[#172] pool: Use priority of errors in tree pool

When retry happens, use priority map to decide
which error to return. Consider network errors
less desirable than business logic errors.

Signed-off-by: Alex Vanin <a.vanin@yadro.com>

.golangci.yml

@@ -25,7 +25,7 @@ linters-settings:
     # report about shadowed variables
     check-shadowing: false
   staticcheck:
-    checks: ["all", "-SA1019"] # TODO Enable SA1019 after deprecated warning are fixed.
+    checks: ["all"]
   funlen:
     lines: 80 # default 60
     statements: 60 # default 40

checksum/checksum.go

@@ -24,17 +24,17 @@ type Checksum refs.Checksum
 
 // Type represents the enumeration
 // of checksum types.
-type Type uint8
+type Type refs.ChecksumType
 
 const (
 	// Unknown is an undefined checksum type.
-	Unknown Type = iota
+	Unknown Type = Type(refs.UnknownChecksum)
 
 	// SHA256 is a SHA256 checksum type.
-	SHA256
+	SHA256 = Type(refs.SHA256)
 
 	// TZ is a Tillich-Zémor checksum type.
-	TZ
+	TZ = Type(refs.TillichZemor)
 )
 
 // ReadFromV2 reads Checksum from the refs.Checksum message. Checks if the

checksum/example_test.go

@@ -2,9 +2,9 @@ package checksum
 
 import (
 	"bytes"
+	"crypto/rand"
 	"crypto/sha256"
 	"fmt"
-	"math/rand"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs"
 )

checksum/test/generate.go

@@ -1,8 +1,8 @@
 package checksumtest
 
 import (
+	"crypto/rand"
 	"crypto/sha256"
-	"math/rand"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/checksum"
 )
@@ -11,7 +11,7 @@ import (
 func Checksum() checksum.Checksum {
 	var cs [sha256.Size]byte
 
-	rand.Read(cs[:])
+	_, _ = rand.Read(cs[:])
 
 	var x checksum.Checksum
 

client/common.go

@@ -47,6 +47,8 @@ func writeXHeadersToMeta(xHeaders []string, h *v2session.RequestMetaHeader) {
 		return
 	}
 
+	// TODO (aarifullin): remove the panic when all client parameters will check XHeaders
+	// within buildRequest invocation.
 	if len(xHeaders)%2 != 0 {
 		panic("slice of X-Headers with odd length")
 	}

client/container_set_eacl.go

@@ -18,20 +18,20 @@ import (
 
 // PrmContainerSetEACL groups parameters of ContainerSetEACL operation.
 type PrmContainerSetEACL struct {
-	prmCommonMeta
+	// FrostFS request X-Headers.
+	XHeaders []string
 
-	tableSet bool
-	table    eacl.Table
+	Table *eacl.Table
 
-	sessionSet bool
-	session    session.Container
+	Session *session.Container
 }
 
 // SetTable sets eACL table structure to be set for the container.
 // Required parameter.
+//
+// Deprecated: Use PrmContainerSetEACL.Table instead.
 func (x *PrmContainerSetEACL) SetTable(table eacl.Table) {
-	x.table = table
-	x.tableSet = true
+	x.Table = &table
 }
 
 // WithinSession specifies session within which extended ACL of the container
@@ -45,17 +45,22 @@ func (x *PrmContainerSetEACL) SetTable(table eacl.Table) {
 //     for which extended ACL is going to be set
 //   - session operation MUST be session.VerbContainerSetEACL (ForVerb)
 //   - token MUST be signed using private key of the owner of the container to be saved
+//
+// Deprecated: Use PrmContainerSetEACL.Session instead.
 func (x *PrmContainerSetEACL) WithinSession(s session.Container) {
-	x.session = s
-	x.sessionSet = true
+	x.Session = &s
 }
 
 func (x *PrmContainerSetEACL) buildRequest(c *Client) (*v2container.SetExtendedACLRequest, error) {
-	if !x.tableSet {
+	if x.Table == nil {
 		return nil, errorEACLTableNotSet
 	}
 
-	eaclV2 := x.table.ToV2()
+	if len(x.XHeaders)%2 != 0 {
+		return nil, errorInvalidXHeaders
+	}
+
+	eaclV2 := x.Table.ToV2()
 
 	var sig frostfscrypto.Signature
 
@@ -72,11 +77,11 @@ func (x *PrmContainerSetEACL) buildRequest(c *Client) (*v2container.SetExtendedA
 	reqBody.SetSignature(&sigv2)
 
 	var meta v2session.RequestMetaHeader
-	writeXHeadersToMeta(x.prmCommonMeta.xHeaders, &meta)
+	writeXHeadersToMeta(x.XHeaders, &meta)
 
-	if x.sessionSet {
+	if x.Session != nil {
 		var tokv2 v2session.Token
-		x.session.WriteToV2(&tokv2)
+		x.Session.WriteToV2(&tokv2)
 
 		meta.SetSessionToken(&tokv2)
 	}

client/container_space.go

@@ -14,27 +14,29 @@ import (
 
 // PrmAnnounceSpace groups parameters of ContainerAnnounceUsedSpace operation.
 type PrmAnnounceSpace struct {
-	prmCommonMeta
+	XHeaders []string
 
-	announcements []container.SizeEstimation
+	Announcements []container.SizeEstimation
 }
 
 // SetValues sets values describing volume of space that is used for the container objects.
 // Required parameter. Must not be empty.
 //
 // Must not be mutated before the end of the operation.
+//
+// Deprecated: Use PrmAnnounceSpace.Announcements instead.
 func (x *PrmAnnounceSpace) SetValues(vs []container.SizeEstimation) {
-	x.announcements = vs
+	x.Announcements = vs
 }
 
 func (x *PrmAnnounceSpace) buildRequest(c *Client) (*v2container.AnnounceUsedSpaceRequest, error) {
-	if len(x.announcements) == 0 {
+	if len(x.Announcements) == 0 {
 		return nil, errorMissingAnnouncements
 	}
 
-	v2announce := make([]v2container.UsedSpaceAnnouncement, len(x.announcements))
-	for i := range x.announcements {
-		x.announcements[i].WriteToV2(&v2announce[i])
+	v2announce := make([]v2container.UsedSpaceAnnouncement, len(x.Announcements))
+	for i := range x.Announcements {
+		x.Announcements[i].WriteToV2(&v2announce[i])
 	}
 
 	reqBody := new(v2container.AnnounceUsedSpaceRequestBody)

client/netmap.go

@@ -16,12 +16,12 @@ import (
 
 // PrmEndpointInfo groups parameters of EndpointInfo operation.
 type PrmEndpointInfo struct {
-	prmCommonMeta
+	XHeaders []string
 }
 
 func (x *PrmEndpointInfo) buildRequest(c *Client) (*v2netmap.LocalNodeInfoRequest, error) {
 	meta := new(v2session.RequestMetaHeader)
-	writeXHeadersToMeta(x.xHeaders, meta)
+	writeXHeadersToMeta(x.XHeaders, meta)
 
 	req := new(v2netmap.LocalNodeInfoRequest)
 	req.SetBody(new(v2netmap.LocalNodeInfoRequestBody))
@@ -112,12 +112,12 @@ func (c *Client) EndpointInfo(ctx context.Context, prm PrmEndpointInfo) (*ResEnd
 
 // PrmNetworkInfo groups parameters of NetworkInfo operation.
 type PrmNetworkInfo struct {
-	prmCommonMeta
+	XHeaders []string
 }
 
 func (x PrmNetworkInfo) buildRequest(c *Client) (*v2netmap.NetworkInfoRequest, error) {
 	meta := new(v2session.RequestMetaHeader)
-	writeXHeadersToMeta(x.xHeaders, meta)
+	writeXHeadersToMeta(x.XHeaders, meta)
 
 	var req v2netmap.NetworkInfoRequest
 	req.SetBody(new(v2netmap.NetworkInfoRequestBody))

client/object_delete.go

@@ -21,71 +21,25 @@ import (
 
 // PrmObjectDelete groups parameters of ObjectDelete operation.
 type PrmObjectDelete struct {
-	meta v2session.RequestMetaHeader
+	XHeaders []string
 
-	body v2object.DeleteRequestBody
+	BearerToken *bearer.Token
 
-	addr v2refs.Address
+	Session *session.Object
 
-	keySet bool
-	key    ecdsa.PrivateKey
-}
+	ContainerID *cid.ID
 
-// WithinSession specifies session within which object should be read.
-//
-// Creator of the session acquires the authorship of the request.
-// This may affect the execution of an operation (e.g. access control).
-//
-// Must be signed.
-func (x *PrmObjectDelete) WithinSession(t session.Object) {
-	var tv2 v2session.Token
-	t.WriteToV2(&tv2)
+	ObjectID *oid.ID
 
-	x.meta.SetSessionToken(&tv2)
-}
-
-// WithBearerToken attaches bearer token to be used for the operation.
-//
-// If set, underlying eACL rules will be used in access control.
-//
-// Must be signed.
-func (x *PrmObjectDelete) WithBearerToken(t bearer.Token) {
-	var v2token acl.BearerToken
-	t.WriteToV2(&v2token)
-	x.meta.SetBearerToken(&v2token)
-}
-
-// FromContainer specifies FrostFS container of the object.
-// Required parameter.
-func (x *PrmObjectDelete) FromContainer(id cid.ID) {
-	var cidV2 v2refs.ContainerID
-	id.WriteToV2(&cidV2)
-
-	x.addr.SetContainerID(&cidV2)
-}
-
-// ByID specifies identifier of the requested object.
-// Required parameter.
-func (x *PrmObjectDelete) ByID(id oid.ID) {
-	var idV2 v2refs.ObjectID
-	id.WriteToV2(&idV2)
-
-	x.addr.SetObjectID(&idV2)
+	Key *ecdsa.PrivateKey
 }
 
 // UseKey specifies private key to sign the requests.
 // If key is not provided, then Client default key is used.
-func (x *PrmObjectDelete) UseKey(key ecdsa.PrivateKey) {
-	x.keySet = true
-	x.key = key
-}
-
-// WithXHeaders specifies list of extended headers (string key-value pairs)
-// to be attached to the request. Must have an even length.
 //
-// Slice must not be mutated until the operation completes.
-func (x *PrmObjectDelete) WithXHeaders(hs ...string) {
-	writeXHeadersToMeta(hs, &x.meta)
+// Deprecated: Use PrmObjectDelete.Key instead.
+func (prm *PrmObjectDelete) UseKey(key ecdsa.PrivateKey) {
+	prm.Key = &key
 }
 
 // ResObjectDelete groups resulting values of ObjectDelete operation.
@@ -100,6 +54,54 @@ func (x ResObjectDelete) Tombstone() oid.ID {
 	return x.tomb
 }
 
+func (prm *PrmObjectDelete) buildRequest(c *Client) (*v2object.DeleteRequest, error) {
+	if prm.ContainerID == nil {
+		return nil, errorMissingContainer
+	}
+
+	if prm.ObjectID == nil {
+		return nil, errorMissingObject
+	}
+
+	if len(prm.XHeaders)%2 != 0 {
+		return nil, errorInvalidXHeaders
+	}
+
+	meta := new(v2session.RequestMetaHeader)
+	writeXHeadersToMeta(prm.XHeaders, meta)
+
+	if prm.BearerToken != nil {
+		v2BearerToken := new(acl.BearerToken)
+		prm.BearerToken.WriteToV2(v2BearerToken)
+		meta.SetBearerToken(v2BearerToken)
+	}
+
+	if prm.Session != nil {
+		v2SessionToken := new(v2session.Token)
+		prm.Session.WriteToV2(v2SessionToken)
+		meta.SetSessionToken(v2SessionToken)
+	}
+
+	addr := new(v2refs.Address)
+
+	cnrV2 := new(v2refs.ContainerID)
+	prm.ContainerID.WriteToV2(cnrV2)
+	addr.SetContainerID(cnrV2)
+
+	objV2 := new(v2refs.ObjectID)
+	prm.ObjectID.WriteToV2(objV2)
+	addr.SetObjectID(objV2)
+
+	body := new(v2object.DeleteRequestBody)
+	body.SetAddress(addr)
+
+	req := new(v2object.DeleteRequest)
+	req.SetBody(body)
+	c.prepareRequest(req, meta)
+
+	return req, nil
+}
+
 // ObjectDelete marks an object for deletion from the container using FrostFS API protocol.
 // As a marker, a special unit called a tombstone is placed in the container.
 // It confirms the user's intent to delete the object, and is itself a container object.
@@ -124,32 +126,22 @@ func (x ResObjectDelete) Tombstone() oid.ID {
 //   - *apistatus.ObjectLocked;
 //   - *apistatus.SessionTokenExpired.
 func (c *Client) ObjectDelete(ctx context.Context, prm PrmObjectDelete) (*ResObjectDelete, error) {
-	switch {
-	case prm.addr.GetContainerID() == nil:
-		return nil, errorMissingContainer
-	case prm.addr.GetObjectID() == nil:
-		return nil, errorMissingObject
+	req, err := prm.buildRequest(c)
+	if err != nil {
+		return nil, err
 	}
 
-	// form request body
-	prm.body.SetAddress(&prm.addr)
-
-	// form request
-	var req v2object.DeleteRequest
-	req.SetBody(&prm.body)
-	c.prepareRequest(&req, &prm.meta)
-
 	key := c.prm.key
-	if prm.keySet {
-		key = prm.key
+	if prm.Key != nil {
+		key = *prm.Key
 	}
 
-	err := signature.SignServiceMessage(&key, &req)
+	err = signature.SignServiceMessage(&key, req)
 	if err != nil {
 		return nil, fmt.Errorf("sign request: %w", err)
 	}
 
-	resp, err := rpcapi.DeleteObject(&c.c, &req, client.WithContext(ctx))
+	resp, err := rpcapi.DeleteObject(&c.c, req, client.WithContext(ctx))
 	if err != nil {
 		return nil, err
 	}

client/object_get.go

@@ -22,77 +22,76 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/session"
 )
 
-// shared parameters of GET/HEAD/RANGE.
-type prmObjectRead struct {
-	meta v2session.RequestMetaHeader
-
-	raw bool
-
-	addr v2refs.Address
-}
-
-// WithXHeaders specifies list of extended headers (string key-value pairs)
-// to be attached to the request. Must have an even length.
-//
-// Slice must not be mutated until the operation completes.
-func (x *prmObjectRead) WithXHeaders(hs ...string) {
-	writeXHeadersToMeta(hs, &x.meta)
-}
-
-// MarkRaw marks an intent to read physically stored object.
-func (x *prmObjectRead) MarkRaw() {
-	x.raw = true
-}
-
-// MarkLocal tells the server to execute the operation locally.
-func (x *prmObjectRead) MarkLocal() {
-	x.meta.SetTTL(1)
-}
-
-// WithinSession specifies session within which object should be read.
-//
-// Creator of the session acquires the authorship of the request.
-// This may affect the execution of an operation (e.g. access control).
-//
-// Must be signed.
-func (x *prmObjectRead) WithinSession(t session.Object) {
-	var tokv2 v2session.Token
-	t.WriteToV2(&tokv2)
-	x.meta.SetSessionToken(&tokv2)
-}
-
-// WithBearerToken attaches bearer token to be used for the operation.
-//
-// If set, underlying eACL rules will be used in access control.
-//
-// Must be signed.
-func (x *prmObjectRead) WithBearerToken(t bearer.Token) {
-	var v2token acl.BearerToken
-	t.WriteToV2(&v2token)
-	x.meta.SetBearerToken(&v2token)
-}
-
-// FromContainer specifies FrostFS container of the object.
-// Required parameter.
-func (x *prmObjectRead) FromContainer(id cid.ID) {
-	var cnrV2 v2refs.ContainerID
-	id.WriteToV2(&cnrV2)
-	x.addr.SetContainerID(&cnrV2)
-}
-
-// ByID specifies identifier of the requested object.
-// Required parameter.
-func (x *prmObjectRead) ByID(id oid.ID) {
-	var objV2 v2refs.ObjectID
-	id.WriteToV2(&objV2)
-	x.addr.SetObjectID(&objV2)
-}
-
 // PrmObjectGet groups parameters of ObjectGetInit operation.
 type PrmObjectGet struct {
-	prmObjectRead
+	XHeaders []string
 
-	key *ecdsa.PrivateKey
+	BearerToken *bearer.Token
+
+	Session *session.Object
+
+	Raw bool
+
+	Local bool
+
+	ContainerID *cid.ID
+
+	ObjectID *oid.ID
+
+	Key *ecdsa.PrivateKey
+}
+
+func (prm *PrmObjectGet) buildRequest(c *Client) (*v2object.GetRequest, error) {
+	if prm.ContainerID == nil {
+		return nil, errorMissingContainer
+	}
+
+	if prm.ObjectID == nil {
+		return nil, errorMissingObject
+	}
+
+	if len(prm.XHeaders)%2 != 0 {
+		return nil, errorInvalidXHeaders
+	}
+
+	meta := new(v2session.RequestMetaHeader)
+	writeXHeadersToMeta(prm.XHeaders, meta)
+
+	if prm.BearerToken != nil {
+		v2BearerToken := new(acl.BearerToken)
+		prm.BearerToken.WriteToV2(v2BearerToken)
+		meta.SetBearerToken(v2BearerToken)
+	}
+
+	if prm.Session != nil {
+		v2SessionToken := new(v2session.Token)
+		prm.Session.WriteToV2(v2SessionToken)
+		meta.SetSessionToken(v2SessionToken)
+	}
+
+	if prm.Local {
+		meta.SetTTL(1)
+	}
+
+	addr := new(v2refs.Address)
+
+	cnrV2 := new(v2refs.ContainerID)
+	prm.ContainerID.WriteToV2(cnrV2)
+	addr.SetContainerID(cnrV2)
+
+	objV2 := new(v2refs.ObjectID)
+	prm.ObjectID.WriteToV2(objV2)
+	addr.SetObjectID(objV2)
+
+	body := new(v2object.GetRequestBody)
+	body.SetRaw(prm.Raw)
+	body.SetAddress(addr)
+
+	req := new(v2object.GetRequest)
+	req.SetBody(body)
+	c.prepareRequest(req, meta)
+
+	return req, nil
 }
 
 // ResObjectGet groups the final result values of ObjectGetInit operation.
@@ -122,8 +121,10 @@ type ObjectReader struct {
 
 // UseKey specifies private key to sign the requests.
 // If key is not provided, then Client default key is used.
-func (x *PrmObjectGet) UseKey(key ecdsa.PrivateKey) {
-	x.key = &key
+//
+// Deprecated: Use PrmObjectGet.Key instead.
+func (prm *PrmObjectGet) UseKey(key ecdsa.PrivateKey) {
+	prm.Key = &key
 }
 
 // ReadHeader reads header of the object. Result means success.
@@ -299,39 +300,24 @@ func (x *ObjectReader) Read(p []byte) (int, error) {
 // Returns an error if parameters are set incorrectly (see PrmObjectGet docs).
 // Context is required and must not be nil. It is used for network communication.
 func (c *Client) ObjectGetInit(ctx context.Context, prm PrmObjectGet) (*ObjectReader, error) {
-	// check parameters
-	switch {
-	case prm.addr.GetContainerID() == nil:
-		return nil, errorMissingContainer
-	case prm.addr.GetObjectID() == nil:
-		return nil, errorMissingObject
+	req, err := prm.buildRequest(c)
+	if err != nil {
+		return nil, err
 	}
 
-	// form request body
-	var body v2object.GetRequestBody
-
-	body.SetRaw(prm.raw)
-	body.SetAddress(&prm.addr)
-
-	// form request
-	var req v2object.GetRequest
-
-	req.SetBody(&body)
-	c.prepareRequest(&req, &prm.meta)
-
-	key := prm.key
+	key := prm.Key
 	if key == nil {
 		key = &c.prm.key
 	}
 
-	err := signature.SignServiceMessage(key, &req)
+	err = signature.SignServiceMessage(key, req)
 	if err != nil {
 		return nil, fmt.Errorf("sign request: %w", err)
 	}
 
 	ctx, cancel := context.WithCancel(ctx)
 
-	stream, err := rpcapi.GetObject(&c.c, &req, client.WithContext(ctx))
+	stream, err := rpcapi.GetObject(&c.c, req, client.WithContext(ctx))
 	if err != nil {
 		cancel()
 		return nil, fmt.Errorf("open stream: %w", err)
@@ -347,17 +333,29 @@ func (c *Client) ObjectGetInit(ctx context.Context, prm PrmObjectGet) (*ObjectRe
 
 // PrmObjectHead groups parameters of ObjectHead operation.
 type PrmObjectHead struct {
-	prmObjectRead
+	XHeaders []string
 
-	keySet bool
-	key    ecdsa.PrivateKey
+	BearerToken *bearer.Token
+
+	Session *session.Object
+
+	Raw bool
+
+	Local bool
+
+	ContainerID *cid.ID
+
+	ObjectID *oid.ID
+
+	Key *ecdsa.PrivateKey
 }
 
 // UseKey specifies private key to sign the requests.
 // If key is not provided, then Client default key is used.
-func (x *PrmObjectHead) UseKey(key ecdsa.PrivateKey) {
-	x.keySet = true
-	x.key = key
+//
+// Deprecated: Use PrmObjectHead.Key instead.
+func (prm *PrmObjectHead) UseKey(key ecdsa.PrivateKey) {
+	prm.Key = &key
 }
 
 // ResObjectHead groups resulting values of ObjectHead operation.
@@ -390,6 +388,58 @@ func (x *ResObjectHead) ReadHeader(dst *object.Object) bool {
 	return true
 }
 
+func (prm *PrmObjectHead) buildRequest(c *Client) (*v2object.HeadRequest, error) {
+	if prm.ContainerID == nil {
+		return nil, errorMissingContainer
+	}
+
+	if prm.ObjectID == nil {
+		return nil, errorMissingObject
+	}
+
+	if len(prm.XHeaders)%2 != 0 {
+		return nil, errorInvalidXHeaders
+	}
+
+	meta := new(v2session.RequestMetaHeader)
+	writeXHeadersToMeta(prm.XHeaders, meta)
+
+	if prm.BearerToken != nil {
+		v2BearerToken := new(acl.BearerToken)
+		prm.BearerToken.WriteToV2(v2BearerToken)
+		meta.SetBearerToken(v2BearerToken)
+	}
+
+	if prm.Session != nil {
+		v2SessionToken := new(v2session.Token)
+		prm.Session.WriteToV2(v2SessionToken)
+		meta.SetSessionToken(v2SessionToken)
+	}
+
+	if prm.Local {
+		meta.SetTTL(1)
+	}
+
+	addr := new(v2refs.Address)
+
+	cnrV2 := new(v2refs.ContainerID)
+	prm.ContainerID.WriteToV2(cnrV2)
+	addr.SetContainerID(cnrV2)
+
+	objV2 := new(v2refs.ObjectID)
+	prm.ObjectID.WriteToV2(objV2)
+	addr.SetObjectID(objV2)
+	body := new(v2object.HeadRequestBody)
+	body.SetRaw(prm.Raw)
+	body.SetAddress(addr)
+
+	req := new(v2object.HeadRequest)
+	req.SetBody(body)
+	c.prepareRequest(req, meta)
+
+	return req, nil
+}
+
 // ObjectHead reads object header through a remote server using FrostFS API protocol.
 //
 // Exactly one return value is non-nil. By default, server status is returned in res structure.
@@ -413,33 +463,24 @@ func (x *ResObjectHead) ReadHeader(dst *object.Object) bool {
 //   - *apistatus.ObjectAlreadyRemoved;
 //   - *apistatus.SessionTokenExpired.
 func (c *Client) ObjectHead(ctx context.Context, prm PrmObjectHead) (*ResObjectHead, error) {
-	switch {
-	case prm.addr.GetContainerID() == nil:
-		return nil, errorMissingContainer
-	case prm.addr.GetObjectID() == nil:
-		return nil, errorMissingObject
+	req, err := prm.buildRequest(c)
+	if err != nil {
+		return nil, err
 	}
 
-	var body v2object.HeadRequestBody
-	body.SetRaw(prm.raw)
-	body.SetAddress(&prm.addr)
-
-	var req v2object.HeadRequest
-	req.SetBody(&body)
-	c.prepareRequest(&req, &prm.meta)
-
 	key := c.prm.key
-	if prm.keySet {
-		key = prm.key
+	if prm.Key != nil {
+		key = *prm.Key
 	}
 
 	// sign the request
-	err := signature.SignServiceMessage(&key, &req)
+
+	err = signature.SignServiceMessage(&key, req)
 	if err != nil {
 		return nil, fmt.Errorf("sign request: %w", err)
 	}
 
-	resp, err := rpcapi.HeadObject(&c.c, &req, client.WithContext(ctx))
+	resp, err := rpcapi.HeadObject(&c.c, req, client.WithContext(ctx))
 	if err != nil {
 		return nil, fmt.Errorf("write request: %w", err)
 	}
@@ -454,7 +495,7 @@ func (c *Client) ObjectHead(ctx context.Context, prm PrmObjectHead) (*ResObjectH
 		return &res, nil
 	}
 
-	_ = res.idObj.ReadFromV2(*prm.addr.GetObjectID())
+	res.idObj = *prm.ObjectID
 
 	switch v := resp.GetBody().GetHeaderPart().(type) {
 	default:
@@ -470,29 +511,95 @@ func (c *Client) ObjectHead(ctx context.Context, prm PrmObjectHead) (*ResObjectH
 
 // PrmObjectRange groups parameters of ObjectRange operation.
 type PrmObjectRange struct {
-	prmObjectRead
+	XHeaders []string
 
-	key *ecdsa.PrivateKey
+	BearerToken *bearer.Token
 
-	rng v2object.Range
+	Session *session.Object
+
+	Raw bool
+
+	Local bool
+
+	ContainerID *cid.ID
+
+	ObjectID *oid.ID
+
+	Key *ecdsa.PrivateKey
+
+	Offset uint64
+
+	Length uint64
 }
 
-// SetOffset sets offset of the payload range to be read.
-// Zero by default.
-func (x *PrmObjectRange) SetOffset(off uint64) {
-	x.rng.SetOffset(off)
+func (prm *PrmObjectRange) buildRequest(c *Client) (*v2object.GetRangeRequest, error) {
+	if prm.Length == 0 {
+		return nil, errorZeroRangeLength
 	}
 
-// SetLength sets length of the payload range to be read.
-// Must be positive.
-func (x *PrmObjectRange) SetLength(ln uint64) {
-	x.rng.SetLength(ln)
+	if prm.ContainerID == nil {
+		return nil, errorMissingContainer
+	}
+
+	if prm.ObjectID == nil {
+		return nil, errorMissingObject
+	}
+
+	if len(prm.XHeaders)%2 != 0 {
+		return nil, errorInvalidXHeaders
+	}
+
+	meta := new(v2session.RequestMetaHeader)
+	writeXHeadersToMeta(prm.XHeaders, meta)
+
+	if prm.BearerToken != nil {
+		v2BearerToken := new(acl.BearerToken)
+		prm.BearerToken.WriteToV2(v2BearerToken)
+		meta.SetBearerToken(v2BearerToken)
+	}
+
+	if prm.Session != nil {
+		v2SessionToken := new(v2session.Token)
+		prm.Session.WriteToV2(v2SessionToken)
+		meta.SetSessionToken(v2SessionToken)
+	}
+
+	if prm.Local {
+		meta.SetTTL(1)
+	}
+
+	addr := new(v2refs.Address)
+
+	cnrV2 := new(v2refs.ContainerID)
+	prm.ContainerID.WriteToV2(cnrV2)
+	addr.SetContainerID(cnrV2)
+
+	objV2 := new(v2refs.ObjectID)
+	prm.ObjectID.WriteToV2(objV2)
+	addr.SetObjectID(objV2)
+
+	rng := new(v2object.Range)
+	rng.SetLength(prm.Length)
+	rng.SetOffset(prm.Offset)
+
+	body := new(v2object.GetRangeRequestBody)
+	body.SetRaw(prm.Raw)
+	body.SetAddress(addr)
+	body.SetRange(rng)
+
+	req := new(v2object.GetRangeRequest)
+	req.SetBody(body)
+	c.prepareRequest(req, meta)
+
+	return req, nil
 }
 
 // UseKey specifies private key to sign the requests.
 // If key is not provided, then Client default key is used.
-func (x *PrmObjectRange) UseKey(key ecdsa.PrivateKey) {
-	x.key = &key
+//
+// Deprecated: Use PrmObjectRange.Key instead.
+func (prm *PrmObjectRange) UseKey(key ecdsa.PrivateKey) {
+	prm.Key = &key
 }
 
 // ResObjectRange groups the final result values of ObjectRange operation.
@@ -662,49 +769,31 @@ func (x *ObjectRangeReader) Read(p []byte) (int, error) {
 // Returns an error if parameters are set incorrectly (see PrmObjectRange docs).
 // Context is required and must not be nil. It is used for network communication.
 func (c *Client) ObjectRangeInit(ctx context.Context, prm PrmObjectRange) (*ObjectRangeReader, error) {
-	// check parameters
-	switch {
-	case prm.addr.GetContainerID() == nil:
-		return nil, errorMissingContainer
-	case prm.addr.GetObjectID() == nil:
-		return nil, errorMissingObject
-	case prm.rng.GetLength() == 0:
-		return nil, errorZeroRangeLength
+	req, err := prm.buildRequest(c)
+	if err != nil {
+		return nil, err
 	}
 
-	// form request body
-	var body v2object.GetRangeRequestBody
-
-	body.SetRaw(prm.raw)
-	body.SetAddress(&prm.addr)
-	body.SetRange(&prm.rng)
-
-	// form request
-	var req v2object.GetRangeRequest
-
-	req.SetBody(&body)
-	c.prepareRequest(&req, &prm.meta)
-
-	key := prm.key
+	key := prm.Key
 	if key == nil {
 		key = &c.prm.key
 	}
 
-	err := signature.SignServiceMessage(key, &req)
+	err = signature.SignServiceMessage(key, req)
 	if err != nil {
 		return nil, fmt.Errorf("sign request: %w", err)
 	}
 
 	ctx, cancel := context.WithCancel(ctx)
 
-	stream, err := rpcapi.GetObjectRange(&c.c, &req, client.WithContext(ctx))
+	stream, err := rpcapi.GetObjectRange(&c.c, req, client.WithContext(ctx))
 	if err != nil {
 		cancel()
 		return nil, fmt.Errorf("open stream: %w", err)
 	}
 
 	var r ObjectRangeReader
-	r.remainingPayloadLen = int(prm.rng.GetLength())
+	r.remainingPayloadLen = int(prm.Length)
 	r.cancelCtxStream = cancel
 	r.stream = stream
 	r.client = c

client/object_hash.go

@@ -13,121 +13,53 @@ import (
 	v2session "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/session"
 	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/signature"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/bearer"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/checksum"
 	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
 	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/session"
 )
 
 // PrmObjectHash groups parameters of ObjectHash operation.
 type PrmObjectHash struct {
-	meta v2session.RequestMetaHeader
+	XHeaders []string
 
-	body v2object.GetRangeHashRequestBody
+	BearerToken *bearer.Token
 
-	csAlgo v2refs.ChecksumType
+	Session *session.Object
 
-	addr v2refs.Address
+	Local bool
 
-	keySet bool
-	key    ecdsa.PrivateKey
+	Ranges []object.Range
+
+	Salt []byte
+
+	ChecksumType checksum.Type
+
+	ContainerID *cid.ID
+
+	ObjectID *oid.ID
+
+	Key *ecdsa.PrivateKey
 }
 
 // UseKey specifies private key to sign the requests.
 // If key is not provided, then Client default key is used.
-func (x *PrmObjectHash) UseKey(key ecdsa.PrivateKey) {
-	x.keySet = true
-	x.key = key
-}
-
-// MarkLocal tells the server to execute the operation locally.
-func (x *PrmObjectHash) MarkLocal() {
-	x.meta.SetTTL(1)
-}
-
-// WithinSession specifies session within which object should be read.
 //
-// Creator of the session acquires the authorship of the request.
-// This may affect the execution of an operation (e.g. access control).
-//
-// Must be signed.
-func (x *PrmObjectHash) WithinSession(t session.Object) {
-	var tv2 v2session.Token
-	t.WriteToV2(&tv2)
-
-	x.meta.SetSessionToken(&tv2)
-}
-
-// WithBearerToken attaches bearer token to be used for the operation.
-//
-// If set, underlying eACL rules will be used in access control.
-//
-// Must be signed.
-func (x *PrmObjectHash) WithBearerToken(t bearer.Token) {
-	var v2token acl.BearerToken
-	t.WriteToV2(&v2token)
-	x.meta.SetBearerToken(&v2token)
-}
-
-// FromContainer specifies FrostFS container of the object.
-// Required parameter.
-func (x *PrmObjectHash) FromContainer(id cid.ID) {
-	var cidV2 v2refs.ContainerID
-	id.WriteToV2(&cidV2)
-
-	x.addr.SetContainerID(&cidV2)
-}
-
-// ByID specifies identifier of the requested object.
-// Required parameter.
-func (x *PrmObjectHash) ByID(id oid.ID) {
-	var idV2 v2refs.ObjectID
-	id.WriteToV2(&idV2)
-
-	x.addr.SetObjectID(&idV2)
-}
-
-// SetRangeList sets list of ranges in (offset, length) pair format.
-// Required parameter.
-//
-// If passed as slice, then it must not be mutated before the operation completes.
-func (x *PrmObjectHash) SetRangeList(r ...uint64) {
-	ln := len(r)
-	if ln%2 != 0 {
-		panic("odd number of range parameters")
-	}
-
-	rs := make([]v2object.Range, ln/2)
-
-	for i := 0; i < ln/2; i++ {
-		rs[i].SetOffset(r[2*i])
-		rs[i].SetLength(r[2*i+1])
-	}
-
-	x.body.SetRanges(rs)
+// Deprecated: Use PrmObjectHash.Key instead.
+func (prm *PrmObjectHash) UseKey(key ecdsa.PrivateKey) {
+	prm.Key = &key
 }
 
 // TillichZemorAlgo changes the hash function to Tillich-Zemor
 // (https://link.springer.com/content/pdf/10.1007/3-540-48658-5_5.pdf).
 //
-// By default, SHA256 hash function is used.
-func (x *PrmObjectHash) TillichZemorAlgo() {
-	x.csAlgo = v2refs.TillichZemor
-}
-
-// UseSalt sets the salt to XOR the data range before hashing.
+// By default, SHA256 hash function is used/.
 //
-// Must not be mutated before the operation completes.
-func (x *PrmObjectHash) UseSalt(salt []byte) {
-	x.body.SetSalt(salt)
-}
-
-// WithXHeaders specifies list of extended headers (string key-value pairs)
-// to be attached to the request. Must have an even length.
-//
-// Slice must not be mutated until the operation completes.
-func (x *PrmObjectHash) WithXHeaders(hs ...string) {
-	writeXHeadersToMeta(hs, &x.meta)
+// Deprecated: Use PrmObjectHash.ChecksumType instead.
+func (prm *PrmObjectHash) TillichZemorAlgo() {
+	prm.ChecksumType = checksum.TZ
 }
 
 // ResObjectHash groups resulting values of ObjectHash operation.
@@ -142,6 +74,76 @@ func (x ResObjectHash) Checksums() [][]byte {
 	return x.checksums
 }
 
+func (prm *PrmObjectHash) buildRequest(c *Client) (*v2object.GetRangeHashRequest, error) {
+	if prm.ContainerID == nil {
+		return nil, errorMissingContainer
+	}
+
+	if prm.ObjectID == nil {
+		return nil, errorMissingObject
+	}
+
+	if len(prm.XHeaders)%2 != 0 {
+		return nil, errorInvalidXHeaders
+	}
+
+	if len(prm.Ranges) == 0 {
+		return nil, errorMissingRanges
+	}
+
+	meta := new(v2session.RequestMetaHeader)
+	writeXHeadersToMeta(prm.XHeaders, meta)
+
+	if prm.BearerToken != nil {
+		v2BearerToken := new(acl.BearerToken)
+		prm.BearerToken.WriteToV2(v2BearerToken)
+		meta.SetBearerToken(v2BearerToken)
+	}
+
+	if prm.Session != nil {
+		v2SessionToken := new(v2session.Token)
+		prm.Session.WriteToV2(v2SessionToken)
+		meta.SetSessionToken(v2SessionToken)
+	}
+
+	if prm.Local {
+		meta.SetTTL(1)
+	}
+
+	addr := new(v2refs.Address)
+
+	cnrV2 := new(v2refs.ContainerID)
+	prm.ContainerID.WriteToV2(cnrV2)
+	addr.SetContainerID(cnrV2)
+
+	objV2 := new(v2refs.ObjectID)
+	prm.ObjectID.WriteToV2(objV2)
+	addr.SetObjectID(objV2)
+
+	rs := make([]v2object.Range, len(prm.Ranges))
+	for i := range prm.Ranges {
+		rs[i].SetOffset(prm.Ranges[i].GetOffset())
+		rs[i].SetLength(prm.Ranges[i].GetLength())
+	}
+
+	body := new(v2object.GetRangeHashRequestBody)
+	body.SetAddress(addr)
+	body.SetRanges(rs)
+	body.SetSalt(prm.Salt)
+
+	if prm.ChecksumType == checksum.Unknown {
+		body.SetType(v2refs.SHA256)
+	} else {
+		body.SetType(v2refs.ChecksumType(prm.ChecksumType))
+	}
+
+	req := new(v2object.GetRangeHashRequest)
+	req.SetBody(body)
+	c.prepareRequest(req, meta)
+
+	return req, nil
+}
+
 // ObjectHash requests checksum of the range list of the object payload using
 // FrostFS API protocol.
 //
@@ -165,37 +167,22 @@ func (x ResObjectHash) Checksums() [][]byte {
 //   - *apistatus.ObjectOutOfRange;
 //   - *apistatus.SessionTokenExpired.
 func (c *Client) ObjectHash(ctx context.Context, prm PrmObjectHash) (*ResObjectHash, error) {
-	switch {
-	case prm.addr.GetContainerID() == nil:
-		return nil, errorMissingContainer
-	case prm.addr.GetObjectID() == nil:
-		return nil, errorMissingObject
-	case len(prm.body.GetRanges()) == 0:
-		return nil, errorMissingRanges
+	req, err := prm.buildRequest(c)
+	if err != nil {
+		return nil, err
 	}
 
-	prm.body.SetAddress(&prm.addr)
-	if prm.csAlgo == v2refs.UnknownChecksum {
-		prm.body.SetType(v2refs.SHA256)
-	} else {
-		prm.body.SetType(prm.csAlgo)
-	}
-
-	var req v2object.GetRangeHashRequest
-	c.prepareRequest(&req, &prm.meta)
-	req.SetBody(&prm.body)
-
 	key := c.prm.key
-	if prm.keySet {
-		key = prm.key
+	if prm.Key != nil {
+		key = *prm.Key
 	}
 
-	err := signature.SignServiceMessage(&key, &req)
+	err = signature.SignServiceMessage(&key, req)
 	if err != nil {
 		return nil, fmt.Errorf("sign request: %w", err)
 	}
 
-	resp, err := rpcapi.HashObjectRange(&c.c, &req, client.WithContext(ctx))
+	resp, err := rpcapi.HashObjectRange(&c.c, req, client.WithContext(ctx))
 	if err != nil {
 		return nil, fmt.Errorf("write request: %w", err)
 	}

client/session.go

@@ -16,30 +16,32 @@ import (
 
 // PrmSessionCreate groups parameters of SessionCreate operation.
 type PrmSessionCreate struct {
-	prmCommonMeta
+	XHeaders []string
 
-	exp uint64
+	Expiration uint64
 
-	keySet bool
-	key    ecdsa.PrivateKey
+	Key *ecdsa.PrivateKey
 }
 
 // SetExp sets number of the last NepFS epoch in the lifetime of the session after which it will be expired.
+//
+// Deprecated: Use PrmSessionCreate.Expiration instead.
 func (x *PrmSessionCreate) SetExp(exp uint64) {
-	x.exp = exp
+	x.Expiration = exp
 }
 
 // UseKey specifies private key to sign the requests and compute token owner.
 // If key is not provided, then Client default key is used.
+//
+// Deprecated: Use PrmSessionCreate.Key instead.
 func (x *PrmSessionCreate) UseKey(key ecdsa.PrivateKey) {
-	x.keySet = true
-	x.key = key
+	x.Key = &key
 }
 
 func (x *PrmSessionCreate) buildRequest(c *Client) (*v2session.CreateRequest, error) {
 	ownerKey := c.prm.key.PublicKey
-	if x.keySet {
-		ownerKey = x.key.PublicKey
+	if x.Key != nil {
+		ownerKey = x.Key.PublicKey
 	}
 	var ownerID user.ID
 	user.IDFromKey(&ownerID, ownerKey)
@@ -49,10 +51,10 @@ func (x *PrmSessionCreate) buildRequest(c *Client) (*v2session.CreateRequest, er
 
 	reqBody := new(v2session.CreateRequestBody)
 	reqBody.SetOwnerID(&ownerIDV2)
-	reqBody.SetExpiration(x.exp)
+	reqBody.SetExpiration(x.Expiration)
 
 	var meta v2session.RequestMetaHeader
-	writeXHeadersToMeta(x.xHeaders, &meta)
+	writeXHeadersToMeta(x.XHeaders, &meta)
 
 	var req v2session.CreateRequest
 	req.SetBody(reqBody)

container/id/id_test.go

@@ -1,8 +1,8 @@
 package cid_test
 
 import (
+	"crypto/rand"
 	"crypto/sha256"
-	"math/rand"
 	"testing"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs"

container/id/test/id.go

@@ -1,8 +1,8 @@
 package cidtest
 
 import (
+	"crypto/rand"
 	"crypto/sha256"
-	"math/rand"
 
 	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
 )
@@ -11,7 +11,7 @@ import (
 func ID() cid.ID {
 	checksum := [sha256.Size]byte{}
 
-	rand.Read(checksum[:])
+	_, _ = rand.Read(checksum[:])
 
 	return IDWithChecksum(checksum)
 }

crypto/crypto_test.go

@@ -1,7 +1,7 @@
 package frostfscrypto_test
 
 import (
-	"math/rand"
+	"crypto/rand"
 	"testing"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs"

doc/policy.md

@@ -131,7 +131,8 @@ Its basic syntax is as follows:
 REP <count> {IN <select>}
 ```
 
-If a select is not specified, then the entire netmap is used as input. The resulting nodes will be used to actually store objects and they constitute a replica group (or simply, "a replica").
+If a select is not specified, then the entire netmap is used as input. The only exception to this rule is when exactly 1 replica and 1 selector are being present: in this case the only selector is being used instead of the whole netmap.
+The resulting nodes will be used to actually store objects and they constitute a replica group (or simply, "a replica").
 
 Examples
 ```sql

eacl/test/benchmark_test.go

@@ -2,7 +2,7 @@ package eacltest
 
 import (
 	"bytes"
-	"math/rand"
+	"crypto/rand"
 	"testing"
 
 	cidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id/test"

eacl/validator_test.go

@@ -1,7 +1,7 @@
 package eacl
 
 import (
-	"math/rand"
+	"crypto/rand"
 	"testing"
 
 	"github.com/stretchr/testify/require"

netmap/aggregator.go

@@ -24,6 +24,7 @@ type (
 
 	minAgg struct {
 		min      float64
+		minFound bool
 	}
 
 	meanIQRAgg struct {
@@ -102,7 +103,13 @@ func (a *meanAgg) Compute() float64 {
 }
 
 func (a *minAgg) Add(n float64) {
-	if a.min == 0 || n < a.min {
+	if !a.minFound {
+		a.min = n
+		a.minFound = true
+		return
+	}
+
+	if n < a.min {
 		a.min = n
 	}
 }

netmap/aggregator_test.go

@@ -0,0 +1,44 @@
+package netmap
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestMinAgg(t *testing.T) {
+	tests := []struct {
+		vals []float64
+		res  float64
+	}{
+		{
+			vals: []float64{1, 2, 3, 0, 10},
+			res:  0,
+		},
+		{
+			vals: []float64{10, 0, 10, 0},
+			res:  0,
+		},
+		{
+			vals: []float64{0, 1, 2, 3, 10},
+			res:  0,
+		},
+		{
+			vals: []float64{0, 0, 0, 0},
+			res:  0,
+		},
+		{
+			vals: []float64{10, 10, 10, 10},
+			res:  10,
+		},
+	}
+
+	for _, test := range tests {
+		a := newMinAgg()
+		for _, val := range test.vals {
+			a.Add(val)
+		}
+
+		require.Equal(t, test.res, a.Compute())
+	}
+}

netmap/context.go

@@ -40,6 +40,10 @@ type context struct {
 	// policy uses the UNIQUE flag. Nodes marked as used are not used in subsequent
 	// base selections.
 	usedNodes map[uint64]bool
+
+	// If true, returns an error when netmap does not contain enough nodes for selection.
+	// By default best effort is taken.
+	strict bool
 }
 
 // Various validation errors.

netmap/json_test.go

@@ -2,6 +2,7 @@ package netmap
 
 import (
 	"encoding/json"
+	"fmt"
 	"os"
 	"path/filepath"
 	"testing"
@@ -47,7 +48,8 @@ func TestPlacementPolicy_Interopability(t *testing.T) {
 	require.NoError(t, err)
 
 	for i := range ds {
-		bs, err := os.ReadFile(filepath.Join(testsDir, ds[i].Name()))
+		filename := filepath.Join(testsDir, ds[i].Name())
+		bs, err := os.ReadFile(filename)
 		require.NoError(t, err)
 
 		var tc TestCase
@@ -56,7 +58,7 @@ func TestPlacementPolicy_Interopability(t *testing.T) {
 		srcNodes := make([]NodeInfo, len(tc.Nodes))
 		copy(srcNodes, tc.Nodes)
 
-		t.Run(tc.Name, func(t *testing.T) {
+		t.Run(fmt.Sprintf("%s:%s", filename, tc.Name), func(t *testing.T) {
 			var nm NetMap
 			nm.SetNodes(tc.Nodes)
 

netmap/json_tests/hrw_sort.json

@@ -146,19 +146,19 @@
     "select 3 nodes in 3 distinct countries, same placement": {
       "policy": {"replicas":[{"count":1,"selector":"Main"}],"containerBackupFactor":1,"selectors":[{"name":"Main","count":3,"clause":"DISTINCT","attribute":"Country","filter":"*"}],"filters":[]},
       "pivot": "Y29udGFpbmVySUQ=",
-      "result": [[4, 0, 7]],
+      "result": [[0, 2, 3]],
       "placement": {
         "pivot": "b2JqZWN0SUQ=",
-        "result": [[4, 0, 7]]
+        "result": [[0, 2, 3]]
       }
     },
     "select 6 nodes in 3 distinct countries, different placement": {
       "policy": {"replicas":[{"count":1,"selector":"Main"}],"containerBackupFactor":2,"selectors":[{"name":"Main","count":3,"clause":"DISTINCT","attribute":"Country","filter":"*"}],"filters":[]},
       "pivot": "Y29udGFpbmVySUQ=",
-      "result": [[4, 3, 0, 1, 7, 2]],
+      "result": [[0, 1, 2, 6, 3, 4]],
       "placement": {
         "pivot": "b2JqZWN0SUQ=",
-        "result": [[4, 3, 0, 7, 2, 1]]
+        "result": [[0, 1, 2, 6, 3, 4]]
       }
     }
   }

netmap/json_tests/non_strict.json

@@ -0,0 +1,95 @@
+{
+  "name": "non-strict selections",
+  "comment": "These test specify loose selection behaviour, to allow fetching already PUT objects even when there is not enough nodes to select from.",
+  "nodes": [
+    {
+      "attributes": [
+        {
+          "key": "Country",
+          "value": "Russia"
+        }
+      ]
+    },
+    {
+      "attributes": [
+        {
+          "key": "Country",
+          "value": "Germany"
+        }
+      ]
+    },
+    {
+      "attributes": [ ]
+    }
+  ],
+  "tests": {
+    "not enough nodes (backup factor)": {
+      "policy": {
+        "replicas": [
+          {
+            "count": 1,
+            "selector": "MyStore"
+          }
+        ],
+        "containerBackupFactor": 2,
+        "selectors": [
+          {
+            "name": "MyStore",
+            "count": 2,
+            "clause": "DISTINCT",
+            "attribute": "Country",
+            "filter": "FromRU"
+          }
+        ],
+        "filters": [
+          {
+            "name": "FromRU",
+            "key": "Country",
+            "op": "EQ",
+            "value": "Russia",
+            "filters": [ ]
+          }
+        ]
+      },
+      "result": [
+        [
+          0
+        ]
+      ]
+    },
+    "not enough nodes (buckets)": {
+      "policy": {
+        "replicas": [
+          {
+            "count": 1,
+            "selector": "MyStore"
+          }
+        ],
+        "containerBackupFactor": 1,
+        "selectors": [
+          {
+            "name": "MyStore",
+            "count": 2,
+            "clause": "DISTINCT",
+            "attribute": "Country",
+            "filter": "FromRU"
+          }
+        ],
+        "filters": [
+          {
+            "name": "FromRU",
+            "key": "Country",
+            "op": "EQ",
+            "value": "Russia",
+            "filters": [ ]
+          }
+        ]
+      },
+      "result": [
+        [
+          0
+        ]
+      ]
+    }
+  }
+}

netmap/json_tests/rep_only.json

@@ -104,7 +104,14 @@
         "selectors": [],
         "filters": []
       },
-      "error": "not enough nodes"
+      "result": [
+        [
+          0,
+          1,
+          2,
+          3
+        ]
+      ]
     }
   }
 }

netmap/json_tests/selector_invalid.json

@@ -24,7 +24,12 @@
   "tests": {
     "missing filter": {
       "policy": {
-        "replicas": [],
+        "replicas": [
+          {
+            "count": 1,
+            "selector": "MyStore"
+          }
+        ],
         "containerBackupFactor": 1,
         "selectors": [
           {
@@ -47,9 +52,14 @@
       },
       "error": "filter not found"
     },
-    "not enough nodes (backup factor)": {
+    "not enough nodes (filter results in empty set)": {
       "policy": {
-        "replicas": [],
+        "replicas": [
+          {
+            "count": 1,
+            "selector": "MyStore"
+          }
+        ],
         "containerBackupFactor": 2,
         "selectors": [
           {
@@ -57,40 +67,15 @@
             "count": 2,
             "clause": "DISTINCT",
             "attribute": "Country",
-            "filter": "FromRU"
+            "filter": "FromMoon"
           }
         ],
         "filters": [
           {
-            "name": "FromRU",
+            "name": "FromMoon",
             "key": "Country",
             "op": "EQ",
-            "value": "Russia",
-            "filters": []
-          }
-        ]
-      },
-      "error": "not enough nodes"
-    },
-    "not enough nodes (buckets)": {
-      "policy": {
-        "replicas": [],
-        "containerBackupFactor": 1,
-        "selectors": [
-          {
-            "name": "MyStore",
-            "count": 2,
-            "clause": "DISTINCT",
-            "attribute": "Country",
-            "filter": "FromRU"
-          }
-        ],
-        "filters": [
-          {
-            "name": "FromRU",
-            "key": "Country",
-            "op": "EQ",
-            "value": "Russia",
+            "value": "Moon",
             "filters": []
           }
         ]

netmap/netmap.go

@@ -238,7 +238,7 @@ func (m NetMap) ContainerNodes(p PlacementPolicy, pivot []byte) ([][]NodeInfo, e
 	// marked as used by earlier replicas.
 	for i := range p.replicas {
 		sName := p.replicas[i].GetSelector()
-		if sName == "" {
+		if sName == "" && !(len(p.replicas) == 1 && len(p.selectors) == 1) {
 			var s netmap.Selector
 			s.SetCount(p.replicas[i].GetCount())
 			s.SetFilter(mainFilterName)
@@ -258,6 +258,9 @@ func (m NetMap) ContainerNodes(p PlacementPolicy, pivot []byte) ([][]NodeInfo, e
 		}
 
 		if p.unique {
+			if c.processedSelectors[sName] == nil {
+				return nil, fmt.Errorf("selector not found: '%s'", sName)
+			}
 			nodes, err := c.getSelection(*c.processedSelectors[sName])
 			if err != nil {
 				return nil, err

netmap/policy.go

@@ -551,7 +551,7 @@ func (p *PlacementPolicy) DecodeString(s string) error {
 		return errors.New("parsed nil value")
 	}
 
-	if err := validatePolicy(*p); err != nil {
+	if err := validatePolicy(*parsed); err != nil {
 		return fmt.Errorf("invalid policy: %w", err)
 	}
 
@@ -605,6 +605,13 @@ var (
 	errUnknownSelector = errors.New("policy: selector not found")
 	// errSyntaxError is returned for errors found by ANTLR parser.
 	errSyntaxError = errors.New("policy: syntax error")
+	// errRedundantSelector is returned for errors found by selectors policy validator.
+	errRedundantSelector = errors.New("policy: found redundant selector")
+	// errUnnamedSelector is returned for errors found by selectors policy validator.
+	errUnnamedSelector = errors.New("policy: unnamed selectors are useless, " +
+		"make sure to pair REP and SELECT clauses: \"REP .. IN X\" + \"SELECT ... AS X\"")
+	// errRedundantSelector is returned for errors found by filters policy validator.
+	errRedundantFilter = errors.New("policy: found redundant filter")
 )
 
 type policyVisitor struct {
@@ -845,25 +852,52 @@ func (p *policyVisitor) VisitExpr(ctx *parser.ExprContext) any {
 // validatePolicy checks high-level constraints such as filter link in SELECT
 // being actually defined in FILTER section.
 func validatePolicy(p PlacementPolicy) error {
+	canOmitNames := len(p.selectors) == 1 && len(p.replicas) == 1
 	seenFilters := map[string]bool{}
-
+	expectedFilters := map[string]struct{}{}
 	for i := range p.filters {
 		seenFilters[p.filters[i].GetName()] = true
+		for _, f := range p.filters[i].GetFilters() {
+			if f.GetName() != "" {
+				expectedFilters[f.GetName()] = struct{}{}
+			}
+		}
 	}
 
-	seenSelectors := map[string]bool{}
-
+	seenSelectors := map[string]*netmap.Selector{}
 	for i := range p.selectors {
-		if flt := p.selectors[i].GetFilter(); flt != mainFilterName && !seenFilters[flt] {
+		if p.selectors[i].GetName() == "" && !canOmitNames {
+			return errUnnamedSelector
+		}
+		if flt := p.selectors[i].GetFilter(); flt != mainFilterName {
+			expectedFilters[flt] = struct{}{}
+			if !seenFilters[flt] {
 				return fmt.Errorf("%w: '%s'", errUnknownFilter, flt)
 			}
-
-		seenSelectors[p.selectors[i].GetName()] = true
+		}
+		seenSelectors[p.selectors[i].GetName()] = &p.selectors[i]
 	}
 
+	for _, f := range p.filters {
+		if _, ok := expectedFilters[f.GetName()]; !ok {
+			return fmt.Errorf("%w: '%s'", errRedundantFilter, f.GetName())
+		}
+	}
+
+	expectedSelectors := map[string]struct{}{}
 	for i := range p.replicas {
-		if sel := p.replicas[i].GetSelector(); sel != "" && !seenSelectors[sel] {
-			return fmt.Errorf("%w: '%s'", errUnknownSelector, sel)
+		selName := p.replicas[i].GetSelector()
+		if selName != "" || canOmitNames {
+			expectedSelectors[selName] = struct{}{}
+			if seenSelectors[selName] == nil {
+				return fmt.Errorf("%w: '%s'", errUnknownSelector, selName)
+			}
+		}
+	}
+
+	for _, s := range p.selectors {
+		if _, ok := expectedSelectors[s.GetName()]; !ok {
+			return fmt.Errorf("%w: to use selector '%s' use keyword IN", errRedundantSelector, s.GetName())
 		}
 	}
 

netmap/policy_decode_test.go

@@ -0,0 +1,65 @@
+package netmap
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestDecodeString(t *testing.T) {
+	testCases := []string{
+		`REP 2
+CBF 2
+SELECT 2 FROM *`,
+		`REP 1 IN X
+CBF 1
+SELECT 2 IN SAME Location FROM * AS X`,
+
+		`REP 1 IN X
+REP 2 IN Y
+CBF 1
+SELECT 2 FROM * AS X
+SELECT 3 FROM * AS Y`,
+
+		`REP 1 IN X
+SELECT 2 IN City FROM Good AS X
+FILTER Country EQ RU AS FromRU
+FILTER Country EQ EN AS FromEN
+FILTER @FromRU AND @FromEN AND Rating GT 7 AS Good`,
+
+		`REP 7 IN SPB
+SELECT 1 IN City FROM SPBSSD AS SPB
+FILTER City EQ SPB AND SSD EQ true OR City EQ SPB AND Rating GE 5 AS SPBSSD`,
+
+		`REP 7 IN SPB
+SELECT 1 IN City FROM SPBSSD AS SPB
+FILTER NOT (NOT (City EQ SPB) AND SSD EQ true OR City EQ SPB AND Rating GE 5) AS SPBSSD`,
+
+		`UNIQUE
+REP 1
+REP 1`,
+	}
+
+	var p PlacementPolicy
+
+	for _, testCase := range testCases {
+		require.NoError(t, p.DecodeString(testCase), "unable parse %s", testCase)
+		var b strings.Builder
+		require.NoError(t, p.WriteStringTo(&b))
+		require.Equal(t, testCase, b.String())
+	}
+
+	invalidTestCases := map[string]error{
+		`?REP 1`:                                errSyntaxError,
+		`REP 1 trailing garbage`:                errSyntaxError,
+		`REP 1 REP 1 SELECT 4 FROM *`:           errUnnamedSelector,
+		`REP 1 SELECT 4 FROM * SELECT 1 FROM *`: errUnnamedSelector,
+		`REP 1 IN X SELECT 4 FROM *`:            errUnknownSelector,
+		`REP 1 IN X REP 2 SELECT 4 FROM * AS X FILTER 'UN-LOCODE' EQ 'RU LED' AS F`: errRedundantFilter,
+	}
+
+	for i := range invalidTestCases {
+		require.ErrorIs(t, p.DecodeString(i), invalidTestCases[i], "#%s", i)
+	}
+}

netmap/policy_test.go

@@ -1,7 +1,6 @@
 package netmap_test
 
 import (
-	"strings"
 	"testing"
 
 	. "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/netmap"
@@ -9,55 +8,6 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
-func TestEncode(t *testing.T) {
-	testCases := []string{
-		`REP 1 IN X
-CBF 1
-SELECT 2 IN SAME Location FROM * AS X`,
-
-		`REP 1
-SELECT 2 IN City FROM Good
-FILTER Country EQ RU AS FromRU
-FILTER @FromRU AND Rating GT 7 AS Good`,
-
-		`REP 7 IN SPB
-SELECT 1 IN City FROM SPBSSD AS SPB
-FILTER City EQ SPB AND SSD EQ true OR City EQ SPB AND Rating GE 5 AS SPBSSD`,
-
-		`REP 7 IN SPB
-SELECT 1 IN City FROM SPBSSD AS SPB
-FILTER NOT (NOT (City EQ SPB) AND SSD EQ true OR City EQ SPB AND Rating GE 5) AS SPBSSD`,
-
-		`UNIQUE
-REP 1
-REP 1`,
-
-		`REP 1 IN X
-SELECT 1 FROM F AS X
-FILTER 'UN-LOCODE' EQ 'RU LED' AS F`,
-	}
-
-	var p PlacementPolicy
-
-	for _, testCase := range testCases {
-		require.NoError(t, p.DecodeString(testCase))
-
-		var b strings.Builder
-		require.NoError(t, p.WriteStringTo(&b))
-
-		require.Equal(t, testCase, b.String())
-	}
-
-	invalidTestCases := []string{
-		`?REP 1`,
-		`REP 1 trailing garbage`,
-	}
-
-	for i := range invalidTestCases {
-		require.Error(t, p.DecodeString(invalidTestCases[i]), "#%d", i)
-	}
-}
-
 func TestPlacementPolicyEncoding(t *testing.T) {
 	v := netmaptest.PlacementPolicy()
 

netmap/selector.go

@@ -60,7 +60,7 @@ func (c *context) getSelection(s netmap.Selector) ([]nodes, error) {
 	bucketCount, nodesInBucket := calcNodesCount(s)
 	buckets := c.getSelectionBase(s)
 
-	if len(buckets) < bucketCount {
+	if c.strict && len(buckets) < bucketCount {
 		return nil, fmt.Errorf("%w: '%s'", errNotEnoughNodes, s.GetName())
 	}
 
@@ -96,7 +96,7 @@ func (c *context) getSelection(s netmap.Selector) ([]nodes, error) {
 	if len(res) < bucketCount {
 		// Fallback to using minimum allowed backup factor (1).
 		res = append(res, fallback...)
-		if len(res) < bucketCount {
+		if c.strict && len(res) < bucketCount {
 			return nil, fmt.Errorf("%w: '%s'", errNotEnoughNodes, s.GetName())
 		}
 	}
@@ -110,6 +110,13 @@ func (c *context) getSelection(s netmap.Selector) ([]nodes, error) {
 		hrw.SortHasherSliceByWeightValue(res, weights, c.hrwSeedHash)
 	}
 
+	if len(res) < bucketCount {
+		if len(res) == 0 {
+			return nil, errNotEnoughNodes
+		}
+		bucketCount = len(res)
+	}
+
 	if s.GetAttribute() == "" {
 		res, fallback = res[:bucketCount], res[bucketCount:]
 		for i := range fallback {

netmap/selector_test.go

@@ -1,9 +1,10 @@
 package netmap
 
 import (
+	"crypto/rand"
 	"encoding/binary"
 	"fmt"
-	"math/rand"
+	mrand "math/rand"
 	"sort"
 	"strconv"
 	"testing"
@@ -28,10 +29,10 @@ func BenchmarkHRWSort(b *testing.B) {
 		node.SetPublicKey(key)
 
 		vectors[i] = nodes{node}
-		weights[i] = float64(rand.Uint32()%10) / 10.0
+		weights[i] = float64(mrand.Uint32()%10) / 10.0
 	}
 
-	pivot := rand.Uint64()
+	pivot := mrand.Uint64()
 	b.Run("sort by index, no weight", func(b *testing.B) {
 		realNodes := make([]nodes, netmapSize)
 		b.ResetTimer()
@@ -282,6 +283,55 @@ func TestPlacementPolicy_Unique(t *testing.T) {
 	}
 }
 
+func TestPlacementPolicy_SingleOmitNames(t *testing.T) {
+	nodes := []NodeInfo{
+		nodeInfoFromAttributes("ID", "1", "Country", "Russia", "City", "SPB"),
+		nodeInfoFromAttributes("ID", "2", "Country", "Germany", "City", "Berlin"),
+		nodeInfoFromAttributes("ID", "3", "Country", "Russia", "City", "Moscow"),
+		nodeInfoFromAttributes("ID", "4", "Country", "France", "City", "Paris"),
+		nodeInfoFromAttributes("ID", "5", "Country", "France", "City", "Lyon"),
+		nodeInfoFromAttributes("ID", "6", "Country", "Russia", "City", "SPB"),
+		nodeInfoFromAttributes("ID", "7", "Country", "Russia", "City", "Moscow"),
+		nodeInfoFromAttributes("ID", "8", "Country", "Germany", "City", "Darmstadt"),
+		nodeInfoFromAttributes("ID", "9", "Country", "Germany", "City", "Frankfurt"),
+		nodeInfoFromAttributes("ID", "10", "Country", "Russia", "City", "SPB"),
+		nodeInfoFromAttributes("ID", "11", "Country", "Russia", "City", "Moscow"),
+		nodeInfoFromAttributes("ID", "12", "Country", "Germany", "City", "London"),
+	}
+	for i := range nodes {
+		pub := make([]byte, 33)
+		rand.Read(pub)
+		nodes[i].SetPublicKey(pub)
+	}
+
+	var nm NetMap
+	nm.SetNodes(nodes)
+
+	for _, unique := range []bool{false, true} {
+		t.Run(fmt.Sprintf("unique=%t", unique), func(t *testing.T) {
+			ssNamed := []Selector{newSelector("X", "City", 2, "FromRU", (*Selector).SelectDistinct)}
+			fsNamed := []Filter{newFilter("FromRU", "Country", "Russia", netmap.EQ)}
+			rsNamed := []ReplicaDescriptor{newReplica(1, "X")}
+			pNamed := newPlacementPolicy(3, rsNamed, ssNamed, fsNamed)
+			pNamed.unique = unique
+
+			vNamed, err := nm.ContainerNodes(pNamed, []byte{1})
+			require.NoError(t, err)
+
+			ssUnnamed := []Selector{newSelector("", "City", 2, "FromRU", (*Selector).SelectDistinct)}
+			fsUnnamed := []Filter{newFilter("FromRU", "Country", "Russia", netmap.EQ)}
+			rsUnnamed := []ReplicaDescriptor{newReplica(1, "")}
+			pUnnamed := newPlacementPolicy(3, rsUnnamed, ssUnnamed, fsUnnamed)
+			pUnnamed.unique = unique
+
+			vUnnamed, err := nm.ContainerNodes(pUnnamed, []byte{1})
+			require.NoError(t, err)
+
+			require.Equal(t, vNamed, vUnnamed)
+		})
+	}
+}
+
 func TestPlacementPolicy_MultiREP(t *testing.T) {
 	nodes := []NodeInfo{
 		nodeInfoFromAttributes("ID", "1", "Country", "Russia", "City", "SPB"),

netmap/test/generate.go

@@ -1,7 +1,7 @@
 package netmaptest
 
 import (
-	"math/rand"
+	"crypto/rand"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/netmap"
 )
@@ -70,7 +70,7 @@ func NetworkInfo() (x netmap.NetworkInfo) {
 // NodeInfo returns random netmap.NodeInfo.
 func NodeInfo() (x netmap.NodeInfo) {
 	key := make([]byte, 33)
-	rand.Read(key)
+	_, _ = rand.Read(key)
 
 	x.SetPublicKey(key)
 	x.SetNetworkEndpoints("1", "2", "3")

ns/nns_test.go

@@ -1,10 +1,10 @@
 package ns
 
 import (
+	"crypto/rand"
 	"errors"
 	"fmt"
 	"math/big"
-	"math/rand"
 	"strings"
 	"testing"
 

object/id/test/generate.go

@@ -1,8 +1,8 @@
 package oidtest
 
 import (
+	"crypto/rand"
 	"crypto/sha256"
-	"math/rand"
 
 	cidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id/test"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
@@ -12,7 +12,7 @@ import (
 func ID() oid.ID {
 	checksum := [sha256.Size]byte{}
 
-	rand.Read(checksum[:])
+	_, _ = rand.Read(checksum[:])
 
 	return idWithChecksum(checksum)
 }

object/search_test.go

@@ -1,8 +1,8 @@
 package object_test
 
 import (
+	"crypto/rand"
 	"crypto/sha256"
-	"math/rand"
 	"testing"
 
 	v2object "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/object"

object/tombstone_test.go

@@ -1,8 +1,8 @@
 package object
 
 import (
+	"crypto/rand"
 	"crypto/sha256"
-	"math/rand"
 	"testing"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/tombstone"

pool/cache.go

@@ -69,3 +69,7 @@ func (c *sessionCache) expired(val *cacheValue) bool {
 	// use epoch+1 (clear cache beforehand) to prevent 'expired session token' error right after epoch tick
 	return val.token.ExpiredAt(epoch + 1)
 }
+
+func (c *sessionCache) Epoch() uint64 {
+	return c.currentEpoch.Load()
+}

pool/mock_test.go

@@ -189,3 +189,7 @@ func (m *mockClient) restartIfUnhealthy(ctx context.Context) (healthy bool, chan
 	}
 	return
 }
+
+func (m *mockClient) close() error {
+	return nil
+}

pool/object_put_pool_transformer.go

@@ -0,0 +1,172 @@
+package pool
+
+import (
+	"context"
+
+	sdkClient "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client"
+	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/transformer"
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+type logger interface {
+	log(level zapcore.Level, msg string, fields ...zap.Field)
+}
+
+type PrmObjectPutClientCutInit struct {
+	PrmObjectPut
+}
+
+func (c *clientWrapper) objectPutInitTransformer(prm PrmObjectPutClientCutInit) (*objectWriterTransformer, error) {
+	cl, err := c.getClient()
+	if err != nil {
+		return nil, err
+	}
+	var w objectWriterTransformer
+
+	w.it = internalTarget{
+		client:  cl,
+		prm:     prm,
+		address: c.address(),
+		logger:  &c.clientStatusMonitor,
+	}
+
+	key := &c.prm.key
+	if prm.key != nil {
+		key = prm.key
+	}
+
+	w.ot = transformer.NewPayloadSizeLimiter(transformer.Params{
+		Key:                    key,
+		NextTargetInit:         func() transformer.ObjectWriter { return &w.it },
+		MaxSize:                prm.networkInfo.MaxObjectSize(),
+		WithoutHomomorphicHash: prm.withoutHomomorphicHash,
+		NetworkState:           prm.networkInfo,
+		SessionToken:           prm.stoken,
+	})
+	return &w, nil
+}
+
+type objectWriterTransformer struct {
+	ot  transformer.ChunkedObjectWriter
+	it  internalTarget
+	err error
+}
+
+func (x *objectWriterTransformer) WriteHeader(ctx context.Context, hdr object.Object) bool {
+	x.err = x.ot.WriteHeader(ctx, &hdr)
+	return x.err == nil
+}
+
+func (x *objectWriterTransformer) WritePayloadChunk(ctx context.Context, chunk []byte) bool {
+	_, x.err = x.ot.Write(ctx, chunk)
+	return x.err == nil
+}
+
+// ResObjectPut groups the final result values of ObjectPutInit operation.
+type ResObjectPut struct {
+	Status apistatus.Status
+	OID    oid.ID
+}
+
+// Close return non nil result in any case. If error occurred, the result contains only buffer for further reusing.
+func (x *objectWriterTransformer) Close(ctx context.Context) (*ResObjectPut, error) {
+	ai, err := x.ot.Close(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	if ai != nil && ai.ParentID != nil {
+		x.it.res.OID = *ai.ParentID
+	}
+	return &x.it.res, nil
+}
+
+type internalTarget struct {
+	client               *sdkClient.Client
+	res                  ResObjectPut
+	prm                  PrmObjectPutClientCutInit
+	useStream            bool
+	address              string
+	logger               logger
+	resolveFrostFSErrors bool
+}
+
+func (it *internalTarget) WriteObject(ctx context.Context, o *object.Object) error {
+	putSingleImplemented, err := it.tryPutSingle(ctx, o)
+	if putSingleImplemented {
+		return err
+	}
+
+	it.logger.log(zapcore.DebugLevel, "putSingle not implemented, trying put as stream", zap.String("address", it.address))
+
+	it.useStream = true
+	return it.putAsStream(ctx, o)
+}
+
+func (it *internalTarget) putAsStream(ctx context.Context, o *object.Object) error {
+	var cliPrm sdkClient.PrmObjectPutInit
+	cliPrm.SetCopiesNumberByVectors(it.prm.copiesNumber)
+	if it.prm.stoken != nil {
+		cliPrm.WithinSession(*it.prm.stoken)
+	}
+	if it.prm.key != nil {
+		cliPrm.UseKey(*it.prm.key)
+	}
+	if it.prm.btoken != nil {
+		cliPrm.WithBearerToken(*it.prm.btoken)
+	}
+
+	wrt, err := it.client.ObjectPutInit(ctx, cliPrm)
+	if err != nil {
+		return err
+	}
+	if wrt.WriteHeader(ctx, *o) {
+		wrt.WritePayloadChunk(ctx, o.Payload())
+	}
+	res, err := wrt.Close(ctx)
+	if res != nil {
+		it.res.Status = res.Status()
+		it.res.OID = res.StoredObjectID()
+	}
+	return err
+}
+
+func (it *internalTarget) tryPutSingle(ctx context.Context, o *object.Object) (bool, error) {
+	if it.useStream {
+		return false, nil
+	}
+	var cliPrm sdkClient.PrmObjectPutSingle
+	cliPrm.SetCopiesNumber(it.prm.copiesNumber)
+	cliPrm.UseKey(it.prm.key)
+	if it.prm.stoken != nil {
+		cliPrm.WithinSession(*it.prm.stoken)
+	}
+	if it.prm.btoken != nil {
+		cliPrm.WithBearerToken(*it.prm.btoken)
+	}
+	cliPrm.SetObject(o.ToV2())
+
+	res, err := it.client.ObjectPutSingle(ctx, cliPrm)
+	if err != nil && status.Code(err) == codes.Unimplemented {
+		return false, err
+	}
+
+	if err == nil {
+		id, _ := o.ID()
+		it.res = ResObjectPut{
+			Status: res.Status(),
+			OID:    id,
+		}
+		if !it.resolveFrostFSErrors && !apistatus.IsSuccessful(it.res.Status) {
+			return true, apistatus.ErrFromStatus(it.res.Status)
+		}
+		return true, nil
+	}
+	return true, err
+}

pool/pool.go

@@ -78,12 +78,16 @@ type client interface {
 	dial(ctx context.Context) error
 	// see clientWrapper.restartIfUnhealthy.
 	restartIfUnhealthy(ctx context.Context) (bool, bool)
+	// see clientWrapper.close.
+	close() error
 }
 
 // clientStatus provide access to some metrics for connection.
 type clientStatus interface {
 	// isHealthy checks if the connection can handle requests.
 	isHealthy() bool
+	// isDialed checks if the connection was created.
+	isDialed() bool
 	// setUnhealthy marks client as unhealthy.
 	setUnhealthy()
 	// address return address of endpoint.
@@ -105,7 +109,7 @@ var errPoolClientUnhealthy = errors.New("pool client unhealthy")
 type clientStatusMonitor struct {
 	logger         *zap.Logger
 	addr           string
-	healthy        *atomic.Bool
+	healthy        *atomic.Uint32
 	errorThreshold uint32
 
 	mu                sync.RWMutex // protect counters
@@ -114,6 +118,22 @@ type clientStatusMonitor struct {
 	methods           []*methodStatus
 }
 
+// values for healthy status of clientStatusMonitor.
+const (
+	// statusUnhealthyOnDial is set when dialing to the endpoint is failed,
+	// so there is no connection to the endpoint, and pool should not close it
+	// before re-establishing connection once again.
+	statusUnhealthyOnDial = iota
+
+	// statusUnhealthyOnRequest is set when communication after dialing to the
+	// endpoint is failed due to immediate or accumulated errors, connection is
+	// available and pool should close it before re-establishing connection once again.
+	statusUnhealthyOnRequest
+
+	// statusHealthy is set when connection is ready to be used by the pool.
+	statusHealthy
+)
+
 // methodStatus provide statistic for specific method.
 type methodStatus struct {
 	name string
@@ -195,8 +215,8 @@ func newClientStatusMonitor(logger *zap.Logger, addr string, errorThreshold uint
 		methods[i] = &methodStatus{name: i.String()}
 	}
 
-	healthy := new(atomic.Bool)
-	healthy.Store(true)
+	healthy := new(atomic.Uint32)
+	healthy.Store(statusHealthy)
 
 	return clientStatusMonitor{
 		logger:         logger,
@@ -252,6 +272,11 @@ func (x *wrapperPrm) setKey(key ecdsa.PrivateKey) {
 	x.key = key
 }
 
+// setLogger sets sdkClient.Client logger.
+func (x *wrapperPrm) setLogger(logger *zap.Logger) {
+	x.logger = logger
+}
+
 // setDialTimeout sets the timeout for connection to be established.
 func (x *wrapperPrm) setDialTimeout(timeout time.Duration) {
 	x.dialTimeout = timeout
@@ -317,7 +342,7 @@ func (c *clientWrapper) dial(ctx context.Context) error {
 	prmDial.SetGRPCDialOptions(c.prm.dialOptions...)
 
 	if err = cl.Dial(ctx, prmDial); err != nil {
-		c.setUnhealthy()
+		c.setUnhealthyOnDial()
 		return err
 	}
 
@@ -334,6 +359,12 @@ func (c *clientWrapper) restartIfUnhealthy(ctx context.Context) (healthy, change
 		wasHealthy = true
 	}
 
+	// if connection is dialed before, to avoid routine / connection leak,
+	// pool has to close it and then initialize once again.
+	if c.isDialed() {
+		_ = c.close()
+	}
+
 	var cl sdkClient.Client
 	var prmInit sdkClient.PrmInit
 	prmInit.SetDefaultPrivateKey(c.prm.key)
@@ -348,7 +379,7 @@ func (c *clientWrapper) restartIfUnhealthy(ctx context.Context) (healthy, change
 	prmDial.SetGRPCDialOptions(c.prm.dialOptions...)
 
 	if err := cl.Dial(ctx, prmDial); err != nil {
-		c.setUnhealthy()
+		c.setUnhealthyOnDial()
 		return false, wasHealthy
 	}
 
@@ -549,11 +580,9 @@ func (c *clientWrapper) containerSetEACL(ctx context.Context, prm PrmContainerSe
 		return err
 	}
 
-	var cliPrm sdkClient.PrmContainerSetEACL
-	cliPrm.SetTable(prm.table)
-
-	if prm.sessionSet {
-		cliPrm.WithinSession(prm.session)
+	cliPrm := sdkClient.PrmContainerSetEACL{
+		Table:   &prm.Table,
+		Session: prm.Session,
 	}
 
 	start := time.Now()
@@ -567,16 +596,19 @@ func (c *clientWrapper) containerSetEACL(ctx context.Context, prm PrmContainerSe
 		return fmt.Errorf("set eacl on client: %w", err)
 	}
 
-	if !prm.waitParamsSet {
-		prm.waitParams.setDefaults()
+	if prm.WaitParams == nil {
+		prm.WaitParams = defaultWaitParams()
+	}
+	if err := prm.WaitParams.CheckValidity(); err != nil {
+		return fmt.Errorf("invalid wait parameters: %w", err)
 	}
 
 	var cIDp *cid.ID
-	if cID, set := prm.table.CID(); set {
+	if cID, set := prm.Table.CID(); set {
 		cIDp = &cID
 	}
 
-	err = waitForEACLPresence(ctx, c, cIDp, &prm.table, &prm.waitParams)
+	err = waitForEACLPresence(ctx, c, cIDp, &prm.Table, prm.WaitParams)
 	if err = c.handleError(ctx, nil, err); err != nil {
 		return fmt.Errorf("wait eacl presence on client: %w", err)
 	}
@@ -628,6 +660,18 @@ func (c *clientWrapper) networkInfo(ctx context.Context, _ prmNetworkInfo) (netm
 
 // objectPut writes object to FrostFS.
 func (c *clientWrapper) objectPut(ctx context.Context, prm PrmObjectPut) (oid.ID, error) {
+	if prm.bufferMaxSize == 0 {
+		prm.bufferMaxSize = defaultBufferMaxSizeForPut
+	}
+
+	if prm.clientCut {
+		return c.objectPutClientCut(ctx, prm)
+	}
+
+	return c.objectPutServerCut(ctx, prm)
+}
+
+func (c *clientWrapper) objectPutServerCut(ctx context.Context, prm PrmObjectPut) (oid.ID, error) {
 	cl, err := c.getClient()
 	if err != nil {
 		return oid.ID{}, err
@@ -665,10 +709,8 @@ func (c *clientWrapper) objectPut(ctx context.Context, prm PrmObjectPut) (oid.ID
 		}
 
 		if prm.payload != nil {
-			const defaultBufferSizePut = 3 << 20 // configure?
-
-			if sz == 0 || sz > defaultBufferSizePut {
-				sz = defaultBufferSizePut
+			if sz == 0 || sz > prm.bufferMaxSize {
+				sz = prm.bufferMaxSize
 			}
 
 			buf := make([]byte, sz)
@@ -709,6 +751,73 @@ func (c *clientWrapper) objectPut(ctx context.Context, prm PrmObjectPut) (oid.ID
 	return res.StoredObjectID(), nil
 }
 
+func (c *clientWrapper) objectPutClientCut(ctx context.Context, prm PrmObjectPut) (oid.ID, error) {
+	putInitPrm := PrmObjectPutClientCutInit{
+		PrmObjectPut: prm,
+	}
+
+	start := time.Now()
+	wObj, err := c.objectPutInitTransformer(putInitPrm)
+	c.incRequests(time.Since(start), methodObjectPut)
+	if err = c.handleError(ctx, nil, err); err != nil {
+		return oid.ID{}, fmt.Errorf("init writing on API client: %w", err)
+	}
+
+	if wObj.WriteHeader(ctx, prm.hdr) {
+		sz := prm.hdr.PayloadSize()
+
+		if data := prm.hdr.Payload(); len(data) > 0 {
+			if prm.payload != nil {
+				prm.payload = io.MultiReader(bytes.NewReader(data), prm.payload)
+			} else {
+				prm.payload = bytes.NewReader(data)
+				sz = uint64(len(data))
+			}
+		}
+
+		if prm.payload != nil {
+			if sz == 0 || sz > prm.bufferMaxSize {
+				sz = prm.bufferMaxSize
+			}
+
+			buf := make([]byte, sz)
+
+			var n int
+
+			for {
+				n, err = prm.payload.Read(buf)
+				if n > 0 {
+					start = time.Now()
+					successWrite := wObj.WritePayloadChunk(ctx, buf[:n])
+					c.incRequests(time.Since(start), methodObjectPut)
+					if !successWrite {
+						break
+					}
+
+					continue
+				}
+
+				if errors.Is(err, io.EOF) {
+					break
+				}
+
+				return oid.ID{}, fmt.Errorf("read payload: %w", c.handleError(ctx, nil, err))
+			}
+		}
+	}
+
+	res, err := wObj.Close(ctx)
+	var st apistatus.Status
+	if res != nil {
+		st = res.Status
+	}
+	if err = c.handleError(ctx, st, err); err != nil { // here err already carries both status and client errors
+		return oid.ID{}, fmt.Errorf("client failure: %w", err)
+	}
+
+	return res.OID, nil
+}
+
 // objectDelete invokes sdkClient.ObjectDelete parse response status to error.
 func (c *clientWrapper) objectDelete(ctx context.Context, prm PrmObjectDelete) error {
 	cl, err := c.getClient()
@@ -716,20 +825,15 @@ func (c *clientWrapper) objectDelete(ctx context.Context, prm PrmObjectDelete) e
 		return err
 	}
 
-	var cliPrm sdkClient.PrmObjectDelete
-	cliPrm.FromContainer(prm.addr.Container())
-	cliPrm.ByID(prm.addr.Object())
+	cnr := prm.addr.Container()
+	obj := prm.addr.Object()
 
-	if prm.stoken != nil {
-		cliPrm.WithinSession(*prm.stoken)
-	}
-
-	if prm.btoken != nil {
-		cliPrm.WithBearerToken(*prm.btoken)
-	}
-
-	if prm.key != nil {
-		cliPrm.UseKey(*prm.key)
+	cliPrm := sdkClient.PrmObjectDelete{
+		BearerToken: prm.btoken,
+		Session:     prm.stoken,
+		ContainerID: &cnr,
+		ObjectID:    &obj,
+		Key:         prm.key,
 	}
 
 	start := time.Now()
@@ -752,20 +856,15 @@ func (c *clientWrapper) objectGet(ctx context.Context, prm PrmObjectGet) (ResGet
 		return ResGetObject{}, err
 	}
 
-	var cliPrm sdkClient.PrmObjectGet
-	cliPrm.FromContainer(prm.addr.Container())
-	cliPrm.ByID(prm.addr.Object())
+	prmCnr := prm.addr.Container()
+	prmObj := prm.addr.Object()
 
-	if prm.stoken != nil {
-		cliPrm.WithinSession(*prm.stoken)
-	}
-
-	if prm.btoken != nil {
-		cliPrm.WithBearerToken(*prm.btoken)
-	}
-
-	if prm.key != nil {
-		cliPrm.UseKey(*prm.key)
+	cliPrm := sdkClient.PrmObjectGet{
+		BearerToken: prm.btoken,
+		Session:     prm.stoken,
+		ContainerID: &prmCnr,
+		ObjectID:    &prmObj,
+		Key:         prm.key,
 	}
 
 	var res ResGetObject
@@ -805,23 +904,16 @@ func (c *clientWrapper) objectHead(ctx context.Context, prm PrmObjectHead) (obje
 		return object.Object{}, err
 	}
 
-	var cliPrm sdkClient.PrmObjectHead
-	cliPrm.FromContainer(prm.addr.Container())
-	cliPrm.ByID(prm.addr.Object())
-	if prm.raw {
-		cliPrm.MarkRaw()
-	}
+	prmCnr := prm.addr.Container()
+	prmObj := prm.addr.Object()
 
-	if prm.stoken != nil {
-		cliPrm.WithinSession(*prm.stoken)
-	}
-
-	if prm.btoken != nil {
-		cliPrm.WithBearerToken(*prm.btoken)
-	}
-
-	if prm.key != nil {
-		cliPrm.UseKey(*prm.key)
+	cliPrm := sdkClient.PrmObjectHead{
+		BearerToken: prm.btoken,
+		Session:     prm.stoken,
+		Raw:         prm.raw,
+		ContainerID: &prmCnr,
+		ObjectID:    &prmObj,
+		Key:         prm.key,
 	}
 
 	var obj object.Object
@@ -850,22 +942,17 @@ func (c *clientWrapper) objectRange(ctx context.Context, prm PrmObjectRange) (Re
 		return ResObjectRange{}, err
 	}
 
-	var cliPrm sdkClient.PrmObjectRange
-	cliPrm.FromContainer(prm.addr.Container())
-	cliPrm.ByID(prm.addr.Object())
-	cliPrm.SetOffset(prm.off)
-	cliPrm.SetLength(prm.ln)
+	prmCnr := prm.addr.Container()
+	prmObj := prm.addr.Object()
 
-	if prm.stoken != nil {
-		cliPrm.WithinSession(*prm.stoken)
-	}
-
-	if prm.btoken != nil {
-		cliPrm.WithBearerToken(*prm.btoken)
-	}
-
-	if prm.key != nil {
-		cliPrm.UseKey(*prm.key)
+	cliPrm := sdkClient.PrmObjectRange{
+		BearerToken: prm.btoken,
+		Session:     prm.stoken,
+		ContainerID: &prmCnr,
+		ObjectID:    &prmObj,
+		Offset:      prm.off,
+		Length:      prm.ln,
+		Key:         prm.key,
 	}
 
 	start := time.Now()
@@ -922,9 +1009,10 @@ func (c *clientWrapper) sessionCreate(ctx context.Context, prm prmCreateSession)
 		return resCreateSession{}, err
 	}
 
-	var cliPrm sdkClient.PrmSessionCreate
-	cliPrm.SetExp(prm.exp)
-	cliPrm.UseKey(prm.key)
+	cliPrm := sdkClient.PrmSessionCreate{
+		Expiration: prm.exp,
+		Key:        &prm.key,
+	}
 
 	start := time.Now()
 	res, err := cl.SessionCreate(ctx, cliPrm)
@@ -944,15 +1032,23 @@ func (c *clientWrapper) sessionCreate(ctx context.Context, prm prmCreateSession)
 }
 
 func (c *clientStatusMonitor) isHealthy() bool {
-	return c.healthy.Load()
+	return c.healthy.Load() == statusHealthy
+}
+
+func (c *clientStatusMonitor) isDialed() bool {
+	return c.healthy.Load() != statusUnhealthyOnDial
 }
 
 func (c *clientStatusMonitor) setHealthy() {
-	c.healthy.Store(true)
+	c.healthy.Store(statusHealthy)
 }
 
 func (c *clientStatusMonitor) setUnhealthy() {
-	c.healthy.Store(false)
+	c.healthy.Store(statusUnhealthyOnRequest)
+}
+
+func (c *clientStatusMonitor) setUnhealthyOnDial() {
+	c.healthy.Store(statusUnhealthyOnDial)
 }
 
 func (c *clientStatusMonitor) address() string {
@@ -971,12 +1067,20 @@ func (c *clientStatusMonitor) incErrorRate() {
 	}
 	c.mu.Unlock()
 
-	if thresholdReached && c.logger != nil {
-		c.logger.Warn("error threshold reached",
+	if thresholdReached {
+		c.log(zapcore.WarnLevel, "error threshold reached",
 			zap.String("address", c.addr), zap.Uint32("threshold", c.errorThreshold))
 	}
 }
 
+func (c *clientStatusMonitor) log(level zapcore.Level, msg string, fields ...zap.Field) {
+	if c.logger == nil {
+		return
+	}
+
+	c.logger.Log(level, msg, fields...)
+}
+
 func (c *clientStatusMonitor) currentErrorRate() uint32 {
 	c.mu.RLock()
 	defer c.mu.RUnlock()
@@ -1010,6 +1114,13 @@ func (c *clientWrapper) incRequests(elapsed time.Duration, method MethodIndex) {
 	}
 }
 
+func (c *clientWrapper) close() error {
+	if c.client != nil {
+		return c.client.Close()
+	}
+	return nil
+}
+
 func (c *clientStatusMonitor) handleError(ctx context.Context, st apistatus.Status, err error) error {
 	if err != nil {
 		if needCountError(ctx, err) {
@@ -1227,12 +1338,6 @@ func (x *WaitParams) SetPollInterval(tick time.Duration) {
 	x.PollInterval = tick
 }
 
-// Deprecated: Use defaultWaitParams() instead.
-func (x *WaitParams) setDefaults() {
-	x.Timeout = 120 * time.Second
-	x.PollInterval = 5 * time.Second
-}
-
 func defaultWaitParams() *WaitParams {
 	return &WaitParams{
 		Timeout:      120 * time.Second,
@@ -1321,6 +1426,13 @@ type PrmObjectPut struct {
 	payload io.Reader
 
 	copiesNumber []uint32
+
+	clientCut   bool
+	networkInfo netmap.NetworkInfo
+
+	withoutHomomorphicHash bool
+
+	bufferMaxSize uint64
 }
 
 // SetHeader specifies header of the object.
@@ -1345,6 +1457,32 @@ func (x *PrmObjectPut) SetCopiesNumberVector(copiesNumber []uint32) {
 	x.copiesNumber = copiesNumber
 }
 
+// SetClientCut enables client cut for objects. It means that full object is prepared on client side
+// and retrying is possible. But this leads to additional memory using for buffering object parts.
+// Buffer size for every put is MaxObjectSize value from FrostFS network.
+// There is limit for total memory allocation for in-flight request and
+// can be set by InitParameters.SetMaxClientCutMemory (default value is 1gb).
+// Put requests will fail if this limit be reached.
+func (x *PrmObjectPut) SetClientCut(clientCut bool) {
+	x.clientCut = clientCut
+}
+
+// WithoutHomomorphicHash if set to true do not use Tillich-Zémor hash for payload.
+func (x *PrmObjectPut) WithoutHomomorphicHash(v bool) {
+	x.withoutHomomorphicHash = v
+}
+
+// SetBufferMaxSize sets max buffer size to read payload.
+// This value isn't used if object size is set explicitly and less than this value.
+// Default value 3MB.
+func (x *PrmObjectPut) SetBufferMaxSize(size uint64) {
+	x.bufferMaxSize = size
+}
+
+func (x *PrmObjectPut) setNetworkInfo(ni netmap.NetworkInfo) {
+	x.networkInfo = ni
+}
+
 // PrmObjectDelete groups parameters of DeleteObject operation.
 type PrmObjectDelete struct {
 	prmCommon
@@ -1532,39 +1670,41 @@ func (x *PrmContainerEACL) SetContainerID(cnrID cid.ID) {
 
 // PrmContainerSetEACL groups parameters of SetEACL operation.
 type PrmContainerSetEACL struct {
-	table eacl.Table
+	Table eacl.Table
 
-	sessionSet bool
-	session    session.Container
+	Session *session.Container
 
-	waitParams    WaitParams
-	waitParamsSet bool
+	WaitParams *WaitParams
 }
 
 // SetTable sets structure of container's extended ACL to be used as a
 // parameter of the base client's operation.
 //
 // See git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client.PrmContainerSetEACL.SetTable.
+//
+// Deprecated: Use PrmContainerSetEACL.Table instead.
 func (x *PrmContainerSetEACL) SetTable(table eacl.Table) {
-	x.table = table
+	x.Table = table
 }
 
 // WithinSession specifies session to be used as a parameter of the base
 // client's operation.
 //
 // See git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client.PrmContainerSetEACL.WithinSession.
+//
+// Deprecated: Use PrmContainerSetEACL.Session instead.
 func (x *PrmContainerSetEACL) WithinSession(s session.Container) {
-	x.session = s
-	x.sessionSet = true
+	x.Session = &s
 }
 
 // SetWaitParams specifies timeout params to complete operation.
 // If not provided the default one will be used.
 // Panics if any of the wait params isn't positive.
+//
+// Deprecated: Use PrmContainerSetEACL.WaitParams instead.
 func (x *PrmContainerSetEACL) SetWaitParams(waitParams WaitParams) {
 	waitParams.checkForPositive()
-	x.waitParams = waitParams
-	x.waitParamsSet = true
+	x.WaitParams = &waitParams
 }
 
 // PrmBalanceGet groups parameters of Balance operation.
@@ -1638,6 +1778,8 @@ type Pool struct {
 	rebalanceParams rebalanceParameters
 	clientBuilder   clientBuilder
 	logger          *zap.Logger
+
+	maxObjectSize uint64
 }
 
 type innerPool struct {
@@ -1654,6 +1796,8 @@ const (
 	defaultHealthcheckTimeout = 4 * time.Second
 	defaultDialTimeout        = 5 * time.Second
 	defaultStreamTimeout      = 10 * time.Second
+
+	defaultBufferMaxSizeForPut = 3 * 1024 * 1024 // 3 MB
 )
 
 // NewPool creates connection pool using parameters.
@@ -1713,7 +1857,7 @@ func (p *Pool) Dial(ctx context.Context) error {
 			}
 
 			var st session.Object
-			err := initSessionForDuration(ctx, &st, clients[j], p.rebalanceParams.sessionExpirationDuration, *p.key)
+			err := initSessionForDuration(ctx, &st, clients[j], p.rebalanceParams.sessionExpirationDuration, *p.key, false)
 			if err != nil {
 				clients[j].setUnhealthy()
 				p.log(zap.WarnLevel, "failed to create frostfs session token for client",
@@ -1721,7 +1865,7 @@ func (p *Pool) Dial(ctx context.Context) error {
 				continue
 			}
 
-			_ = p.cache.Put(formCacheKey(addr, p.key), st)
+			_ = p.cache.Put(formCacheKey(addr, p.key, false), st)
 			atLeastOneHealthy = true
 		}
 		source := rand.NewSource(time.Now().UnixNano())
@@ -1742,6 +1886,12 @@ func (p *Pool) Dial(ctx context.Context) error {
 	p.closedCh = make(chan struct{})
 	p.innerPools = inner
 
+	ni, err := p.NetworkInfo(ctx)
+	if err != nil {
+		return fmt.Errorf("get network info for max object size: %w", err)
+	}
+	p.maxObjectSize = ni.MaxObjectSize()
+
 	go p.startRebalance(ctx)
 	return nil
 }
@@ -1784,6 +1934,7 @@ func fillDefaultInitParams(params *InitParameters, cache *sessionCache) {
 			var prm wrapperPrm
 			prm.setAddress(addr)
 			prm.setKey(*params.key)
+			prm.setLogger(params.logger)
 			prm.setDialTimeout(params.nodeDialTimeout)
 			prm.setStreamTimeout(params.nodeStreamTimeout)
 			prm.setErrorThreshold(params.errorThreshold)
@@ -1952,9 +2103,15 @@ func (p *innerPool) connection() (client, error) {
 	return nil, errors.New("no healthy client")
 }
 
-func formCacheKey(address string, key *ecdsa.PrivateKey) string {
+func formCacheKey(address string, key *ecdsa.PrivateKey, clientCut bool) string {
 	k := keys.PrivateKey{PrivateKey: *key}
-	return address + k.String()
+
+	stype := "server"
+	if clientCut {
+		stype = "client"
+	}
+
+	return address + stype + k.String()
 }
 
 func (p *Pool) checkSessionTokenErr(err error, address string) bool {
@@ -1970,7 +2127,7 @@ func (p *Pool) checkSessionTokenErr(err error, address string) bool {
 	return false
 }
 
-func initSessionForDuration(ctx context.Context, dst *session.Object, c client, dur uint64, ownerKey ecdsa.PrivateKey) error {
+func initSessionForDuration(ctx context.Context, dst *session.Object, c client, dur uint64, ownerKey ecdsa.PrivateKey, clientCut bool) error {
 	ni, err := c.networkInfo(ctx, prmNetworkInfo{})
 	if err != nil {
 		return err
@@ -1988,24 +2145,26 @@ func initSessionForDuration(ctx context.Context, dst *session.Object, c client,
 	prm.setExp(exp)
 	prm.useKey(ownerKey)
 
+	var (
+		id  uuid.UUID
+		key frostfsecdsa.PublicKey
+	)
+
+	if clientCut {
+		id = uuid.New()
+		key = frostfsecdsa.PublicKey(ownerKey.PublicKey)
+	} else {
 		res, err := c.sessionCreate(ctx, prm)
 		if err != nil {
 			return err
 		}
-
-	var id uuid.UUID
-
-	err = id.UnmarshalBinary(res.id)
-	if err != nil {
+		if err = id.UnmarshalBinary(res.id); err != nil {
 			return fmt.Errorf("invalid session token ID: %w", err)
 		}
-
-	var key frostfsecdsa.PublicKey
-
-	err = key.Decode(res.sessionKey)
-	if err != nil {
+		if err = key.Decode(res.sessionKey); err != nil {
 			return fmt.Errorf("invalid public session key: %w", err)
 		}
+	}
 
 	dst.SetID(id)
 	dst.SetAuthKey(&key)
@@ -2030,6 +2189,8 @@ type callContext struct {
 	sessionCnr     cid.ID
 	sessionObjSet  bool
 	sessionObjs    []oid.ID
+
+	sessionClientCut bool
 }
 
 func (p *Pool) initCallContext(ctx *callContext, cfg prmCommon, prmCtx prmContext) error {
@@ -2066,12 +2227,12 @@ func (p *Pool) initCallContext(ctx *callContext, cfg prmCommon, prmCtx prmContex
 // opens new session or uses cached one.
 // Must be called only on initialized callContext with set sessionTarget.
 func (p *Pool) openDefaultSession(ctx context.Context, cc *callContext) error {
-	cacheKey := formCacheKey(cc.endpoint, cc.key)
+	cacheKey := formCacheKey(cc.endpoint, cc.key, cc.sessionClientCut)
 
 	tok, ok := p.cache.Get(cacheKey)
 	if !ok {
 		// init new session
-		err := initSessionForDuration(ctx, &tok, cc.client, p.stokenDuration, *cc.key)
+		err := initSessionForDuration(ctx, &tok, cc.client, p.stokenDuration, *cc.key, cc.sessionClientCut)
 		if err != nil {
 			return fmt.Errorf("session API client: %w", err)
 		}
@@ -2136,6 +2297,7 @@ func (p *Pool) PutObject(ctx context.Context, prm PrmObjectPut) (oid.ID, error)
 	p.fillAppropriateKey(&prm.prmCommon)
 
 	var ctxCall callContext
+	ctxCall.sessionClientCut = prm.clientCut
 	if err := p.initCallContext(&ctxCall, prm.prmCommon, prmCtx); err != nil {
 		return oid.ID{}, fmt.Errorf("init call context: %w", err)
 	}
@@ -2147,6 +2309,13 @@ func (p *Pool) PutObject(ctx context.Context, prm PrmObjectPut) (oid.ID, error)
 		}
 	}
 
+	if prm.clientCut {
+		var ni netmap.NetworkInfo
+		ni.SetCurrentEpoch(p.cache.Epoch())
+		ni.SetMaxObjectSize(p.maxObjectSize) // we want to use initial max object size in PayloadSizeLimiter
+		prm.setNetworkInfo(ni)
+	}
+
 	id, err := ctxCall.client.objectPut(ctx, prm)
 	if err != nil {
 		// removes session token from cache in case of token error
@@ -2638,6 +2807,15 @@ func (p *Pool) NetworkInfo(ctx context.Context) (netmap.NetworkInfo, error) {
 func (p *Pool) Close() {
 	p.cancel()
 	<-p.closedCh
+
+	// close all clients
+	for _, pools := range p.innerPools {
+		for _, cli := range pools.clients {
+			if cli.isDialed() {
+				_ = cli.close()
+			}
+		}
+	}
 }
 
 // SyncContainerWithNetwork applies network configuration received via

pool/pool_test.go

@@ -106,7 +106,7 @@ func TestBuildPoolOneNodeFailed(t *testing.T) {
 		if err != nil {
 			return false
 		}
-		st, _ := clientPool.cache.Get(formCacheKey(cp.address(), clientPool.key))
+		st, _ := clientPool.cache.Get(formCacheKey(cp.address(), clientPool.key, false))
 		return st.AssertAuthKey(&expectedAuthKey)
 	}
 	require.Never(t, condition, 900*time.Millisecond, 100*time.Millisecond)
@@ -141,7 +141,7 @@ func TestOneNode(t *testing.T) {
 
 	cp, err := pool.connection()
 	require.NoError(t, err)
-	st, _ := pool.cache.Get(formCacheKey(cp.address(), pool.key))
+	st, _ := pool.cache.Get(formCacheKey(cp.address(), pool.key, false))
 	expectedAuthKey := frostfsecdsa.PublicKey(key1.PublicKey)
 	require.True(t, st.AssertAuthKey(&expectedAuthKey))
 }
@@ -171,7 +171,7 @@ func TestTwoNodes(t *testing.T) {
 
 	cp, err := pool.connection()
 	require.NoError(t, err)
-	st, _ := pool.cache.Get(formCacheKey(cp.address(), pool.key))
+	st, _ := pool.cache.Get(formCacheKey(cp.address(), pool.key, false))
 	require.True(t, assertAuthKeyForAny(st, clientKeys))
 }
 
@@ -226,7 +226,7 @@ func TestOneOfTwoFailed(t *testing.T) {
 	for i := 0; i < 5; i++ {
 		cp, err := pool.connection()
 		require.NoError(t, err)
-		st, _ := pool.cache.Get(formCacheKey(cp.address(), pool.key))
+		st, _ := pool.cache.Get(formCacheKey(cp.address(), pool.key, false))
 		require.True(t, assertAuthKeyForAny(st, clientKeys))
 	}
 }
@@ -296,7 +296,7 @@ func TestSessionCache(t *testing.T) {
 	// cache must contain session token
 	cp, err := pool.connection()
 	require.NoError(t, err)
-	st, _ := pool.cache.Get(formCacheKey(cp.address(), pool.key))
+	st, _ := pool.cache.Get(formCacheKey(cp.address(), pool.key, false))
 	require.True(t, st.AssertAuthKey(&expectedAuthKey))
 
 	var prm PrmObjectGet
@@ -309,7 +309,7 @@ func TestSessionCache(t *testing.T) {
 	// cache must not contain session token
 	cp, err = pool.connection()
 	require.NoError(t, err)
-	_, ok := pool.cache.Get(formCacheKey(cp.address(), pool.key))
+	_, ok := pool.cache.Get(formCacheKey(cp.address(), pool.key, false))
 	require.False(t, ok)
 
 	var prm2 PrmObjectPut
@@ -321,7 +321,7 @@ func TestSessionCache(t *testing.T) {
 	// cache must contain session token
 	cp, err = pool.connection()
 	require.NoError(t, err)
-	st, _ = pool.cache.Get(formCacheKey(cp.address(), pool.key))
+	st, _ = pool.cache.Get(formCacheKey(cp.address(), pool.key, false))
 	require.True(t, st.AssertAuthKey(&expectedAuthKey))
 }
 
@@ -365,7 +365,7 @@ func TestPriority(t *testing.T) {
 	firstNode := func() bool {
 		cp, err := pool.connection()
 		require.NoError(t, err)
-		st, _ := pool.cache.Get(formCacheKey(cp.address(), pool.key))
+		st, _ := pool.cache.Get(formCacheKey(cp.address(), pool.key, false))
 		return st.AssertAuthKey(&expectedAuthKey1)
 	}
 
@@ -373,7 +373,7 @@ func TestPriority(t *testing.T) {
 	secondNode := func() bool {
 		cp, err := pool.connection()
 		require.NoError(t, err)
-		st, _ := pool.cache.Get(formCacheKey(cp.address(), pool.key))
+		st, _ := pool.cache.Get(formCacheKey(cp.address(), pool.key, false))
 		return st.AssertAuthKey(&expectedAuthKey2)
 	}
 	require.Never(t, secondNode, time.Second, 200*time.Millisecond)
@@ -410,7 +410,7 @@ func TestSessionCacheWithKey(t *testing.T) {
 	// cache must contain session token
 	cp, err := pool.connection()
 	require.NoError(t, err)
-	st, _ := pool.cache.Get(formCacheKey(cp.address(), pool.key))
+	st, _ := pool.cache.Get(formCacheKey(cp.address(), pool.key, false))
 	require.True(t, st.AssertAuthKey(&expectedAuthKey))
 
 	var prm PrmObjectDelete
@@ -420,7 +420,7 @@ func TestSessionCacheWithKey(t *testing.T) {
 
 	err = pool.DeleteObject(ctx, prm)
 	require.NoError(t, err)
-	st, _ = pool.cache.Get(formCacheKey(cp.address(), anonKey))
+	st, _ = pool.cache.Get(formCacheKey(cp.address(), anonKey, false))
 	require.True(t, st.AssertAuthKey(&expectedAuthKey))
 }
 
@@ -523,6 +523,44 @@ func TestStatusMonitor(t *testing.T) {
 
 	require.Equal(t, uint64(count), monitor.overallErrorRate())
 	require.Equal(t, uint32(1), monitor.currentErrorRate())
+
+	t.Run("healthy status", func(t *testing.T) {
+		cases := []struct {
+			action      func(*clientStatusMonitor)
+			status      uint32
+			isDialed    bool
+			isHealthy   bool
+			description string
+		}{
+			{
+				action:      func(m *clientStatusMonitor) { m.setUnhealthyOnDial() },
+				status:      statusUnhealthyOnDial,
+				isDialed:    false,
+				isHealthy:   false,
+				description: "set unhealthy on dial",
+			},
+			{
+				action:      func(m *clientStatusMonitor) { m.setUnhealthy() },
+				status:      statusUnhealthyOnRequest,
+				isDialed:    true,
+				isHealthy:   false,
+				description: "set unhealthy on request",
+			},
+			{
+				action:      func(m *clientStatusMonitor) { m.setHealthy() },
+				status:      statusHealthy,
+				isDialed:    true,
+				isHealthy:   true,
+				description: "set healthy",
+			},
+		}
+		for _, tc := range cases {
+			tc.action(&monitor)
+			require.Equal(t, tc.status, monitor.healthy.Load())
+			require.Equal(t, tc.isDialed, monitor.isDialed())
+			require.Equal(t, tc.isHealthy, monitor.isHealthy())
+		}
+	})
 }
 
 func TestHandleError(t *testing.T) {

pool/tree/client.go

@@ -3,6 +3,7 @@ package tree
 import (
 	"context"
 	"crypto/tls"
+	"errors"
 	"fmt"
 	"sync"
 
@@ -22,6 +23,11 @@ type treeClient struct {
 	healthy bool
 }
 
+var (
+	// ErrUnhealthyEndpoint is returned when client in the pool considered unavailable.
+	ErrUnhealthyEndpoint = errors.New("unhealthy endpoint")
+)
+
 // newTreeClient creates new tree client with auto dial.
 func newTreeClient(addr string, opts ...grpc.DialOption) *treeClient {
 	return &treeClient{
@@ -102,7 +108,7 @@ func (c *treeClient) serviceClient() (grpcService.TreeServiceClient, error) {
 	defer c.mu.RUnlock()
 
 	if c.conn == nil || !c.healthy {
-		return nil, fmt.Errorf("unhealthy endpoint: '%s'", c.address)
+		return nil, fmt.Errorf("%w: '%s'", ErrUnhealthyEndpoint, c.address)
 	}
 
 	return c.service, nil

pool/tree/pool.go

@@ -32,6 +32,9 @@ var (
 
 	// ErrNodeAccessDenied is returned from Tree service in case of access denied error.
 	ErrNodeAccessDenied = errors.New("access denied")
+
+	// errNodeEmpty is used to trigger retry when 'GetNodeByPath' return empty result.
+	errNodeEmptyResult = errors.New("empty result")
 )
 
 // client represents virtual connection to the single FrostFS tree service from which Pool is formed.
@@ -296,8 +299,15 @@ func (p *Pool) GetNodes(ctx context.Context, prm GetNodesParams) ([]*grpcService
 	var resp *grpcService.GetNodeByPathResponse
 	if err := p.requestWithRetry(func(client grpcService.TreeServiceClient) (inErr error) {
 		resp, inErr = client.GetNodeByPath(ctx, request)
+		// Pool wants to do retry 'GetNodeByPath' request if result is empty.
+		// Empty result is expected due to delayed tree service sync.
+		// Return an error there to trigger retry and ignore it after,
+		// to keep compatibility with 'GetNodeByPath' implementation.
+		if inErr == nil && len(resp.Body.Nodes) == 0 {
+			return errNodeEmptyResult
+		}
 		return handleError("failed to get node by path", inErr)
-	}); err != nil {
+	}); err != nil && !errors.Is(err, errNodeEmptyResult) {
 		return nil, err
 	}
 
@@ -720,7 +730,7 @@ func (p *Pool) setStartIndices(i, j int) {
 
 func (p *Pool) requestWithRetry(fn func(client grpcService.TreeServiceClient) error) error {
 	var (
-		err error
+		err, finErr error
 		cl          grpcService.TreeServiceClient
 	)
 
@@ -740,16 +750,44 @@ func (p *Pool) requestWithRetry(fn func(client grpcService.TreeServiceClient) er
 				}
 				return err
 			}
+			finErr = finalError(finErr, err)
 			p.log(zap.DebugLevel, "tree request error", zap.String("address", p.innerPools[indexI].clients[indexJ].endpoint()), zap.Error(err))
 		}
 		startJ = 0
 	}
 
-	return err
+	return finErr
 }
 
 func shouldTryAgain(err error) bool {
-	return !(err == nil ||
-		errors.Is(err, ErrNodeNotFound) ||
-		errors.Is(err, ErrNodeAccessDenied))
+	return !(err == nil || errors.Is(err, ErrNodeAccessDenied))
+}
+
+func prioErr(err error) int {
+	switch {
+	case err == nil:
+		return -1
+	case errors.Is(err, ErrNodeAccessDenied):
+		return 100
+	case errors.Is(err, ErrNodeNotFound) ||
+		errors.Is(err, errNodeEmptyResult):
+		return 200
+	case errors.Is(err, ErrUnhealthyEndpoint):
+		return 300
+	default:
+		return 500
+	}
+}
+
+func finalError(current, candidate error) error {
+	if current == nil || candidate == nil {
+		return candidate
+	}
+
+	// lower priority error is more desirable
+	if prioErr(candidate) < prioErr(current) {
+		return candidate
+	}
+
+	return current
 }

pool/tree/pool_test.go

@@ -156,6 +156,43 @@ func TestRetry(t *testing.T) {
 		require.NoError(t, err)
 		checkIndicesAndReset(t, p, 0, 0)
 	})
+
+	t.Run("error empty result", func(t *testing.T) {
+		errNodes, index := 2, 0
+		err := p.requestWithRetry(func(client grpcService.TreeServiceClient) error {
+			if index < errNodes {
+				index++
+				return errNodeEmptyResult
+			}
+			return nil
+		})
+		require.NoError(t, err)
+		checkIndicesAndReset(t, p, 0, errNodes)
+	})
+
+	t.Run("error not found", func(t *testing.T) {
+		errNodes, index := 2, 0
+		err := p.requestWithRetry(func(client grpcService.TreeServiceClient) error {
+			if index < errNodes {
+				index++
+				return ErrNodeNotFound
+			}
+			return nil
+		})
+		require.NoError(t, err)
+		checkIndicesAndReset(t, p, 0, errNodes)
+	})
+
+	t.Run("error access denied", func(t *testing.T) {
+		var index int
+		err := p.requestWithRetry(func(client grpcService.TreeServiceClient) error {
+			index++
+			return ErrNodeAccessDenied
+		})
+		require.ErrorIs(t, err, ErrNodeAccessDenied)
+		require.Equal(t, 1, index)
+		checkIndicesAndReset(t, p, 0, 0)
+	})
 }
 
 func TestRebalance(t *testing.T) {

session/container_test.go

@@ -1,9 +1,10 @@
 package session_test
 
 import (
+	"crypto/rand"
 	"fmt"
 	"math"
-	"math/rand"
+	mrand "math/rand"
 	"testing"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs"
@@ -396,7 +397,7 @@ func TestContainer_AppliedTo(t *testing.T) {
 func TestContainer_InvalidAt(t *testing.T) {
 	var x session.Container
 
-	nbf := rand.Uint64()
+	nbf := mrand.Uint64()
 	if nbf == math.MaxUint64 {
 		nbf--
 	}

user/id_test.go

@@ -1,7 +1,7 @@
 package user_test
 
 import (
-	"math/rand"
+	"crypto/rand"
 	"testing"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs"