fix(notifications): Allow notifications controller to notify on all namespaces (cherry-pick 2.6)

cmd/argocd-notification/commands/controller.go

@@ -55,6 +55,7 @@ func NewCommand() *cobra.Command {
 		argocdRepoServerStrictTLS bool
 		configMapName             string
 		secretName                string
+		applicationNamespaces     []string
 	)
 	var command = cobra.Command{
 		Use:   "controller",
@@ -138,7 +139,7 @@ func NewCommand() *cobra.Command {
 			log.Infof("serving metrics on port %d", metricsPort)
 			log.Infof("loading configuration %d", metricsPort)
 
-			ctrl := notificationscontroller.NewController(k8sClient, dynamicClient, argocdService, namespace, appLabelSelector, registry, secretName, configMapName)
+			ctrl := notificationscontroller.NewController(k8sClient, dynamicClient, argocdService, namespace, applicationNamespaces, appLabelSelector, registry, secretName, configMapName)
 			err = ctrl.Init(ctx)
 			if err != nil {
 				return err
@@ -161,5 +162,6 @@ func NewCommand() *cobra.Command {
 	command.Flags().BoolVar(&argocdRepoServerStrictTLS, "argocd-repo-server-strict-tls", false, "Perform strict validation of TLS certificates when connecting to repo server")
 	command.Flags().StringVar(&configMapName, "config-map-name", "argocd-notifications-cm", "Set notifications ConfigMap name")
 	command.Flags().StringVar(&secretName, "secret-name", "argocd-notifications-secret", "Set notifications Secret name")
+	command.Flags().StringSliceVar(&applicationNamespaces, "application-namespaces", env.StringsFromEnv("ARGOCD_APPLICATION_NAMESPACES", []string{}, ","), "List of additional namespaces that this controller should send notifications for")
 	return &command
 }

docs/operator-manual/app-any-namespace.md

@@ -71,6 +71,8 @@ We supply a `ClusterRole` and `ClusterRoleBinding` suitable for this purpose in
 kubectl apply -f examples/k8s-rbac/argocd-server-applications/
 ```
 
+`argocd-notifications-controller-rbac-clusterrole.yaml` and `argocd-notifications-controller-rbac-clusterrolebinding.yaml` are used to support notifications controller to notify apps in all namespaces.
+
 !!! note
     At some later point in time, we may make this cluster role part of the default installation manifests.
 

examples/k8s-rbac/argocd-server-applications/argocd-notifications-controller-rbac-clusterrole.yaml

@@ -0,0 +1,19 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  labels:
+    app.kubernetes.io/name: argocd-notifications-controller-cluster-apps
+    app.kubernetes.io/part-of: argocd
+    app.kubernetes.io/component: notifications-controller
+  name: argocd-notifications-controller-cluster-apps
+rules:
+- apiGroups:
+  - "argoproj.io"
+  resources:
+  - "applications"
+  verbs:
+  - get
+  - list
+  - watch
+  - update
+  - patch

examples/k8s-rbac/argocd-server-applications/argocd-notifications-controller-rbac-clusterrolebinding.yaml

@@ -0,0 +1,16 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  labels:
+    app.kubernetes.io/name: argocd-notifications-controller-cluster-apps
+    app.kubernetes.io/part-of: argocd
+    app.kubernetes.io/component: notifications-controller
+  name: argocd-notifications-controller-cluster-apps
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: argocd-notifications-controller-cluster-apps
+subjects:
+- kind: ServiceAccount
+  name: argocd-notifications-controller
+  namespace: argocd

manifests/base/notification/argocd-notifications-controller-deployment.yaml

@@ -31,6 +31,13 @@ spec:
       containers:
         - command:
             - argocd-notifications
+          env:
+            - name: ARGOCD_APPLICATION_NAMESPACES
+              valueFrom:
+                configMapKeyRef:
+                  key: application.namespaces
+                  name: argocd-cmd-params-cm
+                  optional: true
           workingDir: /app
           livenessProbe:
             tcpSocket:

manifests/ha/install.yaml

@@ -16921,6 +16921,13 @@ spec:
       containers:
       - command:
         - argocd-notifications
+        env:
+        - name: ARGOCD_APPLICATION_NAMESPACES
+          valueFrom:
+            configMapKeyRef:
+              key: application.namespaces
+              name: argocd-cmd-params-cm
+              optional: true
         image: quay.io/argoproj/argocd:v2.6.15
         imagePullPolicy: Always
         livenessProbe:

manifests/ha/namespace-install.yaml

@@ -1725,6 +1725,13 @@ spec:
       containers:
       - command:
         - argocd-notifications
+        env:
+        - name: ARGOCD_APPLICATION_NAMESPACES
+          valueFrom:
+            configMapKeyRef:
+              key: application.namespaces
+              name: argocd-cmd-params-cm
+              optional: true
         image: quay.io/argoproj/argocd:v2.6.15
         imagePullPolicy: Always
         livenessProbe:

manifests/install.yaml

@@ -16040,6 +16040,13 @@ spec:
       containers:
       - command:
         - argocd-notifications
+        env:
+        - name: ARGOCD_APPLICATION_NAMESPACES
+          valueFrom:
+            configMapKeyRef:
+              key: application.namespaces
+              name: argocd-cmd-params-cm
+              optional: true
         image: quay.io/argoproj/argocd:v2.6.15
         imagePullPolicy: Always
         livenessProbe:

manifests/namespace-install.yaml

@@ -844,6 +844,13 @@ spec:
       containers:
       - command:
         - argocd-notifications
+        env:
+        - name: ARGOCD_APPLICATION_NAMESPACES
+          valueFrom:
+            configMapKeyRef:
+              key: application.namespaces
+              name: argocd-cmd-params-cm
+              optional: true
         image: quay.io/argoproj/argocd:v2.6.15
         imagePullPolicy: Always
         livenessProbe:

notification_controller/controller/controller.go

@@ -6,6 +6,8 @@ import (
 	"fmt"
 	"time"
 
+	"github.com/argoproj/argo-cd/v2/util/glob"
+
 	"github.com/argoproj/argo-cd/v2/util/notification/k8s"
 
 	service "github.com/argoproj/argo-cd/v2/util/notification/argocd"
@@ -52,14 +54,15 @@ func NewController(
 	client dynamic.Interface,
 	argocdService service.Service,
 	namespace string,
+	applicationNamespaces []string,
 	appLabelSelector string,
 	registry *controller.MetricsRegistry,
 	secretName string,
 	configMapName string,
 ) *notificationController {
 	appClient := client.Resource(applications)
-	appInformer := newInformer(appClient.Namespace(namespace), appLabelSelector)
-	appProjInformer := newInformer(newAppProjClient(client, namespace), "")
+	appInformer := newInformer(appClient, namespace, applicationNamespaces, appLabelSelector)
+	appProjInformer := newInformer(newAppProjClient(client, namespace), namespace, []string{namespace}, "")
 	secretInformer := k8s.NewSecretInformer(k8sClient, namespace, secretName)
 	configMapInformer := k8s.NewConfigMapInformer(k8sClient, namespace, configMapName)
 	apiFactory := api.NewFactory(settings.GetFactorySettings(argocdService, secretName, configMapName), namespace, secretInformer, configMapInformer)
@@ -76,13 +79,21 @@ func NewController(
 			if !ok {
 				return false, ""
 			}
+			if checkAppNotInAdditionalNamespaces(app, namespace, applicationNamespaces) {
+				return true, "app is not in one of the application-namespaces, nor the notification controller namespace"
+			}
 			return !isAppSyncStatusRefreshed(app, log.WithField("app", obj.GetName())), "sync status out of date"
 		}),
 		controller.WithMetricsRegistry(registry),
 		controller.WithAlterDestinations(res.alterDestinations))
 	return res
 }
 
+// Check if app is not in the namespace where the controller is in, and also app is not in one of the applicationNamespaces
+func checkAppNotInAdditionalNamespaces(app *unstructured.Unstructured, namespace string, applicationNamespaces []string) bool {
+	return namespace != app.GetNamespace() && !glob.MatchStringInList(applicationNamespaces, app.GetNamespace(), false)
+}
+
 func (c *notificationController) alterDestinations(obj v1.Object, destinations services.Destinations, cfg api.Config) services.Destinations {
 	app, ok := (obj).(*unstructured.Unstructured)
 	if !ok {
@@ -96,21 +107,38 @@ func (c *notificationController) alterDestinations(obj v1.Object, destinations s
 	return destinations
 }
 
-func newInformer(resClient dynamic.ResourceInterface, selector string) cache.SharedIndexInformer {
+func newInformer(resClient dynamic.ResourceInterface, controllerNamespace string, applicationNamespaces []string, selector string) cache.SharedIndexInformer {
 	informer := cache.NewSharedIndexInformer(
 		&cache.ListWatch{
-			ListFunc: func(options v1.ListOptions) (object runtime.Object, err error) {
+			ListFunc: func(options v1.ListOptions) (runtime.Object, error) {
+				// We are only interested in apps that exist in namespaces the
+				// user wants to be enabled.
 				options.LabelSelector = selector
-				return resClient.List(context.Background(), options)
+				appList, err := resClient.List(context.TODO(), options)
+				if err != nil {
+					return nil, fmt.Errorf("failed to list applications: %w", err)
+				}
+				newItems := []unstructured.Unstructured{}
+				for _, res := range appList.Items {
+					if controllerNamespace == res.GetNamespace() || glob.MatchStringInList(applicationNamespaces, res.GetNamespace(), false) {
+						newItems = append(newItems, res)
+					}
+				}
+				appList.Items = newItems
+				return appList, nil
 			},
 			WatchFunc: func(options v1.ListOptions) (watch.Interface, error) {
 				options.LabelSelector = selector
-				return resClient.Watch(context.Background(), options)
+				return resClient.Watch(context.TODO(), options)
 			},
 		},
 		&unstructured.Unstructured{},
 		resyncPeriod,
-		cache.Indexers{},
+		cache.Indexers{
+			cache.NamespaceIndex: func(obj interface{}) ([]string, error) {
+				return cache.MetaNamespaceIndexFunc(obj)
+			},
+		},
 	)
 	return informer
 }

notification_controller/controller/controller_test.go

@@ -0,0 +1,32 @@
+package controller
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+)
+
+func TestCheckAppNotInAdditionalNamespaces(t *testing.T) {
+	app := &unstructured.Unstructured{
+		Object: map[string]interface{}{
+			"spec": map[string]interface{}{},
+		},
+	}
+	namespace := "argocd"
+	var applicationNamespaces []string
+	applicationNamespaces = append(applicationNamespaces, "namespace1")
+	applicationNamespaces = append(applicationNamespaces, "namespace2")
+
+	// app is in same namespace as controller's namespace
+	app.SetNamespace(namespace)
+	assert.False(t, checkAppNotInAdditionalNamespaces(app, namespace, applicationNamespaces))
+
+	// app is not in the namespace as controller's namespace, but it is in one of the applicationNamespaces
+	app.SetNamespace("namespace2")
+	assert.False(t, checkAppNotInAdditionalNamespaces(app, "", applicationNamespaces))
+
+	// app is not in the namespace as controller's namespace, and it is not in any of the applicationNamespaces
+	app.SetNamespace("namespace3")
+	assert.True(t, checkAppNotInAdditionalNamespaces(app, "", applicationNamespaces))
+}