Add oom notifications and pid to create response

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

api/grpc/server/server.go

@@ -37,6 +37,7 @@ func (s *apiServer) CreateContainer(ctx context.Context, c *types.CreateContaine
 	e.Stderr = c.Stderr
 	e.Stdin = c.Stdin
 	e.Console = c.Console
+	e.StartResponse = make(chan containerd.StartResponse, 1)
 	if c.Checkpoint != "" {
 		e.Checkpoint = &runtime.Checkpoint{
 			Name: c.Checkpoint,
@@ -46,7 +47,10 @@ func (s *apiServer) CreateContainer(ctx context.Context, c *types.CreateContaine
 	if err := <-e.Err; err != nil {
 		return nil, err
 	}
-	return &types.CreateContainerResponse{}, nil
+	sr := <-e.StartResponse
+	return &types.CreateContainerResponse{
+		Pid: uint32(sr.Pid),
+	}, nil
 }
 
 func (s *apiServer) Signal(ctx context.Context, r *types.SignalRequest) (*types.SignalResponse, error) {
@@ -223,18 +227,27 @@ func (s *apiServer) Events(r *types.EventsRequest, stream types.API_EventsServer
 	events := s.sv.Events()
 	defer s.sv.Unsubscribe(events)
 	for evt := range events {
+		var ev *types.Event
 		switch evt.Type {
 		case containerd.ExitEventType, containerd.ExecExitEventType:
-			ev := &types.Event{
+			ev = &types.Event{
 				Type:   "exit",
 				Id:     evt.ID,
 				Pid:    uint32(evt.Pid),
 				Status: uint32(evt.Status),
 			}
+		case containerd.OOMEventType:
+			ev = &types.Event{
+				Type: "oom",
+				Id:   evt.ID,
+			}
+		}
+		if ev != nil {
 			if err := stream.Send(ev); err != nil {
 				return err
 			}
 		}
+
 	}
 	return nil
 }

api/grpc/types/api.pb.go

@@ -78,6 +78,7 @@ func (*CreateContainerRequest) ProtoMessage()               {}
 func (*CreateContainerRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{0} }
 
 type CreateContainerResponse struct {
+	Pid uint32 `protobuf:"varint,1,opt,name=pid" json:"pid,omitempty"`
 }
 
 func (m *CreateContainerResponse) Reset()                    { *m = CreateContainerResponse{} }
@@ -1086,96 +1087,96 @@ var _API_serviceDesc = grpc.ServiceDesc{
 }
 
 var fileDescriptor0 = []byte{
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+	0xb3, 0xb5, 0x52, 0xe9, 0x7d, 0xd8, 0x44, 0xa5, 0x8a, 0x9d, 0xf6, 0x55, 0x2a, 0x09, 0x71, 0x18,
-	0x9d, 0x55, 0x2a, 0xd6, 0x63, 0xe8, 0x3f, 0x4f, 0xa7, 0x84, 0x79, 0x27, 0xba, 0xfa, 0xff, 0x6b,
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-	0x03, 0xfd, 0x52, 0x87, 0xde, 0xc1, 0x34, 0x0e, 0xd3, 0xa8, 0xd4, 0xe5, 0xb2, 0x86, 0xe7, 0xba,
+	0xae, 0xfe, 0x7f, 0xdb, 0x40, 0x3f, 0xd7, 0xa1, 0x77, 0x30, 0x8d, 0xc3, 0x34, 0x2a, 0x75, 0xb9,
-	0x5c, 0xca, 0xdc, 0x85, 0xbe, 0xfc, 0x80, 0x2a, 0x31, 0xd9, 0x5c, 0xe6, 0x7c, 0xa9, 0xf3, 0x4b,
+	0xac, 0xe1, 0xb9, 0x2e, 0x97, 0x32, 0xf7, 0xa0, 0x2f, 0x3f, 0xa0, 0x4a, 0x4c, 0x36, 0x97, 0x39,
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-	0x24, 0x65, 0x2a, 0xef, 0x64, 0x96, 0x73, 0x07, 0xf7, 0x8a, 0x01, 0xcb, 0x26, 0x7a, 0x0e, 0x9b,
+	0x38, 0x95, 0x81, 0x28, 0x49, 0x99, 0xca, 0x3b, 0x99, 0xe5, 0xdc, 0xc1, 0xbd, 0x62, 0xc0, 0xb2,
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+	0x51, 0x4b, 0x34, 0x58, 0x04, 0x4d, 0xe9, 0xcf, 0x7b, 0x30, 0x08, 0xe4, 0x47, 0x47, 0x33, 0xd1,
-	0x20, 0x21, 0x1b, 0x8e, 0xf0, 0x6f, 0x21, 0x1b, 0x45, 0x6e, 0x31, 0x1f, 0xbc, 0x22, 0x50, 0xcc,
+	0x28, 0x28, 0x96, 0x3e, 0x48, 0xc8, 0x86, 0x23, 0xfc, 0x5b, 0xc8, 0x46, 0x91, 0x5b, 0xcc, 0x07,
-	0x8f, 0x14, 0xfd, 0x63, 0x79, 0x7b, 0x5b, 0xf4, 0x90, 0xd8, 0xff, 0xb3, 0x09, 0x8d, 0xc7, 0x87,
+	0xaf, 0x08, 0x14, 0xf3, 0x23, 0x45, 0xff, 0x58, 0xde, 0xde, 0x16, 0x3d, 0x24, 0xf6, 0xff, 0x68,
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+	0x62, 0x73, 0xaf, 0xac, 0xf1, 0xee, 0x82, 0x13, 0x0d, 0x72, 0x0c, 0x1b, 0xd5, 0x67, 0x83, 0x59,
-	0x7f, 0x7c, 0x73, 0xe9, 0x79, 0x11, 0xb6, 0xfa, 0x78, 0xd0, 0xb0, 0x4b, 0x9e, 0x22, 0x1a, 0x76,
+	0xe1, 0xa1, 0x7a, 0xc9, 0x1f, 0xdf, 0x5c, 0x7a, 0x5e, 0x84, 0xad, 0x3e, 0x1e, 0x34, 0xec, 0x92,
-	0xe9, 0xab, 0x63, 0xcd, 0xfc, 0x16, 0x86, 0xe5, 0x7b, 0xbf, 0xf9, 0xa6, 0x52, 0x5a, 0xf8, 0x1c,
+	0xa7, 0x88, 0x86, 0x5d, 0xfa, 0xea, 0x58, 0x33, 0xbf, 0x81, 0x61, 0xf9, 0xde, 0x6f, 0xfe, 0x5f,
-	0x19, 0xdf, 0x58, 0x72, 0xaa, 0x01, 0x3f, 0x94, 0xa5, 0x8b, 0x77, 0x8d, 0x8c, 0xe5, 0xc2, 0xa3,
+	0x29, 0x2d, 0x7c, 0x8e, 0x8c, 0x6f, 0x2c, 0x39, 0xd5, 0x80, 0x1f, 0xc8, 0xd2, 0xc5, 0xbb, 0x46,
-	0x60, 0x7c, 0xad, 0xbc, 0xa9, 0xb5, 0xee, 0x43, 0x4b, 0xde, 0x20, 0x75, 0xca, 0x4a, 0x17, 0xca,
+	0xc6, 0x72, 0xe1, 0x51, 0x30, 0xbe, 0x56, 0xde, 0xd4, 0x5a, 0x0f, 0xa0, 0x25, 0x6f, 0x90, 0x3a,
-	0x71, 0xbf, 0xb8, 0x6b, 0xad, 0xdd, 0xaf, 0xe1, 0x94, 0xea, 0x3c, 0x23, 0x4c, 0xd6, 0x73, 0xd1,
+	0x65, 0xa5, 0x0b, 0xe5, 0xb8, 0x5f, 0xdc, 0xb5, 0xd6, 0x1e, 0xd4, 0x70, 0x4a, 0x75, 0x9e, 0x13,
-	0xd4, 0x9c, 0x8a, 0xd8, 0xe4, 0x2a, 0x27, 0x2d, 0xf1, 0xb7, 0xc1, 0x83, 0x7f, 0x02, 0x00, 0x00,
+	0x26, 0xeb, 0xb9, 0x68, 0x6a, 0x4e, 0x45, 0x6c, 0x72, 0x95, 0x93, 0x96, 0xf8, 0x0f, 0xe1, 0xe1,
-	0xff, 0xff, 0x8b, 0xba, 0x29, 0x23, 0x43, 0x10, 0x00, 0x00,
+	0xdf, 0x01, 0x00, 0x00, 0xff, 0xff, 0xa6, 0xf1, 0xd0, 0x3c, 0x50, 0x10, 0x00, 0x00,
 }

api/grpc/types/api.proto

@@ -26,6 +26,7 @@ message CreateContainerRequest {
 }
 
 message CreateContainerResponse {
+    uint32 pid = 1; // PID of the containers main process
 }
 
 message SignalRequest {

containerd/main.go

@@ -62,6 +62,10 @@ var daemonFlags = []cli.Flag{
 		Value: "/run/containerd/containerd.sock",
 		Usage: "Address on which GRPC API will listen",
 	},
+	cli.BoolFlag{
+		Name:  "oom-notify",
+		Usage: "enable oom notifications for containers",
+	},
 }
 
 func main() {
@@ -89,6 +93,7 @@ func main() {
 			context.String("listen"),
 			context.String("state-dir"),
 			context.Int("concurrency"),
+			context.Bool("oom-notify"),
 		); err != nil {
 			logrus.Fatal(err)
 		}
@@ -146,9 +151,9 @@ func processMetrics() {
 	}()
 }
 
-func daemon(id, address, stateDir string, concurrency int) error {
+func daemon(id, address, stateDir string, concurrency int, oom bool) error {
 	tasks := make(chan *containerd.StartTask, concurrency*100)
-	supervisor, err := containerd.NewSupervisor(id, stateDir, tasks)
+	supervisor, err := containerd.NewSupervisor(id, stateDir, tasks, oom)
 	if err != nil {
 		return err
 	}

create.go

@@ -21,6 +21,7 @@ func (h *StartEvent) Handle(e *Event) error {
 		Stdin:         e.Stdin,
 		Stdout:        e.Stdout,
 		Stderr:        e.Stderr,
+		StartResponse: e.StartResponse,
 	}
 	if e.Checkpoint != nil {
 		task.Checkpoint = e.Checkpoint.Name

ctr/container.go

@@ -121,7 +121,8 @@ var StartCommand = cli.Command{
 				}
 			}
 		}
-		if _, err := c.CreateContainer(netcontext.Background(), r); err != nil {
+		resp, err := c.CreateContainer(netcontext.Background(), r)
+		if err != nil {
 			fatal(err.Error(), 1)
 		}
 		if context.Bool("attach") {
@@ -140,6 +141,8 @@ var StartCommand = cli.Command{
 					os.Exit(int(e.Status))
 				}
 			}
+		} else {
+			fmt.Println(resp.Pid)
 		}
 	},
 }

event.go

@@ -23,6 +23,7 @@ const (
 	DeleteCheckpointEventType EventType = "deleteCheckpoint"
 	StatsEventType            EventType = "events"
 	UnsubscribeStatsEventType EventType = "unsubscribeEvents"
+	OOMEventType              EventType = "oom"
 )
 
 func NewEvent(t EventType) *Event {
@@ -33,6 +34,10 @@ func NewEvent(t EventType) *Event {
 	}
 }
 
+type StartResponse struct {
+	Pid int
+}
+
 type Event struct {
 	Type          EventType
 	Timestamp     time.Time
@@ -50,6 +55,7 @@ type Event struct {
 	Containers    []runtime.Container
 	Checkpoint    *runtime.Checkpoint
 	Err           chan error
+	StartResponse chan StartResponse
 	Stats         chan interface{}
 }
 

linux/linux.go

@@ -363,6 +363,10 @@ func (c *libcontainerContainer) RemoveProcess(pid int) error {
 	return err
 }
 
+func (c *libcontainerContainer) OOM() (<-chan struct{}, error) {
+	return c.c.NotifyOOM()
+}
+
 func NewRuntime(stateDir string) (runtime.Runtime, error) {
 	f, err := libcontainer.New(stateDir, libcontainer.Cgroupfs, func(l *libcontainer.LinuxFactory) error {
 		//l.CriuPath = context.GlobalString("criu")

oom.go

@@ -0,0 +1,80 @@
+package containerd
+
+import (
+	"reflect"
+	"sync"
+)
+
+func newNotifier(s *Supervisor) *notifier {
+	n := &notifier{
+		s:          s,
+		channels:   make(map[<-chan struct{}]string),
+		controller: make(chan struct{}),
+	}
+	go n.start()
+	return n
+}
+
+type notifier struct {
+	m          sync.Mutex
+	channels   map[<-chan struct{}]string
+	controller chan struct{}
+	s          *Supervisor
+}
+
+func (n *notifier) start() {
+	for {
+		c := n.createCase()
+		i, _, ok := reflect.Select(c)
+		if i == 0 {
+			continue
+		}
+		if ok {
+			ch := c[i].Chan.Interface().(<-chan struct{})
+			id := n.channels[ch]
+			e := NewEvent(OOMEventType)
+			e.ID = id
+			n.s.SendEvent(e)
+			continue
+		}
+		// the channel was closed and we should remove it
+		ch := c[i].Chan.Interface().(<-chan struct{})
+		n.removeChan(ch)
+	}
+}
+
+func (n *notifier) Add(ch <-chan struct{}, id string) {
+	n.m.Lock()
+	n.channels[ch] = id
+	n.m.Unlock()
+	// signal the main loop to break and add the new
+	// channels
+	n.controller <- struct{}{}
+}
+
+func (n *notifier) createCase() []reflect.SelectCase {
+	var out []reflect.SelectCase
+	// add controller chan so that we can signal when we need to make
+	// changes in the select.  The controller chan will always be at
+	// index 0 in the slice
+	out = append(out, reflect.SelectCase{
+		Dir:  reflect.SelectRecv,
+		Chan: reflect.ValueOf(n.controller),
+	})
+	n.m.Lock()
+	for ch := range n.channels {
+		v := reflect.ValueOf(ch)
+		out = append(out, reflect.SelectCase{
+			Dir:  reflect.SelectRecv,
+			Chan: v,
+		})
+	}
+	n.m.Unlock()
+	return out
+}
+
+func (n *notifier) removeChan(ch <-chan struct{}) {
+	n.m.Lock()
+	delete(n.channels, ch)
+	n.m.Unlock()
+}

runc/runc.go

@@ -111,6 +111,10 @@ func (c *runcContainer) Checkpoints() ([]runtime.Checkpoint, error) {
 	return nil, errors.New("not implemented")
 }
 
+func (c *runcContainer) OOM() (<-chan struct{}, error) {
+	return nil, errors.New("not implemented")
+}
+
 func (c *runcContainer) newCommand(args ...string) *exec.Cmd {
 	cmd := exec.Command("runc", append([]string{"--root", c.stateDir, "--id", c.id}, args...)...)
 	cmd.Dir = c.path

runtime/container.go

@@ -111,4 +111,6 @@ type Container interface {
 	Restore(name string) error
 	// Stats returns realtime container stats and resource information
 	Stats() (*Stat, error)
+	// OOM signals the channel if the container received an OOM notification
+	OOM() (<-chan struct{}, error)
 }

supervisor.go

@@ -17,7 +17,7 @@ import (
 const statsInterval = 1 * time.Second
 
 // NewSupervisor returns an initialized Process supervisor.
-func NewSupervisor(id, stateDir string, tasks chan *StartTask) (*Supervisor, error) {
+func NewSupervisor(id, stateDir string, tasks chan *StartTask, oom bool) (*Supervisor, error) {
 	if err := os.MkdirAll(stateDir, 0755); err != nil {
 		return nil, err
 	}
@@ -41,6 +41,9 @@ func NewSupervisor(id, stateDir string, tasks chan *StartTask) (*Supervisor, err
 		subscribers:    make(map[chan *Event]struct{}),
 		statsCollector: newStatsCollector(statsInterval),
 	}
+	if oom {
+		s.notifier = newNotifier(s)
+	}
 	// register default event handlers
 	s.handlers = map[EventType]Handler{
 		ExecExitEventType:         &ExecExitEvent{s},
@@ -81,6 +84,7 @@ type Supervisor struct {
 	machine        Machine
 	containerGroup sync.WaitGroup
 	statsCollector *statsCollector
+	notifier       *notifier
 }
 
 // Stop closes all tasks and sends a SIGTERM to each container's pid1 then waits for they to

worker.go

@@ -4,6 +4,7 @@ import (
 	"sync"
 	"time"
 
+	"github.com/Sirupsen/logrus"
 	"github.com/docker/containerd/runtime"
 )
 
@@ -19,6 +20,7 @@ type StartTask struct {
 	Stdout        string
 	Stderr        string
 	Err           chan error
+	StartResponse chan StartResponse
 }
 
 func NewWorker(s *Supervisor, wg *sync.WaitGroup) Worker {
@@ -63,7 +65,22 @@ func (w *worker) Start() {
 				continue
 			}
 		}
+		pid, err := t.Container.Pid()
+		if err != nil {
+			logrus.WithField("error", err).Error("containerd: get container main pid")
+		}
+		if w.s.notifier != nil {
+			n, err := t.Container.OOM()
+			if err != nil {
+				logrus.WithField("error", err).Error("containerd: notify OOM events")
+			} else {
+				w.s.notifier.Add(n, t.Container.ID())
+			}
+		}
 		ContainerStartTimer.UpdateSince(started)
 		t.Err <- nil
+		t.StartResponse <- StartResponse{
+			Pid: pid,
+		}
 	}
 }