state: Add two more tests for connect events with terminating gateways

And expand one test case to cover more.

Co-Authored-By: Kyle Havlovitz <kylehav@gmail.com>

agent/consul/state/catalog.go

@@ -900,18 +900,19 @@ func maxIndexAndWatchChsForServiceNodes(tx ReadTxn,
 // compatible destination for the given service name. This will include
 // both proxies and native integrations.
 func (s *Store) ConnectServiceNodes(ws memdb.WatchSet, serviceName string, entMeta *structs.EnterpriseMeta) (uint64, structs.ServiceNodes, error) {
-	return s.serviceNodes(ws, serviceName, true, entMeta)
+	tx := s.db.ReadTxn()
+	defer tx.Abort()
+	return serviceNodesTxn(tx, ws, serviceName, true, entMeta)
 }
 
 // ServiceNodes returns the nodes associated with a given service name.
 func (s *Store) ServiceNodes(ws memdb.WatchSet, serviceName string, entMeta *structs.EnterpriseMeta) (uint64, structs.ServiceNodes, error) {
-	return s.serviceNodes(ws, serviceName, false, entMeta)
+	tx := s.db.ReadTxn()
+	defer tx.Abort()
+	return serviceNodesTxn(tx, ws, serviceName, false, entMeta)
 }
 
-func (s *Store) serviceNodes(ws memdb.WatchSet, serviceName string, connect bool, entMeta *structs.EnterpriseMeta) (uint64, structs.ServiceNodes, error) {
-	tx := s.db.Txn(false)
-	defer tx.Abort()
-
+func serviceNodesTxn(tx ReadTxn, ws memdb.WatchSet, serviceName string, connect bool, entMeta *structs.EnterpriseMeta) (uint64, structs.ServiceNodes, error) {
 	// Function for lookup
 	index := "service"
 	if connect {

agent/consul/state/catalog_events.go

@@ -210,38 +210,29 @@ func ServiceHealthEventsFromChanges(tx ReadTxn, changes Changes) ([]stream.Event
 			}
 
 			gsChange := serviceChange{changeType: changeTypeFromChange(change), change: change}
+
 			if termGatewayChanges == nil {
 				termGatewayChanges = make(map[structs.ServiceName]map[structs.ServiceName]serviceChange)
 			}
 
-			gatewayChanges, ok := termGatewayChanges[gs.Gateway]
+			_, ok := termGatewayChanges[gs.Gateway]
 			if !ok {
 				termGatewayChanges[gs.Gateway] = map[structs.ServiceName]serviceChange{}
 			}
 
-			prevChange, ok := gatewayChanges[gs.Service]
-			if !ok {
+			switch gsChange.changeType {
+			case changeUpdate:
+				after := gsChange.change.After.(*structs.GatewayService)
+				if gsChange.change.Before.(*structs.GatewayService).IsSame(after) {
+					continue
+				}
 				termGatewayChanges[gs.Gateway][gs.Service] = gsChange
-				continue
-			}
-
-			if changeTypeFromChange(change) == changeDelete {
+			case changeDelete, changeCreate:
 				termGatewayChanges[gs.Gateway][gs.Service] = gsChange
-				continue
-			}
-
-			prevGs := changeObject(prevChange.change).(*structs.GatewayService)
-			if !gs.IsSame(prevGs) {
-				gsChange.changeType = changeUpdate
-				termGatewayChanges[gs.Gateway][gs.Service] = gsChange
-			} else {
-				delete(termGatewayChanges[gs.Gateway], gs.Service)
 			}
 		}
 	}
 
-	//fmt.Printf("term gateway map: %v", termGatewayChanges)
-
 	// Now act on those marked nodes/services
 	for node, changeType := range nodeChanges {
 		if changeType == changeDelete {
@@ -304,7 +295,7 @@ func ServiceHealthEventsFromChanges(tx ReadTxn, changes Changes) ([]stream.Event
 		for serviceName, gsChange := range serviceChanges {
 			gs := changeObject(gsChange.change).(*structs.GatewayService)
 
-			_, nodes, err := serviceGatewayNodes(tx, nil, serviceName.Name, gs.GatewayKind, &gatewayName.EnterpriseMeta)
+			_, nodes, err := serviceNodesTxn(tx, nil, gs.Gateway.Name, false, &gatewayName.EnterpriseMeta)
 			if err != nil {
 				return nil, err
 			}

agent/consul/state/catalog_events_test.go

@@ -1037,8 +1037,15 @@ func TestServiceHealthEventsFromChanges(t *testing.T) {
 				return ensureConfigEntryTxn(tx, tx.Index, configEntry, structs.DefaultEnterpriseMeta())
 			},
 			Mutate: func(s *Store, tx *txn) error {
-				return s.ensureRegistrationTxn(tx, tx.Index, false,
-					testServiceRegistration(t, "tgate1", regTerminatingGateway), false)
+				if err := s.ensureRegistrationTxn(
+					tx, tx.Index, false,
+					testServiceRegistration(t, "tgate1", regTerminatingGateway), false,
+				); err != nil {
+					return err
+				}
+				return s.ensureRegistrationTxn(
+					tx, tx.Index, false,
+					testServiceRegistration(t, "tgate1", regTerminatingGateway, regNode2), false)
 			},
 			WantEvents: []stream.Event{
 				testServiceHealthEvent(t,
@@ -1052,6 +1059,20 @@ func TestServiceHealthEventsFromChanges(t *testing.T) {
 					"tgate1",
 					evConnectTopic,
 					evServiceTermingGateway("srv2")),
+				testServiceHealthEvent(t,
+					"tgate1",
+					evServiceTermingGateway("tgate1"),
+					evNode2),
+				testServiceHealthEvent(t,
+					"tgate1",
+					evConnectTopic,
+					evServiceTermingGateway("srv1"),
+					evNode2),
+				testServiceHealthEvent(t,
+					"tgate1",
+					evConnectTopic,
+					evServiceTermingGateway("srv2"),
+					evNode2),
 			},
 		},
 		{
@@ -1091,9 +1112,100 @@ func TestServiceHealthEventsFromChanges(t *testing.T) {
 					evServiceIndex(setupIndex)),
 			},
 		},
-		// terminating gateway with 2 instances
-		// changing config entry to add a linked service
-		// changing config entry to remove a linked service
+		{
+			Name: "change the terminating gateway config entry to add a linked service",
+			Setup: func(s *Store, tx *txn) error {
+				configEntry := &structs.TerminatingGatewayConfigEntry{
+					Kind: structs.TerminatingGateway,
+					Name: "tgate1",
+					Services: []structs.LinkedService{
+						{
+							Name:           "srv1",
+							EnterpriseMeta: *structs.DefaultEnterpriseMeta(),
+						},
+					},
+					EnterpriseMeta: *structs.DefaultEnterpriseMeta(),
+				}
+				err := ensureConfigEntryTxn(tx, tx.Index, configEntry, structs.DefaultEnterpriseMeta())
+				if err != nil {
+					return err
+				}
+				return s.ensureRegistrationTxn(tx, tx.Index, false,
+					testServiceRegistration(t, "tgate1", regTerminatingGateway), false)
+			},
+			Mutate: func(s *Store, tx *txn) error {
+				configEntry := &structs.TerminatingGatewayConfigEntry{
+					Kind: structs.TerminatingGateway,
+					Name: "tgate1",
+					Services: []structs.LinkedService{
+						{
+							Name:           "srv1",
+							EnterpriseMeta: *structs.DefaultEnterpriseMeta(),
+						},
+						{
+							Name:           "srv2",
+							EnterpriseMeta: *structs.DefaultEnterpriseMeta(),
+						},
+					},
+					EnterpriseMeta: *structs.DefaultEnterpriseMeta(),
+				}
+				return ensureConfigEntryTxn(tx, tx.Index, configEntry, structs.DefaultEnterpriseMeta())
+			},
+			WantEvents: []stream.Event{
+				testServiceHealthEvent(t,
+					"tgate1",
+					evConnectTopic,
+					evServiceTermingGateway("srv2"),
+					evServiceIndex(setupIndex)),
+			},
+		},
+		{
+			Name: "change the terminating gateway config entry to remove a linked service",
+			Setup: func(s *Store, tx *txn) error {
+				configEntry := &structs.TerminatingGatewayConfigEntry{
+					Kind: structs.TerminatingGateway,
+					Name: "tgate1",
+					Services: []structs.LinkedService{
+						{
+							Name:           "srv1",
+							EnterpriseMeta: *structs.DefaultEnterpriseMeta(),
+						},
+						{
+							Name:           "srv2",
+							EnterpriseMeta: *structs.DefaultEnterpriseMeta(),
+						},
+					},
+					EnterpriseMeta: *structs.DefaultEnterpriseMeta(),
+				}
+				err := ensureConfigEntryTxn(tx, tx.Index, configEntry, structs.DefaultEnterpriseMeta())
+				if err != nil {
+					return err
+				}
+				return s.ensureRegistrationTxn(tx, tx.Index, false,
+					testServiceRegistration(t, "tgate1", regTerminatingGateway), false)
+			},
+			Mutate: func(s *Store, tx *txn) error {
+				configEntry := &structs.TerminatingGatewayConfigEntry{
+					Kind: structs.TerminatingGateway,
+					Name: "tgate1",
+					Services: []structs.LinkedService{
+						{
+							Name:           "srv2",
+							EnterpriseMeta: *structs.DefaultEnterpriseMeta(),
+						},
+					},
+					EnterpriseMeta: *structs.DefaultEnterpriseMeta(),
+				}
+				return ensureConfigEntryTxn(tx, tx.Index, configEntry, structs.DefaultEnterpriseMeta())
+			},
+			WantEvents: []stream.Event{
+				testServiceHealthDeregistrationEvent(t,
+					"tgate1",
+					evConnectTopic,
+					evServiceTermingGateway("srv1")),
+			},
+		},
+		// change the terminating gateway config entry to update a linked service (new SNI/CAFile/etc)
 		// deleting a config entry
 		// deregistering a service behind a terminating gateway (should send no term gateway events)
 	}
@@ -1127,15 +1239,13 @@ func TestServiceHealthEventsFromChanges(t *testing.T) {
 			}
 			require.NoError(t, err)
 
-			assertDeepEqual(t, tc.WantEvents, got, cmpPartialOrderEvents)
+			assertDeepEqual(t, tc.WantEvents, got, cmpPartialOrderEvents, cmpopts.EquateEmpty())
 		})
 	}
 }
 
 func regTerminatingGateway(req *structs.RegisterRequest) error {
-	req.Service.Service = "tgate1"
 	req.Service.Kind = structs.ServiceKindTerminatingGateway
-	req.Service.ID = "tgate1"
 	req.Service.Port = 22000
 	return nil
 }