From f251645def39a09ddb0273a607bb1ed0801bfbb0 Mon Sep 17 00:00:00 2001
From: Leonard Lyubich <leonard@nspcc.ru>
Date: Thu, 1 Oct 2020 13:54:18 +0300
Subject: [PATCH] [#58] object/delete: Process linking object in Delete service

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
---
 pkg/services/object/delete/service.go  | 34 ++++++++++++++++++++--
 pkg/services/object/head/relation.go   | 40 ++++++++++++++++++++++++++
 pkg/services/object/search/relation.go |  9 ++++++
 3 files changed, 81 insertions(+), 2 deletions(-)
 create mode 100644 pkg/services/object/head/relation.go

diff --git a/pkg/services/object/delete/service.go b/pkg/services/object/delete/service.go
index 593c51677..97ffa9a8d 100644
--- a/pkg/services/object/delete/service.go
+++ b/pkg/services/object/delete/service.go
@@ -3,7 +3,9 @@ package deletesvc
 import (
 	"context"
 
+	objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
 	"github.com/nspcc-dev/neofs-api-go/pkg/owner"
+	"github.com/nspcc-dev/neofs-node/pkg/core/object"
 	headsvc "github.com/nspcc-dev/neofs-node/pkg/services/object/head"
 	putsvc "github.com/nspcc-dev/neofs-node/pkg/services/object/put"
 	objutil "github.com/nspcc-dev/neofs-node/pkg/services/object/util"
@@ -16,6 +18,10 @@ type Service struct {
 
 type Option func(*cfg)
 
+type RelationHeader interface {
+	HeadRelation(context.Context, *objectSDK.Address) (*object.Object, error)
+}
+
 type cfg struct {
 	ownerID *owner.ID
 
@@ -24,6 +30,8 @@ type cfg struct {
 	putSvc *putsvc.Service
 
 	headSvc *headsvc.Service
+
+	hdrLinking RelationHeader
 }
 
 func defaultCfg() *cfg {
@@ -60,8 +68,24 @@ func (s *Service) Delete(ctx context.Context, prm *Prm) (*Response, error) {
 		commonPrm: prm.common,
 	}
 
-	if err := s.deleteAll(tool); err != nil {
-		return nil, errors.Wrapf(err, "(%T) could not delete all objcet relations", s)
+	if linking, err := s.hdrLinking.HeadRelation(ctx, prm.addr); err != nil {
+		if err := s.deleteAll(tool); err != nil {
+			return nil, errors.Wrapf(err, "(%T) could not delete all object relations", s)
+		}
+	} else {
+		if err := tool.delete(prm.addr.GetObjectID()); err != nil {
+			return nil, errors.Wrapf(err, "(%T) could not delete object", s)
+		}
+
+		for _, child := range linking.GetChildren() {
+			if err := tool.delete(child); err != nil {
+				return nil, errors.Wrapf(err, "(%T) could not delete child object", s)
+			}
+		}
+
+		if err := tool.delete(linking.GetID()); err != nil {
+			return nil, errors.Wrapf(err, "(%T) could not delete linking object", s)
+		}
 	}
 
 	return new(Response), nil
@@ -124,3 +148,9 @@ func WitHeadService(v *headsvc.Service) Option {
 		c.headSvc = v
 	}
 }
+
+func WithLinkingHeader(v RelationHeader) Option {
+	return func(c *cfg) {
+		c.hdrLinking = v
+	}
+}
diff --git a/pkg/services/object/head/relation.go b/pkg/services/object/head/relation.go
new file mode 100644
index 000000000..276d3c1f4
--- /dev/null
+++ b/pkg/services/object/head/relation.go
@@ -0,0 +1,40 @@
+package headsvc
+
+import (
+	"context"
+
+	objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
+	"github.com/nspcc-dev/neofs-node/pkg/core/object"
+	"github.com/pkg/errors"
+)
+
+type RelationHeader struct {
+	srch RelationSearcher
+
+	svc *Service
+}
+
+func NewRelationHeader(srch RelationSearcher, svc *Service) *RelationHeader {
+	return &RelationHeader{
+		srch: srch,
+		svc:  svc,
+	}
+}
+
+func (h *RelationHeader) HeadRelation(ctx context.Context, addr *objectSDK.Address) (*object.Object, error) {
+	id, err := h.srch.SearchRelation(ctx, addr)
+	if err != nil {
+		return nil, errors.Wrapf(err, "(%T) could not find relation", h)
+	}
+
+	a := objectSDK.NewAddress()
+	a.SetContainerID(addr.GetContainerID())
+	a.SetObjectID(id)
+
+	r, err := h.svc.Head(ctx, new(Prm).WithAddress(a))
+	if err != nil {
+		return nil, errors.Wrapf(err, "(%T) could not receive relation header", h)
+	}
+
+	return r.Header(), nil
+}
diff --git a/pkg/services/object/search/relation.go b/pkg/services/object/search/relation.go
index 99da04c26..c6eeec5a3 100644
--- a/pkg/services/object/search/relation.go
+++ b/pkg/services/object/search/relation.go
@@ -62,3 +62,12 @@ func NewRightChildSearcher(svc *Service) *RelationSearcher {
 		},
 	}
 }
+
+func NewLinkingSearcher(svc *Service) *RelationSearcher {
+	return &RelationSearcher{
+		svc: svc,
+		queryGenerator: func(addr *object.Address) query.Query {
+			return queryV1.NewLinkingQuery(addr.GetObjectID())
+		},
+	}
+}