[#1731] engine: Move single shard PUT to a separate function

Signed-off-by: Evgenii Stratonikov <evgeniy@morphbits.ru>

pkg/local_object_storage/engine/put.go

@@ -5,7 +5,9 @@ import (
 
 	"github.com/nspcc-dev/neofs-node/pkg/core/object"
 	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/shard"
+	"github.com/nspcc-dev/neofs-node/pkg/util"
 	objectSDK "github.com/nspcc-dev/neofs-sdk-go/object"
+	oid "github.com/nspcc-dev/neofs-sdk-go/object/id"
 	"go.uber.org/zap"
 )
 
@@ -57,9 +59,6 @@ func (e *StorageEngine) put(prm PutPrm) (PutRes, error) {
 		return PutRes{}, err
 	}
 
-	var existPrm shard.ExistsPrm
-	existPrm.SetAddress(addr)
-
 	finished := false
 
 	e.iterateOverSortedShards(addr, func(ind int, sh hashedShard) (stop bool) {
@@ -67,61 +66,7 @@ func (e *StorageEngine) put(prm PutPrm) (PutRes, error) {
 		pool := e.shardPools[sh.ID().String()]
 		e.mtx.RUnlock()
 
-		exitCh := make(chan struct{})
+		finished = e.putToShard(sh.Shard, ind, pool, addr, prm.obj)
-
-		if err := pool.Submit(func() {
-			defer close(exitCh)
-
-			exists, err := sh.Exists(existPrm)
-			if err != nil {
-				if shard.IsErrObjectExpired(err) {
-					// object is already found but
-					// expired => do nothing with it
-					finished = true
-				}
-
-				return // this is not ErrAlreadyRemoved error so we can go to the next shard
-			}
-
-			if exists.Exists() {
-				if ind != 0 {
-					var toMoveItPrm shard.ToMoveItPrm
-					toMoveItPrm.SetAddress(addr)
-
-					_, err = sh.ToMoveIt(toMoveItPrm)
-					if err != nil {
-						e.log.Warn("could not mark object for shard relocation",
-							zap.Stringer("shard", sh.ID()),
-							zap.String("error", err.Error()),
-						)
-					}
-				}
-
-				finished = true
-
-				return
-			}
-
-			var putPrm shard.PutPrm
-			putPrm.SetObject(prm.obj)
-
-			_, err = sh.Put(putPrm)
-			if err != nil {
-				e.log.Warn("could not put object in shard",
-					zap.Stringer("shard", sh.ID()),
-					zap.String("error", err.Error()),
-				)
-
-				return
-			}
-
-			finished = true
-		}); err != nil {
-			close(exitCh)
-		}
-
-		<-exitCh
-
 		return finished
 	})
 
@@ -132,6 +77,69 @@ func (e *StorageEngine) put(prm PutPrm) (PutRes, error) {
 	return PutRes{}, err
 }
 
+func (e *StorageEngine) putToShard(sh *shard.Shard, ind int, pool util.WorkerPool, addr oid.Address, obj *objectSDK.Object) bool {
+	var finished bool
+
+	exitCh := make(chan struct{})
+
+	if err := pool.Submit(func() {
+		defer close(exitCh)
+
+		var existPrm shard.ExistsPrm
+		existPrm.SetAddress(addr)
+
+		exists, err := sh.Exists(existPrm)
+		if err != nil {
+			if shard.IsErrObjectExpired(err) {
+				// object is already found but
+				// expired => do nothing with it
+				finished = true
+			}
+
+			return // this is not ErrAlreadyRemoved error so we can go to the next shard
+		}
+
+		if exists.Exists() {
+			if ind != 0 {
+				var toMoveItPrm shard.ToMoveItPrm
+				toMoveItPrm.SetAddress(addr)
+
+				_, err = sh.ToMoveIt(toMoveItPrm)
+				if err != nil {
+					e.log.Warn("could not mark object for shard relocation",
+						zap.Stringer("shard", sh.ID()),
+						zap.String("error", err.Error()),
+					)
+				}
+			}
+
+			finished = true
+
+			return
+		}
+
+		var putPrm shard.PutPrm
+		putPrm.SetObject(obj)
+
+		_, err = sh.Put(putPrm)
+		if err != nil {
+			e.log.Warn("could not put object in shard",
+				zap.Stringer("shard", sh.ID()),
+				zap.String("error", err.Error()))
+
+			return
+		}
+
+		finished = true
+	}); err != nil {
+		close(exitCh)
+	}
+
+	<-exitCh
+
+	return finished
+}
+
 // Put writes provided object to local storage.
 func Put(storage *StorageEngine, obj *objectSDK.Object) error {
 	var putPrm PutPrm