage
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.(*emittedGossipMessage).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 protoext.IsLeadershipMsg(messagesOfChannel[0].GossipMessage) {
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 {
filteredPeers := g.removeSelfLoop(msg, peers2Send)
g.comm.Send(msg.SignedGossipMessage, filteredPeers...)
}
}
}
// removeSelfLoop deletes from the list of peers peer which has sent the message
func (g *Node) removeSelfLoop(msg *emittedGossipMessage, peers []*comm.RemotePeer) []*comm.RemotePeer {
var result []*comm.RemotePeer
for _, peer := range peers {
if msg.filter(peer.PKIID) {
result = append(result, peer)
}
}
return result
}
// IdentityInfo returns information known peer identities
func (g *Node) IdentityInfo() api.PeerIdentitySet {
return g.idMapper.IdentityInfo()
}
// SendByCriteria sends a given message to all peers that match the given SendCriteria
func (g *Node) SendByCriteria(msg *protoext.SignedGossipMessage, criteria SendCriteria) error {
if criteria.MaxPeers == 0 {
return nil
}
if criteria.Timeout == 0 {
return errors.New("Timeout should be specified")
}
if criteria.IsEligible == nil {
criteria.IsEligible = filter.SelectAllPolicy
}
membership := g.disc.GetMembership()
if len(criteria.Channel) > 0 {
gc := g.chanState.getGossipChannelByChainID(criteria.Channel)
if gc == nil {
return fmt.Errorf("Requested to Send for channel %s, but no such channel exists", string(criteria.Channel))
}
membership = gc.GetPeers()
}
peers2send := filter.SelectPeers(criteria.MaxPeers, membership, criteria.IsEligible)
if len(peers2send) < criteria.MinAck {
return fmt.Errorf("Requested to send to at least %d peers, but know only of %d suitable peers", criteria.MinAck, len(peers2send))
}
results := g.comm.SendWithAck(msg, criteria.Timeout, criteria.MinAck, peers2send...)
for _, res := range results {
if res.Error() == "" {
continue
}
g.logger.Warning("Failed sending to", res.Endpoint, "error:", res.Error())
}
if results.AckCount() < criteria.MinAck {
return errors.New(results.String())
}
return nil
}
// Gossip sends a message to other peers to the network
func (g *Node) Gossip(msg *pg.GossipMessage) {
// Educate developers to Gossip messages with the right tags.
// See IsTagLegal() for wanted behavior.
if err := protoext.IsTagLegal(msg); err != nil {
panic(errors.WithStack(err))
}
sMsg := &protoext.SignedGossipMessage{
GossipMessage: msg,
}
var err error
if protoext.IsDataMsg(sMsg.GossipMessage) {
sMsg, err = protoext.NoopSign(sMsg.GossipMessage)
} else {
_, err = sMsg.Sign(func(msg []byte) ([]byte, error) {
return g.mcs.Sign(msg)
})
}
if err != nil {
g.logger.Warningf("Failed signing message: %+v", errors.WithStack(err))
return
}
if protoext.IsChannelRestricted(msg) {
gc := g.chanState.getGossipChannelByChainID(msg.Channel)
if gc == nil {
g.logger.Warning("Failed obtaining gossipChannel of", msg.Channel, "aborting")
return
}
if protoext.IsDataMsg(msg) {
gc.AddToMsgStore(sMsg)
}
}
if g.conf.PropagateIterations == 0 {
return
}
g.emitter.Add(&emittedGossipMessage{
SignedGossipMessage: sMsg,
filter: func(_ common.PKIidType) bool {
return true
},
})
}
// Send sends a message to remote peers
func (g *Node) Send(msg *pg.GossipMessage, peers ...*comm.RemotePeer) {
m, err := protoext.NoopSign(msg)
if err != nil {
g.logger.Warningf("Failed creating SignedGossipMessage: %+v", errors.WithStack(err))
return
}
g.comm.Send(m, peers...)
}
// Peers returns the current alive NetworkMembers
func (g *Node) Peers() []discovery.NetworkMember {
return g.disc.GetMembership()
}
// PeersOfChannel returns the NetworkMembers considered alive
// and also subscribed to the channel given
func (g *Node) PeersOfChannel(channel common.ChannelID) []discovery.NetworkMember {
gc := g.chanState.getGossipChannelByChainID(channel)
if gc == nil {
g.logger.Debug("No such channel", channel)
return nil
}
return gc.GetPeers()
}
// SelfMembershipInfo returns the peer's membership information
func (g *Node) SelfMembershipInfo() discovery.NetworkMember {
return g.disc.Self()
}
// SelfChannelInfo returns the peer's latest StateInfo message of a given channel
func (g *Node) SelfChannelInfo(chain common.ChannelID) *protoext.SignedGossipMessage {
ch := g.chanState.getGossipChannelByChainID(chain)
if ch == nil {
return nil
}
return ch.Self()
}
// PeerFilter receives a SubChannelSelectionCriteria and returns a RoutingFilter that selects
// only peer identities that match the given criteria, and that they published their channel participation
func (g *Node) PeerFilter(channel common.ChannelID, messagePredicate api.SubChannelSelectionCriteria) (filter.RoutingFilter, error) {
gc := g.chanState.getGossipChannelByChainID(channel)
if gc == nil {
return nil, errors.Errorf("Channel %s doesn't exist", string(channel))
}
return gc.PeerFilter(messagePredicate), nil
}
// Stop stops the gossip component
func (g *Node) Stop() {
if g.toDie() {
return
}
atomic.StoreInt32(&g.stopFlag, int32(1))
g.logger.Info("Stopping gossip")
close(g.toDieChan)
g.stopSignal.Wait()
g.chanState.stop()
g.discAdapter.close()
g.disc.Stop()
g.certStore.stop()
g.emitter.Stop()
g.ChannelDeMultiplexer.Close()
g.stateInfoMsgStore.Stop()
g.comm.Stop()
}
// UpdateMetadata updates gossip membership metadata.
func (g *Node) UpdateMetadata(md []byte) {
g.disc.UpdateMetadata(md)
}
// UpdateLedgerHeight updates the ledger height the peer
// publishes to other peers in the channel
func (g *Node) UpdateLedgerHeight(height uint64, channelID common.ChannelID) {
gc := g.chanState.getGossipChannelByChainID(channelID)
if gc == nil {
g.logger.Warning("No such channel", channelID)
return
}
gc.UpdateLedgerHeight(height)
}
// UpdateChaincodes updates the chaincodes the peer publishes
// to other peers in the channel
func (g *Node) UpdateChaincodes(chaincodes []*pg.Chaincode, channelID common.ChannelID) {
gc := g.chanState.getGossipChannelByChainID(channelID)
if gc == nil {
g.logger.Warning("No such channel", channelID)
return
}
gc.UpdateChaincodes(chaincodes)
}
// 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 *Node) Accept(acceptor common.MessageAcceptor, passThrough bool) (<-chan *pg.GossipMessage, <-chan protoext.ReceivedMessage) {
if passThrough {
return nil, g.comm.Accept(acceptor)
}
acceptByType := func(o interface{}) bool {
if o, isGossipMsg := o.(*pg.GossipMessage); isGossipMsg {
return acceptor(o)
}
if o, isSignedMsg := o.(*protoext.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 *pg.GossipMessage, acceptChanSize)
go func() {
defer close(outCh)
for {
select {
case <-g.toDieChan:
return
case m, channelOpen := <-inCh:
if !channelOpen {
return
}
select {
case <-g.toDieChan:
return
case outCh <- m.(*protoext.SignedGossipMessage).GossipMessage:
}
}
}
}()
return outCh, nil
}
func selectOnlyDiscoveryMessages(m interface{}) bool {
msg, isGossipMsg := m.(protoext.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 *Node) newDiscoveryAdapter() *discoveryAdapter {
return &discoveryAdapter{
c: g.comm,
stopping: int32(0),
gossipFunc: func(msg *protoext.SignedGossipMessage) {
if g.conf.PropagateIterations == 0 {
return
}
g.emitter.Add(&emittedGossipMessage{
SignedGossipMessage: msg,
filter: func(_ common.PKIidType) bool {
return true
},
})
},
forwardFunc: func(message protoext.ReceivedMessage) {
if g.conf.PropagateIterations == 0 {
return
}
g.emitter.Add(&emittedGossipMessage{
SignedGossipMessage: message.GetGossipMessage(),
filter: message.GetConnectionInfo().ID.IsNotSameFilter,
})
},
incChan: make(chan protoext.ReceivedMessage),
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 protoext.ReceivedMessage
gossipFunc func(message *protoext.SignedGossipMessage)
forwardFunc func(message protoext.ReceivedMessage)
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 *protoext.SignedGossipMessage) {
if da.toDie() {
return
}
da.gossipFunc(msg)
}
func (da *discoveryAdapter) Forward(msg protoext.ReceivedMessage) {
if da.toDie() {
return
}
da.forwardFunc(msg)
}
func (da *discoveryAdapter) SendToPeer(peer *discovery.NetworkMember, msg *protoext.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 := protoext.EnvelopeToGossipMessage(memReq.SelfInformation)
if err != nil {
// Shouldn't happen
panic(errors.Wrapf(err, "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 = &pg.MembershipRequest{
SelfInformation: selfMsg.Envelope,
Known: oldKnown,
}
msgCopy := proto.Clone(msg.GossipMessage).(*pg.GossipMessage)
// Update original message
msgCopy.Content = &pg.GossipMessage_MemReq{
MemReq: memReq,
}
// Update the envelope of the outer message, no need to sign (point2point)
msg, err = protoext.NoopSign(msgCopy)
if err != nil {
return
}
da.c.Send(msg, &comm.RemotePeer{PKIID: peer.PKIid, Endpoint: peer.PreferredEndpoint()})
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 protoext.ReceivedMessage {
return da.incChan
}
func (da *discoveryAdapter) PresumedDead() <-chan common.PKIidType {
return da.presumedDead
}
func (da *discoveryAdapter) IdentitySwitch() <-chan common.PKIidType {
return da.c.IdentitySwitch()
}
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 util.Logger
}
func (g *Node) 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 *protoext.SignedGossipMessage) bool {
am := m.GetAliveMsg()
if am == nil || am.Membership == nil || am.Membership.PkiId == nil || !m.IsSigned() {