Refactor container info in supervisor

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

add_process.go

@@ -9,15 +9,16 @@ type AddProcessEvent struct {
 // TODO: add this to worker for concurrent starts???  maybe not because of races where the container
 // could be stopped and removed...
 func (h *AddProcessEvent) Handle(e *Event) error {
-	container, ok := h.s.containers[e.ID]
+	ci, ok := h.s.containers[e.ID]
 	if !ok {
 		return ErrContainerNotFound
 	}
-	p, io, err := h.s.runtime.StartProcess(container, *e.Process)
+	p, io, err := h.s.runtime.StartProcess(ci.container, *e.Process)
 	if err != nil {
 		return err
 	}
-	if err := h.s.log(container.Path(), io); err != nil {
+	l, err := h.s.log(ci.container.Path(), io)
+	if err != nil {
 		// log the error but continue with the other commands
 		logrus.WithFields(logrus.Fields{
 			"error": err,
@@ -27,6 +28,9 @@ func (h *AddProcessEvent) Handle(e *Event) error {
 	if e.Pid, err = p.Pid(); err != nil {
 		return err
 	}
-	h.s.processes[e.Pid] = container
+	h.s.processes[e.Pid] = &containerInfo{
+		container: ci.container,
+		logger:    l,
+	}
 	return nil
 }

checkpoint.go

@@ -5,11 +5,11 @@ type CreateCheckpointEvent struct {
 }
 
 func (h *CreateCheckpointEvent) Handle(e *Event) error {
-	container, ok := h.s.containers[e.ID]
+	i, ok := h.s.containers[e.ID]
 	if !ok {
 		return ErrContainerNotFound
 	}
-	return container.Checkpoint(*e.Checkpoint)
+	return i.container.Checkpoint(*e.Checkpoint)
 }
 
 type DeleteCheckpointEvent struct {
@@ -17,9 +17,9 @@ type DeleteCheckpointEvent struct {
 }
 
 func (h *DeleteCheckpointEvent) Handle(e *Event) error {
-	container, ok := h.s.containers[e.ID]
+	i, ok := h.s.containers[e.ID]
 	if !ok {
 		return ErrContainerNotFound
 	}
-	return container.DeleteCheckpoint(e.Checkpoint.Name)
+	return i.container.DeleteCheckpoint(e.Checkpoint.Name)
 }

delete.go

@@ -10,10 +10,13 @@ type DeleteEvent struct {
 }
 
 func (h *DeleteEvent) Handle(e *Event) error {
-	if container, ok := h.s.containers[e.ID]; ok {
-		if err := h.deleteContainer(container); err != nil {
+	if i, ok := h.s.containers[e.ID]; ok {
+		if err := h.deleteContainer(i.container); err != nil {
 			logrus.WithField("error", err).Error("containerd: deleting container")
 		}
+		if err := i.logger.Close(); err != nil {
+			logrus.WithField("error", err).Error("containerd: close container logger")
+		}
 		h.s.notifySubscribers(&Event{
 			Type:   ExitEventType,
 			ID:     e.ID,

exit.go

@@ -10,9 +10,9 @@ func (h *ExitEvent) Handle(e *Event) error {
 	logrus.WithFields(logrus.Fields{"pid": e.Pid, "status": e.Status}).
 		Debug("containerd: process exited")
 	// is it the child process of a container
-	if container, ok := h.s.processes[e.Pid]; ok {
+	if info, ok := h.s.processes[e.Pid]; ok {
 		ne := NewEvent(ExecExitEventType)
-		ne.ID = container.ID()
+		ne.ID = info.container.ID()
 		ne.Pid = e.Pid
 		ne.Status = e.Status
 		h.s.SendEvent(ne)
@@ -42,10 +42,13 @@ type ExecExitEvent struct {
 
 func (h *ExecExitEvent) Handle(e *Event) error {
 	// exec process: we remove this process without notifying the main event loop
-	container := h.s.processes[e.Pid]
-	if err := container.RemoveProcess(e.Pid); err != nil {
+	info := h.s.processes[e.Pid]
+	if err := info.container.RemoveProcess(e.Pid); err != nil {
 		logrus.WithField("error", err).Error("containerd: find container for pid")
 	}
+	if err := info.logger.Close(); err != nil {
+		logrus.WithField("error", err).Error("containerd: close process IO")
+	}
 	delete(h.s.processes, e.Pid)
 	h.s.notifySubscribers(e)
 	return nil

get_containers.go

@@ -5,8 +5,8 @@ type GetContainersEvent struct {
 }
 
 func (h *GetContainersEvent) Handle(e *Event) error {
-	for _, c := range h.s.containers {
-		e.Containers = append(e.Containers, c)
+	for _, i := range h.s.containers {
+		e.Containers = append(e.Containers, i.container)
 	}
 	return nil
 }

log.go

@@ -24,6 +24,15 @@ func newLogger(i *logConfig) (*logger, error) {
 		config:   i,
 		messages: make(chan *Message, DefaultBufferSize),
 	}
+	f, err := os.OpenFile(
+		filepath.Join(l.config.BundlePath, "logs.json"),
+		os.O_CREATE|os.O_WRONLY|os.O_APPEND,
+		0655,
+	)
+	if err != nil {
+		return nil, err
+	}
+	l.f = f
 	hout := &logHandler{
 		stream:   "stdout",
 		messages: l.messages,
@@ -32,16 +41,14 @@ func newLogger(i *logConfig) (*logger, error) {
 		stream:   "stderr",
 		messages: l.messages,
 	}
-	l.wg.Add(2)
 	go func() {
-		defer l.wg.Done()
 		io.Copy(hout, i.Stdout)
 	}()
 	go func() {
-		defer l.wg.Done()
 		io.Copy(herr, i.Stderr)
 	}()
-	return l, l.start()
+	l.start()
+	return l, nil
 }
 
 type Message struct {
@@ -71,27 +78,17 @@ func (h *logHandler) Write(b []byte) (int, error) {
 	return len(b), nil
 }
 
-func (l *logger) start() error {
-	f, err := os.OpenFile(
-		filepath.Join(l.config.BundlePath, "logs.json"),
-		os.O_CREATE|os.O_WRONLY|os.O_APPEND,
-		0655,
-	)
-	if err != nil {
-		return err
-	}
-	l.f = f
+func (l *logger) start() {
 	l.wg.Add(1)
 	go func() {
 		l.wg.Done()
-		enc := json.NewEncoder(f)
+		enc := json.NewEncoder(l.f)
 		for m := range l.messages {
 			if err := enc.Encode(m); err != nil {
 				logrus.WithField("error", err).Error("write log message")
 			}
 		}
 	}()
-	return nil
 }
 
 func (l *logger) Close() (err error) {

signal.go

@@ -5,11 +5,11 @@ type SignalEvent struct {
 }
 
 func (h *SignalEvent) Handle(e *Event) error {
-	container, ok := h.s.containers[e.ID]
+	i, ok := h.s.containers[e.ID]
 	if !ok {
 		return ErrContainerNotFound
 	}
-	processes, err := container.Processes()
+	processes, err := i.container.Processes()
 	if err != nil {
 		return err
 	}

start.go

@@ -10,7 +10,9 @@ func (h *StartEvent) Handle(e *Event) error {
 		return err
 	}
 	h.s.containerGroup.Add(1)
-	h.s.containers[e.ID] = container
+	h.s.containers[e.ID] = &containerInfo{
+		container: container,
+	}
 	ContainersCounter.Inc(1)
 	task := &StartTask{
 		Err:       e.Err,

supervisor.go

@@ -29,8 +29,8 @@ func NewSupervisor(id, stateDir string, tasks chan *StartTask) (*Supervisor, err
 	}
 	s := &Supervisor{
 		stateDir:    stateDir,
-		containers:  make(map[string]runtime.Container),
-		processes:   make(map[int]runtime.Container),
+		containers:  make(map[string]*containerInfo),
+		processes:   make(map[int]*containerInfo),
 		runtime:     r,
 		tasks:       tasks,
 		events:      make(chan *Event, DefaultBufferSize),
@@ -54,11 +54,16 @@ func NewSupervisor(id, stateDir string, tasks chan *StartTask) (*Supervisor, err
 	return s, nil
 }
 
+type containerInfo struct {
+	container runtime.Container
+	logger    *logger
+}
+
 type Supervisor struct {
 	// stateDir is the directory on the system to store container runtime state information.
 	stateDir   string
-	containers map[string]runtime.Container
-	processes  map[int]runtime.Container
+	containers map[string]*containerInfo
+	processes  map[int]*containerInfo
 	handlers   map[EventType]Handler
 	runtime    runtime.Runtime
 	events     chan *Event
@@ -78,7 +83,8 @@ func (s *Supervisor) Stop(sig chan os.Signal) {
 	// Close the tasks channel so that no new containers get started
 	close(s.tasks)
 	// send a SIGTERM to all containers
-	for id, c := range s.containers {
+	for id, i := range s.containers {
+		c := i.container
 		logrus.WithField("id", id).Debug("sending TERM to container processes")
 		procs, err := c.Processes()
 		if err != nil {
@@ -193,7 +199,8 @@ func (s *Supervisor) Machine() Machine {
 // getContainerForPid returns the container where the provided pid is the pid1 or main
 // process in the container
 func (s *Supervisor) getContainerForPid(pid int) (runtime.Container, error) {
-	for _, container := range s.containers {
+	for _, i := range s.containers {
+		container := i.container
 		cpid, err := container.Pid()
 		if err != nil {
 			if lerr, ok := err.(libcontainer.Error); ok {
@@ -215,16 +222,16 @@ func (s *Supervisor) SendEvent(evt *Event) {
 	s.events <- evt
 }
 
-func (s *Supervisor) log(path string, i *runtime.IO) error {
+func (s *Supervisor) log(path string, i *runtime.IO) (*logger, error) {
 	config := &logConfig{
 		BundlePath: path,
 		Stdin:      i.Stdin,
 		Stdout:     i.Stdout,
 		Stderr:     i.Stderr,
 	}
-	// TODO: save logger to call close after its all done
-	if _, err := newLogger(config); err != nil {
-		return err
+	l, err := newLogger(config)
+	if err != nil {
+		return nil, err
 	}
-	return nil
+	return l, nil
 }

update.go

@@ -7,10 +7,11 @@ type UpdateEvent struct {
 }
 
 func (h *UpdateEvent) Handle(e *Event) error {
-	container, ok := h.s.containers[e.ID]
+	i, ok := h.s.containers[e.ID]
 	if !ok {
 		return ErrContainerNotFound
 	}
+	container := i.container
 	if e.State.Status != "" {
 		switch e.State.Status {
 		case runtime.Running:

worker.go

@@ -35,13 +35,15 @@ func (w *worker) Start() {
 	for t := range w.s.tasks {
 		started := time.Now()
 		// start logging the container's stdio
-		if err := w.s.log(t.Container.Path(), t.IO); err != nil {
+		l, err := w.s.log(t.Container.Path(), t.IO)
+		if err != nil {
 			evt := NewEvent(DeleteEventType)
 			evt.ID = t.Container.ID()
 			w.s.SendEvent(evt)
 			t.Err <- err
 			continue
 		}
+		w.s.containers[t.Container.ID()].logger = l
 		if t.Checkpoint != "" {
 			if err := t.Container.Restore(t.Checkpoint); err != nil {
 				evt := NewEvent(DeleteEventType)