[#24] Client: Implement pool part1

first iteration - base classes and methods

Signed-off-by: Pavel Gross <p.gross@yadro.com>

src/FrostFS.SDK.ClientV2/Cache.cs

@@ -1,23 +0,0 @@
-using Microsoft.Extensions.Caching.Memory;
-
-namespace FrostFS.SDK.ClientV2
-{
-    internal static class Cache
-    {
-        private static readonly IMemoryCache _ownersCache = new MemoryCache(new MemoryCacheOptions
-        {
-            // TODO: get from options?
-            SizeLimit = 256
-        });
-
-        private static readonly IMemoryCache _containersCache = new MemoryCache(new MemoryCacheOptions
-        {
-            // TODO: get from options?
-            SizeLimit = 1024
-        });
-
-        internal static IMemoryCache Owners => _ownersCache;
-
-        internal static IMemoryCache Containers => _containersCache;
-    }
-}

src/FrostFS.SDK.ClientV2/Caches.cs

@@ -0,0 +1,22 @@
+using Microsoft.Extensions.Caching.Memory;
+
+namespace FrostFS.SDK.ClientV2;
+
+internal static class Caches
+{
+    private static readonly IMemoryCache _ownersCache = new MemoryCache(new MemoryCacheOptions
+    {
+        // TODO: get from options?
+        SizeLimit = 256
+    });
+
+    private static readonly IMemoryCache _containersCache = new MemoryCache(new MemoryCacheOptions
+    {
+        // TODO: get from options?
+        SizeLimit = 1024
+    });
+
+    internal static IMemoryCache Owners => _ownersCache;
+
+    internal static IMemoryCache Containers => _containersCache;
+}

src/FrostFS.SDK.ClientV2/CllientKey.cs

@@ -4,12 +4,11 @@ using FrostFS.SDK.Cryptography;
 
 using Google.Protobuf;
 
-namespace FrostFS.SDK.ClientV2
+namespace FrostFS.SDK.ClientV2;
-{
+
 public class ClientKey(ECDsa key)
 {
     internal ECDsa ECDsaKey { get; } = key;
 
     internal ByteString PublicKeyProto { get; } = ByteString.CopyFrom(key.PublicKey());
 }
-}

src/FrostFS.SDK.ClientV2/Exceptions/SessionExpiredException.cs

@@ -0,0 +1,18 @@
+using System;
+
+namespace FrostFS.SDK.ClientV2;
+
+public class SessionExpiredException : FrostFsException
+{
+    public SessionExpiredException()
+    {
+    }
+
+    public SessionExpiredException(string message) : base(message)
+    {
+    }
+
+    public SessionExpiredException(string message, Exception innerException) : base(message, innerException)
+    {
+    }
+}

src/FrostFS.SDK.ClientV2/Exceptions/SessionNotFoundException.cs

@@ -0,0 +1,18 @@
+using System;
+
+namespace FrostFS.SDK.ClientV2;
+
+public class SessionNotFoundException : FrostFsException
+{
+    public SessionNotFoundException()
+    {
+    }
+
+    public SessionNotFoundException(string message) : base(message)
+    {
+    }
+
+    public SessionNotFoundException(string message, Exception innerException) : base(message, innerException)
+    {
+    }
+}

src/FrostFS.SDK.ClientV2/FrostFSClient.cs

@@ -6,10 +6,12 @@ using System.Threading.Tasks;
 using Frostfs.V2.Ape;
 using Frostfs.V2.Apemanager;
 
+using FrostFS.Accounting;
 using FrostFS.Container;
 using FrostFS.Netmap;
 using FrostFS.Object;
 using FrostFS.SDK.ClientV2.Interfaces;
+using FrostFS.SDK.ClientV2.Services;
 using FrostFS.SDK.Cryptography;
 using FrostFS.Session;
 
@@ -35,7 +37,9 @@ public class FrostFSClient : IFrostFSClient
 
     internal ObjectService.ObjectServiceClient? ObjectServiceClient { get; set; }
 
-    internal ClientEnvironment ClientCtx { get; set; }
+    internal AccountingService.AccountingServiceClient? AccountingServiceClient { get; set; }
+
+    internal EnvironmentContext ClientCtx { get; set; }
 
     public static IFrostFSClient GetInstance(IOptions<ClientSettings> clientOptions, GrpcChannelOptions? channelOptions = null)
     {
@@ -89,7 +93,7 @@ public class FrostFSClient : IFrostFSClient
         var ecdsaKey = settings.Value.Key.LoadWif();
         FrostFsOwner.FromKey(ecdsaKey);
 
-        ClientCtx = new ClientEnvironment(
+        ClientCtx = new EnvironmentContext(
            client: this,
            key: ecdsaKey,
            owner: FrostFsOwner.FromKey(ecdsaKey),
@@ -110,7 +114,7 @@ public class FrostFSClient : IFrostFSClient
 
         var channel = InitGrpcChannel(clientSettings.Host, channelOptions);
 
-        ClientCtx = new ClientEnvironment(
+        ClientCtx = new EnvironmentContext(
             this,
             key: null,
             owner: null,
@@ -131,7 +135,7 @@ public class FrostFSClient : IFrostFSClient
 
         var channel = InitGrpcChannel(clientSettings.Host, channelOptions);
 
-        ClientCtx = new ClientEnvironment(
+        ClientCtx = new EnvironmentContext(
             this,
             key: ecdsaKey,
             owner: FrostFsOwner.FromKey(ecdsaKey),
@@ -142,6 +146,16 @@ public class FrostFSClient : IFrostFSClient
         // CheckFrostFsVersionSupport(new Context { Timeout = TimeSpan.FromSeconds(20) });
     }
 
+    internal FrostFSClient(WrapperPrm prm)
+    {
+        ClientCtx = new EnvironmentContext(
+           client: this,
+           key: prm.Key,
+           owner: FrostFsOwner.FromKey(prm.Key!),
+           channel: InitGrpcChannel(prm.Address, null), //prm.GrpcChannelOptions),
+           version: new FrostFsVersion(2, 13));
+    }
+
     public void Dispose()
     {
         Dispose(true);
@@ -312,9 +326,9 @@ public class FrostFSClient : IFrostFSClient
             throw new ArgumentNullException(nameof(args));
 
         var session = await CreateSessionInternalAsync(args).ConfigureAwait(false);
-        var token = session.Serialize();
 
-        return new FrostFsSessionToken(token);
+        var token = session.Serialize();
+        return new FrostFsSessionToken(token, session.Body.Id.ToUuid());
     }
 
     internal Task<SessionToken> CreateSessionInternalAsync(PrmSessionCreate args)
@@ -327,8 +341,18 @@ public class FrostFSClient : IFrostFSClient
     }
     #endregion
 
+    #region Accounting Implementation
+    public async Task<Accounting.Decimal> GetBalanceAsync(PrmBalance? args)
+    {
+        args ??= new PrmBalance();
+
+        var service = GetAccouningService(args);
+        return await service.GetBallance(args).ConfigureAwait(false);
+    }
+    #endregion
+
     #region ToolsImplementation
-    public FrostFsObjectId CalculateObjectId(FrostFsObjectHeader header, Context ctx)
+    public FrostFsObjectId CalculateObjectId(FrostFsObjectHeader header, CallContext ctx)
     {
         if (header == null)
             throw new ArgumentNullException(nameof(header));
@@ -337,7 +361,7 @@ public class FrostFSClient : IFrostFSClient
     }
     #endregion
 
-    private async void CheckFrostFsVersionSupport(Context? ctx = default)
+    private async void CheckFrostFsVersionSupport(CallContext? ctx = default)
     {
         var args = new PrmNodeInfo { Context = ctx };
 
@@ -359,7 +383,7 @@ public class FrostFSClient : IFrostFSClient
         if (isDisposed)
             throw new InvalidObjectException("Client is disposed.");
 
-        ctx.Context ??= new Context();
+        ctx.Context ??= new CallContext();
 
         if (ctx.Context.Key == null)
         {
@@ -441,6 +465,16 @@ public class FrostFSClient : IFrostFSClient
         return new ApeManagerServiceProvider(client, ClientCtx);
     }
 
+    private AccountingServiceProvider GetAccouningService(IContext ctx)
+    {
+        var callInvoker = SetupEnvironment(ctx);
+        var client = AccountingServiceClient ?? (callInvoker != null
+            ? new AccountingService.AccountingServiceClient(callInvoker)
+            : new AccountingService.AccountingServiceClient(ClientCtx.Channel));
+
+        return new AccountingServiceProvider(client, ClientCtx);
+    }
+
     private ContainerServiceProvider GetContainerService(IContext ctx)
     {
         var callInvoker = SetupEnvironment(ctx);
@@ -461,6 +495,16 @@ public class FrostFSClient : IFrostFSClient
         return new ObjectServiceProvider(client, ClientCtx);
     }
 
+    private AccountingServiceProvider GetAccountService(IContext ctx)
+    {
+        var callInvoker = SetupEnvironment(ctx);
+        var client = AccountingServiceClient ?? (callInvoker != null
+            ? new AccountingService.AccountingServiceClient(callInvoker)
+            : new AccountingService.AccountingServiceClient(ClientCtx.Channel));
+
+        return new AccountingServiceProvider(client, ClientCtx);
+    }
+
     private static GrpcChannel InitGrpcChannel(string host, GrpcChannelOptions? channelOptions)
     {
         try
@@ -480,4 +524,31 @@ public class FrostFSClient : IFrostFSClient
             throw new ArgumentException($"Host '{host}' has invalid format. Error: {e.Message}");
         }
     }
+
+    public async Task<string?> Dial(CallContext ctx)
+    {
+        try
+        {
+            var prm = new PrmBalance { Context = ctx };
+
+            var service = GetAccouningService(prm);
+            var balance = await service.GetBallance(prm).ConfigureAwait(false);
+
+            return null;
+        }
+        catch (FrostFsException ex)
+        {
+            return ex.Message;
+        }
+    }
+
+    public bool RestartIfUnhealthy(CallContext ctx)
+    {
+        throw new NotImplementedException();
+    }
+
+    public void Close()
+    {
+        Dispose();
+    }
 }

src/FrostFS.SDK.ClientV2/GlobalSuppressions.cs

@@ -0,0 +1,8 @@
+// This file is used by Code Analysis to maintain SuppressMessage
+// attributes that are applied to this project.
+// Project-level suppressions either have no target or are given
+// a specific target and scoped to a namespace, type, member, etc.
+
+using System.Diagnostics.CodeAnalysis;
+
+[assembly: SuppressMessage("Security", "CA5394:Do not use insecure randomness", Justification = "<Pending>", Scope = "member", Target = "~M:FrostFS.SDK.ClientV2.Sampler.Next~System.Int32")]

src/FrostFS.SDK.ClientV2/Interfaces/IFrostFSClient.cs

@@ -19,7 +19,7 @@ public interface IFrostFSClient : IDisposable
     Task<FrostFsSessionToken> CreateSessionAsync(PrmSessionCreate args);
     #endregion
 
-    #region ApeMAnager
+    #region ApeManager
     Task<byte[]> AddChainAsync(PrmApeChainAdd args);
 
     Task RemoveChainAsync(PrmApeChainRemove args);
@@ -51,7 +51,17 @@ public interface IFrostFSClient : IDisposable
     IAsyncEnumerable<FrostFsObjectId> SearchObjectsAsync(PrmObjectSearch args);
     #endregion
 
-    #region Tools
+    #region Account
-    FrostFsObjectId CalculateObjectId(FrostFsObjectHeader header, Context ctx);
+    Task<Accounting.Decimal> GetBalanceAsync(PrmBalance? args = null);
     #endregion
+
+    #region Tools
+    FrostFsObjectId CalculateObjectId(FrostFsObjectHeader header, CallContext ctx);
+    #endregion
+
+    public Task<string?> Dial(CallContext ctx);
+
+    public bool RestartIfUnhealthy(CallContext ctx);
+
+    public void Close();
 }

src/FrostFS.SDK.ClientV2/Mappers/ContainerId.cs

@@ -24,14 +24,14 @@ public static class ContainerIdMapper
 
         var containerId = model.GetValue() ?? throw new ArgumentNullException(nameof(model));
 
-        if (!Cache.Containers.TryGetValue(containerId, out ContainerID? message))
+        if (!Caches.Containers.TryGetValue(containerId, out ContainerID? message))
         {
             message = new ContainerID
             {
                 Value = ByteString.CopyFrom(Base58.Decode(containerId))
             };
 
-            Cache.Containers.Set(containerId, message, _oneHourExpiration);
+            Caches.Containers.Set(containerId, message, _oneHourExpiration);
         }
 
         return message!;

src/FrostFS.SDK.ClientV2/Mappers/OwnerId.cs

@@ -22,14 +22,14 @@ public static class OwnerIdMapper
             throw new ArgumentNullException(nameof(model));
         }
 
-        if (!Cache.Owners.TryGetValue(model, out OwnerID? message))
+        if (!Caches.Owners.TryGetValue(model, out OwnerID? message))
         {
             message = new OwnerID
             {
                 Value = ByteString.CopyFrom(model.ToHash())
             };
 
-            Cache.Owners.Set(model, message, _oneHourExpiration);
+            Caches.Owners.Set(model, message, _oneHourExpiration);
         }
 
         return message!;
@@ -42,11 +42,11 @@ public static class OwnerIdMapper
             throw new ArgumentNullException(nameof(message));
         }
 
-        if (!Cache.Owners.TryGetValue(message, out FrostFsOwner? model))
+        if (!Caches.Owners.TryGetValue(message, out FrostFsOwner? model))
         {
             model = new FrostFsOwner(Base58.Encode(message.Value.ToByteArray()));
 
-            Cache.Owners.Set(message, model, _oneHourExpiration);
+            Caches.Owners.Set(message, model, _oneHourExpiration);
         }
 
         return model!;

src/FrostFS.SDK.ClientV2/Models/Chain/ChainTarget.cs

@@ -2,8 +2,8 @@
 
 using Frostfs.V2.Ape;
 
-namespace FrostFS.SDK.ClientV2
+namespace FrostFS.SDK.ClientV2;
-{
+
 public struct FrostFsChainTarget(FrostFsTargetType type, string name) : IEquatable<FrostFsChainTarget>
 {
     private ChainTarget? chainTarget;
@@ -60,4 +60,3 @@ namespace FrostFS.SDK.ClientV2
         return Type == other.Type && Name.Equals(other.Name, StringComparison.Ordinal);
     }
 }
-}

src/FrostFS.SDK.ClientV2/Models/Chain/FrostFsChain.cs

@@ -1,7 +1,7 @@
 using Google.Protobuf;
 
-namespace FrostFS.SDK.ClientV2
+namespace FrostFS.SDK.ClientV2;
-{
+
 public struct FrostFsChain(byte[] raw) : System.IEquatable<FrostFsChain>
 {
     private ByteString? grpcRaw;
@@ -39,4 +39,3 @@ namespace FrostFS.SDK.ClientV2
         return Raw == other.Raw;
     }
 }
-}

src/FrostFS.SDK.ClientV2/Models/Chain/FrostFsTargetType.cs

@@ -1,5 +1,5 @@
-namespace FrostFS.SDK.ClientV2
+namespace FrostFS.SDK.ClientV2;
-{
+
 public enum FrostFsTargetType
 {
     Undefined = 0,
@@ -8,4 +8,3 @@
     User,
     Group
 }
-}

src/FrostFS.SDK.ClientV2/Models/Session/FrostFsSessionToken.cs

@@ -1,6 +1,9 @@
+using System;
+
 namespace FrostFS.SDK;
 
-public class FrostFsSessionToken(byte[] token)
+public class FrostFsSessionToken(byte[] token, Guid id)
 {
+    public Guid Id { get; private set; } = id;
     public byte[] Token { get; private set; } = token;
 }

src/FrostFS.SDK.ClientV2/Parameters/CallContext.cs

@@ -11,7 +11,7 @@ using Grpc.Core.Interceptors;
 
 namespace FrostFS.SDK.ClientV2;
 
-public class Context()
+public class CallContext()
 {
     private ReadOnlyCollection<Interceptor>? interceptors;
 

src/FrostFS.SDK.ClientV2/Parameters/IContext.cs

@@ -7,5 +7,5 @@ public interface IContext
     /// callbacks, interceptors.
     /// </summary>
     /// <value>Additional parameters for calling the method</value>
-    Context? Context { get; set; }
+    CallContext? Context { get; set; }
 }

src/FrostFS.SDK.ClientV2/Parameters/PrmBalance.cs

@@ -0,0 +1,5 @@
+namespace FrostFS.SDK.ClientV2;
+
+public sealed class PrmBalance() : PrmBase
+{
+}

src/FrostFS.SDK.ClientV2/Parameters/PrmBase.cs

@@ -10,5 +10,5 @@ public class PrmBase(NameValueCollection? xheaders = null) : IContext
     public NameValueCollection XHeaders { get; } = xheaders ?? [];
 
     /// <inheritdoc />
-    public Context? Context { get; set; }
+    public CallContext? Context { get; set; }
 }

src/FrostFS.SDK.ClientV2/Poll/ClientStatusMonitor.cs

@@ -0,0 +1,165 @@
+using System;
+using System.Threading;
+
+using Microsoft.Extensions.Logging;
+
+namespace FrostFS.SDK.ClientV2;
+
+// clientStatusMonitor count error rate and other statistics for connection.
+public class ClientStatusMonitor : IClientStatus
+{
+    private static readonly MethodIndex[] MethodIndexes =
+    [
+        MethodIndex.methodBalanceGet,
+        MethodIndex.methodContainerPut,
+        MethodIndex.methodContainerGet,
+        MethodIndex.methodContainerList,
+        MethodIndex.methodContainerDelete,
+        MethodIndex.methodEndpointInfo,
+        MethodIndex.methodNetworkInfo,
+        MethodIndex.methodNetMapSnapshot,
+        MethodIndex.methodObjectPut,
+        MethodIndex.methodObjectDelete,
+        MethodIndex.methodObjectGet,
+        MethodIndex.methodObjectHead,
+        MethodIndex.methodObjectRange,
+        MethodIndex.methodObjectPatch,
+        MethodIndex.methodSessionCreate,
+        MethodIndex.methodAPEManagerAddChain,
+        MethodIndex.methodAPEManagerRemoveChain,
+        MethodIndex.methodAPEManagerListChains,
+        MethodIndex.methodLast
+    ];
+
+    public static string GetMethodName(MethodIndex index)
+    {
+        return index switch
+        {
+            MethodIndex.methodBalanceGet => "BalanceGet",
+            MethodIndex.methodContainerPut => "ContainerPut",
+            MethodIndex.methodContainerGet => "ContainerGet",
+            MethodIndex.methodContainerList => "ContainerList",
+            MethodIndex.methodContainerDelete => "ContainerDelete",
+            MethodIndex.methodEndpointInfo => "EndpointInfo",
+            MethodIndex.methodNetworkInfo => "NetworkInfo",
+            MethodIndex.methodNetMapSnapshot => "NetMapSnapshot",
+            MethodIndex.methodObjectPut => "ObjectPut",
+            MethodIndex.methodObjectDelete => "ObjectDelete",
+            MethodIndex.methodObjectGet => "ObjectGet",
+            MethodIndex.methodObjectHead => "ObjectHead",
+            MethodIndex.methodObjectRange => "ObjectRange",
+            MethodIndex.methodObjectPatch => "ObjectPatch",
+            MethodIndex.methodSessionCreate => "SessionCreate",
+            MethodIndex.methodAPEManagerAddChain => "APEManagerAddChain",
+            MethodIndex.methodAPEManagerRemoveChain => "APEManagerRemoveChain",
+            MethodIndex.methodAPEManagerListChains => "APEManagerListChains",
+            _ => throw new NotImplementedException(),
+        };
+    }
+
+    private readonly object _lock = new();
+
+    private readonly ILogger? logger;
+    private int healthy;
+
+    public ClientStatusMonitor(ILogger? logger, string address, uint errorThreshold)
+    {
+        this.logger = logger;
+        healthy = (int)HealthyStatus.Healthy;
+        Address = address;
+        ErrorThreshold = errorThreshold;
+
+        Methods = new MethodStatus[MethodIndexes.Length];
+
+        for (int i = 0; i < MethodIndexes.Length; i++)
+        {
+            Methods[i] = new MethodStatus(GetMethodName(MethodIndexes[i]));
+        }
+    }
+
+    public string Address { get; }
+
+    internal uint ErrorThreshold { get; }
+
+    public uint CurrentErrorCount { get; set; }
+
+    public ulong OverallErrorCount { get; set; }
+
+    public MethodStatus[] Methods { get; private set; }
+
+    public bool IsHealthy()
+    {
+        return Interlocked.CompareExchange(ref healthy, -1, -1) == (int)HealthyStatus.Healthy;
+    }
+
+    public bool IsDialed()
+    {
+        return Interlocked.CompareExchange(ref healthy, -1, -1) != (int)HealthyStatus.UnhealthyOnDial;
+    }
+
+    public void SetHealthy()
+    {
+        Interlocked.Exchange(ref healthy, (int)HealthyStatus.Healthy);
+    }
+    public void SetUnhealthy()
+    {
+        Interlocked.Exchange(ref healthy, (int)HealthyStatus.UnhealthyOnRequest);
+    }
+
+    public void SetUnhealthyOnDial()
+    {
+        Interlocked.Exchange(ref healthy, (int)HealthyStatus.UnhealthyOnDial);
+    }
+
+    public void IncErrorRate()
+    {
+        bool thresholdReached;
+        lock (_lock)
+        {
+            CurrentErrorCount++;
+            OverallErrorCount++;
+
+            thresholdReached = CurrentErrorCount >= ErrorThreshold;
+
+            if (thresholdReached)
+            {
+                SetUnhealthy();
+
+                CurrentErrorCount = 0;
+            }
+        }
+
+        if (thresholdReached)
+        {
+            logger?.Log(LogLevel.Warning, "Error threshold reached. Address {Address}, threshold {Threshold}", Address, ErrorThreshold);
+        }
+    }
+
+    public uint GetCurrentErrorRate()
+    {
+        lock (_lock)
+        {
+            return CurrentErrorCount;
+        }
+    }
+
+    public ulong GetOverallErrorRate()
+    {
+        lock (_lock)
+        {
+            return OverallErrorCount;
+        }
+    }
+
+    public StatusSnapshot[] MethodsStatus()
+    {
+        var result = new StatusSnapshot[Methods.Length];
+
+        for (int i = 0; i < result.Length; i++)
+        {
+            result[i] = Methods[i].Snapshot!;
+        }
+
+        return result;
+    }
+}

src/FrostFS.SDK.ClientV2/Poll/ClientWrapper.cs

@@ -0,0 +1,137 @@
+using System.Threading.Tasks;
+
+namespace FrostFS.SDK.ClientV2;
+
+// clientWrapper is used by default, alternative implementations are intended for testing purposes only.
+public class ClientWrapper
+{
+    private readonly object _lock = new();
+
+    public ClientWrapper(WrapperPrm wrapperPrm)
+    {
+        WrapperPrm = wrapperPrm;
+        StatusMonitor = new ClientStatusMonitor(wrapperPrm.Logger, wrapperPrm.Address, wrapperPrm.ErrorThreshold);
+
+        try
+        {
+            Client = new FrostFSClient(WrapperPrm);
+            StatusMonitor.SetHealthy();
+        }
+        catch (FrostFsException)
+        {
+        }
+    }
+
+    internal FrostFSClient? Client { get; private set; }
+
+    internal WrapperPrm WrapperPrm { get; }
+
+    internal ClientStatusMonitor StatusMonitor { get; }
+
+    internal FrostFSClient? GetClient()
+    {
+        lock (_lock)
+        {
+            if (StatusMonitor.IsHealthy())
+            {
+                return Client;
+            }
+
+            return null;
+        }
+    }
+
+    // dial establishes a connection to the server from the FrostFS network.
+    // Returns an error describing failure reason. If failed, the client
+    // SHOULD NOT be used.
+    internal async Task<string?> Dial(CallContext ctx)
+    {
+        var client = GetClient();
+
+        if (client == null)
+            return "pool client unhealthy";
+
+        var result = await client.Dial(ctx).ConfigureAwait(false);
+        if (!string.IsNullOrEmpty(result))
+        {
+            StatusMonitor.SetUnhealthyOnDial();
+            return result;
+        }
+
+        return null;
+    }
+
+    private async Task ScheduleGracefulClose()
+    {
+        if (Client == null)
+            return;
+
+        await Task.Delay((int)WrapperPrm.GracefulCloseOnSwitchTimeout).ConfigureAwait(false);
+
+        Client.Close();
+    }
+
+    // restartIfUnhealthy checks healthy status of client and recreate it if status is unhealthy.
+    // Indicating if status was changed by this function call and returns error that caused unhealthy status.
+    internal async Task<bool> RestartIfUnhealthy(CallContext ctx)
+    {
+        bool wasHealthy;
+
+        try
+        {
+            var prmNodeInfo = new PrmNodeInfo { Context = ctx };
+            var response = await Client!.GetNodeInfoAsync(prmNodeInfo).ConfigureAwait(false);
+            return false;
+        }
+        catch (FrostFsException)
+        {
+            wasHealthy = true;
+        }
+
+        // if connection is dialed before, to avoid routine/connection leak,
+        // pool has to close it and then initialize once again.
+        if (StatusMonitor.IsDialed())
+        {
+            await ScheduleGracefulClose().ConfigureAwait(false);
+        }
+
+#pragma warning disable CA2000 // Dispose objects before losing scope: will be disposed manually
+        FrostFSClient client = new(WrapperPrm);
+#pragma warning restore CA2000
+
+        //TODO: set additioanl params          
+        var error = await client.Dial(ctx).ConfigureAwait(false);
+        if (!string.IsNullOrEmpty(error))
+        {
+            StatusMonitor.SetUnhealthyOnDial();
+            return wasHealthy;
+        }
+
+        lock (_lock)
+        {
+            Client = client;
+        }
+
+        try
+        {
+            var prmNodeInfo = new PrmNodeInfo { Context = ctx };
+            var res = await client.GetNodeInfoAsync(prmNodeInfo).ConfigureAwait(false);
+        }
+        catch (FrostFsException)
+        {
+            StatusMonitor.SetUnhealthy();
+            return wasHealthy;
+        }
+
+        StatusMonitor.SetHealthy();
+        return !wasHealthy;
+    }
+
+    internal void IncRequests(ulong elapsed, MethodIndex method)
+    {
+        var methodStat = StatusMonitor.Methods[(int)method];
+
+        methodStat.IncRequests(elapsed);
+    }
+}
+

src/FrostFS.SDK.ClientV2/Poll/DialOptions.cs

@@ -0,0 +1,16 @@
+namespace FrostFS.SDK.ClientV2;
+
+public class DialOptions
+{
+    public bool Block { get; set; }
+
+    public bool ReturnLastError { get; set; }
+
+    public ulong Timeout { get; set; }
+
+    public string? Authority { get; set; }
+
+    public bool DisableRetry { get; set; }
+
+    public bool DisableHealthCheck { get; set; }
+}

src/FrostFS.SDK.ClientV2/Poll/HealthyStatus.cs

@@ -0,0 +1,18 @@
+namespace FrostFS.SDK.ClientV2;
+
+// values for healthy status of clientStatusMonitor.
+public enum HealthyStatus
+{
+    // statusUnhealthyOnDial is set when dialing to the endpoint is failed,
+    // so there is no connection to the endpoint, and pool should not close it
+    // before re-establishing connection once again.
+    UnhealthyOnDial,
+
+    // statusUnhealthyOnRequest is set when communication after dialing to the
+    // endpoint is failed due to immediate or accumulated errors, connection is
+    // available and pool should close it before re-establishing connection once again.
+    UnhealthyOnRequest,
+
+    // statusHealthy is set when connection is ready to be used by the pool.
+    Healthy
+}

src/FrostFS.SDK.ClientV2/Poll/IClientStatus.cs

@@ -0,0 +1,28 @@
+namespace FrostFS.SDK.ClientV2;
+
+public interface IClientStatus
+{
+    // isHealthy checks if the connection can handle requests.
+    bool IsHealthy();
+
+    // isDialed checks if the connection was created.
+    bool IsDialed();
+
+    // setUnhealthy marks client as unhealthy.
+    void SetUnhealthy();
+
+    // address return address of endpoint.
+    string Address { get; }
+
+    // currentErrorRate returns current errors rate.
+    // After specific threshold connection is considered as unhealthy.
+    // Pool.startRebalance routine can make this connection healthy again.
+    uint GetCurrentErrorRate();
+
+    // overallErrorRate returns the number of all happened errors.
+    ulong GetOverallErrorRate();
+
+    // methodsStatus returns statistic for all used methods.
+    StatusSnapshot[] MethodsStatus();
+}
+

src/FrostFS.SDK.ClientV2/Poll/InitParameters.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Security.Cryptography;
+
+using Microsoft.Extensions.Logging;
+
+namespace FrostFS.SDK.ClientV2;
+
+// InitParameters contains values used to initialize connection Pool.
+public class InitParameters
+{
+    public ECDsa? Key { get; set; }
+
+    public ulong NodeDialTimeout { get; set; }
+
+    public ulong NodeStreamTimeout { get; set; }
+
+    public ulong HealthcheckTimeout { get; set; }
+
+    public ulong ClientRebalanceInterval { get; set; }
+
+    public ulong SessionExpirationDuration { get; set; }
+
+    public uint ErrorThreshold { get; set; }
+
+    public NodeParam[]? NodeParams { get; set; }
+
+    public DialOptions[]? DialOptions { get; set; }
+
+    public Func<string, ClientWrapper>? ClientBuilder { get; set; }
+
+    public ulong GracefulCloseOnSwitchTimeout { get; set; }
+
+    public ILogger? Logger { get; set; }
+}

src/FrostFS.SDK.ClientV2/Poll/InnerPool.cs

@@ -0,0 +1,47 @@
+using FrostFS.SDK.ClientV2;
+
+internal sealed class InnerPool
+{
+    private readonly object _lock = new();
+
+    internal InnerPool(Sampler sampler, ClientWrapper[] clients)
+    {
+        Clients = clients;
+        Sampler = sampler;
+    }
+
+    internal Sampler Sampler { get; set; }
+
+    internal ClientWrapper[] Clients { get; }
+
+    internal ClientWrapper? Connection()
+    {
+        lock (_lock)
+        {
+            if (Clients.Length == 1)
+            {
+                var client = Clients[0];
+                if (client.StatusMonitor.IsHealthy())
+                {
+                    return client;
+                }
+            }
+            else
+            {
+                var attempts = 3 * Clients.Length;
+
+                for (int i = 0; i < attempts; i++)
+                {
+                    int index = Sampler.Next();
+
+                    if (Clients[index].StatusMonitor.IsHealthy())
+                    {
+                        return Clients[index];
+                    }
+                }
+            }
+
+            return null;
+        }
+    }
+}

src/FrostFS.SDK.ClientV2/Poll/MethodIndex.cs

@@ -0,0 +1,24 @@
+namespace FrostFS.SDK.ClientV2;
+
+public enum MethodIndex
+{
+    methodBalanceGet,
+    methodContainerPut,
+    methodContainerGet,
+    methodContainerList,
+    methodContainerDelete,
+    methodEndpointInfo,
+    methodNetworkInfo,
+    methodNetMapSnapshot,
+    methodObjectPut,
+    methodObjectDelete,
+    methodObjectGet,
+    methodObjectHead,
+    methodObjectRange,
+    methodObjectPatch,
+    methodSessionCreate,
+    methodAPEManagerAddChain,
+    methodAPEManagerRemoveChain,
+    methodAPEManagerListChains,
+    methodLast
+}

src/FrostFS.SDK.ClientV2/Poll/MethodStatus.cs

@@ -0,0 +1,19 @@
+namespace FrostFS.SDK.ClientV2;
+
+public class MethodStatus(string name)
+{
+    private readonly object _lock = new();
+
+    public string Name { get; } = name;
+
+    public StatusSnapshot Snapshot { get; set; } = new StatusSnapshot();
+
+    internal void IncRequests(ulong elapsed)
+    {
+        lock (_lock)
+        {
+            Snapshot.AllTime += elapsed;
+            Snapshot.AllRequests++;
+        }
+    }
+}

src/FrostFS.SDK.ClientV2/Poll/NodeParam.cs

@@ -0,0 +1,12 @@
+namespace FrostFS.SDK.ClientV2;
+
+// NodeParam groups parameters of remote node.
+[System.Diagnostics.CodeAnalysis.SuppressMessage("Performance", "CA1815:Override equals and operator equals on value types", Justification = "<Pending>")]
+public readonly struct NodeParam(int priority, string address, float weight)
+{
+    public int Priority { get; } = priority;
+
+    public string Address { get; } = address;
+
+    public float Weight { get; } = weight;
+}

src/FrostFS.SDK.ClientV2/Poll/NodeStatistic.cs

@@ -0,0 +1,12 @@
+namespace FrostFS.SDK.ClientV2;
+
+public class NodeStatistic
+{
+    public string? Address { get; internal set; }
+
+    public StatusSnapshot[]? Methods { get; internal set; }
+
+    public ulong OverallErrors { get; internal set; }
+
+    public uint CurrentErrors { get; internal set; }
+}

src/FrostFS.SDK.ClientV2/Poll/NodesParam.cs

@@ -0,0 +1,12 @@
+using System.Collections.ObjectModel;
+
+namespace FrostFS.SDK.ClientV2;
+
+public class NodesParam(int priority)
+{
+    public int Priority { get; } = priority;
+
+    public Collection<string> Addresses { get; } = [];
+
+    public Collection<double> Weights { get; } = [];
+}

src/FrostFS.SDK.ClientV2/Poll/Pool.cs

@@ -0,0 +1,651 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Security.Cryptography;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+
+using Frostfs.V2.Ape;
+
+using FrostFS.Refs;
+using FrostFS.SDK.ClientV2.Interfaces;
+using FrostFS.SDK.ClientV2.Mappers.GRPC;
+using FrostFS.SDK.Cryptography;
+
+using Microsoft.Extensions.Logging;
+
+
+namespace FrostFS.SDK.ClientV2;
+
+public partial class Pool : IFrostFSClient
+{
+    const int defaultSessionTokenExpirationDuration = 100; // in epochs
+
+    const int defaultErrorThreshold = 100;
+
+    const int defaultGracefulCloseOnSwitchTimeout = 10; //Seconds;
+    const int defaultRebalanceInterval = 15; //Seconds;
+    const int defaultHealthcheckTimeout = 4; //Seconds;
+    const int defaultDialTimeout = 5; //Seconds;
+    const int defaultStreamTimeout = 10; //Seconds;
+
+    private readonly object _lock = new();
+
+    private InnerPool[]? InnerPools { get; set; }
+
+    private ECDsa Key { get; set; }
+
+    private byte[] PublicKey { get; }
+
+    private OwnerID? _ownerId;
+    private FrostFsOwner? _owner;
+
+    private FrostFsOwner Owner
+    {
+        get
+        {
+            _owner ??= new FrostFsOwner(Key.PublicKey().PublicKeyToAddress());
+            return _owner;
+        }
+    }
+
+    private OwnerID OwnerId
+    {
+        get
+        {
+            if (_ownerId == null)
+            {
+                _owner = new FrostFsOwner(Key.PublicKey().PublicKeyToAddress());
+                _ownerId = _owner.ToMessage();
+            }
+            return _ownerId;
+        }
+    }
+
+    internal CancellationTokenSource CancellationTokenSource { get; } = new CancellationTokenSource();
+
+    private SessionCache Cache { get; set; }
+
+    private ulong SessionTokenDuration { get; set; }
+
+    private RebalanceParameters RebalanceParams { get; set; }
+
+    private Func<string, ClientWrapper> ClientBuilder;
+
+    private bool disposedValue;
+
+    private ILogger? Logger { get; set; }
+
+    private ulong MaxObjectSize { get; set; }
+
+    public IClientStatus? ClientStatus { get; }
+
+    // NewPool creates connection pool using parameters.
+    public Pool(InitParameters options)
+    {
+        if (options is null)
+        {
+            throw new ArgumentNullException(nameof(options));
+        }
+
+        if (options.Key == null)
+        {
+            throw new FrostFsException($"Missed required parameter {nameof(options.Key)}");
+        }
+
+        var nodesParams = AdjustNodeParams(options.NodeParams);
+
+        var cache = new SessionCache(options.SessionExpirationDuration);
+
+        FillDefaultInitParams(options, cache);
+
+        Key = options.Key;
+        PublicKey = Key.PublicKey();
+
+        Cache = cache;
+        Logger = options.Logger;
+        SessionTokenDuration = options.SessionExpirationDuration;
+
+        RebalanceParams = new RebalanceParameters(
+            nodesParams.ToArray(),
+            options.HealthcheckTimeout,
+            options.ClientRebalanceInterval,
+            options.SessionExpirationDuration);
+
+        ClientBuilder = options.ClientBuilder!;
+    }
+
+    private void SetupContext(CallContext ctx)
+    {
+        if (ctx == null)
+        {
+            throw new ArgumentNullException(nameof(ctx));
+        }
+
+        ctx.Key ??= Key;
+    }
+
+    // Dial establishes a connection to the servers from the FrostFS network.
+    // It also starts a routine that checks the health of the nodes and
+    // updates the weights of the nodes for balancing.
+    // Returns an error describing failure reason.
+    //
+    // If failed, the Pool SHOULD NOT be used.
+    //
+    // See also InitParameters.SetClientRebalanceInterval.
+    public async Task<string?> Dial(CallContext ctx)
+    {
+        SetupContext(ctx);
+
+        var inner = new InnerPool[RebalanceParams.NodesParams.Length];
+
+        bool atLeastOneHealthy = false;
+        int i = 0;
+        foreach (var nodeParams in RebalanceParams.NodesParams)
+        {
+            var clients = new ClientWrapper[nodeParams.Weights.Count];
+
+            for (int j = 0; j < nodeParams.Addresses.Count; j++)
+            {
+                var client = ClientBuilder(nodeParams.Addresses[j]);
+                clients[j] = client;
+
+                var error = await client.Dial(ctx).ConfigureAwait(false);
+                if (!string.IsNullOrEmpty(error))
+                {
+                    Logger?.LogWarning("Failed to build client. Address {Address}, {Error})", client.WrapperPrm.Address, error);
+                    continue;
+                }
+
+                try
+                {
+                    var token = await InitSessionForDuration(ctx, client, RebalanceParams.SessionExpirationDuration, Key, false)
+                        .ConfigureAwait(false);
+
+                    var key = FormCacheKey(nodeParams.Addresses[j], Key, false);
+                    _ = Cache.Cache[key] = token;
+                }
+                catch (FrostFsException ex)
+                {
+                    client.StatusMonitor.SetUnhealthy();
+                    Logger?.LogWarning("Failed to create frostfs session token for client. Address {Address}, {Error})",
+                        client.WrapperPrm.Address, ex.Message);
+
+                    continue;
+                }
+
+                atLeastOneHealthy = true;
+            }
+
+            var sampler = new Sampler(nodeParams.Weights.ToArray());
+
+            inner[i] = new InnerPool(sampler, clients);
+        }
+
+        if (!atLeastOneHealthy)
+            return "at least one node must be healthy";
+
+        InnerPools = inner;
+
+        var res = await GetNetworkSettingsAsync(new PrmNetworkSettings { Context = ctx }).ConfigureAwait(false);
+
+        MaxObjectSize = res.MaxObjectSize;
+
+        StartRebalance(ctx);
+
+        return null;
+    }
+
+    private static IEnumerable<NodesParam> AdjustNodeParams(NodeParam[]? nodeParams)
+    {
+        if (nodeParams == null || nodeParams.Length == 0)
+        {
+            throw new ArgumentException("No FrostFS peers configured");
+        }
+
+        Dictionary<int, NodesParam> nodesParamsDict = new(nodeParams.Length);
+        foreach (var nodeParam in nodeParams)
+        {
+            if (!nodesParamsDict.TryGetValue(nodeParam.Priority, out var nodes))
+            {
+                nodes = new NodesParam(nodeParam.Priority);
+                nodesParamsDict[nodeParam.Priority] = nodes;
+            }
+
+            nodes.Addresses.Add(nodeParam.Address);
+            nodes.Weights.Add(nodeParam.Weight);
+        }
+
+        var nodesParams = new List<NodesParam>(nodesParamsDict.Count);
+
+        foreach (var key in nodesParamsDict.Keys)
+        {
+            var nodes = nodesParamsDict[key];
+            var newWeights = AdjustWeights([.. nodes.Weights]);
+            nodes.Weights.Clear();
+            foreach (var weight in newWeights)
+            {
+                nodes.Weights.Add(weight);
+            }
+
+            nodesParams.Add(nodes);
+        }
+
+        return nodesParams.OrderBy(n => n.Priority);
+    }
+
+    private static double[] AdjustWeights(double[] weights)
+    {
+        var adjusted = new double[weights.Length];
+
+        var sum = weights.Sum();
+
+        if (sum > 0)
+        {
+            for (int i = 0; i < weights.Length; i++)
+            {
+                adjusted[i] = weights[i] / sum;
+            }
+        }
+
+        return adjusted;
+    }
+
+    private static void FillDefaultInitParams(InitParameters parameters, SessionCache cache)
+    {
+        if (parameters.SessionExpirationDuration == 0)
+            parameters.SessionExpirationDuration = defaultSessionTokenExpirationDuration;
+
+        if (parameters.ErrorThreshold == 0)
+            parameters.ErrorThreshold = defaultErrorThreshold;
+
+        if (parameters.ClientRebalanceInterval <= 0)
+            parameters.ClientRebalanceInterval = defaultRebalanceInterval;
+
+        if (parameters.GracefulCloseOnSwitchTimeout <= 0)
+            parameters.GracefulCloseOnSwitchTimeout = defaultGracefulCloseOnSwitchTimeout;
+
+        if (parameters.HealthcheckTimeout <= 0)
+            parameters.HealthcheckTimeout = defaultHealthcheckTimeout;
+
+        if (parameters.NodeDialTimeout <= 0)
+            parameters.NodeDialTimeout = defaultDialTimeout;
+
+        if (parameters.NodeStreamTimeout <= 0)
+            parameters.NodeStreamTimeout = defaultStreamTimeout;
+
+        if (cache.TokenDuration == 0)
+            cache.TokenDuration = defaultSessionTokenExpirationDuration;
+
+        parameters.ClientBuilder ??= new Func<string, ClientWrapper>((address) =>
+            {
+                var wrapperPrm = new WrapperPrm
+                {
+                    Address = address,
+                    Key = parameters.Key,
+                    Logger = parameters.Logger,
+                    DialTimeout = parameters.NodeDialTimeout,
+                    StreamTimeout = parameters.NodeStreamTimeout,
+                    ErrorThreshold = parameters.ErrorThreshold,
+                    GracefulCloseOnSwitchTimeout = parameters.GracefulCloseOnSwitchTimeout
+                };
+
+                return new ClientWrapper(wrapperPrm);
+            }
+        );
+    }
+
+    private FrostFSClient? Сonnection()
+    {
+        foreach (var pool in InnerPools!)
+        {
+            var client = pool.Connection();
+            if (client != null)
+            {
+                return client.Client;
+            }
+        }
+
+        return null;
+    }
+
+    private static async Task<FrostFsSessionToken?> InitSessionForDuration(CallContext ctx, ClientWrapper cw, ulong duration, ECDsa key, bool clientCut)
+    {
+        var client = cw.Client;
+        var networkInfo = await client!.GetNetworkSettingsAsync(new PrmNetworkSettings { Context = ctx }).ConfigureAwait(false);
+
+        var epoch = networkInfo.Epoch;
+
+        ulong exp = ulong.MaxValue - epoch < duration
+            ? ulong.MaxValue
+            : epoch + duration;
+
+        var prmSessionCreate = new PrmSessionCreate(exp) { Context = ctx };
+
+        return await client.CreateSessionAsync(prmSessionCreate).ConfigureAwait(false);
+    }
+
+    private static string FormCacheKey(string address, ECDsa key, bool clientCut)
+    {
+        var k = key.PrivateKey;
+        var stype = clientCut ? "client" : "server";
+
+        return $"{address}{stype}{k}";
+    }
+
+    public void Close()
+    {
+        CancellationTokenSource.Cancel();
+
+        if (InnerPools != null)
+        {
+            // close all clients
+            foreach (var innerPool in InnerPools)
+                foreach (var client in innerPool.Clients)
+                    if (client.StatusMonitor.IsDialed())
+                        client.Client?.Close();
+        }
+    }
+
+    // startRebalance runs loop to monitor connection healthy status.
+    internal void StartRebalance(CallContext ctx)
+    {
+        var buffers = new double[RebalanceParams.NodesParams.Length][];
+
+        for (int i = 0; i < RebalanceParams.NodesParams.Length; i++)
+        {
+            var parameters = this.RebalanceParams.NodesParams[i];
+            buffers[i] = new double[parameters.Weights.Count];
+
+            Task.Run(async () =>
+            {
+                await Task.Delay((int)RebalanceParams.ClientRebalanceInterval).ConfigureAwait(false);
+                UpdateNodesHealth(ctx, buffers);
+            });
+        }
+    }
+
+    private void UpdateNodesHealth(CallContext ctx, double[][] buffers)
+    {
+        var tasks = new Task[InnerPools!.Length];
+
+        for (int i = 0; i < InnerPools.Length; i++)
+        {
+            var bufferWeights = buffers[i];
+
+            tasks[i] = Task.Run(() => UpdateInnerNodesHealth(ctx, i, bufferWeights));
+        }
+
+        Task.WaitAll(tasks);
+    }
+
+    private async ValueTask UpdateInnerNodesHealth(CallContext ctx, int poolIndex, double[] bufferWeights)
+    {
+        if (poolIndex > InnerPools!.Length - 1)
+        {
+            return;
+        }
+
+        var pool = InnerPools[poolIndex];
+
+        var options = RebalanceParams;
+
+        int healthyChanged = 0;
+
+        var tasks = new Task[pool.Clients.Length];
+
+        for (int j = 0; j < pool.Clients.Length; j++)
+        {
+            var client = pool.Clients[j];
+            var healthy = false;
+            string? error = null;
+            var changed = false;
+
+            try
+            {
+                // check timeout settings
+                changed = await client.RestartIfUnhealthy(ctx).ConfigureAwait(false);
+                healthy = true;
+                bufferWeights[j] = options.NodesParams[poolIndex].Weights[j];
+            }
+            catch (FrostFsException e)
+            {
+                error = e.Message;
+                bufferWeights[j] = 0;
+
+                Cache.DeleteByPrefix(client.StatusMonitor.Address);
+            }
+
+            if (changed)
+            {
+                StringBuilder fields = new($"address {client.StatusMonitor.Address}, healthy {healthy}");
+                if (string.IsNullOrEmpty(error))
+                {
+                    fields.Append($", reason {error}");
+                    Logger?.Log(LogLevel.Warning, "Health has changed: {Fields}", fields.ToString());
+
+                    Interlocked.Exchange(ref healthyChanged, 1);
+                }
+            }
+
+            await Task.WhenAll(tasks).ConfigureAwait(false);
+
+            if (Interlocked.CompareExchange(ref healthyChanged, -1, -1) == 1)
+            {
+                var probabilities = AdjustWeights(bufferWeights);
+
+                lock (_lock)
+                {
+                    pool.Sampler = new Sampler(probabilities);
+                }
+            }
+        }
+    }
+
+    private bool CheckSessionTokenErr(Exception error, string address)
+    {
+        if (error == null)
+        {
+            return false;
+        }
+
+        if (error is SessionNotFoundException || error is SessionExpiredException)
+        {
+            this.Cache.DeleteByPrefix(address);
+            return true;
+        }
+
+        return false;
+    }
+
+    public Statistic Statistic()
+    {
+        if (InnerPools == null)
+        {
+            throw new InvalidObjectException(nameof(Pool));
+        }
+
+        var statistics = new Statistic();
+
+        foreach (var inner in InnerPools)
+        {
+            int nodeIndex = 0;
+            int valueIndex = 0;
+            var nodes = new string[inner.Clients.Length];
+
+            lock (_lock)
+            {
+                foreach (var client in inner.Clients)
+                {
+                    if (client.StatusMonitor.IsHealthy())
+                    {
+                        nodes[valueIndex++] = client.StatusMonitor.Address;
+                    }
+
+                    var node = new NodeStatistic
+                    {
+                        Address = client.StatusMonitor.Address,
+                        Methods = client.StatusMonitor.MethodsStatus(),
+                        OverallErrors = client.StatusMonitor.GetOverallErrorRate(),
+                        CurrentErrors = client.StatusMonitor.GetCurrentErrorRate()
+                    };
+
+                    statistics.Nodes[nodeIndex++] = node;
+
+                    statistics.OverallErrors += node.OverallErrors;
+                }
+
+                if (statistics.CurrentNodes == null || statistics.CurrentNodes.Length == 0)
+                {
+                    statistics.CurrentNodes = nodes;
+                }
+            }
+        }
+
+        return statistics;
+    }
+
+    public async Task<FrostFsNetmapSnapshot> GetNetmapSnapshotAsync(PrmNetmapSnapshot? args = null)
+    {
+        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        return await client.GetNetmapSnapshotAsync(args).ConfigureAwait(false);
+    }
+
+    public async Task<FrostFsNodeInfo> GetNodeInfoAsync(PrmNodeInfo? args = null)
+    {
+        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        return await client.GetNodeInfoAsync(args).ConfigureAwait(false);
+    }
+
+    public async Task<NetworkSettings> GetNetworkSettingsAsync(PrmNetworkSettings? args = null)
+    {
+        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        return await client.GetNetworkSettingsAsync(args).ConfigureAwait(false);
+    }
+
+    public async Task<FrostFsSessionToken> CreateSessionAsync(PrmSessionCreate args)
+    {
+        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        return await client.CreateSessionAsync(args).ConfigureAwait(false);
+    }
+
+    public async Task<byte[]> AddChainAsync(PrmApeChainAdd args)
+    {
+        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        return await client.AddChainAsync(args).ConfigureAwait(false);
+    }
+
+    public async Task RemoveChainAsync(PrmApeChainRemove args)
+    {
+        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        await client.RemoveChainAsync(args).ConfigureAwait(false);
+    }
+
+    public async Task<Chain[]> ListChainAsync(PrmApeChainList args)
+    {
+        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        return await client.ListChainAsync(args).ConfigureAwait(false);
+    }
+
+    public async Task<FrostFsContainerInfo> GetContainerAsync(PrmContainerGet args)
+    {
+        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        return await client.GetContainerAsync(args).ConfigureAwait(false);
+    }
+
+    public IAsyncEnumerable<FrostFsContainerId> ListContainersAsync(PrmContainerGetAll? args = null)
+    {
+        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        return client.ListContainersAsync(args);
+    }
+
+    public async Task<FrostFsContainerId> CreateContainerAsync(PrmContainerCreate args)
+    {
+        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        return await client.CreateContainerAsync(args).ConfigureAwait(false);
+    }
+
+    public async Task DeleteContainerAsync(PrmContainerDelete args)
+    {
+        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        await client.DeleteContainerAsync(args).ConfigureAwait(false);
+    }
+
+    public async Task<FrostFsObjectHeader> GetObjectHeadAsync(PrmObjectHeadGet args)
+    {
+        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        return await client.GetObjectHeadAsync(args).ConfigureAwait(false);
+    }
+
+    public async Task<FrostFsObject> GetObjectAsync(PrmObjectGet args)
+    {
+        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        return await client.GetObjectAsync(args).ConfigureAwait(false);
+    }
+
+    public async Task<FrostFsObjectId> PutObjectAsync(PrmObjectPut args)
+    {
+        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        return await client.PutObjectAsync(args).ConfigureAwait(false);
+    }
+
+    public async Task<FrostFsObjectId> PutSingleObjectAsync(PrmSingleObjectPut args)
+    {
+        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        return await client.PutSingleObjectAsync(args).ConfigureAwait(false);
+    }
+
+    public async Task DeleteObjectAsync(PrmObjectDelete args)
+    {
+        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        await client.DeleteObjectAsync(args).ConfigureAwait(false);
+    }
+
+    public IAsyncEnumerable<FrostFsObjectId> SearchObjectsAsync(PrmObjectSearch args)
+    {
+        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        return client.SearchObjectsAsync(args);
+    }
+
+    public async Task<Accounting.Decimal> GetBalanceAsync(PrmBalance? args = null)
+    {
+        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        return await client.GetBalanceAsync(args).ConfigureAwait(false);
+    }
+
+    public bool RestartIfUnhealthy(CallContext ctx)
+    {
+        throw new NotImplementedException();
+    }
+
+    public bool IsHealthy()
+    {
+        throw new NotImplementedException();
+    }
+
+    protected virtual void Dispose(bool disposing)
+    {
+        if (!disposedValue)
+        {
+            if (disposing)
+            {
+                Close();
+            }
+
+            disposedValue = true;
+        }
+    }
+
+    public void Dispose()
+    {
+        // Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
+        Dispose(disposing: true);
+        GC.SuppressFinalize(this);
+    }
+
+    public FrostFsObjectId CalculateObjectId(FrostFsObjectHeader header, CallContext ctx)
+    {
+        throw new NotImplementedException();
+    }
+}

src/FrostFS.SDK.ClientV2/Poll/RebalanceParameters.cs

@@ -0,0 +1,16 @@
+namespace FrostFS.SDK.ClientV2;
+
+public class RebalanceParameters(
+    NodesParam[] nodesParams,
+    ulong nodeRequestTimeout,
+    ulong clientRebalanceInterval, 
+    ulong sessionExpirationDuration)
+{
+    public NodesParam[] NodesParams { get; set; } = nodesParams;
+
+    public ulong NodeRequestTimeout { get; set; } = nodeRequestTimeout;
+
+    public ulong ClientRebalanceInterval { get; set; } = clientRebalanceInterval;
+
+    public ulong SessionExpirationDuration { get; set; } = sessionExpirationDuration;
+}

src/FrostFS.SDK.ClientV2/Poll/RequestInfo.cs

@@ -0,0 +1,14 @@
+using System;
+
+namespace FrostFS.SDK.ClientV2;
+
+// RequestInfo groups info about pool request.
+struct RequestInfo
+{
+    public string Address { get; set; }
+
+    public MethodIndex MethodIndex { get; set; }
+
+    public TimeSpan Elapsed { get; set; }
+}
+

src/FrostFS.SDK.ClientV2/Poll/Sampler.cs

@@ -0,0 +1,85 @@
+using System;
+
+namespace FrostFS.SDK.ClientV2;
+
+internal sealed class Sampler
+{
+    private readonly object _lock = new();
+
+    private Random random = new();
+
+    internal double[] Probabilities { get; set; }
+    internal int[] Alias { get; set; }
+
+    internal Sampler(double[] probabilities)
+    {
+        var small = new WorkList();
+        var large = new WorkList();
+
+        var n = probabilities.Length;
+
+        //  sampler.randomGenerator = rand.New(source)
+        Probabilities = new double[n];
+        Alias = new int[n];
+
+        // Compute scaled probabilities.
+        var p = new double[n];
+
+        for (int i = 0; i < n; i++)
+        {
+            p[i] = probabilities[i] * n;
+            if (p[i] < 1)
+                small.Add(i);
+            else
+                large.Add(i);
+        }
+
+        while (small.Length > 0 && large.Length > 0)
+        {
+            var l = small.Remove();
+            var g = large.Remove();
+
+            Probabilities[l] = p[l];
+            Alias[l] = g;
+
+            p[g] = p[g] + p[l] - 1;
+
+            if (p[g] < 1)
+                small.Add(g);
+            else
+                large.Add(g);
+        }
+
+        while (large.Length > 0)
+        {
+            var g = large.Remove();
+            Probabilities[g] = 1;
+        }
+
+        while (small.Length > 0)
+        {
+            var l = small.Remove();
+            probabilities[l] = 1;
+        }
+    }
+
+    internal int Next()
+    {
+        var n = Alias.Length;
+
+        int i;
+        double f;
+        lock (_lock)
+        {
+            i = random.Next(0, n - 1);
+            f = random.NextDouble();
+        }
+
+        if (f < Probabilities[i])
+        {
+            return i;
+        }
+
+        return Alias[i];
+    }
+}

src/FrostFS.SDK.ClientV2/Poll/SessionCache.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Collections;
+
+namespace FrostFS.SDK.ClientV2;
+
+internal struct SessionCache
+{
+    public SessionCache(ulong sessionExpirationDuration)
+    {
+        TokenDuration = sessionExpirationDuration;
+    }
+
+    internal Hashtable Cache { get; } = [];
+
+    internal ulong CurrentEpoch { get; set; }
+
+    internal ulong TokenDuration { get; set; }
+
+    internal void DeleteByPrefix(string prefix)
+    {
+        foreach (var key in Cache.Keys)
+        {
+            if (((string)key).StartsWith(prefix, StringComparison.Ordinal))
+            {
+                Cache.Remove(key);
+            }
+        }
+    }
+}

src/FrostFS.SDK.ClientV2/Poll/Statistic.cs

@@ -0,0 +1,12 @@
+using System.Collections.ObjectModel;
+
+namespace FrostFS.SDK.ClientV2;
+
+public sealed class Statistic
+{
+    public ulong OverallErrors { get; internal set; }
+
+    public Collection<NodeStatistic> Nodes { get; } = [];
+
+    public string[]? CurrentNodes { get; internal set; }
+}

src/FrostFS.SDK.ClientV2/Poll/StatusSnapshot.cs

@@ -0,0 +1,8 @@
+namespace FrostFS.SDK.ClientV2;
+
+public class StatusSnapshot()
+{
+    public ulong AllTime { get; internal set; }
+
+    public ulong AllRequests { get; internal set; }
+}

src/FrostFS.SDK.ClientV2/Poll/WorkList.cs

@@ -0,0 +1,26 @@
+using System.Collections.Generic;
+using System.Linq;
+
+namespace FrostFS.SDK.ClientV2;
+
+internal sealed class WorkList
+{
+    private readonly List<int> elements = [];
+
+    internal int Length
+    {
+        get { return elements.Count; }
+    }
+
+    internal void Add(int element)
+    {
+        elements.Add(element);
+    }
+
+    internal int Remove()
+    {
+        int last = elements.LastOrDefault();
+        elements.RemoveAt(elements.Count - 1);
+        return last;
+    }
+}

src/FrostFS.SDK.ClientV2/Poll/WrapperPrm.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Security.Cryptography;
+
+using Grpc.Net.Client;
+
+using Microsoft.Extensions.Logging;
+
+namespace FrostFS.SDK.ClientV2;
+
+// wrapperPrm is params to create clientWrapper.
+[System.Diagnostics.CodeAnalysis.SuppressMessage("Performance", "CA1815:Override equals and operator equals on value types", Justification = "<Pending>")]
+public struct WrapperPrm
+{
+    internal ILogger? Logger { get; set; }
+
+    internal string Address { get; set; }
+
+    internal ECDsa? Key { get; set; }
+
+    internal ulong DialTimeout { get; set; }
+
+    internal ulong StreamTimeout { get; set; }
+
+    internal uint ErrorThreshold { get; set; }
+
+    internal Action ResponseInfoCallback { get; set; }
+
+    internal Action PoolRequestInfoCallback { get; set; }
+
+    internal GrpcChannelOptions GrpcChannelOptions { get; set; }
+
+    internal ulong GracefulCloseOnSwitchTimeout { get; set; }
+}
+

src/FrostFS.SDK.ClientV2/Services/AccountingServiceProvider.cs

@@ -0,0 +1,40 @@
+using System.Threading.Tasks;
+
+using FrostFS.Accounting;
+
+namespace FrostFS.SDK.ClientV2;
+
+internal sealed class AccountingServiceProvider : ContextAccessor
+{
+    private readonly AccountingService.AccountingServiceClient? _accountingServiceClient;
+
+    internal AccountingServiceProvider(
+        AccountingService.AccountingServiceClient? accountingServiceClient,
+        EnvironmentContext context)
+        : base(context)
+    {
+        _accountingServiceClient = accountingServiceClient;
+    }
+
+    internal async Task<Decimal> GetBallance(PrmBalance args)
+    {
+        var ctx = args.Context!;
+
+        BalanceRequest request = new()
+        {
+            Body = new()
+            {
+                OwnerId = ctx.OwnerId!.OwnerID
+            }
+        };
+
+        request.AddMetaHeader(args.XHeaders);
+        request.Sign(ctx.Key!);
+
+        var response = await _accountingServiceClient!.BalanceAsync(request, null, ctx.Deadline, ctx.CancellationToken);
+
+        Verifier.CheckResponse(response);
+
+        return response.Body.Balance;
+    }
+}

src/FrostFS.SDK.ClientV2/Services/ApeManagerServiceProvider.cs

@@ -3,13 +3,13 @@ using System.Threading.Tasks;
 using Frostfs.V2.Ape;
 using Frostfs.V2.Apemanager;
 
-namespace FrostFS.SDK.ClientV2;
+namespace FrostFS.SDK.ClientV2.Services;
 
 internal sealed class ApeManagerServiceProvider : ContextAccessor
 {
     private readonly APEManagerService.APEManagerServiceClient? _apeManagerServiceClient;
 
-    internal ApeManagerServiceProvider(APEManagerService.APEManagerServiceClient? apeManagerServiceClient, ClientEnvironment context)
+    internal ApeManagerServiceProvider(APEManagerService.APEManagerServiceClient? apeManagerServiceClient, EnvironmentContext context)
         : base(context)
     {
         _apeManagerServiceClient = apeManagerServiceClient;
@@ -18,7 +18,7 @@ internal sealed class ApeManagerServiceProvider : ContextAccessor
     internal async Task<byte[]> AddChainAsync(PrmApeChainAdd args)
     {
         var ctx = args.Context!;
-        ctx.Key ??= Context.Key?.ECDsaKey;
+        ctx.Key ??= EnvironmentContext.Key?.ECDsaKey;
 
         if (ctx.Key == null)
             throw new InvalidObjectException(nameof(ctx.Key));
@@ -45,7 +45,7 @@ internal sealed class ApeManagerServiceProvider : ContextAccessor
     internal async Task RemoveChainAsync(PrmApeChainRemove args)
     {
         var ctx = args.Context!;
-        ctx.Key ??= Context.Key?.ECDsaKey;
+        ctx.Key ??= EnvironmentContext.Key?.ECDsaKey;
 
         if (ctx.Key == null)
             throw new InvalidObjectException(nameof(ctx.Key));
@@ -70,7 +70,7 @@ internal sealed class ApeManagerServiceProvider : ContextAccessor
     internal async Task<Chain[]> ListChainAsync(PrmApeChainList args)
     {
         var ctx = args.Context!;
-        ctx.Key ??= Context.Key?.ECDsaKey;
+        ctx.Key ??= EnvironmentContext.Key?.ECDsaKey;
 
         if (ctx.Key == null)
             throw new InvalidObjectException(nameof(ctx.Key));

src/FrostFS.SDK.ClientV2/Services/ContainerServiceProvider.cs

@@ -12,11 +12,11 @@ using FrostFS.Session;
 
 namespace FrostFS.SDK.ClientV2;
 
-internal sealed class ContainerServiceProvider(ContainerService.ContainerServiceClient service, ClientEnvironment context) : ContextAccessor(context), ISessionProvider
+internal sealed class ContainerServiceProvider(ContainerService.ContainerServiceClient service, EnvironmentContext envCtx) : ContextAccessor(envCtx), ISessionProvider
 {
-    readonly SessionProvider sessions = new(context);
+    readonly SessionProvider sessions = new(envCtx);
 
-    public async ValueTask<SessionToken> GetOrCreateSession(ISessionToken args, Context ctx)
+    public async ValueTask<SessionToken> GetOrCreateSession(ISessionToken args, CallContext ctx)
     {
         return await sessions.GetOrCreateSession(args, ctx).ConfigureAwait(false);
     }
@@ -35,8 +35,8 @@ internal sealed class ContainerServiceProvider(ContainerService.ContainerService
     internal async IAsyncEnumerable<FrostFsContainerId> ListContainersAsync(PrmContainerGetAll args)
     {
         var ctx = args.Context!;
-        ctx.OwnerId ??= Context.Owner;
+        ctx.OwnerId ??= EnvironmentContext.Owner;
-        ctx.Key ??= Context.Key?.ECDsaKey;
+        ctx.Key ??= EnvironmentContext.Key?.ECDsaKey;
 
         if (ctx.Key == null)
             throw new InvalidObjectException(nameof(ctx.Key));
@@ -147,7 +147,7 @@ internal sealed class ContainerServiceProvider(ContainerService.ContainerService
         Verifier.CheckResponse(response);
     }
 
-    private static GetRequest GetContainerRequest(ContainerID id, NameValueCollection? xHeaders, Context ctx)
+    private static GetRequest GetContainerRequest(ContainerID id, NameValueCollection? xHeaders, CallContext ctx)
     {
         if (ctx.Key == null)
             throw new InvalidObjectException(nameof(ctx.Key));
@@ -172,7 +172,7 @@ internal sealed class ContainerServiceProvider(ContainerService.ContainerService
         Removed
     }
 
-    private async Task WaitForContainer(WaitExpects expect, ContainerID id, PrmWait? waitParams, Context ctx)
+    private async Task WaitForContainer(WaitExpects expect, ContainerID id, PrmWait? waitParams, CallContext ctx)
     {
         var request = GetContainerRequest(id, null, ctx);
 

src/FrostFS.SDK.ClientV2/Services/NetmapServiceProvider.cs

@@ -12,27 +12,33 @@ internal sealed class NetmapServiceProvider : ContextAccessor
 {
     private readonly NetmapService.NetmapServiceClient netmapServiceClient;
 
-    internal NetmapServiceProvider(NetmapService.NetmapServiceClient netmapServiceClient, ClientEnvironment context)
+    internal NetmapServiceProvider(NetmapService.NetmapServiceClient netmapServiceClient, EnvironmentContext context)
         : base(context)
     {
         this.netmapServiceClient = netmapServiceClient;
     }
 
-    internal async Task<NetworkSettings> GetNetworkSettingsAsync(Context ctx)
+    internal async Task<NetworkSettings> GetNetworkSettingsAsync(CallContext ctx)
     {
-        if (Context.NetworkSettings != null)
+        if (EnvironmentContext.NetworkSettings != null)
-            return Context.NetworkSettings;
+            return EnvironmentContext.NetworkSettings;
 
-        var info = await GetNetworkInfoAsync(ctx).ConfigureAwait(false);
+        var response = await GetNetworkInfoAsync(ctx).ConfigureAwait(false);
 
         var settings = new NetworkSettings();
 
-        foreach (var param in info.Body.NetworkInfo.NetworkConfig.Parameters)
+        var info = response.Body.NetworkInfo;
+
+        settings.Epoch = info.CurrentEpoch;
+        settings.MagicNumber = info.MagicNumber;
+        settings.MsPerBlock = info.MsPerBlock;
+
+        foreach (var param in info.NetworkConfig.Parameters)
         {
             SetNetworksParam(param, settings);
         }
 
-        Context.NetworkSettings = settings;
+        EnvironmentContext.NetworkSettings = settings;
 
         return settings;
     }
@@ -40,7 +46,7 @@ internal sealed class NetmapServiceProvider : ContextAccessor
     internal async Task<FrostFsNodeInfo> GetLocalNodeInfoAsync(PrmNodeInfo args)
     {
         var ctx = args.Context!;
-        ctx.Key ??= Context.Key?.ECDsaKey;
+        ctx.Key ??= EnvironmentContext.Key?.ECDsaKey;
 
         if (ctx.Key == null)
             throw new InvalidObjectException(nameof(ctx.Key));
@@ -53,6 +59,8 @@ internal sealed class NetmapServiceProvider : ContextAccessor
         request.AddMetaHeader(args.XHeaders);
         request.Sign(ctx.Key);
 
+
+
         var response = await netmapServiceClient.LocalNodeInfoAsync(request, null, ctx.Deadline, ctx.CancellationToken);
 
         Verifier.CheckResponse(response);
@@ -60,9 +68,9 @@ internal sealed class NetmapServiceProvider : ContextAccessor
         return response.Body.ToModel();
     }
 
-    internal async Task<NetworkInfoResponse> GetNetworkInfoAsync(Context ctx)
+    internal async Task<NetworkInfoResponse> GetNetworkInfoAsync(CallContext ctx)
     {
-        ctx.Key ??= Context.Key?.ECDsaKey;
+        ctx.Key ??= EnvironmentContext.Key?.ECDsaKey;
 
         if (ctx.Key == null)
             throw new InvalidObjectException(nameof(ctx.Key));
@@ -83,7 +91,7 @@ internal sealed class NetmapServiceProvider : ContextAccessor
     internal async Task<FrostFsNetmapSnapshot> GetNetmapSnapshotAsync(PrmNetmapSnapshot args)
     {
         var ctx = args.Context!;
-        ctx.Key ??= Context.Key?.ECDsaKey;
+        ctx.Key ??= EnvironmentContext.Key?.ECDsaKey;
 
         if (ctx.Key == null)
             throw new InvalidObjectException(nameof(ctx.Key));

src/FrostFS.SDK.ClientV2/Services/ObjectServiceProvider.cs

@@ -20,14 +20,14 @@ internal sealed class ObjectServiceProvider : ContextAccessor, ISessionProvider
     private readonly SessionProvider sessions;
     private ObjectService.ObjectServiceClient client;
 
-    internal ObjectServiceProvider(ObjectService.ObjectServiceClient client, ClientEnvironment env)
+    internal ObjectServiceProvider(ObjectService.ObjectServiceClient client, EnvironmentContext env)
         : base(env)
     {
-        this.sessions = new(Context);
+        this.sessions = new(EnvironmentContext);
         this.client = client;
     }
 
-    public async ValueTask<SessionToken> GetOrCreateSession(ISessionToken args, Context ctx)
+    public async ValueTask<SessionToken> GetOrCreateSession(ISessionToken args, CallContext ctx)
     {
         return await sessions.GetOrCreateSession(args, ctx).ConfigureAwait(false);
     }
@@ -35,7 +35,7 @@ internal sealed class ObjectServiceProvider : ContextAccessor, ISessionProvider
     internal async Task<FrostFsObjectHeader> GetObjectHeadAsync(PrmObjectHeadGet args)
     {
         var ctx = args.Context!;
-        ctx.Key ??= Context.Key?.ECDsaKey;
+        ctx.Key ??= EnvironmentContext.Key?.ECDsaKey;
 
         if (ctx.Key == null)
             throw new InvalidObjectException(nameof(ctx.Key));
@@ -74,7 +74,7 @@ internal sealed class ObjectServiceProvider : ContextAccessor, ISessionProvider
     {
         var ctx = args.Context!;
 
-        ctx.Key ??= Context.Key?.ECDsaKey;
+        ctx.Key ??= EnvironmentContext.Key?.ECDsaKey;
 
         if (ctx.Key == null)
             throw new InvalidObjectException(nameof(ctx.Key));
@@ -108,7 +108,7 @@ internal sealed class ObjectServiceProvider : ContextAccessor, ISessionProvider
     internal async Task DeleteObjectAsync(PrmObjectDelete args)
     {
         var ctx = args.Context!;
-        ctx.Key ??= Context.Key?.ECDsaKey;
+        ctx.Key ??= EnvironmentContext.Key?.ECDsaKey;
 
         if (ctx.Key == null)
             throw new InvalidObjectException(nameof(ctx.Key));
@@ -238,7 +238,7 @@ internal sealed class ObjectServiceProvider : ContextAccessor, ISessionProvider
         var ctx = args.Context!;
 
         var tokenRaw = await GetOrCreateSession(args, ctx).ConfigureAwait(false);
-        var token = new FrostFsSessionToken(tokenRaw.Serialize());
+        var token = new FrostFsSessionToken(tokenRaw.Serialize(), tokenRaw.Body.Id.ToUuid());
 
         args.SessionToken = token;
 
@@ -254,7 +254,7 @@ internal sealed class ObjectServiceProvider : ContextAccessor, ISessionProvider
 
         if (args.MaxObjectSizeCache == 0)
         {
-            var networkSettings = await Context.Client.GetNetworkSettingsAsync(new PrmNetworkSettings() { Context = ctx })
+            var networkSettings = await EnvironmentContext.Client.GetNetworkSettingsAsync(new PrmNetworkSettings() { Context = ctx })
                 .ConfigureAwait(false);
 
             args.MaxObjectSizeCache = (int)networkSettings.MaxObjectSize;
@@ -352,7 +352,7 @@ internal sealed class ObjectServiceProvider : ContextAccessor, ISessionProvider
             }
             else
             {
-                chunkBuffer = Context.GetArrayPool(Constants.ObjectChunkSize).Rent(chunkSize);
+                chunkBuffer = EnvironmentContext.GetArrayPool(Constants.ObjectChunkSize).Rent(chunkSize);
                 isRentBuffer = true;
             }
 
@@ -404,7 +404,7 @@ internal sealed class ObjectServiceProvider : ContextAccessor, ISessionProvider
         }
     }
 
-    private async Task<ObjectStreamer> GetUploadStream(PrmObjectPut args, Context ctx)
+    private async Task<ObjectStreamer> GetUploadStream(PrmObjectPut args, CallContext ctx)
     {
         var header = args.Header!;
 
@@ -449,7 +449,7 @@ internal sealed class ObjectServiceProvider : ContextAccessor, ISessionProvider
         return await PutObjectInit(initRequest, ctx).ConfigureAwait(false);
     }
 
-    private async Task<FrostFsObject> GetObject(GetRequest request, Context ctx)
+    private async Task<FrostFsObject> GetObject(GetRequest request, CallContext ctx)
     {
         var reader = GetObjectInit(request, ctx);
 
@@ -461,7 +461,7 @@ internal sealed class ObjectServiceProvider : ContextAccessor, ISessionProvider
         return modelObject;
     }
 
-    private ObjectReader GetObjectInit(GetRequest initRequest, Context ctx)
+    private ObjectReader GetObjectInit(GetRequest initRequest, CallContext ctx)
     {
         if (initRequest is null)
             throw new ArgumentNullException(nameof(initRequest));
@@ -471,7 +471,7 @@ internal sealed class ObjectServiceProvider : ContextAccessor, ISessionProvider
         return new ObjectReader(call);
     }
 
-    private async Task<ObjectStreamer> PutObjectInit(PutRequest initRequest, Context ctx)
+    private async Task<ObjectStreamer> PutObjectInit(PutRequest initRequest, CallContext ctx)
     {
         if (initRequest is null)
         {
@@ -485,7 +485,7 @@ internal sealed class ObjectServiceProvider : ContextAccessor, ISessionProvider
         return new ObjectStreamer(call);
     }
 
-    private async IAsyncEnumerable<ObjectID> SearchObjects(SearchRequest request, Context ctx)
+    private async IAsyncEnumerable<ObjectID> SearchObjects(SearchRequest request, CallContext ctx)
     {
         using var stream = GetSearchReader(request, ctx);
 
@@ -503,7 +503,7 @@ internal sealed class ObjectServiceProvider : ContextAccessor, ISessionProvider
         }
     }
 
-    private SearchReader GetSearchReader(SearchRequest initRequest, Context ctx)
+    private SearchReader GetSearchReader(SearchRequest initRequest, CallContext ctx)
     {
         if (initRequest is null)
         {

src/FrostFS.SDK.ClientV2/Services/SessionServiceProvider.cs

@@ -10,7 +10,7 @@ internal sealed class SessionServiceProvider : ContextAccessor
 {
     private readonly SessionService.SessionServiceClient? _sessionServiceClient;
 
-    internal SessionServiceProvider(SessionService.SessionServiceClient? sessionServiceClient, ClientEnvironment context)
+    internal SessionServiceProvider(SessionService.SessionServiceClient? sessionServiceClient, EnvironmentContext context)
         : base(context)
     {
         _sessionServiceClient = sessionServiceClient;
@@ -20,7 +20,7 @@ internal sealed class SessionServiceProvider : ContextAccessor
     {
         var ctx = args.Context!;
 
-        ctx.OwnerId ??= Context.Owner;
+        ctx.OwnerId ??= EnvironmentContext.Owner;
 
         var request = new CreateRequest
         {
@@ -37,7 +37,7 @@ internal sealed class SessionServiceProvider : ContextAccessor
         return await CreateSession(request, args.Context!).ConfigureAwait(false);
     }
 
-    internal async Task<SessionToken> CreateSession(CreateRequest request, Context ctx)
+    internal async Task<SessionToken> CreateSession(CreateRequest request, CallContext ctx)
     {
         var response = await _sessionServiceClient!.CreateAsync(request, null, ctx.Deadline, ctx.CancellationToken);
 

src/FrostFS.SDK.ClientV2/Services/Shared/ContextAccessor.cs

@@ -1,6 +1,6 @@
 namespace FrostFS.SDK.ClientV2;
 
-internal class ContextAccessor(ClientEnvironment context)
+internal class ContextAccessor(EnvironmentContext context)
 {
-    protected ClientEnvironment Context { get; set; } = context;
+    protected EnvironmentContext EnvironmentContext { get; set; } = context;
 }

src/FrostFS.SDK.ClientV2/Services/Shared/SessionProvider.cs

@@ -4,16 +4,17 @@ namespace FrostFS.SDK.ClientV2;
 
 internal interface ISessionProvider
 {
-    ValueTask<Session.SessionToken> GetOrCreateSession(ISessionToken args, Context ctx);
+    ValueTask<Session.SessionToken> GetOrCreateSession(ISessionToken args, CallContext ctx);
 }
 
-internal sealed class SessionProvider(ClientEnvironment env)
+internal sealed class SessionProvider(EnvironmentContext envCtx)
 {
-    public async ValueTask<Session.SessionToken> GetOrCreateSession(ISessionToken args, Context ctx)
+    // TODO: implement cache for session in the next iteration
+    public async ValueTask<Session.SessionToken> GetOrCreateSession(ISessionToken args, CallContext ctx)
     {
         if (args.SessionToken is null)
         {
-            return await env.Client.CreateSessionInternalAsync(new PrmSessionCreate(uint.MaxValue) { Context = ctx })
+            return await envCtx.Client.CreateSessionInternalAsync(new PrmSessionCreate(uint.MaxValue) { Context = ctx })
                 .ConfigureAwait(false);
         }
 

src/FrostFS.SDK.ClientV2/Tools/EnvironmentContext.cs

@@ -6,7 +6,7 @@ using Grpc.Net.Client;
 
 namespace FrostFS.SDK.ClientV2;
 
-public class ClientEnvironment(FrostFSClient client, ECDsa? key, FrostFsOwner? owner, GrpcChannel channel, FrostFsVersion version) : IDisposable
+public class EnvironmentContext(FrostFSClient client, ECDsa? key, FrostFsOwner? owner, GrpcChannel channel, FrostFsVersion version) : IDisposable
 {
     private ArrayPool<byte>? _arrayPool;
 

src/FrostFS.SDK.ClientV2/Tools/NetworkSettings.cs

@@ -4,6 +4,10 @@ namespace FrostFS.SDK.ClientV2;
 
 public class NetworkSettings
 {
+    public ulong Epoch { get; internal set; }
+    public ulong MagicNumber { get; internal set; }
+    public long MsPerBlock { get; internal set; }
+
     public ulong AuditFee { get; internal set; }
     public ulong BasicIncomeRate { get; internal set; }
     public ulong ContainerFee { get; internal set; }

src/FrostFS.SDK.ClientV2/Tools/ObjectTools.cs

@@ -11,7 +11,7 @@ namespace FrostFS.SDK.ClientV2;
 
 internal static class ObjectTools
 {
-    internal static FrostFsObjectId CalculateObjectId(FrostFsObjectHeader header, Context ctx)
+    internal static FrostFsObjectId CalculateObjectId(FrostFsObjectHeader header, CallContext ctx)
     {
         var grpcHeader = CreateHeader(header, [], ctx);
 
@@ -21,7 +21,7 @@ internal static class ObjectTools
         return new ObjectID { Value = grpcHeader.Sha256() }.ToModel();
     }
 
-    internal static Object.Object CreateObject(FrostFsObject @object, Context ctx)
+    internal static Object.Object CreateObject(FrostFsObject @object, CallContext ctx)
     {
         @object.Header.OwnerId ??= ctx.OwnerId;
         @object.Header.Version ??= ctx.Version;
@@ -53,7 +53,7 @@ internal static class ObjectTools
         return obj;
     }
 
-    internal static void SetSplitValues(Header grpcHeader, FrostFsSplit split, Context ctx)
+    internal static void SetSplitValues(Header grpcHeader, FrostFsSplit split, CallContext ctx)
     {
         if (split == null)
             return;
@@ -85,7 +85,7 @@ internal static class ObjectTools
         grpcHeader.Split.Previous = split.Previous?.ToMessage();
     }
 
-    internal static Header CreateHeader(FrostFsObjectHeader header, byte[]? payload, Context ctx)
+    internal static Header CreateHeader(FrostFsObjectHeader header, byte[]? payload, CallContext ctx)
     {
         header.OwnerId ??= ctx.OwnerId;
         header.Version ??= ctx.Version;

src/FrostFS.SDK.ClientV2/Tools/RequestSigner.cs

@@ -76,6 +76,11 @@ public static class RequestSigner
 
     public static byte[] SignData(this ECDsa key, byte[] data)
     {
+        if (key is null)
+        {
+            throw new ArgumentNullException(nameof(key));
+        }
+
         var hash = new byte[65];
         hash[0] = 0x04;
 

src/FrostFS.SDK.ProtosV2/accounting/Extension.Message.cs

@@ -0,0 +1,62 @@
+using FrostFS.SDK.ProtosV2.Interfaces;
+using FrostFS.Session;
+
+using Google.Protobuf;
+
+namespace FrostFS.Accounting;
+
+public partial class BalanceRequest : IRequest
+{
+    IMetaHeader IVerifiableMessage.GetMetaHeader()
+    {
+        return MetaHeader;
+    }
+
+    IVerificationHeader IVerifiableMessage.GetVerificationHeader()
+    {
+        return VerifyHeader;
+    }
+
+    void IVerifiableMessage.SetMetaHeader(IMetaHeader metaHeader)
+    {
+        MetaHeader = (RequestMetaHeader)metaHeader;
+    }
+
+    void IVerifiableMessage.SetVerificationHeader(IVerificationHeader verificationHeader)
+    {
+        VerifyHeader = (RequestVerificationHeader)verificationHeader;
+    }
+
+    public IMessage GetBody()
+    {
+        return Body;
+    }
+}
+
+public partial class BalanceResponse : IResponse
+{
+    IMetaHeader IVerifiableMessage.GetMetaHeader()
+    {
+        return MetaHeader;
+    }
+
+    IVerificationHeader IVerifiableMessage.GetVerificationHeader()
+    {
+        return VerifyHeader;
+    }
+
+    void IVerifiableMessage.SetMetaHeader(IMetaHeader metaHeader)
+    {
+        MetaHeader = (ResponseMetaHeader)metaHeader;
+    }
+
+    void IVerifiableMessage.SetVerificationHeader(IVerificationHeader verificationHeader)
+    {
+        VerifyHeader = (ResponseVerificationHeader)verificationHeader;
+    }
+
+    public IMessage GetBody()
+    {
+        return Body;
+    }
+}

src/FrostFS.SDK.Tests/ContainerTest.cs

@@ -1,49 +1,14 @@
+using System.Diagnostics.CodeAnalysis;
+
 using FrostFS.SDK.ClientV2;
-using FrostFS.SDK.ClientV2.Interfaces;
 using FrostFS.SDK.ClientV2.Mappers.GRPC;
 using FrostFS.SDK.Cryptography;
 
 using Google.Protobuf;
 
-using Microsoft.Extensions.Options;
-
 namespace FrostFS.SDK.Tests;
 
-public abstract class ContainerTestsBase
+[SuppressMessage("Reliability", "CA2007:Consider calling ConfigureAwait on the awaited task", Justification = "Default Value is correct for tests")]
-{
-    protected readonly string key = "KwHDAJ66o8FoLBjVbjP2sWBmgBMGjt7Vv4boA7xQrBoAYBE397Aq";
-
-    protected IOptions<SingleOwnerClientSettings> Settings { get; set; }
-    protected ContainerMocker Mocker { get; set; }
-
-    protected ContainerTestsBase()
-    {
-        Settings = Options.Create(new SingleOwnerClientSettings
-        {
-            Key = key,
-            Host = "http://localhost:8080"
-        });
-
-        Mocker = new ContainerMocker(this.key)
-        {
-            PlacementPolicy = new FrostFsPlacementPolicy(true, new FrostFsReplica(1)),
-            Version = new FrostFsVersion(2, 13),
-            ContainerGuid = Guid.NewGuid()
-        };
-    }
-
-    protected IFrostFSClient GetClient()
-    {
-        return ClientV2.FrostFSClient.GetTestInstance(
-            Settings,
-            null,
-            new NetworkMocker(this.key).GetMock().Object,
-            new SessionMocker(this.key).GetMock().Object,
-            Mocker.GetMock().Object,
-            new ObjectMocker(this.key).GetMock().Object);
-    }
-}
-
 public class ContainerTest : ContainerTestsBase
 {
     [Fact]

src/FrostFS.SDK.Tests/ContainerTestsBase.cs

@@ -0,0 +1,40 @@
+using FrostFS.SDK.ClientV2.Interfaces;
+
+using Microsoft.Extensions.Options;
+
+namespace FrostFS.SDK.Tests;
+
+public abstract class ContainerTestsBase
+{
+    internal readonly string key = "KwHDAJ66o8FoLBjVbjP2sWBmgBMGjt7Vv4boA7xQrBoAYBE397Aq";
+
+    protected IOptions<SingleOwnerClientSettings> Settings { get; set; }
+    protected ContainerMocker Mocker { get; set; }
+
+    protected ContainerTestsBase()
+    {
+        Settings = Options.Create(new SingleOwnerClientSettings
+        {
+            Key = key,
+            Host = "http://localhost:8080"
+        });
+
+        Mocker = new ContainerMocker(this.key)
+        {
+            PlacementPolicy = new FrostFsPlacementPolicy(true, new FrostFsReplica(1)),
+            Version = new FrostFsVersion(2, 13),
+            ContainerGuid = Guid.NewGuid()
+        };
+    }
+
+    protected IFrostFSClient GetClient()
+    {
+        return ClientV2.FrostFSClient.GetTestInstance(
+            Settings,
+            null,
+            new NetworkMocker(this.key).GetMock().Object,
+            new SessionMocker(this.key).GetMock().Object,
+            Mocker.GetMock().Object,
+            new ObjectMocker(this.key).GetMock().Object);
+    }
+}

src/FrostFS.SDK.Tests/GlobalSuppressions.cs

@@ -0,0 +1,6 @@
+// This file is used by Code Analysis to maintain SuppressMessage
+// attributes that are applied to this project.
+// Project-level suppressions either have no target or are given
+// a specific target and scoped to a namespace, type, member, etc.
+
+

src/FrostFS.SDK.Tests/MetricsInterceptor.cs

@@ -12,7 +12,9 @@ public class MetricsInterceptor() : Interceptor
         ClientInterceptorContext<TRequest, TResponse> context,
         AsyncUnaryCallContinuation<TRequest, TResponse> continuation)
     {
-        var call = continuation(request, context);
+        ArgumentNullException.ThrowIfNull(continuation);
+
+        using var call = continuation(request, context);
 
         return new AsyncUnaryCall<TResponse>(
             HandleUnaryResponse(call),
@@ -27,7 +29,7 @@ public class MetricsInterceptor() : Interceptor
         var watch = new Stopwatch();
         watch.Start();
 
-        var response = await call.ResponseAsync;
+        var response = await call.ResponseAsync.ConfigureAwait(false);
 
         watch.Stop();
 

src/FrostFS.SDK.Tests/Mocks/AsyncStreamReaderMock.cs

@@ -26,8 +26,11 @@ public class AsyncStreamReaderMock(string key, FrostFsObjectHeader objectHeader)
                 OwnerId = objectHeader.OwnerId!.ToMessage()
             };
 
+            if (objectHeader.Attributes != null)
+            {
                 foreach (var attr in objectHeader.Attributes)
                     header.Attributes.Add(attr.ToMessage());
+            }
 
             var response = new GetResponse
             {

src/FrostFS.SDK.Tests/Mocks/ClientStreamWriter.cs

@@ -1,3 +1,5 @@
+using System.Collections.ObjectModel;
+
 using FrostFS.SDK.ProtosV2.Interfaces;
 
 using Grpc.Core;
@@ -6,13 +8,15 @@ namespace FrostFS.SDK.Tests;
 
 public class ClientStreamWriter : IClientStreamWriter<IRequest>
 {
-    public List<IRequest> Messages { get; set; } = [];
+    private WriteOptions? _options;
+
+    public Collection<IRequest> Messages { get; } = [];
     public bool CompletedTask { get; private set; }
 
     public WriteOptions? WriteOptions
     {
-        get => throw new NotImplementedException();
+        get => _options;
-        set => throw new NotImplementedException();
+        set => _options = value;
     }
 
     public Task CompleteAsync()

src/FrostFS.SDK.Tests/Mocks/ContainerServiceMocks/ContainerServiceBase.cs

@@ -25,7 +25,10 @@ public abstract class ServiceBase(string key)
     public static FrostFsVersion DefaultVersion { get; } = new(2, 13);
     public static FrostFsPlacementPolicy DefaultPlacementPolicy { get; } = new FrostFsPlacementPolicy(true, new FrostFsReplica(1));
 
-    public Metadata Metadata { get; protected set; }
+#pragma warning disable CA2227 // this is specific object, should be treated as is
+    public Metadata? Metadata { get; set; }
+#pragma warning restore CA2227 
+
     public DateTime? DateTime { get; protected set; }
 
     public CancellationToken CancellationToken { get; protected set; }
@@ -35,6 +38,8 @@ public abstract class ServiceBase(string key)
 
     protected ResponseVerificationHeader GetResponseVerificationHeader(IResponse response)
     {
+        ArgumentNullException.ThrowIfNull(response);
+
         var verifyHeader = new ResponseVerificationHeader
         {
             MetaSignature = new Refs.Signature

src/FrostFS.SDK.Tests/Mocks/ContainerServiceMocks/GetContainerMock.cs

@@ -1,3 +1,5 @@
+using System.Collections.ObjectModel;
+
 using FrostFS.Container;
 using FrostFS.Refs;
 using FrostFS.SDK.ClientV2;
@@ -41,7 +43,7 @@ public class ContainerMocker(string key) : ContainerServiceBase(key)
         putResponse.VerifyHeader = GetResponseVerificationHeader(putResponse);
 
         var metadata = new Metadata();
-        var putContainerResponse = new AsyncUnaryCall<PutResponse>(
+        using var putContainerResponse = new AsyncUnaryCall<PutResponse>(
                     Task.FromResult(putResponse),
                     Task.FromResult(metadata),
                     () => new Grpc.Core.Status(StatusCode.OK, string.Empty),
@@ -180,7 +182,7 @@ public class ContainerMocker(string key) : ContainerServiceBase(key)
 
     public bool ReturnContainerRemoved { get; set; }
 
-    public List<byte[]> ContainerIds { get; set; } = [];
+    public Collection<byte[]> ContainerIds { get; } = [];
 
-    public List<RequestData<DeleteRequest>> Requests { get; set; } = [];
+    public Collection<RequestData<DeleteRequest>> Requests { get; } = [];
 }

src/FrostFS.SDK.Tests/Mocks/NetworkMocker.cs

@@ -25,18 +25,17 @@ public class NetworkMocker(string key) : ServiceBase(key)
         "MaintenanceModeAllowed"
     ];
 
-    public Dictionary<string, byte[]>? Parameters { get; set; }
+    public Dictionary<string, byte[]> Parameters { get; } = [];
 
-    public LocalNodeInfoResponse NodeInfoResponse { get; set; }
+    public LocalNodeInfoResponse? NodeInfoResponse { get; set; }
 
-    public LocalNodeInfoRequest LocalNodeInfoRequest { get; set; }
+    public LocalNodeInfoRequest? LocalNodeInfoRequest { get; set; }
 
-    public NetworkInfoRequest NetworkInfoRequest { get; set; }
+    public NetworkInfoRequest? NetworkInfoRequest { get; set; }
 
-    public NetmapSnapshotResponse NetmapSnapshotResponse { get; set; }
+    public NetmapSnapshotResponse? NetmapSnapshotResponse { get; set; }
-
-    public NetmapSnapshotRequest NetmapSnapshotRequest { get; set; }
 
+    public NetmapSnapshotRequest? NetmapSnapshotRequest { get; set; }
 
     public Mock<NetmapService.NetmapServiceClient> GetMock()
     {

src/FrostFS.SDK.Tests/Mocks/ObjectMock.cs

@@ -1,3 +1,4 @@
+using System.Collections.ObjectModel;
 using System.Security.Cryptography;
 
 using FrostFS.Object;
@@ -92,7 +93,7 @@ public class ObjectMocker(string key) : ObjectServiceBase(key)
 
         }
 
-        if (ResultObjectIds != null)
+        if (ResultObjectIds != null && ResultObjectIds.Count > 0)
         {
             PutResponse putResponse = new()
             {
@@ -197,14 +198,14 @@ public class ObjectMocker(string key) : ObjectServiceBase(key)
 
     public Header? HeadResponse { get; set; }
 
-    public List<byte[]>? ResultObjectIds { get; set; }
+    public Collection<byte[]>? ResultObjectIds { get; } = [];
 
     public ClientStreamWriter? ClientStreamWriter { get; private set; } = new();
 
-    public List<PutSingleRequest> PutSingleRequests { get; private set; } = [];
+    public Collection<PutSingleRequest> PutSingleRequests { get; private set; } = [];
 
-    public List<DeleteRequest> DeleteRequests { get; private set; } = [];
+    public Collection<DeleteRequest> DeleteRequests { get; private set; } = [];
 
-    public List<HeadRequest> HeadRequests { get; private set; } = [];
+    public Collection<HeadRequest> HeadRequests { get; private set; } = [];
 }
 

src/FrostFS.SDK.Tests/Mocks/SessionMock.cs

@@ -8,13 +8,14 @@ using Moq;
 
 namespace FrostFS.SDK.Tests;
 
+[System.Diagnostics.CodeAnalysis.SuppressMessage("Security", "CA5394:Do not use insecure randomness", Justification = "No secure purpose")]
 public class SessionMocker(string key) : ServiceBase(key)
 {
     public byte[]? SessionId { get; set; }
 
     public byte[]? SessionKey { get; set; }
 
-    public CreateRequest CreateSessionRequest { get; private set; }
+    public CreateRequest? CreateSessionRequest { get; private set; }
 
     public Mock<SessionService.SessionServiceClient> GetMock()
     {
@@ -24,7 +25,7 @@ public class SessionMocker(string key) : ServiceBase(key)
 
         if (SessionId == null)
         {
-            SessionId = new byte[32];
+            SessionId = new byte[16];
             rand.NextBytes(SessionId);
         }
 

src/FrostFS.SDK.Tests/NetworkTest.cs

@@ -1,55 +1,13 @@
-using System.Security.Cryptography;
+using System.Diagnostics.CodeAnalysis;
 
 using FrostFS.Netmap;
 using FrostFS.SDK.ClientV2;
-using FrostFS.SDK.ClientV2.Interfaces;
-using FrostFS.SDK.ClientV2;
-using FrostFS.SDK.Cryptography;
 
 using Google.Protobuf;
 
-using Microsoft.Extensions.Options;
-
 namespace FrostFS.SDK.Tests;
 
-public abstract class NetworkTestsBase
+[SuppressMessage("Reliability", "CA2007:Consider calling ConfigureAwait on the awaited task", Justification = "Default Value is correct for tests")]
-{
-    protected readonly string key = "KwHDAJ66o8FoLBjVbjP2sWBmgBMGjt7Vv4boA7xQrBoAYBE397Aq";
-
-    protected IOptions<SingleOwnerClientSettings> Settings { get; set; }
-
-    protected FrostFsVersion Version { get; set; } = new FrostFsVersion(2, 13);
-
-    protected ECDsa ECDsaKey { get; set; }
-    protected FrostFsOwner OwnerId { get; set; }
-    protected NetworkMocker Mocker { get; set; }
-
-    protected NetworkTestsBase()
-    {
-        Settings = Options.Create(new SingleOwnerClientSettings
-        {
-            Key = key,
-            Host = "http://localhost:8080"
-        });
-
-        ECDsaKey = key.LoadWif();
-        OwnerId = FrostFsOwner.FromKey(ECDsaKey);
-
-        Mocker = new NetworkMocker(this.key);
-    }
-
-    protected IFrostFSClient GetClient()
-    {
-        return ClientV2.FrostFSClient.GetTestInstance(
-            Settings,
-            null,
-            Mocker.GetMock().Object,
-            new SessionMocker(this.key).GetMock().Object,
-            new ContainerMocker(this.key).GetMock().Object,
-            new ObjectMocker(this.key).GetMock().Object);
-    }
-}
-
 public class NetworkTest : NetworkTestsBase
 {
     [Theory]
@@ -57,27 +15,24 @@ public class NetworkTest : NetworkTestsBase
     [InlineData(true)]
     public async void NetworkSettingsTest(bool useContext)
     {
-        Mocker.Parameters = new Dictionary<string, byte[]>
+        Mocker.Parameters.Add("AuditFee", [1]);
-        {
+        Mocker.Parameters.Add("BasicIncomeRate", [2]);
-            { "AuditFee", [1] },
+        Mocker.Parameters.Add("ContainerFee", [3]);
-            { "BasicIncomeRate", [2] },
+        Mocker.Parameters.Add("ContainerAliasFee", [4]);
-            { "ContainerFee", [3] },
+        Mocker.Parameters.Add("EpochDuration", [5]);
-            { "ContainerAliasFee", [4] },
+        Mocker.Parameters.Add("InnerRingCandidateFee", [6]);
-            { "EpochDuration", [5] },
+        Mocker.Parameters.Add("MaxECDataCount", [7]);
-            { "InnerRingCandidateFee", [6] },
+        Mocker.Parameters.Add("MaxECParityCount", [8]);
-            { "MaxECDataCount", [7] },
+        Mocker.Parameters.Add("MaxObjectSize", [9]);
-            { "MaxECParityCount", [8] },
+        Mocker.Parameters.Add("WithdrawFee", [10]);
-            { "MaxObjectSize", [9] },
+        Mocker.Parameters.Add("HomomorphicHashingDisabled", [1]);
-            { "WithdrawFee", [10] },
+        Mocker.Parameters.Add("MaintenanceModeAllowed", [1]);
-            { "HomomorphicHashingDisabled", [1] },
-            { "MaintenanceModeAllowed", [1] },
-        };
 
         var param = new PrmNetworkSettings();
 
         if (useContext)
         {
-            param.Context = new Context
+            param.Context = new CallContext
             {
                 CancellationToken = Mocker.CancellationTokenSource.Token,
                 Timeout = TimeSpan.FromSeconds(20),
@@ -119,6 +74,7 @@ public class NetworkTest : NetworkTestsBase
         }
         else
         {
+            Assert.NotNull(Mocker.NetworkInfoRequest);
             Assert.Empty(Mocker.NetworkInfoRequest.MetaHeader.XHeaders);
             Assert.Null(Mocker.DateTime);
         }
@@ -127,6 +83,7 @@ public class NetworkTest : NetworkTestsBase
     [Theory]
     [InlineData(false)]
     [InlineData(true)]
+
     public async void NetmapSnapshotTest(bool useContext)
     {
         var body = new NetmapSnapshotResponse.Types.Body
@@ -164,7 +121,7 @@ public class NetworkTest : NetworkTestsBase
         if (useContext)
         {
             param.XHeaders.Add("headerKey1", "headerValue1");
-            param.Context = new Context
+            param.Context = new CallContext
             {
                 CancellationToken = Mocker.CancellationTokenSource.Token,
                 Timeout = TimeSpan.FromSeconds(20),
@@ -210,6 +167,7 @@ public class NetworkTest : NetworkTestsBase
 
         if (useContext)
         {
+            Assert.NotNull(Mocker.NetmapSnapshotRequest);
             Assert.Single(Mocker.NetmapSnapshotRequest.MetaHeader.XHeaders);
             Assert.Equal(param.XHeaders.Keys[0], Mocker.NetmapSnapshotRequest.MetaHeader.XHeaders.First().Key);
             Assert.Equal(param.XHeaders[param.XHeaders.Keys[0]], Mocker.NetmapSnapshotRequest.MetaHeader.XHeaders.First().Value);
@@ -222,6 +180,7 @@ public class NetworkTest : NetworkTestsBase
         }
         else
         {
+            Assert.NotNull(Mocker.NetmapSnapshotRequest);
             Assert.Empty(Mocker.NetmapSnapshotRequest.MetaHeader.XHeaders);
             Assert.Null(Mocker.DateTime);
         }
@@ -254,7 +213,7 @@ public class NetworkTest : NetworkTestsBase
         if (useContext)
         {
             param.XHeaders.Add("headerKey1", "headerValue1");
-            param.Context = new Context
+            param.Context = new CallContext
             {
                 CancellationToken = Mocker.CancellationTokenSource.Token,
                 Timeout = TimeSpan.FromSeconds(20),
@@ -282,6 +241,7 @@ public class NetworkTest : NetworkTestsBase
         Assert.Equal("value1", result.Attributes["key1"]);
         Assert.Equal("value2", result.Attributes["key2"]);
 
+        Assert.NotNull(Mocker.LocalNodeInfoRequest);
         if (useContext)
         {
             Assert.Single(Mocker.LocalNodeInfoRequest.MetaHeader.XHeaders);

src/FrostFS.SDK.Tests/NetworkTestsBase.cs

@@ -0,0 +1,48 @@
+using System.Diagnostics.CodeAnalysis;
+using System.Security.Cryptography;
+
+using FrostFS.SDK.ClientV2.Interfaces;
+using FrostFS.SDK.Cryptography;
+
+using Microsoft.Extensions.Options;
+
+namespace FrostFS.SDK.Tests;
+
+[SuppressMessage("Reliability", "CA2007:Consider calling ConfigureAwait on the awaited task", Justification = "Default Value is correct for tests")]
+public abstract class NetworkTestsBase
+{
+    internal readonly string key = "KwHDAJ66o8FoLBjVbjP2sWBmgBMGjt7Vv4boA7xQrBoAYBE397Aq";
+
+    protected IOptions<SingleOwnerClientSettings> Settings { get; set; }
+
+    protected FrostFsVersion Version { get; set; } = new FrostFsVersion(2, 13);
+
+    protected ECDsa ECDsaKey { get; set; }
+    protected FrostFsOwner OwnerId { get; set; }
+    protected NetworkMocker Mocker { get; set; }
+
+    protected NetworkTestsBase()
+    {
+        Settings = Options.Create(new SingleOwnerClientSettings
+        {
+            Key = key,
+            Host = "http://localhost:8080"
+        });
+
+        ECDsaKey = key.LoadWif();
+        OwnerId = FrostFsOwner.FromKey(ECDsaKey);
+
+        Mocker = new NetworkMocker(this.key);
+    }
+
+    protected IFrostFSClient GetClient()
+    {
+        return ClientV2.FrostFSClient.GetTestInstance(
+            Settings,
+            null,
+            Mocker.GetMock().Object,
+            new SessionMocker(this.key).GetMock().Object,
+            new ContainerMocker(this.key).GetMock().Object,
+            new ObjectMocker(this.key).GetMock().Object);
+    }
+}

src/FrostFS.SDK.Tests/ObjectTest.cs

@@ -1,71 +1,19 @@
+using System.Collections.ObjectModel;
+using System.Diagnostics.CodeAnalysis;
 using System.Security.Cryptography;
 using System.Text;
 
 using FrostFS.Refs;
 using FrostFS.SDK.ClientV2;
-using FrostFS.SDK.ClientV2.Interfaces;
 using FrostFS.SDK.ClientV2.Mappers.GRPC;
-using FrostFS.SDK.ClientV2;
 using FrostFS.SDK.Cryptography;
 
 using Google.Protobuf;
 
-using Microsoft.Extensions.Options;
-
 namespace FrostFS.SDK.Tests;
 
-public abstract class ObjectTestsBase
+[SuppressMessage("Reliability", "CA2007:Consider calling ConfigureAwait on the awaited task", Justification = "Default Value is correct for tests")]
-{
+[SuppressMessage("Security", "CA5394:Do not use insecure randomness", Justification = "No secure purpose")]
-    protected static readonly string key = "KwHDAJ66o8FoLBjVbjP2sWBmgBMGjt7Vv4boA7xQrBoAYBE397Aq";
-
-    protected IOptions<SingleOwnerClientSettings> Settings { get; set; }
-    protected FrostFsContainerId ContainerId { get; set; }
-
-    protected NetworkMocker NetworkMocker { get; set; } = new NetworkMocker(key);
-    protected SessionMocker SessionMocker { get; set; } = new SessionMocker(key);
-    protected ContainerMocker ContainerMocker { get; set; } = new ContainerMocker(key);
-    protected ObjectMocker Mocker { get; set; }
-
-    protected ObjectTestsBase()
-    {
-        var ecdsaKey = key.LoadWif();
-
-        Settings = Options.Create(new SingleOwnerClientSettings
-        {
-            Key = key,
-            Host = "http://localhost:8080"
-        });
-
-        Mocker = new ObjectMocker(key)
-        {
-            PlacementPolicy = new FrostFsPlacementPolicy(true, new FrostFsReplica(1)),
-            Version = new FrostFsVersion(2, 13),
-            ContainerGuid = Guid.NewGuid()
-        };
-
-        ContainerId = new FrostFsContainerId(Base58.Encode(Mocker.ContainerGuid.ToBytes()));
-
-        Mocker.ObjectHeader = new(
-            ContainerId,
-            FrostFsObjectType.Regular,
-            [new FrostFsAttributePair("k", "v")],
-            null,
-            FrostFsOwner.FromKey(ecdsaKey),
-            new FrostFsVersion(2, 13));
-    }
-
-    protected IFrostFSClient GetClient()
-    {
-        return FrostFSClient.GetTestInstance(
-            Settings,
-            null,
-            NetworkMocker.GetMock().Object,
-            SessionMocker.GetMock().Object,
-            ContainerMocker.GetMock().Object,
-            Mocker.GetMock().Object);
-    }
-}
-
 public class ObjectTest : ObjectTestsBase
 {
     [Fact]
@@ -75,7 +23,7 @@ public class ObjectTest : ObjectTestsBase
 
         var ecdsaKey = key.LoadWif();
 
-        var ctx = new Context
+        var ctx = new CallContext
         {
             Key = ecdsaKey,
             OwnerId = FrostFsOwner.FromKey(ecdsaKey),
@@ -88,18 +36,21 @@ public class ObjectTest : ObjectTestsBase
 
         Assert.NotNull(result);
 
-        Assert.Equal(Mocker.ObjectHeader!.ContainerId.GetValue(), result.Header.ContainerId.GetValue());
+        Assert.NotNull(Mocker.ObjectHeader);
-        Assert.Equal(Mocker.ObjectHeader!.OwnerId!.Value, result.Header.OwnerId!.Value);
+
+        Assert.Equal(Mocker.ObjectHeader.ContainerId.GetValue(), result.Header.ContainerId.GetValue());
+        Assert.Equal(Mocker.ObjectHeader.OwnerId!.Value, result.Header.OwnerId!.Value);
         Assert.Equal(Mocker.ObjectHeader.PayloadLength, result.Header.PayloadLength);
+        Assert.NotNull(result.Header.Attributes);
         Assert.Single(result.Header.Attributes);
-        Assert.Equal(Mocker.ObjectHeader.Attributes[0].Key, result.Header.Attributes[0].Key);
+        Assert.Equal(Mocker.ObjectHeader.Attributes![0].Key, result.Header.Attributes[0].Key);
-        Assert.Equal(Mocker.ObjectHeader.Attributes[0].Value, result.Header.Attributes[0].Value);
+        Assert.Equal(Mocker.ObjectHeader.Attributes![0].Value, result.Header.Attributes[0].Value);
     }
 
     [Fact]
     public async void PutObjectTest()
     {
-        Mocker.ResultObjectIds = new([SHA256.HashData([])]);
+        Mocker.ResultObjectIds.Add(SHA256.HashData([]));
 
         Random rnd = new();
         var bytes = new byte[1024];
@@ -134,7 +85,7 @@ public class ObjectTest : ObjectTestsBase
     [Fact]
     public async void ClientCutTest()
     {
-        NetworkMocker.Parameters = new Dictionary<string, byte[]>() { { "MaxObjectSize", [0x0, 0xa] } };
+        NetworkMocker.Parameters.Add("MaxObjectSize", [0x0, 0xa]);
 
         var blockSize = 2560;
         byte[] bytes = File.ReadAllBytes(@".\..\..\..\TestData\cat.jpg");
@@ -150,17 +101,19 @@ public class ObjectTest : ObjectTestsBase
 
         Random rnd = new();
 
-        List<byte[]> objIds = new([new byte[32], new byte[32], new byte[32]]);
+        Collection<byte[]> objIds = new([new byte[32], new byte[32], new byte[32]]);
         rnd.NextBytes(objIds.ElementAt(0));
         rnd.NextBytes(objIds.ElementAt(1));
         rnd.NextBytes(objIds.ElementAt(2));
 
-        Mocker.ResultObjectIds = objIds;
+        foreach (var objId in objIds)
+            Mocker.ResultObjectIds.Add(objId);
 
         var result = await GetClient().PutObjectAsync(param);
 
         var singleObjects = Mocker.PutSingleRequests.ToArray();
 
+        Assert.NotNull(Mocker.ClientStreamWriter?.Messages);
         var streamObjects = Mocker.ClientStreamWriter.Messages.ToArray();
 
         Assert.Single(singleObjects);
@@ -262,6 +215,7 @@ public class ObjectTest : ObjectTestsBase
 
         Assert.Equal(FrostFsObjectType.Regular, response.ObjectType);
 
+        Assert.NotNull(response.Attributes);
         Assert.Single(response.Attributes);
 
         Assert.Equal(Mocker.HeadResponse.Attributes[0].Key, response.Attributes.First().Key);

src/FrostFS.SDK.Tests/ObjectTestsBase.cs

@@ -0,0 +1,59 @@
+using FrostFS.SDK.ClientV2;
+using FrostFS.SDK.ClientV2.Interfaces;
+using FrostFS.SDK.Cryptography;
+
+using Microsoft.Extensions.Options;
+
+namespace FrostFS.SDK.Tests;
+
+public abstract class ObjectTestsBase
+{
+    protected static readonly string key = "KwHDAJ66o8FoLBjVbjP2sWBmgBMGjt7Vv4boA7xQrBoAYBE397Aq";
+
+    protected IOptions<SingleOwnerClientSettings> Settings { get; set; }
+    protected FrostFsContainerId ContainerId { get; set; }
+
+    protected NetworkMocker NetworkMocker { get; set; } = new NetworkMocker(key);
+    protected SessionMocker SessionMocker { get; set; } = new SessionMocker(key);
+    protected ContainerMocker ContainerMocker { get; set; } = new ContainerMocker(key);
+    protected ObjectMocker Mocker { get; set; }
+
+    protected ObjectTestsBase()
+    {
+        var ecdsaKey = key.LoadWif();
+
+        Settings = Options.Create(new SingleOwnerClientSettings
+        {
+            Key = key,
+            Host = "http://localhost:8080"
+        });
+
+        Mocker = new ObjectMocker(key)
+        {
+            PlacementPolicy = new FrostFsPlacementPolicy(true, new FrostFsReplica(1)),
+            Version = new FrostFsVersion(2, 13),
+            ContainerGuid = Guid.NewGuid()
+        };
+
+        ContainerId = new FrostFsContainerId(Base58.Encode(Mocker.ContainerGuid.ToBytes()));
+
+        Mocker.ObjectHeader = new(
+            ContainerId,
+            FrostFsObjectType.Regular,
+            [new FrostFsAttributePair("k", "v")],
+            null,
+            FrostFsOwner.FromKey(ecdsaKey),
+            new FrostFsVersion(2, 13));
+    }
+
+    protected IFrostFSClient GetClient()
+    {
+        return FrostFSClient.GetTestInstance(
+            Settings,
+            null,
+            NetworkMocker.GetMock().Object,
+            SessionMocker.GetMock().Object,
+            ContainerMocker.GetMock().Object,
+            Mocker.GetMock().Object);
+    }
+}

src/FrostFS.SDK.Tests/PoolSmokeTests.cs

@@ -0,0 +1,603 @@
+using System.Diagnostics.CodeAnalysis;
+using System.Security.Cryptography;
+
+using FrostFS.SDK.ClientV2;
+using FrostFS.SDK.Cryptography;
+
+using Microsoft.Extensions.Options;
+
+using static FrostFS.Session.SessionToken.Types.Body;
+
+namespace FrostFS.SDK.SmokeTests;
+
+[SuppressMessage("Reliability", "CA2007:Consider calling ConfigureAwait on the awaited task", Justification = "Default Value is correct for tests")]
+[SuppressMessage("Security", "CA5394:Do not use insecure randomness", Justification = "No secure purpose")]
+public class PoolSmokeTests : SmokeTestsBase
+{
+    private static readonly PrmWait lightWait = new(100, 1);
+
+    private InitParameters GetDefaultParams()
+    {
+        return new InitParameters
+        {
+            Key = keyString.LoadWif(),
+
+            NodeParams = [new(1, this.url, 100.0f)],
+            DialOptions = [new()
+                {
+                Authority = "",
+                Block = false,
+                DisableHealthCheck = false,
+                DisableRetry = false,
+                ReturnLastError = true,
+                Timeout = 30_000_000
+                }
+           ],
+            ClientBuilder = null,
+            GracefulCloseOnSwitchTimeout = 30_000_000,
+            Logger = null
+        };
+    }
+
+    [Fact]
+    public async void NetworkMapTest()
+    {
+        var options = GetDefaultParams();
+
+        using var pool = new Pool(options);
+
+        var error = await pool.Dial(new CallContext());
+
+        Assert.Null(error);
+
+        var result = await pool.GetNetmapSnapshotAsync(default);
+
+        Assert.True(result.Epoch > 0);
+        Assert.Single(result.NodeInfoCollection);
+
+        var item = result.NodeInfoCollection[0];
+        Assert.Equal(2, item.Version.Major);
+        Assert.Equal(13, item.Version.Minor);
+        Assert.Equal(NodeState.Online, item.State);
+        Assert.True(item.PublicKey.Length > 0);
+        Assert.Single(item.Addresses);
+        Assert.Equal(9, item.Attributes.Count);
+    }
+
+    [Fact]
+    public async void NodeInfoTest()
+    {
+        var options = GetDefaultParams();
+
+        using var pool = new Pool(options);
+
+        var error = await pool.Dial(new CallContext());
+
+        Assert.Null(error);
+
+        var result = await pool.GetNodeInfoAsync();
+
+        Assert.Equal(2, result.Version.Major);
+        Assert.Equal(13, result.Version.Minor);
+        Assert.Equal(NodeState.Online, result.State);
+        Assert.Equal(33, result.PublicKey.Length);
+        Assert.Single(result.Addresses);
+        Assert.Equal(9, result.Attributes.Count);
+    }
+
+    [Fact]
+    public async void NodeInfoStatisticsTest()
+    {
+        var options = GetDefaultParams();
+
+        using var pool = new Pool(options);
+
+        var callbackText = string.Empty;
+
+        var ctx = new CallContext
+        {
+            Callback = (cs) => callbackText = $"{cs.MethodName} took {cs.ElapsedMicroSeconds} microseconds"
+        };
+
+        var error = await pool.Dial(ctx).ConfigureAwait(true);
+
+        Assert.Null(error);
+
+        using var client = FrostFSClient.GetSingleOwnerInstance(GetSingleOwnerOptions(this.keyString, this.url));
+
+        var result = await client.GetNodeInfoAsync();
+
+        Assert.False(string.IsNullOrEmpty(callbackText));
+        Assert.Contains(" took ", callbackText, StringComparison.Ordinal);
+    }
+
+    [Fact]
+    public async void GetSessionTest()
+    {
+        var options = GetDefaultParams();
+
+        using var pool = new Pool(options);
+
+        var error = await pool.Dial(new CallContext()).ConfigureAwait(true);
+
+        Assert.Null(error);
+
+        var prm = new PrmSessionCreate(100);
+
+        var token = await pool.CreateSessionAsync(prm).ConfigureAwait(true);
+
+        var session = new Session.SessionToken().Deserialize(token.Token);
+
+        var ownerHash = Base58.Decode(OwnerId!.Value);
+
+        Assert.NotNull(session);
+        Assert.Null(session.Body.Container);
+        Assert.Null(session.Body.Object);
+        Assert.Equal(16, session.Body.Id.Length);
+        Assert.Equal(100ul, session.Body.Lifetime.Exp);
+        Assert.Equal(ownerHash, session.Body.OwnerId.Value);
+        Assert.Equal(33, session.Body.SessionKey.Length);
+        Assert.Equal(ContextOneofCase.None, session.Body.ContextCase);
+    }
+
+    [Fact]
+    public async void CreateObjectWithSessionToken()
+    {
+        var options = GetDefaultParams();
+
+        using var pool = new Pool(options);
+
+        var error = await pool.Dial(new CallContext()).ConfigureAwait(true);
+
+        Assert.Null(error);
+
+        await Cleanup(pool);
+
+        var token = await pool.CreateSessionAsync(new PrmSessionCreate(int.MaxValue));
+
+        var createContainerParam = new PrmContainerCreate(
+            new FrostFsContainerInfo(new FrostFsPlacementPolicy(true, new FrostFsReplica(1))));
+
+        createContainerParam.XHeaders.Add("key1", "value1");
+
+        var containerId = await pool.CreateContainerAsync(createContainerParam);
+
+        var bytes = GetRandomBytes(1024);
+
+        var param = new PrmObjectPut
+        {
+            Header = new FrostFsObjectHeader(
+                containerId: containerId,
+                type: FrostFsObjectType.Regular,
+                [new FrostFsAttributePair("fileName", "test")]),
+            Payload = new MemoryStream(bytes),
+            ClientCut = false,
+            SessionToken = token
+        };
+
+        var objectId = await pool.PutObjectAsync(param).ConfigureAwait(true);
+
+        var @object = await pool.GetObjectAsync(new PrmObjectGet(containerId, objectId));
+
+        var downloadedBytes = new byte[@object.Header.PayloadLength];
+        MemoryStream ms = new(downloadedBytes);
+
+        ReadOnlyMemory<byte>? chunk = null;
+        while ((chunk = await @object.ObjectReader!.ReadChunk()) != null)
+        {
+            ms.Write(chunk.Value.Span);
+        }
+
+        Assert.Equal(SHA256.HashData(bytes), SHA256.HashData(downloadedBytes));
+
+        await Cleanup(pool);
+    }
+
+    [Fact]
+    public async void FilterTest()
+    {
+        var options = GetDefaultParams();
+
+        using var pool = new Pool(options);
+
+        var error = await pool.Dial(new CallContext()).ConfigureAwait(true);
+
+        Assert.Null(error);
+
+        await Cleanup(pool);
+
+        var createContainerParam = new PrmContainerCreate(
+           new FrostFsContainerInfo(new FrostFsPlacementPolicy(true, new FrostFsReplica(1))))
+        {
+            WaitParams = lightWait
+        };
+
+        var containerId = await pool.CreateContainerAsync(createContainerParam);
+
+        var bytes = new byte[] { 1, 2, 3 };
+
+        var ParentHeader = new FrostFsObjectHeader(
+                containerId: containerId,
+                type: FrostFsObjectType.Regular)
+        {
+            PayloadLength = 3
+        };
+
+        var param = new PrmObjectPut
+        {
+            Header = new FrostFsObjectHeader(
+                containerId: containerId,
+                type: FrostFsObjectType.Regular,
+                [new FrostFsAttributePair("fileName", "test")],
+                new FrostFsSplit()),
+            Payload = new MemoryStream(bytes),
+            ClientCut = false
+        };
+
+        var objectId = await pool.PutObjectAsync(param);
+
+        var head = await pool.GetObjectHeadAsync(new PrmObjectHeadGet(containerId, objectId));
+
+        var ecdsaKey = this.keyString.LoadWif();
+
+        var networkInfo = await pool.GetNetmapSnapshotAsync();
+
+        await CheckFilter(pool, containerId, new FilterByContainerId(FrostFsMatchType.Equals, containerId));
+
+        await CheckFilter(pool, containerId, new FilterByOwnerId(FrostFsMatchType.Equals, FrostFsOwner.FromKey(ecdsaKey)));
+
+        await CheckFilter(pool, containerId, new FilterBySplitId(FrostFsMatchType.Equals, param.Header.Split!.SplitId));
+
+        await CheckFilter(pool, containerId, new FilterByAttributePair(FrostFsMatchType.Equals, "fileName", "test"));
+
+        await CheckFilter(pool, containerId, new FilterByObjectId(FrostFsMatchType.Equals, objectId));
+
+        await CheckFilter(pool, containerId, new FilterByVersion(FrostFsMatchType.Equals, networkInfo.NodeInfoCollection[0].Version));
+
+        await CheckFilter(pool, containerId, new FilterByEpoch(FrostFsMatchType.Equals, networkInfo.Epoch));
+
+        await CheckFilter(pool, containerId, new FilterByPayloadLength(FrostFsMatchType.Equals, 3));
+
+        var checkSum = CheckSum.CreateCheckSum(bytes);
+
+        await CheckFilter(pool, containerId, new FilterByPayloadHash(FrostFsMatchType.Equals, checkSum));
+
+        await CheckFilter(pool, containerId, new FilterByPhysicallyStored());
+    }
+
+    private static async Task CheckFilter(Pool pool, FrostFsContainerId containerId, IObjectFilter filter)
+    {
+        var resultObjectsCount = 0;
+
+        PrmObjectSearch searchParam = new(containerId) { Filters = [filter] };
+
+        await foreach (var objId in pool.SearchObjectsAsync(searchParam))
+        {
+            resultObjectsCount++;
+            var objHeader = await pool.GetObjectHeadAsync(new PrmObjectHeadGet(containerId, objId));
+        }
+
+        Assert.True(0 < resultObjectsCount, $"Filter for {filter.Key} doesn't work");
+    }
+
+    [Theory]
+    [InlineData(1)]
+    [InlineData(3 * 1024 * 1024)]            // exactly one chunk size - 3MB
+    [InlineData(6 * 1024 * 1024 + 100)]
+    public async void SimpleScenarioTest(int objectSize)
+    {
+        var options = GetDefaultParams();
+
+        using var pool = new Pool(options);
+
+        var error = await pool.Dial(new CallContext()).ConfigureAwait(true);
+
+        Assert.Null(error);
+
+        await Cleanup(pool);
+
+        bool callbackInvoked = false;
+        var ctx = new CallContext
+        {
+            // Timeout = TimeSpan.FromSeconds(20),
+            Callback = new((CallStatistics cs) =>
+            {
+                callbackInvoked = true;
+                Assert.True(cs.ElapsedMicroSeconds > 0);
+            })
+        };
+
+        var createContainerParam = new PrmContainerCreate(
+            new FrostFsContainerInfo(new FrostFsPlacementPolicy(true, new FrostFsReplica(1)), [new("testKey", "testValue")]))
+        {
+            Context = ctx
+        };
+
+        var createdContainer = await pool.CreateContainerAsync(createContainerParam);
+
+        var container = await pool.GetContainerAsync(new PrmContainerGet(createdContainer) { Context = ctx });
+        Assert.NotNull(container);
+        Assert.True(callbackInvoked);
+
+        var bytes = GetRandomBytes(objectSize);
+
+        var param = new PrmObjectPut
+        {
+            Header = new FrostFsObjectHeader(
+                containerId: createdContainer,
+                type: FrostFsObjectType.Regular,
+                [new FrostFsAttributePair("fileName", "test")]),
+            Payload = new MemoryStream(bytes),
+            ClientCut = false,
+            Context = new CallContext
+            {
+                Callback = new((CallStatistics cs) => Assert.True(cs.ElapsedMicroSeconds > 0))
+            }
+        };
+
+        var objectId = await pool.PutObjectAsync(param);
+
+        var filter = new FilterByAttributePair(FrostFsMatchType.Equals, "fileName", "test");
+
+        bool hasObject = false;
+        await foreach (var objId in pool.SearchObjectsAsync(new PrmObjectSearch(createdContainer) { Filters = [filter] }))
+        {
+            hasObject = true;
+
+            var objHeader = await pool.GetObjectHeadAsync(new PrmObjectHeadGet(createdContainer, objectId));
+            Assert.Equal((ulong)bytes.Length, objHeader.PayloadLength);
+            Assert.NotNull(objHeader.Attributes);
+            Assert.Single(objHeader.Attributes!);
+            Assert.Equal("fileName", objHeader.Attributes!.First().Key);
+            Assert.Equal("test", objHeader.Attributes!.First().Value);
+        }
+
+        Assert.True(hasObject);
+
+        var @object = await pool.GetObjectAsync(new PrmObjectGet(createdContainer, objectId));
+
+        var downloadedBytes = new byte[@object.Header.PayloadLength];
+        MemoryStream ms = new(downloadedBytes);
+
+        ReadOnlyMemory<byte>? chunk = null;
+        while ((chunk = await @object.ObjectReader!.ReadChunk()) != null)
+        {
+            ms.Write(chunk.Value.Span);
+        }
+
+        Assert.Equal(SHA256.HashData(bytes), SHA256.HashData(downloadedBytes));
+
+        await Cleanup(pool);
+
+        await foreach (var _ in pool.ListContainersAsync())
+        {
+            Assert.Fail("Containers exist");
+        }
+    }
+
+    [Theory]
+    [InlineData(1)]
+    [InlineData(3 * 1024 * 1024)]            // exactly one chunk size - 3MB
+    [InlineData(6 * 1024 * 1024 + 100)]
+    public async void SimpleScenarioWithSessionTest(int objectSize)
+    {
+        var options = GetDefaultParams();
+
+        using var pool = new Pool(options);
+
+        var error = await pool.Dial(new CallContext()).ConfigureAwait(true);
+
+        Assert.Null(error);
+
+        var token = await pool.CreateSessionAsync(new PrmSessionCreate(int.MaxValue));
+
+        await Cleanup(pool);
+
+        var ctx = new CallContext
+        {
+            Timeout = TimeSpan.FromSeconds(20),
+            Callback = new((CallStatistics cs) => Assert.True(cs.ElapsedMicroSeconds > 0))
+        };
+
+        var createContainerParam = new PrmContainerCreate(
+            new FrostFsContainerInfo(new FrostFsPlacementPolicy(true, new FrostFsReplica(1))))
+        {
+            Context = ctx
+        };
+
+        var container = await pool.CreateContainerAsync(createContainerParam);
+
+        var containerInfo = await pool.GetContainerAsync(new PrmContainerGet(container) { Context = ctx });
+        Assert.NotNull(containerInfo);
+
+        var bytes = GetRandomBytes(objectSize);
+
+        var param = new PrmObjectPut
+        {
+            Header = new FrostFsObjectHeader(
+                containerId: container,
+                type: FrostFsObjectType.Regular,
+                [new FrostFsAttributePair("fileName", "test")]),
+            Payload = new MemoryStream(bytes),
+            ClientCut = false,
+            Context = new CallContext
+            {
+                Callback = new((CallStatistics cs) => Assert.True(cs.ElapsedMicroSeconds > 0))
+            },
+            SessionToken = token
+        };
+
+        var objectId = await pool.PutObjectAsync(param);
+
+        var filter = new FilterByAttributePair(FrostFsMatchType.Equals, "fileName", "test");
+
+        bool hasObject = false;
+        await foreach (var objId in pool.SearchObjectsAsync(new PrmObjectSearch(container) { Filters = [filter], SessionToken = token }))
+        {
+            hasObject = true;
+
+            var objHeader = await pool.GetObjectHeadAsync(new PrmObjectHeadGet(container, objectId) { SessionToken = token });
+            Assert.Equal((ulong)bytes.Length, objHeader.PayloadLength);
+            Assert.NotNull(objHeader.Attributes);
+            Assert.Single(objHeader.Attributes);
+            Assert.Equal("fileName", objHeader.Attributes.First().Key);
+            Assert.Equal("test", objHeader.Attributes.First().Value);
+        }
+
+        Assert.True(hasObject);
+
+        var @object = await pool.GetObjectAsync(new PrmObjectGet(container, objectId) { SessionToken = token });
+
+        var downloadedBytes = new byte[@object.Header.PayloadLength];
+        MemoryStream ms = new(downloadedBytes);
+
+        ReadOnlyMemory<byte>? chunk = null;
+        while ((chunk = await @object.ObjectReader!.ReadChunk()) != null)
+        {
+            ms.Write(chunk.Value.Span);
+        }
+
+        Assert.Equal(SHA256.HashData(bytes), SHA256.HashData(downloadedBytes));
+
+        await Cleanup(pool);
+
+        await foreach (var _ in pool.ListContainersAsync())
+        {
+            Assert.Fail("Containers exist");
+        }
+    }
+
+    [Theory]
+    [InlineData(1)]
+    [InlineData(64 * 1024 * 1024)]      // exactly 1 block size - 64MB
+    [InlineData(64 * 1024 * 1024 - 1)]
+    [InlineData(64 * 1024 * 1024 + 1)]
+    [InlineData(2 * 64 * 1024 * 1024 + 256)]
+    [InlineData(200)]
+    public async void ClientCutScenarioTest(int objectSize)
+    {
+        var options = GetDefaultParams();
+
+        using var pool = new Pool(options);
+
+        var error = await pool.Dial(new CallContext()).ConfigureAwait(true);
+
+        Assert.Null(error);
+
+        await Cleanup(pool);
+
+        var createContainerParam = new PrmContainerCreate(new FrostFsContainerInfo(new FrostFsPlacementPolicy(true, new FrostFsReplica(1))))
+        {
+            WaitParams = lightWait
+        };
+
+        var containerId = await pool.CreateContainerAsync(createContainerParam);
+
+        var ctx = new CallContext
+        {
+            Timeout = TimeSpan.FromSeconds(10),
+            Interceptors = new([new MetricsInterceptor()])
+        };
+
+        var container = await pool.GetContainerAsync(new PrmContainerGet(containerId) { Context = ctx });
+
+        Assert.NotNull(container);
+
+        byte[] bytes = GetRandomBytes(objectSize);
+
+        var param = new PrmObjectPut
+        {
+            Header = new FrostFsObjectHeader(
+                containerId: containerId,
+                type: FrostFsObjectType.Regular,
+                [new FrostFsAttributePair("fileName", "test")]),
+            Payload = new MemoryStream(bytes),
+            ClientCut = true
+        };
+
+        var objectId = await pool.PutObjectAsync(param);
+
+        var filter = new FilterByAttributePair(FrostFsMatchType.Equals, "fileName", "test");
+
+        bool hasObject = false;
+        await foreach (var objId in pool.SearchObjectsAsync(new PrmObjectSearch(containerId, filter)))
+        {
+            hasObject = true;
+
+            var objHeader = await pool.GetObjectHeadAsync(new PrmObjectHeadGet(containerId, objectId));
+            Assert.Equal((ulong)bytes.Length, objHeader.PayloadLength);
+            Assert.NotNull(objHeader.Attributes);
+            Assert.Single(objHeader.Attributes);
+            Assert.Equal("fileName", objHeader.Attributes[0].Key);
+            Assert.Equal("test", objHeader.Attributes[0].Value);
+        }
+
+        Assert.True(hasObject);
+
+        var @object = await pool.GetObjectAsync(new PrmObjectGet(containerId, objectId));
+
+        var downloadedBytes = new byte[@object.Header.PayloadLength];
+        MemoryStream ms = new(downloadedBytes);
+
+        ReadOnlyMemory<byte>? chunk = null;
+        while ((chunk = await @object.ObjectReader!.ReadChunk()) != null)
+        {
+            ms.Write(chunk.Value.Span);
+        }
+
+        Assert.Equal(SHA256.HashData(bytes), SHA256.HashData(downloadedBytes));
+
+        await CheckFilter(pool, containerId, new FilterByRootObject());
+
+        await Cleanup(pool);
+
+        var deadline = DateTime.UtcNow.Add(TimeSpan.FromSeconds(5));
+
+        IAsyncEnumerator<FrostFsContainerId>? enumerator = null;
+        do
+        {
+            if (deadline <= DateTime.UtcNow)
+            {
+                Assert.Fail("Containers exist");
+                break;
+            }
+
+            enumerator = pool.ListContainersAsync().GetAsyncEnumerator();
+            await Task.Delay(500);
+        }
+        while (await enumerator!.MoveNextAsync());
+    }
+
+    private static byte[] GetRandomBytes(int size)
+    {
+        Random rnd = new();
+        var bytes = new byte[size];
+        rnd.NextBytes(bytes);
+        return bytes;
+    }
+
+    private static IOptions<SingleOwnerClientSettings> GetSingleOwnerOptions(string key, string url)
+    {
+        return Options.Create(new SingleOwnerClientSettings
+        {
+            Key = key,
+            Host = url
+        });
+    }
+
+    private static IOptions<ClientSettings> GetOptions(string url)
+    {
+        return Options.Create(new ClientSettings
+        {
+            Host = url
+        });
+    }
+
+    static async Task Cleanup(Pool pool)
+    {
+        await foreach (var cid in pool.ListContainersAsync())
+        {
+            await pool.DeleteContainerAsync(new PrmContainerDelete(cid) { WaitParams = lightWait }).ConfigureAwait(true);
+        }
+    }
+}

src/FrostFS.SDK.Tests/SessionTests.cs

@@ -1,56 +1,11 @@
-using System.Security.Cryptography;
+using System.Diagnostics.CodeAnalysis;
 
 using FrostFS.SDK.ClientV2;
-using FrostFS.SDK.ClientV2.Interfaces;
 using FrostFS.SDK.ClientV2.Mappers.GRPC;
-using FrostFS.SDK.ClientV2;
-using FrostFS.SDK.Cryptography;
-
-using Microsoft.Extensions.Options;
 
 namespace FrostFS.SDK.Tests;
 
-public abstract class SessionTestsBase
+[SuppressMessage("Reliability", "CA2007:Consider calling ConfigureAwait on the awaited task", Justification = "Default Value is correct for tests")]
-{
-    protected readonly string key = "KwHDAJ66o8FoLBjVbjP2sWBmgBMGjt7Vv4boA7xQrBoAYBE397Aq";
-
-    protected IOptions<SingleOwnerClientSettings> Settings { get; set; }
-
-
-    protected ECDsa ECDsaKey { get; set; }
-    protected FrostFsOwner OwnerId { get; set; }
-    protected SessionMocker Mocker { get; set; }
-
-    protected SessionTestsBase()
-    {
-        Settings = Options.Create(new SingleOwnerClientSettings
-        {
-            Key = key,
-            Host = "http://localhost:8080"
-        });
-
-        ECDsaKey = key.LoadWif();
-        OwnerId = FrostFsOwner.FromKey(ECDsaKey);
-
-        Mocker = new SessionMocker(this.key)
-        {
-            PlacementPolicy = new FrostFsPlacementPolicy(true, new FrostFsReplica(1)),
-            Version = new FrostFsVersion(2, 13)
-        };
-    }
-
-    protected IFrostFSClient GetClient()
-    {
-        return ClientV2.FrostFSClient.GetTestInstance(
-            Settings,
-            null,
-            new NetworkMocker(this.key).GetMock().Object,
-            Mocker.GetMock().Object,
-            new ContainerMocker(this.key).GetMock().Object,
-            new ObjectMocker(this.key).GetMock().Object);
-    }
-}
-
 public class SessionTest : SessionTestsBase
 {
     [Theory]
@@ -64,7 +19,7 @@ public class SessionTest : SessionTestsBase
         if (useContext)
         {
             param.XHeaders.Add("headerKey1", "headerValue1");
-            param.Context = new Context
+            param.Context = new CallContext
             {
                 CancellationToken = Mocker.CancellationTokenSource.Token,
                 Timeout = TimeSpan.FromSeconds(20),
@@ -101,7 +56,6 @@ public class SessionTest : SessionTestsBase
         Assert.NotNull(Mocker.CreateSessionRequest.MetaHeader);
         Assert.Equal(Mocker.Version.ToMessage(), Mocker.CreateSessionRequest.MetaHeader.Version);
 
-
         Assert.Null(Mocker.Metadata);
 
         if (useContext)

src/FrostFS.SDK.Tests/SessionTestsBase.cs

@@ -0,0 +1,48 @@
+using System.Security.Cryptography;
+
+using FrostFS.SDK.ClientV2.Interfaces;
+using FrostFS.SDK.Cryptography;
+
+using Microsoft.Extensions.Options;
+
+namespace FrostFS.SDK.Tests;
+
+public abstract class SessionTestsBase
+{
+    internal readonly string key = "KwHDAJ66o8FoLBjVbjP2sWBmgBMGjt7Vv4boA7xQrBoAYBE397Aq";
+
+    protected IOptions<SingleOwnerClientSettings> Settings { get; set; }
+
+    protected ECDsa ECDsaKey { get; set; }
+    protected FrostFsOwner OwnerId { get; set; }
+    protected SessionMocker Mocker { get; set; }
+
+    protected SessionTestsBase()
+    {
+        Settings = Options.Create(new SingleOwnerClientSettings
+        {
+            Key = key,
+            Host = "http://localhost:8080"
+        });
+
+        ECDsaKey = key.LoadWif();
+        OwnerId = FrostFsOwner.FromKey(ECDsaKey);
+
+        Mocker = new SessionMocker(this.key)
+        {
+            PlacementPolicy = new FrostFsPlacementPolicy(true, new FrostFsReplica(1)),
+            Version = new FrostFsVersion(2, 13)
+        };
+    }
+
+    protected IFrostFSClient GetClient()
+    {
+        return ClientV2.FrostFSClient.GetTestInstance(
+            Settings,
+            null,
+            new NetworkMocker(this.key).GetMock().Object,
+            Mocker.GetMock().Object,
+            new ContainerMocker(this.key).GetMock().Object,
+            new ObjectMocker(this.key).GetMock().Object);
+    }
+}

src/FrostFS.SDK.Tests/SmokeClientTests.cs

@@ -1,24 +1,42 @@
+using System.Diagnostics.CodeAnalysis;
 using System.Security.Cryptography;
+
 using FrostFS.SDK.ClientV2;
 using FrostFS.SDK.ClientV2.Interfaces;
 using FrostFS.SDK.Cryptography;
+
 using Microsoft.Extensions.Options;
 
 using static FrostFS.Session.SessionToken.Types.Body;
-using FrostFS.SDK.ClientV2;
 
 namespace FrostFS.SDK.SmokeTests;
 
-public class SmokeTests : SmokeTestsBase
+[SuppressMessage("Reliability", "CA2007:Consider calling ConfigureAwait on the awaited task", Justification = "Default Value is correct for tests")]
+[SuppressMessage("Security", "CA5394:Do not use insecure randomness", Justification = "No secure purpose")]
+public class SmokeClientTests : SmokeTestsBase
 {
     private static readonly PrmWait lightWait = new(100, 1);
 
+    [Theory]
+    [InlineData(false)]
+    [InlineData(true)]
+    public async void AccountTest(bool isSingleOnwerClient)
+    {
+        using var client = isSingleOnwerClient
+            ? FrostFSClient.GetSingleOwnerInstance(GetSingleOwnerOptions(this.keyString, this.url))
+            : FrostFSClient.GetInstance(GetOptions(this.url));
+
+        PrmBalance? prm = isSingleOnwerClient ? default : new() { Context = Ctx };
+
+        var result = await client.GetBalanceAsync(prm);
+    }
+
     [Theory]
     [InlineData(false)]
     [InlineData(true)]
     public async void NetworkMapTest(bool isSingleOnwerClient)
     {
-        using var client = isSingleOnwerClient ? FrostFSClient.GetSingleOwnerInstance(GetSingleOwnerOptions(this.key, this.url)) : FrostFSClient.GetInstance(GetOptions(this.url));
+        using var client = isSingleOnwerClient ? FrostFSClient.GetSingleOwnerInstance(GetSingleOwnerOptions(this.keyString, this.url)) : FrostFSClient.GetInstance(GetOptions(this.url));
 
         PrmNetmapSnapshot? prm = isSingleOnwerClient ? default : new() { Context = Ctx };
         var result = await client.GetNetmapSnapshotAsync(prm);
@@ -41,7 +59,7 @@ public class SmokeTests : SmokeTestsBase
     [InlineData(true)]
     public async void NodeInfoTest(bool isSingleOnwerClient)
     {
-        using var client = isSingleOnwerClient ? FrostFSClient.GetSingleOwnerInstance(GetSingleOwnerOptions(this.key, this.url)) : FrostFSClient.GetInstance(GetOptions(this.url));
+        using var client = isSingleOnwerClient ? FrostFSClient.GetSingleOwnerInstance(GetSingleOwnerOptions(this.keyString, this.url)) : FrostFSClient.GetInstance(GetOptions(this.url));
 
         PrmNodeInfo? prm = isSingleOnwerClient ? default : new() { Context = Ctx };
 
@@ -56,14 +74,14 @@ public class SmokeTests : SmokeTestsBase
     }
 
     [Fact]
-    public async void NodeInfo_Statistics_Test()
+    public async void NodeInfoStatisticsTest()
     {
-        var ctx = new Context
+        var ctx = new CallContext
         {
             Callback = (cs) => Console.WriteLine($"{cs.MethodName} took {cs.ElapsedMicroSeconds} microseconds")
         };
 
-        using var client = FrostFSClient.GetSingleOwnerInstance(GetSingleOwnerOptions(this.key, this.url));
+        using var client = FrostFSClient.GetSingleOwnerInstance(GetSingleOwnerOptions(this.keyString, this.url));
 
         var result = await client.GetNodeInfoAsync();
     }
@@ -73,7 +91,7 @@ public class SmokeTests : SmokeTestsBase
     [InlineData(true)]
     public async void GetSessionTest(bool isSingleOnwerClient)
     {
-        using var client = isSingleOnwerClient ? FrostFSClient.GetSingleOwnerInstance(GetSingleOwnerOptions(this.key, this.url)) : FrostFSClient.GetInstance(GetOptions(this.url));
+        using var client = isSingleOnwerClient ? FrostFSClient.GetSingleOwnerInstance(GetSingleOwnerOptions(this.keyString, this.url)) : FrostFSClient.GetInstance(GetOptions(this.url));
 
         PrmSessionCreate? prm = isSingleOnwerClient ? new PrmSessionCreate(100) : new PrmSessionCreate(100) { Context = Ctx };
 
@@ -81,7 +99,7 @@ public class SmokeTests : SmokeTestsBase
 
         var session = new Session.SessionToken().Deserialize(token.Token);
 
-        var ownerHash = Base58.Decode(OwnerId.Value);
+        var ownerHash = Base58.Decode(OwnerId!.Value);
 
         Assert.NotNull(session);
         Assert.Null(session.Body.Container);
@@ -96,7 +114,7 @@ public class SmokeTests : SmokeTestsBase
     [Fact]
     public async void CreateObjectWithSessionToken()
     {
-        using var client = FrostFSClient.GetSingleOwnerInstance(GetSingleOwnerOptions(this.key, this.url));
+        using var client = FrostFSClient.GetSingleOwnerInstance(GetSingleOwnerOptions(this.keyString, this.url));
 
         await Cleanup(client);
 
@@ -144,11 +162,7 @@ public class SmokeTests : SmokeTestsBase
     [Fact]
     public async void FilterTest()
     {
-        using var client = FrostFSClient.GetSingleOwnerInstance(GetSingleOwnerOptions(this.key, this.url));
+        using var client = FrostFSClient.GetSingleOwnerInstance(GetSingleOwnerOptions(this.keyString, this.url));
-
-        //var prm = new PrmApeChainList(new FrostFsChainTarget(FrostFsTargetType.Namespace, "root"));
-
-        //var chains = await client.ListChainAsync(prm);
 
         await Cleanup(client);
 
@@ -184,7 +198,7 @@ public class SmokeTests : SmokeTestsBase
 
         var head = await client.GetObjectHeadAsync(new PrmObjectHeadGet(containerId, objectId));
 
-        var ecdsaKey = this.key.LoadWif();
+        var ecdsaKey = this.keyString.LoadWif();
 
         var networkInfo = await client.GetNetmapSnapshotAsync();
 
@@ -192,7 +206,7 @@ public class SmokeTests : SmokeTestsBase
 
         await CheckFilter(client, containerId, new FilterByOwnerId(FrostFsMatchType.Equals, FrostFsOwner.FromKey(ecdsaKey)));
 
-        await CheckFilter(client, containerId, new FilterBySplitId(FrostFsMatchType.Equals, param.Header.Split.SplitId));
+        await CheckFilter(client, containerId, new FilterBySplitId(FrostFsMatchType.Equals, param.Header.Split!.SplitId));
 
         await CheckFilter(client, containerId, new FilterByAttributePair(FrostFsMatchType.Equals, "fileName", "test"));
 
@@ -232,12 +246,12 @@ public class SmokeTests : SmokeTestsBase
     [InlineData(6 * 1024 * 1024 + 100)]
     public async void SimpleScenarioTest(int objectSize)
     {
-        using var client = FrostFSClient.GetSingleOwnerInstance(GetSingleOwnerOptions(this.key, this.url));
+        using var client = FrostFSClient.GetSingleOwnerInstance(GetSingleOwnerOptions(this.keyString, this.url));
 
         await Cleanup(client);
 
         bool callbackInvoked = false;
-        var ctx = new Context
+        var ctx = new CallContext
         {
             // Timeout = TimeSpan.FromSeconds(20),
             Callback = new((CallStatistics cs) =>
@@ -269,7 +283,7 @@ public class SmokeTests : SmokeTestsBase
                 [new FrostFsAttributePair("fileName", "test")]),
             Payload = new MemoryStream(bytes),
             ClientCut = false,
-            Context = new Context
+            Context = new CallContext
             {
                 Callback = new((CallStatistics cs) => Assert.True(cs.ElapsedMicroSeconds > 0))
             }
@@ -286,6 +300,7 @@ public class SmokeTests : SmokeTestsBase
 
             var objHeader = await client.GetObjectHeadAsync(new PrmObjectHeadGet(createdContainer, objectId));
             Assert.Equal((ulong)bytes.Length, objHeader.PayloadLength);
+            Assert.NotNull(objHeader.Attributes);
             Assert.Single(objHeader.Attributes);
             Assert.Equal("fileName", objHeader.Attributes.First().Key);
             Assert.Equal("test", objHeader.Attributes.First().Value);
@@ -304,7 +319,7 @@ public class SmokeTests : SmokeTestsBase
             ms.Write(chunk.Value.Span);
         }
 
-        Assert.Equal(MD5.HashData(bytes), MD5.HashData(downloadedBytes));
+        Assert.Equal(SHA256.HashData(bytes), SHA256.HashData(downloadedBytes));
 
         await Cleanup(client);
 
@@ -320,13 +335,13 @@ public class SmokeTests : SmokeTestsBase
     [InlineData(6 * 1024 * 1024 + 100)]
     public async void SimpleScenarioWithSessionTest(int objectSize)
     {
-        using var client = FrostFSClient.GetSingleOwnerInstance(GetSingleOwnerOptions(this.key, this.url));
+        using var client = FrostFSClient.GetSingleOwnerInstance(GetSingleOwnerOptions(this.keyString, this.url));
 
         var token = await client.CreateSessionAsync(new PrmSessionCreate(int.MaxValue));
 
         await Cleanup(client);
 
-        var ctx = new Context
+        var ctx = new CallContext
         {
             Timeout = TimeSpan.FromSeconds(20),
             Callback = new((CallStatistics cs) => Assert.True(cs.ElapsedMicroSeconds > 0))
@@ -353,7 +368,7 @@ public class SmokeTests : SmokeTestsBase
                 [new FrostFsAttributePair("fileName", "test")]),
             Payload = new MemoryStream(bytes),
             ClientCut = false,
-            Context = new Context
+            Context = new CallContext
             {
                 Callback = new((CallStatistics cs) => Assert.True(cs.ElapsedMicroSeconds > 0))
             },
@@ -371,6 +386,7 @@ public class SmokeTests : SmokeTestsBase
 
             var objHeader = await client.GetObjectHeadAsync(new PrmObjectHeadGet(container, objectId) { SessionToken = token });
             Assert.Equal((ulong)bytes.Length, objHeader.PayloadLength);
+            Assert.NotNull(objHeader.Attributes);
             Assert.Single(objHeader.Attributes);
             Assert.Equal("fileName", objHeader.Attributes.First().Key);
             Assert.Equal("test", objHeader.Attributes.First().Value);
@@ -389,7 +405,7 @@ public class SmokeTests : SmokeTestsBase
             ms.Write(chunk.Value.Span);
         }
 
-        Assert.Equal(MD5.HashData(bytes), MD5.HashData(downloadedBytes));
+        Assert.Equal(SHA256.HashData(bytes), SHA256.HashData(downloadedBytes));
 
         await Cleanup(client);
 
@@ -408,7 +424,7 @@ public class SmokeTests : SmokeTestsBase
     [InlineData(200)]
     public async void ClientCutScenarioTest(int objectSize)
     {
-        using var client = FrostFSClient.GetSingleOwnerInstance(GetSingleOwnerOptions(this.key, this.url));
+        using var client = FrostFSClient.GetSingleOwnerInstance(GetSingleOwnerOptions(this.keyString, this.url));
 
         await Cleanup(client);
 
@@ -419,7 +435,7 @@ public class SmokeTests : SmokeTestsBase
 
         var containerId = await client.CreateContainerAsync(createContainerParam);
 
-        var ctx = new Context
+        var ctx = new CallContext
         {
             Timeout = TimeSpan.FromSeconds(10),
             Interceptors = new([new MetricsInterceptor()])
@@ -452,6 +468,7 @@ public class SmokeTests : SmokeTestsBase
 
             var objHeader = await client.GetObjectHeadAsync(new PrmObjectHeadGet(containerId, objectId));
             Assert.Equal((ulong)bytes.Length, objHeader.PayloadLength);
+            Assert.NotNull(objHeader.Attributes);
             Assert.Single(objHeader.Attributes);
             Assert.Equal("fileName", objHeader.Attributes[0].Key);
             Assert.Equal("test", objHeader.Attributes[0].Value);
@@ -470,7 +487,7 @@ public class SmokeTests : SmokeTestsBase
             ms.Write(chunk.Value.Span);
         }
 
-        Assert.Equal(MD5.HashData(bytes), MD5.HashData(downloadedBytes));
+        Assert.Equal(SHA256.HashData(bytes), SHA256.HashData(downloadedBytes));
 
         await CheckFilter(client, containerId, new FilterByRootObject());
 

src/FrostFS.SDK.Tests/SmokeTestsBase.cs

@@ -7,24 +7,24 @@ namespace FrostFS.SDK.SmokeTests;
 
 public abstract class SmokeTestsBase
 {
-    protected readonly string key = "KzPXA6669m2pf18XmUdoR8MnP1pi1PMmefiFujStVFnv7WR5SRmK";
+    internal readonly string keyString = "KzPXA6669m2pf18XmUdoR8MnP1pi1PMmefiFujStVFnv7WR5SRmK";
 
-    protected readonly string url = "http://172.23.32.4:8080";
+    internal readonly string url = "http://172.23.32.4:8080";
 
-    protected ECDsa Key { get; }
+    protected ECDsa? Key { get; }
 
-    protected FrostFsOwner OwnerId { get; }
+    protected FrostFsOwner? OwnerId { get; }
 
-    protected FrostFsVersion Version { get; }
+    protected FrostFsVersion? Version { get; }
 
-    protected Context Ctx { get; }
+    protected CallContext? Ctx { get; }
 
     protected SmokeTestsBase()
     {
-        Key = key.LoadWif();
+        Key = keyString.LoadWif();
         OwnerId = FrostFsOwner.FromKey(Key);
         Version = new FrostFsVersion(2, 13);
 
-        Ctx = new Context { Key = Key, OwnerId = OwnerId, Version = Version };
+        Ctx = new CallContext { Key = Key, OwnerId = OwnerId, Version = Version };
     }
 }