revert the revert along with fixes to make it pass e2e tests.

cmd/integration/integration.go

@@ -62,7 +62,7 @@ var (
 
 type fakeKubeletClient struct{}
 
-func (fakeKubeletClient) GetPodInfo(host, podNamespace, podID string) (api.PodInfo, error) {
+func (fakeKubeletClient) GetPodInfo(host, podNamespace, podID string) (api.PodContainerInfo, error) {
 	// This is a horrible hack to get around the fact that we can't provide
 	// different port numbers per kubelet...
 	var c client.PodInfoGetter

pkg/api/register.go

@@ -25,6 +25,7 @@ var Scheme = runtime.NewScheme()
 
 func init() {
 	Scheme.AddKnownTypes("",
+		&PodContainerInfo{},
 		&PodList{},
 		&Pod{},
 		&ReplicationControllerList{},
@@ -52,6 +53,7 @@ func init() {
 	Scheme.AddKnownTypeWithName("", "MinionList", &NodeList{})
 }
 
+func (*PodContainerInfo) IsAnAPIObject()          {}
 func (*Pod) IsAnAPIObject()                       {}
 func (*PodList) IsAnAPIObject()                   {}
 func (*ReplicationController) IsAnAPIObject()     {}

pkg/api/types.go

@@ -410,6 +410,13 @@ type ContainerStatus struct {
 // PodInfo contains one entry for every container with available info.
 type PodInfo map[string]ContainerStatus
 
+// PodContainerInfo is a wrapper for PodInfo that can be encode/decoded
+type PodContainerInfo struct {
+	TypeMeta      `json:",inline"`
+	ObjectMeta    `json:"metadata,omitempty"`
+	ContainerInfo PodInfo `json:"containerInfo"`
+}
+
 type RestartPolicyAlways struct{}
 
 // TODO(dchen1107): Define what kinds of failures should restart.

pkg/api/v1beta1/register.go

@@ -31,6 +31,7 @@ func init() {
 
 	api.Scheme.AddKnownTypes("v1beta1",
 		&Pod{},
+		&PodContainerInfo{},
 		&PodList{},
 		&ReplicationController{},
 		&ReplicationControllerList{},
@@ -58,6 +59,7 @@ func init() {
 }
 
 func (*Pod) IsAnAPIObject()                       {}
+func (*PodContainerInfo) IsAnAPIObject()          {}
 func (*PodList) IsAnAPIObject()                   {}
 func (*ReplicationController) IsAnAPIObject()     {}
 func (*ReplicationControllerList) IsAnAPIObject() {}

pkg/api/v1beta1/types.go

@@ -366,6 +366,12 @@ type ContainerStatus struct {
 // PodInfo contains one entry for every container with available info.
 type PodInfo map[string]ContainerStatus
 
+// PodContainerInfo is a wrapper for PodInfo that can be encode/decoded
+type PodContainerInfo struct {
+	TypeMeta      `json:",inline"`
+	ContainerInfo PodInfo `json:"containerInfo" description:"information about each container in this pod"`
+}
+
 type RestartPolicyAlways struct{}
 
 // TODO(dchen1107): Define what kinds of failures should restart

pkg/api/v1beta2/register.go

@@ -31,6 +31,7 @@ func init() {
 
 	api.Scheme.AddKnownTypes("v1beta2",
 		&Pod{},
+		&PodContainerInfo{},
 		&PodList{},
 		&ReplicationController{},
 		&ReplicationControllerList{},
@@ -58,6 +59,7 @@ func init() {
 }
 
 func (*Pod) IsAnAPIObject()                       {}
+func (*PodContainerInfo) IsAnAPIObject()          {}
 func (*PodList) IsAnAPIObject()                   {}
 func (*ReplicationController) IsAnAPIObject()     {}
 func (*ReplicationControllerList) IsAnAPIObject() {}

pkg/api/v1beta2/types.go

@@ -331,6 +331,12 @@ type ContainerStatus struct {
 // PodInfo contains one entry for every container with available info.
 type PodInfo map[string]ContainerStatus
 
+// PodContainerInfo is a wrapper for PodInfo that can be encode/decoded
+type PodContainerInfo struct {
+	TypeMeta      `json:",inline"`
+	ContainerInfo PodInfo `json:"containerInfo" description:"information about each container in this pod"`
+}
+
 type RestartPolicyAlways struct{}
 
 // TODO(dchen1107): Define what kinds of failures should restart.

pkg/api/v1beta3/register.go

@@ -26,6 +26,7 @@ var Codec = runtime.CodecFor(api.Scheme, "v1beta3")
 
 func init() {
 	api.Scheme.AddKnownTypes("v1beta3",
+		&PodContainerInfo{},
 		&Pod{},
 		&PodList{},
 		&PodTemplate{},
@@ -53,6 +54,7 @@ func init() {
 	api.Scheme.AddKnownTypeWithName("v1beta3", "MinionList", &NodeList{})
 }
 
+func (*PodContainerInfo) IsAnAPIObject()          {}
 func (*Pod) IsAnAPIObject()                       {}
 func (*PodList) IsAnAPIObject()                   {}
 func (*PodTemplate) IsAnAPIObject()               {}

pkg/api/v1beta3/types.go

@@ -427,6 +427,13 @@ type ContainerStatus struct {
 // PodInfo contains one entry for every container with available info.
 type PodInfo map[string]ContainerStatus
 
+// PodContainerInfo is a wrapper for PodInfo that can be encode/decoded
+type PodContainerInfo struct {
+	TypeMeta      `json:",inline"`
+	ObjectMeta    `json:"metadata,omitempty"`
+	ContainerInfo PodInfo `json:"containerInfo" description:"information about each container in this pod"`
+}
+
 type RestartPolicyAlways struct{}
 
 // TODO(dchen1107): Define what kinds of failures should restart.

pkg/client/kubelet.go

@@ -17,7 +17,6 @@ limitations under the License.
 package client
 
 import (
-	"encoding/json"
 	"errors"
 	"fmt"
 	"io/ioutil"
@@ -26,6 +25,7 @@ import (
 	"strconv"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/latest"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/health"
 )
 
@@ -48,7 +48,7 @@ type KubeletHealthChecker interface {
 type PodInfoGetter interface {
 	// GetPodInfo returns information about all containers which are part
 	// Returns an api.PodInfo, or an error if one occurs.
-	GetPodInfo(host, podNamespace, podID string) (api.PodInfo, error)
+	GetPodInfo(host, podNamespace, podID string) (api.PodContainerInfo, error)
 }
 
 // HTTPKubeletClient is the default implementation of PodInfoGetter and KubeletHealthchecker, accesses the kubelet over HTTP.
@@ -89,35 +89,35 @@ func (c *HTTPKubeletClient) url(host string) string {
 }
 
 // GetPodInfo gets information about the specified pod.
-func (c *HTTPKubeletClient) GetPodInfo(host, podNamespace, podID string) (api.PodInfo, error) {
+func (c *HTTPKubeletClient) GetPodInfo(host, podNamespace, podID string) (api.PodContainerInfo, error) {
 	request, err := http.NewRequest(
 		"GET",
 		fmt.Sprintf(
-			"%s/podInfo?podID=%s&podNamespace=%s",
+			"%s/api/v1beta1/podInfo?podID=%s&podNamespace=%s",
 			c.url(host),
 			podID,
 			podNamespace),
 		nil)
+	info := api.PodContainerInfo{}
 	if err != nil {
-		return nil, err
+		return info, err
 	}
 	response, err := c.Client.Do(request)
 	if err != nil {
-		return nil, err
+		return info, err
 	}
 	defer response.Body.Close()
 	if response.StatusCode == http.StatusNotFound {
-		return nil, ErrPodInfoNotAvailable
+		return info, ErrPodInfoNotAvailable
 	}
 	body, err := ioutil.ReadAll(response.Body)
 	if err != nil {
-		return nil, err
+		return info, err
 	}
 	// Check that this data can be unmarshalled
-	info := api.PodInfo{}
-	err = json.Unmarshal(body, &info)
+	err = latest.Codec.DecodeInto(body, &info)
 	if err != nil {
-		return nil, err
+		return info, err
 	}
 	return info, nil
 }
@@ -132,8 +132,8 @@ func (c *HTTPKubeletClient) HealthCheck(host string) (health.Status, error) {
 type FakeKubeletClient struct{}
 
 // GetPodInfo is a fake implementation of PodInfoGetter.GetPodInfo.
-func (c FakeKubeletClient) GetPodInfo(host, podNamespace string, podID string) (api.PodInfo, error) {
-	return api.PodInfo{}, errors.New("Not Implemented")
+func (c FakeKubeletClient) GetPodInfo(host, podNamespace string, podID string) (api.PodContainerInfo, error) {
+	return api.PodContainerInfo{}, errors.New("Not Implemented")
 }
 
 func (c FakeKubeletClient) HealthCheck(host string) (health.Status, error) {

pkg/client/kubelet_test.go

@@ -31,8 +31,10 @@ import (
 )
 
 func TestHTTPKubeletClient(t *testing.T) {
-	expectObj := api.PodInfo{
-		"myID": api.ContainerStatus{},
+	expectObj := api.PodContainerInfo{
+		ContainerInfo: map[string]api.ContainerStatus{
+			"myID": {},
+		},
 	}
 	body, err := json.Marshal(expectObj)
 	if err != nil {
@@ -68,14 +70,16 @@ func TestHTTPKubeletClient(t *testing.T) {
 	}
 
 	// reflect.DeepEqual(expectObj, gotObj) doesn't handle blank times well
-	if len(gotObj) != len(expectObj) {
+	if len(gotObj.ContainerInfo) != len(expectObj.ContainerInfo) {
 		t.Errorf("Unexpected response.  Expected: %#v, received %#v", expectObj, gotObj)
 	}
 }
 
 func TestHTTPKubeletClientNotFound(t *testing.T) {
-	expectObj := api.PodInfo{
-		"myID": api.ContainerStatus{},
+	expectObj := api.PodContainerInfo{
+		ContainerInfo: map[string]api.ContainerStatus{
+			"myID": {},
+		},
 	}
 	_, err := json.Marshal(expectObj)
 	if err != nil {

pkg/kubelet/server.go

@@ -35,6 +35,7 @@ import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/healthz"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/httplog"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/dockertools"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 	"github.com/ghodss/yaml"
 	"github.com/golang/glog"
 	"github.com/google/cadvisor/info"
@@ -91,7 +92,8 @@ func NewServer(host HostInterface, updates chan<- interface{}, enableDebuggingHa
 // InstallDefaultHandlers registers the default set of supported HTTP request patterns with the mux.
 func (s *Server) InstallDefaultHandlers() {
 	healthz.InstallHandler(s.mux)
-	s.mux.HandleFunc("/podInfo", s.handlePodInfo)
+	s.mux.HandleFunc("/podInfo", s.handlePodInfoOld)
+	s.mux.HandleFunc("/api/v1beta1/podInfo", s.handlePodInfoVersioned)
 	s.mux.HandleFunc("/boundPods", s.handleBoundPods)
 	s.mux.HandleFunc("/stats/", s.handleStats)
 	s.mux.HandleFunc("/spec/", s.handleSpec)
@@ -249,8 +251,16 @@ func (s *Server) handleBoundPods(w http.ResponseWriter, req *http.Request) {
 	w.Write(data)
 }
 
+func (s *Server) handlePodInfoOld(w http.ResponseWriter, req *http.Request) {
+	s.handlePodInfo(w, req, false)
+}
+
+func (s *Server) handlePodInfoVersioned(w http.ResponseWriter, req *http.Request) {
+	s.handlePodInfo(w, req, true)
+}
+
 // handlePodInfo handles podInfo requests against the Kubelet
-func (s *Server) handlePodInfo(w http.ResponseWriter, req *http.Request) {
+func (s *Server) handlePodInfo(w http.ResponseWriter, req *http.Request, versioned bool) {
 	u, err := url.ParseRequestURI(req.RequestURI)
 	if err != nil {
 		s.error(w, err)
@@ -286,7 +296,7 @@ func (s *Server) handlePodInfo(w http.ResponseWriter, req *http.Request) {
 		s.error(w, err)
 		return
 	}
-	data, err := json.Marshal(info)
+	data, err := exportPodInfo(info, versioned)
 	if err != nil {
 		s.error(w, err)
 		return
@@ -437,3 +447,23 @@ func (s *Server) serveStats(w http.ResponseWriter, req *http.Request) {
 	w.Write(data)
 	return
 }
+
+func exportPodInfo(info api.PodInfo, versioned bool) ([]byte, error) {
+	if versioned {
+		// TODO: support arbitrary versions here
+		codec, err := findCodec("v1beta1")
+		if err != nil {
+			return nil, err
+		}
+		return codec.Encode(&api.PodContainerInfo{ContainerInfo: info})
+	}
+	return json.Marshal(info)
+}
+
+func findCodec(version string) (runtime.Codec, error) {
+	versions, err := latest.InterfacesFor(version)
+	if err != nil {
+		return nil, err
+	}
+	return versions.Codec, nil
+}

pkg/master/pod_cache.go

@@ -33,7 +33,7 @@ type PodCache struct {
 	containerInfo client.PodInfoGetter
 	pods          pod.Registry
 	// This is a map of pod id to a map of container name to the
-	podInfo map[string]api.PodInfo
+	podInfo map[string]api.PodContainerInfo
 	podLock sync.Mutex
 }
 
@@ -42,7 +42,7 @@ func NewPodCache(info client.PodInfoGetter, pods pod.Registry) *PodCache {
 	return &PodCache{
 		containerInfo: info,
 		pods:          pods,
-		podInfo:       map[string]api.PodInfo{},
+		podInfo:       map[string]api.PodContainerInfo{},
 	}
 }
 
@@ -54,12 +54,12 @@ func makePodCacheKey(podNamespace, podID string) string {
 // GetPodInfo implements the PodInfoGetter.GetPodInfo.
 // The returned value should be treated as read-only.
 // TODO: Remove the host from this call, it's totally unnecessary.
-func (p *PodCache) GetPodInfo(host, podNamespace, podID string) (api.PodInfo, error) {
+func (p *PodCache) GetPodInfo(host, podNamespace, podID string) (api.PodContainerInfo, error) {
 	p.podLock.Lock()
 	defer p.podLock.Unlock()
 	value, ok := p.podInfo[makePodCacheKey(podNamespace, podID)]
 	if !ok {
-		return nil, client.ErrPodInfoNotAvailable
+		return api.PodContainerInfo{}, client.ErrPodInfoNotAvailable
 	}
 	return value, nil
 }