Rename Events to task in supervisor

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

supervisor/task.go

@@ -0,0 +1,89 @@
+package supervisor
+
+import (
+	"os"
+	"time"
+
+	"github.com/docker/containerd/runtime"
+	"github.com/opencontainers/specs"
+)
+
+type TaskType string
+
+const (
+	ExecExitTaskType         TaskType = "execExit"
+	ExitTaskType             TaskType = "exit"
+	StartContainerTaskType   TaskType = "startContainer"
+	DeleteTaskType           TaskType = "deleteContainerEvent"
+	GetContainerTaskType     TaskType = "getContainer"
+	SignalTaskType           TaskType = "signal"
+	AddProcessTaskType       TaskType = "addProcess"
+	UpdateContainerTaskType  TaskType = "updateContainer"
+	UpdateProcessTaskType    TaskType = "updateProcess"
+	CreateCheckpointTaskType TaskType = "createCheckpoint"
+	DeleteCheckpointTaskType TaskType = "deleteCheckpoint"
+	StatsTaskType            TaskType = "events"
+	OOMTaskType              TaskType = "oom"
+)
+
+func NewTask(t TaskType) *Task {
+	return &Task{
+		Type:      t,
+		Timestamp: time.Now(),
+		Err:       make(chan error, 1),
+	}
+}
+
+type StartResponse struct {
+	Container runtime.Container
+}
+
+type Task struct {
+	Type          TaskType
+	Timestamp     time.Time
+	ID            string
+	BundlePath    string
+	Stdout        string
+	Stderr        string
+	Stdin         string
+	Console       string
+	Pid           string
+	Status        int
+	Signal        os.Signal
+	Process       runtime.Process
+	State         runtime.State
+	ProcessSpec   *specs.Process
+	Containers    []runtime.Container
+	Checkpoint    *runtime.Checkpoint
+	Err           chan error
+	StartResponse chan StartResponse
+	Stat          chan *runtime.Stat
+	CloseStdin    bool
+	ResizeTty     bool
+	Width         int
+	Height        int
+	Labels        []string
+}
+
+type Handler interface {
+	Handle(*Task) error
+}
+
+type commonTask struct {
+	data *Task
+	sv   *Supervisor
+}
+
+func (e *commonTask) Handle() {
+	h, ok := e.sv.handlers[e.data.Type]
+	if !ok {
+		e.data.Err <- ErrUnknownTask
+		return
+	}
+	err := h.Handle(e.data)
+	if err != errDeferedResponse {
+		e.data.Err <- err
+		close(e.data.Err)
+		return
+	}
+}