[#1307] object: Implement Patch method

Signed-off-by: Airat Arifullin <a.arifullin@yadro.com>
This commit is contained in:
Airat Arifullin 2024-08-12 17:11:10 +03:00 committed by Evgenii Stratonikov
parent a4a1c3f18b
commit e890f1b4b1
19 changed files with 430 additions and 81 deletions

View file

@ -74,7 +74,7 @@ func (s *objectSvc) Put() (objectService.PutObjectStream, error) {
return s.put.Put()
}
func (s *objectSvc) Patch() (objectService.PatchObjectstream, error) {
func (s *objectSvc) Patch() (objectService.PatchObjectStream, error) {
return s.patch.Patch()
}

View file

@ -249,24 +249,8 @@ func (b Service) Put() (object.PutObjectStream, error) {
}, err
}
type patchStreamBasicChecker struct {
next object.PatchObjectstream
}
func (p patchStreamBasicChecker) Send(ctx context.Context, request *objectV2.PatchRequest) error {
return p.next.Send(ctx, request)
}
func (p patchStreamBasicChecker) CloseAndRecv(ctx context.Context) (*objectV2.PatchResponse, error) {
return p.next.CloseAndRecv(ctx)
}
func (b Service) Patch() (object.PatchObjectstream, error) {
streamer, err := b.next.Patch()
return &patchStreamBasicChecker{
next: streamer,
}, err
func (b Service) Patch() (object.PatchObjectStream, error) {
return b.next.Patch()
}
func (b Service) Head(

View file

@ -174,7 +174,7 @@ func isOwnerFromKey(id user.ID, key *keys.PublicKey) bool {
func assertVerb(tok sessionSDK.Object, op acl.Op) bool {
switch op {
case acl.OpObjectPut:
return tok.AssertVerb(sessionSDK.VerbObjectPut, sessionSDK.VerbObjectDelete)
return tok.AssertVerb(sessionSDK.VerbObjectPut, sessionSDK.VerbObjectDelete, sessionSDK.VerbObjectPatch)
case acl.OpObjectDelete:
return tok.AssertVerb(sessionSDK.VerbObjectDelete)
case acl.OpObjectGet:
@ -185,11 +185,13 @@ func assertVerb(tok sessionSDK.Object, op acl.Op) bool {
sessionSDK.VerbObjectGet,
sessionSDK.VerbObjectDelete,
sessionSDK.VerbObjectRange,
sessionSDK.VerbObjectRangeHash)
sessionSDK.VerbObjectRangeHash,
sessionSDK.VerbObjectPatch,
)
case acl.OpObjectSearch:
return tok.AssertVerb(sessionSDK.VerbObjectSearch, sessionSDK.VerbObjectDelete)
case acl.OpObjectRange:
return tok.AssertVerb(sessionSDK.VerbObjectRange, sessionSDK.VerbObjectRangeHash)
return tok.AssertVerb(sessionSDK.VerbObjectRange, sessionSDK.VerbObjectRangeHash, sessionSDK.VerbObjectPatch)
case acl.OpObjectHash:
return tok.AssertVerb(sessionSDK.VerbObjectRangeHash)
}

View file

@ -518,7 +518,22 @@ func TestAPECheck_BearerTokenOverrides(t *testing.T) {
ls := inmemory.NewInmemoryLocalStorage()
ms := inmemory.NewInmemoryMorphRuleChainStorage()
checker := NewChecker(ls, ms, headerProvider, frostfsidProvider, nil, &stMock{}, nil, nil)
node1Key, err := keys.NewPrivateKey()
require.NoError(t, err)
node1 := netmapSDK.NodeInfo{}
node1.SetPublicKey(node1Key.PublicKey().Bytes())
netmap := &netmapSDK.NetMap{}
netmap.SetEpoch(100)
netmap.SetNodes([]netmapSDK.NodeInfo{node1})
nm := &netmapStub{
currentEpoch: 100,
netmaps: map[uint64]*netmapSDK.NetMap{
100: netmap,
},
}
checker := NewChecker(ls, ms, headerProvider, frostfsidProvider, nm, &stMock{}, nil, nil)
prm := Prm{
Method: method,
@ -541,7 +556,7 @@ func TestAPECheck_BearerTokenOverrides(t *testing.T) {
}
}
err := checker.CheckAPE(context.Background(), prm)
err = checker.CheckAPE(context.Background(), prm)
if test.expectAPEErr {
require.Error(t, err)
} else {

View file

@ -204,24 +204,8 @@ func (c *Service) Put() (objectSvc.PutObjectStream, error) {
}, err
}
type patchStreamBasicChecker struct {
next objectSvc.PatchObjectstream
}
func (p *patchStreamBasicChecker) Send(ctx context.Context, request *objectV2.PatchRequest) error {
return p.next.Send(ctx, request)
}
func (p patchStreamBasicChecker) CloseAndRecv(ctx context.Context) (*objectV2.PatchResponse, error) {
return p.next.CloseAndRecv(ctx)
}
func (c *Service) Patch() (objectSvc.PatchObjectstream, error) {
streamer, err := c.next.Patch()
return &patchStreamBasicChecker{
next: streamer,
}, err
func (c *Service) Patch() (objectSvc.PatchObjectStream, error) {
return c.next.Patch()
}
func (c *Service) Head(ctx context.Context, request *objectV2.HeadRequest) (*objectV2.HeadResponse, error) {

View file

@ -172,16 +172,18 @@ func (a *auditPutStream) Send(ctx context.Context, req *object.PutRequest) error
}
type auditPatchStream struct {
stream PatchObjectstream
stream PatchObjectStream
log *logger.Logger
failed bool
key []byte
containerID *refs.ContainerID
objectID *refs.ObjectID
nonFirstSend bool
}
func (a *auditService) Patch() (PatchObjectstream, error) {
func (a *auditService) Patch() (PatchObjectStream, error) {
res, err := a.next.Patch()
if !a.enabled.Load() {
return res, err
@ -196,7 +198,7 @@ func (a *auditService) Patch() (PatchObjectstream, error) {
}, nil
}
// CloseAndRecv implements PutObjectStream.
// CloseAndRecv implements PatchObjectStream.
func (a *auditPatchStream) CloseAndRecv(ctx context.Context) (*object.PatchResponse, error) {
resp, err := a.stream.CloseAndRecv(ctx)
if err != nil {
@ -209,11 +211,14 @@ func (a *auditPatchStream) CloseAndRecv(ctx context.Context) (*object.PatchRespo
return resp, err
}
// Send implements PutObjectStream.
// Send implements PatchObjectStream.
func (a *auditPatchStream) Send(ctx context.Context, req *object.PatchRequest) error {
if !a.nonFirstSend {
a.containerID = req.GetBody().GetAddress().GetContainerID()
a.objectID = req.GetBody().GetAddress().GetObjectID()
a.key = req.GetVerificationHeader().GetBodySignature().GetKey()
a.nonFirstSend = true
}
err := a.stream.Send(ctx, req)
if err != nil {

View file

@ -48,7 +48,7 @@ func (x *Common) Put() (PutObjectStream, error) {
return x.nextHandler.Put()
}
func (x *Common) Patch() (PatchObjectstream, error) {
func (x *Common) Patch() (PatchObjectStream, error) {
if x.state.IsMaintenance() {
return nil, new(apistatus.NodeUnderMaintenance)
}

View file

@ -124,6 +124,10 @@ func (p *commonPrm) SetRequestForwarder(f RequestForwarder) {
p.forwarder = f
}
func (p *commonPrm) SetSignerKey(signerKey *ecdsa.PrivateKey) {
p.signerKey = signerKey
}
// WithAddress sets object address to be read.
func (p *commonPrm) WithAddress(addr oid.Address) {
p.addr = addr

View file

@ -28,7 +28,7 @@ type (
}
patchStreamMetric struct {
stream PatchObjectstream
stream PatchObjectStream
metrics MetricRegister
start time.Time
}
@ -82,7 +82,7 @@ func (m MetricCollector) Put() (PutObjectStream, error) {
return m.next.Put()
}
func (m MetricCollector) Patch() (PatchObjectstream, error) {
func (m MetricCollector) Patch() (PatchObjectStream, error) {
if m.enabled {
t := time.Now()
@ -214,7 +214,7 @@ func (s putStreamMetric) CloseAndRecv(ctx context.Context) (*object.PutResponse,
return res, err
}
func (s patchStreamMetric) Send(ctx context.Context, req *object.PatchRequest) error {
s.metrics.AddPayloadSize("Patch", len(req.GetBody().GetPatch().Chunk))
s.metrics.AddPayloadSize("Patch", len(req.GetBody().GetPatch().GetChunk()))
return s.stream.Send(ctx, req)
}

View file

@ -0,0 +1,63 @@
package patchsvc
import (
"context"
"crypto/ecdsa"
"io"
getsvc "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/get"
objectUtil "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/util"
objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
patcherSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/patcher"
)
func (p *pipeChunkWriter) WriteChunk(_ context.Context, chunk []byte) error {
_, err := p.wr.Write(chunk)
return err
}
type rangeProvider struct {
getSvc *getsvc.Service
addr oid.Address
commonPrm *objectUtil.CommonPrm
localNodeKey *ecdsa.PrivateKey
}
var _ patcherSDK.RangeProvider = (*rangeProvider)(nil)
func (r *rangeProvider) GetRange(ctx context.Context, rng *objectSDK.Range) io.Reader {
pipeReader, pipeWriter := io.Pipe()
var rngPrm getsvc.RangePrm
rngPrm.SetSignerKey(r.localNodeKey)
rngPrm.SetCommonParameters(r.commonPrm)
rngPrm.WithAddress(r.addr)
rngPrm.SetChunkWriter(&pipeChunkWriter{
wr: pipeWriter,
})
rngPrm.SetRange(rng)
getRangeErr := make(chan error)
go func() {
defer pipeWriter.Close()
select {
case <-ctx.Done():
pipeWriter.CloseWithError(ctx.Err())
case err := <-getRangeErr:
pipeWriter.CloseWithError(err)
}
}()
go func() {
getRangeErr <- r.getSvc.GetRange(ctx, rngPrm)
}()
return pipeReader
}

View file

@ -9,14 +9,36 @@ import (
// Service implements Put operation of Object service v2.
type Service struct {
keyStorage *util.KeyStorage
getSvc *getsvc.Service
putSvc *putsvc.Service
}
// NewService constructs Service instance from provided options.
func NewService(_ *util.KeyStorage, _ *getsvc.Service, _ *putsvc.Service) *Service {
return &Service{}
func NewService(ks *util.KeyStorage, getSvc *getsvc.Service, putSvc *putsvc.Service) *Service {
return &Service{
keyStorage: ks,
getSvc: getSvc,
putSvc: putSvc,
}
}
// Put calls internal service and returns v2 object streamer.
func (s *Service) Patch() (object.PatchObjectstream, error) {
return &Streamer{}, nil
func (s *Service) Patch() (object.PatchObjectStream, error) {
nodeKey, err := s.keyStorage.GetKey(nil)
if err != nil {
return nil, err
}
return &Streamer{
getSvc: s.getSvc,
putSvc: s.putSvc,
localNodeKey: nodeKey,
}, nil
}

View file

@ -2,27 +2,220 @@ package patchsvc
import (
"context"
"crypto/ecdsa"
"errors"
"fmt"
"io"
"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/object"
objectV2 "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/object"
refsV2 "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs"
getsvc "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/get"
putsvc "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/put"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/util"
"git.frostfs.info/TrueCloudLab/frostfs-observability/tracing"
objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/patcher"
)
// Streamer for the patch handler is a pipeline that merges two incoming
// streams of patches and original object payload chunks.
// The merged result is fed to Put stream target.
type Streamer struct{}
// Streamer for the patch handler is a pipeline that merges two incoming streams of patches
// and original object payload chunks. The merged result is fed to Put stream target.
type Streamer struct {
// Patcher must be initialized at first Streamer.Send call.
patcher patcher.PatchApplier
func (s *Streamer) Send(ctx context.Context, _ *object.PatchRequest) error {
_, span := tracing.StartSpanFromContext(ctx, "patch.streamer.Send")
nonFirstSend bool
getSvc *getsvc.Service
putSvc *putsvc.Service
localNodeKey *ecdsa.PrivateKey
}
type pipeChunkWriter struct {
wr *io.PipeWriter
}
type headResponseWriter struct {
body *objectV2.HeadResponseBody
}
func (w *headResponseWriter) WriteHeader(_ context.Context, hdr *objectSDK.Object) error {
w.body.SetHeaderPart(toFullObjectHeader(hdr))
return nil
}
func toFullObjectHeader(hdr *objectSDK.Object) objectV2.GetHeaderPart {
obj := hdr.ToV2()
hs := new(objectV2.HeaderWithSignature)
hs.SetHeader(obj.GetHeader())
hs.SetSignature(obj.GetSignature())
return hs
}
func (s *Streamer) init(ctx context.Context, req *objectV2.PatchRequest) error {
hdrWithSig, addr, err := s.readHeader(ctx, req)
if err != nil {
return err
}
commonPrm, err := util.CommonPrmFromV2(req)
if err != nil {
return err
}
commonPrm.WithLocalOnly(false)
rangeProvider := &rangeProvider{
getSvc: s.getSvc,
addr: addr,
commonPrm: commonPrm,
localNodeKey: s.localNodeKey,
}
putstm, err := s.putSvc.Put()
if err != nil {
return err
}
hdr := hdrWithSig.GetHeader()
oV2 := new(objectV2.Object)
hV2 := new(objectV2.Header)
oV2.SetHeader(hV2)
oV2.GetHeader().SetContainerID(hdr.GetContainerID())
oV2.GetHeader().SetPayloadLength(hdr.GetPayloadLength())
oV2.GetHeader().SetAttributes(hdr.GetAttributes())
ownerID, err := newOwnerID(req.GetVerificationHeader())
if err != nil {
return err
}
oV2.GetHeader().SetOwnerID(ownerID)
prm, err := s.putInitPrm(req, oV2)
if err != nil {
return err
}
err = putstm.Init(ctx, prm)
if err != nil {
return err
}
patcherPrm := patcher.Params{
Header: objectSDK.NewFromV2(oV2),
RangeProvider: rangeProvider,
ObjectWriter: putstm.Target(),
}
s.patcher = patcher.New(patcherPrm)
return nil
}
func (s *Streamer) readHeader(ctx context.Context, req *objectV2.PatchRequest) (hdrWithSig *objectV2.HeaderWithSignature, addr oid.Address, err error) {
addrV2 := req.GetBody().GetAddress()
if addrV2 == nil {
err = errors.New("patch request has nil-address")
return
}
if err = addr.ReadFromV2(*addrV2); err != nil {
err = fmt.Errorf("read address error: %w", err)
return
}
commonPrm, err := util.CommonPrmFromV2(req)
if err != nil {
return
}
commonPrm.WithLocalOnly(false)
var p getsvc.HeadPrm
p.SetSignerKey(s.localNodeKey)
p.SetCommonParameters(commonPrm)
resp := new(objectV2.HeadResponse)
resp.SetBody(new(objectV2.HeadResponseBody))
p.WithAddress(addr)
p.SetHeaderWriter(&headResponseWriter{
body: resp.GetBody(),
})
err = s.getSvc.Head(ctx, p)
if err != nil {
err = fmt.Errorf("get header error: %w", err)
return
}
var ok bool
hdrPart := resp.GetBody().GetHeaderPart()
if hdrWithSig, ok = hdrPart.(*objectV2.HeaderWithSignature); !ok {
err = fmt.Errorf("unexpected header type: %T", hdrPart)
}
return
}
func (s *Streamer) Send(ctx context.Context, req *objectV2.PatchRequest) error {
ctx, span := tracing.StartSpanFromContext(ctx, "patch.streamer.Send")
defer span.End()
defer func() {
s.nonFirstSend = true
}()
if !s.nonFirstSend {
if err := s.init(ctx, req); err != nil {
return fmt.Errorf("streamer init error: %w", err)
}
}
patch := new(objectSDK.Patch)
patch.FromV2(req.GetBody())
if !s.nonFirstSend {
err := s.patcher.ApplyAttributesPatch(ctx, patch.NewAttributes, patch.ReplaceAttributes)
if err != nil {
return fmt.Errorf("patch attributes: %w", err)
}
}
if patch.PayloadPatch != nil {
err := s.patcher.ApplyPayloadPatch(ctx, patch.PayloadPatch)
if err != nil {
return fmt.Errorf("patch payload: %w", err)
}
} else if s.nonFirstSend {
return errors.New("invalid non-first patch: empty payload")
}
return nil
}
func (s *Streamer) CloseAndRecv(_ context.Context) (*object.PatchResponse, error) {
return &object.PatchResponse{
Body: &object.PatchResponseBody{
ObjectID: nil,
func (s *Streamer) CloseAndRecv(ctx context.Context) (*objectV2.PatchResponse, error) {
patcherResp, err := s.patcher.Close(ctx)
if err != nil {
return nil, err
}
oidV2 := new(refsV2.ObjectID)
if patcherResp.AccessIdentifiers.ParentID != nil {
patcherResp.AccessIdentifiers.ParentID.WriteToV2(oidV2)
} else {
patcherResp.AccessIdentifiers.SelfID.WriteToV2(oidV2)
}
return &objectV2.PatchResponse{
Body: &objectV2.PatchResponseBody{
ObjectID: oidV2,
},
}, nil
}

View file

@ -0,0 +1,53 @@
package patchsvc
import (
"crypto/ecdsa"
"crypto/elliptic"
"errors"
"fmt"
objectV2 "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/object"
"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs"
"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/session"
putsvc "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/put"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/util"
objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user"
"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
)
// putInitPrm initializes put paramerer for Put stream.
func (s *Streamer) putInitPrm(req *objectV2.PatchRequest, obj *objectV2.Object) (*putsvc.PutInitPrm, error) {
commonPrm, err := util.CommonPrmFromV2(req)
if err != nil {
return nil, err
}
prm := new(putsvc.PutInitPrm)
prm.WithObject(objectSDK.NewFromV2(obj)).
WithCommonPrm(commonPrm).
WithPrivateKey(s.localNodeKey)
return prm, nil
}
func newOwnerID(vh *session.RequestVerificationHeader) (*refs.OwnerID, error) {
for vh.GetOrigin() != nil {
vh = vh.GetOrigin()
}
sig := vh.GetBodySignature()
if sig == nil {
return nil, errors.New("empty body signature")
}
key, err := keys.NewPublicKeyFromBytes(sig.GetKey(), elliptic.P256())
if err != nil {
return nil, fmt.Errorf("invalid signature key: %w", err)
}
var userID user.ID
user.IDFromKey(&userID, (ecdsa.PublicKey)(*key))
ownID := new(refs.OwnerID)
userID.WriteToV2(ownID)
return ownID, nil
}

View file

@ -2,6 +2,7 @@ package putsvc
import (
"context"
"crypto/ecdsa"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/client"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/util"
@ -20,6 +21,8 @@ type PutInitPrm struct {
traverseOpts []placement.Option
relay func(context.Context, client.NodeInfo, client.MultiAddressClient) error
privateKey *ecdsa.PrivateKey
}
type PutChunkPrm struct {
@ -65,3 +68,11 @@ func (p *PutChunkPrm) WithChunk(v []byte) *PutChunkPrm {
return p
}
func (p *PutInitPrm) WithPrivateKey(v *ecdsa.PrivateKey) *PutInitPrm {
if p != nil {
p.privateKey = v
}
return p
}

View file

@ -47,6 +47,11 @@ func (p *Streamer) Init(ctx context.Context, prm *PutInitPrm) error {
return nil
}
// Target accesses underlying target chunked object writer.
func (p *Streamer) Target() transformer.ChunkedObjectWriter {
return p.target
}
// MaxObjectSize returns maximum payload size for the streaming session.
//
// Must be called after the successful Init.
@ -79,11 +84,15 @@ func (p *Streamer) initTarget(prm *PutInitPrm) error {
func (p *Streamer) initUntrustedTarget(prm *PutInitPrm) error {
p.relay = prm.relay
if prm.privateKey != nil {
p.privateKey = prm.privateKey
} else {
nodeKey, err := p.cfg.keyStorage.GetKey(nil)
if err != nil {
return err
}
p.privateKey = nodeKey
}
// prepare untrusted-Put object target
p.target = &validatingPreparedTarget{
@ -136,7 +145,11 @@ func (p *Streamer) initTrustedTarget(prm *PutInitPrm) error {
}
}
if prm.privateKey != nil {
p.privateKey = prm.privateKey
} else {
p.privateKey = key
}
p.target = &validatingTarget{
fmt: p.fmtValidator,
nextTarget: transformer.NewPayloadSizeLimiter(transformer.Params{

View file

@ -38,7 +38,7 @@ type putStreamResponser struct {
}
type patchStreamResponser struct {
stream PatchObjectstream
stream PatchObjectStream
respSvc *response.Service
}
@ -109,7 +109,7 @@ func (s *patchStreamResponser) CloseAndRecv(ctx context.Context) (*object.PatchR
return r, nil
}
func (s *ResponseService) Patch() (PatchObjectstream, error) {
func (s *ResponseService) Patch() (PatchObjectStream, error) {
stream, err := s.svc.Patch()
if err != nil {
return nil, fmt.Errorf("could not create Put object streamer: %w", err)

View file

@ -31,8 +31,8 @@ type PutObjectStream interface {
CloseAndRecv(context.Context) (*object.PutResponse, error)
}
// PatchObjectstream is an interface of FrostFS API v2 compatible patch streamer.
type PatchObjectstream interface {
// PatchObjectStream is an interface of FrostFS API v2 compatible patch streamer.
type PatchObjectStream interface {
Send(context.Context, *object.PatchRequest) error
CloseAndRecv(context.Context) (*object.PatchResponse, error)
}
@ -42,7 +42,7 @@ type PatchObjectstream interface {
type ServiceServer interface {
Get(*object.GetRequest, GetObjectStream) error
Put() (PutObjectStream, error)
Patch() (PatchObjectstream, error)
Patch() (PatchObjectStream, error)
Head(context.Context, *object.HeadRequest) (*object.HeadResponse, error)
Search(*object.SearchRequest, SearchStream) error
Delete(context.Context, *object.DeleteRequest) (*object.DeleteResponse, error)

View file

@ -37,7 +37,7 @@ type putStreamSigner struct {
type patchStreamSigner struct {
sigSvc *util.SignService
stream PatchObjectstream
stream PatchObjectStream
err error
}
@ -142,7 +142,7 @@ func (s *patchStreamSigner) CloseAndRecv(ctx context.Context) (resp *object.Patc
return resp, s.sigSvc.SignResponse(resp, err)
}
func (s *SignService) Patch() (PatchObjectstream, error) {
func (s *SignService) Patch() (PatchObjectStream, error) {
stream, err := s.svc.Patch()
if err != nil {
return nil, fmt.Errorf("could not create Put object streamer: %w", err)

View file

@ -91,7 +91,7 @@ func (c TransportSplitter) Put() (PutObjectStream, error) {
return c.next.Put()
}
func (c TransportSplitter) Patch() (PatchObjectstream, error) {
func (c TransportSplitter) Patch() (PatchObjectStream, error) {
return c.next.Patch()
}