[FAB-3520] Eventer doesn't trigger subsequent updates

The eventer applies the config on an object that is returned from
an invocation of config.Organizations(), which returns the same
reference of map in each config update.

The config.Organizations() is a map from org name to config.ApplicationOrg
which has the anchor peers.

Due to the fact that the references are the same,
the ce.lastConfig.orgMap is the same as the new orgMap of a new config update,
and this makes the logic think that there has not been any update of
anchor peers at every real update (of anchor peers).

I fixed the bug by cloning the map, and also fixed the test
in eventer_test.go(line 98) to fail when the code of the eventer.go
is before the fix.

Change-Id: Iede772975216a88d00badfc9d7092f92580737a8
Signed-off-by: Yacov Manevich <yacovm@il.ibm.com>

Author: yacovm

gossip/service/eventer.go

@@ -68,8 +68,8 @@ func newConfigEventer(receiver configEventReceiver) *configEventer {
 // Note, that a changing sequence number is ignored as changing configuration
 func (ce *configEventer) ProcessConfigUpdate(config Config) {
 	logger.Debugf("Processing new config for channel %s", config.ChainID())
-
-	if ce.lastConfig != nil && reflect.DeepEqual(ce.lastConfig.orgMap, config.Organizations()) {
+	orgMap := cloneOrgConfig(config.Organizations())
+	if ce.lastConfig != nil && reflect.DeepEqual(ce.lastConfig.orgMap, orgMap) {
 		logger.Debugf("Ignoring new config for channel %s because it contained no anchor peer updates", config.ChainID())
 		return
 	}
@@ -80,11 +80,41 @@ func (ce *configEventer) ProcessConfigUpdate(config Config) {
 	}
 
 	newConfig := &configStore{
-		orgMap:      config.Organizations(),
+		orgMap:      orgMap,
 		anchorPeers: newAnchorPeers,
 	}
 	ce.lastConfig = newConfig
 
 	logger.Debugf("Calling out because config was updated for channel %s", config.ChainID())
 	ce.receiver.configUpdated(config)
 }
+
+func cloneOrgConfig(src map[string]config.ApplicationOrg) map[string]config.ApplicationOrg {
+	clone := make(map[string]config.ApplicationOrg)
+	for k, v := range src {
+		clone[k] = &appGrp{
+			name:        v.Name(),
+			mspID:       v.MSPID(),
+			anchorPeers: v.AnchorPeers(),
+		}
+	}
+	return clone
+}
+
+type appGrp struct {
+	name        string
+	mspID       string
+	anchorPeers []*peer.AnchorPeer
+}
+
+func (ag *appGrp) Name() string {
+	return ag.name
+}
+
+func (ag *appGrp) MSPID() string {
+	return ag.mspID
+}
+
+func (ag *appGrp) AnchorPeers() []*peer.AnchorPeer {
+	return ag.anchorPeers
+}

gossip/service/eventer_test.go

@@ -27,24 +27,10 @@ import (
 
 const testChainID = "foo"
 
-type applicationOrgs []*peer.AnchorPeer
-
 func init() {
 	util.SetupTestLogging()
 }
 
-func (ao applicationOrgs) AnchorPeers() []*peer.AnchorPeer {
-	return ao
-}
-
-func (ao applicationOrgs) MSPID() string {
-	return "ORG1"
-}
-
-func (ao applicationOrgs) Name() string {
-	panic("Unimplimented")
-}
-
 type mockReceiver struct {
 	orgs     map[string]config.ApplicationOrg
 	sequence uint64
@@ -76,11 +62,9 @@ func TestInitialUpdate(t *testing.T) {
 	mc := &mockConfig{
 		sequence: 7,
 		orgs: map[string]config.ApplicationOrg{
-			testOrgID: applicationOrgs([]*peer.AnchorPeer{
-				&peer.AnchorPeer{
-					Port: 9,
-				},
-			}),
+			testOrgID: &appGrp{
+				anchorPeers: []*peer.AnchorPeer{{Port: 9}},
+			},
 		},
 	}
 
@@ -95,15 +79,14 @@ func TestInitialUpdate(t *testing.T) {
 }
 
 func TestSecondUpdate(t *testing.T) {
+	appGrps := map[string]config.ApplicationOrg{
+		testOrgID: &appGrp{
+			anchorPeers: []*peer.AnchorPeer{{Port: 9}},
+		},
+	}
 	mc := &mockConfig{
 		sequence: 7,
-		orgs: map[string]config.ApplicationOrg{
-			testOrgID: applicationOrgs([]*peer.AnchorPeer{
-				&peer.AnchorPeer{
-					Port: 9,
-				},
-			}),
-		},
+		orgs:     appGrps,
 	}
 
 	mr := &mockReceiver{}
@@ -112,30 +95,24 @@ func TestSecondUpdate(t *testing.T) {
 	ce.ProcessConfigUpdate(mc)
 
 	mc.sequence = 8
-	mc.orgs = map[string]config.ApplicationOrg{
-		testOrgID: applicationOrgs([]*peer.AnchorPeer{
-			&peer.AnchorPeer{
-				Port: 10,
-			},
-		}),
+	appGrps[testOrgID] = &appGrp{
+		anchorPeers: []*peer.AnchorPeer{{Port: 10}},
 	}
 
 	ce.ProcessConfigUpdate(mc)
 
 	if !reflect.DeepEqual(mc, (*mockConfig)(mr)) {
-		t.Fatalf("Should have updated config on initial update but did not")
+		t.Fatal("Should have updated config on initial update but did not")
 	}
 }
 
 func TestSecondSameUpdate(t *testing.T) {
 	mc := &mockConfig{
 		sequence: 7,
 		orgs: map[string]config.ApplicationOrg{
-			testOrgID: applicationOrgs([]*peer.AnchorPeer{
-				&peer.AnchorPeer{
-					Port: 9,
-				},
-			}),
+			testOrgID: &appGrp{
+				anchorPeers: []*peer.AnchorPeer{{Port: 9}},
+			},
 		},
 	}
 
@@ -148,23 +125,21 @@ func TestSecondSameUpdate(t *testing.T) {
 	ce.ProcessConfigUpdate(mc)
 
 	if mr.sequence != 0 {
-		t.Errorf("Should not have updated sequence when reprocessing same config")
+		t.Error("Should not have updated sequence when reprocessing same config")
 	}
 
 	if mr.orgs != nil {
-		t.Errorf("Should not have updated anchor peers when reprocessing same config")
+		t.Error("Should not have updated anchor peers when reprocessing same config")
 	}
 }
 
 func TestUpdatedSeqOnly(t *testing.T) {
 	mc := &mockConfig{
 		sequence: 7,
 		orgs: map[string]config.ApplicationOrg{
-			testOrgID: applicationOrgs([]*peer.AnchorPeer{
-				&peer.AnchorPeer{
-					Port: 9,
-				},
-			}),
+			testOrgID: &appGrp{
+				anchorPeers: []*peer.AnchorPeer{{Port: 9}},
+			},
 		},
 	}
 

gossip/service/gossip_service_test.go

@@ -740,7 +740,10 @@ func TestChannelConfig(t *testing.T) {
 	mc := &mockConfig{
 		sequence: 1,
 		orgs: map[string]config.ApplicationOrg{
-			testOrgID: applicationOrgs([]*peer.AnchorPeer{}),
+			string(orgInChannelA): &appGrp{
+				mspID:       string(orgInChannelA),
+				anchorPeers: []*peer.AnchorPeer{},
+			},
 		},
 	}
 	gService.JoinChan(jcm, gossipCommon.ChainID("A"))