[#1310] object: Move target initialization to separate package

* Split the logic of write target initialization to different packages;
* Refactor patch and put services: since both service initialize the target
  themselves.

Signed-off-by: Airat Arifullin <a.arifullin@yadro.com>

pkg/services/object/patch/service.go

@@ -2,43 +2,40 @@ package patchsvc
 
 import (
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object"
+	objectwriter "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/common/writer"
 	getsvc "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/get"
-	putsvc "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/put"
-	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/util"
 )
 
 // Service implements Put operation of Object service v2.
 type Service struct {
-	keyStorage *util.KeyStorage
+	*objectwriter.Config
 
 	getSvc *getsvc.Service
-
-	putSvc *putsvc.Service
 }
 
 // NewService constructs Service instance from provided options.
-func NewService(ks *util.KeyStorage, getSvc *getsvc.Service, putSvc *putsvc.Service) *Service {
+//
+// Patch service can use the same objectwriter.Config initializied by Put service.
+func NewService(cfg *objectwriter.Config,
+	getSvc *getsvc.Service,
+) *Service {
 	return &Service{
-		keyStorage: ks,
+		Config: cfg,
 
 		getSvc: getSvc,
-
-		putSvc: putSvc,
 	}
 }
 
 // Put calls internal service and returns v2 object streamer.
 func (s *Service) Patch() (object.PatchObjectStream, error) {
-	nodeKey, err := s.keyStorage.GetKey(nil)
+	nodeKey, err := s.Config.KeyStorage.GetKey(nil)
 	if err != nil {
 		return nil, err
 	}
 
 	return &Streamer{
-		getSvc: s.getSvc,
-
-		putSvc: s.putSvc,
-
+		Config:       s.Config,
+		getSvc:       s.getSvc,
 		localNodeKey: nodeKey,
 	}, nil
 }

pkg/services/object/patch/streamer.go

@@ -9,8 +9,9 @@ import (
 
 	objectV2 "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/object"
 	refsV2 "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/common/target"
+	objectwriter "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/common/writer"
 	getsvc "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/get"
-	putsvc "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/put"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/util"
 	"git.frostfs.info/TrueCloudLab/frostfs-observability/tracing"
 	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
@@ -21,6 +22,8 @@ import (
 // Streamer for the patch handler is a pipeline that merges two incoming streams of patches
 // and original object payload chunks. The merged result is fed to Put stream target.
 type Streamer struct {
+	*objectwriter.Config
+
 	// Patcher must be initialized at first Streamer.Send call.
 	patcher patcher.PatchApplier
 
@@ -28,8 +31,6 @@ type Streamer struct {
 
 	getSvc *getsvc.Service
 
-	putSvc *putsvc.Service
-
 	localNodeKey *ecdsa.PrivateKey
 }
 
@@ -78,11 +79,6 @@ func (s *Streamer) init(ctx context.Context, req *objectV2.PatchRequest) error {
 		localNodeKey: s.localNodeKey,
 	}
 
-	putstm, err := s.putSvc.Put()
-	if err != nil {
-		return err
-	}
-
 	hdr := hdrWithSig.GetHeader()
 	oV2 := new(objectV2.Object)
 	hV2 := new(objectV2.Header)
@@ -97,14 +93,14 @@ func (s *Streamer) init(ctx context.Context, req *objectV2.PatchRequest) error {
 	}
 	oV2.GetHeader().SetOwnerID(ownerID)
 
-	prm, err := s.putInitPrm(req, oV2)
+	target, err := target.New(&objectwriter.Params{
+		Config:                s.Config,
+		Common:                commonPrm,
+		Header:                objectSDK.NewFromV2(oV2),
+		SignRequestPrivateKey: s.localNodeKey,
+	})
 	if err != nil {
-		return err
-	}
-
-	err = putstm.Init(ctx, prm)
-	if err != nil {
-		return err
+		return fmt.Errorf("target creation: %w", err)
 	}
 
 	patcherPrm := patcher.Params{
@@ -112,7 +108,7 @@ func (s *Streamer) init(ctx context.Context, req *objectV2.PatchRequest) error {
 
 		RangeProvider: rangeProvider,
 
-		ObjectWriter: putstm.Target(),
+		ObjectWriter: target,
 	}
 
 	s.patcher = patcher.New(patcherPrm)

pkg/services/object/patch/util.go

@@ -6,31 +6,12 @@ import (
 	"errors"
 	"fmt"
 
-	objectV2 "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/object"
 	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs"
 	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/session"
-	putsvc "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/put"
-	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/util"
-	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 )
 
-// putInitPrm initializes put paramerer for Put stream.
-func (s *Streamer) putInitPrm(req *objectV2.PatchRequest, obj *objectV2.Object) (*putsvc.PutInitPrm, error) {
-	commonPrm, err := util.CommonPrmFromV2(req)
-	if err != nil {
-		return nil, err
-	}
-
-	prm := new(putsvc.PutInitPrm)
-	prm.WithObject(objectSDK.NewFromV2(obj)).
-		WithCommonPrm(commonPrm).
-		WithPrivateKey(s.localNodeKey)
-
-	return prm, nil
-}
-
 func newOwnerID(vh *session.RequestVerificationHeader) (*refs.OwnerID, error) {
 	for vh.GetOrigin() != nil {
 		vh = vh.GetOrigin()