Issue #27: Added filter to add warning if pod created without label

pkg/filterengine/filterengine.go

@@ -15,6 +15,7 @@ var (
 	Filters = []Filter{
 		filters.NewImageTagChecker(),
 		filters.NewIngressValidator(),
+		filters.NewPodLabelChecker(),
 	}
 )
 

pkg/filterengine/filters/pod_label_checker.go

@@ -0,0 +1,34 @@
+package filters
+
+import (
+	"github.com/infracloudio/botkube/pkg/events"
+	log "github.com/infracloudio/botkube/pkg/logging"
+
+	apiV1 "k8s.io/api/core/v1"
+)
+
+// PodLabelChecker add recommendations to the event object if pod created without any labels
+type PodLabelChecker struct {
+}
+
+// NewPodLabelChecker creates new PodLabelChecker object
+func NewPodLabelChecker() *PodLabelChecker {
+	return &PodLabelChecker{}
+}
+
+// Run filters and modifies event struct
+func (f *PodLabelChecker) Run(object interface{}, event *events.Event) {
+	if event.Kind != "Pod" && event.Type != "create" {
+		return
+	}
+	podObj, ok := object.(*apiV1.Pod)
+	if !ok {
+		return
+	}
+
+	// Check labels in pod
+	if len(podObj.ObjectMeta.Labels) == 0 {
+		event.Recommendations = append(event.Recommendations, "pod '"+podObj.ObjectMeta.Name+"' creation without labels should be avoided.\n")
+	}
+	log.Logger.Debug("Pod label filter successful!")
+}