[#648] objsvc/delete: Handle errors in Go style

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

internal/logs/logs.go

@@ -82,19 +82,12 @@ const (
 	PersistentCouldNotCleanUpExpiredTokens                                  = "could not clean up expired tokens"
 	ControllerReportIsAlreadyStarted                                        = "report is already started"
 	TombstoneCouldNotGetTheTombstoneTheSource                               = "tombstone getter: could not get the tombstone the source"
-	DeleteCouldNotComposeSplitInfo                                          = "could not compose split info"
 	DeleteNoSplitInfoObjectIsPHY                                            = "no split info, object is PHY"
 	DeleteAssemblingChain                                                   = "assembling chain..."
-	DeleteCouldNotGetPreviousSplitElement                                   = "could not get previous split element"
 	DeleteCollectingChildren                                                = "collecting children..."
-	DeleteCouldNotCollectObjectChildren                                     = "could not collect object children"
 	DeleteSupplementBySplitID                                               = "supplement by split ID"
-	DeleteCouldNotSearchForSplitChainMembers                                = "could not search for split chain members"
-	DeleteCouldNotMarshalTombstoneStructure                                 = "could not marshal tombstone structure"
-	DeleteCouldNotSaveTheTombstone                                          = "could not save the tombstone"
 	DeleteFormingTombstoneStructure                                         = "forming tombstone structure..."
 	DeleteTombstoneStructureSuccessfullyFormedSaving                        = "tombstone structure successfully formed, saving..."
-	DeleteCouldNotReadTombstoneLifetimeConfig                               = "could not read tombstone lifetime config"
 	DeleteFormingSplitInfo                                                  = "forming split info..."
 	DeleteSplitInfoSuccessfullyFormedCollectingMembers                      = "split info successfully formed, collecting members..."
 	DeleteMembersSuccessfullyCollected                                      = "members successfully collected"

pkg/services/object/delete/delete.go

@@ -29,27 +29,17 @@ func (s *Service) Delete(ctx context.Context, prm Prm) error {
 
 	exec.setLogger(s.log)
 
-	exec.execute(ctx)
-
-	return exec.statusError.err
+	return exec.execute(ctx)
 }
 
-func (exec *execCtx) execute(ctx context.Context) {
+func (exec *execCtx) execute(ctx context.Context) error {
 	exec.log.Debug(logs.ServingRequest)
 
-	// perform local operation
-	exec.executeLocal(ctx)
-	exec.analyzeStatus()
-}
-
-func (exec *execCtx) analyzeStatus() {
-	// analyze local result
-	switch exec.status {
-	case statusOK:
-		exec.log.Debug(logs.OperationFinishedSuccessfully)
-	default:
-		exec.log.Debug(logs.OperationFinishedWithError,
-			zap.String("error", exec.err.Error()),
-		)
+	if err := exec.executeLocal(ctx); err != nil {
+		exec.log.Debug(logs.OperationFinishedWithError, zap.String("error", err.Error()))
+		return err
 	}
+
+	exec.log.Debug(logs.OperationFinishedSuccessfully)
+	return nil
 }

pkg/services/object/delete/exec.go

@@ -2,6 +2,7 @@ package deletesvc
 
 import (
 	"context"
+	"fmt"
 	"strconv"
 
 	objectV2 "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/object"
@@ -15,18 +16,11 @@ import (
 	"go.uber.org/zap"
 )
 
-type statusError struct {
-	status int
-	err    error
-}
-
 type execCtx struct {
 	svc *Service
 
 	prm Prm
 
-	statusError
-
 	log *logger.Logger
 
 	tombstone *objectSDK.Tombstone
@@ -36,11 +30,6 @@ type execCtx struct {
 	tombstoneObj *objectSDK.Object
 }
 
-const (
-	statusUndefined int = iota
-	statusOK
-)
-
 func (exec *execCtx) setLogger(l *logger.Logger) {
 	exec.log = &logger.Logger{Logger: l.With(
 		zap.String("request", "DELETE"),
@@ -75,48 +64,34 @@ func (exec *execCtx) newAddress(id oid.ID) oid.Address {
 	return a
 }
 
-func (exec *execCtx) formSplitInfo(ctx context.Context) bool {
-	success := false
-
+func (exec *execCtx) formSplitInfo(ctx context.Context) error {
 	var err error
 	exec.splitInfo, err = exec.svc.header.splitInfo(ctx, exec)
-
-	switch {
-	default:
-		exec.status = statusUndefined
-		exec.err = err
-
-		exec.log.Debug(logs.DeleteCouldNotComposeSplitInfo,
-			zap.String("error", err.Error()),
-		)
-	case err == nil, apiclient.IsErrObjectAlreadyRemoved(err):
+	if err != nil && !apiclient.IsErrObjectAlreadyRemoved(err) {
 		// IsErrObjectAlreadyRemoved check is required because splitInfo
 		// implicitly performs Head request that may return ObjectAlreadyRemoved
-		// status that is not specified for Delete
-
-		exec.status = statusOK
-		exec.err = nil
-		success = true
+		// status that is not specified for Delete.
+		return err
 	}
 
-	return success
+	return nil
 }
 
-func (exec *execCtx) collectMembers(ctx context.Context) (ok bool) {
+func (exec *execCtx) collectMembers(ctx context.Context) error {
 	if exec.splitInfo == nil {
 		exec.log.Debug(logs.DeleteNoSplitInfoObjectIsPHY)
-		return true
+		return nil
 	}
 
+	var err error
 	if _, withLink := exec.splitInfo.Link(); withLink {
-		ok = exec.collectChildren(ctx)
+		err = exec.collectChildren(ctx)
 	}
 
-	if !ok {
+	if err != nil {
 		if _, withLast := exec.splitInfo.LastPart(); withLast {
-			ok = exec.collectChain(ctx)
-			if !ok {
-				return
+			if err := exec.collectChain(ctx); err != nil {
+				return err
 			}
 		}
 	} // may be fail if neither right nor linking ID is set?
@@ -124,7 +99,7 @@ func (exec *execCtx) collectMembers(ctx context.Context) (ok bool) {
 	return exec.supplementBySplitID(ctx)
 }
 
-func (exec *execCtx) collectChain(ctx context.Context) bool {
+func (exec *execCtx) collectChain(ctx context.Context) error {
 	var chain []oid.ID
 
 	exec.log.Debug(logs.DeleteAssemblingChain)
@@ -133,84 +108,43 @@ func (exec *execCtx) collectChain(ctx context.Context) bool {
 		chain = append(chain, prev)
 
 		p, err := exec.svc.header.previous(ctx, exec, prev)
+		if err != nil {
+			return fmt.Errorf("get previous split element for %s: %w", prev, err)
+		}
 
-		switch {
-		default:
-			exec.status = statusUndefined
-			exec.err = err
-
-			exec.log.Debug(logs.DeleteCouldNotGetPreviousSplitElement,
-				zap.Stringer("id", prev),
-				zap.String("error", err.Error()),
-			)
-
-			return false
-		case err == nil:
-			exec.status = statusOK
-			exec.err = nil
-
-			withPrev = p != nil
-			if withPrev {
-				prev = *p
-			}
+		withPrev = p != nil
+		if withPrev {
+			prev = *p
 		}
 	}
 
 	exec.addMembers(chain)
-
-	return true
+	return nil
 }
 
-func (exec *execCtx) collectChildren(ctx context.Context) bool {
+func (exec *execCtx) collectChildren(ctx context.Context) error {
 	exec.log.Debug(logs.DeleteCollectingChildren)
 
 	children, err := exec.svc.header.children(ctx, exec)
-
-	switch {
-	default:
-		exec.status = statusUndefined
-		exec.err = err
-
-		exec.log.Debug(logs.DeleteCouldNotCollectObjectChildren,
-			zap.String("error", err.Error()),
-		)
-
-		return false
-	case err == nil:
-		exec.status = statusOK
-		exec.err = nil
-
-		link, _ := exec.splitInfo.Link()
-
-		exec.addMembers(append(children, link))
-
-		return true
+	if err != nil {
+		return fmt.Errorf("collect children: %w", err)
 	}
+
+	link, _ := exec.splitInfo.Link()
+	exec.addMembers(append(children, link))
+	return nil
 }
 
-func (exec *execCtx) supplementBySplitID(ctx context.Context) bool {
+func (exec *execCtx) supplementBySplitID(ctx context.Context) error {
 	exec.log.Debug(logs.DeleteSupplementBySplitID)
 
 	chain, err := exec.svc.searcher.splitMembers(ctx, exec)
-
-	switch {
-	default:
-		exec.status = statusUndefined
-		exec.err = err
-
-		exec.log.Debug(logs.DeleteCouldNotSearchForSplitChainMembers,
-			zap.String("error", err.Error()),
-		)
-
-		return false
-	case err == nil:
-		exec.status = statusOK
-		exec.err = nil
-
-		exec.addMembers(chain)
-
-		return true
+	if err != nil {
+		return fmt.Errorf("search split chain members: %w", err)
 	}
+
+	exec.addMembers(chain)
+	return nil
 }
 
 func (exec *execCtx) addMembers(incoming []oid.ID) {
@@ -228,17 +162,10 @@ func (exec *execCtx) addMembers(incoming []oid.ID) {
 	exec.tombstone.SetMembers(append(members, incoming...))
 }
 
-func (exec *execCtx) initTombstoneObject() bool {
+func (exec *execCtx) initTombstoneObject() error {
 	payload, err := exec.tombstone.Marshal()
 	if err != nil {
-		exec.status = statusUndefined
-		exec.err = err
-
-		exec.log.Debug(logs.DeleteCouldNotMarshalTombstoneStructure,
-			zap.String("error", err.Error()),
-		)
-
-		return false
+		return fmt.Errorf("marshal tombstone: %w", err)
 	}
 
 	exec.tombstoneObj = objectSDK.New()
@@ -262,29 +189,15 @@ func (exec *execCtx) initTombstoneObject() bool {
 
 	exec.tombstoneObj.SetAttributes(a)
 
-	return true
+	return nil
 }
 
-func (exec *execCtx) saveTombstone(ctx context.Context) bool {
+func (exec *execCtx) saveTombstone(ctx context.Context) error {
 	id, err := exec.svc.placer.put(ctx, exec)
-
-	switch {
-	default:
-		exec.status = statusUndefined
-		exec.err = err
-
-		exec.log.Debug(logs.DeleteCouldNotSaveTheTombstone,
-			zap.String("error", err.Error()),
-		)
-
-		return false
-	case err == nil:
-		exec.status = statusOK
-		exec.err = nil
-
-		exec.prm.tombAddrWriter.
-			SetAddress(exec.newAddress(*id))
+	if err != nil {
+		return fmt.Errorf("save tombstone: %w", err)
 	}
 
-	return true
+	exec.prm.tombAddrWriter.SetAddress(exec.newAddress(*id))
+	return nil
 }

pkg/services/object/delete/local.go

@@ -2,37 +2,29 @@ package deletesvc
 
 import (
 	"context"
+	"fmt"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
 	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
-	"go.uber.org/zap"
 )
 
-func (exec *execCtx) executeLocal(ctx context.Context) {
+func (exec *execCtx) executeLocal(ctx context.Context) error {
 	exec.log.Debug(logs.DeleteFormingTombstoneStructure)
 
-	ok := exec.formTombstone(ctx)
-	if !ok {
-		return
+	if err := exec.formTombstone(ctx); err != nil {
+		return err
 	}
 
 	exec.log.Debug(logs.DeleteTombstoneStructureSuccessfullyFormedSaving)
 
-	exec.saveTombstone(ctx)
+	return exec.saveTombstone(ctx)
 }
 
-func (exec *execCtx) formTombstone(ctx context.Context) (ok bool) {
+func (exec *execCtx) formTombstone(ctx context.Context) error {
 	tsLifetime, err := exec.svc.netInfo.TombstoneLifetime()
 	if err != nil {
-		exec.status = statusUndefined
-		exec.err = err
-
-		exec.log.Debug(logs.DeleteCouldNotReadTombstoneLifetimeConfig,
-			zap.String("error", err.Error()),
-		)
-
-		return false
+		return fmt.Errorf("fetch tombstone lifetime: %w", err)
 	}
 
 	exec.tombstone = objectSDK.NewTombstone()
@@ -43,26 +35,19 @@ func (exec *execCtx) formTombstone(ctx context.Context) (ok bool) {
 
 	exec.log.Debug(logs.DeleteFormingSplitInfo)
 
-	ok = exec.formSplitInfo(ctx)
-	if !ok {
-		return
+	if err := exec.formSplitInfo(ctx); err != nil {
+		return fmt.Errorf("form split info: %w", err)
 	}
 
 	exec.log.Debug(logs.DeleteSplitInfoSuccessfullyFormedCollectingMembers)
 
 	exec.tombstone.SetSplitID(exec.splitInfo.SplitID())
 
-	ok = exec.collectMembers(ctx)
-	if !ok {
-		return
+	if err := exec.collectMembers(ctx); err != nil {
+		return err
 	}
 
 	exec.log.Debug(logs.DeleteMembersSuccessfullyCollected)
 
-	ok = exec.initTombstoneObject()
-	if !ok {
-		return
-	}
-
-	return true
+	return exec.initTombstoneObject()
 }