src/FrostFS.SDK.Client/FrostFSClient.cs

@@ -254,7 +254,8 @@ public class FrostFSClient : IFrostFSClient
 
     public Task<FrostFsObjectId> PutClientCutObjectAsync(PrmObjectClientCutPut args, CallContext ctx)
     {
-        return GetObjectService().PutClientCutObjectAsync(args, ctx);
+        return GetObjectService().PutClientCutSingleObjectAsync(args, ctx);
+        // return GetObjectService().PutClientCutObjectAsync(args, ctx);
     }
 
     public Task<FrostFsObjectId> PutSingleObjectAsync(PrmSingleObjectPut args, CallContext ctx)

src/FrostFS.SDK.Client/Mappers/Object/ObjectHeaderMapper.cs

@@ -44,6 +44,11 @@ public static class ObjectHeaderMapper
 
     public static FrostFsSplit ToModel(this Header.Types.Split split)
     {
+        if (split is null)
+        {
+            throw new ArgumentNullException(nameof(split));
+        }
+
         var children = split!.Children.Count != 0
             ? new ReadOnlyCollection<FrostFsObjectId>([.. split.Children.Select(x => x.ToModel())])
             : null;

src/FrostFS.SDK.Client/Models/Object/PartUploadedEventArgs.cs

@@ -0,0 +1,8 @@
+using System;
+
+namespace FrostFS.SDK.Client;
+
+public class PartUploadedEventArgs(ObjectPartInfo part) : EventArgs
+{
+    public ObjectPartInfo Part { get; } = part;
+}

src/FrostFS.SDK.Client/Models/Object/UploadInfo.cs

@@ -0,0 +1,38 @@
+using FrostFS.SDK;
+
+namespace FrostFS.SDK.Client;
+
+public readonly struct ObjectPartInfo(long offset, int length, FrostFsObjectId objectId) : System.IEquatable<ObjectPartInfo>
+{
+    public long Offset { get; } = offset;
+    public int Length { get; } = length;
+    public FrostFsObjectId ObjectId { get; } = objectId;
+
+    public override bool Equals(object obj)
+    {
+        if (obj == null || obj is not ObjectPartInfo)
+            return false;
+
+        return Equals((ObjectPartInfo)obj);
+    }
+
+    public override int GetHashCode()
+    {
+        return ((int)(Offset >> 32)) ^ (int)Offset ^ Length ^ ObjectId.Value.GetHashCode();
+    }
+
+    public static bool operator ==(ObjectPartInfo left, ObjectPartInfo right)
+    {
+        return left.Equals(right);
+    }
+
+    public static bool operator !=(ObjectPartInfo left, ObjectPartInfo right)
+    {
+        return !(left == right);
+    }
+
+    public bool Equals(ObjectPartInfo other)
+    {
+        return GetHashCode() == other.GetHashCode();
+    }
+}

src/FrostFS.SDK.Client/Models/Object/UploadProgressInfo.cs

@@ -0,0 +1,48 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+
+namespace FrostFS.SDK.Client;
+
+public class UploadProgressInfo
+{
+    private List<ObjectPartInfo> _parts;
+
+    public UploadProgressInfo(Guid splitId, int capacity = 8)
+    {
+        _parts = new List<ObjectPartInfo>(capacity);
+        SplitId = new SplitId(splitId);
+    }
+
+    public UploadProgressInfo(Guid splitId, Collection<ObjectPartInfo> parts)
+    {
+        _parts = [.. parts];
+        SplitId = new SplitId(splitId);
+    }
+
+    public event EventHandler<PartUploadedEventArgs>? Notify;
+
+    public SplitId SplitId { get; }
+
+    internal void AddPart(ObjectPartInfo part)
+    {
+        _parts.Add(part);
+        Notify?.Invoke(this, new PartUploadedEventArgs(part));
+    }
+
+    public ObjectPartInfo GetPart(int index)
+    {
+        return _parts[index];
+    }
+
+    public ObjectPartInfo GetLast()
+    {
+        return _parts.LastOrDefault();
+    }
+
+    public ReadOnlyCollection<ObjectPartInfo> GetParts()
+    {
+        return new ReadOnlyCollection<ObjectPartInfo>(_parts);
+    }
+}

src/FrostFS.SDK.Client/Parameters/PrmObjectClientCutPut.cs

@@ -8,7 +8,8 @@ public readonly struct PrmObjectClientCutPut(
     int bufferMaxSize = 0,
     FrostFsSessionToken? sessionToken = null,
     byte[]? customBuffer = null,
-    string[]? xheaders = null) : PrmObjectPutBase, System.IEquatable<PrmObjectClientCutPut>
+    string[]? xheaders = null,
+    UploadProgressInfo? progress = null) : PrmObjectPutBase, System.IEquatable<PrmObjectClientCutPut>
 {
     /// <summary>
     /// Need to provide values like <c>ContainerId</c> and <c>ObjectType</c> to create and object.
@@ -41,6 +42,8 @@ public readonly struct PrmObjectClientCutPut(
     /// </summary>
     public string[] XHeaders { get; } = xheaders ?? [];
 
+    public UploadProgressInfo? Progress { get; } = progress;
+
     internal PutObjectContext PutObjectContext { get; } = new();
 
     public override readonly bool Equals(object obj)

src/FrostFS.SDK.Client/Services/ObjectServiceProvider.cs

@@ -387,28 +387,200 @@ internal sealed class ObjectServiceProvider(ObjectService.ObjectServiceClient cl
 
    internal async Task<FrostFsObjectId> PutClientCutObjectAsync(PrmObjectClientCutPut args, CallContext ctx)
     {
-        var stream = args.Payload!;
-        var header = args.Header!;
+        if (args.Payload == null)
+            throw new ArgumentException(nameof(args.Payload));
 
-        if (header.PayloadLength > 0)
-            args.PutObjectContext.FullLength = header.PayloadLength;
-        else if (stream.CanSeek)
-            args.PutObjectContext.FullLength = (ulong)stream.Length;
-        else
-            throw new ArgumentException("The stream does not have a length and payload length is not defined");
-
-        if (args.PutObjectContext.FullLength == 0)
-            throw new ArgumentException("The stream has zero length");
+        if (args.Header == null)
+            throw new ArgumentException(nameof(args.Header));
 
         var networkSettings = await ClientContext.Client.GetNetworkSettingsAsync(ctx).ConfigureAwait(false);
-        var partSize = (int)networkSettings.MaxObjectSize;
+        int partSize = (int)networkSettings.MaxObjectSize;
 
-        var restBytes = args.PutObjectContext.FullLength;
+        int chunkSize = args.BufferMaxSize > 0 ? args.BufferMaxSize : Constants.ObjectChunkSize;
 
-        var objectSize = (int)Math.Min((ulong)partSize, restBytes);
+        ulong fullLength;
 
-        // define collection capacity
-        var objectsCount = (int)(restBytes / (ulong)objectSize) + ((restBytes % (ulong)objectSize) > 0 ? 1 : 0);
+        // Information about the uploaded parts.
+        var progressInfo = args.Progress; // 
+        var offset = 0L;
+
+        if (progressInfo != null && progressInfo.GetParts().Count > 0)
+        {
+            if (!args.Payload.CanSeek)
+            {
+                throw new FrostFsException("Cannot resume client cut upload for this stream. Seek must be supported.");
+            }
+
+            var lastPart = progressInfo.GetLast();
+            args.Payload.Position = lastPart.Offset + lastPart.Length;
+            fullLength = (ulong)(args.Payload.Length - args.Payload.Position);
+            offset = args.Payload.Position;
+        }
+        else
+        {
+            if (args.Header.PayloadLength > 0)
+                fullLength = args.Header.PayloadLength;
+            else if (args.Payload.CanSeek)
+                fullLength = (ulong)args.Payload.Length;
+            else
+                throw new ArgumentException("The stream does not have a length and payload length is not defined");
+        }
+
+        //define collection capacity
+        var restPart = (fullLength % (ulong)partSize) > 0 ? 1 : 0;
+        var objectsCount = fullLength > 0 ? (int)(fullLength / (ulong)partSize) + restPart : 0;
+
+        progressInfo ??= new UploadProgressInfo(Guid.NewGuid(), objectsCount);
+          
+        var remain = fullLength;
+        
+        byte[]? buffer = null;
+        bool isRentBuffer = false;
+
+        try
+        {
+            if (args.CustomBuffer != null)
+            {
+                if (args.CustomBuffer.Length < chunkSize)
+                    throw new ArgumentException($"Buffer size is too small. At least {chunkSize} required");
+                
+                buffer = args.CustomBuffer;
+            }
+            else
+            {
+                buffer = ArrayPool<byte>.Shared.Rent(chunkSize);
+                isRentBuffer = true;
+            }
+
+            FrostFsObjectId? resultObjectId = null;
+            FrostFsObjectHeader? parentHeader = null;
+
+            while (remain > 0)
+            {
+                var bytesToWrite = Math.Min((ulong)partSize, remain);               
+                var isLastPart = remain <= (ulong)partSize;
+
+                // When the last part of the object is uploaded, all metadata for the object must be added
+                if (isLastPart && objectsCount > 1)
+                {
+                    parentHeader = new FrostFsObjectHeader(args.Header.ContainerId, FrostFsObjectType.Regular)
+                    {
+                        Attributes = args.Header.Attributes,
+                        PayloadLength = fullLength
+                    };
+                }
+
+                // Uploading the next part of the object. Note: the request must contain a non-null SplitId parameter
+                var header = objectsCount == 1 ? args.Header : new FrostFsObjectHeader(
+                    args.Header.ContainerId,
+                    FrostFsObjectType.Regular,
+                    [],
+                    new FrostFsSplit(progressInfo.SplitId, progressInfo.GetLast().ObjectId, parentHeader: parentHeader));
+
+                var prm = new PrmObjectPut(header);
+                using var stream = await PutStreamObjectAsync(prm, ctx).ConfigureAwait(false);
+                var uploaded = 0;
+
+                // If an error occurs while uploading a part of the object, there is no need to re-upload the parts
+                // that were successfully uploaded before. It is sufficient to re-upload only the failed part
+
+                var thisPartRest = (int)Math.Min((ulong)partSize, remain);
+                while (thisPartRest > 0)
+                {
+                    var nextChunkSize = Math.Min(thisPartRest, chunkSize);
+                    var size = await args.Payload.ReadAsync(buffer, 0, nextChunkSize).ConfigureAwait(false);
+
+                    if (size == 0)
+                        break;
+
+                    await stream.WriteAsync(buffer.AsMemory(0, size)).ConfigureAwait(false);
+                    uploaded += size;
+                    thisPartRest -= size;
+                }
+
+                var objectId = await stream.CompleteAsync().ConfigureAwait(false);
+                var part = new ObjectPartInfo(offset, uploaded, objectId);
+                offset += uploaded;
+                progressInfo.AddPart(part);
+               
+                remain -= bytesToWrite;
+
+                if (isLastPart)
+                {
+                    if (objectsCount == 1)
+                    {
+                        return progressInfo.GetPart(0).ObjectId;
+                    }
+
+                    if (parentHeader == null) continue;
+
+                    // Once all parts of the object are uploaded, they must be linked into a single entity
+                    var linkObject = new FrostFsLinkObject(header.ContainerId, progressInfo.SplitId, parentHeader,
+                        [.. progressInfo.GetParts().Select(p => p.ObjectId)]);
+
+                    await PutSingleObjectAsync(new PrmSingleObjectPut(linkObject), ctx).ConfigureAwait(false);
+
+                    // Retrieve the ID of the linked object
+                    resultObjectId = FrostFsObjectId.FromHash(prm.Header!.GetHeader().Split!.Parent.Value.Span);
+                    return resultObjectId;
+                }
+            }
+
+            throw new FrostFsException("Unexpected error: cannot send object");
+        }
+        finally
+        {
+            if (isRentBuffer && buffer != null)
+            {
+                ArrayPool<byte>.Shared.Return(buffer);
+            }
+        }
+    }
+
+    internal async Task<FrostFsObjectId> PutClientCutSingleObjectAsync(PrmObjectClientCutPut args, CallContext ctx)
+    {
+        if (args.Payload == null)
+            throw new ArgumentException(nameof(args.Payload));
+
+        if (args.Header == null)
+            throw new ArgumentException(nameof(args.Header));
+
+        var networkSettings = await ClientContext.Client.GetNetworkSettingsAsync(ctx).ConfigureAwait(false);
+        int partSize = (int)networkSettings.MaxObjectSize;
+
+        int chunkSize = args.BufferMaxSize > 0 ? args.BufferMaxSize : Constants.ObjectChunkSize;
+
+        ulong fullLength;
+
+        // Information about the uploaded parts.
+        var progressInfo = args.Progress; // 
+        var offset = 0L;
+
+        if (progressInfo != null && progressInfo.GetParts().Count > 0)
+        {
+            if (!args.Payload.CanSeek)
+            {
+                throw new FrostFsException("Cannot resume client cut upload for this stream. Seek must be supported.");
+            }
+
+            var lastPart = progressInfo.GetLast();
+            args.Payload.Position = lastPart.Offset + lastPart.Length;
+            fullLength = (ulong)(args.Payload.Length - args.Payload.Position);
+            offset = args.Payload.Position;
+        }
+        else
+        {
+            if (args.Header.PayloadLength > 0)
+                fullLength = args.Header.PayloadLength;
+            else if (args.Payload.CanSeek)
+                fullLength = (ulong)args.Payload.Length;
+            else
+                throw new ArgumentException("The stream does not have a length and payload length is not defined");
+        }
+
+        //define collection capacity
+        var restPart = (fullLength % (ulong)partSize) > 0 ? 1 : 0;
+        var objectsCount = fullLength > 0 ? (int)(fullLength / (ulong)partSize) + restPart : 0;
 
         // if the object fits one part, it can be loaded as non-complex object
         if (objectsCount == 1)
@@ -418,26 +590,14 @@ internal sealed class ObjectServiceProvider(ObjectService.ObjectServiceClient cl
             return singlePartResult.ObjectId;
         }
 
-        List<FrostFsObjectId> parts = new(objectsCount);
+        progressInfo ??= new UploadProgressInfo(Guid.NewGuid(), objectsCount);
 
-        SplitId splitId = new();
+        var remain = fullLength;
 
-        // keep attributes for the large object
-        var attributes = args.Header!.Attributes.ToArray();
-        header.Attributes = null;
-
-        var remain = args.PutObjectContext.FullLength;
-
-        FrostFsObjectHeader? parentHeader = null;
-
-        var lastIndex = objectsCount - 1;
-
-        bool rentBuffer = false;
         byte[]? buffer = null;
+        bool isRentBuffer = false;
 
         try
-        {
-            for (int i = 0; i < objectsCount; i++)
         {
             if (args.CustomBuffer != null)
             {
@@ -451,27 +611,33 @@ internal sealed class ObjectServiceProvider(ObjectService.ObjectServiceClient cl
             else
             {
                 buffer = ArrayPool<byte>.Shared.Rent(partSize);
-                    rentBuffer = true;
+                isRentBuffer = true;
             }
 
+            FrostFsObjectHeader? parentHeader = null;
+
+            for (int i = 0; i < objectsCount;)
+            {
+                i++;
                 var bytesToWrite = Math.Min((ulong)partSize, remain);
 
-                var size = await stream.ReadAsync(buffer, 0, (int)bytesToWrite).ConfigureAwait(false);
+                var size = await args.Payload.ReadAsync(buffer, 0, (int)bytesToWrite).ConfigureAwait(false);
 
-                if (i == lastIndex)
+                if (i == objectsCount)
                 {
-                    parentHeader = new FrostFsObjectHeader(header.ContainerId, FrostFsObjectType.Regular, attributes)
+                    parentHeader = new FrostFsObjectHeader(args.Header.ContainerId, FrostFsObjectType.Regular)
                     {
-                        PayloadLength = args.PutObjectContext.FullLength
+                        PayloadLength = args.PutObjectContext.FullLength,
+                        Attributes = args.Header.Attributes
                     };
                 }
 
                 // Uploading the next part of the object. Note: the request must contain a non-null SplitId parameter
                 var partHeader = new FrostFsObjectHeader(
-                    header.ContainerId,
+                    args.Header.ContainerId,
                     FrostFsObjectType.Regular,
                     [],
-                    new FrostFsSplit(splitId, parts.LastOrDefault(),
+                    new FrostFsSplit(progressInfo.SplitId, progressInfo.GetLast().ObjectId,
                     parentHeader: parentHeader))
                 {
                     PayloadLength = (ulong)size
@@ -484,15 +650,18 @@ internal sealed class ObjectServiceProvider(ObjectService.ObjectServiceClient cl
 
                 var prm = new PrmSingleObjectPut(obj);
 
-                var objId = await PutSingleObjectAsync(prm, ctx).ConfigureAwait(false);
+                var objectId = await PutSingleObjectAsync(prm, ctx).ConfigureAwait(false);
 
-                parts.Add(objId);
+                var part = new ObjectPartInfo(offset, size, objectId);
+                progressInfo.AddPart(part);
 
-                if (i < lastIndex)
+                offset += size;
+
+                if (i < objectsCount)
                     continue;
 
                 // Once all parts of the object are uploaded, they must be linked into a single entity
-                var linkObject = new FrostFsLinkObject(header.ContainerId, splitId, parentHeader!, parts);
+                var linkObject = new FrostFsLinkObject(args.Header.ContainerId, progressInfo.SplitId, parentHeader!, [.. progressInfo.GetParts().Select(p => p.ObjectId)]);
 
                 _ = await PutSingleObjectAsync(new PrmSingleObjectPut(linkObject), ctx).ConfigureAwait(false);
 
@@ -504,7 +673,7 @@ internal sealed class ObjectServiceProvider(ObjectService.ObjectServiceClient cl
         }
         finally
         {
-            if (rentBuffer && buffer != null)
+            if (isRentBuffer && buffer != null)
             {
                 ArrayPool<byte>.Shared.Return(buffer);
             }