fix: kubernetes watch and list in all namespaces (#112)

* watch and list in all namespaces

* add flag

* update readme

* cleaning

* fmt

Co-authored-by: Eric Yang <ericyang@birentech.com>

plugin/kubernetes/README.md

@@ -6,6 +6,7 @@ this plugin is inpsired by the [first version kubernetes plugin](https://github.
 
 ## Usage
 
+Start plugin with flag `--all-namespaces` or environment variable `SSHPIPERD_KUBERNETES_ALL_NAMESPACES=true` for cluster-wide usage, or it will listen to the namespace where it is in by default.
 
 ### Apply CRD definition
 

plugin/kubernetes/kubernetes.go

@@ -32,7 +32,7 @@ type plugin struct {
 	cache     *gocache.Cache
 }
 
-func newKubernetesPlugin() (*plugin, error) {
+func newKubernetesPlugin(allNamespaces bool) (*plugin, error) {
 	kubeConfig := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
 		clientcmd.NewDefaultClientConfigLoadingRules(),
 		&clientcmd.ConfigOverrides{},
@@ -47,6 +47,9 @@ func newKubernetesPlugin() (*plugin, error) {
 	if err != nil {
 		return nil, err
 	}
+	if allNamespaces {
+		ns = metav1.NamespaceAll
+	}
 
 	k8sclient, err := kubernetes.NewForConfig(config)
 	if err != nil {

plugin/kubernetes/main.go

@@ -9,14 +9,20 @@ func main() {
 	libplugin.CreateAndRunPluginTemplate(&libplugin.PluginTemplate{
 		Name:  "kubernetes",
 		Usage: "sshpiperd kubernetes plugin",
+		Flags: []cli.Flag{
+			&cli.BoolFlag{
+				Name:     "all-namespaces",
+				Usage:    "To watch all namespaces in the cluster",
+				EnvVars:  []string{"SSHPIPERD_KUBERNETES_ALL_NAMESPACES"},
+				Required: false,
+			},
+		},
 		CreateConfig: func(c *cli.Context) (*libplugin.SshPiperPluginConfig, error) {
-			plugin, err := newKubernetesPlugin()
+			plugin, err := newKubernetesPlugin(c.Bool("all-namespaces"))
 			if err != nil {
 				return nil, err
 			}
-
 			return &libplugin.SshPiperPluginConfig{
-
 				NextAuthMethodsCallback: func(_ libplugin.ConnMetadata) ([]string, error) {
 					return plugin.supportedMethods()
 				},