Added Daemonset Status predicate

Added Daemonset Status predicate to optimize watch on DS.
Minor fixes on status update for the controllers by coalescing status
and CR update together.

Issue-ID: ONAPARC-461
Signed-off-by: Dileep Ranganathan <dileep.ranganathan@intel.com>
Change-Id: I2a56f0b93c2d7a56b9e8149c41f8c6f22be86ef1

1 files changed, 65 insertions, 0 deletions

diff --git a/vnfs/DAaaS/microservices/collectd-operator/pkg/controller/utils/predicate.go b/vnfs/DAaaS/microservices/collectd-operator/pkg/controller/utils/predicate.go
new file mode 100644
index 00000000..a9ec1dc4
--- /dev/null
+++ b/vnfs/DAaaS/microservices/collectd-operator/pkg/controller/utils/predicate.go
@@ -0,0 +1,65 @@
+// Copyright 2018 The Operator-SDK 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 utils
+
+import (
+	appsv1 "k8s.io/api/apps/v1"
+
+	"sigs.k8s.io/controller-runtime/pkg/event"
+	"sigs.k8s.io/controller-runtime/pkg/predicate"
+	logf "sigs.k8s.io/controller-runtime/pkg/runtime/log"
+)
+
+var plog = logf.Log.WithName("predicate").WithName("eventFilters")
+
+// DaemonSetStatusChangedPredicate implements a default update predicate function on status change for Daemonsets
+// (adapted from sigs.k8s.io/controller-runtime/pkg/predicate/predicate.GenerationChangedPredicate)
+type DaemonSetStatusChangedPredicate struct {
+	predicate.Funcs
+}
+
+// Update implements default UpdateEvent filter for validating generation change
+func (DaemonSetStatusChangedPredicate) Update(e event.UpdateEvent) bool {
+	newDS := e.ObjectNew.DeepCopyObject().(*appsv1.DaemonSet)
+	oldDS := e.ObjectOld.DeepCopyObject().(*appsv1.DaemonSet)
+	plog.V(2).Info("newDS", "nUNS:=", newDS.Status.UpdatedNumberScheduled, "oUNS:=", oldDS.Status.UpdatedNumberScheduled, "nDNS:=", newDS.Status.DesiredNumberScheduled, "nNR:=", newDS.Status.NumberReady, "nNA:=", newDS.Status.NumberAvailable)
+	if newDS.Status.UpdatedNumberScheduled >= oldDS.Status.UpdatedNumberScheduled {
+		if (newDS.Status.UpdatedNumberScheduled == newDS.Status.NumberReady) &&
+			(newDS.Status.UpdatedNumberScheduled == newDS.Status.NumberAvailable) {
+			return true
+		}
+	}
+	if e.MetaOld == nil {
+		plog.Error(nil, "Update event has no old metadata", "event", e)
+		return false
+	}
+	if e.ObjectOld == nil {
+		plog.Error(nil, "Update event has no old runtime object to update", "event", e)
+		return false
+	}
+	if e.ObjectNew == nil {
+		plog.Error(nil, "Update event has no new runtime object for update", "event", e)
+		return false
+	}
+	if e.MetaNew == nil {
+		plog.Error(nil, "Update event has no new metadata", "event", e)
+		return false
+	}
+	if e.MetaNew.GetGeneration() == e.MetaOld.GetGeneration() {
+		return false
+	}
+
+	return true
+}