feat(tunnel): wire in the tunnel setup and teardown

cmd/helm/delete.go

@@ -24,6 +24,7 @@ var deleteCommand = &cobra.Command{
 	Short:             "Given a release name, delete the release from Kubernetes",
 	Long:              deleteDesc,
 	RunE:              delRelease,
+	PersistentPreRunE: setupConnection,
 }
 
 func init() {

cmd/helm/get.go

@@ -50,6 +50,7 @@ var getCommand = &cobra.Command{
 	Short:             "Download a named release",
 	Long:              getHelp,
 	RunE:              getCmd,
+	PersistentPreRunE: setupConnection,
 }
 
 var getValuesCommand = &cobra.Command{

cmd/helm/helm.go

@@ -50,7 +50,7 @@ var RootCommand = &cobra.Command{
 	Use:               "helm",
 	Short:             "The Helm package manager for Kubernetes.",
 	Long:              globalUsage,
-	PersistentPreRun: bootstrap,
+	PersistentPostRun: teardown,
 }
 
 func init() {
@@ -59,9 +59,6 @@ func init() {
 		home = "$HOME/.helm"
 	}
 	thost := os.Getenv(hostEnvVar)
-	if thost == "" {
-		thost = defaultHost
-	}
 	p := RootCommand.PersistentFlags()
 	p.StringVar(&helmHome, "home", home, "location of your Helm config. Overrides $HELM_HOME.")
 	p.StringVar(&tillerHost, "host", thost, "address of tiller. Overrides $HELM_HOST.")
@@ -74,12 +71,32 @@ func main() {
 	}
 }
 
-func bootstrap(c *cobra.Command, args []string) {
+func setupConnection(c *cobra.Command, args []string) error {
+	if tillerHost == "" {
+		// Should failure fall back to default host?
+		tunnel, err := newTillerPortForwarder()
+		if err != nil {
+			return err
+		}
+
+		tillerHost = fmt.Sprintf(":%d", tunnel.Local)
+		if flagVerbose {
+			fmt.Printf("Created tunnel using local port: '%d'\n", tunnel.Local)
+		}
+	}
+
 	// Set up the gRPC config.
 	helm.Config.ServAddr = tillerHost
 	if flagVerbose {
 		fmt.Printf("Server: %q\n", helm.Config.ServAddr)
 	}
+	return nil
+}
+
+func teardown(c *cobra.Command, args []string) {
+	if tunnel != nil {
+		tunnel.Close()
+	}
 }
 
 func checkArgsLength(expectedNum, actualNum int, requiredArgs ...string) error {

cmd/helm/install.go

@@ -39,6 +39,7 @@ var installCmd = &cobra.Command{
 	Short:             "install a chart archive.",
 	Long:              installDesc,
 	RunE:              runInstall,
+	PersistentPreRunE: setupConnection,
 }
 
 func init() {

cmd/helm/list.go

@@ -42,6 +42,7 @@ var listCommand = &cobra.Command{
 	Long:              listHelp,
 	RunE:              listCmd,
 	Aliases:           []string{"ls"},
+	PersistentPreRunE: setupConnection,
 }
 
 var (

cmd/helm/status.go

@@ -17,6 +17,7 @@ var statusCommand = &cobra.Command{
 	Short:             "Displays the status of the named release",
 	Long:              statusHelp,
 	RunE:              status,
+	PersistentPreRunE: setupConnection,
 }
 
 func init() {

cmd/helm/tunnel.go

@@ -9,12 +9,17 @@ import (
 	"github.com/kubernetes/helm/pkg/kube"
 )
 
+// TODO refactor out this global var
+var tunnel *kube.Tunnel
+
 func newTillerPortForwarder() (*kube.Tunnel, error) {
 	podName, err := getTillerPodName("helm")
 	if err != nil {
 		return nil, err
 	}
-	return kube.New(nil).ForwardPort("helm", podName, 44134)
+	// FIXME use a constain that is accessable on init
+	const tillerPort = 44134
+	return kube.New(nil).ForwardPort("helm", podName, tillerPort)
 }
 
 func getTillerPodName(namespace string) (string, error) {
@@ -23,6 +28,7 @@ func getTillerPodName(namespace string) (string, error) {
 		return "", err
 	}
 
+	// TODO use a const for labels
 	selector := labels.Set{"app": "helm", "name": "tiller"}.AsSelector()
 	options := api.ListOptions{LabelSelector: selector}
 	pods, err := client.Pods(namespace).List(options)