added notifications for nginx provider (#177)

Author: Devaansh-Kumar

pkg/i2gw/providers/ingressnginx/canary.go

@@ -21,6 +21,7 @@ import (
 	"strconv"
 
 	"github.com/kubernetes-sigs/ingress2gateway/pkg/i2gw"
+	"github.com/kubernetes-sigs/ingress2gateway/pkg/i2gw/notifications"
 	"github.com/kubernetes-sigs/ingress2gateway/pkg/i2gw/providers/common"
 	networkingv1 "k8s.io/api/networking/v1"
 	"k8s.io/apimachinery/pkg/types"
@@ -86,9 +87,10 @@ func getPathsByMatchGroups(rg common.IngressRuleGroup) (map[pathMatchKey][]ingre
 }
 
 func patchHTTPRouteWithBackendRefs(httpRoute *gatewayv1.HTTPRoute, backendRefs []gatewayv1.HTTPBackendRef) {
+	var ruleExists bool
 	for _, backendRef := range backendRefs {
 
-		ruleExists := false
+		ruleExists = false
 
 		for j, rule := range httpRoute.Spec.Rules {
 			foundBackendRef := false
@@ -112,6 +114,9 @@ func patchHTTPRouteWithBackendRefs(httpRoute *gatewayv1.HTTPRoute, backendRefs [
 			})
 		}
 	}
+	if ruleExists {
+		notify(notifications.InfoNotification, fmt.Sprintf("parsed canary annotations of ingress and patched %v fields", field.NewPath("httproute", "spec", "rules").Key("").Child("backendRefs")), httpRoute)
+	}
 }
 
 func calculateBackendRefWeight(paths []ingressPath) ([]gatewayv1.HTTPBackendRef, field.ErrorList) {

pkg/i2gw/providers/ingressnginx/notification.go

@@ -0,0 +1,27 @@
+/*
+Copyright 2024 The Kubernetes Authors.
+
+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 ingressnginx
+
+import (
+	"github.com/kubernetes-sigs/ingress2gateway/pkg/i2gw/notifications"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+)
+
+func notify(mType notifications.MessageType, message string, callingObject ...client.Object) {
+	newNotification := notifications.NewNotification(mType, message, callingObject...)
+	notifications.NotificationAggr.DispatchNotification(newNotification, string(Name))
+}