Add proof of concept go ConfigMap watcher

sidecars/geosphere-config-watcher/.gitignore

+src/app
\ No newline at end of file

sidecars/geosphere-config-watcher/Dockerfile

+FROM golang:1.23-bookworm AS build
+COPY src /
+RUN go build -LDFLAGS "-s -w" -o /app
+
+FROM debian AS runtime
+COPY --from=build app .
+ENTRYPOINT /app
+

sidecars/geosphere-config-watcher/src/go.mod

+module geosphere-config-watcher
+
+go 1.18
+
+require (
+	k8s.io/api v0.28.0
+	k8s.io/apimachinery v0.28.0
+	k8s.io/client-go v0.28.0
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/emicklei/go-restful/v3 v3.9.0 // indirect
+	github.com/go-logr/logr v1.2.4 // indirect
+	github.com/go-openapi/jsonpointer v0.19.6 // indirect
+	github.com/go-openapi/jsonreference v0.20.2 // indirect
+	github.com/go-openapi/swag v0.22.3 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/google/gnostic-models v0.6.8 // indirect
+	github.com/google/go-cmp v0.5.9 // indirect
+	github.com/google/gofuzz v1.2.0 // indirect
+	github.com/google/uuid v1.3.0 // indirect
+	github.com/imdario/mergo v0.3.6 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	golang.org/x/net v0.13.0 // indirect
+	golang.org/x/oauth2 v0.8.0 // indirect
+	golang.org/x/sys v0.10.0 // indirect
+	golang.org/x/term v0.10.0 // indirect
+	golang.org/x/text v0.11.0 // indirect
+	golang.org/x/time v0.3.0 // indirect
+	google.golang.org/appengine v1.6.7 // indirect
+	google.golang.org/protobuf v1.30.0 // indirect
+	gopkg.in/inf.v0 v0.9.1 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	k8s.io/klog/v2 v2.100.1 // indirect
+	k8s.io/kube-openapi v0.0.0-20230717233707-2695361300d9 // indirect
+	k8s.io/utils v0.0.0-20230406110748-d93618cff8a2 // indirect
+	sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect
+	sigs.k8s.io/structured-merge-diff/v4 v4.2.3 // indirect
+	sigs.k8s.io/yaml v1.3.0 // indirect
+)

sidecars/geosphere-config-watcher/src/go.sum

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+google.golang.org/protobuf v1.30.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
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sidecars/geosphere-config-watcher/src/main.go

+/*
+Copyright 2016 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.
+*/
+
+// Note: the example only works with the code within the same release/branch.
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"path/filepath"
+// 	"time"
+	"sync"
+
+// 	"k8s.io/apimachinery/pkg/api/errors"
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/watch"
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/tools/cache"
+	"k8s.io/client-go/tools/clientcmd"
+	"k8s.io/client-go/util/homedir"
+	//"k8s.io/client-go/rest"
+	toolsWatch "k8s.io/client-go/tools/watch"
+)
+
+func main() {
+	var checkInterval int
+	flag.IntVar(&checkInterval, "check-interval", 10, "seconds between API queries")
+	var targetNamespace string
+	flag.StringVar(&targetNamespace, "namespace", "", "namespace to watch")
+
+	var kubeconfig *string
+	if home := homedir.HomeDir(); home != "" {
+		kubeconfig = flag.String("kubeconfig", filepath.Join(home, ".kube", "config"), "(optional) absolute path to the kubeconfig file")
+	} else {
+		kubeconfig = flag.String("kubeconfig", "", "absolute path to the kubeconfig file")
+	}
+	// creates the in-cluster config
+	// config, err := rest.InClusterConfig()
+
+	flag.Parse()
+
+	// use the current context in kubeconfig
+	config, err := clientcmd.BuildConfigFromFlags("", *kubeconfig)
+	if err != nil {
+		panic(err.Error())
+	}
+
+	// create the clientset
+	clientset, err := kubernetes.NewForConfig(config)
+	if err != nil {
+		panic(err.Error())
+	}
+
+    var wg sync.WaitGroup
+    watchConfigMaps(clientset, targetNamespace)
+    wg.Add(1)
+    wg.Wait()
+
+}
+
+func watchConfigMaps(clientset *kubernetes.Clientset, targetNamespace string) {
+    watchFunc := func(options metav1.ListOptions) (watch.Interface, error) {
+        timeOut := int64(60)
+        return clientset.CoreV1().ConfigMaps(targetNamespace).Watch(
+            context.Background(),
+            metav1.ListOptions{
+                TimeoutSeconds: &timeOut,
+                LabelSelector: "app.kubernetes.io/instance=gamma-geosphere-test",
+            },
+        )
+    }
+    watcher, err := toolsWatch.NewRetryWatcher("1", &cache.ListWatch{WatchFunc: watchFunc})
+    if err != nil {
+        panic(err.Error())
+    }
+    for event := range watcher.ResultChan() {
+        item := event.Object.(*corev1.ConfigMap)
+
+        switch event.Type {
+        case watch.Modified:
+        case watch.Bookmark:
+        case watch.Error:
+        case watch.Deleted:
+        case watch.Added:
+            processConfigMap(item.GetName())
+        }
+    }
+}
+
+func processConfigMap(configMapName string) {
+    // TODO: Get a list of all current configmaps and produce one new configmap
+    fmt.Printf("ConfigMap: %s\n", configMapName)
+}
+
+// 	for {
+// 		pods, err := clientset.CoreV1().Pods("").List(context.TODO(), metav1.ListOptions{})
+// 		if err != nil {
+// 			panic(err.Error())
+// 		}
+// 		fmt.Printf("There are %d pods in the cluster\n", len(pods.Items))
+//
+// 		// Examples for error handling:
+// 		// - Use helper functions like e.g. errors.IsNotFound()
+// 		// - And/or cast to StatusError and use its properties like e.g. ErrStatus.Message
+// 		namespace := "default"
+// 		pod := "example-xxxxx"
+// 		_, err = clientset.CoreV1().Pods(namespace).Get(context.TODO(), pod, metav1.GetOptions{})
+// 		if errors.IsNotFound(err) {
+// 			fmt.Printf("Pod %s in namespace %s not found\n", pod, namespace)
+// 		} else if statusError, isStatus := err.(*errors.StatusError); isStatus {
+// 			fmt.Printf("Error getting pod %s in namespace %s: %v\n",
+// 				pod, namespace, statusError.ErrStatus.Message)
+// 		} else if err != nil {
+// 			panic(err.Error())
+// 		} else {
+// 			fmt.Printf("Found pod %s in namespace %s\n", pod, namespace)
+// 		}
+//
+// 		time.Sleep(10 * time.Second)
+// 	}
+// }
+