Don't remove ingress config on API call failure

pkg/provider/kubernetes/ingress/client.go

@@ -60,7 +60,7 @@ type Client interface {
 	GetSecret(namespace, name string) (*corev1.Secret, bool, error)
 	GetEndpoints(namespace, name string) (*corev1.Endpoints, bool, error)
 	UpdateIngressStatus(ing *networkingv1beta1.Ingress, ingStatus []corev1.LoadBalancerIngress) error
-	GetServerVersion() (*version.Version, error)
+	GetServerVersion() *version.Version
 }
 
 type clientWrapper struct {
@@ -72,6 +72,7 @@ type clientWrapper struct {
 	ingressLabelSelector string
 	isNamespaceAll       bool
 	watchedNamespaces    []string
+	serverVersion        *version.Version
 }
 
 // newInClusterClient returns a new Provider client that is expected to run
@@ -208,12 +209,18 @@ func (c *clientWrapper) WatchAll(namespaces []string, stopCh <-chan struct{}) (<
 		}
 	}
 
-	serverVersion, err := c.GetServerVersion()
+	// Get and store the serverVersion for future use.
+	serverVersionInfo, err := c.clientset.Discovery().ServerVersion()
 	if err != nil {
-		log.WithoutContext().Errorf("Failed to get server version: %v", err)
-		return eventCh, nil
+		return eventCh, fmt.Errorf("could not retrieve server version: %w", err)
 	}
 
+	serverVersion, err := version.NewVersion(serverVersionInfo.GitVersion)
+	if err != nil {
+		return eventCh, fmt.Errorf("could not parse server version: %w", err)
+	}
+
+	c.serverVersion = serverVersion
 	if supportsIngressClass(serverVersion) {
 		c.clusterFactory = informers.NewSharedInformerFactoryWithOptions(c.clientset, resyncPeriod)
 		c.clusterFactory.Networking().V1beta1().IngressClasses().Informer().AddEventHandler(eventHandler)
@@ -426,13 +433,8 @@ func (c *clientWrapper) lookupNamespace(ns string) string {
 }
 
 // GetServerVersion returns the cluster server version, or an error.
-func (c *clientWrapper) GetServerVersion() (*version.Version, error) {
-	serverVersion, err := c.clientset.Discovery().ServerVersion()
-	if err != nil {
-		return nil, fmt.Errorf("could not retrieve server version: %w", err)
-	}
-
-	return version.NewVersion(serverVersion.GitVersion)
+func (c *clientWrapper) GetServerVersion() *version.Version {
+	return c.serverVersion
 }
 
 // eventHandlerFunc will pass the obj on to the events channel or drop it.

pkg/provider/kubernetes/ingress/client_mock_test.go

@@ -73,8 +73,8 @@ func (c clientMock) GetIngresses() []*networkingv1beta1.Ingress {
 	return c.ingresses
 }
 
-func (c clientMock) GetServerVersion() (*version.Version, error) {
-	return c.serverVersion, nil
+func (c clientMock) GetServerVersion() *version.Version {
+	return c.serverVersion
 }
 
 func (c clientMock) GetService(namespace, name string) (*corev1.Service, bool, error) {

pkg/provider/kubernetes/ingress/client_test.go

@@ -1,6 +1,7 @@
 package ingress
 
 import (
+	"errors"
 	"fmt"
 	"testing"
 	"time"
@@ -154,7 +155,8 @@ func TestClientIgnoresHelmOwnedSecrets(t *testing.T) {
 	stopCh := make(chan struct{})
 
 	eventCh, err := client.WatchAll(nil, stopCh)
-	require.NoError(t, err)
+	// Fake clientset always returns this exact serverVersion that fails our validation.
+	require.Error(t, errors.New(`could not parse server version: Malformed version: v0.0.0-master+$Format:%h$`), err)
 
 	select {
 	case event := <-eventCh:

pkg/provider/kubernetes/ingress/kubernetes.go

@@ -189,11 +189,7 @@ func (p *Provider) loadConfigurationFromIngresses(ctx context.Context, client Cl
 		TCP: &dynamic.TCPConfiguration{},
 	}
 
-	serverVersion, err := client.GetServerVersion()
-	if err != nil {
-		log.FromContext(ctx).Errorf("Failed to get server version: %v", err)
-		return conf
-	}
+	serverVersion := client.GetServerVersion()
 
 	var ingressClasses []*networkingv1beta1.IngressClass