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channel.go
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channel.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package channel
import (
"bytes"
"fmt"
"strconv"
"sync"
"sync/atomic"
"time"
common_utils "github.com/hyperledger/fabric/common/util"
"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/election"
"github.com/hyperledger/fabric/gossip/filter"
"github.com/hyperledger/fabric/gossip/gossip/msgstore"
"github.com/hyperledger/fabric/gossip/gossip/pull"
"github.com/hyperledger/fabric/gossip/util"
proto "github.com/hyperledger/fabric/protos/gossip"
"github.com/op/go-logging"
"github.com/pkg/errors"
)
// Config is a configuration item
// of the channel store
type Config struct {
ID string
PublishStateInfoInterval time.Duration
MaxBlockCountToStore int
PullPeerNum int
PullInterval time.Duration
RequestStateInfoInterval time.Duration
BlockExpirationInterval time.Duration
StateInfoCacheSweepInterval time.Duration
}
// GossipChannel defines an object that deals with all channel-related messages
type GossipChannel interface {
// GetPeers returns a list of peers with metadata as published by them
GetPeers() []discovery.NetworkMember
// PeerFilter receives a SubChannelSelectionCriteria and returns a RoutingFilter that selects
// only peer identities that match the given criteria
PeerFilter(api.SubChannelSelectionCriteria) filter.RoutingFilter
// IsMemberInChan checks whether the given member is eligible to be in the channel
IsMemberInChan(member discovery.NetworkMember) bool
// UpdateStateInfo updates this channel's StateInfo message
// that is periodically published
UpdateStateInfo(msg *proto.SignedGossipMessage)
// IsOrgInChannel returns whether the given organization is in the channel
IsOrgInChannel(membersOrg api.OrgIdentityType) bool
// EligibleForChannel returns whether the given member should get blocks
// for this channel
EligibleForChannel(member discovery.NetworkMember) bool
// HandleMessage processes a message sent by a remote peer
HandleMessage(proto.ReceivedMessage)
// AddToMsgStore adds a given GossipMessage to the message store
AddToMsgStore(msg *proto.SignedGossipMessage)
// ConfigureChannel (re)configures the list of organizations
// that are eligible to be in the channel
ConfigureChannel(joinMsg api.JoinChannelMessage)
// LeaveChannel makes the peer leave the channel
LeaveChannel()
// Stop stops the channel's activity
Stop()
}
// Adapter enables the gossipChannel
// to communicate with gossipServiceImpl.
type Adapter interface {
// GetConf returns the configuration that this GossipChannel will posses
GetConf() Config
// Gossip gossips a message in the channel
Gossip(message *proto.SignedGossipMessage)
// Forward sends a message to the next hops
Forward(message proto.ReceivedMessage)
// DeMultiplex de-multiplexes an item to subscribers
DeMultiplex(interface{})
// GetMembership returns the known alive peers and their information
GetMembership() []discovery.NetworkMember
// Lookup returns a network member, or nil if not found
Lookup(PKIID common.PKIidType) *discovery.NetworkMember
// Send sends a message to a list of peers
Send(msg *proto.SignedGossipMessage, peers ...*comm.RemotePeer)
// ValidateStateInfoMessage returns an error if a message
// hasn't been signed correctly, nil otherwise.
ValidateStateInfoMessage(message *proto.SignedGossipMessage) error
// GetOrgOfPeer returns the organization ID of a given peer PKI-ID
GetOrgOfPeer(pkiID common.PKIidType) api.OrgIdentityType
// GetIdentityByPKIID returns an identity of a peer with a certain
// pkiID, or nil if not found
GetIdentityByPKIID(pkiID common.PKIidType) api.PeerIdentityType
}
type gossipChannel struct {
Adapter
sync.RWMutex
shouldGossipStateInfo int32
mcs api.MessageCryptoService
pkiID common.PKIidType
selfOrg api.OrgIdentityType
stopChan chan struct{}
stateInfoMsg *proto.SignedGossipMessage
orgs []api.OrgIdentityType
joinMsg api.JoinChannelMessage
blockMsgStore msgstore.MessageStore
stateInfoMsgStore *stateInfoCache
leaderMsgStore msgstore.MessageStore
chainID common.ChainID
blocksPuller pull.Mediator
logger *logging.Logger
stateInfoPublishScheduler *time.Ticker
stateInfoRequestScheduler *time.Ticker
memFilter *membershipFilter
ledgerHeight uint64
leftChannel int32
}
type membershipFilter struct {
adapter Adapter
*gossipChannel
}
// GetMembership returns the known alive peers and their information
func (mf *membershipFilter) GetMembership() []discovery.NetworkMember {
if mf.hasLeftChannel() {
return nil
}
var members []discovery.NetworkMember
for _, mem := range mf.adapter.GetMembership() {
if mf.eligibleForChannelAndSameOrg(mem) {
members = append(members, mem)
}
}
return members
}
// NewGossipChannel creates a new GossipChannel
func NewGossipChannel(pkiID common.PKIidType, org api.OrgIdentityType, mcs api.MessageCryptoService,
chainID common.ChainID, adapter Adapter, joinMsg api.JoinChannelMessage) GossipChannel {
gc := &gossipChannel{
selfOrg: org,
pkiID: pkiID,
mcs: mcs,
Adapter: adapter,
logger: util.GetLogger(util.LoggingChannelModule, adapter.GetConf().ID),
stopChan: make(chan struct{}, 1),
shouldGossipStateInfo: int32(0),
stateInfoPublishScheduler: time.NewTicker(adapter.GetConf().PublishStateInfoInterval),
stateInfoRequestScheduler: time.NewTicker(adapter.GetConf().RequestStateInfoInterval),
orgs: []api.OrgIdentityType{},
chainID: chainID,
}
gc.memFilter = &membershipFilter{adapter: gc.Adapter, gossipChannel: gc}
comparator := proto.NewGossipMessageComparator(adapter.GetConf().MaxBlockCountToStore)
gc.blocksPuller = gc.createBlockPuller()
seqNumFromMsg := func(m interface{}) string {
return fmt.Sprintf("%d", m.(*proto.SignedGossipMessage).GetDataMsg().Payload.SeqNum)
}
gc.blockMsgStore = msgstore.NewMessageStoreExpirable(comparator, func(m interface{}) {
gc.blocksPuller.Remove(seqNumFromMsg(m))
}, gc.GetConf().BlockExpirationInterval, nil, nil, func(m interface{}) {
gc.blocksPuller.Remove(seqNumFromMsg(m))
})
hashPeerExpiredInMembership := func(o interface{}) bool {
pkiID := o.(*proto.SignedGossipMessage).GetStateInfo().PkiId
return gc.Lookup(pkiID) == nil
}
verifyStateInfoMsg := func(msg *proto.SignedGossipMessage, orgs ...api.OrgIdentityType) bool {
si := msg.GetStateInfo()
// No point in verifying ourselves
if bytes.Equal(gc.pkiID, si.PkiId) {
return true
}
peerIdentity := adapter.GetIdentityByPKIID(si.PkiId)
if len(peerIdentity) == 0 {
gc.logger.Warning("Identity for peer", si.PkiId, "doesn't exist")
return false
}
isOrgInChan := func(org api.OrgIdentityType) bool {
if len(orgs) == 0 {
if !gc.IsOrgInChannel(org) {
return false
}
} else {
found := false
for _, chanMember := range orgs {
if bytes.Equal(chanMember, org) {
found = true
break
}
}
if !found {
return false
}
}
return true
}
org := gc.GetOrgOfPeer(si.PkiId)
if !isOrgInChan(org) {
gc.logger.Warning("peer", peerIdentity, "'s organization(", string(org), ") isn't in the channel", string(chainID))
return false
}
if err := gc.mcs.VerifyByChannel(chainID, peerIdentity, msg.Signature, msg.Payload); err != nil {
gc.logger.Warningf("Peer %v isn't eligible for channel %s : %+v", peerIdentity, string(chainID), errors.WithStack(err))
return false
}
return true
}
gc.stateInfoMsgStore = newStateInfoCache(gc.GetConf().StateInfoCacheSweepInterval, hashPeerExpiredInMembership, verifyStateInfoMsg)
ttl := election.GetMsgExpirationTimeout()
pol := proto.NewGossipMessageComparator(0)
gc.leaderMsgStore = msgstore.NewMessageStoreExpirable(pol, msgstore.Noop, ttl, nil, nil, nil)
gc.ConfigureChannel(joinMsg)
// Periodically publish state info
go gc.periodicalInvocation(gc.publishStateInfo, gc.stateInfoPublishScheduler.C)
// Periodically request state info
go gc.periodicalInvocation(gc.requestStateInfo, gc.stateInfoRequestScheduler.C)
return gc
}
// Stop stop the channel operations
func (gc *gossipChannel) Stop() {
gc.stopChan <- struct{}{}
gc.blocksPuller.Stop()
gc.stateInfoPublishScheduler.Stop()
gc.stateInfoRequestScheduler.Stop()
gc.leaderMsgStore.Stop()
gc.stateInfoMsgStore.Stop()
gc.blockMsgStore.Stop()
}
func (gc *gossipChannel) periodicalInvocation(fn func(), c <-chan time.Time) {
for {
select {
case <-c:
fn()
case <-gc.stopChan:
gc.stopChan <- struct{}{}
return
}
}
}
// LeaveChannel makes the peer leave the channel
func (gc *gossipChannel) LeaveChannel() {
atomic.StoreInt32(&gc.leftChannel, 1)
}
func (gc *gossipChannel) hasLeftChannel() bool {
return atomic.LoadInt32(&gc.leftChannel) == 1
}
// GetPeers returns a list of peers with metadata as published by them
func (gc *gossipChannel) GetPeers() []discovery.NetworkMember {
members := []discovery.NetworkMember{}
if gc.hasLeftChannel() {
return members
}
for _, member := range gc.GetMembership() {
if !gc.EligibleForChannel(member) {
continue
}
stateInf := gc.stateInfoMsgStore.MsgByID(member.PKIid)
if stateInf == nil {
continue
}
props := stateInf.GetStateInfo().Properties
if props != nil && props.LeftChannel {
continue
}
member.Metadata = stateInf.GetStateInfo().Metadata
member.Properties = stateInf.GetStateInfo().Properties
members = append(members, member)
}
return members
}
func (gc *gossipChannel) requestStateInfo() {
req, err := gc.createStateInfoRequest()
if err != nil {
gc.logger.Warningf("Failed creating SignedGossipMessage: %+v", errors.WithStack(err))
return
}
endpoints := filter.SelectPeers(gc.GetConf().PullPeerNum, gc.GetMembership(), gc.IsMemberInChan)
gc.Send(req, endpoints...)
}
func (gc *gossipChannel) eligibleForChannelAndSameOrg(member discovery.NetworkMember) bool {
sameOrg := func(networkMember discovery.NetworkMember) bool {
return bytes.Equal(gc.GetOrgOfPeer(networkMember.PKIid), gc.selfOrg)
}
return filter.CombineRoutingFilters(gc.EligibleForChannel, sameOrg)(member)
}
func (gc *gossipChannel) publishStateInfo() {
if atomic.LoadInt32(&gc.shouldGossipStateInfo) == int32(0) {
return
}
gc.RLock()
stateInfoMsg := gc.stateInfoMsg
gc.RUnlock()
gc.Gossip(stateInfoMsg)
if len(gc.GetMembership()) > 0 {
atomic.StoreInt32(&gc.shouldGossipStateInfo, int32(0))
}
}
func (gc *gossipChannel) createBlockPuller() pull.Mediator {
conf := pull.Config{
MsgType: proto.PullMsgType_BLOCK_MSG,
Channel: []byte(gc.chainID),
ID: gc.GetConf().ID,
PeerCountToSelect: gc.GetConf().PullPeerNum,
PullInterval: gc.GetConf().PullInterval,
Tag: proto.GossipMessage_CHAN_AND_ORG,
}
seqNumFromMsg := func(msg *proto.SignedGossipMessage) string {
dataMsg := msg.GetDataMsg()
if dataMsg == nil || dataMsg.Payload == nil {
gc.logger.Warning("Non-data block or with no payload")
return ""
}
return fmt.Sprintf("%d", dataMsg.Payload.SeqNum)
}
adapter := &pull.PullAdapter{
Sndr: gc,
MemSvc: gc.memFilter,
IdExtractor: seqNumFromMsg,
MsgCons: func(msg *proto.SignedGossipMessage) {
gc.DeMultiplex(msg)
},
}
adapter.IngressDigFilter = func(digestMsg *proto.DataDigest) *proto.DataDigest {
gc.RLock()
height := gc.ledgerHeight
gc.RUnlock()
digests := digestMsg.Digests
digestMsg.Digests = nil
for i := range digests {
seqNum, err := strconv.ParseUint(digests[i], 10, 64)
if err != nil {
gc.logger.Warningf("Can't parse digest %s : %+v", digests[i], errors.WithStack(err))
continue
}
if seqNum >= height {
digestMsg.Digests = append(digestMsg.Digests, digests[i])
}
}
return digestMsg
}
return pull.NewPullMediator(conf, adapter)
}
// IsMemberInChan checks whether the given member is eligible to be in the channel
func (gc *gossipChannel) IsMemberInChan(member discovery.NetworkMember) bool {
org := gc.GetOrgOfPeer(member.PKIid)
if org == nil {
return false
}
return gc.IsOrgInChannel(org)
}
// PeerFilter receives a SubChannelSelectionCriteria and returns a RoutingFilter that selects
// only peer identities that match the given criteria
func (gc *gossipChannel) PeerFilter(messagePredicate api.SubChannelSelectionCriteria) filter.RoutingFilter {
return func(member discovery.NetworkMember) bool {
peerIdentity := gc.GetIdentityByPKIID(member.PKIid)
if len(peerIdentity) == 0 {
return false
}
msg := gc.stateInfoMsgStore.MembershipStore.MsgByID(member.PKIid)
if msg == nil {
return false
}
return messagePredicate(api.PeerSignature{
Message: msg.Payload,
Signature: msg.Signature,
PeerIdentity: peerIdentity,
})
}
}
// IsOrgInChannel returns whether the given organization is in the channel
func (gc *gossipChannel) IsOrgInChannel(membersOrg api.OrgIdentityType) bool {
gc.RLock()
defer gc.RUnlock()
for _, orgOfChan := range gc.orgs {
if bytes.Equal(orgOfChan, membersOrg) {
return true
}
}
return false
}
// EligibleForChannel returns whether the given member should get blocks
// for this channel
func (gc *gossipChannel) EligibleForChannel(member discovery.NetworkMember) bool {
peerIdentity := gc.GetIdentityByPKIID(member.PKIid)
if len(peerIdentity) == 0 {
gc.logger.Warning("Identity for peer", member.PKIid, "doesn't exist")
return false
}
msg := gc.stateInfoMsgStore.MsgByID(member.PKIid)
if msg == nil {
return false
}
return true
}
// AddToMsgStore adds a given GossipMessage to the message store
func (gc *gossipChannel) AddToMsgStore(msg *proto.SignedGossipMessage) {
if msg.IsDataMsg() {
gc.blockMsgStore.Add(msg)
gc.blocksPuller.Add(msg)
}
if msg.IsStateInfoMsg() {
gc.stateInfoMsgStore.Add(msg)
}
}
// ConfigureChannel (re)configures the list of organizations
// that are eligible to be in the channel
func (gc *gossipChannel) ConfigureChannel(joinMsg api.JoinChannelMessage) {
gc.Lock()
defer gc.Unlock()
if len(joinMsg.Members()) == 0 {
gc.logger.Warning("Received join channel message with empty set of members")
return
}
if gc.joinMsg == nil {
gc.joinMsg = joinMsg
}
if gc.joinMsg.SequenceNumber() > (joinMsg.SequenceNumber()) {
gc.logger.Warning("Already have a more updated JoinChannel message(", gc.joinMsg.SequenceNumber(), ") than", joinMsg.SequenceNumber())
return
}
gc.orgs = joinMsg.Members()
gc.joinMsg = joinMsg
gc.stateInfoMsgStore.validate(joinMsg.Members())
}
// HandleMessage processes a message sent by a remote peer
func (gc *gossipChannel) HandleMessage(msg proto.ReceivedMessage) {
if !gc.verifyMsg(msg) {
gc.logger.Warning("Failed verifying message:", msg.GetGossipMessage().GossipMessage)
return
}
m := msg.GetGossipMessage()
if !m.IsChannelRestricted() {
gc.logger.Warning("Got message", msg.GetGossipMessage(), "but it's not a per-channel message, discarding it")
return
}
orgID := gc.GetOrgOfPeer(msg.GetConnectionInfo().ID)
if len(orgID) == 0 {
gc.logger.Debug("Couldn't find org identity of peer", msg.GetConnectionInfo())
return
}
if !gc.IsOrgInChannel(orgID) {
gc.logger.Warning("Point to point message came from", msg.GetConnectionInfo(),
", org(", string(orgID), ") but it's not eligible for the channel", string(gc.chainID))
return
}
if m.IsStateInfoPullRequestMsg() {
msg.Respond(gc.createStateInfoSnapshot(orgID))
return
}
if m.IsStateInfoSnapshot() {
gc.handleStateInfSnapshot(m.GossipMessage, msg.GetConnectionInfo().ID)
return
}
if m.IsDataMsg() || m.IsStateInfoMsg() {
added := false
if m.IsDataMsg() {
if m.GetDataMsg().Payload == nil {
gc.logger.Warning("Payload is empty, got it from", msg.GetConnectionInfo().ID)
return
}
// Would this block go into the message store if it was verified?
if !gc.blockMsgStore.CheckValid(msg.GetGossipMessage()) {
return
}
if !gc.verifyBlock(m.GossipMessage, msg.GetConnectionInfo().ID) {
gc.logger.Warning("Failed verifying block", m.GetDataMsg().Payload.SeqNum)
return
}
added = gc.blockMsgStore.Add(msg.GetGossipMessage())
} else { // StateInfoMsg verification should be handled in a layer above
// since we don't have access to the id mapper here
added = gc.stateInfoMsgStore.Add(msg.GetGossipMessage())
}
if added {
// Forward the message
gc.Forward(msg)
// DeMultiplex to local subscribers
gc.DeMultiplex(m)
if m.IsDataMsg() {
gc.blocksPuller.Add(msg.GetGossipMessage())
}
}
return
}
if m.IsPullMsg() && m.GetPullMsgType() == proto.PullMsgType_BLOCK_MSG {
if gc.hasLeftChannel() {
gc.logger.Info("Received Pull message from", msg.GetConnectionInfo().Endpoint, "but left the channel", string(gc.chainID))
return
}
// If we don't have a StateInfo message from the peer,
// no way of validating its eligibility in the channel.
if gc.stateInfoMsgStore.MsgByID(msg.GetConnectionInfo().ID) == nil {
gc.logger.Debug("Don't have StateInfo message of peer", msg.GetConnectionInfo())
return
}
if !gc.eligibleForChannelAndSameOrg(discovery.NetworkMember{PKIid: msg.GetConnectionInfo().ID}) {
gc.logger.Warning(msg.GetConnectionInfo(), "isn't eligible for pulling blocks of", string(gc.chainID))
return
}
if m.IsDataUpdate() {
// Iterate over the envelopes, and filter out blocks
// that we already have in the blockMsgStore, or blocks that
// are too far in the past.
filteredEnvelopes := []*proto.Envelope{}
for _, item := range m.GetDataUpdate().Data {
gMsg, err := item.ToGossipMessage()
if err != nil {
gc.logger.Warningf("Data update contains an invalid message: %+v", errors.WithStack(err))
return
}
if !bytes.Equal(gMsg.Channel, []byte(gc.chainID)) {
gc.logger.Warning("DataUpdate message contains item with channel", gMsg.Channel, "but should be", gc.chainID)
return
}
// Would this block go into the message store if it was verified?
if !gc.blockMsgStore.CheckValid(msg.GetGossipMessage()) {
return
}
if !gc.verifyBlock(gMsg.GossipMessage, msg.GetConnectionInfo().ID) {
return
}
added := gc.blockMsgStore.Add(gMsg)
if !added {
// If this block doesn't need to be added, it means it either already
// exists in memory or that it is too far in the past
continue
}
filteredEnvelopes = append(filteredEnvelopes, item)
}
// Replace the update message with just the blocks that should be processed
m.GetDataUpdate().Data = filteredEnvelopes
}
gc.blocksPuller.HandleMessage(msg)
}
if m.IsLeadershipMsg() {
// Handling leadership message
added := gc.leaderMsgStore.Add(m)
if added {
gc.DeMultiplex(m)
}
}
}
func (gc *gossipChannel) handleStateInfSnapshot(m *proto.GossipMessage, sender common.PKIidType) {
chanName := string(gc.chainID)
for _, envelope := range m.GetStateSnapshot().Elements {
stateInf, err := envelope.ToGossipMessage()
if err != nil {
gc.logger.Warningf("Channel %s : StateInfo snapshot contains an invalid message: %+v", chanName, errors.WithStack(err))
return
}
if !stateInf.IsStateInfoMsg() {
gc.logger.Warning("Channel", chanName, ": Element of StateInfoSnapshot isn't a StateInfoMessage:",
stateInf, "message sent from", sender)
return
}
si := stateInf.GetStateInfo()
orgID := gc.GetOrgOfPeer(si.PkiId)
if orgID == nil {
gc.logger.Debug("Channel", chanName, ": Couldn't find org identity of peer",
string(si.PkiId), "message sent from", string(sender))
return
}
if !gc.IsOrgInChannel(orgID) {
gc.logger.Warning("Channel", chanName, ": Peer", stateInf.GetStateInfo().PkiId,
"is not in an eligible org, can't process a stateInfo from it, sent from", sender)
return
}
expectedMAC := GenerateMAC(si.PkiId, gc.chainID)
if !bytes.Equal(si.Channel_MAC, expectedMAC) {
gc.logger.Warning("Channel", chanName, ": StateInfo message", stateInf,
", has an invalid MAC. Expected", expectedMAC, ", got", si.Channel_MAC, ", sent from", sender)
return
}
err = gc.ValidateStateInfoMessage(stateInf)
if err != nil {
gc.logger.Warningf("Channel %s: Failed validating state info message: %v sent from %v : %+v", chanName, stateInf, sender, errors.WithStack(err))
return
}
if gc.Lookup(si.PkiId) == nil {
// Skip StateInfo messages that belong to peers
// that have been expired
continue
}
gc.stateInfoMsgStore.Add(stateInf)
}
}
func (gc *gossipChannel) verifyBlock(msg *proto.GossipMessage, sender common.PKIidType) bool {
if !msg.IsDataMsg() {
gc.logger.Warning("Received from ", sender, "a DataUpdate message that contains a non-block GossipMessage:", msg)
return false
}
payload := msg.GetDataMsg().Payload
if payload == nil {
gc.logger.Warning("Received empty payload from", sender)
return false
}
seqNum := payload.SeqNum
rawBlock := payload.Data
err := gc.mcs.VerifyBlock(msg.Channel, seqNum, rawBlock)
if err != nil {
gc.logger.Warningf("Received fabricated block from %v in DataUpdate: %+v", sender, errors.WithStack(err))
return false
}
return true
}
func (gc *gossipChannel) createStateInfoSnapshot(requestersOrg api.OrgIdentityType) *proto.GossipMessage {
sameOrg := bytes.Equal(gc.selfOrg, requestersOrg)
rawElements := gc.stateInfoMsgStore.Get()
elements := []*proto.Envelope{}
for _, rawEl := range rawElements {
msg := rawEl.(*proto.SignedGossipMessage)
orgOfCurrentMsg := gc.GetOrgOfPeer(msg.GetStateInfo().PkiId)
// If we're in the same org as the requester, or the message belongs to a foreign org
// don't do any filtering
if sameOrg || !bytes.Equal(orgOfCurrentMsg, gc.selfOrg) {
elements = append(elements, msg.Envelope)
continue
}
// Else, the requester is in a different org, so disclose only StateInfo messages that their
// corresponding AliveMessages have external endpoints
if netMember := gc.Lookup(msg.GetStateInfo().PkiId); netMember == nil || netMember.Endpoint == "" {
continue
}
elements = append(elements, msg.Envelope)
}
return &proto.GossipMessage{
Channel: gc.chainID,
Tag: proto.GossipMessage_CHAN_OR_ORG,
Nonce: 0,
Content: &proto.GossipMessage_StateSnapshot{
StateSnapshot: &proto.StateInfoSnapshot{
Elements: elements,
},
},
}
}
func (gc *gossipChannel) verifyMsg(msg proto.ReceivedMessage) bool {
if msg == nil {
gc.logger.Warning("Messsage is nil")
return false
}
m := msg.GetGossipMessage()
if m == nil {
gc.logger.Warning("Message content is empty")
return false
}
if msg.GetConnectionInfo().ID == nil {
gc.logger.Warning("Message has nil PKI-ID")
return false
}
if m.IsStateInfoMsg() {
si := m.GetStateInfo()
expectedMAC := GenerateMAC(si.PkiId, gc.chainID)
if !bytes.Equal(expectedMAC, si.Channel_MAC) {
gc.logger.Warning("Message contains wrong channel MAC(", si.Channel_MAC, "), expected", expectedMAC)
return false
}
return true
}
if m.IsStateInfoPullRequestMsg() {
sipr := m.GetStateInfoPullReq()
expectedMAC := GenerateMAC(msg.GetConnectionInfo().ID, gc.chainID)
if !bytes.Equal(expectedMAC, sipr.Channel_MAC) {
gc.logger.Warning("Message contains wrong channel MAC(", sipr.Channel_MAC, "), expected", expectedMAC)
return false
}
return true
}
if !bytes.Equal(m.Channel, []byte(gc.chainID)) {
gc.logger.Warning("Message contains wrong channel(", m.Channel, "), expected", gc.chainID)
return false
}
return true
}
func (gc *gossipChannel) createStateInfoRequest() (*proto.SignedGossipMessage, error) {
return (&proto.GossipMessage{
Tag: proto.GossipMessage_CHAN_OR_ORG,
Nonce: 0,
Content: &proto.GossipMessage_StateInfoPullReq{
StateInfoPullReq: &proto.StateInfoPullRequest{
Channel_MAC: GenerateMAC(gc.pkiID, gc.chainID),
},
},
}).NoopSign()
}
// UpdateStateInfo updates this channel's StateInfo message
// that is periodically published
func (gc *gossipChannel) UpdateStateInfo(msg *proto.SignedGossipMessage) {
if !msg.IsStateInfoMsg() {
return
}
gc.Lock()
defer gc.Unlock()
gc.stateInfoMsgStore.Add(msg)
gc.ledgerHeight = msg.GetStateInfo().Properties.LedgerHeight
gc.stateInfoMsg = msg
atomic.StoreInt32(&gc.shouldGossipStateInfo, int32(1))
}
func newStateInfoCache(sweepInterval time.Duration, hasExpired func(interface{}) bool, verifyFunc membershipPredicate) *stateInfoCache {
membershipStore := util.NewMembershipStore()
pol := proto.NewGossipMessageComparator(0)
s := &stateInfoCache{
verify: verifyFunc,
MembershipStore: membershipStore,
stopChan: make(chan struct{}),
}
invalidationTrigger := func(m interface{}) {
pkiID := m.(*proto.SignedGossipMessage).GetStateInfo().PkiId
membershipStore.Remove(pkiID)
}
s.MessageStore = msgstore.NewMessageStore(pol, invalidationTrigger)
go func() {
for {
select {
case <-s.stopChan:
return
case <-time.After(sweepInterval):
s.Purge(hasExpired)
}
}
}()
return s
}
// membershipPredicate receives a StateInfoMessage and optionally a slice of organization identifiers
// and returns whether the peer that signed the given StateInfoMessage is eligible
// to the channel or not
type membershipPredicate func(msg *proto.SignedGossipMessage, orgs ...api.OrgIdentityType) bool
// stateInfoCache is actually a messageStore
// that also indexes messages that are added
// so that they could be extracted later
type stateInfoCache struct {
verify membershipPredicate
*util.MembershipStore
msgstore.MessageStore
stopChan chan struct{}
}
func (cache *stateInfoCache) validate(orgs []api.OrgIdentityType) {
for _, m := range cache.Get() {
msg := m.(*proto.SignedGossipMessage)
if !cache.verify(msg, orgs...) {
cache.delete(msg)
}
}
}
// Add attempts to add the given message to the stateInfoCache,
// and if the message was added, also indexes it.
// Message must be a StateInfo message.
func (cache *stateInfoCache) Add(msg *proto.SignedGossipMessage) bool {
if !cache.MessageStore.CheckValid(msg) {
return false
}
if !cache.verify(msg) {
return false
}
added := cache.MessageStore.Add(msg)
if added {
pkiID := msg.GetStateInfo().PkiId
cache.MembershipStore.Put(pkiID, msg)
}
return added
}
func (cache *stateInfoCache) delete(msg *proto.SignedGossipMessage) {
cache.Purge(func(o interface{}) bool {
pkiID := o.(*proto.SignedGossipMessage).GetStateInfo().PkiId
return bytes.Equal(pkiID, msg.GetStateInfo().PkiId)
})
cache.Remove(msg.GetStateInfo().PkiId)
}
func (cache *stateInfoCache) Stop() {
cache.stopChan <- struct{}{}
}
// GenerateMAC returns a byte slice that is derived from the peer's PKI-ID
// and a channel name
func GenerateMAC(pkiID common.PKIidType, channelID common.ChainID) []byte {
// Hash is computed on (PKI-ID || channel ID)
preImage := append([]byte(pkiID), []byte(channelID)...)
return common_utils.ComputeSHA256(preImage)
}