Change /containers to /state with machine info

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

README.md

@@ -13,7 +13,6 @@ Add a process:
 ```bash
 curl -s -XPUT localhost:8888/containers/redis/process -d@process.json | json_pp                   
 {
-   "pid" : 25671,
    "user" : {
       "gid" : 0,
       "uid" : 0
@@ -31,10 +30,10 @@ curl -s -XPUT localhost:8888/containers/redis/process -d@process.json | json_pp
 ```
 
 
-Get containers: 
+Get containers and state: 
 
 ```bash
-curl -s localhost:8888/containers | json_pp
+curl -s localhost:8888/state | json_pp
 {
    "containers" : [
       {

api/v1/server.go

@@ -30,7 +30,7 @@ func NewServer(supervisor *containerd.Supervisor) http.Handler {
 	// internal method for replaying the journal
 	r.HandleFunc("/event", s.event).Methods("POST")
 	r.HandleFunc("/events", s.events).Methods("GET")
-	r.HandleFunc("/containers", s.containers).Methods("GET")
+	r.HandleFunc("/state", s.state).Methods("GET")
 	return s
 }
 
@@ -100,7 +100,7 @@ func (s *server) event(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	if e.Containers != nil && len(e.Containers) > 0 {
-		if err := writeContainers(w, &e); err != nil {
+		if err := s.writeState(w, &e); err != nil {
 			http.Error(w, err.Error(), http.StatusInternalServerError)
 			return
 		}
@@ -170,22 +170,28 @@ func (s *server) signalPid(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
-func (s *server) containers(w http.ResponseWriter, r *http.Request) {
+func (s *server) state(w http.ResponseWriter, r *http.Request) {
 	e := containerd.NewEvent(containerd.GetContainerEventType)
 	s.supervisor.SendEvent(e)
 	if err := <-e.Err; err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 		return
 	}
-	if err := writeContainers(w, e); err != nil {
+	if err := s.writeState(w, e); err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 		return
 	}
 }
 
-func writeContainers(w http.ResponseWriter, e *containerd.Event) error {
-	var state State
-	state.Containers = []Container{}
+func (s *server) writeState(w http.ResponseWriter, e *containerd.Event) error {
+	m := s.supervisor.Machine()
+	state := State{
+		Containers: []Container{},
+		Machine: Machine{
+			Cpus:   m.Cpus,
+			Memory: m.Memory,
+		},
+	}
 	for _, c := range e.Containers {
 		processes, err := c.Processes()
 		if err != nil {

api/v1/types.go

@@ -2,6 +2,7 @@ package v1
 
 type State struct {
 	Containers []Container `json:"containers"`
+	Machine    Machine     `json:"machine"`
 }
 
 type Status string
@@ -11,6 +12,11 @@ const (
 	Running Status = "running"
 )
 
+type Machine struct {
+	Cpus   int   `json:"cpus"`
+	Memory int64 `json:"memory"`
+}
+
 type ContainerState struct {
 	Status Status `json:"status,omitempty"`
 }

machine.go

@@ -0,0 +1,23 @@
+package containerd
+
+import "github.com/cloudfoundry/gosigar"
+
+type Machine struct {
+	Cpus   int
+	Memory int64
+}
+
+func CollectMachineInformation() (Machine, error) {
+	m := Machine{}
+	cpu := sigar.CpuList{}
+	if err := cpu.Get(); err != nil {
+		return m, err
+	}
+	m.Cpus = len(cpu.List)
+	mem := sigar.Mem{}
+	if err := mem.Get(); err != nil {
+		return m, err
+	}
+	m.Memory = int64(mem.Total)
+	return m, nil
+}

supervisor.go

@@ -24,6 +24,10 @@ func NewSupervisor(stateDir string, tasks chan *StartTask) (*Supervisor, error)
 	if err != nil {
 		return nil, err
 	}
+	machine, err := CollectMachineInformation()
+	if err != nil {
+		return nil, err
+	}
 	s := &Supervisor{
 		stateDir:   stateDir,
 		containers: make(map[string]runtime.Container),
@@ -32,6 +36,7 @@ func NewSupervisor(stateDir string, tasks chan *StartTask) (*Supervisor, error)
 		journal:    j,
 		tasks:      tasks,
 		events:     make(chan *Event, 2048),
+		machine:    machine,
 	}
 	// register default event handlers
 	s.handlers = map[EventType]Handler{
@@ -59,6 +64,7 @@ type Supervisor struct {
 	events      chan *Event
 	tasks       chan *StartTask
 	subscribers map[subscriber]bool
+	machine     Machine
 }
 
 type subscriber chan *Event
@@ -114,6 +120,12 @@ func (s *Supervisor) Start() error {
 	return nil
 }
 
+// Machine returns the machine information for which the
+// supervisor is executing on.
+func (s *Supervisor) Machine() Machine {
+	return s.machine
+}
+
 func (s *Supervisor) getContainerForPid(pid int) (runtime.Container, error) {
 	for _, container := range s.containers {
 		cpid, err := container.Pid()