expose ready/stop channel

pkg/client/unversioned/portforward/portforward.go

@@ -108,7 +108,7 @@ func parsePorts(ports []string) ([]ForwardedPort, error) {
 }
 
 // New creates a new PortForwarder.
-func New(dialer httpstream.Dialer, ports []string, stopChan <-chan struct{}, out, errOut io.Writer) (*PortForwarder, error) {
+func New(dialer httpstream.Dialer, ports []string, stopChan <-chan struct{}, readyChan chan struct{}, out, errOut io.Writer) (*PortForwarder, error) {
 	if len(ports) == 0 {
 		return nil, errors.New("You must specify at least 1 port")
 	}
@@ -120,7 +120,7 @@ func New(dialer httpstream.Dialer, ports []string, stopChan <-chan struct{}, out
 		dialer:   dialer,
 		ports:    parsedPorts,
 		stopChan: stopChan,
-		Ready:    make(chan struct{}),
+		Ready:    readyChan,
 		out:      out,
 		errOut:   errOut,
 	}, nil
@@ -164,7 +164,9 @@ func (pf *PortForwarder) forward() error {
 		return fmt.Errorf("Unable to listen on any of the requested ports: %v", pf.ports)
 	}
 
-	close(pf.Ready)
+	if pf.Ready != nil {
+		close(pf.Ready)
+	}
 
 	// wait for interrupt or conn closure
 	select {

pkg/client/unversioned/portforward/portforward_test.go

@@ -88,7 +88,8 @@ func TestParsePortsAndNew(t *testing.T) {
 
 		dialer := &fakeDialer{}
 		expectedStopChan := make(chan struct{})
-		pf, err := New(dialer, test.input, expectedStopChan, os.Stdout, os.Stderr)
+		readyChan := make(chan struct{})
+		pf, err := New(dialer, test.input, expectedStopChan, readyChan, os.Stdout, os.Stderr)
 		haveError = err != nil
 		if e, a := test.expectNewError, haveError; e != a {
 			t.Fatalf("%d: New: error expected=%t, got %t: %s", i, e, a, err)
@@ -305,8 +306,9 @@ func TestForwardPorts(t *testing.T) {
 		}
 
 		stopChan := make(chan struct{}, 1)
+		readyChan := make(chan struct{})
 
-		pf, err := New(exec, test.ports, stopChan, os.Stdout, os.Stderr)
+		pf, err := New(exec, test.ports, stopChan, readyChan, os.Stdout, os.Stderr)
 		if err != nil {
 			t.Fatalf("%s: unexpected error calling New: %v", testName, err)
 		}
@@ -375,8 +377,9 @@ func TestForwardPortsReturnsErrorWhenAllBindsFailed(t *testing.T) {
 
 	stopChan1 := make(chan struct{}, 1)
 	defer close(stopChan1)
+	readyChan1 := make(chan struct{})
 
-	pf1, err := New(exec, []string{"5555"}, stopChan1, os.Stdout, os.Stderr)
+	pf1, err := New(exec, []string{"5555"}, stopChan1, readyChan1, os.Stdout, os.Stderr)
 	if err != nil {
 		t.Fatalf("error creating pf1: %v", err)
 	}
@@ -384,7 +387,8 @@ func TestForwardPortsReturnsErrorWhenAllBindsFailed(t *testing.T) {
 	<-pf1.Ready
 
 	stopChan2 := make(chan struct{}, 1)
-	pf2, err := New(exec, []string{"5555"}, stopChan2, os.Stdout, os.Stderr)
+	readyChan2 := make(chan struct{})
+	pf2, err := New(exec, []string{"5555"}, stopChan2, readyChan2, os.Stdout, os.Stderr)
 	if err != nil {
 		t.Fatalf("error creating pf2: %v", err)
 	}

pkg/kubectl/cmd/portforward.go

@@ -41,6 +41,8 @@ type PortForwardOptions struct {
 	Client        *client.Client
 	Ports         []string
 	PortForwarder portForwarder
+	StopChannel   chan struct{}
+	ReadyChannel  chan struct{}
 }
 
 var (
@@ -88,19 +90,19 @@ func NewCmdPortForward(f *cmdutil.Factory, cmdOut, cmdErr io.Writer) *cobra.Comm
 }
 
 type portForwarder interface {
-	ForwardPorts(method string, url *url.URL, config *restclient.Config, ports []string, stopChan <-chan struct{}) error
+	ForwardPorts(method string, url *url.URL, opts PortForwardOptions) error
 }
 
 type defaultPortForwarder struct {
 	cmdOut, cmdErr io.Writer
 }
 
-func (f *defaultPortForwarder) ForwardPorts(method string, url *url.URL, config *restclient.Config, ports []string, stopChan <-chan struct{}) error {
-	dialer, err := remotecommand.NewExecutor(config, method, url)
+func (f *defaultPortForwarder) ForwardPorts(method string, url *url.URL, opts PortForwardOptions) error {
+	dialer, err := remotecommand.NewExecutor(opts.Config, method, url)
 	if err != nil {
 		return err
 	}
-	fw, err := portforward.New(dialer, ports, stopChan, f.cmdOut, f.cmdErr)
+	fw, err := portforward.New(dialer, opts.Ports, opts.StopChannel, opts.ReadyChannel, f.cmdOut, f.cmdErr)
 	if err != nil {
 		return err
 	}
@@ -138,6 +140,8 @@ func (o *PortForwardOptions) Complete(f *cmdutil.Factory, cmd *cobra.Command, ar
 		return err
 	}
 
+	o.StopChannel = make(chan struct{}, 1)
+	o.ReadyChannel = make(chan struct{})
 	return nil
 }
 
@@ -165,17 +169,18 @@ func (o PortForwardOptions) RunPortForward() error {
 	}
 
 	if pod.Status.Phase != api.PodRunning {
-		return fmt.Errorf("Unable to execute command because pod is not running. Current status=%v", pod.Status.Phase)
+		return fmt.Errorf("unable to forward port because pod is not running. Current status=%v", pod.Status.Phase)
 	}
 
 	signals := make(chan os.Signal, 1)
 	signal.Notify(signals, os.Interrupt)
 	defer signal.Stop(signals)
 
-	stopCh := make(chan struct{}, 1)
 	go func() {
 		<-signals
-		close(stopCh)
+		if o.StopChannel != nil {
+			close(o.StopChannel)
+		}
 	}()
 
 	req := o.Client.RESTClient.Post().
@@ -184,5 +189,5 @@ func (o PortForwardOptions) RunPortForward() error {
 		Name(pod.Name).
 		SubResource("portforward")
 
-	return o.PortForwarder.ForwardPorts("POST", req.URL(), o.Config, o.Ports, stopCh)
+	return o.PortForwarder.ForwardPorts("POST", req.URL(), o)
 }

pkg/kubectl/cmd/portforward_test.go

@@ -38,7 +38,7 @@ type fakePortForwarder struct {
 	pfErr  error
 }
 
-func (f *fakePortForwarder) ForwardPorts(method string, url *url.URL, config *restclient.Config, ports []string, stopChan <-chan struct{}) error {
+func (f *fakePortForwarder) ForwardPorts(method string, url *url.URL, opts PortForwardOptions) error {
 	f.method = method
 	f.url = url
 	return f.pfErr
@@ -108,7 +108,7 @@ func TestPortForward(t *testing.T) {
 		cmd.Run(cmd, []string{"foo", ":5000", ":1000"})
 
 		if test.pfErr && err != ff.pfErr {
-			t.Errorf("%s: Unexpected exec error: %v", test.name, err)
+			t.Errorf("%s: Unexpected port-forward error: %v", test.name, err)
 		}
 		if !test.pfErr && err != nil {
 			t.Errorf("%s: Unexpected error: %v", test.name, err)
@@ -191,7 +191,7 @@ func TestPortForwardWithPFlag(t *testing.T) {
 		cmd.Run(cmd, []string{":5000", ":1000"})
 
 		if test.pfErr && err != ff.pfErr {
-			t.Errorf("%s: Unexpected exec error: %v", test.name, err)
+			t.Errorf("%s: Unexpected port-forward error: %v", test.name, err)
 		}
 		if !test.pfErr && err != nil {
 			t.Errorf("%s: Unexpected error: %v", test.name, err)