Add filter by service type feature

main.go

@@ -75,6 +75,7 @@ func main() {
 		PublishInternal:          cfg.PublishInternal,
 		PublishHostIP:            cfg.PublishHostIP,
 		ConnectorServer:          cfg.ConnectorSourceServer,
+		ServiceTypeFilter:        cfg.ServiceTypeFilter,
 	}
 
 	// Lookup all the selected sources by names and pass them the desired configuration.

pkg/apis/externaldns/types.go

@@ -91,6 +91,7 @@ type Config struct {
 	ExoscaleEndpoint         string
 	ExoscaleAPIKey           string
 	ExoscaleAPISecret        string
+	ServiceTypeFilter        []string
 }
 
 var defaultConfig = &Config{
@@ -144,6 +145,7 @@ var defaultConfig = &Config{
 	ExoscaleEndpoint:         "https://api.exoscale.ch/dns",
 	ExoscaleAPIKey:           "",
 	ExoscaleAPISecret:        "",
+	ServiceTypeFilter:        []string{},
 }
 
 // NewConfig returns new Config object
@@ -197,6 +199,7 @@ func (cfg *Config) ParseFlags(args []string) error {
 	app.Flag("publish-internal-services", "Allow external-dns to publish DNS records for ClusterIP services (optional)").BoolVar(&cfg.PublishInternal)
 	app.Flag("publish-host-ip", "Allow external-dns to publish host-ip for headless services (optional)").BoolVar(&cfg.PublishHostIP)
 	app.Flag("connector-source-server", "The server to connect for connector source, valid only when using connector source").Default(defaultConfig.ConnectorSourceServer).StringVar(&cfg.ConnectorSourceServer)
+	app.Flag("service-type-filter", "The service types to take care about (default: all, expected: ClusterIP, NodePort, LoadBalancer or ExternalName)").StringsVar(&cfg.ServiceTypeFilter)
 
 	// Flags related to providers
 	app.Flag("provider", "The DNS provider where the DNS records will be created (required, options: aws, aws-sd, google, azure, cloudflare, digitalocean, dnsimple, infoblox, dyn, designate, coredns, skydns, inmemory, pdns, oci, exoscale, linode)").Required().PlaceHolder("provider").EnumVar(&cfg.Provider, "aws", "aws-sd", "google", "azure", "cloudflare", "digitalocean", "dnsimple", "infoblox", "dyn", "designate", "coredns", "skydns", "inmemory", "pdns", "oci", "exoscale", "linode")

source/service.go

@@ -52,10 +52,11 @@ type serviceSource struct {
 	combineFQDNAnnotation bool
 	publishInternal       bool
 	publishHostIP         bool
+	serviceTypeFilter     map[string]struct{}
 }
 
 // NewServiceSource creates a new serviceSource with the given config.
-func NewServiceSource(kubeClient kubernetes.Interface, namespace, annotationFilter string, fqdnTemplate string, combineFqdnAnnotation bool, compatibility string, publishInternal bool, publishHostIP bool) (Source, error) {
+func NewServiceSource(kubeClient kubernetes.Interface, namespace, annotationFilter string, fqdnTemplate string, combineFqdnAnnotation bool, compatibility string, publishInternal bool, publishHostIP bool, serviceTypeFilter []string) (Source, error) {
 	var (
 		tmpl *template.Template
 		err  error
@@ -69,6 +70,13 @@ func NewServiceSource(kubeClient kubernetes.Interface, namespace, annotationFilt
 		}
 	}
 
+	// Transform the slice into a map so it will
+	// be way much easier and fast to filter later
+	serviceTypes := make(map[string]struct{})
+	for _, serviceType := range serviceTypeFilter {
+		serviceTypes[serviceType] = struct{}{}
+	}
+
 	return &serviceSource{
 		client:                kubeClient,
 		namespace:             namespace,
@@ -78,6 +86,7 @@ func NewServiceSource(kubeClient kubernetes.Interface, namespace, annotationFilt
 		combineFQDNAnnotation: combineFqdnAnnotation,
 		publishInternal:       publishInternal,
 		publishHostIP:         publishHostIP,
+		serviceTypeFilter:     serviceTypes,
 	}, nil
 }
 
@@ -92,6 +101,11 @@ func (sc *serviceSource) Endpoints() ([]*endpoint.Endpoint, error) {
 		return nil, err
 	}
 
+	// filter on service types if at least one has been provided
+	if len(sc.serviceTypeFilter) > 0 {
+		services.Items = sc.filterByServiceType(services.Items)
+	}
+
 	// get the ip addresses of all the nodes and cache them for this run
 	nodeTargets, err := sc.extractNodeTargets()
 	if err != nil {
@@ -254,6 +268,19 @@ func (sc *serviceSource) filterByAnnotations(services []v1.Service) ([]v1.Servic
 	return filteredList, nil
 }
 
+// filterByServiceType filters services according their types
+func (sc *serviceSource) filterByServiceType(services []v1.Service) []v1.Service {
+	filteredList := []v1.Service{}
+	for _, service := range services {
+		// Check if the service is of the given type or not
+		if _, ok := sc.serviceTypeFilter[string(service.Spec.Type)]; ok {
+			filteredList = append(filteredList, service)
+		}
+	}
+
+	return filteredList
+}
+
 func (sc *serviceSource) setResourceLabel(service v1.Service, endpoints []*endpoint.Endpoint) {
 	for _, ep := range endpoints {
 		ep.Labels[endpoint.ResourceLabelKey] = fmt.Sprintf("service/%s/%s", service.Namespace, service.Name)

source/service_test.go

@@ -50,6 +50,7 @@ func (suite *ServiceSuite) SetupTest() {
 		"",
 		false,
 		false,
+		[]string{},
 	)
 	suite.fooWithTargets = &v1.Service{
 		Spec: v1.ServiceSpec{
@@ -99,10 +100,11 @@ func testServiceSourceImplementsSource(t *testing.T) {
 // testServiceSourceNewServiceSource tests that NewServiceSource doesn't return an error.
 func testServiceSourceNewServiceSource(t *testing.T) {
 	for _, ti := range []struct {
-		title            string
+		title              string
-		annotationFilter string
+		annotationFilter   string
-		fqdnTemplate     string
+		fqdnTemplate       string
-		expectError      bool
+		serviceTypesFilter []string
+		expectError        bool
 	}{
 		{
 			title:        "invalid template",
@@ -123,6 +125,11 @@ func testServiceSourceNewServiceSource(t *testing.T) {
 			expectError:      false,
 			annotationFilter: "kubernetes.io/ingress.class=nginx",
 		},
+		{
+			title:              "non-empty service types filter",
+			expectError:        false,
+			serviceTypesFilter: []string{string(v1.ServiceTypeClusterIP)},
+		},
 	} {
 		t.Run(ti.title, func(t *testing.T) {
 			_, err := NewServiceSource(
@@ -134,6 +141,7 @@ func testServiceSourceNewServiceSource(t *testing.T) {
 				"",
 				false,
 				false,
+				ti.serviceTypesFilter,
 			)
 
 			if ti.expectError {
@@ -161,6 +169,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 		annotations              map[string]string
 		clusterIP                string
 		lbs                      []string
+		serviceTypesFilter       []string
 		expected                 []*endpoint.Endpoint
 		expectError              bool
 	}{
@@ -178,6 +187,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			map[string]string{},
 			"",
 			[]string{"1.2.3.4"},
+			[]string{},
 			[]*endpoint.Endpoint{},
 			false,
 		},
@@ -197,6 +207,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"1.2.3.4"},
+			[]string{},
 			[]*endpoint.Endpoint{
 				{DNSName: "foo.example.org", Targets: endpoint.Targets{"1.2.3.4"}},
 			},
@@ -218,6 +229,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"1.2.3.4",
 			[]string{},
+			[]string{},
 			[]*endpoint.Endpoint{},
 			false,
 		},
@@ -235,6 +247,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			map[string]string{},
 			"",
 			[]string{"1.2.3.4"},
+			[]string{},
 			[]*endpoint.Endpoint{
 				{DNSName: "foo.fqdn.org", Targets: endpoint.Targets{"1.2.3.4"}},
 				{DNSName: "foo.fqdn.com", Targets: endpoint.Targets{"1.2.3.4"}},
@@ -257,6 +270,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"1.2.3.4"},
+			[]string{},
 			[]*endpoint.Endpoint{
 				{DNSName: "foo.example.org", Targets: endpoint.Targets{"1.2.3.4"}},
 				{DNSName: "bar.example.org", Targets: endpoint.Targets{"1.2.3.4"}},
@@ -281,6 +295,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"1.2.3.4"},
+			[]string{},
 			[]*endpoint.Endpoint{
 				{DNSName: "foo.example.org", Targets: endpoint.Targets{"1.2.3.4"}},
 				{DNSName: "bar.example.org", Targets: endpoint.Targets{"1.2.3.4"}},
@@ -303,6 +318,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"1.2.3.4"},
+			[]string{},
 			[]*endpoint.Endpoint{
 				{DNSName: "foo.example.org", Targets: endpoint.Targets{"1.2.3.4"}},
 				{DNSName: "bar.example.org", Targets: endpoint.Targets{"1.2.3.4"}},
@@ -325,6 +341,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"lb.example.com"}, // Kubernetes omits the trailing dot
+			[]string{},
 			[]*endpoint.Endpoint{
 				{DNSName: "foo.example.org", Targets: endpoint.Targets{"lb.example.com"}},
 			},
@@ -346,6 +363,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"1.2.3.4", "lb.example.com"}, // Kubernetes omits the trailing dot
+			[]string{},
 			[]*endpoint.Endpoint{
 				{DNSName: "foo.example.org", Targets: endpoint.Targets{"1.2.3.4"}},
 				{DNSName: "foo.example.org", Targets: endpoint.Targets{"lb.example.com"}},
@@ -369,6 +387,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"1.2.3.4"},
+			[]string{},
 			[]*endpoint.Endpoint{
 				{DNSName: "foo.example.org", Targets: endpoint.Targets{"1.2.3.4"}},
 			},
@@ -391,6 +410,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"1.2.3.4"},
+			[]string{},
 			[]*endpoint.Endpoint{},
 			false,
 		},
@@ -410,6 +430,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"1.2.3.4"},
+			[]string{},
 			[]*endpoint.Endpoint{
 				{DNSName: "foo.example.org", Targets: endpoint.Targets{"1.2.3.4"}},
 			},
@@ -431,6 +452,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"1.2.3.4"},
+			[]string{},
 			[]*endpoint.Endpoint{},
 			false,
 		},
@@ -450,6 +472,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"1.2.3.4"},
+			[]string{},
 			[]*endpoint.Endpoint{
 				{DNSName: "foo.example.org", Targets: endpoint.Targets{"1.2.3.4"}},
 			},
@@ -472,6 +495,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"1.2.3.4"},
+			[]string{},
 			[]*endpoint.Endpoint{
 				{DNSName: "foo.example.org", Targets: endpoint.Targets{"1.2.3.4"}},
 			},
@@ -494,6 +518,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"1.2.3.4"},
+			[]string{},
 			[]*endpoint.Endpoint{},
 			false,
 		},
@@ -514,6 +539,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"1.2.3.4"},
+			[]string{},
 			[]*endpoint.Endpoint{},
 			true,
 		},
@@ -534,6 +560,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"1.2.3.4"},
+			[]string{},
 			[]*endpoint.Endpoint{
 				{DNSName: "foo.example.org", Targets: endpoint.Targets{"1.2.3.4"}},
 			},
@@ -556,6 +583,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"1.2.3.4"},
+			[]string{},
 			[]*endpoint.Endpoint{},
 			false,
 		},
@@ -575,6 +603,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{},
+			[]string{},
 			[]*endpoint.Endpoint{},
 			false,
 		},
@@ -594,6 +623,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"1.2.3.4", "8.8.8.8"},
+			[]string{},
 			[]*endpoint.Endpoint{
 				{DNSName: "foo.example.org", Targets: endpoint.Targets{"1.2.3.4", "8.8.8.8"}},
 			},
@@ -615,6 +645,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"1.2.3.4"},
+			[]string{},
 			[]*endpoint.Endpoint{},
 			false,
 		},
@@ -634,6 +665,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"1.2.3.4"},
+			[]string{},
 			[]*endpoint.Endpoint{
 				{DNSName: "foo.example.org", Targets: endpoint.Targets{"1.2.3.4"}},
 			},
@@ -657,6 +689,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"1.2.3.4"},
+			[]string{},
 			[]*endpoint.Endpoint{
 				{DNSName: "foo.example.org", Targets: endpoint.Targets{"1.2.3.4"}},
 				{DNSName: "bar.example.org", Targets: endpoint.Targets{"1.2.3.4"}},
@@ -677,6 +710,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			map[string]string{},
 			"",
 			[]string{"1.2.3.4", "elb.com"},
+			[]string{},
 			[]*endpoint.Endpoint{
 				{DNSName: "foo.bar.example.com", Targets: endpoint.Targets{"1.2.3.4"}},
 				{DNSName: "foo.bar.example.com", Targets: endpoint.Targets{"elb.com"}},
@@ -699,6 +733,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"1.2.3.4", "elb.com"},
+			[]string{},
 			[]*endpoint.Endpoint{
 				{DNSName: "foo.example.org", Targets: endpoint.Targets{"1.2.3.4"}},
 				{DNSName: "foo.example.org", Targets: endpoint.Targets{"elb.com"}},
@@ -721,6 +756,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"1.2.3.4"},
+			[]string{},
 			[]*endpoint.Endpoint{
 				{DNSName: "mate.example.org", Targets: endpoint.Targets{"1.2.3.4"}},
 			},
@@ -740,6 +776,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			map[string]string{},
 			"",
 			[]string{"1.2.3.4"},
+			[]string{},
 			[]*endpoint.Endpoint{},
 			true,
 		},
@@ -759,6 +796,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"1.2.3.4"},
+			[]string{},
 			[]*endpoint.Endpoint{
 				{DNSName: "foo.example.org", Targets: endpoint.Targets{"1.2.3.4"}, RecordTTL: endpoint.TTL(0)},
 			},
@@ -781,6 +819,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"1.2.3.4"},
+			[]string{},
 			[]*endpoint.Endpoint{
 				{DNSName: "foo.example.org", Targets: endpoint.Targets{"1.2.3.4"}, RecordTTL: endpoint.TTL(0)},
 			},
@@ -803,6 +842,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"1.2.3.4"},
+			[]string{},
 			[]*endpoint.Endpoint{
 				{DNSName: "foo.example.org", Targets: endpoint.Targets{"1.2.3.4"}, RecordTTL: endpoint.TTL(10)},
 			},
@@ -825,11 +865,54 @@ func testServiceSourceEndpoints(t *testing.T) {
 			},
 			"",
 			[]string{"1.2.3.4"},
+			[]string{},
 			[]*endpoint.Endpoint{
 				{DNSName: "foo.example.org", Targets: endpoint.Targets{"1.2.3.4"}, RecordTTL: endpoint.TTL(0)},
 			},
 			false,
 		},
+		{
+			"filter on service types should include matching services",
+			"",
+			"",
+			"testing",
+			"foo",
+			v1.ServiceTypeLoadBalancer,
+			"",
+			"",
+			false,
+			map[string]string{},
+			map[string]string{
+				hostnameAnnotationKey: "foo.example.org.",
+			},
+			"",
+			[]string{"1.2.3.4"},
+			[]string{string(v1.ServiceTypeLoadBalancer)},
+			[]*endpoint.Endpoint{
+				{DNSName: "foo.example.org", Targets: endpoint.Targets{"1.2.3.4"}},
+			},
+			false,
+		},
+		{
+			"filter on service types should exclude non-matching services",
+			"",
+			"",
+			"testing",
+			"foo",
+			v1.ServiceTypeNodePort,
+			"",
+			"",
+			false,
+			map[string]string{},
+			map[string]string{
+				hostnameAnnotationKey: "foo.example.org.",
+			},
+			"",
+			[]string{"1.2.3.4"},
+			[]string{string(v1.ServiceTypeLoadBalancer)},
+			[]*endpoint.Endpoint{},
+			false,
+		},
 	} {
 		t.Run(tc.title, func(t *testing.T) {
 			// Create a Kubernetes testing client
@@ -876,6 +959,7 @@ func testServiceSourceEndpoints(t *testing.T) {
 				tc.compatibility,
 				false,
 				false,
+				tc.serviceTypesFilter,
 			)
 			require.NoError(t, err)
 
@@ -1010,6 +1094,7 @@ func TestClusterIpServices(t *testing.T) {
 				tc.compatibility,
 				true,
 				false,
+				[]string{},
 			)
 			require.NoError(t, err)
 
@@ -1206,6 +1291,7 @@ func TestNodePortServices(t *testing.T) {
 				tc.compatibility,
 				true,
 				false,
+				[]string{},
 			)
 			require.NoError(t, err)
 
@@ -1406,6 +1492,7 @@ func TestHeadlessServices(t *testing.T) {
 				tc.compatibility,
 				true,
 				false,
+				[]string{},
 			)
 			require.NoError(t, err)
 
@@ -1606,6 +1693,7 @@ func TestHeadlessServicesHostIP(t *testing.T) {
 				tc.compatibility,
 				true,
 				true,
+				[]string{},
 			)
 			require.NoError(t, err)
 
@@ -1646,7 +1734,7 @@ func BenchmarkServiceEndpoints(b *testing.B) {
 	_, err := kubernetes.CoreV1().Services(service.Namespace).Create(service)
 	require.NoError(b, err)
 
-	client, err := NewServiceSource(kubernetes, v1.NamespaceAll, "", "", false, "", false, false)
+	client, err := NewServiceSource(kubernetes, v1.NamespaceAll, "", "", false, "", false, false, []string{})
 	require.NoError(b, err)
 
 	for i := 0; i < b.N; i++ {

source/store.go

@@ -44,6 +44,7 @@ type Config struct {
 	PublishInternal          bool
 	PublishHostIP            bool
 	ConnectorServer          string
+	ServiceTypeFilter        []string
 }
 
 // ClientGenerator provides clients
@@ -92,7 +93,7 @@ func BuildWithConfig(source string, p ClientGenerator, cfg *Config) (Source, err
 		if err != nil {
 			return nil, err
 		}
-		return NewServiceSource(client, cfg.Namespace, cfg.AnnotationFilter, cfg.FQDNTemplate, cfg.CombineFQDNAndAnnotation, cfg.Compatibility, cfg.PublishInternal, cfg.PublishHostIP)
+		return NewServiceSource(client, cfg.Namespace, cfg.AnnotationFilter, cfg.FQDNTemplate, cfg.CombineFQDNAndAnnotation, cfg.Compatibility, cfg.PublishInternal, cfg.PublishHostIP, cfg.ServiceTypeFilter)
 	case "ingress":
 		client, err := p.KubeClient()
 		if err != nil {