kubelet: add GetNodeInfo implementation

cmd/integration/integration.go

@@ -97,6 +97,10 @@ func (fakeKubeletClient) GetPodStatus(host, podNamespace, podID string) (api.Pod
 	return r, nil
 }
 
+func (fakeKubeletClient) GetNodeInfo(host string) (api.NodeInfo, error) {
+	return api.NodeInfo{}, nil
+}
+
 func (fakeKubeletClient) HealthCheck(host string) (probe.Result, error) {
 	return probe.Success, nil
 }

pkg/api/register.go

@@ -34,6 +34,7 @@ func init() {
 		&Service{},
 		&NodeList{},
 		&Node{},
+		&NodeInfo{},
 		&Status{},
 		&Endpoints{},
 		&EndpointsList{},
@@ -70,6 +71,7 @@ func (*ServiceList) IsAnAPIObject()               {}
 func (*Endpoints) IsAnAPIObject()                 {}
 func (*EndpointsList) IsAnAPIObject()             {}
 func (*Node) IsAnAPIObject()                      {}
+func (*NodeInfo) IsAnAPIObject()                  {}
 func (*NodeList) IsAnAPIObject()                  {}
 func (*Binding) IsAnAPIObject()                   {}
 func (*Status) IsAnAPIObject()                    {}

pkg/api/types.go

@@ -798,6 +798,13 @@ type NodeStatus struct {
 	Addresses []NodeAddress `json:"addresses,omitempty"`
 }
 
+// NodeInfo is the information collected on the node.
+type NodeInfo struct {
+	TypeMeta `json:",inline"`
+	// Capacity represents the available resources of a node
+	Capacity ResourceList `json:"capacity,omitempty"`
+}
+
 type NodePhase string
 
 // These are the valid phases of node.

pkg/api/v1beta1/register.go

@@ -43,6 +43,7 @@ func init() {
 		&EndpointsList{},
 		&Minion{},
 		&MinionList{},
+		&NodeInfo{},
 		&Binding{},
 		&Status{},
 		&Event{},
@@ -77,6 +78,7 @@ func (*ServiceList) IsAnAPIObject()               {}
 func (*Endpoints) IsAnAPIObject()                 {}
 func (*EndpointsList) IsAnAPIObject()             {}
 func (*Minion) IsAnAPIObject()                    {}
+func (*NodeInfo) IsAnAPIObject()                  {}
 func (*MinionList) IsAnAPIObject()                {}
 func (*Binding) IsAnAPIObject()                   {}
 func (*Status) IsAnAPIObject()                    {}

pkg/api/v1beta1/types.go

@@ -628,6 +628,13 @@ type NodeStatus struct {
 	Addresses []NodeAddress `json:"addresses,omitempty" description:"list of addresses reachable to the node"`
 }
 
+// NodeInfo is the information collected on the node.
+type NodeInfo struct {
+	TypeMeta `json:",inline"`
+	// Capacity represents the available resources.
+	Capacity ResourceList `json:"capacity,omitempty" description:"resource capacity of a node represented as a map of resource name to quantity of resource"`
+}
+
 type NodePhase string
 
 // These are the valid phases of node.

pkg/api/v1beta2/register.go

@@ -42,6 +42,7 @@ func init() {
 		&Endpoints{},
 		&EndpointsList{},
 		&Minion{},
+		&NodeInfo{},
 		&MinionList{},
 		&Binding{},
 		&Status{},
@@ -77,6 +78,7 @@ func (*ServiceList) IsAnAPIObject()               {}
 func (*Endpoints) IsAnAPIObject()                 {}
 func (*EndpointsList) IsAnAPIObject()             {}
 func (*Minion) IsAnAPIObject()                    {}
+func (*NodeInfo) IsAnAPIObject()                  {}
 func (*MinionList) IsAnAPIObject()                {}
 func (*Binding) IsAnAPIObject()                   {}
 func (*Status) IsAnAPIObject()                    {}

pkg/api/v1beta2/types.go

@@ -635,6 +635,13 @@ type NodeStatus struct {
 	Addresses []NodeAddress `json:"addresses,omitempty" description:"list of addresses reachable to the node"`
 }
 
+// NodeInfo is the information collected on the node.
+type NodeInfo struct {
+	TypeMeta `json:",inline"`
+	// Capacity represents the available resources.
+	Capacity ResourceList `json:"capacity,omitempty" description:"resource capacity of a node represented as a map of resource name to quantity of resource"`
+}
+
 // Described the current lifecycle phase of a node.
 //
 // https://github.com/GoogleCloudPlatform/kubernetes/blob/master/docs/node.md#node-phase

pkg/api/v1beta3/register.go

@@ -40,6 +40,7 @@ func init() {
 		&Endpoints{},
 		&EndpointsList{},
 		&Node{},
+		&NodeInfo{},
 		&NodeList{},
 		&Binding{},
 		&Status{},
@@ -75,6 +76,7 @@ func (*ServiceList) IsAnAPIObject()               {}
 func (*Endpoints) IsAnAPIObject()                 {}
 func (*EndpointsList) IsAnAPIObject()             {}
 func (*Node) IsAnAPIObject()                      {}
+func (*NodeInfo) IsAnAPIObject()                  {}
 func (*NodeList) IsAnAPIObject()                  {}
 func (*Binding) IsAnAPIObject()                   {}
 func (*Status) IsAnAPIObject()                    {}

pkg/api/v1beta3/types.go

@@ -829,6 +829,13 @@ type NodeStatus struct {
 	Addresses []NodeAddress `json:"addresses,omitempty" description:"list of addresses reachable to the node"`
 }
 
+// NodeInfo is the information collected on the node.
+type NodeInfo struct {
+	TypeMeta `json:",inline"`
+	// Capacity represents the available resources of a node
+	Capacity ResourceList `json:"capacity,omitempty"`
+}
+
 type NodePhase string
 
 // These are the valid phases of node.

pkg/client/kubelet.go

@@ -29,6 +29,7 @@ import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/latest"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/probe"
 	httprobe "github.com/GoogleCloudPlatform/kubernetes/pkg/probe/http"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 )
 
 // ErrPodInfoNotAvailable may be returned when the requested pod info is not available.
@@ -38,6 +39,7 @@ var ErrPodInfoNotAvailable = errors.New("no pod info available")
 type KubeletClient interface {
 	KubeletHealthChecker
 	PodInfoGetter
+	NodeInfoGetter
 }
 
 // KubeletHealthchecker is an interface for healthchecking kubelets
@@ -53,6 +55,10 @@ type PodInfoGetter interface {
 	GetPodStatus(host, podNamespace, podID string) (api.PodStatusResult, error)
 }
 
+type NodeInfoGetter interface {
+	GetNodeInfo(host string) (api.NodeInfo, error)
+}
+
 // HTTPKubeletClient is the default implementation of PodInfoGetter and KubeletHealthchecker, accesses the kubelet over HTTP.
 type HTTPKubeletClient struct {
 	Client      *http.Client
@@ -102,33 +108,41 @@ func (c *HTTPKubeletClient) url(host, path, query string) string {
 
 // GetPodInfo gets information about the specified pod.
 func (c *HTTPKubeletClient) GetPodStatus(host, podNamespace, podID string) (api.PodStatusResult, error) {
-	query := url.Values{"podID": {podID}, "podNamespace": {podNamespace}}
-	request, err := http.NewRequest("GET", c.url(host, "/api/v1beta1/podInfo", query.Encode()), nil)
 	status := api.PodStatusResult{}
+	query := url.Values{"podID": {podID}, "podNamespace": {podNamespace}}
+	response, err := c.getEntity(host, "/api/v1beta1/podInfo", query.Encode(), &status)
+	if response.StatusCode == http.StatusNotFound {
+		return status, ErrPodInfoNotAvailable
+	}
+	return status, err
+}
+
+// GetNodeInfo gets information about the specified node.
+func (c *HTTPKubeletClient) GetNodeInfo(host string) (api.NodeInfo, error) {
+	info := api.NodeInfo{}
+	_, err := c.getEntity(host, "/api/v1beta1/nodeInfo", "", &info)
+	return info, err
+}
+
+func (c *HTTPKubeletClient) getEntity(host, path, query string, entity runtime.Object) (*http.Response, error) {
+	request, err := http.NewRequest("GET", c.url(host, path, query), nil)
 	if err != nil {
-		return status, err
+		return nil, err
 	}
 	response, err := c.Client.Do(request)
 	if err != nil {
-		return status, err
+		return response, err
 	}
 	defer response.Body.Close()
-	if response.StatusCode == http.StatusNotFound {
-		return status, ErrPodInfoNotAvailable
-	}
 	if response.StatusCode >= 300 || response.StatusCode < 200 {
-		return status, fmt.Errorf("kubelet %q server responded with HTTP error code %d for pod %s/%s", host, response.StatusCode, podNamespace, podID)
+		return response, fmt.Errorf("kubelet %q server responded with HTTP error code %d", host, response.StatusCode)
 	}
 	body, err := ioutil.ReadAll(response.Body)
 	if err != nil {
-		return status, err
+		return response, err
 	}
-	// Check that this data can be unmarshalled
-	err = latest.Codec.DecodeInto(body, &status)
-	if err != nil {
-		return status, err
-	}
-	return status, nil
+	err = latest.Codec.DecodeInto(body, entity)
+	return response, err
 }
 
 func (c *HTTPKubeletClient) HealthCheck(host string) (probe.Result, error) {
@@ -145,6 +159,11 @@ func (c FakeKubeletClient) GetPodStatus(host, podNamespace string, podID string)
 	return api.PodStatusResult{}, errors.New("Not Implemented")
 }
 
+// GetNodeInfo is a fake implementation of PodInfoGetter.GetNodeInfo
+func (c FakeKubeletClient) GetNodeInfo(host string) (api.NodeInfo, error) {
+	return api.NodeInfo{}, errors.New("Not Implemented")
+}
+
 func (c FakeKubeletClient) HealthCheck(host string) (probe.Result, error) {
 	return probe.Unknown, errors.New("Not Implemented")
 }

pkg/cloudprovider/controller/nodecontroller.go

@@ -51,7 +51,7 @@ type NodeController struct {
 	staticResources    *api.NodeResources
 	nodes              []string
 	kubeClient         client.Interface
-	kubeletClient      client.KubeletHealthChecker
+	kubeletClient      client.KubeletClient
 	registerRetryCount int
 	podEvictionTimeout time.Duration
 }
@@ -65,7 +65,7 @@ func NewNodeController(
 	nodes []string,
 	staticResources *api.NodeResources,
 	kubeClient client.Interface,
-	kubeletClient client.KubeletHealthChecker,
+	kubeletClient client.KubeletClient,
 	registerRetryCount int,
 	podEvictionTimeout time.Duration) *NodeController {
 	return &NodeController{
@@ -219,7 +219,7 @@ func (s *NodeController) SyncNodeStatus() error {
 	if err != nil {
 		return err
 	}
-	nodes = s.DoChecks(nodes)
+	nodes = s.UpdateNodesStatus(nodes)
 	nodes, err = s.PopulateAddresses(nodes)
 	if err != nil {
 		return err
@@ -304,13 +304,16 @@ func (s *NodeController) PopulateAddresses(nodes *api.NodeList) (*api.NodeList,
 	return nodes, nil
 }
 
-// DoChecks performs health checking for given list of nodes.
-func (s *NodeController) DoChecks(nodes *api.NodeList) *api.NodeList {
+// UpdateNodesStatus performs health checking for given list of nodes.
+func (s *NodeController) UpdateNodesStatus(nodes *api.NodeList) *api.NodeList {
 	var wg sync.WaitGroup
 	wg.Add(len(nodes.Items))
 	for i := range nodes.Items {
 		go func(node *api.Node) {
 			node.Status.Conditions = s.DoCheck(node)
+			if err := s.updateNodeInfo(node); err != nil {
+				glog.Errorf("Can't collect information for node %s: %v", node.Name, err)
+			}
 			wg.Done()
 		}(&nodes.Items[i])
 	}
@@ -318,6 +321,17 @@ func (s *NodeController) DoChecks(nodes *api.NodeList) *api.NodeList {
 	return nodes
 }
 
+func (s *NodeController) updateNodeInfo(node *api.Node) error {
+	nodeInfo, err := s.kubeletClient.GetNodeInfo(node.Name)
+	if err != nil {
+		return err
+	}
+	for key, value := range nodeInfo.Capacity {
+		node.Spec.Capacity[key] = value
+	}
+	return nil
+}
+
 // DoCheck performs health checking for given node.
 func (s *NodeController) DoCheck(node *api.Node) []api.NodeCondition {
 	var conditions []api.NodeCondition

pkg/cloudprovider/controller/nodecontroller_test.go

@@ -130,6 +130,10 @@ func (c *FakeKubeletClient) GetPodStatus(host, podNamespace, podID string) (api.
 	return api.PodStatusResult{}, errors.New("Not Implemented")
 }
 
+func (c *FakeKubeletClient) GetNodeInfo(host string) (api.NodeInfo, error) {
+	return api.NodeInfo{}, errors.New("Not Implemented")
+}
+
 func (c *FakeKubeletClient) HealthCheck(host string) (probe.Result, error) {
 	return c.Status, c.Err
 }

pkg/kubelet/server.go

@@ -33,6 +33,7 @@ import (
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/latest"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/resource"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/healthz"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/httplog"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
@@ -46,8 +47,9 @@ import (
 
 // Server is a http.Handler which exposes kubelet functionality over HTTP.
 type Server struct {
-	host HostInterface
-	mux  *http.ServeMux
+	host        HostInterface
+	mux         *http.ServeMux
+	machineInfo *cadvisorApi.MachineInfo
 }
 
 type TLSOptions struct {
@@ -114,6 +116,7 @@ func (s *Server) InstallDefaultHandlers() {
 	healthz.InstallHandler(s.mux)
 	s.mux.HandleFunc("/podInfo", s.handlePodInfoOld)
 	s.mux.HandleFunc("/api/v1beta1/podInfo", s.handlePodInfoVersioned)
+	s.mux.HandleFunc("/api/v1beta1/nodeInfo", s.handleNodeInfoVersioned)
 	s.mux.HandleFunc("/boundPods", s.handleBoundPods)
 	s.mux.HandleFunc("/stats/", s.handleStats)
 	s.mux.HandleFunc("/spec/", s.handleSpec)
@@ -329,9 +332,47 @@ func (s *Server) handleLogs(w http.ResponseWriter, req *http.Request) {
 	s.host.ServeLogs(w, req)
 }
 
+// getCachedMachineInfo assumes that the machine info can't change without a reboot
+func (s *Server) getCachedMachineInfo() (*cadvisorApi.MachineInfo, error) {
+	if s.machineInfo == nil {
+		info, err := s.host.GetMachineInfo()
+		if err != nil {
+			return nil, err
+		}
+		s.machineInfo = info
+	}
+	return s.machineInfo, nil
+}
+
+// handleNodeInfoVersioned handles node info requests against the Kubelet.
+func (s *Server) handleNodeInfoVersioned(w http.ResponseWriter, req *http.Request) {
+	info, err := s.getCachedMachineInfo()
+	if err != nil {
+		s.error(w, err)
+		return
+	}
+	capacity := api.ResourceList{
+		api.ResourceCPU: *resource.NewMilliQuantity(
+			int64(info.NumCores*1000),
+			resource.DecimalSI),
+		api.ResourceMemory: *resource.NewQuantity(
+			info.MemoryCapacity,
+			resource.BinarySI),
+	}
+	data, err := json.Marshal(api.NodeInfo{
+		Capacity: capacity,
+	})
+	if err != nil {
+		s.error(w, err)
+		return
+	}
+	w.Header().Add("Content-type", "application/json")
+	w.Write(data)
+}
+
 // handleSpec handles spec requests against the Kubelet.
 func (s *Server) handleSpec(w http.ResponseWriter, req *http.Request) {
-	info, err := s.host.GetMachineInfo()
+	info, err := s.getCachedMachineInfo()
 	if err != nil {
 		s.error(w, err)
 		return