pkg/core: Separate HeaderWriter from object.Target interface

Also, reuse it in the get service.

Signed-off-by: Pavel Karpy <[email protected]>

pkg/core/object/target.go

@@ -7,8 +7,9 @@ import (
 	oid "github.com/nspcc-dev/neofs-sdk-go/object/id"
 )
 
-// Target is an interface of the object writer.
-type Target interface {
+// HeaderWriter is an interface of target component
+// to write object header.
+type HeaderWriter interface {
 	// WriteHeader writes object header w/ payload part.
 	// The payload of the object may be incomplete.
 	//
@@ -18,7 +19,11 @@ type Target interface {
 	//
 	// Must not be called after Close call.
 	WriteHeader(*object.Object) error
+}
 
+// Target is an interface of the object writer.
+type Target interface {
+	HeaderWriter
 	// Write writes object payload chunk.
 	//
 	// Can be called multiple times.

pkg/services/object/get/prm.go

@@ -7,6 +7,7 @@ import (
 	"hash"
 
 	coreclient "github.com/nspcc-dev/neofs-node/pkg/core/client"
+	objectcore "github.com/nspcc-dev/neofs-node/pkg/core/object"
 	"github.com/nspcc-dev/neofs-node/pkg/services/object/util"
 	"github.com/nspcc-dev/neofs-sdk-go/object"
 	oid "github.com/nspcc-dev/neofs-sdk-go/object/id"
@@ -93,15 +94,9 @@ type ChunkWriter interface {
 	WriteChunk([]byte) error
 }
 
-// HeaderWriter is an interface of target component
-// to write object header.
-type HeaderWriter interface {
-	WriteHeader(*object.Object) error
-}
-
 // ObjectWriter is an interface of target component to write object.
 type ObjectWriter interface {
-	HeaderWriter
+	objectcore.HeaderWriter
 	ChunkWriter
 }
 
@@ -166,7 +161,7 @@ func (p *commonPrm) WithCachedSignerKey(signerKey *ecdsa.PrivateKey) {
 }
 
 // SetHeaderWriter sets target component to write the object header.
-func (p *HeadPrm) SetHeaderWriter(w HeaderWriter) {
+func (p *HeadPrm) SetHeaderWriter(w objectcore.HeaderWriter) {
 	p.objWriter = &partWriter{
 		headWriter: w,
 	}

pkg/services/object/get/util.go

@@ -7,6 +7,7 @@ import (
 
 	coreclient "github.com/nspcc-dev/neofs-node/pkg/core/client"
 	"github.com/nspcc-dev/neofs-node/pkg/core/netmap"
+	objectcore "github.com/nspcc-dev/neofs-node/pkg/core/object"
 	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/engine"
 	internal "github.com/nspcc-dev/neofs-node/pkg/services/object/internal/client"
 	internalclient "github.com/nspcc-dev/neofs-node/pkg/services/object/internal/client"
@@ -35,7 +36,7 @@ type storageEngineWrapper struct {
 type partWriter struct {
 	ObjectWriter
 
-	headWriter HeaderWriter
+	headWriter objectcore.HeaderWriter
 
 	chunkWriter ChunkWriter
 }