chore: Tidy up dnspolicy controller code and files

Follow on from Kuadrant#937 to
cleanup controller files to bring them more inline with the current sotw
approach.

There are no logical changes in this commit, existing code is just being
moved.

Signed-off-by: Michael Nairn <mnairn@redhat.com>

controllers/dnspolicy_dnsrecords.go

@@ -2,6 +2,8 @@ package controllers
 
 import (
 	"fmt"
+	"net"
+	"strings"
 
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	externaldns "sigs.k8s.io/external-dns/endpoint"
@@ -13,11 +15,14 @@ import (
 	"github.com/kuadrant/kuadrant-operator/api/v1alpha1"
 )
 
-var (
-	ErrNoRoutes    = fmt.Errorf("no routes attached to any gateway listeners")
-	ErrNoAddresses = fmt.Errorf("no valid status addresses to use on gateway")
+const (
+	LabelListenerReference = "kuadrant.io/listener-name"
 )
 
+func dnsRecordName(gatewayName, listenerName string) string {
+	return fmt.Sprintf("%s-%s", gatewayName, listenerName)
+}
+
 func desiredDNSRecord(gateway *gatewayapiv1.Gateway, clusterID string, dnsPolicy *v1alpha1.DNSPolicy, targetListener gatewayapiv1.Listener) (*kuadrantdnsv1alpha1.DNSRecord, error) {
 	rootHost := string(*targetListener.Hostname)
 	var healthCheckSpec *kuadrantdnsv1alpha1.HealthCheckSpec
@@ -61,6 +66,60 @@ func desiredDNSRecord(gateway *gatewayapiv1.Gateway, clusterID string, dnsPolicy
 	return dnsRecord, nil
 }
 
+// GatewayWrapper is a wrapper for gateway to implement interface from the builder
+type GatewayWrapper struct {
+	*gatewayapiv1.Gateway
+	excludedAddresses []string
+}
+
+func NewGatewayWrapper(gateway *gatewayapiv1.Gateway) *GatewayWrapper {
+	return &GatewayWrapper{Gateway: gateway}
+}
+
+func (g *GatewayWrapper) GetAddresses() []builder.TargetAddress {
+	addresses := make([]builder.TargetAddress, len(g.Status.Addresses))
+	for i, address := range g.Status.Addresses {
+		addresses[i] = builder.TargetAddress{
+			Type:  builder.AddressType(*address.Type),
+			Value: address.Value,
+		}
+	}
+	return addresses
+}
+
+func (g *GatewayWrapper) RemoveExcludedStatusAddresses(p *v1alpha1.DNSPolicy) error {
+	g.excludedAddresses = p.Spec.ExcludeAddresses
+	newAddresses := []gatewayapiv1.GatewayStatusAddress{}
+	for _, address := range g.Gateway.Status.Addresses {
+		found := false
+		for _, exclude := range p.Spec.ExcludeAddresses {
+			//Only a CIDR will have  / in the address so attempt to parse fail if not valid
+			if strings.Contains(exclude, "/") {
+				_, network, err := net.ParseCIDR(exclude)
+				if err != nil {
+					return fmt.Errorf("could not parse the CIDR from the excludeAddresses field %w", err)
+				}
+				ip := net.ParseIP(address.Value)
+				// only check addresses that are actually IPs
+				if ip != nil && network.Contains(ip) {
+					found = true
+					break
+				}
+			}
+			if exclude == address.Value {
+				found = true
+				break
+			}
+		}
+		if !found {
+			newAddresses = append(newAddresses, address)
+		}
+	}
+	// setting this in memory only won't be saved to actual gateway
+	g.Status.Addresses = newAddresses
+	return nil
+}
+
 func buildEndpoints(clusterID, hostname string, gateway *gatewayapiv1.Gateway, policy *v1alpha1.DNSPolicy) ([]*externaldns.Endpoint, error) {
 	gw := gateway.DeepCopy()
 	gatewayWrapper := NewGatewayWrapper(gw)

controllers/dns_helper_test.go → controllers/dnspolicy_dnsrecords_test.go

@@ -1,3 +1,5 @@
+//go:build unit
+
 package controllers_test
 
 import (
@@ -9,7 +11,7 @@ import (
 	"github.com/kuadrant/kuadrant-operator/controllers"
 )
 
-func TestRemoveExcludedStatusAddresses(t *testing.T) {
+func TestGatewayWrapper_RemoveExcludedStatusAddresses(t *testing.T) {
 	ipaddress := gatewayapiv1.IPAddressType
 	hostaddress := gatewayapiv1.HostnameAddressType
 	testCases := []struct {

controllers/dnspolicy_metrics.go

@@ -0,0 +1,63 @@
+/*
+Copyright 2024.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package controllers
+
+import (
+	"github.com/prometheus/client_golang/prometheus"
+
+	"k8s.io/apimachinery/pkg/api/meta"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"sigs.k8s.io/controller-runtime/pkg/metrics"
+
+	kuadrantv1alpha1 "github.com/kuadrant/kuadrant-operator/api/v1alpha1"
+)
+
+const (
+	dnsPolicyNameLabel      = "dns_policy_name"
+	dnsPolicyNamespaceLabel = "dns_policy_namespace"
+	dnsPolicyCondition      = "dns_policy_condition"
+)
+
+var (
+	dnsPolicyReady = prometheus.NewGaugeVec(
+		prometheus.GaugeOpts{
+			Name: "kuadrant_dns_policy_ready",
+			Help: "DNS Policy ready",
+		},
+		[]string{dnsPolicyNameLabel, dnsPolicyNamespaceLabel, dnsPolicyCondition})
+)
+
+func emitConditionMetrics(dnsPolicy *kuadrantv1alpha1.DNSPolicy) {
+	readyStatus := meta.FindStatusCondition(dnsPolicy.Status.Conditions, ReadyConditionType)
+	if readyStatus == nil {
+		dnsPolicyReady.WithLabelValues(dnsPolicy.Name, dnsPolicy.Namespace, "true").Set(0)
+		dnsPolicyReady.WithLabelValues(dnsPolicy.Name, dnsPolicy.Namespace, "false").Set(0)
+		dnsPolicyReady.WithLabelValues(dnsPolicy.Name, dnsPolicy.Namespace, "unknown").Set(1)
+	} else if readyStatus.Status != metav1.ConditionTrue {
+		dnsPolicyReady.WithLabelValues(dnsPolicy.Name, dnsPolicy.Namespace, "true").Set(0)
+		dnsPolicyReady.WithLabelValues(dnsPolicy.Name, dnsPolicy.Namespace, "false").Set(1)
+		dnsPolicyReady.WithLabelValues(dnsPolicy.Name, dnsPolicy.Namespace, "unknown").Set(0)
+	} else {
+		dnsPolicyReady.WithLabelValues(dnsPolicy.Name, dnsPolicy.Namespace, "true").Set(1)
+		dnsPolicyReady.WithLabelValues(dnsPolicy.Name, dnsPolicy.Namespace, "false").Set(0)
+		dnsPolicyReady.WithLabelValues(dnsPolicy.Name, dnsPolicy.Namespace, "unknown").Set(0)
+	}
+}
+
+func init() {
+	metrics.Registry.MustRegister(dnsPolicyReady)
+}