[FAB-18237] always update stateInfo message upon chaincode update

With the change of FAB-18208, gossip saves CPU cycles by only updating
metadata information if peer membership is not empty.

However, this makes discovery incapable of operating in case
anchor/bootstrap peers are not defined, or, in case
the peer is the only peer in the network.

This change makes gossip always update its information, including
signing the stateInfo message, whenever it receives a chaincode update.

Change-Id: Iaf04441944a3fe5d889233d35bdcb1173c31e2bc
Signed-off-by: yacovm <yacovm@il.ibm.com>

gossip/gossip/channel/channel.go

@@ -414,14 +414,18 @@ func (gc *gossipChannel) publishStateInfo() {
 		return
 	}
 
+	gc.publishSignedStateInfoMessage()
+	atomic.StoreInt32(&gc.shouldGossipStateInfo, int32(0))
+}
+
+func (gc *gossipChannel) publishSignedStateInfoMessage() {
 	stateInfoMsg, err := gc.setupSignedStateInfoMessage()
 	if err != nil {
 		gc.logger.Errorf("Failed creating signed state info message: %v", err)
 		return
 	}
 	gc.stateInfoMsgStore.Add(stateInfoMsg)
 	gc.Gossip(stateInfoMsg)
-	atomic.StoreInt32(&gc.shouldGossipStateInfo, int32(0))
 }
 
 func (gc *gossipChannel) setupSignedStateInfoMessage() (*protoext.SignedGossipMessage, error) {
@@ -928,6 +932,14 @@ func (gc *gossipChannel) UpdateLedgerHeight(height uint64) {
 // UpdateChaincodes updates the chaincodes the peer publishes
 // to other peers in the channel
 func (gc *gossipChannel) UpdateChaincodes(chaincodes []*proto.Chaincode) {
+	// Always publish the signed state info message regardless.
+	// We do this because we have to update our data structures
+	// with the new chaincodes installed/instantiated, to be able to
+	// respond to discovery requests, no matter if we see other peers
+	// in the membership, or do not see them.
+
+	defer gc.publishSignedStateInfoMessage()
+
 	gc.Lock()
 	defer gc.Unlock()
 

gossip/gossip/channel/channel_test.go

@@ -1132,6 +1132,14 @@ func TestNoGossipOrSigningWhenEmptyMembership(t *testing.T) {
 	time.Sleep(conf.PublishStateInfoInterval * 3)
 	// We haven't signed anything
 	assert.Equal(t, uint32(2), atomic.LoadUint32(&adapter.signCallCount))
+
+	assert.Empty(t, gc.Self().GetStateInfo().Properties.Chaincodes)
+	gossipedWG.Add(1)
+	// Now, update chaincodes and check our chaincode information was indeed updated
+	gc.UpdateChaincodes([]*proto.Chaincode{{Name: "mycc"}})
+	// We should have signed regardless!
+	assert.Equal(t, uint32(3), atomic.LoadUint32(&adapter.signCallCount))
+	assert.Equal(t, "mycc", gc.Self().GetStateInfo().Properties.Chaincodes[0].Name)
 }
 
 func TestChannelPulledBadBlocks(t *testing.T) {

integration/discovery/discovery_test.go

@@ -84,7 +84,6 @@ var _ = Describe("DiscoveryService", func() {
 
 		orderer = network.Orderer("orderer")
 		network.CreateAndJoinChannel(orderer, "testchannel")
-		network.UpdateChannelAnchors(orderer, "testchannel")
 
 		org1Peer0 = network.Peer("Org1", "peer0")
 		org2Peer0 = network.Peer("Org2", "peer0")
@@ -102,10 +101,46 @@ var _ = Describe("DiscoveryService", func() {
 		os.RemoveAll(testDir)
 	})
 
+	It("discovers network configuration even without anchor peers present", func() {
+		chaincodeWhenNoAnchorPeers := nwo.Chaincode{
+			Name:    "noanchorpeersjustyet",
+			Version: "1.0",
+			Path:    "github.com/hyperledger/fabric/integration/chaincode/simple/cmd",
+			Ctor:    `{"Args":["init","a","100","b","200"]}`,
+			Policy:  `OR ('Org1MSP.member')`,
+		}
+		By("Deploying chaincode before anchor peers are defined in the channel")
+		nwo.DeployChaincodeLegacy(network, "testchannel", orderer, chaincodeWhenNoAnchorPeers, org1Peer0)
+
+		endorsersForChaincodeBeforeAnchorPeersExist := commands.Endorsers{
+			UserCert:  network.PeerUserCert(org1Peer0, "User1"),
+			UserKey:   network.PeerUserKey(org1Peer0, "User1"),
+			MSPID:     network.Organization(org1Peer0.Organization).MSPID,
+			Server:    network.PeerAddress(org1Peer0, nwo.ListenPort),
+			Channel:   "testchannel",
+			Chaincode: chaincodeWhenNoAnchorPeers.Name,
+		}
+		discoveryQuery := discoverEndorsers(network, endorsersForChaincodeBeforeAnchorPeersExist)
+		Eventually(discoveryQuery, network.EventuallyTimeout).Should(BeEquivalentTo(
+			[]ChaincodeEndorsers{
+				{
+					Chaincode: chaincodeWhenNoAnchorPeers.Name,
+					EndorsersByGroups: map[string][]nwo.DiscoveredPeer{
+						"G0": {network.DiscoveredPeer(org1Peer0)},
+					},
+					Layouts: []*discovery.Layout{
+						{
+							QuantitiesByGroup: map[string]uint32{"G0": 1},
+						},
+					},
+				},
+			},
+		))
+	})
+
 	It("discovers network configuration, endorsers, and peer membership", func() {
-		//
-		// discovering network configuration information
-		//
+		By("Updating anchor peers")
+		network.UpdateChannelAnchors(orderer, "testchannel")
 
 		By("retrieving the configuration")
 		config := commands.Config{