Initial v1.0.0 commit

vendor/sigs.k8s.io/controller-runtime/pkg/source/internal/eventsource.go

@@ -0,0 +1,138 @@
+/*
+Copyright 2018 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 internal
+
+import (
+	"fmt"
+
+	"k8s.io/client-go/tools/cache"
+	"k8s.io/client-go/util/workqueue"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	"sigs.k8s.io/controller-runtime/pkg/event"
+	"sigs.k8s.io/controller-runtime/pkg/handler"
+	logf "sigs.k8s.io/controller-runtime/pkg/internal/log"
+
+	"sigs.k8s.io/controller-runtime/pkg/predicate"
+)
+
+var log = logf.RuntimeLog.WithName("source").WithName("EventHandler")
+
+var _ cache.ResourceEventHandler = EventHandler{}
+
+// EventHandler adapts a handler.EventHandler interface to a cache.ResourceEventHandler interface
+type EventHandler struct {
+	EventHandler handler.EventHandler
+	Queue        workqueue.RateLimitingInterface
+	Predicates   []predicate.Predicate
+}
+
+// OnAdd creates CreateEvent and calls Create on EventHandler
+func (e EventHandler) OnAdd(obj interface{}) {
+	c := event.CreateEvent{}
+
+	// Pull Object out of the object
+	if o, ok := obj.(client.Object); ok {
+		c.Object = o
+	} else {
+		log.Error(nil, "OnAdd missing Object",
+			"object", obj, "type", fmt.Sprintf("%T", obj))
+		return
+	}
+
+	for _, p := range e.Predicates {
+		if !p.Create(c) {
+			return
+		}
+	}
+
+	// Invoke create handler
+	e.EventHandler.Create(c, e.Queue)
+}
+
+// OnUpdate creates UpdateEvent and calls Update on EventHandler
+func (e EventHandler) OnUpdate(oldObj, newObj interface{}) {
+	u := event.UpdateEvent{}
+
+	if o, ok := oldObj.(client.Object); ok {
+		u.ObjectOld = o
+	} else {
+		log.Error(nil, "OnUpdate missing ObjectOld",
+			"object", oldObj, "type", fmt.Sprintf("%T", oldObj))
+		return
+	}
+
+	// Pull Object out of the object
+	if o, ok := newObj.(client.Object); ok {
+		u.ObjectNew = o
+	} else {
+		log.Error(nil, "OnUpdate missing ObjectNew",
+			"object", newObj, "type", fmt.Sprintf("%T", newObj))
+		return
+	}
+
+	for _, p := range e.Predicates {
+		if !p.Update(u) {
+			return
+		}
+	}
+
+	// Invoke update handler
+	e.EventHandler.Update(u, e.Queue)
+}
+
+// OnDelete creates DeleteEvent and calls Delete on EventHandler
+func (e EventHandler) OnDelete(obj interface{}) {
+	d := event.DeleteEvent{}
+
+	// Deal with tombstone events by pulling the object out.  Tombstone events wrap the object in a
+	// DeleteFinalStateUnknown struct, so the object needs to be pulled out.
+	// Copied from sample-controller
+	// This should never happen if we aren't missing events, which we have concluded that we are not
+	// and made decisions off of this belief.  Maybe this shouldn't be here?
+	var ok bool
+	if _, ok = obj.(client.Object); !ok {
+		// If the object doesn't have Metadata, assume it is a tombstone object of type DeletedFinalStateUnknown
+		tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
+		if !ok {
+			log.Error(nil, "Error decoding objects.  Expected cache.DeletedFinalStateUnknown",
+				"type", fmt.Sprintf("%T", obj),
+				"object", obj)
+			return
+		}
+
+		// Set obj to the tombstone obj
+		obj = tombstone.Obj
+	}
+
+	// Pull Object out of the object
+	if o, ok := obj.(client.Object); ok {
+		d.Object = o
+	} else {
+		log.Error(nil, "OnDelete missing Object",
+			"object", obj, "type", fmt.Sprintf("%T", obj))
+		return
+	}
+
+	for _, p := range e.Predicates {
+		if !p.Delete(d) {
+			return
+		}
+	}
+
+	// Invoke delete handler
+	e.EventHandler.Delete(d, e.Queue)
+}