chore: move the scheduler internal components out of internal dir

pkg/scheduler/backend/cache/debugger/debugger.go

@@ -0,0 +1,76 @@
+/*
+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 debugger
+
+import (
+	"context"
+	"os"
+	"os/signal"
+
+	corelisters "k8s.io/client-go/listers/core/v1"
+	"k8s.io/klog/v2"
+	internalcache "k8s.io/kubernetes/pkg/scheduler/backend/cache"
+	internalqueue "k8s.io/kubernetes/pkg/scheduler/backend/queue"
+)
+
+// CacheDebugger provides ways to check and write cache information for debugging.
+type CacheDebugger struct {
+	Comparer CacheComparer
+	Dumper   CacheDumper
+}
+
+// New creates a CacheDebugger.
+func New(
+	nodeLister corelisters.NodeLister,
+	podLister corelisters.PodLister,
+	cache internalcache.Cache,
+	podQueue internalqueue.SchedulingQueue,
+) *CacheDebugger {
+	return &CacheDebugger{
+		Comparer: CacheComparer{
+			NodeLister: nodeLister,
+			PodLister:  podLister,
+			Cache:      cache,
+			PodQueue:   podQueue,
+		},
+		Dumper: CacheDumper{
+			cache:    cache,
+			podQueue: podQueue,
+		},
+	}
+}
+
+// ListenForSignal starts a goroutine that will trigger the CacheDebugger's
+// behavior when the process receives SIGINT (Windows) or SIGUSER2 (non-Windows).
+func (d *CacheDebugger) ListenForSignal(ctx context.Context) {
+	logger := klog.FromContext(ctx)
+	stopCh := ctx.Done()
+	ch := make(chan os.Signal, 1)
+	signal.Notify(ch, compareSignal)
+
+	go func() {
+		for {
+			select {
+			case <-stopCh:
+				return
+			case <-ch:
+				d.Comparer.Compare(logger)
+				d.Dumper.DumpAll(logger)
+			}
+		}
+	}()
+}