Move image event publishing to metadata store

The metadata store is in the best place to handle events directly after
the database has been updated. This prevents every user of the image
store interface from having to know whether or not they are responsible
for publishing events and avoid double events if the grpc local service
is used.

Signed-off-by: Derek McGowan <derek@mcg.dev>

core/metadata/images.go

@@ -25,6 +25,7 @@ import (
 	"sync/atomic"
 	"time"
 
+	eventstypes "github.com/containerd/containerd/v2/api/events"
 	"github.com/containerd/containerd/v2/core/images"
 	"github.com/containerd/containerd/v2/core/metadata/boltutil"
 	"github.com/containerd/containerd/v2/pkg/epoch"
@@ -164,6 +165,15 @@ func (s *imageStore) Create(ctx context.Context, image images.Image) (images.Ima
 		return images.Image{}, err
 	}
 
+	if s.db.dbopts.publisher != nil {
+		if err := s.db.dbopts.publisher.Publish(ctx, "/images/create", &eventstypes.ImageCreate{
+			Name:   image.Name,
+			Labels: image.Labels,
+		}); err != nil {
+			return images.Image{}, err
+		}
+	}
+
 	return image, nil
 }
 
@@ -256,6 +266,15 @@ func (s *imageStore) Update(ctx context.Context, image images.Image, fieldpaths
 		return images.Image{}, err
 	}
 
+	if s.db.dbopts.publisher != nil {
+		if err := s.db.dbopts.publisher.Publish(ctx, "/images/update", &eventstypes.ImageUpdate{
+			Name:   updated.Name,
+			Labels: updated.Labels,
+		}); err != nil {
+			return images.Image{}, err
+		}
+	}
+
 	return updated, nil
 
 }
@@ -273,7 +292,7 @@ func (s *imageStore) Delete(ctx context.Context, name string, opts ...images.Del
 		}
 	}
 
-	return update(ctx, s.db, func(tx *bolt.Tx) error {
+	err = update(ctx, s.db, func(tx *bolt.Tx) error {
 		bkt := getImagesBucket(tx, namespace)
 		if bkt == nil {
 			return fmt.Errorf("image %q: %w", name, errdefs.ErrNotFound)
@@ -310,6 +329,19 @@ func (s *imageStore) Delete(ctx context.Context, name string, opts ...images.Del
 
 		return nil
 	})
+	if err != nil {
+		return err
+	}
+
+	if s.db.dbopts.publisher != nil {
+		if err := s.db.dbopts.publisher.Publish(ctx, "/images/delete", &eventstypes.ImageDelete{
+			Name: name,
+		}); err != nil {
+			return err
+		}
+	}
+
+	return nil
 }
 
 func validateImage(image *images.Image) error {