[#277] getsvc: Drop cyclic struct dependency

Drop cyclic dependency between execCtx and Service.

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/services/object/get/assemble.go

@@ -97,18 +97,16 @@ func equalAddresses(a, b oid.Address) bool {
 }
 
 func (exec *execCtx) HeadObject(ctx context.Context, id oid.ID) (*objectSDK.Object, error) {
-	p := exec.prm
+	w := NewSimpleObjectWriter()
+
+	p := RequestParameters{}
 	p.common = p.common.WithLocalOnly(false)
 	p.addr.SetContainer(exec.containerID())
 	p.addr.SetObject(id)
+	p.head = true
+	p.SetHeaderWriter(w)
 
-	prm := HeadPrm{
-		commonPrm: p.commonPrm,
-	}
-
-	w := NewSimpleObjectWriter()
-	prm.SetHeaderWriter(w)
-	err := exec.svc.Head(ctx, prm)
+	err := exec.getDetached(ctx, p)
 
 	if err != nil {
 		return nil, err
@@ -128,8 +126,26 @@ func (exec *execCtx) GetObject(ctx context.Context, id oid.ID, rng *objectSDK.Ra
 	p.addr.SetContainer(exec.containerID())
 	p.addr.SetObject(id)
 
-	if err := exec.svc.get(ctx, p); err != nil {
+	if err := exec.getDetached(ctx, p); err != nil {
 		return nil, err
 	}
 	return w.Object(), nil
 }
+
+func (exec *execCtx) getDetached(ctx context.Context, prm RequestParameters) error {
+	detachedExecutor := &execCtx{
+		keyStore:                 exec.keyStore,
+		traverserGenerator:       exec.traverserGenerator,
+		remoteStorageConstructor: exec.remoteStorageConstructor,
+		epochSource:              exec.epochSource,
+		localStorage:             exec.localStorage,
+
+		prm:       prm,
+		infoSplit: objectSDK.NewSplitInfo(),
+		log:       exec.log,
+	}
+
+	detachedExecutor.execute(ctx)
+
+	return detachedExecutor.statusError.err
+}

pkg/services/object/get/exec.go

@@ -27,8 +27,6 @@ type RequestParameters struct {
 }
 
 type execCtx struct {
-	svc *Service
-
 	prm RequestParameters
 
 	statusError
@@ -40,6 +38,12 @@ type execCtx struct {
 	collectedObject *objectSDK.Object
 
 	curProcEpoch uint64
+
+	keyStore                 keyStorage
+	epochSource              epochSource
+	traverserGenerator       traverserGenerator
+	remoteStorageConstructor remoteStorageConstructor
+	localStorage             localStorage
 }
 
 const (
@@ -96,7 +100,7 @@ func (exec execCtx) key() (*ecdsa.PrivateKey, error) {
 		}
 	}
 
-	return exec.svc.keyStore.GetKey(sessionInfo)
+	return exec.keyStore.GetKey(sessionInfo)
 }
 
 func (exec *execCtx) canAssemble() bool {
@@ -133,7 +137,7 @@ func (exec *execCtx) initEpoch() bool {
 		return true
 	}
 
-	e, err := exec.svc.epochSource.Epoch()
+	e, err := exec.epochSource.Epoch()
 
 	switch {
 	default:
@@ -154,7 +158,7 @@ func (exec *execCtx) initEpoch() bool {
 func (exec *execCtx) generateTraverser(addr oid.Address) (*placement.Traverser, bool) {
 	obj := addr.Object()
 
-	t, err := exec.svc.traverserGenerator.GenerateTraverser(addr.Container(), &obj, exec.curProcEpoch)
+	t, err := exec.traverserGenerator.GenerateTraverser(addr.Container(), &obj, exec.curProcEpoch)
 
 	switch {
 	default:
@@ -172,7 +176,7 @@ func (exec *execCtx) generateTraverser(addr oid.Address) (*placement.Traverser,
 }
 
 func (exec execCtx) getRemoteStorage(info clientcore.NodeInfo) (remoteStorage, bool) {
-	rs, err := exec.svc.remoteStorageConstructor.Get(info)
+	rs, err := exec.remoteStorageConstructor.Get(info)
 	if err != nil {
 		exec.status = statusUndefined
 		exec.err = err

pkg/services/object/get/get.go

@@ -67,7 +67,12 @@ func (s *Service) Head(ctx context.Context, prm HeadPrm) error {
 
 func (s *Service) get(ctx context.Context, prm RequestParameters) error {
 	exec := &execCtx{
-		svc:       s,
+		keyStore:                 s.keyStore,
+		traverserGenerator:       s.traverserGenerator,
+		remoteStorageConstructor: s.remoteStorageConstructor,
+		epochSource:              s.epochSource,
+		localStorage:             s.localStorage,
+
 		prm:       prm,
 		infoSplit: object.NewSplitInfo(),
 	}

pkg/services/object/get/local.go

@@ -52,10 +52,10 @@ func (exec *execCtx) executeLocal(ctx context.Context) {
 
 func (exec *execCtx) get(ctx context.Context) (*objectSDK.Object, error) {
 	if exec.headOnly() {
-		return exec.svc.localStorage.Head(ctx, exec.address(), exec.isRaw())
+		return exec.localStorage.Head(ctx, exec.address(), exec.isRaw())
 	}
 	if rng := exec.ctxRange(); rng != nil {
-		return exec.svc.localStorage.Range(ctx, exec.address(), rng)
+		return exec.localStorage.Range(ctx, exec.address(), rng)
 	}
-	return exec.svc.localStorage.Get(ctx, exec.address())
+	return exec.localStorage.Get(ctx, exec.address())
 }

pkg/services/object/get/prm.go

@@ -158,7 +158,7 @@ func (p *commonPrm) WithCachedSignerKey(signerKey *ecdsa.PrivateKey) {
 }
 
 // SetHeaderWriter sets target component to write the object header.
-func (p *HeadPrm) SetHeaderWriter(w HeaderWriter) {
+func (p *commonPrm) SetHeaderWriter(w HeaderWriter) {
 	p.objWriter = &partWriter{
 		headWriter: w,
 	}