refactor(search): move the opensearch facet bridge to mapping.ToProto

convert.copyFacet rebuilt every facet by hand on the way into the index; mapping.ToProto is the generic counterpart of the FromProto the graph endpoint uses, so both directions share one bridge.

services/search/pkg/mapping/proto.go

@@ -35,3 +35,17 @@ func setValueLenient(v reflect.Value, raw any) error {
 	}
 	return err
 }
+
+// ToProto builds a *M (a proto facet message) from the equally shaped
+// libregraph facet. protojson accepts plain-JSON numbers for int64, so the
+// JSON bridge is enough in this direction.
+func ToProto[M any, T any](v *T) *M {
+	if v == nil {
+		return nil
+	}
+	out, err := conversions.To[*M](v)
+	if err != nil {
+		return nil
+	}
+	return out
+}

services/search/pkg/mapping/proto_test.go

@@ -42,6 +42,15 @@ var _ = Describe("FromProto", func() {
 		Expect(out.GetTakenDateTime()).To(Equal(mustTime("2023-07-21T10:11:12Z")))
 	})
 
+	It("round-trips through ToProto", func() {
+		lg := &libregraph.Audio{Artist: conversions.ToPointer("Motörhead"), Bitrate: conversions.ToPointer(int64(256))}
+		pb := ToProto[searchmsg.Audio](lg)
+		Expect(pb).ToNot(BeNil())
+		Expect(pb.GetArtist()).To(Equal("Motörhead"))
+		Expect(pb.GetBitrate()).To(Equal(int64(256)))
+		Expect(FromProto[libregraph.Audio](pb)).To(Equal(lg))
+	})
+
 	It("returns nil for nil input and for an empty message", func() {
 		Expect(FromProto[libregraph.Audio]((*searchmsg.Audio)(nil))).To(BeNil())
 		Expect(FromProto[libregraph.Audio](&searchmsg.Audio{})).To(BeNil())

services/search/pkg/opensearch/internal/convert/opensearch.go

@@ -11,20 +11,10 @@ import (
 
 	"github.com/opencloud-eu/opencloud/pkg/conversions"
 	searchMessage "github.com/opencloud-eu/opencloud/protogen/gen/opencloud/messages/search/v0"
+	"github.com/opencloud-eu/opencloud/services/search/pkg/mapping"
 	"github.com/opencloud-eu/opencloud/services/search/pkg/search"
 )
 
-// copyFacet converts a typed pointer from the indexed shape (libregraph) to
-// the protobuf shape via conversions.To. Returns nil when src is nil so the
-// enclosing Match.Entity field stays nil.
-func copyFacet[Dst, Src any](src *Src) *Dst {
-	if src == nil {
-		return nil
-	}
-	dst, _ := conversions.To[*Dst](src)
-	return dst
-}
-
 func OpenSearchHitToMatch(hit opensearchgoAPI.SearchHit) (*searchMessage.Match, error) {
 	resource, err := conversions.To[search.Resource](hit.Source)
 	if err != nil {
@@ -79,13 +69,13 @@ func OpenSearchHitToMatch(hit opensearchgoAPI.SearchHit) (*searchMessage.Match,
 
 				return strings.Join(contentHighlights[:], "; ")
 			}(),
-			Audio:       copyFacet[searchMessage.Audio](resource.Audio),
-			Image:       copyFacet[searchMessage.Image](resource.Image),
-			Location:    copyFacet[searchMessage.GeoCoordinates](resource.Location),
-			Photo:       copyFacet[searchMessage.Photo](resource.Photo),
-			Video:       copyFacet[searchMessage.Video](resource.Video),
-			MotionPhoto: copyFacet[searchMessage.MotionPhoto](resource.MotionPhoto),
-			LivePhoto:   copyFacet[searchMessage.LivePhoto](resource.LivePhoto),
+			Audio:       mapping.ToProto[searchMessage.Audio](resource.Audio),
+			Image:       mapping.ToProto[searchMessage.Image](resource.Image),
+			Location:    mapping.ToProto[searchMessage.GeoCoordinates](resource.Location),
+			Photo:       mapping.ToProto[searchMessage.Photo](resource.Photo),
+			Video:       mapping.ToProto[searchMessage.Video](resource.Video),
+			MotionPhoto: mapping.ToProto[searchMessage.MotionPhoto](resource.MotionPhoto),
+			LivePhoto:   mapping.ToProto[searchMessage.LivePhoto](resource.LivePhoto),
 		},
 	}