Add watch functionality for Status CR

Status CR gets updated when there is
status update for the resources scheduled
by Rsync. On change to status CR the watch
in the patch will be triggered and the
update can be handled.

Issue-ID: MULTICLOUD-1042
Signed-off-by: Ritu Sood <ritu.sood@intel.com>
Change-Id: I2a46654dca29c05586dbf1e009bec89b0fa75b67

1 files changed, 139 insertions, 0 deletions

diff --git a/src/rsync/pkg/status/status.go b/src/rsync/pkg/status/status.go
new file mode 100644
index 00000000..28bffefd
--- /dev/null
+++ b/src/rsync/pkg/status/status.go
@@ -0,0 +1,139 @@
+/*
+ * Copyright 2020 Intel Corporation, Inc
+ *
+ * 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 status
+
+import (
+	"encoding/json"
+	"fmt"
+	"sync"
+
+	pkgerrors "github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
+
+	v1alpha1 "github.com/onap/multicloud-k8s/src/monitor/pkg/apis/k8splugin/v1alpha1"
+	clientset "github.com/onap/multicloud-k8s/src/monitor/pkg/generated/clientset/versioned"
+	informers "github.com/onap/multicloud-k8s/src/monitor/pkg/generated/informers/externalversions"
+	"k8s.io/client-go/tools/cache"
+	"k8s.io/client-go/tools/clientcmd"
+)
+
+type channelManager struct {
+	channels map[string]chan struct{}
+	sync.Mutex
+}
+
+var channelData channelManager
+
+const monitorLabel = "emco/deployment-id"
+
+// HandleStatusUpdate for an application in a cluster
+// TODO: Add code for specific handling
+func HandleStatusUpdate(provider, name string, id string, v *v1alpha1.ResourceBundleState) error {
+	logrus.Info("label::", id)
+	//status := v.Status.ServiceStatuses
+	//podStatus := v.Status.PodStatuses
+	// Store Pod Status in app context
+	out, _ := json.Marshal(v.Status)
+	logrus.Info("Status::", string(out))
+	return nil
+}
+
+// StartClusterWatcher watches for CR
+// configBytes - Kubectl file data
+func StartClusterWatcher(provider, name string, configBytes []byte) error {
+	key := provider + "+" + name
+	// Get the lock
+	channelData.Lock()
+	defer channelData.Unlock()
+	// For first time
+	if channelData.channels == nil {
+		channelData.channels = make(map[string]chan struct{})
+	}
+	_, ok := channelData.channels[key]
+	if !ok {
+		// Create Channel
+		channelData.channels[key] = make(chan struct{})
+		// Create config
+		config, err := clientcmd.RESTConfigFromKubeConfig(configBytes)
+		if err != nil {
+			logrus.Info(fmt.Sprintf("RESTConfigFromKubeConfig error: %s", err.Error()))
+			return pkgerrors.Wrap(err, "RESTConfigFromKubeConfig error")
+		}
+		k8sClient, err := clientset.NewForConfig(config)
+		if err != nil {
+			return pkgerrors.Wrap(err, "Clientset NewForConfig error")
+		}
+		// Create Informer
+		mInformerFactory := informers.NewSharedInformerFactory(k8sClient, 0)
+		mInformer := mInformerFactory.K8splugin().V1alpha1().ResourceBundleStates().Informer()
+		go scheduleStatus(provider, name, channelData.channels[key], mInformer)
+	}
+	return nil
+}
+
+// StopClusterWatcher stop watching a cluster
+func StopClusterWatcher(provider, name string) {
+	key := provider + "+" + name
+	if channelData.channels != nil {
+		c, ok := channelData.channels[key]
+		if ok {
+			close(c)
+		}
+	}
+}
+
+// CloseAllClusterWatchers close all channels
+func CloseAllClusterWatchers() {
+	if channelData.channels == nil {
+		return
+	}
+	// Close all Channels to stop all watchers
+	for _, e := range channelData.channels {
+		close(e)
+	}
+}
+
+// Per Cluster Go routine to watch CR
+func scheduleStatus(provider, name string, c <-chan struct{}, s cache.SharedIndexInformer) {
+	handlers := cache.ResourceEventHandlerFuncs{
+		AddFunc: func(obj interface{}) {
+			v, ok := obj.(*v1alpha1.ResourceBundleState)
+			if ok {
+				labels := v.GetLabels()
+				l, ok := labels[monitorLabel]
+				if ok {
+					HandleStatusUpdate(provider, name, l, v)
+				}
+			}
+		},
+		UpdateFunc: func(oldObj, obj interface{}) {
+			v, ok := obj.(*v1alpha1.ResourceBundleState)
+			if ok {
+				labels := v.GetLabels()
+				l, ok := labels[monitorLabel]
+				if ok {
+					HandleStatusUpdate(provider, name, l, v)
+				}
+			}
+		},
+		DeleteFunc: func(obj interface{}) {
+			// Ignore it
+		},
+	}
+	s.AddEventHandler(handlers)
+	s.Run(c)
+}