[#233] services/object: Implement new Get algorithm

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

cmd/neofs-node/config.go

@@ -108,6 +108,7 @@ const (
 	cfgObjectRangeDialTimeout     = "object.range.dial_timeout"
 	cfgObjectRangeHashDialTimeout = "object.rangehash.dial_timeout"
 	cfgObjectSearchDialTimeout    = "object.search.dial_timeout"
+	cfgObjectGetDialTimeout       = "object.get.dial_timeout"
 )
 
 const (

cmd/neofs-node/object.go

@@ -155,8 +155,8 @@ func (s *objectSvc) Search(ctx context.Context, req *object.SearchRequest) (obje
 	return s.search.Search(ctx, req)
 }
 
-func (s *objectSvc) Get(ctx context.Context, req *object.GetRequest) (object.GetObjectStreamer, error) {
+func (s *objectSvc) Get(req *object.GetRequest, stream objectService.GetObjectStream) error {
-	return s.get.Get(ctx, req)
+	return s.get.Get(req, stream)
 }
 
 func (s *objectSvc) Delete(ctx context.Context, req *object.DeleteRequest) (*object.DeleteResponse, error) {
@@ -291,6 +291,8 @@ func initObjectService(c *cfg) {
 		}
 	})
 
+	traverseGen := util.NewTraverserGenerator(c.cfgObject.netMapStorage, c.cfgObject.cnrStorage, c)
+
 	c.workers = append(c.workers, pol)
 
 	sPut := putsvc.NewService(
@@ -372,12 +374,24 @@ func initObjectService(c *cfg) {
 		rangesvcV2.WithInternalService(sRange),
 	)
 
-	sGet := getsvc.NewService(
+	sGet := getsvc.New(
-		getsvc.WithRangeService(sRange),
+		getsvc.WithLogger(c.log),
+		getsvc.WithLocalStorageEngine(ls),
+		getsvc.WithClientCache(clientCache),
+		getsvc.WithHeadService(sHead),
+		getsvc.WithClientOptions(
+			client.WithDialTimeout(c.viper.GetDuration(cfgObjectGetDialTimeout)),
+		),
+		getsvc.WithTraverserGenerator(
+			traverseGen.WithTraverseOptions(
+				placement.SuccessAfter(1),
+			),
+		),
 	)
 
 	sGetV2 := getsvcV2.NewService(
 		getsvcV2.WithInternalService(sGet),
+		getsvcV2.WithKeyStorage(keyStorage),
 	)
 
 	sRangeHash := rangehashsvc.NewService(

pkg/network/transport/object/grpc/get.go

@@ -0,0 +1,28 @@
+package object
+
+import (
+	"github.com/nspcc-dev/neofs-api-go/v2/object"
+	objectGRPC "github.com/nspcc-dev/neofs-api-go/v2/object/grpc"
+)
+
+type getStreamerV2 struct {
+	objectGRPC.ObjectService_GetServer
+}
+
+func (s *getStreamerV2) Send(resp *object.GetResponse) error {
+	return s.ObjectService_GetServer.Send(
+		object.GetResponseToGRPCMessage(resp),
+	)
+}
+
+// Get converts gRPC GetRequest message and server-side stream and overtakes its data
+// to gRPC stream.
+func (s *Server) Get(req *objectGRPC.GetRequest, gStream objectGRPC.ObjectService_GetServer) error {
+	// TODO: think about how we transport errors through gRPC
+	return s.srv.Get(
+		object.GetRequestFromGRPCMessage(req),
+		&getStreamerV2{
+			ObjectService_GetServer: gStream,
+		},
+	)
+}

pkg/network/transport/object/grpc/service.go

@@ -6,47 +6,23 @@ import (
 
 	"github.com/nspcc-dev/neofs-api-go/v2/object"
 	objectGRPC "github.com/nspcc-dev/neofs-api-go/v2/object/grpc"
+	objectSvc "github.com/nspcc-dev/neofs-node/pkg/services/object"
 	"github.com/pkg/errors"
 )
 
 // Server wraps NeoFS API Object service and
 // provides gRPC Object service server interface.
 type Server struct {
-	srv object.Service
+	srv objectSvc.ServiceServer
 }
 
 // New creates, initializes and returns Server instance.
-func New(c object.Service) *Server {
+func New(c objectSvc.ServiceServer) *Server {
 	return &Server{
 		srv: c,
 	}
 }
 
-// Get converts gRPC GetRequest message, opens internal Object service Get stream and overtakes its data
-// to gRPC stream.
-func (s *Server) Get(req *objectGRPC.GetRequest, gStream objectGRPC.ObjectService_GetServer) error {
-	stream, err := s.srv.Get(gStream.Context(), object.GetRequestFromGRPCMessage(req))
-	if err != nil {
-		// TODO: think about how we transport errors through gRPC
-		return err
-	}
-
-	for {
-		r, err := stream.Recv()
-		if err != nil {
-			if errors.Is(errors.Cause(err), io.EOF) {
-				return nil
-			}
-
-			return err
-		}
-
-		if err := gStream.Send(object.GetResponseToGRPCMessage(r)); err != nil {
-			return err
-		}
-	}
-}
-
 // Put opens internal Object service Put stream and overtakes data from gRPC stream to it.
 func (s *Server) Put(gStream objectGRPC.ObjectService_PutServer) error {
 	stream, err := s.srv.Put(gStream.Context())

pkg/services/object/acl/acl.go

@@ -18,6 +18,7 @@ import (
 	core "github.com/nspcc-dev/neofs-node/pkg/core/container"
 	"github.com/nspcc-dev/neofs-node/pkg/core/netmap"
 	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/engine"
+	objectSvc "github.com/nspcc-dev/neofs-node/pkg/services/object"
 	"github.com/nspcc-dev/neofs-node/pkg/services/object/acl/eacl"
 	eaclV2 "github.com/nspcc-dev/neofs-node/pkg/services/object/acl/eacl/v2"
 	"github.com/pkg/errors"
@@ -37,7 +38,8 @@ type (
 	}
 
 	getStreamBasicChecker struct {
-		next object.GetObjectStreamer
+		objectSvc.GetObjectStream
+
 		info requestInfo
 
 		*eACLCfg
@@ -74,7 +76,7 @@ type cfg struct {
 
 	sender SenderClassifier
 
-	next object.Service
+	next objectSvc.ServiceServer
 
 	*eACLCfg
 }
@@ -123,12 +125,10 @@ func New(opts ...Option) Service {
 	}
 }
 
-func (b Service) Get(
+func (b Service) Get(request *object.GetRequest, stream objectSvc.GetObjectStream) error {
-	ctx context.Context,
-	request *object.GetRequest) (object.GetObjectStreamer, error) {
 	cid, err := getContainerIDFromRequest(request)
 	if err != nil {
-		return nil, err
+		return err
 	}
 
 	req := metaWithToken{
@@ -139,22 +139,20 @@ func (b Service) Get(
 
 	reqInfo, err := b.findRequestInfo(req, cid, acl.OperationGet)
 	if err != nil {
-		return nil, err
+		return err
 	}
 
 	if !basicACLCheck(reqInfo) {
-		return nil, basicACLErr(reqInfo)
+		return basicACLErr(reqInfo)
 	} else if !eACLCheck(request, reqInfo, b.eACLCfg) {
-		return nil, eACLErr(reqInfo)
+		return eACLErr(reqInfo)
 	}
 
-	stream, err := b.next.Get(ctx, request)
+	return b.next.Get(request, &getStreamBasicChecker{
-
+		GetObjectStream: stream,
-	return getStreamBasicChecker{
-		next:    stream,
 		info:            reqInfo,
 		eACLCfg:         b.eACLCfg,
-	}, err
+	})
 }
 
 func (b Service) Put(ctx context.Context) (object.PutObjectStreamer, error) {
@@ -366,32 +364,14 @@ func (p putStreamBasicChecker) CloseAndRecv() (*object.PutResponse, error) {
 	return p.next.CloseAndRecv()
 }
 
-func (g getStreamBasicChecker) Recv() (*object.GetResponse, error) {
+func (g *getStreamBasicChecker) Send(resp *object.GetResponse) error {
-	resp, err := g.next.Recv()
+	if _, ok := resp.GetBody().GetObjectPart().(*object.GetObjectPartInit); ok {
-	if err != nil {
+		if !eACLCheck(resp, g.info, g.eACLCfg) {
-		return resp, err
+			return eACLErr(g.info)
-	}
-
-	body := resp.GetBody()
-	if body == nil {
-		return resp, err
-	}
-
-	part := body.GetObjectPart()
-	if _, ok := part.(*object.GetObjectPartInit); ok {
-		ownerID, err := getObjectOwnerFromMessage(resp)
-		if err != nil {
-			return nil, err
-		}
-
-		if !stickyBitCheck(g.info, ownerID) {
-			return nil, basicACLErr(g.info)
-		} else if !eACLCheck(resp, g.info, g.eACLCfg) {
-			return nil, eACLErr(g.info)
 		}
 	}
 
-	return resp, err
+	return g.GetObjectStream.Send(resp)
 }
 
 func (b Service) findRequestInfo(

pkg/services/object/acl/opts.go

@@ -1,10 +1,10 @@
 package acl
 
 import (
-	"github.com/nspcc-dev/neofs-api-go/v2/object"
 	"github.com/nspcc-dev/neofs-node/pkg/core/container"
 	"github.com/nspcc-dev/neofs-node/pkg/core/netmap"
 	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/engine"
+	objectSvc "github.com/nspcc-dev/neofs-node/pkg/services/object"
 	"github.com/nspcc-dev/neofs-node/pkg/services/object/acl/eacl"
 )
 
@@ -23,7 +23,7 @@ func WithSenderClassifier(v SenderClassifier) Option {
 }
 
 // WithNextService returns option to set next object service.
-func WithNextService(v object.Service) Option {
+func WithNextService(v objectSvc.ServiceServer) Option {
 	return func(c *cfg) {
 		c.next = v
 	}

pkg/services/object/get/assemble.go

@@ -0,0 +1,130 @@
+package getsvc
+
+import (
+	objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
+	"github.com/nspcc-dev/neofs-node/pkg/core/object"
+	"go.uber.org/zap"
+)
+
+func (exec *execCtx) assemble() {
+	if !exec.canAssemble() {
+		exec.log.Debug("can not assemble the object")
+		return
+	}
+
+	exec.log.Debug("trying to assemble the object...")
+
+	splitInfo := exec.splitInfo()
+
+	childID := splitInfo.Link()
+	if childID == nil {
+		childID = splitInfo.LastPart()
+	}
+
+	prev, children := exec.initFromChild(childID)
+
+	if len(children) > 0 {
+		if ok := exec.writeCollectedHeader(); ok {
+			exec.overtakePayloadDirectly(children)
+		}
+	} else if prev != nil {
+		if ok := exec.writeCollectedHeader(); ok {
+			// TODO: choose one-by-one restoring algorithm according to size
+			//  * if size > MAX => go right-to-left with HEAD and back with GET
+			//  * else go right-to-left with GET and compose in single object before writing
+
+			if ok := exec.overtakePayloadInReverse(prev); ok {
+				// payload of all children except the last are written, write last payload
+				exec.writeObjectPayload(exec.collectedObject)
+			}
+		}
+	} else {
+		exec.status = statusUndefined
+		exec.err = object.ErrNotFound
+
+		exec.log.Debug("could not init parent from child")
+	}
+}
+
+func (exec *execCtx) initFromChild(id *objectSDK.ID) (prev *objectSDK.ID, children []*objectSDK.ID) {
+	log := exec.log.With(zap.Stringer("child ID", id))
+
+	log.Debug("starting assembling from child")
+
+	child, ok := exec.getChild(id)
+	if !ok {
+		return
+	}
+
+	par := child.GetParent()
+	if par == nil {
+		exec.status = statusUndefined
+
+		log.Debug("received child with empty parent")
+
+		return
+	} else if !equalAddresses(par.Address(), exec.address()) {
+		exec.status = statusUndefined
+
+		log.Debug("parent address in child object differs",
+			zap.Stringer("expected", exec.address()),
+			zap.Stringer("received", par.Address()),
+		)
+
+		return
+	}
+
+	exec.collectedObject = par
+	object.NewRawFromObject(exec.collectedObject).SetPayload(child.Payload())
+
+	return child.PreviousID(), child.Children()
+}
+
+func (exec *execCtx) overtakePayloadDirectly(children []*objectSDK.ID) {
+	for i := range children {
+		child, ok := exec.getChild(children[i])
+		if !ok {
+			return
+		}
+
+		if ok := exec.writeObjectPayload(child); !ok {
+			return
+		}
+	}
+
+	exec.status = statusOK
+	exec.err = nil
+}
+
+func (exec *execCtx) overtakePayloadInReverse(prev *objectSDK.ID) bool {
+	chain := make([]*objectSDK.ID, 0)
+
+	// fill the chain end-to-start
+	for prev != nil {
+		head, ok := exec.headChild(prev)
+		if !ok {
+			return false
+		}
+
+		chain = append(chain, head.ID())
+
+		prev = head.PreviousID()
+	}
+
+	// reverse chain
+	for left, right := 0, len(chain)-1; left < right; left, right = left+1, right-1 {
+		chain[left], chain[right] = chain[right], chain[left]
+	}
+
+	exec.overtakePayloadDirectly(chain)
+
+	exec.status = statusOK
+	exec.err = nil
+
+	return true
+}
+
+func equalAddresses(a, b *objectSDK.Address) bool {
+	return a.ContainerID().Equal(b.ContainerID()) &&
+		a.ObjectID().Equal(b.ObjectID())
+}

pkg/services/object/get/container.go

@@ -0,0 +1,54 @@
+package getsvc
+
+import (
+	"context"
+
+	"go.uber.org/zap"
+)
+
+func (exec *execCtx) executeOnContainer() {
+	if exec.isLocal() {
+		exec.log.Debug("return result directly")
+		return
+	}
+
+	exec.log.Debug("trying to execute in container...")
+
+	traverser, ok := exec.generateTraverser(exec.address())
+	if !ok {
+		return
+	}
+
+	ctx, cancel := context.WithCancel(exec.context())
+	defer cancel()
+
+	exec.status = statusUndefined
+
+loop:
+	for {
+		addrs := traverser.Next()
+		if len(addrs) == 0 {
+			exec.log.Debug("no more nodes, abort placement iteration")
+			break
+		}
+
+		for i := range addrs {
+			select {
+			case <-ctx.Done():
+				exec.log.Debug("interrupt placement iteration by context",
+					zap.String("error", ctx.Err().Error()),
+				)
+				break loop
+			default:
+			}
+
+			// TODO: consider parallel execution
+			// TODO: consider optimization: if status == SPLIT we can continue until
+			//  we reach the best result - split info with linking object ID.
+			if exec.processNode(ctx, addrs[i]) {
+				exec.log.Debug("completing the operation")
+				break loop
+			}
+		}
+	}
+}

pkg/services/object/get/exec.go

@@ -0,0 +1,250 @@
+package getsvc
+
+import (
+	"context"
+	"crypto/ecdsa"
+
+	"github.com/nspcc-dev/neofs-api-go/pkg/client"
+	"github.com/nspcc-dev/neofs-api-go/pkg/container"
+	objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
+	"github.com/nspcc-dev/neofs-node/pkg/core/object"
+	"github.com/nspcc-dev/neofs-node/pkg/network"
+	"github.com/nspcc-dev/neofs-node/pkg/services/object_manager/placement"
+	"github.com/nspcc-dev/neofs-node/pkg/util/logger"
+	"go.uber.org/zap"
+)
+
+type statusError struct {
+	status int
+	err    error
+}
+
+type execCtx struct {
+	svc *Service
+
+	ctx context.Context
+
+	prm Prm
+
+	statusError
+
+	infoSplit *objectSDK.SplitInfo
+
+	log *logger.Logger
+
+	collectedObject *object.Object
+}
+
+const (
+	statusUndefined int = iota
+	statusOK
+	statusINHUMED
+	statusVIRTUAL
+)
+
+func (exec *execCtx) setLogger(l *logger.Logger) {
+	exec.log = l.With(
+		zap.String("request", "GET"),
+		zap.Stringer("address", exec.address()),
+		zap.Bool("raw", exec.isRaw()),
+		zap.Bool("local", exec.isLocal()),
+		zap.Bool("with session", exec.prm.common.SessionToken() != nil),
+		zap.Bool("with bearer", exec.prm.common.BearerToken() != nil),
+	)
+}
+
+func (exec execCtx) context() context.Context {
+	return exec.ctx
+}
+
+func (exec execCtx) isLocal() bool {
+	return exec.prm.common.LocalOnly()
+}
+
+func (exec execCtx) isRaw() bool {
+	return exec.prm.raw
+}
+
+func (exec execCtx) address() *objectSDK.Address {
+	return exec.prm.addr
+}
+
+func (exec execCtx) key() *ecdsa.PrivateKey {
+	return exec.prm.key
+}
+
+func (exec execCtx) callOptions() []client.CallOption {
+	return exec.prm.callOpts
+}
+
+func (exec execCtx) remotePrm() *client.GetObjectParams {
+	return new(client.GetObjectParams).
+		WithAddress(exec.prm.addr).
+		WithRawFlag(exec.prm.raw)
+}
+
+func (exec *execCtx) canAssemble() bool {
+	return exec.svc.assembly && !exec.isRaw()
+}
+
+func (exec *execCtx) splitInfo() *objectSDK.SplitInfo {
+	return exec.infoSplit
+}
+
+func (exec *execCtx) containerID() *container.ID {
+	return exec.address().ContainerID()
+}
+
+func (exec *execCtx) generateTraverser(addr *objectSDK.Address) (*placement.Traverser, bool) {
+	t, err := exec.svc.traverserGenerator.GenerateTraverser(addr)
+
+	switch {
+	default:
+		exec.status = statusUndefined
+		exec.err = err
+
+		exec.log.Debug("could not generate container traverser",
+			zap.String("error", err.Error()),
+		)
+
+		return nil, false
+	case err == nil:
+		return t, true
+	}
+}
+
+func (exec *execCtx) getChild(id *objectSDK.ID) (*object.Object, bool) {
+	w := newSimpleObjectWriter()
+
+	p := exec.prm
+	p.common = p.common.WithLocalOnly(false)
+	p.SetObjectWriter(w)
+
+	addr := objectSDK.NewAddress()
+	addr.SetContainerID(exec.address().ContainerID())
+	addr.SetObjectID(id)
+
+	p.SetAddress(addr)
+
+	exec.statusError = exec.svc.get(exec.context(), p)
+
+	return w.object(), exec.status == statusOK
+}
+
+func (exec *execCtx) headChild(id *objectSDK.ID) (*object.Object, bool) {
+	childAddr := objectSDK.NewAddress()
+	childAddr.SetContainerID(exec.containerID())
+	childAddr.SetObjectID(id)
+
+	p := exec.prm
+	p.common = p.common.WithLocalOnly(false)
+	p.SetAddress(childAddr)
+
+	header, err := exec.svc.headSvc.head(exec.context(), p)
+
+	switch {
+	default:
+		exec.status = statusUndefined
+		exec.err = err
+
+		exec.log.Debug("could not get child object header",
+			zap.Stringer("child ID", id),
+			zap.String("error", err.Error()),
+		)
+
+		return nil, false
+	case err == nil:
+		exec.status = statusOK
+		exec.err = nil
+
+		return header, true
+	}
+}
+
+func (exec execCtx) remoteClient(node *network.Address) (getClient, bool) {
+	ipAddr, err := node.IPAddrString()
+
+	log := exec.log.With(zap.Stringer("node", node))
+
+	switch {
+	default:
+		exec.status = statusUndefined
+		exec.err = err
+
+		log.Debug("could not calculate node IP address")
+	case err == nil:
+		c, err := exec.svc.clientCache.get(exec.key(), ipAddr)
+
+		switch {
+		default:
+			exec.status = statusUndefined
+			exec.err = err
+
+			log.Debug("could not construct remote node client")
+		case err == nil:
+			return c, true
+		}
+	}
+
+	return nil, false
+}
+
+func mergeSplitInfo(dst, src *objectSDK.SplitInfo) {
+	if last := src.LastPart(); last != nil {
+		dst.SetLastPart(last)
+	}
+
+	if link := src.Link(); link != nil {
+		dst.SetLink(link)
+	}
+
+	if splitID := src.SplitID(); splitID != nil {
+		dst.SetSplitID(splitID)
+	}
+}
+
+func (exec *execCtx) writeCollectedHeader() bool {
+	err := exec.prm.objWriter.WriteHeader(
+		object.NewRawFromObject(exec.collectedObject).CutPayload().Object(),
+	)
+
+	switch {
+	default:
+		exec.status = statusUndefined
+		exec.err = err
+
+		exec.log.Debug("could not write header",
+			zap.String("error", err.Error()),
+		)
+	case err == nil:
+		exec.status = statusOK
+		exec.err = nil
+	}
+
+	return exec.status == statusOK
+}
+
+func (exec *execCtx) writeObjectPayload(obj *object.Object) bool {
+	err := exec.prm.objWriter.WriteChunk(obj.Payload())
+
+	switch {
+	default:
+		exec.status = statusUndefined
+		exec.err = err
+
+		exec.log.Debug("could not write payload chunk",
+			zap.String("error", err.Error()),
+		)
+	case err == nil:
+		exec.status = statusOK
+		exec.err = nil
+	}
+
+	return err == nil
+}
+
+func (exec *execCtx) writeCollectedObject() {
+	if ok := exec.writeCollectedHeader(); ok {
+		exec.writeObjectPayload(exec.collectedObject)
+	}
+}

pkg/services/object/get/get.go

@@ -0,0 +1,59 @@
+package getsvc
+
+import (
+	"context"
+
+	objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
+	"go.uber.org/zap"
+)
+
+// Get serves a request to get an object by address, and returns Streamer instance.
+func (s *Service) Get(ctx context.Context, prm Prm) error {
+	return s.get(ctx, prm).err
+}
+
+func (s *Service) get(ctx context.Context, prm Prm) statusError {
+	exec := &execCtx{
+		svc:       s,
+		ctx:       ctx,
+		prm:       prm,
+		infoSplit: objectSDK.NewSplitInfo(),
+	}
+
+	exec.setLogger(s.log)
+
+	exec.execute()
+
+	return exec.statusError
+}
+
+func (exec *execCtx) execute() {
+	exec.log.Debug("serving request...")
+
+	// perform local operation
+	exec.executeLocal()
+
+	exec.analyzeStatus(true)
+}
+
+func (exec *execCtx) analyzeStatus(execCnr bool) {
+	// analyze local result
+	switch exec.status {
+	case statusOK:
+		exec.log.Debug("operation finished successfully")
+	case statusINHUMED:
+		exec.log.Debug("requested object was marked as removed")
+	case statusVIRTUAL:
+		exec.log.Debug("requested object is virtual")
+		exec.assemble()
+	default:
+		exec.log.Debug("operation finished with error",
+			zap.String("error", exec.err.Error()),
+		)
+
+		if execCnr {
+			exec.executeOnContainer()
+			exec.analyzeStatus(false)
+		}
+	}
+}

pkg/services/object/get/get_test.go

@@ -0,0 +1,847 @@
+package getsvc
+
+import (
+	"context"
+	"crypto/ecdsa"
+	"crypto/rand"
+	"crypto/sha256"
+	"fmt"
+	"strconv"
+	"testing"
+
+	"github.com/nspcc-dev/neofs-api-go/pkg/container"
+	"github.com/nspcc-dev/neofs-api-go/pkg/netmap"
+	objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
+	"github.com/nspcc-dev/neofs-node/pkg/core/object"
+	"github.com/nspcc-dev/neofs-node/pkg/network"
+	"github.com/nspcc-dev/neofs-node/pkg/services/object/util"
+	"github.com/nspcc-dev/neofs-node/pkg/services/object_manager/placement"
+	"github.com/nspcc-dev/neofs-node/pkg/util/logger/test"
+	"github.com/pkg/errors"
+	"github.com/stretchr/testify/require"
+)
+
+type testStorage struct {
+	inhumed map[string]struct{}
+
+	virtual map[string]*objectSDK.SplitInfo
+
+	phy map[string]*object.Object
+}
+
+type testTraverserGenerator struct {
+	c *container.Container
+	b placement.Builder
+}
+
+type testPlacementBuilder struct {
+	vectors map[string][]netmap.Nodes
+}
+
+type testClientCache struct {
+	clients map[string]*testClient
+}
+
+type testClient struct {
+	results map[string]struct {
+		obj *object.RawObject
+		err error
+	}
+}
+
+func newTestStorage() *testStorage {
+	return &testStorage{
+		inhumed: make(map[string]struct{}),
+		virtual: make(map[string]*objectSDK.SplitInfo),
+		phy:     make(map[string]*object.Object),
+	}
+}
+
+func (g *testTraverserGenerator) GenerateTraverser(addr *objectSDK.Address) (*placement.Traverser, error) {
+	return placement.NewTraverser(
+		placement.ForContainer(g.c),
+		placement.ForObject(addr.ObjectID()),
+		placement.UseBuilder(g.b),
+		placement.SuccessAfter(1),
+	)
+}
+
+func (p *testPlacementBuilder) BuildPlacement(addr *objectSDK.Address, _ *netmap.PlacementPolicy) ([]netmap.Nodes, error) {
+	vs, ok := p.vectors[addr.String()]
+	if !ok {
+		return nil, errors.New("vectors for address not found")
+	}
+
+	return vs, nil
+}
+
+func (c *testClientCache) get(_ *ecdsa.PrivateKey, addr string) (getClient, error) {
+	v, ok := c.clients[addr]
+	if !ok {
+		return nil, errors.New("could not construct client")
+	}
+
+	return v, nil
+}
+
+func newTestClient() *testClient {
+	return &testClient{
+		results: map[string]struct {
+			obj *object.RawObject
+			err error
+		}{},
+	}
+}
+
+func (c *testClient) GetObject(_ context.Context, p Prm) (*objectSDK.Object, error) {
+	v, ok := c.results[p.addr.String()]
+	if !ok {
+		return nil, object.ErrNotFound
+	}
+
+	return v.obj.Object().SDK(), v.err
+}
+
+func (c *testClient) head(_ context.Context, p Prm) (*object.Object, error) {
+	v, ok := c.results[p.addr.String()]
+	if !ok {
+		return nil, object.ErrNotFound
+	}
+
+	if v.err != nil {
+		return nil, v.err
+	}
+
+	return v.obj.CutPayload().Object(), nil
+}
+
+func (c *testClient) addResult(addr *objectSDK.Address, obj *object.RawObject, err error) {
+	c.results[addr.String()] = struct {
+		obj *object.RawObject
+		err error
+	}{obj: obj, err: err}
+}
+
+func (s *testStorage) Get(addr *objectSDK.Address) (*object.Object, error) {
+	var (
+		ok    bool
+		obj   *object.Object
+		sAddr = addr.String()
+	)
+
+	if _, ok = s.inhumed[sAddr]; ok {
+		return nil, object.ErrAlreadyRemoved
+	}
+
+	if info, ok := s.virtual[sAddr]; ok {
+		return nil, objectSDK.NewSplitInfoError(info)
+	}
+
+	if obj, ok = s.phy[sAddr]; ok {
+		return obj, nil
+	}
+
+	return nil, object.ErrNotFound
+}
+
+func (s *testStorage) addPhy(addr *objectSDK.Address, obj *object.RawObject) {
+	s.phy[addr.String()] = obj.Object()
+}
+
+func (s *testStorage) addVirtual(addr *objectSDK.Address, info *objectSDK.SplitInfo) {
+	s.virtual[addr.String()] = info
+}
+
+func (s *testStorage) inhume(addr *objectSDK.Address) {
+	s.inhumed[addr.String()] = struct{}{}
+}
+
+func testSHA256() (cs [sha256.Size]byte) {
+	rand.Read(cs[:])
+	return cs
+}
+
+func generateID() *objectSDK.ID {
+	id := objectSDK.NewID()
+	id.SetSHA256(testSHA256())
+
+	return id
+}
+
+func generateAddress() *objectSDK.Address {
+	addr := objectSDK.NewAddress()
+	addr.SetObjectID(generateID())
+
+	cid := container.NewID()
+	cid.SetSHA256(testSHA256())
+
+	addr.SetContainerID(cid)
+
+	return addr
+}
+
+func generateObject(addr *objectSDK.Address, prev *objectSDK.ID, payload []byte, children ...*objectSDK.ID) *object.RawObject {
+	obj := object.NewRaw()
+	obj.SetContainerID(addr.ContainerID())
+	obj.SetID(addr.ObjectID())
+	obj.SetPayload(payload)
+	obj.SetPreviousID(prev)
+	obj.SetChildren(children...)
+
+	return obj
+}
+
+func TestGetLocalOnly(t *testing.T) {
+	ctx := context.Background()
+
+	newSvc := func(storage *testStorage) *Service {
+		svc := &Service{cfg: new(cfg)}
+		svc.log = test.NewLogger(false)
+		svc.localStorage = storage
+		svc.assembly = true
+
+		return svc
+	}
+
+	newPrm := func(raw bool, w ObjectWriter) Prm {
+		return Prm{
+			objWriter: w,
+			raw:       raw,
+			common:    new(util.CommonPrm).WithLocalOnly(true),
+		}
+	}
+
+	t.Run("OK", func(t *testing.T) {
+		storage := newTestStorage()
+		svc := newSvc(storage)
+
+		w := newSimpleObjectWriter()
+		p := newPrm(false, w)
+
+		addr := generateAddress()
+		obj := generateObject(addr, nil, nil)
+
+		storage.addPhy(addr, obj)
+
+		p.addr = addr
+
+		storage.addPhy(addr, obj)
+
+		err := svc.Get(ctx, p)
+
+		require.NoError(t, err)
+
+		require.Equal(t, obj.Object(), w.object())
+	})
+
+	t.Run("INHUMED", func(t *testing.T) {
+		storage := newTestStorage()
+		svc := newSvc(storage)
+
+		p := newPrm(false, nil)
+
+		addr := generateAddress()
+
+		storage.inhume(addr)
+
+		p.addr = addr
+
+		err := svc.Get(ctx, p)
+
+		require.True(t, errors.Is(err, object.ErrAlreadyRemoved))
+	})
+
+	t.Run("404", func(t *testing.T) {
+		storage := newTestStorage()
+		svc := newSvc(storage)
+
+		p := newPrm(false, nil)
+
+		addr := generateAddress()
+
+		p.addr = addr
+
+		err := svc.Get(ctx, p)
+
+		require.True(t, errors.Is(err, object.ErrNotFound))
+	})
+
+	t.Run("VIRTUAL", func(t *testing.T) {
+		storage := newTestStorage()
+		svc := newSvc(storage)
+
+		p := newPrm(true, nil)
+
+		addr := generateAddress()
+
+		splitInfo := objectSDK.NewSplitInfo()
+		splitInfo.SetSplitID(objectSDK.NewSplitID())
+		splitInfo.SetLink(generateID())
+		splitInfo.SetLastPart(generateID())
+
+		p.addr = addr
+
+		storage.addVirtual(addr, splitInfo)
+
+		err := svc.Get(ctx, p)
+
+		errSplit := objectSDK.NewSplitInfoError(objectSDK.NewSplitInfo())
+
+		require.True(t, errors.As(err, &errSplit))
+
+		require.Equal(t, splitInfo, errSplit.SplitInfo())
+	})
+}
+
+func testNodeMatrix(t testing.TB, dim []int) ([]netmap.Nodes, [][]string) {
+	mNodes := make([]netmap.Nodes, len(dim))
+	mAddr := make([][]string, len(dim))
+
+	for i := range dim {
+		ns := make([]netmap.NodeInfo, dim[i])
+		as := make([]string, dim[i])
+
+		for j := 0; j < dim[i]; j++ {
+			a := fmt.Sprintf("/ip4/192.168.0.%s/tcp/%s",
+				strconv.Itoa(i),
+				strconv.Itoa(60000+j),
+			)
+
+			var err error
+			na, err := network.AddressFromString(a)
+			require.NoError(t, err)
+
+			as[j], err = na.IPAddrString()
+			require.NoError(t, err)
+
+			ni := netmap.NewNodeInfo()
+			ni.SetAddress(a)
+
+			ns[j] = *ni
+		}
+
+		mNodes[i] = netmap.NodesFromInfo(ns)
+		mAddr[i] = as
+	}
+
+	return mNodes, mAddr
+}
+
+func generateChain(ln int, cid *container.ID) ([]*object.RawObject, []*objectSDK.ID, []byte) {
+	curID := generateID()
+	var prevID *objectSDK.ID
+
+	addr := objectSDK.NewAddress()
+	addr.SetContainerID(cid)
+
+	res := make([]*object.RawObject, 0, ln)
+	ids := make([]*objectSDK.ID, 0, ln)
+	payload := make([]byte, 0, ln*10)
+
+	for i := 0; i < ln; i++ {
+		ids = append(ids, curID)
+		addr.SetObjectID(curID)
+
+		payloadPart := make([]byte, 10)
+		rand.Read(payloadPart)
+
+		o := generateObject(addr, prevID, []byte{byte(i)})
+		o.SetPayload(payloadPart)
+		o.SetID(curID)
+
+		payload = append(payload, payloadPart...)
+
+		res = append(res, o)
+
+		prevID = curID
+		curID = generateID()
+	}
+
+	return res, ids, payload
+}
+
+func TestGetRemoteSmall(t *testing.T) {
+	ctx := context.Background()
+
+	cnr := container.New(container.WithPolicy(new(netmap.PlacementPolicy)))
+	cid := container.CalculateID(cnr)
+
+	newSvc := func(b *testPlacementBuilder, c *testClientCache) *Service {
+		svc := &Service{cfg: new(cfg)}
+		svc.log = test.NewLogger(true)
+		svc.localStorage = newTestStorage()
+		svc.assembly = true
+		svc.traverserGenerator = &testTraverserGenerator{
+			c: cnr,
+			b: b,
+		}
+		svc.clientCache = c
+
+		return svc
+	}
+
+	newPrm := func(raw bool, w ObjectWriter) Prm {
+		return Prm{
+			objWriter: w,
+			raw:       raw,
+			common:    new(util.CommonPrm).WithLocalOnly(false),
+		}
+	}
+
+	t.Run("OK", func(t *testing.T) {
+		addr := generateAddress()
+		addr.SetContainerID(cid)
+
+		ns, as := testNodeMatrix(t, []int{2})
+
+		builder := &testPlacementBuilder{
+			vectors: map[string][]netmap.Nodes{
+				addr.String(): ns,
+			},
+		}
+
+		obj := generateObject(addr, nil, nil)
+
+		c1 := newTestClient()
+		c1.addResult(addr, obj, nil)
+
+		c2 := newTestClient()
+		c2.addResult(addr, nil, errors.New("any error"))
+
+		svc := newSvc(builder, &testClientCache{
+			clients: map[string]*testClient{
+				as[0][0]: c1,
+				as[0][1]: c2,
+			},
+		})
+
+		w := newSimpleObjectWriter()
+
+		p := newPrm(false, w)
+		p.addr = addr
+
+		err := svc.Get(ctx, p)
+		require.NoError(t, err)
+		require.Equal(t, obj.Object(), w.object())
+
+		*c1, *c2 = *c2, *c1
+
+		err = svc.Get(ctx, p)
+		require.NoError(t, err)
+		require.Equal(t, obj.Object(), w.object())
+	})
+
+	t.Run("INHUMED", func(t *testing.T) {
+		addr := generateAddress()
+		addr.SetContainerID(cid)
+
+		ns, as := testNodeMatrix(t, []int{2})
+
+		builder := &testPlacementBuilder{
+			vectors: map[string][]netmap.Nodes{
+				addr.String(): ns,
+			},
+		}
+
+		c1 := newTestClient()
+		c1.addResult(addr, nil, errors.New("any error"))
+
+		c2 := newTestClient()
+		c2.addResult(addr, nil, object.ErrAlreadyRemoved)
+
+		svc := newSvc(builder, &testClientCache{
+			clients: map[string]*testClient{
+				as[0][0]: c1,
+				as[0][1]: c2,
+			},
+		})
+
+		p := newPrm(false, nil)
+		p.addr = addr
+
+		err := svc.Get(ctx, p)
+		require.True(t, errors.Is(err, object.ErrAlreadyRemoved))
+	})
+
+	t.Run("404", func(t *testing.T) {
+		addr := generateAddress()
+		addr.SetContainerID(cid)
+
+		ns, as := testNodeMatrix(t, []int{2})
+
+		builder := &testPlacementBuilder{
+			vectors: map[string][]netmap.Nodes{
+				addr.String(): ns,
+			},
+		}
+
+		c1 := newTestClient()
+		c1.addResult(addr, nil, errors.New("any error"))
+
+		c2 := newTestClient()
+		c2.addResult(addr, nil, errors.New("any error"))
+
+		svc := newSvc(builder, &testClientCache{
+			clients: map[string]*testClient{
+				as[0][0]: c1,
+				as[0][1]: c2,
+			},
+		})
+
+		p := newPrm(false, nil)
+		p.addr = addr
+
+		err := svc.Get(ctx, p)
+		require.True(t, errors.Is(err, object.ErrNotFound))
+	})
+
+	t.Run("VIRTUAL", func(t *testing.T) {
+		t.Run("linking", func(t *testing.T) {
+			t.Run("get linking failure", func(t *testing.T) {
+				addr := generateAddress()
+				addr.SetContainerID(cid)
+				addr.SetObjectID(generateID())
+
+				ns, as := testNodeMatrix(t, []int{2})
+
+				splitInfo := objectSDK.NewSplitInfo()
+				splitInfo.SetLink(generateID())
+
+				splitAddr := objectSDK.NewAddress()
+				splitAddr.SetContainerID(cid)
+				splitAddr.SetObjectID(splitInfo.Link())
+
+				c1 := newTestClient()
+				c1.addResult(addr, nil, errors.New("any error"))
+				c1.addResult(splitAddr, nil, object.ErrNotFound)
+
+				c2 := newTestClient()
+				c2.addResult(addr, nil, objectSDK.NewSplitInfoError(splitInfo))
+				c2.addResult(splitAddr, nil, object.ErrNotFound)
+
+				builder := &testPlacementBuilder{
+					vectors: map[string][]netmap.Nodes{
+						addr.String():      ns,
+						splitAddr.String(): ns,
+					},
+				}
+
+				svc := newSvc(builder, &testClientCache{
+					clients: map[string]*testClient{
+						as[0][0]: c1,
+						as[0][1]: c2,
+					},
+				})
+
+				p := newPrm(false, nil)
+				p.addr = addr
+
+				err := svc.Get(ctx, p)
+				require.True(t, errors.Is(err, object.ErrNotFound))
+			})
+
+			t.Run("get chain element failure", func(t *testing.T) {
+				addr := generateAddress()
+				addr.SetContainerID(cid)
+				addr.SetObjectID(generateID())
+
+				srcObj := generateObject(addr, nil, nil)
+
+				ns, as := testNodeMatrix(t, []int{2})
+
+				splitInfo := objectSDK.NewSplitInfo()
+				splitInfo.SetLink(generateID())
+
+				children, childIDs, _ := generateChain(2, cid)
+
+				linkAddr := objectSDK.NewAddress()
+				linkAddr.SetContainerID(cid)
+				linkAddr.SetObjectID(splitInfo.Link())
+
+				linkingObj := generateObject(linkAddr, nil, nil, childIDs...)
+				linkingObj.SetParentID(addr.ObjectID())
+				linkingObj.SetParent(srcObj.Object().SDK())
+
+				child1Addr := objectSDK.NewAddress()
+				child1Addr.SetContainerID(cid)
+				child1Addr.SetObjectID(childIDs[0])
+
+				child2Addr := objectSDK.NewAddress()
+				child2Addr.SetContainerID(cid)
+				child2Addr.SetObjectID(childIDs[1])
+
+				c1 := newTestClient()
+				c1.addResult(addr, nil, errors.New("any error"))
+				c1.addResult(linkAddr, nil, errors.New("any error"))
+				c1.addResult(child1Addr, nil, errors.New("any error"))
+				c1.addResult(child2Addr, nil, errors.New("any error"))
+
+				c2 := newTestClient()
+				c2.addResult(addr, nil, objectSDK.NewSplitInfoError(splitInfo))
+				c2.addResult(linkAddr, linkingObj, nil)
+				c2.addResult(child1Addr, children[0], nil)
+				c2.addResult(child2Addr, nil, errors.New("any error"))
+
+				builder := &testPlacementBuilder{
+					vectors: map[string][]netmap.Nodes{
+						addr.String():       ns,
+						linkAddr.String():   ns,
+						child1Addr.String(): ns,
+						child2Addr.String(): ns,
+					},
+				}
+
+				svc := newSvc(builder, &testClientCache{
+					clients: map[string]*testClient{
+						as[0][0]: c1,
+						as[0][1]: c2,
+					},
+				})
+
+				p := newPrm(false, newSimpleObjectWriter())
+				p.addr = addr
+
+				err := svc.Get(ctx, p)
+				require.True(t, errors.Is(err, object.ErrNotFound))
+			})
+
+			t.Run("OK", func(t *testing.T) {
+				addr := generateAddress()
+				addr.SetContainerID(cid)
+				addr.SetObjectID(generateID())
+
+				srcObj := generateObject(addr, nil, nil)
+
+				ns, as := testNodeMatrix(t, []int{2})
+
+				splitInfo := objectSDK.NewSplitInfo()
+				splitInfo.SetLink(generateID())
+
+				children, childIDs, payload := generateChain(2, cid)
+				srcObj.SetPayload(payload)
+
+				linkAddr := objectSDK.NewAddress()
+				linkAddr.SetContainerID(cid)
+				linkAddr.SetObjectID(splitInfo.Link())
+
+				linkingObj := generateObject(linkAddr, nil, nil, childIDs...)
+				linkingObj.SetParentID(addr.ObjectID())
+				linkingObj.SetParent(srcObj.Object().SDK())
+
+				child1Addr := objectSDK.NewAddress()
+				child1Addr.SetContainerID(cid)
+				child1Addr.SetObjectID(childIDs[0])
+
+				child2Addr := objectSDK.NewAddress()
+				child2Addr.SetContainerID(cid)
+				child2Addr.SetObjectID(childIDs[1])
+
+				c1 := newTestClient()
+				c1.addResult(addr, nil, errors.New("any error"))
+				c1.addResult(linkAddr, nil, errors.New("any error"))
+				c1.addResult(child1Addr, nil, errors.New("any error"))
+				c1.addResult(child2Addr, nil, errors.New("any error"))
+
+				c2 := newTestClient()
+				c2.addResult(addr, nil, objectSDK.NewSplitInfoError(splitInfo))
+				c2.addResult(linkAddr, linkingObj, nil)
+				c2.addResult(child1Addr, children[0], nil)
+				c2.addResult(child2Addr, children[1], nil)
+
+				builder := &testPlacementBuilder{
+					vectors: map[string][]netmap.Nodes{
+						addr.String():       ns,
+						linkAddr.String():   ns,
+						child1Addr.String(): ns,
+						child2Addr.String(): ns,
+					},
+				}
+
+				svc := newSvc(builder, &testClientCache{
+					clients: map[string]*testClient{
+						as[0][0]: c1,
+						as[0][1]: c2,
+					},
+				})
+
+				w := newSimpleObjectWriter()
+
+				p := newPrm(false, w)
+				p.addr = addr
+
+				err := svc.Get(ctx, p)
+				require.NoError(t, err)
+				require.Equal(t, srcObj.Object(), w.object())
+			})
+		})
+
+		t.Run("right child", func(t *testing.T) {
+			t.Run("get right child failure", func(t *testing.T) {
+				addr := generateAddress()
+				addr.SetContainerID(cid)
+				addr.SetObjectID(generateID())
+
+				ns, as := testNodeMatrix(t, []int{2})
+
+				splitInfo := objectSDK.NewSplitInfo()
+				splitInfo.SetLastPart(generateID())
+
+				splitAddr := objectSDK.NewAddress()
+				splitAddr.SetContainerID(cid)
+				splitAddr.SetObjectID(splitInfo.LastPart())
+
+				c1 := newTestClient()
+				c1.addResult(addr, nil, errors.New("any error"))
+				c1.addResult(splitAddr, nil, object.ErrNotFound)
+
+				c2 := newTestClient()
+				c2.addResult(addr, nil, objectSDK.NewSplitInfoError(splitInfo))
+				c2.addResult(splitAddr, nil, object.ErrNotFound)
+
+				builder := &testPlacementBuilder{
+					vectors: map[string][]netmap.Nodes{
+						addr.String():      ns,
+						splitAddr.String(): ns,
+					},
+				}
+
+				svc := newSvc(builder, &testClientCache{
+					clients: map[string]*testClient{
+						as[0][0]: c1,
+						as[0][1]: c2,
+					},
+				})
+
+				p := newPrm(false, nil)
+				p.addr = addr
+
+				err := svc.Get(ctx, p)
+				require.True(t, errors.Is(err, object.ErrNotFound))
+			})
+
+			t.Run("get chain element failure", func(t *testing.T) {
+				addr := generateAddress()
+				addr.SetContainerID(cid)
+				addr.SetObjectID(generateID())
+
+				srcObj := generateObject(addr, nil, nil)
+
+				ns, as := testNodeMatrix(t, []int{2})
+
+				splitInfo := objectSDK.NewSplitInfo()
+				splitInfo.SetLastPart(generateID())
+
+				children, _, _ := generateChain(2, cid)
+
+				rightAddr := objectSDK.NewAddress()
+				rightAddr.SetContainerID(cid)
+				rightAddr.SetObjectID(splitInfo.LastPart())
+
+				rightObj := children[len(children)-1]
+
+				rightObj.SetParentID(addr.ObjectID())
+				rightObj.SetParent(srcObj.Object().SDK())
+
+				preRightAddr := children[len(children)-2].Object().Address()
+
+				c1 := newTestClient()
+				c1.addResult(addr, nil, errors.New("any error"))
+				c1.addResult(rightAddr, nil, errors.New("any error"))
+
+				c2 := newTestClient()
+				c2.addResult(addr, nil, objectSDK.NewSplitInfoError(splitInfo))
+				c2.addResult(rightAddr, rightObj, nil)
+
+				builder := &testPlacementBuilder{
+					vectors: map[string][]netmap.Nodes{
+						addr.String():         ns,
+						rightAddr.String():    ns,
+						preRightAddr.String(): ns,
+						preRightAddr.String(): ns,
+					},
+				}
+
+				svc := newSvc(builder, &testClientCache{
+					clients: map[string]*testClient{
+						as[0][0]: c1,
+						as[0][1]: c2,
+					},
+				})
+
+				headSvc := newTestClient()
+				headSvc.addResult(preRightAddr, nil, object.ErrNotFound)
+				svc.headSvc = headSvc
+
+				p := newPrm(false, newSimpleObjectWriter())
+				p.addr = addr
+
+				err := svc.Get(ctx, p)
+				require.True(t, errors.Is(err, object.ErrNotFound))
+			})
+
+			t.Run("OK", func(t *testing.T) {
+				addr := generateAddress()
+				addr.SetContainerID(cid)
+				addr.SetObjectID(generateID())
+
+				srcObj := generateObject(addr, nil, nil)
+
+				ns, as := testNodeMatrix(t, []int{2})
+
+				splitInfo := objectSDK.NewSplitInfo()
+				splitInfo.SetLastPart(generateID())
+
+				children, _, payload := generateChain(2, cid)
+				srcObj.SetPayload(payload)
+
+				rightObj := children[len(children)-1]
+
+				rightObj.SetID(splitInfo.LastPart())
+				rightObj.SetParentID(addr.ObjectID())
+				rightObj.SetParent(srcObj.Object().SDK())
+
+				c1 := newTestClient()
+				c1.addResult(addr, nil, errors.New("any error"))
+
+				for i := range children {
+					c1.addResult(children[i].Object().Address(), nil, errors.New("any error"))
+				}
+
+				c2 := newTestClient()
+				c2.addResult(addr, nil, objectSDK.NewSplitInfoError(splitInfo))
+
+				for i := range children {
+					c2.addResult(children[i].Object().Address(), children[i], nil)
+				}
+
+				builder := &testPlacementBuilder{
+					vectors: map[string][]netmap.Nodes{},
+				}
+
+				builder.vectors[addr.String()] = ns
+
+				for i := range children {
+					builder.vectors[children[i].Object().Address().String()] = ns
+				}
+
+				svc := newSvc(builder, &testClientCache{
+					clients: map[string]*testClient{
+						as[0][0]: c1,
+						as[0][1]: c2,
+					},
+				})
+
+				svc.headSvc = c2
+
+				w := newSimpleObjectWriter()
+
+				p := newPrm(false, w)
+				p.addr = addr
+
+				err := svc.Get(ctx, p)
+				require.NoError(t, err)
+				require.Equal(t, srcObj.Object(), w.object())
+			})
+		})
+	})
+}

pkg/services/object/get/local.go

@@ -0,0 +1,37 @@
+package getsvc
+
+import (
+	objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
+	"github.com/nspcc-dev/neofs-node/pkg/core/object"
+	"github.com/pkg/errors"
+	"go.uber.org/zap"
+)
+
+func (exec *execCtx) executeLocal() {
+	var err error
+
+	exec.collectedObject, err = exec.svc.localStorage.Get(exec.address())
+
+	var errSplitInfo *objectSDK.SplitInfoError
+
+	switch {
+	default:
+		exec.status = statusUndefined
+		exec.err = err
+
+		exec.log.Debug("local get failed",
+			zap.String("error", err.Error()),
+		)
+	case err == nil:
+		exec.status = statusOK
+		exec.err = nil
+		exec.writeCollectedObject()
+	case errors.Is(err, object.ErrAlreadyRemoved):
+		exec.status = statusINHUMED
+		exec.err = object.ErrAlreadyRemoved
+	case errors.As(err, &errSplitInfo):
+		exec.status = statusVIRTUAL
+		mergeSplitInfo(exec.splitInfo(), errSplitInfo.SplitInfo())
+		exec.err = objectSDK.NewSplitInfoError(exec.infoSplit)
+	}
+}

pkg/services/object/get/prm.go

@@ -1,30 +1,59 @@
 package getsvc
 
 import (
-	"github.com/nspcc-dev/neofs-api-go/pkg/object"
+	"crypto/ecdsa"
+
+	"github.com/nspcc-dev/neofs-api-go/pkg/client"
+	objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
+	"github.com/nspcc-dev/neofs-node/pkg/core/object"
 	"github.com/nspcc-dev/neofs-node/pkg/services/object/util"
 )
 
+// Prm groups parameters of Get service call.
 type Prm struct {
+	objWriter ObjectWriter
+
+	// TODO: replace key and callOpts to CommonPrm
+	key *ecdsa.PrivateKey
+
+	callOpts []client.CallOption
+
 	common *util.CommonPrm
 
-	full bool
+	// TODO: use parameters from NeoFS SDK
+	addr *objectSDK.Address
 
-	addr *object.Address
+	raw bool
 }
 
-func (p *Prm) WithCommonPrm(v *util.CommonPrm) *Prm {
+// ObjectWriter is an interface of target component to write object.
-	if p != nil {
+type ObjectWriter interface {
-		p.common = v
+	WriteHeader(*object.Object) error
-	}
+	WriteChunk([]byte) error
-
-	return p
 }
 
-func (p *Prm) WithAddress(v *object.Address) *Prm {
+// SetObjectWriter sets target component to write the object.
-	if p != nil {
+func (p *Prm) SetObjectWriter(w ObjectWriter) {
-		p.addr = v
+	p.objWriter = w
-	}
+}
-
+
-	return p
+// SetPrivateKey sets private key to use during execution.
+func (p *Prm) SetPrivateKey(key *ecdsa.PrivateKey) {
+	p.key = key
+}
+
+// SetRemoteCallOptions sets call options remote remote client calls.
+func (p *Prm) SetRemoteCallOptions(opts ...client.CallOption) {
+	p.callOpts = opts
+}
+
+// SetAddress sets address of the requested object.
+func (p *Prm) SetAddress(addr *objectSDK.Address) {
+	p.addr = addr
+}
+
+// SetRaw sets raw flag. If flag is set,
+// object assembling will not be undertaken.
+func (p *Prm) SetRaw(raw bool) {
+	p.raw = raw
 }

pkg/services/object/get/remote.go

@@ -0,0 +1,50 @@
+package getsvc
+
+import (
+	"context"
+
+	objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
+	"github.com/nspcc-dev/neofs-node/pkg/core/object"
+	"github.com/nspcc-dev/neofs-node/pkg/network"
+	"github.com/pkg/errors"
+	"go.uber.org/zap"
+)
+
+func (exec *execCtx) processNode(ctx context.Context, addr *network.Address) bool {
+	log := exec.log.With(zap.Stringer("remote node", addr))
+
+	log.Debug("processing node...")
+
+	client, ok := exec.remoteClient(addr)
+	if !ok {
+		return true
+	}
+
+	obj, err := client.GetObject(ctx, exec.prm)
+
+	var errSplitInfo *objectSDK.SplitInfoError
+
+	switch {
+	default:
+		exec.status = statusUndefined
+		exec.err = object.ErrNotFound
+
+		log.Debug("remote call failed",
+			zap.String("error", err.Error()),
+		)
+	case err == nil:
+		exec.status = statusOK
+		exec.err = nil
+		exec.collectedObject = object.NewFromSDK(obj)
+		exec.writeCollectedObject()
+	case errors.Is(err, object.ErrAlreadyRemoved):
+		exec.status = statusINHUMED
+		exec.err = object.ErrAlreadyRemoved
+	case errors.As(err, &errSplitInfo):
+		exec.status = statusVIRTUAL
+		mergeSplitInfo(exec.splitInfo(), errSplitInfo.SplitInfo())
+		exec.err = objectSDK.NewSplitInfoError(exec.infoSplit)
+	}
+
+	return exec.status != statusUndefined
+}

pkg/services/object/get/service.go

@@ -2,26 +2,67 @@ package getsvc
 
 import (
 	"context"
+	"crypto/ecdsa"
 
-	rangesvc "github.com/nspcc-dev/neofs-node/pkg/services/object/range"
+	"github.com/nspcc-dev/neofs-api-go/pkg/client"
-	"github.com/pkg/errors"
+	objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
+	"github.com/nspcc-dev/neofs-node/pkg/core/object"
+	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/engine"
+	"github.com/nspcc-dev/neofs-node/pkg/network/cache"
+	headsvc "github.com/nspcc-dev/neofs-node/pkg/services/object/head"
+	"github.com/nspcc-dev/neofs-node/pkg/services/object/util"
+	"github.com/nspcc-dev/neofs-node/pkg/services/object_manager/placement"
+	"github.com/nspcc-dev/neofs-node/pkg/util/logger"
+	"go.uber.org/zap"
 )
 
+// Service utility serving requests of Object.Get service.
 type Service struct {
 	*cfg
 }
 
+// Option is a Service's constructor option.
 type Option func(*cfg)
 
+type getClient interface {
+	GetObject(context.Context, Prm) (*objectSDK.Object, error)
+}
+
 type cfg struct {
-	rngSvc *rangesvc.Service
+	assembly bool
+
+	log *logger.Logger
+
+	headSvc interface {
+		head(context.Context, Prm) (*object.Object, error)
+	}
+
+	localStorage interface {
+		Get(*objectSDK.Address) (*object.Object, error)
+	}
+
+	clientCache interface {
+		get(*ecdsa.PrivateKey, string) (getClient, error)
+	}
+
+	traverserGenerator interface {
+		GenerateTraverser(*objectSDK.Address) (*placement.Traverser, error)
+	}
 }
 
 func defaultCfg() *cfg {
-	return new(cfg)
+	return &cfg{
+		assembly:     true,
+		log:          zap.L(),
+		headSvc:      new(headSvcWrapper),
+		localStorage: new(storageEngineWrapper),
+		clientCache:  new(clientCacheWrapper),
+	}
 }
 
-func NewService(opts ...Option) *Service {
+// New creates, initializes and returns utility serving
+// Object.Get service requests.
+func New(opts ...Option) *Service {
 	c := defaultCfg()
 
 	for i := range opts {
@@ -33,23 +74,53 @@ func NewService(opts ...Option) *Service {
 	}
 }
 
-func (s *Service) Get(ctx context.Context, prm *Prm) (*Streamer, error) {
+// WithLogger returns option to specify Get service's logger.
-	r, err := s.rngSvc.GetRange(ctx, new(rangesvc.Prm).
+func WithLogger(l *logger.Logger) Option {
-		WithAddress(prm.addr).
-		FullRange().
-		WithCommonPrm(prm.common),
-	)
-	if err != nil {
-		return nil, errors.Wrapf(err, "(%T) could not get range", s)
-	}
-
-	return &Streamer{
-		rngRes: r,
-	}, nil
-}
-
-func WithRangeService(v *rangesvc.Service) Option {
 	return func(c *cfg) {
-		c.rngSvc = v
+		c.log = l.With(zap.String("component", "Object.Get service"))
+	}
+}
+
+// WithoutAssembly returns option to disable object assembling.
+func WithoutAssembly() Option {
+	return func(c *cfg) {
+		c.assembly = false
+	}
+}
+
+// WithLocalStorageEngine returns option to set local storage
+// instance.
+func WithLocalStorageEngine(e *engine.StorageEngine) Option {
+	return func(c *cfg) {
+		c.localStorage.(*storageEngineWrapper).engine = e
+	}
+}
+
+// WithClientCache returns option to set cache of remote node clients.
+func WithClientCache(v *cache.ClientCache) Option {
+	return func(c *cfg) {
+		c.clientCache.(*clientCacheWrapper).cache = v
+	}
+}
+
+// WithClientOptions returns option to specify options of remote node clients.
+func WithClientOptions(opts ...client.Option) Option {
+	return func(c *cfg) {
+		c.clientCache.(*clientCacheWrapper).opts = opts
+	}
+}
+
+// WithTraverserGenerator returns option to set generator of
+// placement traverser to get the objects from containers.
+func WithTraverserGenerator(t *util.TraverserGenerator) Option {
+	return func(c *cfg) {
+		c.traverserGenerator = t
+	}
+}
+
+// WithHeadService returns option to set the utility serving object.Head.
+func WithHeadService(svc *headsvc.Service) Option {
+	return func(c *cfg) {
+		c.headSvc.(*headSvcWrapper).svc = svc
 	}
 }

pkg/services/object/get/streamer.go

@@ -1,26 +0,0 @@
-package getsvc
-
-import (
-	rangesvc "github.com/nspcc-dev/neofs-node/pkg/services/object/range"
-	"github.com/pkg/errors"
-)
-
-type Streamer struct {
-	headSent bool
-
-	rngRes *rangesvc.Result
-}
-
-func (p *Streamer) Recv() (interface{}, error) {
-	if !p.headSent {
-		p.headSent = true
-		return p.rngRes.Head(), nil
-	}
-
-	rngResp, err := p.rngRes.Stream().Recv()
-	if err != nil {
-		return nil, errors.Wrapf(err, "(%T) could not receive range response", p)
-	}
-
-	return rngResp.PayloadChunk(), nil
-}

pkg/services/object/get/util.go

@@ -0,0 +1,110 @@
+package getsvc
+
+import (
+	"context"
+	"crypto/ecdsa"
+
+	"github.com/nspcc-dev/neofs-api-go/pkg/client"
+	objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
+	"github.com/nspcc-dev/neofs-node/pkg/core/object"
+	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/engine"
+	"github.com/nspcc-dev/neofs-node/pkg/network/cache"
+	headsvc "github.com/nspcc-dev/neofs-node/pkg/services/object/head"
+)
+
+type simpleObjectWriter struct {
+	obj *object.RawObject
+
+	payload []byte
+}
+
+type clientCacheWrapper struct {
+	cache *cache.ClientCache
+
+	opts []client.Option
+}
+
+type clientWrapper struct {
+	client *client.Client
+}
+
+type storageEngineWrapper struct {
+	engine *engine.StorageEngine
+}
+
+type headSvcWrapper struct {
+	svc *headsvc.Service
+}
+
+func newSimpleObjectWriter() *simpleObjectWriter {
+	return new(simpleObjectWriter)
+}
+
+func (s *simpleObjectWriter) WriteHeader(obj *object.Object) error {
+	s.obj = object.NewRawFromObject(obj)
+
+	s.payload = make([]byte, 0, obj.PayloadSize())
+
+	return nil
+}
+
+func (s *simpleObjectWriter) WriteChunk(p []byte) error {
+	s.payload = append(s.payload, p...)
+	return nil
+}
+
+func (s *simpleObjectWriter) Close() error {
+	return nil
+}
+
+func (s *simpleObjectWriter) object() *object.Object {
+	if len(s.payload) > 0 {
+		s.obj.SetPayload(s.payload)
+	}
+
+	return s.obj.Object()
+}
+
+func (c *clientCacheWrapper) get(key *ecdsa.PrivateKey, addr string) (getClient, error) {
+	clt, err := c.cache.Get(key, addr, c.opts...)
+
+	return &clientWrapper{
+		client: clt,
+	}, err
+}
+
+func (c *clientWrapper) GetObject(ctx context.Context, p Prm) (*objectSDK.Object, error) {
+	// we don't specify payload writer because we accumulate
+	// the object locally (even huge).
+	return c.client.GetObject(ctx,
+		new(client.GetObjectParams).
+			WithAddress(p.addr).
+			WithRawFlag(true),
+		p.callOpts...,
+	)
+}
+
+func (e *storageEngineWrapper) Get(addr *objectSDK.Address) (*object.Object, error) {
+	r, err := e.engine.Get(new(engine.GetPrm).
+		WithAddress(addr),
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	return r.Object(), nil
+}
+
+func (s *headSvcWrapper) head(ctx context.Context, p Prm) (*object.Object, error) {
+	r, err := s.svc.Head(ctx, new(headsvc.Prm).
+		WithAddress(p.addr).
+		WithCommonPrm(p.common).
+		Short(false),
+	)
+
+	if err != nil {
+		return nil, err
+	}
+
+	return r.Header(), nil
+}

pkg/services/object/get/v2/service.go

@@ -1,10 +1,11 @@
 package getsvc
 
 import (
-	"context"
+	"github.com/nspcc-dev/neofs-api-go/pkg/object"
-
 	objectV2 "github.com/nspcc-dev/neofs-api-go/v2/object"
+	objectSvc "github.com/nspcc-dev/neofs-node/pkg/services/object"
 	getsvc "github.com/nspcc-dev/neofs-node/pkg/services/object/get"
+	objutil "github.com/nspcc-dev/neofs-node/pkg/services/object/util"
 	"github.com/pkg/errors"
 )
 
@@ -18,6 +19,8 @@ type Option func(*cfg)
 
 type cfg struct {
 	svc *getsvc.Service
+
+	keyStorage *objutil.KeyStorage
 }
 
 // NewService constructs Service instance from provided options.
@@ -34,13 +37,22 @@ func NewService(opts ...Option) *Service {
 }
 
 // Get calls internal service and returns v2 object stream.
-func (s *Service) Get(ctx context.Context, req *objectV2.GetRequest) (objectV2.GetObjectStreamer, error) {
+func (s *Service) Get(req *objectV2.GetRequest, stream objectSvc.GetObjectStream) error {
-	stream, err := s.svc.Get(ctx, toPrm(req))
+	p, err := s.toPrm(req, stream)
 	if err != nil {
-		return nil, errors.Wrapf(err, "(%T) could not get object payload range data", s)
+		return err
 	}
 
-	return fromResponse(stream), nil
+	err = s.svc.Get(stream.Context(), *p)
+
+	var splitErr *object.SplitInfoError
+
+	switch {
+	case errors.As(err, &splitErr):
+		return stream.Send(splitInfoResponse(splitErr.SplitInfo()))
+	default:
+		return err
+	}
 }
 
 func WithInternalService(v *getsvc.Service) Option {
@@ -48,3 +60,10 @@ func WithInternalService(v *getsvc.Service) Option {
 		c.svc = v
 	}
 }
+
+// WithKeyStorage returns option to set local private key storage.
+func WithKeyStorage(ks *objutil.KeyStorage) Option {
+	return func(c *cfg) {
+		c.keyStorage = ks
+	}
+}

pkg/services/object/get/v2/streamer.go

@@ -1,47 +1,40 @@
 package getsvc
 
 import (
-	"fmt"
-
 	objectV2 "github.com/nspcc-dev/neofs-api-go/v2/object"
 	"github.com/nspcc-dev/neofs-node/pkg/core/object"
-	getsvc "github.com/nspcc-dev/neofs-node/pkg/services/object/get"
+	objectSvc "github.com/nspcc-dev/neofs-node/pkg/services/object"
-	"github.com/pkg/errors"
 )
 
-type streamer struct {
+type streamObjectWriter struct {
-	stream *getsvc.Streamer
+	objectSvc.GetObjectStream
-
-	body *objectV2.GetResponseBody
 }
 
-func (s *streamer) Recv() (*objectV2.GetResponse, error) {
+func (s *streamObjectWriter) WriteHeader(obj *object.Object) error {
-	r, err := s.stream.Recv()
+	p := new(objectV2.GetObjectPartInit)
-	if err != nil {
-		return nil, errors.Wrapf(err, "(%T) could not receive get response", s)
-	}
 
-	switch v := r.(type) {
+	objV2 := obj.ToV2()
-	case *object.Object:
+	p.SetObjectID(objV2.GetObjectID())
-		oV2 := v.ToV2()
+	p.SetHeader(objV2.GetHeader())
+	p.SetSignature(objV2.GetSignature())
 
-		partInit := new(objectV2.GetObjectPartInit)
+	return s.GetObjectStream.Send(newResponse(p))
-		partInit.SetHeader(oV2.GetHeader())
+}
-		partInit.SetSignature(oV2.GetSignature())
+
-		partInit.SetObjectID(oV2.GetObjectID())
+func (s *streamObjectWriter) WriteChunk(chunk []byte) error {
-
+	p := new(objectV2.GetObjectPartChunk)
-		s.body.SetObjectPart(partInit)
+	p.SetChunk(chunk)
-	case []byte:
+
-		partChunk := new(objectV2.GetObjectPartChunk)
+	return s.GetObjectStream.Send(newResponse(p))
-		partChunk.SetChunk(v)
+}
-
+
-		s.body.SetObjectPart(partChunk)
+func newResponse(p objectV2.GetObjectPart) *objectV2.GetResponse {
-	default:
+	r := new(objectV2.GetResponse)
-		panic(fmt.Sprintf("unexpected response type %T from %T", r, s.stream))
+
-	}
+	body := new(objectV2.GetResponseBody)
-
+	r.SetBody(body)
-	resp := new(objectV2.GetResponse)
+
-	resp.SetBody(s.body)
+	body.SetObjectPart(p)
-
+
-	return resp, nil
+	return r
 }

pkg/services/object/get/v2/util.go

@@ -1,23 +1,62 @@
 package getsvc
 
 import (
+	"github.com/nspcc-dev/neofs-api-go/pkg"
+	"github.com/nspcc-dev/neofs-api-go/pkg/client"
 	"github.com/nspcc-dev/neofs-api-go/pkg/object"
+	"github.com/nspcc-dev/neofs-api-go/pkg/token"
 	objectV2 "github.com/nspcc-dev/neofs-api-go/v2/object"
+	"github.com/nspcc-dev/neofs-api-go/v2/session"
+	objectSvc "github.com/nspcc-dev/neofs-node/pkg/services/object"
 	getsvc "github.com/nspcc-dev/neofs-node/pkg/services/object/get"
-	"github.com/nspcc-dev/neofs-node/pkg/services/object/util"
 )
 
-func toPrm(req *objectV2.GetRequest) *getsvc.Prm {
+func (s *Service) toPrm(req *objectV2.GetRequest, stream objectSvc.GetObjectStream) (*getsvc.Prm, error) {
-	return new(getsvc.Prm).
+	meta := req.GetMetaHeader()
-		WithAddress(
+
-			object.NewAddressFromV2(req.GetBody().GetAddress()),
+	key, err := s.keyStorage.GetKey(token.NewSessionTokenFromV2(meta.GetSessionToken()))
-		).
+	if err != nil {
-		WithCommonPrm(util.CommonPrmFromV2(req))
+		return nil, err
+	}
+
+	p := new(getsvc.Prm)
+	p.SetPrivateKey(key)
+
+	body := req.GetBody()
+	p.SetAddress(object.NewAddressFromV2(body.GetAddress()))
+	p.SetRaw(body.GetRaw())
+	p.SetRemoteCallOptions(remoteCallOptionsFromMeta(meta)...)
+	p.SetObjectWriter(&streamObjectWriter{stream})
+
+	return p, nil
 }
 
-func fromResponse(res *getsvc.Streamer) objectV2.GetObjectStreamer {
+// can be shared accross all services
-	return &streamer{
+func remoteCallOptionsFromMeta(meta *session.RequestMetaHeader) []client.CallOption {
-		stream: res,
+	xHdrs := meta.GetXHeaders()
-		body:   new(objectV2.GetResponseBody),
+
+	opts := make([]client.CallOption, 0, 3+len(xHdrs))
+
+	opts = append(opts,
+		client.WithBearer(token.NewBearerTokenFromV2(meta.GetBearerToken())),
+		client.WithSession(token.NewSessionTokenFromV2(meta.GetSessionToken())),
+		client.WithTTL(meta.GetTTL()-1),
+	)
+
+	for i := range xHdrs {
+		opts = append(opts, client.WithXHeader(pkg.NewXHeaderFromV2(xHdrs[i])))
 	}
+
+	return opts
+}
+
+func splitInfoResponse(info *object.SplitInfo) *objectV2.GetResponse {
+	resp := new(objectV2.GetResponse)
+
+	body := new(objectV2.GetResponseBody)
+	resp.SetBody(body)
+
+	body.SetObjectPart(info.ToV2())
+
+	return resp
 }

pkg/services/object/response.go

@@ -9,10 +9,10 @@ import (
 	"github.com/pkg/errors"
 )
 
-type responseService struct {
+type ResponseService struct {
 	respSvc *response.Service
 
-	svc object.Service
+	svc ServiceServer
 }
 
 type searchStreamResponser struct {
@@ -20,7 +20,9 @@ type searchStreamResponser struct {
 }
 
 type getStreamResponser struct {
-	stream *response.ServerMessageStreamer
+	util.ServerStream
+
+	respWriter util.ResponseMessageWriter
 }
 
 type getRangeStreamResponser struct {
@@ -33,42 +35,24 @@ type putStreamResponser struct {
 
 // NewResponseService returns object service instance that passes internal service
 // call to response service.
-func NewResponseService(objSvc object.Service, respSvc *response.Service) object.Service {
+func NewResponseService(objSvc ServiceServer, respSvc *response.Service) *ResponseService {
-	return &responseService{
+	return &ResponseService{
 		respSvc: respSvc,
 		svc:     objSvc,
 	}
 }
 
-func (s *getStreamResponser) Recv() (*object.GetResponse, error) {
+func (s *getStreamResponser) Send(resp *object.GetResponse) error {
-	r, err := s.stream.Recv()
+	return s.respWriter(resp)
-	if err != nil {
-		return nil, errors.Wrapf(err, "(%T) could not receive response", s)
-	}
-
-	return r.(*object.GetResponse), nil
 }
 
-func (s *responseService) Get(ctx context.Context, req *object.GetRequest) (object.GetObjectStreamer, error) {
+func (s *ResponseService) Get(req *object.GetRequest, stream GetObjectStream) error {
-	stream, err := s.respSvc.HandleServerStreamRequest(ctx, req,
+	return s.svc.Get(req, &getStreamResponser{
-		func(ctx context.Context, req interface{}) (util.ResponseMessageReader, error) {
+		ServerStream: stream,
-			stream, err := s.svc.Get(ctx, req.(*object.GetRequest))
+		respWriter: s.respSvc.HandleServerStreamRequest_(func(resp util.ResponseMessage) error {
-			if err != nil {
+			return stream.Send(resp.(*object.GetResponse))
-				return nil, err
+		}),
-			}
+	})
-
-			return func() (util.ResponseMessage, error) {
-				return stream.Recv()
-			}, nil
-		},
-	)
-	if err != nil {
-		return nil, err
-	}
-
-	return &getStreamResponser{
-		stream: stream,
-	}, nil
 }
 
 func (s *putStreamResponser) Send(req *object.PutRequest) error {
@@ -84,7 +68,7 @@ func (s *putStreamResponser) CloseAndRecv() (*object.PutResponse, error) {
 	return r.(*object.PutResponse), nil
 }
 
-func (s *responseService) Put(ctx context.Context) (object.PutObjectStreamer, error) {
+func (s *ResponseService) Put(ctx context.Context) (object.PutObjectStreamer, error) {
 	stream, err := s.svc.Put(ctx)
 	if err != nil {
 		return nil, errors.Wrap(err, "could not create Put object streamer")
@@ -102,7 +86,7 @@ func (s *responseService) Put(ctx context.Context) (object.PutObjectStreamer, er
 	}, nil
 }
 
-func (s *responseService) Head(ctx context.Context, req *object.HeadRequest) (*object.HeadResponse, error) {
+func (s *ResponseService) Head(ctx context.Context, req *object.HeadRequest) (*object.HeadResponse, error) {
 	resp, err := s.respSvc.HandleUnaryRequest(ctx, req,
 		func(ctx context.Context, req interface{}) (util.ResponseMessage, error) {
 			return s.svc.Head(ctx, req.(*object.HeadRequest))
@@ -124,7 +108,7 @@ func (s *searchStreamResponser) Recv() (*object.SearchResponse, error) {
 	return r.(*object.SearchResponse), nil
 }
 
-func (s *responseService) Search(ctx context.Context, req *object.SearchRequest) (object.SearchObjectStreamer, error) {
+func (s *ResponseService) Search(ctx context.Context, req *object.SearchRequest) (object.SearchObjectStreamer, error) {
 	stream, err := s.respSvc.HandleServerStreamRequest(ctx, req,
 		func(ctx context.Context, req interface{}) (util.ResponseMessageReader, error) {
 			stream, err := s.svc.Search(ctx, req.(*object.SearchRequest))
@@ -146,7 +130,7 @@ func (s *responseService) Search(ctx context.Context, req *object.SearchRequest)
 	}, nil
 }
 
-func (s *responseService) Delete(ctx context.Context, req *object.DeleteRequest) (*object.DeleteResponse, error) {
+func (s *ResponseService) Delete(ctx context.Context, req *object.DeleteRequest) (*object.DeleteResponse, error) {
 	resp, err := s.respSvc.HandleUnaryRequest(ctx, req,
 		func(ctx context.Context, req interface{}) (util.ResponseMessage, error) {
 			return s.svc.Delete(ctx, req.(*object.DeleteRequest))
@@ -168,7 +152,7 @@ func (s *getRangeStreamResponser) Recv() (*object.GetRangeResponse, error) {
 	return r.(*object.GetRangeResponse), nil
 }
 
-func (s *responseService) GetRange(ctx context.Context, req *object.GetRangeRequest) (object.GetRangeObjectStreamer, error) {
+func (s *ResponseService) GetRange(ctx context.Context, req *object.GetRangeRequest) (object.GetRangeObjectStreamer, error) {
 	stream, err := s.respSvc.HandleServerStreamRequest(ctx, req,
 		func(ctx context.Context, req interface{}) (util.ResponseMessageReader, error) {
 			stream, err := s.svc.GetRange(ctx, req.(*object.GetRangeRequest))
@@ -190,7 +174,7 @@ func (s *responseService) GetRange(ctx context.Context, req *object.GetRangeRequ
 	}, nil
 }
 
-func (s *responseService) GetRangeHash(ctx context.Context, req *object.GetRangeHashRequest) (*object.GetRangeHashResponse, error) {
+func (s *ResponseService) GetRangeHash(ctx context.Context, req *object.GetRangeHashRequest) (*object.GetRangeHashResponse, error) {
 	resp, err := s.respSvc.HandleUnaryRequest(ctx, req,
 		func(ctx context.Context, req interface{}) (util.ResponseMessage, error) {
 			return s.svc.GetRangeHash(ctx, req.(*object.GetRangeHashRequest))

pkg/services/object/server.go

@@ -0,0 +1,26 @@
+package object
+
+import (
+	"context"
+
+	"github.com/nspcc-dev/neofs-api-go/v2/object"
+	"github.com/nspcc-dev/neofs-node/pkg/services/util"
+)
+
+// GetObjectStream is an interface of NeoFS API v2 compatible object streamer.
+type GetObjectStream interface {
+	util.ServerStream
+	Send(*object.GetResponse) error
+}
+
+// ServiceServer is an interface of utility
+// serving v2 Object service.
+type ServiceServer interface {
+	Get(*object.GetRequest, GetObjectStream) error
+	Put(context.Context) (object.PutObjectStreamer, error)
+	Head(context.Context, *object.HeadRequest) (*object.HeadResponse, error)
+	Search(context.Context, *object.SearchRequest) (object.SearchObjectStreamer, error)
+	Delete(context.Context, *object.DeleteRequest) (*object.DeleteResponse, error)
+	GetRange(context.Context, *object.GetRangeRequest) (object.GetRangeObjectStreamer, error)
+	GetRangeHash(context.Context, *object.GetRangeHashRequest) (*object.GetRangeHashResponse, error)
+}

pkg/services/object/sign.go

@@ -9,12 +9,12 @@ import (
 	"github.com/pkg/errors"
 )
 
-type signService struct {
+type SignService struct {
 	key *ecdsa.PrivateKey
 
 	sigSvc *util.SignService
 
-	svc object.Service
+	svc ServiceServer
 }
 
 type searchStreamSigner struct {
@@ -22,7 +22,9 @@ type searchStreamSigner struct {
 }
 
 type getStreamSigner struct {
-	stream *util.ResponseMessageStreamer
+	util.ServerStream
+
+	respWriter util.ResponseMessageWriter
 }
 
 type putStreamSigner struct {
@@ -33,43 +35,32 @@ type getRangeStreamSigner struct {
 	stream *util.ResponseMessageStreamer
 }
 
-func NewSignService(key *ecdsa.PrivateKey, svc object.Service) object.Service {
+func NewSignService(key *ecdsa.PrivateKey, svc ServiceServer) *SignService {
-	return &signService{
+	return &SignService{
 		key:    key,
 		sigSvc: util.NewUnarySignService(key),
 		svc:    svc,
 	}
 }
 
-func (s *getStreamSigner) Recv() (*object.GetResponse, error) {
+func (s *getStreamSigner) Send(resp *object.GetResponse) error {
-	r, err := s.stream.Recv()
+	return s.respWriter(resp)
-	if err != nil {
-		return nil, errors.Wrap(err, "could not receive response")
-	}
-
-	return r.(*object.GetResponse), nil
 }
 
-func (s *signService) Get(ctx context.Context, req *object.GetRequest) (object.GetObjectStreamer, error) {
+func (s *SignService) Get(req *object.GetRequest, stream GetObjectStream) error {
-	stream, err := s.sigSvc.HandleServerStreamRequest(ctx, req,
+	respWriter, err := s.sigSvc.HandleServerStreamRequest_(req,
-		func(ctx context.Context, req interface{}) (util.ResponseMessageReader, error) {
+		func(resp util.ResponseMessage) error {
-			stream, err := s.svc.Get(ctx, req.(*object.GetRequest))
+			return stream.Send(resp.(*object.GetResponse))
-			if err != nil {
-				return nil, err
-			}
-
-			return func() (util.ResponseMessage, error) {
-				return stream.Recv()
-			}, nil
 		},
 	)
 	if err != nil {
-		return nil, err
+		return err
 	}
 
-	return &getStreamSigner{
+	return s.svc.Get(req, &getStreamSigner{
-		stream: stream,
+		ServerStream: stream,
-	}, nil
+		respWriter:   respWriter,
+	})
 }
 
 func (s *putStreamSigner) Send(req *object.PutRequest) error {
@@ -85,7 +76,7 @@ func (s *putStreamSigner) CloseAndRecv() (*object.PutResponse, error) {
 	return r.(*object.PutResponse), nil
 }
 
-func (s *signService) Put(ctx context.Context) (object.PutObjectStreamer, error) {
+func (s *SignService) Put(ctx context.Context) (object.PutObjectStreamer, error) {
 	stream, err := s.svc.Put(ctx)
 	if err != nil {
 		return nil, errors.Wrap(err, "could not create Put object streamer")
@@ -103,7 +94,7 @@ func (s *signService) Put(ctx context.Context) (object.PutObjectStreamer, error)
 	}, nil
 }
 
-func (s *signService) Head(ctx context.Context, req *object.HeadRequest) (*object.HeadResponse, error) {
+func (s *SignService) Head(ctx context.Context, req *object.HeadRequest) (*object.HeadResponse, error) {
 	resp, err := s.sigSvc.HandleUnaryRequest(ctx, req,
 		func(ctx context.Context, req interface{}) (util.ResponseMessage, error) {
 			return s.svc.Head(ctx, req.(*object.HeadRequest))
@@ -125,7 +116,7 @@ func (s *searchStreamSigner) Recv() (*object.SearchResponse, error) {
 	return r.(*object.SearchResponse), nil
 }
 
-func (s *signService) Search(ctx context.Context, req *object.SearchRequest) (object.SearchObjectStreamer, error) {
+func (s *SignService) Search(ctx context.Context, req *object.SearchRequest) (object.SearchObjectStreamer, error) {
 	stream, err := s.sigSvc.HandleServerStreamRequest(ctx, req,
 		func(ctx context.Context, req interface{}) (util.ResponseMessageReader, error) {
 			stream, err := s.svc.Search(ctx, req.(*object.SearchRequest))
@@ -147,7 +138,7 @@ func (s *signService) Search(ctx context.Context, req *object.SearchRequest) (ob
 	}, nil
 }
 
-func (s *signService) Delete(ctx context.Context, req *object.DeleteRequest) (*object.DeleteResponse, error) {
+func (s *SignService) Delete(ctx context.Context, req *object.DeleteRequest) (*object.DeleteResponse, error) {
 	resp, err := s.sigSvc.HandleUnaryRequest(ctx, req,
 		func(ctx context.Context, req interface{}) (util.ResponseMessage, error) {
 			return s.svc.Delete(ctx, req.(*object.DeleteRequest))
@@ -169,7 +160,7 @@ func (s *getRangeStreamSigner) Recv() (*object.GetRangeResponse, error) {
 	return r.(*object.GetRangeResponse), nil
 }
 
-func (s *signService) GetRange(ctx context.Context, req *object.GetRangeRequest) (object.GetRangeObjectStreamer, error) {
+func (s *SignService) GetRange(ctx context.Context, req *object.GetRangeRequest) (object.GetRangeObjectStreamer, error) {
 	stream, err := s.sigSvc.HandleServerStreamRequest(ctx, req,
 		func(ctx context.Context, req interface{}) (util.ResponseMessageReader, error) {
 			stream, err := s.svc.GetRange(ctx, req.(*object.GetRangeRequest))
@@ -191,7 +182,7 @@ func (s *signService) GetRange(ctx context.Context, req *object.GetRangeRequest)
 	}, nil
 }
 
-func (s *signService) GetRangeHash(ctx context.Context, req *object.GetRangeHashRequest) (*object.GetRangeHashResponse, error) {
+func (s *SignService) GetRangeHash(ctx context.Context, req *object.GetRangeHashRequest) (*object.GetRangeHashResponse, error) {
 	resp, err := s.sigSvc.HandleUnaryRequest(ctx, req,
 		func(ctx context.Context, req interface{}) (util.ResponseMessage, error) {
 			return s.svc.GetRangeHash(ctx, req.(*object.GetRangeHashRequest))

pkg/services/object/transport_splitter.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/nspcc-dev/neofs-api-go/v2/object"
 	"github.com/nspcc-dev/neofs-api-go/v2/refs"
+	"github.com/nspcc-dev/neofs-node/pkg/services/util"
 	"github.com/pkg/errors"
 )
 
@@ -15,16 +16,17 @@ var (
 
 type (
 	TransportSplitter struct {
-		next object.Service
+		next ServiceServer
 
 		chunkSize  uint64
 		addrAmount uint64
 	}
 
-	getStreamBasicChecker struct {
+	getStreamMsgSizeCtrl struct {
-		next      object.GetObjectStreamer
+		util.ServerStream
-		buf       *bytes.Buffer
+
-		resp      *object.GetResponse
+		stream GetObjectStream
+
 		chunkSize int
 	}
 
@@ -43,7 +45,37 @@ type (
 	}
 )
 
-func NewTransportSplitter(size, amount uint64, next object.Service) *TransportSplitter {
+func (s *getStreamMsgSizeCtrl) Send(resp *object.GetResponse) error {
+	body := resp.GetBody()
+
+	part := body.GetObjectPart()
+
+	chunkPart, ok := part.(*object.GetObjectPartChunk)
+	if !ok {
+		return s.stream.Send(resp)
+	}
+
+	var newResp *object.GetResponse
+
+	for buf := bytes.NewBuffer(chunkPart.GetChunk()); buf.Len() > 0; {
+		if newResp == nil {
+			newResp = new(object.GetResponse)
+			newResp.SetBody(body)
+		}
+
+		chunkPart.SetChunk(buf.Next(s.chunkSize))
+		newResp.SetMetaHeader(resp.GetMetaHeader())
+		newResp.SetVerificationHeader(resp.GetVerificationHeader())
+
+		if err := s.stream.Send(newResp); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func NewTransportSplitter(size, amount uint64, next ServiceServer) *TransportSplitter {
 	return &TransportSplitter{
 		next:       next,
 		chunkSize:  size,
@@ -51,13 +83,12 @@ func NewTransportSplitter(size, amount uint64, next object.Service) *TransportSp
 	}
 }
 
-func (c TransportSplitter) Get(ctx context.Context, request *object.GetRequest) (object.GetObjectStreamer, error) {
+func (c *TransportSplitter) Get(req *object.GetRequest, stream GetObjectStream) error {
-	stream, err := c.next.Get(ctx, request)
+	return c.next.Get(req, &getStreamMsgSizeCtrl{
-
+		ServerStream: stream,
-	return &getStreamBasicChecker{
+		stream:       stream,
-		next:      stream,
 		chunkSize:    int(c.chunkSize),
-	}, err
+	})
 }
 
 func (c TransportSplitter) Put(ctx context.Context) (object.PutObjectStreamer, error) {
@@ -94,40 +125,6 @@ func (c TransportSplitter) GetRangeHash(ctx context.Context, request *object.Get
 	return c.next.GetRangeHash(ctx, request)
 }
 
-func (g *getStreamBasicChecker) Recv() (*object.GetResponse, error) {
-	if g.resp == nil {
-		resp, err := g.next.Recv()
-		if err != nil {
-			return resp, err
-		}
-
-		if part, ok := resp.GetBody().GetObjectPart().(*object.GetObjectPartChunk); !ok {
-			return resp, err
-		} else {
-			g.resp = resp
-			g.buf = bytes.NewBuffer(part.GetChunk())
-		}
-	}
-
-	chunkBody := new(object.GetObjectPartChunk)
-	chunkBody.SetChunk(g.buf.Next(g.chunkSize))
-
-	body := new(object.GetResponseBody)
-	body.SetObjectPart(chunkBody)
-
-	resp := new(object.GetResponse)
-	resp.SetVerificationHeader(g.resp.GetVerificationHeader())
-	resp.SetMetaHeader(g.resp.GetMetaHeader())
-	resp.SetBody(body)
-
-	if g.buf.Len() == 0 {
-		g.buf = nil
-		g.resp = nil
-	}
-
-	return resp, nil
-}
-
 func (r *rangeStreamBasicChecker) Recv() (*object.GetRangeResponse, error) {
 	if r.resp == nil {
 		resp, err := r.next.Recv()

pkg/services/object/util/key.go

@@ -5,7 +5,6 @@ import (
 
 	"github.com/nspcc-dev/neofs-api-go/pkg/token"
 	"github.com/nspcc-dev/neofs-node/pkg/services/session/storage"
-	"github.com/pkg/errors"
 )
 
 // KeyStorage represents private key storage of the local node.
@@ -30,12 +29,10 @@ func NewKeyStorage(localKey *ecdsa.PrivateKey, tokenStore *storage.TokenStore) *
 func (s *KeyStorage) GetKey(token *token.SessionToken) (*ecdsa.PrivateKey, error) {
 	if token != nil {
 		pToken := s.tokenStore.Get(token.OwnerID(), token.ID())
-		if pToken == nil {
+		if pToken != nil {
-			return nil, errors.Wrapf(storage.ErrNotFound, "(%T) could not get session key", s)
-		}
-
 			return pToken.SessionKey(), nil
 		}
+	}
 
 	return s.key, nil
 }

pkg/services/object/util/local.go

@@ -1,45 +0,0 @@
-package util
-
-import (
-	"github.com/nspcc-dev/neofs-api-go/pkg/netmap"
-	"github.com/nspcc-dev/neofs-api-go/pkg/object"
-	"github.com/nspcc-dev/neofs-node/pkg/network"
-	"github.com/nspcc-dev/neofs-node/pkg/services/object_manager/placement"
-	"github.com/pkg/errors"
-)
-
-type localPlacement struct {
-	builder placement.Builder
-
-	localAddrSrc network.LocalAddressSource
-}
-
-func NewLocalPlacement(b placement.Builder, s network.LocalAddressSource) placement.Builder {
-	return &localPlacement{
-		builder:      b,
-		localAddrSrc: s,
-	}
-}
-
-func (p *localPlacement) BuildPlacement(addr *object.Address, policy *netmap.PlacementPolicy) ([]netmap.Nodes, error) {
-	vs, err := p.builder.BuildPlacement(addr, policy)
-	if err != nil {
-		return nil, errors.Wrapf(err, "(%T) could not build object placement", p)
-	}
-
-	for i := range vs {
-		for j := range vs[i] {
-			addr, err := network.AddressFromString(vs[i][j].Address())
-			if err != nil {
-				// TODO: log error
-				continue
-			}
-
-			if network.IsLocalAddress(p.localAddrSrc, addr) {
-				return []netmap.Nodes{{vs[i][j]}}, nil
-			}
-		}
-	}
-
-	return nil, errors.Errorf("(%T) local node is outside of object placement", p)
-}

pkg/services/object/util/placement.go

@@ -0,0 +1,155 @@
+package util
+
+import (
+	netmapSDK "github.com/nspcc-dev/neofs-api-go/pkg/netmap"
+	"github.com/nspcc-dev/neofs-api-go/pkg/object"
+	"github.com/nspcc-dev/neofs-node/pkg/core/container"
+	"github.com/nspcc-dev/neofs-node/pkg/core/netmap"
+	"github.com/nspcc-dev/neofs-node/pkg/network"
+	"github.com/nspcc-dev/neofs-node/pkg/services/object_manager/placement"
+	"github.com/pkg/errors"
+)
+
+type localPlacement struct {
+	builder placement.Builder
+
+	localAddrSrc network.LocalAddressSource
+}
+
+type remotePlacement struct {
+	builder placement.Builder
+
+	localAddrSrc network.LocalAddressSource
+}
+
+// TraverserGenerator represents tool that generates
+// container traverser for the particular need.
+type TraverserGenerator struct {
+	netMapSrc netmap.Source
+
+	cnrSrc container.Source
+
+	localAddrSrc network.LocalAddressSource
+
+	customOpts []placement.Option
+}
+
+func NewLocalPlacement(b placement.Builder, s network.LocalAddressSource) placement.Builder {
+	return &localPlacement{
+		builder:      b,
+		localAddrSrc: s,
+	}
+}
+
+func (p *localPlacement) BuildPlacement(addr *object.Address, policy *netmapSDK.PlacementPolicy) ([]netmapSDK.Nodes, error) {
+	vs, err := p.builder.BuildPlacement(addr, policy)
+	if err != nil {
+		return nil, errors.Wrapf(err, "(%T) could not build object placement", p)
+	}
+
+	for i := range vs {
+		for j := range vs[i] {
+			addr, err := network.AddressFromString(vs[i][j].Address())
+			if err != nil {
+				// TODO: log error
+				continue
+			}
+
+			if network.IsLocalAddress(p.localAddrSrc, addr) {
+				return []netmapSDK.Nodes{{vs[i][j]}}, nil
+			}
+		}
+	}
+
+	return nil, errors.Errorf("(%T) local node is outside of object placement", p)
+}
+
+// NewRemotePlacementBuilder creates, initializes and returns placement builder that
+// excludes local node from any placement vector.
+func NewRemotePlacementBuilder(b placement.Builder, s network.LocalAddressSource) placement.Builder {
+	return &remotePlacement{
+		builder:      b,
+		localAddrSrc: s,
+	}
+}
+
+func (p *remotePlacement) BuildPlacement(addr *object.Address, policy *netmapSDK.PlacementPolicy) ([]netmapSDK.Nodes, error) {
+	vs, err := p.builder.BuildPlacement(addr, policy)
+	if err != nil {
+		return nil, errors.Wrapf(err, "(%T) could not build object placement", p)
+	}
+
+	for i := range vs {
+		for j := 0; j < len(vs[i]); j++ {
+			addr, err := network.AddressFromString(vs[i][j].Address())
+			if err != nil {
+				// TODO: log error
+				continue
+			}
+
+			if network.IsLocalAddress(p.localAddrSrc, addr) {
+				vs[i] = append(vs[i][:j], vs[i][j+1:]...)
+				j--
+			}
+		}
+	}
+
+	return vs, nil
+}
+
+// NewTraverserGenerator creates, initializes and returns new TraverserGenerator instance.
+func NewTraverserGenerator(nmSrc netmap.Source, cnrSrc container.Source, localAddrSrc network.LocalAddressSource) *TraverserGenerator {
+	return &TraverserGenerator{
+		netMapSrc:    nmSrc,
+		cnrSrc:       cnrSrc,
+		localAddrSrc: localAddrSrc,
+	}
+}
+
+// WithTraverseOptions returns TraverseGenerator that additionally applies provided options.
+func (g *TraverserGenerator) WithTraverseOptions(opts ...placement.Option) *TraverserGenerator {
+	return &TraverserGenerator{
+		netMapSrc:    g.netMapSrc,
+		cnrSrc:       g.cnrSrc,
+		localAddrSrc: g.localAddrSrc,
+		customOpts:   opts,
+	}
+}
+
+// GenerateTraverser generates placement Traverser for provided object address.
+func (g *TraverserGenerator) GenerateTraverser(addr *object.Address) (*placement.Traverser, error) {
+	// get latest network map
+	nm, err := netmap.GetLatestNetworkMap(g.netMapSrc)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not get latest network map")
+	}
+
+	// get container related container
+	cnr, err := g.cnrSrc.Get(addr.ContainerID())
+	if err != nil {
+		return nil, errors.Wrap(err, "could not get container")
+	}
+
+	// allocate placement traverser options
+	traverseOpts := make([]placement.Option, 0, 3+len(g.customOpts))
+	traverseOpts = append(traverseOpts, g.customOpts...)
+
+	// create builder of the remote nodes from network map
+	builder := NewRemotePlacementBuilder(
+		placement.NewNetworkMapBuilder(nm),
+		g.localAddrSrc,
+	)
+
+	traverseOpts = append(traverseOpts,
+		// set processing container
+		placement.ForContainer(cnr),
+
+		// set identifier of the processing object
+		placement.ForObject(addr.ObjectID()),
+
+		// set placement builder
+		placement.UseBuilder(builder),
+	)
+
+	return placement.NewTraverser(traverseOpts...)
+}

pkg/services/util/response/server_stream.go

@@ -40,3 +40,11 @@ func (s *Service) HandleServerStreamRequest(ctx context.Context, req interface{}
 		recv: msgRdr,
 	}, nil
 }
+
+func (s *Service) HandleServerStreamRequest_(respWriter util.ResponseMessageWriter) util.ResponseMessageWriter {
+	return func(resp util.ResponseMessage) error {
+		setMeta(resp, s.cfg)
+
+		return respWriter(resp)
+	}
+}

pkg/services/util/server.go

@@ -0,0 +1,10 @@
+package util
+
+import (
+	"context"
+)
+
+// ServerStream is an interface of server-side stream v2.
+type ServerStream interface {
+	Context() context.Context
+}

pkg/services/util/sign.go

@@ -21,6 +21,10 @@ type SignService struct {
 	key *ecdsa.PrivateKey
 }
 
+type ResponseMessageWriter func(ResponseMessage) error
+
+type ServerStreamHandler_ func(interface{}, ResponseMessageWriter) (ResponseMessageWriter, error)
+
 type ServerStreamHandler func(context.Context, interface{}) (ResponseMessageReader, error)
 
 type ResponseMessageReader func() (ResponseMessage, error)
@@ -109,6 +113,21 @@ func (s *SignService) HandleServerStreamRequest(ctx context.Context, req interfa
 	}, nil
 }
 
+func (s *SignService) HandleServerStreamRequest_(req interface{}, respWriter ResponseMessageWriter) (ResponseMessageWriter, error) {
+	// verify request signatures
+	if err := signature.VerifyServiceMessage(req); err != nil {
+		return nil, errors.Wrap(err, "could not verify request")
+	}
+
+	return func(resp ResponseMessage) error {
+		if err := signature.SignServiceMessage(s.key, resp); err != nil {
+			return errors.Wrap(err, "could not sign response message")
+		}
+
+		return respWriter(resp)
+	}, nil
+}
+
 func (s *SignService) HandleUnaryRequest(ctx context.Context, req interface{}, handler UnaryHandler) (ResponseMessage, error) {
 	// verify request signatures
 	if err := signature.VerifyServiceMessage(req); err != nil {