[#58] object/search: Refactor RelationSearcher implementation

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/services/object/search/relation.go

@@ -0,0 +1,64 @@
+package searchsvc
+
+import (
+	"context"
+	"io"
+
+	"github.com/nspcc-dev/neofs-api-go/pkg/object"
+	"github.com/nspcc-dev/neofs-node/pkg/services/object/search/query"
+	queryV1 "github.com/nspcc-dev/neofs-node/pkg/services/object/search/query/v1"
+	"github.com/pkg/errors"
+)
+
+type RelationSearcher struct {
+	svc *Service
+
+	queryGenerator func(*object.Address) query.Query
+}
+
+func (s *RelationSearcher) SearchRelation(ctx context.Context, addr *object.Address) (*object.ID, error) {
+	streamer, err := s.svc.Search(ctx, new(Prm).
+		WithContainerID(addr.GetContainerID()).
+		WithSearchQuery(s.queryGenerator(addr)),
+	)
+	if err != nil {
+		return nil, errors.Wrapf(err, "(%T) could not create search streamer", s)
+	}
+
+	res, err := readFullStream(streamer, 1)
+	if err != nil {
+		return nil, errors.Wrapf(err, "(%T) could not read full search stream", s)
+	} else if ln := len(res); ln != 1 {
+		return nil, errors.Errorf("(%T) unexpected amount of found objects %d", s, ln)
+	}
+
+	return res[0], nil
+}
+
+func readFullStream(s *Streamer, cap int) ([]*object.ID, error) {
+	res := make([]*object.ID, 0, cap)
+
+	for {
+		r, err := s.Recv()
+		if err != nil {
+			if errors.Is(errors.Cause(err), io.EOF) {
+				break
+			}
+
+			return nil, errors.Wrapf(err, "(%s) could not receive search result", "readFullStream")
+		}
+
+		res = append(res, r.IDList()...)
+	}
+
+	return res, nil
+}
+
+func NewRightChildSearcher(svc *Service) *RelationSearcher {
+	return &RelationSearcher{
+		svc: svc,
+		queryGenerator: func(addr *object.Address) query.Query {
+			return queryV1.NewRightChildQuery(addr.GetObjectID())
+		},
+	}
+}

pkg/services/object/search/service.go

@@ -2,7 +2,6 @@ package searchsvc
 
 import (
 	"context"
-	"io"
 	"sync"
 
 	"github.com/nspcc-dev/neofs-api-go/pkg/object"
@@ -10,10 +9,8 @@ import (
 	"github.com/nspcc-dev/neofs-node/pkg/core/netmap"
 	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/localstore"
 	"github.com/nspcc-dev/neofs-node/pkg/network"
-	"github.com/nspcc-dev/neofs-node/pkg/services/object/search/query/v1"
 	objutil "github.com/nspcc-dev/neofs-node/pkg/services/object/util"
 	"github.com/nspcc-dev/neofs-node/pkg/util"
-	"github.com/pkg/errors"
 )
 
 type Service struct {
@@ -64,46 +61,6 @@ func (p *Service) Search(ctx context.Context, prm *Prm) (*Streamer, error) {
 	}, nil
 }
 
-func (p *Service) SearchRightChild(ctx context.Context, addr *object.Address) (*object.ID, error) {
-	streamer, err := p.Search(ctx, new(Prm).
-		WithContainerID(addr.GetContainerID()).
-		WithSearchQuery(
-			query.NewRightChildQuery(addr.GetObjectID()),
-		),
-	)
-	if err != nil {
-		return nil, errors.Wrapf(err, "(%T) could not create search streamer", p)
-	}
-
-	res, err := readFullStream(streamer, 1)
-	if err != nil {
-		return nil, errors.Wrapf(err, "(%T) could not read full search stream", p)
-	} else if ln := len(res); ln != 1 {
-		return nil, errors.Errorf("(%T) unexpected amount of found objects %d", p, ln)
-	}
-
-	return res[0], nil
-}
-
-func readFullStream(s *Streamer, cap int) ([]*object.ID, error) {
-	res := make([]*object.ID, 0, cap)
-
-	for {
-		r, err := s.Recv()
-		if err != nil {
-			if errors.Is(errors.Cause(err), io.EOF) {
-				break
-			}
-
-			return nil, errors.Wrapf(err, "(%s) could not receive search result", "readFullStream")
-		}
-
-		res = append(res, r.IDList()...)
-	}
-
-	return res, nil
-}
-
 func WithKeyStorage(v *objutil.KeyStorage) Option {
 	return func(c *cfg) {
 		c.keyStorage = v