feat: add observer

.gitignore

@@ -1,2 +1,245 @@
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+

cmd/observer/main.go

@@ -0,0 +1,55 @@
+/*
+Copyright 2023 The Bestchains 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 main
+
+import (
+	"context"
+	"flag"
+
+	"github.com/bestchains/bc-explorer/pkg/observer"
+
+	"k8s.io/apiserver/pkg/server"
+	"k8s.io/klog/v2"
+)
+
+var (
+	kubeconfig = flag.String("kubeconfig", "", "the path of kube config file")
+	host       = flag.String("host", "", "the host of listener")
+)
+
+func main() {
+	klog.InitFlags(nil)
+	flag.Parse()
+
+	if err := run(); err != nil {
+		klog.Error(err)
+	}
+}
+
+func run() error {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	go func() {
+		stopCh := server.SetupSignalHandler()
+		<-stopCh
+		cancel()
+	}()
+	if err := observer.Run(ctx, *host, *kubeconfig); err != nil {
+		return err
+	}
+	return nil
+}