execution: "restore" container on service creation

Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>

execution/service.go

@@ -2,6 +2,7 @@ package execution
 
 import (
 	"fmt"
+	"os"
 	"syscall"
 	"time"
 
@@ -16,10 +17,47 @@ var (
 	emptyResponse = &google_protobuf.Empty{}
 )
 
-func New(executor Executor) (*Service, error) {
-	return &Service{
+func New(ctx context.Context, executor Executor) (*Service, error) {
+	svc := &Service{
 		executor: executor,
-	}, nil
+	}
+
+	// List existing container, some of them may have died away if
+	// we've been restarted
+	containers, err := executor.List(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	for _, c := range containers {
+		status := c.Status()
+		if status == Stopped || status == Deleted {
+			// generate exit event for all processes, (generate event for init last)
+			processes := c.Processes()
+			processes = append(processes[1:], processes[0])
+			for _, p := range c.Processes() {
+				if p.Status() != Stopped {
+					p.Signal(os.Kill)
+				}
+				sc, err := p.Wait()
+				if err != nil {
+					sc = UnknownStatusCode
+				}
+				topic := GetContainerProcessEventTopic(c.ID(), p.ID())
+				svc.publishEvent(ctx, topic, &ContainerExitEvent{
+					ContainerEvent: ContainerEvent{
+						Timestamp: time.Now(),
+						ID:        c.ID(),
+						Action:    "exit",
+					},
+					PID:        p.ID(),
+					StatusCode: sc,
+				})
+			}
+		}
+	}
+
+	return svc, nil
 }
 
 type Service struct {