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

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

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

@@ -0,0 +1,25 @@
+using System;
+
+namespace FrostFS.SDK.ClientV2;
+
+public class FrostFsResponseException : FrostFsException
+{
+    public FrostFsResponseStatus? Status { get; private set; }
+
+    public FrostFsResponseException()
+    {
+    }
+
+    public FrostFsResponseException(FrostFsResponseStatus status)
+    {
+        Status = status;
+    }
+
+    public FrostFsResponseException(string message) : base(message)
+    {
+    }
+
+    public FrostFsResponseException(string message, Exception innerException) : base(message, innerException)
+    {
+    }
+}

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

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

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

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

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

@@ -1,25 +0,0 @@
-using System;
-
-namespace FrostFS.SDK.ClientV2;
-
-public class ResponseException : Exception
-{
-    public FrostFsResponseStatus? Status { get; private set; }
-
-    public ResponseException()
-    {
-    }
-
-    public ResponseException(FrostFsResponseStatus status)
-    {
-        Status = status;
-    }
-
-    public ResponseException(string message) : base(message)
-    {
-    }
-
-    public ResponseException(string message, Exception innerException) : base(message, innerException)
-    {
-    }
-}

src/FrostFS.SDK.ClientV2/FrostFS.SDK.ClientV2.csproj

@@ -22,10 +22,10 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="Microsoft.Extensions.Caching.Abstractions" Version="8.0.0" />
-    <PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="8.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="8.0.1" />
     <PackageReference Include="Microsoft.Extensions.Options" Version="8.0.2" />
     <PackageReference Include="System.Diagnostics.DiagnosticSource" Version="8.0.1" />
-    <PackageReference Include="System.Runtime.Caching" Version="8.0.0" />
+    <PackageReference Include="System.Runtime.Caching" Version="8.0.1" />
   </ItemGroup>
 
   <ItemGroup>

src/FrostFS.SDK.ClientV2/FrostFSClient.cs

@@ -39,7 +39,7 @@ public class FrostFSClient : IFrostFSClient
 
     internal AccountingService.AccountingServiceClient? AccountingServiceClient { get; set; }
 
-    internal EnvironmentContext ClientCtx { get; set; }
+    internal ClientContext ClientCtx { get; set; }
 
     public static IFrostFSClient GetInstance(IOptions<ClientSettings> clientOptions, GrpcChannelOptions? channelOptions = null)
     {
@@ -93,7 +93,7 @@ public class FrostFSClient : IFrostFSClient
         var ecdsaKey = settings.Value.Key.LoadWif();
         FrostFsOwner.FromKey(ecdsaKey);
 
-        ClientCtx = new EnvironmentContext(
+        ClientCtx = new ClientContext(
            client: this,
            key: ecdsaKey,
            owner: FrostFsOwner.FromKey(ecdsaKey),
@@ -108,13 +108,13 @@ public class FrostFSClient : IFrostFSClient
 
     private FrostFSClient(IOptions<ClientSettings> options, GrpcChannelOptions? channelOptions)
     {
-        var clientSettings = (options?.Value) ?? throw new ArgumentException("Options must be initialized");
+        var clientSettings = (options?.Value) ?? throw new ArgumentNullException(nameof(options), "Options value must be initialized");
 
         clientSettings.Validate();
 
         var channel = InitGrpcChannel(clientSettings.Host, channelOptions);
 
-        ClientCtx = new EnvironmentContext(
+        ClientCtx = new ClientContext(
             this,
             key: null,
             owner: null,
@@ -127,7 +127,7 @@ public class FrostFSClient : IFrostFSClient
 
     private FrostFSClient(IOptions<SingleOwnerClientSettings> options, GrpcChannelOptions? channelOptions)
     {
-        var clientSettings = (options?.Value) ?? throw new ArgumentException("Options must be initialized");
+        var clientSettings = (options?.Value) ?? throw new ArgumentNullException(nameof(options), "Options value must be initialized");
 
         clientSettings.Validate();
 
@@ -135,7 +135,7 @@ public class FrostFSClient : IFrostFSClient
 
         var channel = InitGrpcChannel(clientSettings.Host, channelOptions);
 
-        ClientCtx = new EnvironmentContext(
+        ClientCtx = new ClientContext(
             this,
             key: ecdsaKey,
             owner: FrostFsOwner.FromKey(ecdsaKey),
@@ -146,14 +146,17 @@ public class FrostFSClient : IFrostFSClient
         // CheckFrostFsVersionSupport(new Context { Timeout = TimeSpan.FromSeconds(20) });
     }
 
-    internal FrostFSClient(WrapperPrm prm)
+    internal FrostFSClient(WrapperPrm prm, SessionCache cache)
     {
-        ClientCtx = new EnvironmentContext(
+        ClientCtx = new ClientContext(
            client: this,
            key: prm.Key,
            owner: FrostFsOwner.FromKey(prm.Key!),
            channel: InitGrpcChannel(prm.Address, null), //prm.GrpcChannelOptions),
-           version: new FrostFsVersion(2, 13));
+           version: new FrostFsVersion(2, 13))
+        {
+            SessionCache = cache
+        };
     }
 
     public void Dispose()
@@ -363,10 +366,10 @@ public class FrostFSClient : IFrostFSClient
 
     private async void CheckFrostFsVersionSupport(CallContext? ctx = default)
     {
-        var args = new PrmNodeInfo { Context = ctx };
+        var args = new PrmNodeInfo(ctx);
 
         if (ctx?.Version == null)
-            throw new InvalidObjectException(nameof(ctx.Version));
+            throw new ArgumentNullException(nameof(ctx), "Version must be initialized");
 
         var service = GetNetmapService(args);
         var localNodeInfo = await service.GetLocalNodeInfoAsync(args).ConfigureAwait(false);
@@ -378,18 +381,16 @@ public class FrostFSClient : IFrostFSClient
         }
     }
 
-    private CallInvoker? SetupEnvironment(IContext ctx)
+    private CallInvoker? SetupClientContext(IContext ctx)
     {
         if (isDisposed)
-            throw new InvalidObjectException("Client is disposed.");
+            throw new FrostFsInvalidObjectException("Client is disposed.");
 
-        ctx.Context ??= new CallContext();
+        if (ctx.Context!.Key == null)
-
-        if (ctx.Context.Key == null)
         {
             if (ClientCtx.Key == null)
             {
-                throw new InvalidObjectException("Key is not initialized.");
+                throw new ArgumentNullException(nameof(ctx), "Key is not initialized.");
             }
 
             ctx.Context.Key = ClientCtx.Key.ECDsaKey;
@@ -404,24 +405,23 @@ public class FrostFSClient : IFrostFSClient
         {
             if (ClientCtx.Version == null)
             {
-                throw new InvalidObjectException("Version is not initialized.");
+                throw new ArgumentNullException(nameof(ctx), "Version is not initialized.");
             }
 
             ctx.Context.Version = ClientCtx.Version;
         }
 
         CallInvoker? callInvoker = null;
-        if (ctx.Context.Interceptors != null && ctx.Context.Interceptors.Count > 0)
+
-        {
         foreach (var interceptor in ctx.Context.Interceptors)
-            {
             callInvoker = AddInvoker(callInvoker, interceptor);
-            }
-        }
 
         if (ctx.Context.Callback != null)
             callInvoker = AddInvoker(callInvoker, new MetricsInterceptor(ctx.Context.Callback));
 
+        if (ctx.Context.PoolErrorHandler != null)
+            callInvoker = AddInvoker(callInvoker, new ErrorInterceptor(ctx.Context.PoolErrorHandler));
+
         return callInvoker;
 
         CallInvoker AddInvoker(CallInvoker? callInvoker, Interceptor interceptor)
@@ -429,7 +429,7 @@ public class FrostFSClient : IFrostFSClient
             if (callInvoker == null)
                 callInvoker = ClientCtx.Channel.Intercept(interceptor);
             else
-                callInvoker.Intercept(interceptor);
+                callInvoker = callInvoker.Intercept(interceptor);
 
             return callInvoker;
         }
@@ -437,7 +437,7 @@ public class FrostFSClient : IFrostFSClient
 
     private NetmapServiceProvider GetNetmapService(IContext ctx)
     {
-        var callInvoker = SetupEnvironment(ctx);
+        var callInvoker = SetupClientContext(ctx);
         var client = NetmapServiceClient ?? (callInvoker != null
             ? new NetmapService.NetmapServiceClient(callInvoker)
             : new NetmapService.NetmapServiceClient(ClientCtx.Channel));
@@ -447,7 +447,7 @@ public class FrostFSClient : IFrostFSClient
 
     private SessionServiceProvider GetSessionService(IContext ctx)
     {
-        var callInvoker = SetupEnvironment(ctx);
+        var callInvoker = SetupClientContext(ctx);
         var client = SessionServiceClient ?? (callInvoker != null
             ? new SessionService.SessionServiceClient(callInvoker)
             : new SessionService.SessionServiceClient(ClientCtx.Channel));
@@ -457,7 +457,7 @@ public class FrostFSClient : IFrostFSClient
 
     private ApeManagerServiceProvider GetApeManagerService(IContext ctx)
     {
-        var callInvoker = SetupEnvironment(ctx);
+        var callInvoker = SetupClientContext(ctx);
         var client = ApeManagerServiceClient ?? (callInvoker != null
             ? new APEManagerService.APEManagerServiceClient(callInvoker)
             : new APEManagerService.APEManagerServiceClient(ClientCtx.Channel));
@@ -467,7 +467,7 @@ public class FrostFSClient : IFrostFSClient
 
     private AccountingServiceProvider GetAccouningService(IContext ctx)
     {
-        var callInvoker = SetupEnvironment(ctx);
+        var callInvoker = SetupClientContext(ctx);
         var client = AccountingServiceClient ?? (callInvoker != null
             ? new AccountingService.AccountingServiceClient(callInvoker)
             : new AccountingService.AccountingServiceClient(ClientCtx.Channel));
@@ -477,7 +477,7 @@ public class FrostFSClient : IFrostFSClient
 
     private ContainerServiceProvider GetContainerService(IContext ctx)
     {
-        var callInvoker = SetupEnvironment(ctx);
+        var callInvoker = SetupClientContext(ctx);
         var client = ContainerServiceClient ?? (callInvoker != null
             ? new ContainerService.ContainerServiceClient(callInvoker)
             : new ContainerService.ContainerServiceClient(ClientCtx.Channel));
@@ -487,7 +487,7 @@ public class FrostFSClient : IFrostFSClient
 
     private ObjectServiceProvider GetObjectService(IContext ctx)
     {
-        var callInvoker = SetupEnvironment(ctx);
+        var callInvoker = SetupClientContext(ctx);
         var client = ObjectServiceClient ?? (callInvoker != null
             ? new ObjectService.ObjectServiceClient(callInvoker)
             : new ObjectService.ObjectServiceClient(ClientCtx.Channel));
@@ -497,7 +497,7 @@ public class FrostFSClient : IFrostFSClient
 
     private AccountingServiceProvider GetAccountService(IContext ctx)
     {
-        var callInvoker = SetupEnvironment(ctx);
+        var callInvoker = SetupClientContext(ctx);
         var client = AccountingServiceClient ?? (callInvoker != null
             ? new AccountingService.AccountingServiceClient(callInvoker)
             : new AccountingService.AccountingServiceClient(ClientCtx.Channel));
@@ -527,20 +527,13 @@ public class FrostFSClient : IFrostFSClient
 
     public async Task<string?> Dial(CallContext ctx)
     {
-        try
+        var prm = new PrmBalance(ctx);
-        {
-            var prm = new PrmBalance { Context = ctx };
 
         var service = GetAccouningService(prm);
-            var balance = await service.GetBallance(prm).ConfigureAwait(false);
+        _ = await service.GetBallance(prm).ConfigureAwait(false);
 
         return null;
     }
-        catch (FrostFsException ex)
-        {
-            return ex.Message;
-        }
-    }
 
     public bool RestartIfUnhealthy(CallContext ctx)
     {

src/FrostFS.SDK.ClientV2/Interceptors/ErrorInterceptor.cs

@@ -0,0 +1,68 @@
+using System;
+using System.Threading.Tasks;
+
+using Grpc.Core;
+using Grpc.Core.Interceptors;
+
+namespace FrostFS.SDK.ClientV2;
+
+[System.Diagnostics.CodeAnalysis.SuppressMessage("Design", "CA1062:Validate arguments of public methods",
+        Justification = "parameters are provided by GRPC infrastructure")]
+public class ErrorInterceptor(Action<Exception> handler) : Interceptor
+{
+    public override AsyncUnaryCall<TResponse> AsyncUnaryCall<TRequest, TResponse>(
+        TRequest request,
+        ClientInterceptorContext<TRequest, TResponse> context,
+        AsyncUnaryCallContinuation<TRequest, TResponse> continuation)
+    {
+        var call = continuation(request, context);
+
+        return new AsyncUnaryCall<TResponse>(
+            HandleUnaryResponse(call),
+            call.ResponseHeadersAsync,
+            call.GetStatus,
+            call.GetTrailers,
+            call.Dispose);
+    }
+
+    public override AsyncClientStreamingCall<TRequest, TResponse> AsyncClientStreamingCall<TRequest, TResponse>(
+        ClientInterceptorContext<TRequest, TResponse> context,
+        AsyncClientStreamingCallContinuation<TRequest, TResponse> continuation)
+    {
+        var call = continuation(context);
+
+        return new AsyncClientStreamingCall<TRequest, TResponse>(
+            call.RequestStream,
+            HandleStreamResponse(call),
+            call.ResponseHeadersAsync,
+            call.GetStatus,
+            call.GetTrailers,
+            call.Dispose);
+    }
+
+    private async Task<TResponse> HandleUnaryResponse<TResponse>(AsyncUnaryCall<TResponse> call)
+    {
+        try
+        {
+            return await call;
+        }
+        catch (Exception ex)
+        {
+            handler(ex);
+            throw;
+        }
+    }
+
+    private async Task<TResponse> HandleStreamResponse<TRequest, TResponse>(AsyncClientStreamingCall<TRequest, TResponse> call)
+    {
+        try
+        {
+            return await call;
+        }
+        catch (Exception ex)
+        {
+            handler(ex);
+            throw;
+        }
+    }
+}

src/FrostFS.SDK.ClientV2/Interceptors/MetricsInterceptor.cs

@@ -7,6 +7,8 @@ using Grpc.Core.Interceptors;
 
 namespace FrostFS.SDK.ClientV2;
 
+[System.Diagnostics.CodeAnalysis.SuppressMessage("Design", "CA1062:Validate arguments of public methods",
+        Justification = "parameters are provided by GRPC infrastructure")]
 public class MetricsInterceptor(Action<CallStatistics> callback) : Interceptor
 {
     public override AsyncUnaryCall<TResponse> AsyncUnaryCall<TRequest, TResponse>(
@@ -14,11 +16,6 @@ public class MetricsInterceptor(Action<CallStatistics> callback) : Interceptor
         ClientInterceptorContext<TRequest, TResponse> context,
         AsyncUnaryCallContinuation<TRequest, TResponse> continuation)
     {
-        if (continuation is null)
-        {
-            throw new ArgumentNullException(nameof(continuation));
-        }
-
         var call = continuation(request, context);
 
         return new AsyncUnaryCall<TResponse>(
@@ -33,9 +30,6 @@ public class MetricsInterceptor(Action<CallStatistics> callback) : Interceptor
         ClientInterceptorContext<TRequest, TResponse> context,
         AsyncClientStreamingCallContinuation<TRequest, TResponse> continuation)
     {
-        if (continuation is null)
-            throw new ArgumentNullException(nameof(continuation));
-
         var call = continuation(context);
 
         return new AsyncClientStreamingCall<TRequest, TResponse>(
@@ -52,7 +46,7 @@ public class MetricsInterceptor(Action<CallStatistics> callback) : Interceptor
         var watch = new Stopwatch();
         watch.Start();
 
-        var response = await call.ResponseAsync.ConfigureAwait(false);
+        var response = await call;
 
         watch.Stop();
 
@@ -68,7 +62,7 @@ public class MetricsInterceptor(Action<CallStatistics> callback) : Interceptor
         var watch = new Stopwatch();
         watch.Start();
 
-        var response = await call.ResponseAsync.ConfigureAwait(false);
+        var response = await call;
 
         watch.Stop();
 

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

@@ -61,7 +61,5 @@ public interface IFrostFSClient : IDisposable
 
     public Task<string?> Dial(CallContext ctx);
 
-    public bool RestartIfUnhealthy(CallContext ctx);
-
     public void Close();
 }

src/FrostFS.SDK.ClientV2/Logging/FrostFsMessages.cs

@@ -0,0 +1,24 @@
+using Microsoft.Extensions.Logging;
+
+namespace FrostFS.SDK.ClientV2;
+
+internal static partial class FrostFsMessages
+{
+    [LoggerMessage(100,
+        LogLevel.Warning,
+        "Failed to create frostfs session token for client. Address {address}, {error}",
+        EventName = nameof(SessionCreationError))]
+    internal static partial void SessionCreationError(ILogger logger, string address, string error);
+
+    [LoggerMessage(101,
+        LogLevel.Warning,
+        "Error threshold reached. Address {address}, threshold {threshold}",
+        EventName = nameof(ErrorЕhresholdReached))]
+    internal static partial void ErrorЕhresholdReached(ILogger logger, string address, uint threshold);
+
+    [LoggerMessage(102,
+        LogLevel.Warning,
+        "Health has changed: {address} healthy {healthy}, reason {error}",
+        EventName = nameof(HealthChanged))]
+    internal static partial void HealthChanged(ILogger logger, string address, bool healthy, string error);
+}

src/FrostFS.SDK.ClientV2/Models/Client/ClientSettings.cs

@@ -15,7 +15,7 @@ public class ClientSettings
     {
         var errors = CheckFields();
         if (errors != null)
-            ThrowException(errors);
+            ThrowSettingsException(errors);
     }
 
     protected Collection<string>? CheckFields()
@@ -29,7 +29,7 @@ public class ClientSettings
         return null;
     }
 
-    protected static void ThrowException(Collection<string> errors)
+    protected static void ThrowSettingsException(Collection<string> errors)
     {
         if (errors is null)
         {
@@ -55,7 +55,7 @@ public class SingleOwnerClientSettings : ClientSettings
     {
         var errors = CheckFields();
         if (errors != null)
-            ThrowException(errors);
+            ThrowSettingsException(errors);
     }
 
     protected new Collection<string>? CheckFields()

src/FrostFS.SDK.ClientV2/Models/Containers/FrostFsContainerId.cs

@@ -31,7 +31,7 @@ public class FrostFsContainerId
             return this.modelId;
         }
 
-        throw new InvalidObjectException();
+        throw new FrostFsInvalidObjectException();
     }
 
     internal ContainerID ContainerID
@@ -47,7 +47,7 @@ public class FrostFsContainerId
                 return this.containerID;
             }
 
-            throw new InvalidObjectException();
+            throw new FrostFsInvalidObjectException();
         }
     }
 

src/FrostFS.SDK.ClientV2/Models/Containers/FrostFsContainerInfo.cs

@@ -88,7 +88,7 @@ public class FrostFsContainerInfo
         {
             if (PlacementPolicy == null)
             {
-                throw new InvalidObjectException("PlacementPolicy is null");
+                throw new ArgumentNullException("PlacementPolicy is null");
             }
 
             this.container = new Container.Container()

src/FrostFS.SDK.ClientV2/Models/Object/FrostFsObject.cs

@@ -1,4 +1,4 @@
-using FrostFS.SDK.ClientV2;
+using System;
 
 namespace FrostFS.SDK;
 
@@ -67,7 +67,7 @@ public class FrostFsObject
     public void SetParent(FrostFsObjectHeader largeObjectHeader)
     {
         if (Header?.Split == null)
-            throw new InvalidObjectException("The object is not initialized properly");
+            throw new ArgumentNullException(nameof(largeObjectHeader), "Split value must not be null");
 
         Header.Split.ParentHeader = largeObjectHeader;
     }

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

@@ -13,10 +13,10 @@ namespace FrostFS.SDK.ClientV2;
 
 public class CallContext()
 {
-    private ReadOnlyCollection<Interceptor>? interceptors;
-
     private ByteString? publicKeyCache;
 
+    internal Action<Exception>? PoolErrorHandler { get; set; }
+
     public ECDsa? Key { get; set; }
 
     public FrostFsOwner? OwnerId { get; set; }
@@ -31,11 +31,7 @@ public class CallContext()
 
     public Action<CallStatistics>? Callback { get; set; }
 
-    public ReadOnlyCollection<Interceptor>? Interceptors
+    public Collection<Interceptor> Interceptors { get; } = [];
-    {
-        get { return this.interceptors; }
-        set { this.interceptors = value; }
-    }
 
     public ByteString? GetPublicKeyCache()
     {

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>
-    CallContext? Context { get; set; }
+    CallContext? Context { get; }
 }

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

@@ -1,6 +1,6 @@
 namespace FrostFS.SDK.ClientV2;
 
-public sealed class PrmApeChainList(FrostFsChainTarget target) : PrmBase
+public sealed class PrmApeChainList(FrostFsChainTarget target, CallContext? ctx = null) : PrmBase(ctx)
 {
     public FrostFsChainTarget Target { get; } = target;
 }

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

@@ -1,6 +1,6 @@
 namespace FrostFS.SDK.ClientV2;
 
-public sealed class PrmApeChainRemove(FrostFsChainTarget target, FrostFsChain chain) : PrmBase
+public sealed class PrmApeChainRemove(FrostFsChainTarget target, FrostFsChain chain, CallContext? ctx = null) : PrmBase(ctx)
 {
     public FrostFsChainTarget Target { get; } = target;
 

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

@@ -1,6 +1,6 @@
 namespace FrostFS.SDK.ClientV2;
 
-public sealed class PrmApeChainAdd(FrostFsChainTarget target, FrostFsChain chain) : PrmBase
+public sealed class PrmApeChainAdd(FrostFsChainTarget target, FrostFsChain chain, CallContext? ctx = null) : PrmBase(ctx)
 {
     public FrostFsChainTarget Target { get; } = target;
 

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

@@ -1,5 +1,5 @@
 namespace FrostFS.SDK.ClientV2;
 
-public sealed class PrmBalance() : PrmBase
+public sealed class PrmBalance(CallContext? ctx = null) : PrmBase(ctx)
 {
 }

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

@@ -2,7 +2,7 @@
 
 namespace FrostFS.SDK.ClientV2;
 
-public class PrmBase(NameValueCollection? xheaders = null) : IContext
+public class PrmBase(CallContext? ctx, NameValueCollection? xheaders = null) : IContext
 {
     /// <summary>
     /// FrostFS request X-Headers
@@ -10,5 +10,5 @@ public class PrmBase(NameValueCollection? xheaders = null) : IContext
     public NameValueCollection XHeaders { get; } = xheaders ?? [];
 
     /// <inheritdoc />
-    public CallContext? Context { get; set; }
+    public CallContext Context { get; } = ctx ?? new CallContext();
 }

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

@@ -1,6 +1,6 @@
 namespace FrostFS.SDK.ClientV2;
 
-public sealed class PrmContainerCreate(FrostFsContainerInfo container) : PrmBase, ISessionToken
+public sealed class PrmContainerCreate(FrostFsContainerInfo container, CallContext? ctx = null) : PrmBase(ctx), ISessionToken
 {
     public FrostFsContainerInfo Container { get; set; } = container;
 

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

@@ -1,6 +1,6 @@
 namespace FrostFS.SDK.ClientV2;
 
-public sealed class PrmContainerDelete(FrostFsContainerId containerId) : PrmBase, ISessionToken
+public sealed class PrmContainerDelete(FrostFsContainerId containerId, CallContext? ctx = null) : PrmBase(ctx), ISessionToken
 {
     public FrostFsContainerId ContainerId { get; set; } = containerId;
 

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

@@ -1,6 +1,6 @@
 namespace FrostFS.SDK.ClientV2;
 
-public sealed class PrmContainerGet(FrostFsContainerId container) : PrmBase
+public sealed class PrmContainerGet(FrostFsContainerId container, CallContext? ctx = null) : PrmBase(ctx)
 {
     public FrostFsContainerId Container { get; set; } = container;
 }

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

@@ -1,5 +1,5 @@
 namespace FrostFS.SDK.ClientV2;
 
-public sealed class PrmContainerGetAll() : PrmBase()
+public sealed class PrmContainerGetAll(CallContext? ctx = null) : PrmBase(ctx)
 {
 }

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

@@ -1,5 +1,5 @@
 namespace FrostFS.SDK.ClientV2;
 
-public sealed class PrmNetmapSnapshot() : PrmBase
+public sealed class PrmNetmapSnapshot(CallContext? ctx = null) : PrmBase(ctx)
 {
 }

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

@@ -1,5 +1,5 @@
 namespace FrostFS.SDK.ClientV2;
 
-public sealed class PrmNetworkSettings() : PrmBase
+public sealed class PrmNetworkSettings(CallContext? ctx = null) : PrmBase(ctx)
 {
 }

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

@@ -1,5 +1,5 @@
 namespace FrostFS.SDK.ClientV2;
 
-public sealed class PrmNodeInfo() : PrmBase
+public sealed class PrmNodeInfo(CallContext? ctx = null) : PrmBase(ctx)
 {
 }

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

@@ -1,6 +1,6 @@
 namespace FrostFS.SDK.ClientV2;
 
-public sealed class PrmObjectDelete(FrostFsContainerId containerId, FrostFsObjectId objectId) : PrmBase, ISessionToken
+public sealed class PrmObjectDelete(FrostFsContainerId containerId, FrostFsObjectId objectId, CallContext? ctx = null) : PrmBase(ctx), ISessionToken
 {
     public FrostFsContainerId ContainerId { get; set; } = containerId;
 

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

@@ -1,6 +1,6 @@
 namespace FrostFS.SDK.ClientV2;
 
-public sealed class PrmObjectGet(FrostFsContainerId containerId, FrostFsObjectId objectId) : PrmBase, ISessionToken
+public sealed class PrmObjectGet(FrostFsContainerId containerId, FrostFsObjectId objectId, CallContext? ctx = null) : PrmBase(ctx), ISessionToken
 {
     public FrostFsContainerId ContainerId { get; set; } = containerId;
 

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

@@ -1,6 +1,6 @@
 namespace FrostFS.SDK.ClientV2;
 
-public sealed class PrmObjectHeadGet(FrostFsContainerId containerId, FrostFsObjectId objectId) : PrmBase, ISessionToken
+public sealed class PrmObjectHeadGet(FrostFsContainerId containerId, FrostFsObjectId objectId, CallContext? ctx = null) : PrmBase(ctx), ISessionToken
 {
     public FrostFsContainerId ContainerId { get; set; } = containerId;
 

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

@@ -2,7 +2,7 @@ using System.IO;
 
 namespace FrostFS.SDK.ClientV2;
 
-public sealed class PrmObjectPut : PrmBase, ISessionToken
+public sealed class PrmObjectPut(CallContext? ctx = null) : PrmBase(ctx), ISessionToken
 {
     /// <summary>
     /// Need to provide values like <c>ContainerId</c> and <c>ObjectType</c> to create and object.

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

@@ -2,7 +2,7 @@
 
 namespace FrostFS.SDK.ClientV2;
 
-public sealed class PrmObjectSearch(FrostFsContainerId containerId, params IObjectFilter[] filters) : PrmBase, ISessionToken
+public sealed class PrmObjectSearch(FrostFsContainerId containerId, CallContext? ctx = null, params IObjectFilter[] filters) : PrmBase(ctx), ISessionToken
 {
     /// <summary>
     /// Defines container for the search

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

@@ -1,6 +1,6 @@
 namespace FrostFS.SDK.ClientV2;
 
-public sealed class PrmSessionCreate(ulong expiration) : PrmBase
+public sealed class PrmSessionCreate(ulong expiration, CallContext? ctx = null) : PrmBase(ctx)
 {
     public ulong Expiration { get; set; } = expiration;
 }

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

@@ -1,6 +1,6 @@
 namespace FrostFS.SDK.ClientV2;
 
-public sealed class PrmSingleObjectPut(FrostFsObject frostFsObject) : PrmBase, ISessionToken
+public sealed class PrmSingleObjectPut(FrostFsObject frostFsObject, CallContext? ctx = null) : PrmBase(ctx), ISessionToken
 {
     public FrostFsObject FrostFsObject { get; set; } = frostFsObject;
 

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

@@ -27,8 +27,7 @@ public class ClientStatusMonitor : IClientStatus
         MethodIndex.methodSessionCreate,
         MethodIndex.methodAPEManagerAddChain,
         MethodIndex.methodAPEManagerRemoveChain,
-        MethodIndex.methodAPEManagerListChains,
+        MethodIndex.methodAPEManagerListChains
-        MethodIndex.methodLast
     ];
 
     public static string GetMethodName(MethodIndex index)
@@ -53,7 +52,7 @@ public class ClientStatusMonitor : IClientStatus
             MethodIndex.methodAPEManagerAddChain => "APEManagerAddChain",
             MethodIndex.methodAPEManagerRemoveChain => "APEManagerRemoveChain",
             MethodIndex.methodAPEManagerListChains => "APEManagerListChains",
-            _ => throw new NotImplementedException(),
+            _ => throw new ArgumentException("Unknown method", nameof(index)),
         };
     }
 
@@ -62,13 +61,12 @@ public class ClientStatusMonitor : IClientStatus
     private readonly ILogger? logger;
     private int healthy;
 
-    public ClientStatusMonitor(ILogger? logger, string address, uint errorThreshold)
+    public ClientStatusMonitor(ILogger? logger, string address)
     {
         this.logger = logger;
         healthy = (int)HealthyStatus.Healthy;
-        Address = address;
-        ErrorThreshold = errorThreshold;
 
+        Address = address;
         Methods = new MethodStatus[MethodIndexes.Length];
 
         for (int i = 0; i < MethodIndexes.Length; i++)
@@ -79,7 +77,7 @@ public class ClientStatusMonitor : IClientStatus
 
     public string Address { get; }
 
-    internal uint ErrorThreshold { get; }
+    internal uint ErrorThreshold { get; set; }
 
     public uint CurrentErrorCount { get; set; }
 
@@ -89,7 +87,8 @@ public class ClientStatusMonitor : IClientStatus
 
     public bool IsHealthy()
     {
-        return Interlocked.CompareExchange(ref healthy, -1, -1) == (int)HealthyStatus.Healthy;
+        var res = Interlocked.CompareExchange(ref healthy, -1, -1) == (int)HealthyStatus.Healthy;
+        return res;
     }
 
     public bool IsDialed()
@@ -124,14 +123,13 @@ public class ClientStatusMonitor : IClientStatus
             if (thresholdReached)
             {
                 SetUnhealthy();
-
                 CurrentErrorCount = 0;
             }
         }
 
-        if (thresholdReached)
+        if (thresholdReached && logger != null)
         {
-            logger?.Log(LogLevel.Warning, "Error threshold reached. Address {Address}, threshold {Threshold}", Address, ErrorThreshold);
+            FrostFsMessages.ErrorЕhresholdReached(logger, Address, ErrorThreshold);
         }
     }
 

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

@@ -1,38 +1,36 @@
-using System.Threading.Tasks;
+using System;
+using System.Threading.Tasks;
+
+using Grpc.Core;
 
 namespace FrostFS.SDK.ClientV2;
 
 // clientWrapper is used by default, alternative implementations are intended for testing purposes only.
-public class ClientWrapper
+public class ClientWrapper : ClientStatusMonitor
 {
     private readonly object _lock = new();
 
-    public ClientWrapper(WrapperPrm wrapperPrm)
+    private SessionCache sessionCache;
+
+
+    internal ClientWrapper(WrapperPrm wrapperPrm, Pool pool) : base(wrapperPrm.Logger, wrapperPrm.Address)
     {
         WrapperPrm = wrapperPrm;
-        StatusMonitor = new ClientStatusMonitor(wrapperPrm.Logger, wrapperPrm.Address, wrapperPrm.ErrorThreshold);
+        ErrorThreshold = wrapperPrm.ErrorThreshold;
 
-        try
+        sessionCache = pool.SessionCache;
-        {
+        Client = new FrostFSClient(WrapperPrm, sessionCache);
-            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())
+            if (IsHealthy())
             {
                 return Client;
             }
@@ -44,21 +42,29 @@ public class ClientWrapper
     // 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)
+    internal async Task Dial(CallContext ctx)
     {
-        var client = GetClient();
+        var client = GetClient() ?? throw new FrostFsInvalidObjectException("pool client unhealthy");
 
-        if (client == null)
+        await client.Dial(ctx).ConfigureAwait(false);
-            return "pool client unhealthy";
-
-        var result = await client.Dial(ctx).ConfigureAwait(false);
-        if (!string.IsNullOrEmpty(result))
-        {
-            StatusMonitor.SetUnhealthyOnDial();
-            return result;
     }
 
-        return null;
+    internal void HandleError(Exception ex)
+    {
+        if (ex is FrostFsResponseException responseException && responseException.Status != null)
+        {
+            switch (responseException.Status.Code)
+            {
+                case FrostFsStatusCode.Internal:
+                case FrostFsStatusCode.WrongMagicNumber:
+                case FrostFsStatusCode.SignatureVerificationFailure:
+                case FrostFsStatusCode.NodeUnderMaintenance:
+                    IncErrorRate();
+                    return;
+            }
+        }
+
+        IncErrorRate();
     }
 
     private async Task ScheduleGracefulClose()
@@ -79,31 +85,31 @@ public class ClientWrapper
 
         try
         {
-            var prmNodeInfo = new PrmNodeInfo { Context = ctx };
+            var prmNodeInfo = new PrmNodeInfo(ctx);
             var response = await Client!.GetNodeInfoAsync(prmNodeInfo).ConfigureAwait(false);
             return false;
         }
-        catch (FrostFsException)
+        catch (RpcException)
         {
             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())
+        if (IsDialed())
         {
             await ScheduleGracefulClose().ConfigureAwait(false);
         }
 
 #pragma warning disable CA2000 // Dispose objects before losing scope: will be disposed manually
-        FrostFSClient client = new(WrapperPrm);
+        FrostFSClient client = new(WrapperPrm, sessionCache);
 #pragma warning restore CA2000
 
         //TODO: set additioanl params          
         var error = await client.Dial(ctx).ConfigureAwait(false);
         if (!string.IsNullOrEmpty(error))
         {
-            StatusMonitor.SetUnhealthyOnDial();
+            SetUnhealthyOnDial();
             return wasHealthy;
         }
 
@@ -114,22 +120,22 @@ public class ClientWrapper
 
         try
         {
-            var prmNodeInfo = new PrmNodeInfo { Context = ctx };
+            var prmNodeInfo = new PrmNodeInfo(ctx);
             var res = await client.GetNodeInfoAsync(prmNodeInfo).ConfigureAwait(false);
         }
         catch (FrostFsException)
         {
-            StatusMonitor.SetUnhealthy();
+            SetUnhealthy();
             return wasHealthy;
         }
 
-        StatusMonitor.SetHealthy();
+        SetHealthy();
         return !wasHealthy;
     }
 
     internal void IncRequests(ulong elapsed, MethodIndex method)
     {
-        var methodStat = StatusMonitor.Methods[(int)method];
+        var methodStat = Methods[(int)method];
 
         methodStat.IncRequests(elapsed);
     }

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

@@ -1,16 +0,0 @@
-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/InitParameters.cs

@@ -1,6 +1,8 @@
 using System;
 using System.Security.Cryptography;
 
+using Grpc.Net.Client;
+
 using Microsoft.Extensions.Logging;
 
 namespace FrostFS.SDK.ClientV2;
@@ -24,7 +26,7 @@ public class InitParameters
 
     public NodeParam[]? NodeParams { get; set; }
 
-    public DialOptions[]? DialOptions { get; set; }
+    public GrpcChannelOptions[]? DialOptions { get; set; }
 
     public Func<string, ClientWrapper>? ClientBuilder { get; set; }
 

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

@@ -21,7 +21,7 @@ internal sealed class InnerPool
             if (Clients.Length == 1)
             {
                 var client = Clients[0];
-                if (client.StatusMonitor.IsHealthy())
+                if (client.IsHealthy())
                 {
                     return client;
                 }
@@ -34,7 +34,7 @@ internal sealed class InnerPool
                 {
                     int index = Sampler.Next();
 
-                    if (Clients[index].StatusMonitor.IsHealthy())
+                    if (Clients[index].IsHealthy())
                     {
                         return Clients[index];
                     }

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

@@ -2,7 +2,6 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Security.Cryptography;
-using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -13,6 +12,8 @@ using FrostFS.SDK.ClientV2.Interfaces;
 using FrostFS.SDK.ClientV2.Mappers.GRPC;
 using FrostFS.SDK.Cryptography;
 
+using Grpc.Core;
+
 using Microsoft.Extensions.Logging;
 
 
@@ -36,7 +37,7 @@ public partial class Pool : IFrostFSClient
 
     private ECDsa Key { get; set; }
 
-    private byte[] PublicKey { get; }
+    private string PublicKey { get; }
 
     private OwnerID? _ownerId;
     private FrostFsOwner? _owner;
@@ -65,7 +66,7 @@ public partial class Pool : IFrostFSClient
 
     internal CancellationTokenSource CancellationTokenSource { get; } = new CancellationTokenSource();
 
-    private SessionCache Cache { get; set; }
+    internal SessionCache SessionCache { get; set; }
 
     private ulong SessionTokenDuration { get; set; }
 
@@ -75,7 +76,7 @@ public partial class Pool : IFrostFSClient
 
     private bool disposedValue;
 
-    private ILogger? Logger { get; set; }
+    private ILogger? logger { get; set; }
 
     private ulong MaxObjectSize { get; set; }
 
@@ -91,20 +92,20 @@ public partial class Pool : IFrostFSClient
 
         if (options.Key == null)
         {
-            throw new FrostFsException($"Missed required parameter {nameof(options.Key)}");
+            throw new ArgumentException($"Missed required parameter {nameof(options.Key)}");
         }
 
         var nodesParams = AdjustNodeParams(options.NodeParams);
 
         var cache = new SessionCache(options.SessionExpirationDuration);
 
-        FillDefaultInitParams(options, cache);
+        FillDefaultInitParams(options, this);
 
         Key = options.Key;
-        PublicKey = Key.PublicKey();
+        PublicKey = $"{Key.PublicKey()}";
 
-        Cache = cache;
+        SessionCache = cache;
-        Logger = options.Logger;
+        logger = options.Logger;
         SessionTokenDuration = options.SessionExpirationDuration;
 
         RebalanceParams = new RebalanceParameters(
@@ -148,47 +149,54 @@ public partial class Pool : IFrostFSClient
 
             for (int j = 0; j < nodeParams.Addresses.Count; j++)
             {
-                var client = ClientBuilder(nodeParams.Addresses[j]);
+                ClientWrapper? client = null;
-                clients[j] = client;
+                bool dialed = false;
-
-                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
                 {
+                    client = clients[j] = ClientBuilder(nodeParams.Addresses[j]);
+
+                    await client.Dial(ctx).ConfigureAwait(false);
+                    dialed = true;
+
                     var token = await InitSessionForDuration(ctx, client, RebalanceParams.SessionExpirationDuration, Key, false)
                         .ConfigureAwait(false);
 
-                    var key = FormCacheKey(nodeParams.Addresses[j], Key, false);
+                    var key = FormCacheKey(nodeParams.Addresses[j], Key.PrivateKey().ToString());
-                    _ = Cache.Cache[key] = token;
+                    _ = SessionCache.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;
                 }
+                catch (RpcException ex)
+                {
+                    if (!dialed)
+                        client!.SetUnhealthyOnDial();
+                    else
+                        client!.SetUnhealthy();
+
+                    if (logger != null)
+                    {
+                        FrostFsMessages.SessionCreationError(logger, client!.WrapperPrm.Address, ex.Message);
+                    }
+                }
+                catch (FrostFsInvalidObjectException)
+                {
+                    break;
+                }
+            }
 
             var sampler = new Sampler(nodeParams.Weights.ToArray());
 
             inner[i] = new InnerPool(sampler, clients);
+
+            i++;
         }
 
         if (!atLeastOneHealthy)
-            return "at least one node must be healthy";
+            return "At least one node must be healthy";
 
         InnerPools = inner;
 
-        var res = await GetNetworkSettingsAsync(new PrmNetworkSettings { Context = ctx }).ConfigureAwait(false);
+        var res = await GetNetworkSettingsAsync(new PrmNetworkSettings(ctx)).ConfigureAwait(false);
 
         MaxObjectSize = res.MaxObjectSize;
 
@@ -252,7 +260,7 @@ public partial class Pool : IFrostFSClient
         return adjusted;
     }
 
-    private static void FillDefaultInitParams(InitParameters parameters, SessionCache cache)
+    private static void FillDefaultInitParams(InitParameters parameters, Pool pool)
     {
         if (parameters.SessionExpirationDuration == 0)
             parameters.SessionExpirationDuration = defaultSessionTokenExpirationDuration;
@@ -275,8 +283,8 @@ public partial class Pool : IFrostFSClient
         if (parameters.NodeStreamTimeout <= 0)
             parameters.NodeStreamTimeout = defaultStreamTimeout;
 
-        if (cache.TokenDuration == 0)
+        if (parameters.SessionExpirationDuration == 0)
-            cache.TokenDuration = defaultSessionTokenExpirationDuration;
+            parameters.SessionExpirationDuration = defaultSessionTokenExpirationDuration;
 
         parameters.ClientBuilder ??= new Func<string, ClientWrapper>((address) =>
             {
@@ -291,29 +299,29 @@ public partial class Pool : IFrostFSClient
                     GracefulCloseOnSwitchTimeout = parameters.GracefulCloseOnSwitchTimeout
                 };
 
-                return new ClientWrapper(wrapperPrm);
+                return new ClientWrapper(wrapperPrm, pool);
             }
         );
     }
 
-    private FrostFSClient? Сonnection()
+    private ClientWrapper Сonnection()
     {
         foreach (var pool in InnerPools!)
         {
             var client = pool.Connection();
             if (client != null)
             {
-                return client.Client;
+                return client;
             }
         }
 
-        return null;
+        throw new FrostFsException("Cannot find alive client");
     }
 
     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 networkInfo = await client!.GetNetworkSettingsAsync(new PrmNetworkSettings(ctx)).ConfigureAwait(false);
 
         var epoch = networkInfo.Epoch;
 
@@ -321,17 +329,14 @@ public partial class Pool : IFrostFSClient
             ? ulong.MaxValue
             : epoch + duration;
 
-        var prmSessionCreate = new PrmSessionCreate(exp) { Context = ctx };
+        var prmSessionCreate = new PrmSessionCreate(exp, ctx);
 
         return await client.CreateSessionAsync(prmSessionCreate).ConfigureAwait(false);
     }
 
-    private static string FormCacheKey(string address, ECDsa key, bool clientCut)
+    internal static string FormCacheKey(string address, string key)
     {
-        var k = key.PrivateKey;
+        return $"{address}{key}";
-        var stype = clientCut ? "client" : "server";
-
-        return $"{address}{stype}{k}";
     }
 
     public void Close()
@@ -343,7 +348,7 @@ public partial class Pool : IFrostFSClient
             // close all clients
             foreach (var innerPool in InnerPools)
                 foreach (var client in innerPool.Clients)
-                    if (client.StatusMonitor.IsDialed())
+                    if (client.IsDialed())
                         client.Client?.Close();
         }
     }
@@ -355,7 +360,7 @@ public partial class Pool : IFrostFSClient
 
         for (int i = 0; i < RebalanceParams.NodesParams.Length; i++)
         {
-            var parameters = this.RebalanceParams.NodesParams[i];
+            var parameters = RebalanceParams.NodesParams[i];
             buffers[i] = new double[parameters.Weights.Count];
 
             Task.Run(async () =>
@@ -405,25 +410,27 @@ public partial class Pool : IFrostFSClient
             try
             {
                 // check timeout settings
-                changed = await client.RestartIfUnhealthy(ctx).ConfigureAwait(false);
+                changed = await client!.RestartIfUnhealthy(ctx).ConfigureAwait(false);
                 healthy = true;
                 bufferWeights[j] = options.NodesParams[poolIndex].Weights[j];
             }
+            // TODO: specify
             catch (FrostFsException e)
             {
                 error = e.Message;
                 bufferWeights[j] = 0;
 
-                Cache.DeleteByPrefix(client.StatusMonitor.Address);
+                SessionCache.DeleteByPrefix(client.Address);
             }
 
             if (changed)
             {
-                StringBuilder fields = new($"address {client.StatusMonitor.Address}, healthy {healthy}");
+                if (!string.IsNullOrEmpty(error))
-                if (string.IsNullOrEmpty(error))
                 {
-                    fields.Append($", reason {error}");
+                    if (logger != null)
-                    Logger?.Log(LogLevel.Warning, "Health has changed: {Fields}", fields.ToString());
+                    {
+                        FrostFsMessages.HealthChanged(logger, client.Address, healthy, error!);
+                    }
 
                     Interlocked.Exchange(ref healthyChanged, 1);
                 }
@@ -443,6 +450,8 @@ public partial class Pool : IFrostFSClient
         }
     }
 
+
+    // TODO: remove
     private bool CheckSessionTokenErr(Exception error, string address)
     {
         if (error == null)
@@ -452,7 +461,7 @@ public partial class Pool : IFrostFSClient
 
         if (error is SessionNotFoundException || error is SessionExpiredException)
         {
-            this.Cache.DeleteByPrefix(address);
+            this.SessionCache.DeleteByPrefix(address);
             return true;
         }
 
@@ -463,14 +472,13 @@ public partial class Pool : IFrostFSClient
     {
         if (InnerPools == null)
         {
-            throw new InvalidObjectException(nameof(Pool));
+            throw new FrostFsInvalidObjectException(nameof(Pool));
         }
 
         var statistics = new Statistic();
 
         foreach (var inner in InnerPools)
         {
-            int nodeIndex = 0;
             int valueIndex = 0;
             var nodes = new string[inner.Clients.Length];
 
@@ -478,20 +486,22 @@ public partial class Pool : IFrostFSClient
             {
                 foreach (var client in inner.Clients)
                 {
-                    if (client.StatusMonitor.IsHealthy())
+                    if (client.IsHealthy())
                     {
-                        nodes[valueIndex++] = client.StatusMonitor.Address;
+                        nodes[valueIndex] = client.Address;
                     }
 
                     var node = new NodeStatistic
                     {
-                        Address = client.StatusMonitor.Address,
+                        Address = client.Address,
-                        Methods = client.StatusMonitor.MethodsStatus(),
+                        Methods = client.MethodsStatus(),
-                        OverallErrors = client.StatusMonitor.GetOverallErrorRate(),
+                        OverallErrors = client.GetOverallErrorRate(),
-                        CurrentErrors = client.StatusMonitor.GetCurrentErrorRate()
+                        CurrentErrors = client.GetCurrentErrorRate()
                     };
 
-                    statistics.Nodes[nodeIndex++] = node;
+                    statistics.Nodes.Add(node);
+
+                    valueIndex++;
 
                     statistics.OverallErrors += node.OverallErrors;
                 }
@@ -508,120 +518,234 @@ public partial class Pool : IFrostFSClient
 
     public async Task<FrostFsNetmapSnapshot> GetNetmapSnapshotAsync(PrmNetmapSnapshot? args = null)
     {
-        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        var client = Сonnection();
-        return await client.GetNetmapSnapshotAsync(args).ConfigureAwait(false);
+
+        args ??= new();
+        args.Context.PoolErrorHandler = client.HandleError;
+
+        return await client.Client!.GetNetmapSnapshotAsync(args).ConfigureAwait(false);
     }
 
     public async Task<FrostFsNodeInfo> GetNodeInfoAsync(PrmNodeInfo? args = null)
     {
-        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        var client = Сonnection();
-        return await client.GetNodeInfoAsync(args).ConfigureAwait(false);
+
+        args ??= new();
+        args.Context.PoolErrorHandler = client.HandleError;
+
+        return await client.Client!.GetNodeInfoAsync(args).ConfigureAwait(false);
     }
 
     public async Task<NetworkSettings> GetNetworkSettingsAsync(PrmNetworkSettings? args = null)
     {
-        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        var client = Сonnection();
-        return await client.GetNetworkSettingsAsync(args).ConfigureAwait(false);
+
+        args ??= new();
+        args.Context.PoolErrorHandler = client.HandleError;
+
+        return await client.Client!.GetNetworkSettingsAsync(args).ConfigureAwait(false);
     }
 
     public async Task<FrostFsSessionToken> CreateSessionAsync(PrmSessionCreate args)
     {
-        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        if (args is null)
-        return await client.CreateSessionAsync(args).ConfigureAwait(false);
+        {
+            throw new ArgumentNullException(nameof(args));
+        }
+
+        var client = Сonnection();
+
+        args.Context.PoolErrorHandler = client.HandleError;
+
+        return await client.Client!.CreateSessionAsync(args).ConfigureAwait(false);
     }
 
     public async Task<byte[]> AddChainAsync(PrmApeChainAdd args)
     {
-        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        if (args is null)
-        return await client.AddChainAsync(args).ConfigureAwait(false);
+        {
+            throw new ArgumentNullException(nameof(args));
+        }
+
+        var client = Сonnection();
+
+        args.Context.PoolErrorHandler = client.HandleError;
+
+        return await client.Client!.AddChainAsync(args).ConfigureAwait(false);
     }
 
     public async Task RemoveChainAsync(PrmApeChainRemove args)
     {
-        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        if (args is null)
-        await client.RemoveChainAsync(args).ConfigureAwait(false);
+        {
+            throw new ArgumentNullException(nameof(args));
+        }
+
+        var client = Сonnection();
+
+        args.Context.PoolErrorHandler = client.HandleError;
+
+        await client.Client!.RemoveChainAsync(args).ConfigureAwait(false);
     }
 
     public async Task<Chain[]> ListChainAsync(PrmApeChainList args)
     {
-        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        if (args is null)
-        return await client.ListChainAsync(args).ConfigureAwait(false);
+        {
+            throw new ArgumentNullException(nameof(args));
+        }
+
+        var client = Сonnection();
+
+        args.Context.PoolErrorHandler = client.HandleError;
+
+        return await client.Client!.ListChainAsync(args).ConfigureAwait(false);
     }
 
     public async Task<FrostFsContainerInfo> GetContainerAsync(PrmContainerGet args)
     {
-        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        if (args is null)
-        return await client.GetContainerAsync(args).ConfigureAwait(false);
+        {
+            throw new ArgumentNullException(nameof(args));
+        }
+
+        var client = Сonnection();
+
+        args.Context.PoolErrorHandler = client.HandleError;
+
+        return await client.Client!.GetContainerAsync(args).ConfigureAwait(false);
     }
 
     public IAsyncEnumerable<FrostFsContainerId> ListContainersAsync(PrmContainerGetAll? args = null)
     {
-        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        var client = Сonnection();
-        return client.ListContainersAsync(args);
+
+        args ??= new();
+        args.Context.PoolErrorHandler = client.HandleError;
+
+        return client.Client!.ListContainersAsync(args);
     }
 
     public async Task<FrostFsContainerId> CreateContainerAsync(PrmContainerCreate args)
     {
-        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        if (args is null)
-        return await client.CreateContainerAsync(args).ConfigureAwait(false);
+        {
+            throw new ArgumentNullException(nameof(args));
+        }
+
+        var client = Сonnection();
+
+        args.Context.PoolErrorHandler = client.HandleError;
+
+        return await client.Client!.CreateContainerAsync(args).ConfigureAwait(false);
     }
 
     public async Task DeleteContainerAsync(PrmContainerDelete args)
     {
-        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        if (args is null)
-        await client.DeleteContainerAsync(args).ConfigureAwait(false);
+        {
+            throw new ArgumentNullException(nameof(args));
+        }
+
+        var client = Сonnection();
+
+        args.Context.PoolErrorHandler = client.HandleError;
+
+        await client.Client!.DeleteContainerAsync(args).ConfigureAwait(false);
     }
 
     public async Task<FrostFsObjectHeader> GetObjectHeadAsync(PrmObjectHeadGet args)
     {
-        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        if (args is null)
-        return await client.GetObjectHeadAsync(args).ConfigureAwait(false);
+        {
+            throw new ArgumentNullException(nameof(args));
+        }
+
+        var client = Сonnection();
+
+        args.Context.PoolErrorHandler = client.HandleError;
+
+        return await client.Client!.GetObjectHeadAsync(args).ConfigureAwait(false);
     }
 
     public async Task<FrostFsObject> GetObjectAsync(PrmObjectGet args)
     {
-        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        if (args is null)
-        return await client.GetObjectAsync(args).ConfigureAwait(false);
+        {
+            throw new ArgumentNullException(nameof(args));
+        }
+
+        var client = Сonnection();
+
+        args.Context.PoolErrorHandler = client.HandleError;
+
+        return await client.Client!.GetObjectAsync(args).ConfigureAwait(false);
     }
 
     public async Task<FrostFsObjectId> PutObjectAsync(PrmObjectPut args)
     {
-        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        if (args is null)
-        return await client.PutObjectAsync(args).ConfigureAwait(false);
+        {
+            throw new ArgumentNullException(nameof(args));
+        }
+
+        var client = Сonnection();
+
+        args.Context.PoolErrorHandler = client.HandleError;
+
+        return await client.Client!.PutObjectAsync(args).ConfigureAwait(false);
     }
 
     public async Task<FrostFsObjectId> PutSingleObjectAsync(PrmSingleObjectPut args)
     {
-        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        if (args is null)
-        return await client.PutSingleObjectAsync(args).ConfigureAwait(false);
+        {
+            throw new ArgumentNullException(nameof(args));
+        }
+
+        var client = Сonnection();
+
+        args.Context.PoolErrorHandler = client.HandleError;
+
+        return await client.Client!.PutSingleObjectAsync(args).ConfigureAwait(false);
     }
 
     public async Task DeleteObjectAsync(PrmObjectDelete args)
     {
-        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        if (args is null)
-        await client.DeleteObjectAsync(args).ConfigureAwait(false);
+        {
+            throw new ArgumentNullException(nameof(args));
+        }
+
+        var client = Сonnection();
+
+        args.Context.PoolErrorHandler = client.HandleError;
+
+        await client.Client!.DeleteObjectAsync(args).ConfigureAwait(false);
     }
 
     public IAsyncEnumerable<FrostFsObjectId> SearchObjectsAsync(PrmObjectSearch args)
     {
-        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        if (args is null)
-        return client.SearchObjectsAsync(args);
+        {
+            throw new ArgumentNullException(nameof(args));
         }
 
-    public async Task<Accounting.Decimal> GetBalanceAsync(PrmBalance? args = null)
+        var client = Сonnection();
-    {
+
-        var client = Сonnection() ?? throw new FrostFsException("Cannot find alive client");
+        args.Context.PoolErrorHandler = client.HandleError;
-        return await client.GetBalanceAsync(args).ConfigureAwait(false);
+
+        return client.Client!.SearchObjectsAsync(args);
     }
 
-    public bool RestartIfUnhealthy(CallContext ctx)
+    public async Task<Accounting.Decimal> GetBalanceAsync(PrmBalance? args)
     {
-        throw new NotImplementedException();
+        var client = Сonnection();
-    }
 
-    public bool IsHealthy()
+        args ??= new();
-    {
+        args.Context.PoolErrorHandler = client.HandleError;
-        throw new NotImplementedException();
+
+        return await client.Client!.GetBalanceAsync(args).ConfigureAwait(false);
     }
 
     protected virtual void Dispose(bool disposing)

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

@@ -3,18 +3,13 @@ using System.Collections;
 
 namespace FrostFS.SDK.ClientV2;
 
-internal struct SessionCache
+internal struct SessionCache(ulong sessionExpirationDuration)
 {
-    public SessionCache(ulong sessionExpirationDuration)
-    {
-        TokenDuration = sessionExpirationDuration;
-    }
-
     internal Hashtable Cache { get; } = [];
 
     internal ulong CurrentEpoch { get; set; }
 
-    internal ulong TokenDuration { get; set; }
+    internal ulong TokenDuration { get; set; } = sessionExpirationDuration;
 
     internal void DeleteByPrefix(string prefix)
     {

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

@@ -10,7 +10,7 @@ internal sealed class AccountingServiceProvider : ContextAccessor
 
     internal AccountingServiceProvider(
         AccountingService.AccountingServiceClient? accountingServiceClient,
-        EnvironmentContext context)
+        ClientContext context)
         : base(context)
     {
         _accountingServiceClient = accountingServiceClient;

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

@@ -1,3 +1,4 @@
+using System;
 using System.Threading.Tasks;
 
 using Frostfs.V2.Ape;
@@ -9,7 +10,7 @@ internal sealed class ApeManagerServiceProvider : ContextAccessor
 {
     private readonly APEManagerService.APEManagerServiceClient? _apeManagerServiceClient;
 
-    internal ApeManagerServiceProvider(APEManagerService.APEManagerServiceClient? apeManagerServiceClient, EnvironmentContext context)
+    internal ApeManagerServiceProvider(APEManagerService.APEManagerServiceClient? apeManagerServiceClient, ClientContext context)
         : base(context)
     {
         _apeManagerServiceClient = apeManagerServiceClient;
@@ -18,10 +19,10 @@ internal sealed class ApeManagerServiceProvider : ContextAccessor
     internal async Task<byte[]> AddChainAsync(PrmApeChainAdd args)
     {
         var ctx = args.Context!;
-        ctx.Key ??= EnvironmentContext.Key?.ECDsaKey;
+        ctx.Key ??= ClientContext.Key?.ECDsaKey;
 
         if (ctx.Key == null)
-            throw new InvalidObjectException(nameof(ctx.Key));
+            throw new ArgumentNullException(nameof(args), "Key is null");
 
         AddChainRequest request = new()
         {
@@ -45,10 +46,10 @@ internal sealed class ApeManagerServiceProvider : ContextAccessor
     internal async Task RemoveChainAsync(PrmApeChainRemove args)
     {
         var ctx = args.Context!;
-        ctx.Key ??= EnvironmentContext.Key?.ECDsaKey;
+        ctx.Key ??= ClientContext.Key?.ECDsaKey;
 
         if (ctx.Key == null)
-            throw new InvalidObjectException(nameof(ctx.Key));
+            throw new ArgumentNullException(nameof(args), "Key is null");
 
         RemoveChainRequest request = new()
         {
@@ -70,10 +71,10 @@ internal sealed class ApeManagerServiceProvider : ContextAccessor
     internal async Task<Chain[]> ListChainAsync(PrmApeChainList args)
     {
         var ctx = args.Context!;
-        ctx.Key ??= EnvironmentContext.Key?.ECDsaKey;
+        ctx.Key ??= ClientContext.Key?.ECDsaKey;
 
         if (ctx.Key == null)
-            throw new InvalidObjectException(nameof(ctx.Key));
+            throw new ArgumentNullException(nameof(args), "Key is null");
 
         ListChainsRequest request = new()
         {

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

@@ -12,20 +12,28 @@ using FrostFS.Session;
 
 namespace FrostFS.SDK.ClientV2;
 
-internal sealed class ContainerServiceProvider(ContainerService.ContainerServiceClient service, EnvironmentContext envCtx) : ContextAccessor(envCtx), ISessionProvider
+internal sealed class ContainerServiceProvider(ContainerService.ContainerServiceClient service, ClientContext clientCtx) : ContextAccessor(clientCtx), ISessionProvider
 {
-    readonly SessionProvider sessions = new(envCtx);
+    private SessionProvider? sessions;
 
     public async ValueTask<SessionToken> GetOrCreateSession(ISessionToken args, CallContext ctx)
     {
+        sessions ??= new(ClientContext);
+
+        if (ClientContext.SessionCache.Cache != null &&
+            ClientContext.SessionCache.Cache.ContainsKey(ClientContext.SessionCacheKey))
+        {
+            return (SessionToken)ClientContext.SessionCache.Cache[ClientContext.SessionCacheKey];
+        }
+
         return await sessions.GetOrCreateSession(args, ctx).ConfigureAwait(false);
     }
 
     internal async Task<FrostFsContainerInfo> GetContainerAsync(PrmContainerGet args)
     {
-        GetRequest request = GetContainerRequest(args.Container.ContainerID, args.XHeaders, args.Context!);
+        GetRequest request = GetContainerRequest(args.Container.ContainerID, args.XHeaders, args.Context);
 
-        var response = await service.GetAsync(request, null, args.Context!.Deadline, args.Context.CancellationToken);
+        var response = await service.GetAsync(request, null, args.Context.Deadline, args.Context.CancellationToken);
 
         Verifier.CheckResponse(response);
 
@@ -35,13 +43,13 @@ internal sealed class ContainerServiceProvider(ContainerService.ContainerService
     internal async IAsyncEnumerable<FrostFsContainerId> ListContainersAsync(PrmContainerGetAll args)
     {
         var ctx = args.Context!;
-        ctx.OwnerId ??= EnvironmentContext.Owner;
+        ctx.OwnerId ??= ClientContext.Owner;
-        ctx.Key ??= EnvironmentContext.Key?.ECDsaKey;
+        ctx.Key ??= ClientContext.Key?.ECDsaKey;
 
         if (ctx.Key == null)
-            throw new InvalidObjectException(nameof(ctx.Key));
+            throw new ArgumentNullException(nameof(args), "Key is null");
         if (ctx.OwnerId == null)
-            throw new InvalidObjectException(nameof(ctx.OwnerId));
+            throw new ArgumentException(nameof(ctx.OwnerId));
 
         var request = new ListRequest
         {
@@ -74,11 +82,11 @@ internal sealed class ContainerServiceProvider(ContainerService.ContainerService
         grpcContainer.Version ??= ctx.Version?.ToMessage();
 
         if (ctx.Key == null)
-            throw new InvalidObjectException(nameof(ctx.Key));
+            throw new ArgumentNullException(nameof(args), "Key is null");
         if (grpcContainer.OwnerId == null)
-            throw new InvalidObjectException(nameof(grpcContainer.OwnerId));
+            throw new ArgumentException(nameof(grpcContainer.OwnerId));
         if (grpcContainer.Version == null)
-            throw new InvalidObjectException(nameof(grpcContainer.Version));
+            throw new ArgumentException(nameof(grpcContainer.Version));
 
         var request = new PutRequest
         {
@@ -114,7 +122,7 @@ internal sealed class ContainerServiceProvider(ContainerService.ContainerService
     {
         var ctx = args.Context!;
         if (ctx.Key == null)
-            throw new InvalidObjectException(nameof(ctx.Key));
+            throw new ArgumentNullException(nameof(args), "Key is null");
 
         var request = new DeleteRequest
         {
@@ -150,7 +158,7 @@ internal sealed class ContainerServiceProvider(ContainerService.ContainerService
     private static GetRequest GetContainerRequest(ContainerID id, NameValueCollection? xHeaders, CallContext ctx)
     {
         if (ctx.Key == null)
-            throw new InvalidObjectException(nameof(ctx.Key));
+            throw new ArgumentNullException(nameof(ctx), "Key is null");
 
         var request = new GetRequest
         {
@@ -207,7 +215,7 @@ internal sealed class ContainerServiceProvider(ContainerService.ContainerService
 
                 await Task.Delay(waitParams.PollInterval).ConfigureAwait(false);
             }
-            catch (ResponseException ex)
+            catch (FrostFsResponseException ex)
             {
                 if (DateTime.UtcNow >= deadLine)
                     throw new TimeoutException();

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

@@ -1,4 +1,5 @@
-using System.Linq;
+using System;
+using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 
@@ -12,7 +13,7 @@ internal sealed class NetmapServiceProvider : ContextAccessor
 {
     private readonly NetmapService.NetmapServiceClient netmapServiceClient;
 
-    internal NetmapServiceProvider(NetmapService.NetmapServiceClient netmapServiceClient, EnvironmentContext context)
+    internal NetmapServiceProvider(NetmapService.NetmapServiceClient netmapServiceClient, ClientContext context)
         : base(context)
     {
         this.netmapServiceClient = netmapServiceClient;
@@ -20,8 +21,8 @@ internal sealed class NetmapServiceProvider : ContextAccessor
 
     internal async Task<NetworkSettings> GetNetworkSettingsAsync(CallContext ctx)
     {
-        if (EnvironmentContext.NetworkSettings != null)
+        if (ClientContext.NetworkSettings != null)
-            return EnvironmentContext.NetworkSettings;
+            return ClientContext.NetworkSettings;
 
         var response = await GetNetworkInfoAsync(ctx).ConfigureAwait(false);
 
@@ -38,7 +39,7 @@ internal sealed class NetmapServiceProvider : ContextAccessor
             SetNetworksParam(param, settings);
         }
 
-        EnvironmentContext.NetworkSettings = settings;
+        ClientContext.NetworkSettings = settings;
 
         return settings;
     }
@@ -46,10 +47,10 @@ internal sealed class NetmapServiceProvider : ContextAccessor
     internal async Task<FrostFsNodeInfo> GetLocalNodeInfoAsync(PrmNodeInfo args)
     {
         var ctx = args.Context!;
-        ctx.Key ??= EnvironmentContext.Key?.ECDsaKey;
+        ctx.Key ??= ClientContext.Key?.ECDsaKey;
 
         if (ctx.Key == null)
-            throw new InvalidObjectException(nameof(ctx.Key));
+            throw new ArgumentNullException(nameof(args), "Key is null");
 
         var request = new LocalNodeInfoRequest
         {
@@ -59,8 +60,6 @@ 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);
@@ -70,10 +69,10 @@ internal sealed class NetmapServiceProvider : ContextAccessor
 
     internal async Task<NetworkInfoResponse> GetNetworkInfoAsync(CallContext ctx)
     {
-        ctx.Key ??= EnvironmentContext.Key?.ECDsaKey;
+        ctx.Key ??= ClientContext.Key?.ECDsaKey;
 
         if (ctx.Key == null)
-            throw new InvalidObjectException(nameof(ctx.Key));
+            throw new ArgumentNullException(nameof(ctx), "Key is null");
 
         var request = new NetworkInfoRequest();
 
@@ -91,10 +90,10 @@ internal sealed class NetmapServiceProvider : ContextAccessor
     internal async Task<FrostFsNetmapSnapshot> GetNetmapSnapshotAsync(PrmNetmapSnapshot args)
     {
         var ctx = args.Context!;
-        ctx.Key ??= EnvironmentContext.Key?.ECDsaKey;
+        ctx.Key ??= ClientContext.Key?.ECDsaKey;
 
         if (ctx.Key == null)
-            throw new InvalidObjectException(nameof(ctx.Key));
+            throw new ArgumentNullException(nameof(args), "Key is null");
 
         var request = new NetmapSnapshotRequest();
 

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

@@ -15,30 +15,32 @@ using Google.Protobuf;
 
 namespace FrostFS.SDK.ClientV2;
 
-internal sealed class ObjectServiceProvider : ContextAccessor, ISessionProvider
+internal sealed class ObjectServiceProvider(ObjectService.ObjectServiceClient client, ClientContext clientCtx)
+    : ContextAccessor(clientCtx), ISessionProvider
 {
-    private readonly SessionProvider sessions;
+    private SessionProvider? sessions;
-    private ObjectService.ObjectServiceClient client;
+    private readonly ObjectService.ObjectServiceClient client = client;
-
-    internal ObjectServiceProvider(ObjectService.ObjectServiceClient client, EnvironmentContext env)
-        : base(env)
-    {
-        this.sessions = new(EnvironmentContext);
-        this.client = client;
-    }
 
     public async ValueTask<SessionToken> GetOrCreateSession(ISessionToken args, CallContext ctx)
     {
+        sessions ??= new(ClientContext);
+
+        if (ClientContext.SessionCache.Cache != null &&
+            ClientContext.SessionCache.Cache.ContainsKey(ClientContext.SessionCacheKey))
+        {
+            return (SessionToken)ClientContext.SessionCache.Cache[ClientContext.SessionCacheKey];
+        }
+
         return await sessions.GetOrCreateSession(args, ctx).ConfigureAwait(false);
     }
 
     internal async Task<FrostFsObjectHeader> GetObjectHeadAsync(PrmObjectHeadGet args)
     {
         var ctx = args.Context!;
-        ctx.Key ??= EnvironmentContext.Key?.ECDsaKey;
+        ctx.Key ??= ClientContext.Key?.ECDsaKey;
 
         if (ctx.Key == null)
-            throw new InvalidObjectException(nameof(ctx.Key));
+            throw new ArgumentNullException(nameof(args), "Key is null");
 
         var request = new HeadRequest
         {
@@ -74,10 +76,10 @@ internal sealed class ObjectServiceProvider : ContextAccessor, ISessionProvider
     {
         var ctx = args.Context!;
 
-        ctx.Key ??= EnvironmentContext.Key?.ECDsaKey;
+        ctx.Key ??= ClientContext.Key?.ECDsaKey;
 
         if (ctx.Key == null)
-            throw new InvalidObjectException(nameof(ctx.Key));
+            throw new ArgumentNullException(nameof(args), "Key is null");
 
         var request = new GetRequest
         {
@@ -108,10 +110,10 @@ internal sealed class ObjectServiceProvider : ContextAccessor, ISessionProvider
     internal async Task DeleteObjectAsync(PrmObjectDelete args)
     {
         var ctx = args.Context!;
-        ctx.Key ??= EnvironmentContext.Key?.ECDsaKey;
+        ctx.Key ??= ClientContext.Key?.ECDsaKey;
 
         if (ctx.Key == null)
-            throw new InvalidObjectException(nameof(ctx.Key));
+            throw new ArgumentNullException(nameof(args), "Key is null");
 
         var request = new DeleteRequest
         {
@@ -145,7 +147,7 @@ internal sealed class ObjectServiceProvider : ContextAccessor, ISessionProvider
         var ctx = args.Context!;
 
         if (ctx.Key == null)
-            throw new InvalidObjectException(nameof(ctx.Key));
+            throw new ArgumentNullException(nameof(args), "Key is null");
 
         var request = new SearchRequest
         {
@@ -183,10 +185,10 @@ internal sealed class ObjectServiceProvider : ContextAccessor, ISessionProvider
             throw new ArgumentNullException(nameof(args));
 
         if (args.Header == null)
-            throw new ArgumentException(nameof(args.Header));
+            throw new ArgumentNullException(nameof(args), "Header is null");
 
         if (args.Payload == null)
-            throw new ArgumentException(nameof(args.Payload));
+            throw new ArgumentNullException(nameof(args), "Payload is null");
 
         if (args.ClientCut)
             return await PutClientCutObject(args).ConfigureAwait(false);
@@ -206,7 +208,7 @@ internal sealed class ObjectServiceProvider : ContextAccessor, ISessionProvider
         var ctx = args.Context!;
 
         if (ctx.Key == null)
-            throw new InvalidObjectException(nameof(ctx.Key));
+            throw new ArgumentNullException(nameof(args), "Key is null");
 
         var grpcObject = ObjectTools.CreateObject(args.FrostFsObject, ctx);
 
@@ -254,7 +256,7 @@ internal sealed class ObjectServiceProvider : ContextAccessor, ISessionProvider
 
         if (args.MaxObjectSizeCache == 0)
         {
-            var networkSettings = await EnvironmentContext.Client.GetNetworkSettingsAsync(new PrmNetworkSettings() { Context = ctx })
+            var networkSettings = await ClientContext.Client.GetNetworkSettingsAsync(new PrmNetworkSettings(ctx))
                 .ConfigureAwait(false);
 
             args.MaxObjectSizeCache = (int)networkSettings.MaxObjectSize;
@@ -306,7 +308,7 @@ internal sealed class ObjectServiceProvider : ContextAccessor, ISessionProvider
 
             var linkObject = new FrostFsLinkObject(header.ContainerId, split!.SplitId, largeObjectHeader, sentObjectIds);
 
-            _ = await PutSingleObjectAsync(new PrmSingleObjectPut(linkObject) { Context = args.Context }).ConfigureAwait(false);
+            _ = await PutSingleObjectAsync(new PrmSingleObjectPut(linkObject, args.Context)).ConfigureAwait(false);
 
             var parentHeader = args.Header.GetHeader();
 
@@ -331,7 +333,7 @@ internal sealed class ObjectServiceProvider : ContextAccessor, ISessionProvider
     {
         var ctx = args.Context!;
         if (ctx.Key == null)
-            throw new InvalidObjectException(nameof(ctx.Key));
+            throw new ArgumentNullException(nameof(args), "Key is null");
 
         var payload = args.Payload!;
 
@@ -352,7 +354,7 @@ internal sealed class ObjectServiceProvider : ContextAccessor, ISessionProvider
             }
             else
             {
-                chunkBuffer = EnvironmentContext.GetArrayPool(Constants.ObjectChunkSize).Rent(chunkSize);
+                chunkBuffer = ClientContext.GetArrayPool(Constants.ObjectChunkSize).Rent(chunkSize);
                 isRentBuffer = true;
             }
 
@@ -409,7 +411,7 @@ internal sealed class ObjectServiceProvider : ContextAccessor, ISessionProvider
         var header = args.Header!;
 
         if (ctx.Key == null)
-            throw new InvalidObjectException(nameof(ctx.Key));
+            throw new ArgumentNullException(nameof(args), "Key is null");
 
         header.OwnerId ??= ctx.OwnerId;
         header.Version ??= ctx.Version;

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, EnvironmentContext context)
+    internal SessionServiceProvider(SessionService.SessionServiceClient? sessionServiceClient, ClientContext context)
         : base(context)
     {
         _sessionServiceClient = sessionServiceClient;
@@ -20,7 +20,7 @@ internal sealed class SessionServiceProvider : ContextAccessor
     {
         var ctx = args.Context!;
 
-        ctx.OwnerId ??= EnvironmentContext.Owner;
+        ctx.OwnerId ??= ClientContext.Owner;
 
         var request = new CreateRequest
         {

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

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

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

@@ -7,14 +7,13 @@ internal interface ISessionProvider
     ValueTask<Session.SessionToken> GetOrCreateSession(ISessionToken args, CallContext ctx);
 }
 
-internal sealed class SessionProvider(EnvironmentContext envCtx)
+internal sealed class SessionProvider(ClientContext envCtx)
 {
-    // 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 envCtx.Client.CreateSessionInternalAsync(new PrmSessionCreate(uint.MaxValue) { Context = ctx })
+            return await envCtx.Client.CreateSessionInternalAsync(new PrmSessionCreate(uint.MaxValue, ctx))
                 .ConfigureAwait(false);
         }
 

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

@@ -2,16 +2,21 @@ using System;
 using System.Buffers;
 using System.Security.Cryptography;
 
+using FrostFS.SDK.Cryptography;
+
 using Grpc.Net.Client;
 
 namespace FrostFS.SDK.ClientV2;
 
-public class EnvironmentContext(FrostFSClient client, ECDsa? key, FrostFsOwner? owner, GrpcChannel channel, FrostFsVersion version) : IDisposable
+public class ClientContext(FrostFSClient client, ECDsa? key, FrostFsOwner? owner, GrpcChannel channel, FrostFsVersion version) : IDisposable
 {
     private ArrayPool<byte>? _arrayPool;
+    private string? sessionKey;
 
     internal FrostFsOwner? Owner { get; } = owner;
 
+    internal string? Address { get; } = channel.Target;
+
     internal GrpcChannel Channel { get; private set; } = channel;
 
     internal FrostFsVersion Version { get; } = version;
@@ -22,6 +27,21 @@ public class EnvironmentContext(FrostFSClient client, ECDsa? key, FrostFsOwner?
 
     internal ClientKey? Key { get; } = key != null ? new ClientKey(key) : null;
 
+    internal SessionCache SessionCache { get; set; }
+
+    internal string? SessionCacheKey
+    {
+        get
+        {
+            if (sessionKey == null && Key != null && Address != null)
+            {
+                sessionKey = Pool.FormCacheKey(Address, Key.ECDsaKey.PrivateKey().ToString());
+            }
+
+            return sessionKey;
+        }
+    }
+
     /// <summary>
     /// Custom pool is used for predefined sizes of buffers like grpc chunk 
     /// </summary>

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

@@ -17,13 +17,13 @@ public sealed class ObjectReader(AsyncServerStreamingCall<GetResponse> call) : I
     internal async Task<Object.Object> ReadHeader()
     {
         if (!await Call.ResponseStream.MoveNext().ConfigureAwait(false))
-            throw new InvalidOperationException("unexpected end of stream");
+            throw new FrostFsStreamException("unexpected end of stream");
 
         var response = Call.ResponseStream.Current;
         Verifier.CheckResponse(response);
 
         if (response.Body.ObjectPartCase != GetResponse.Types.Body.ObjectPartOneofCase.Init)
-            throw new InvalidOperationException("unexpected message type");
+            throw new FrostFsStreamException("unexpected message type");
 
         return new Object.Object
         {
@@ -41,7 +41,7 @@ public sealed class ObjectReader(AsyncServerStreamingCall<GetResponse> call) : I
         Verifier.CheckResponse(response);
 
         if (response.Body.ObjectPartCase != GetResponse.Types.Body.ObjectPartOneofCase.Chunk)
-            throw new InvalidOperationException("unexpected message type");
+            throw new FrostFsStreamException("unexpected message type");
 
         return response.Body.Chunk.Memory;
     }

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

@@ -59,7 +59,7 @@ internal static class ObjectTools
             return;
 
         if (ctx.Key == null)
-            throw new InvalidObjectException(nameof(ctx.Key));
+            throw new FrostFsInvalidObjectException(nameof(ctx.Key));
 
         grpcHeader.Split = new Header.Types.Split
         {

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

@@ -122,7 +122,7 @@ public static class Verifier
         var status = resp.MetaHeader.Status.ToModel();
 
         if (status != null && !status.IsSuccess)
-            throw new ResponseException(status);
+            throw new FrostFsResponseException(status);
     }
 
     /// <summary>
@@ -137,6 +137,6 @@ public static class Verifier
         }
 
         if (!request.Verify())
-            throw new FormatException($"invalid response, type={request.GetType()}");
+            throw new FrostFsResponseException($"invalid response, type={request.GetType()}");
     }
 }

src/FrostFS.SDK.Tests/CallbackInterceptor.cs

@@ -0,0 +1,33 @@
+using Grpc.Core;
+using Grpc.Core.Interceptors;
+
+namespace FrostFS.SDK.SmokeTests;
+
+[System.Diagnostics.CodeAnalysis.SuppressMessage("Design", "CA1062:Validate arguments of public methods",
+        Justification = "parameters are provided by GRPC infrastructure")]
+public class CallbackInterceptor(Action<string>? callback = null) : Interceptor
+{
+    public override AsyncUnaryCall<TResponse> AsyncUnaryCall<TRequest, TResponse>(
+        TRequest request,
+        ClientInterceptorContext<TRequest, TResponse> context,
+        AsyncUnaryCallContinuation<TRequest, TResponse> continuation)
+    {
+        var call = continuation(request, context);
+
+        return new AsyncUnaryCall<TResponse>(
+            HandleUnaryResponse(call),
+            call.ResponseHeadersAsync,
+            call.GetStatus,
+            call.GetTrailers,
+            call.Dispose);
+    }
+
+    private async Task<TResponse> HandleUnaryResponse<TResponse>(AsyncUnaryCall<TResponse> call)
+    {
+        var response = await call;
+
+        callback?.Invoke($"elapsed");
+
+        return response;
+    }
+}

src/FrostFS.SDK.Tests/MetricsInterceptor.cs

@@ -1,41 +0,0 @@
-using System.Diagnostics;
-
-using Grpc.Core;
-using Grpc.Core.Interceptors;
-
-namespace FrostFS.SDK.SmokeTests;
-
-public class MetricsInterceptor() : Interceptor
-{
-    public override AsyncUnaryCall<TResponse> AsyncUnaryCall<TRequest, TResponse>(
-        TRequest request,
-        ClientInterceptorContext<TRequest, TResponse> context,
-        AsyncUnaryCallContinuation<TRequest, TResponse> continuation)
-    {
-        ArgumentNullException.ThrowIfNull(continuation);
-
-        using var call = continuation(request, context);
-
-        return new AsyncUnaryCall<TResponse>(
-            HandleUnaryResponse(call),
-            call.ResponseHeadersAsync,
-            call.GetStatus,
-            call.GetTrailers,
-            call.Dispose);
-    }
-
-    private static async Task<TResponse> HandleUnaryResponse<TResponse>(AsyncUnaryCall<TResponse> call)
-    {
-        var watch = new Stopwatch();
-        watch.Start();
-
-        var response = await call.ResponseAsync.ConfigureAwait(false);
-
-        watch.Stop();
-
-        // Do something with call info
-        // var elapsed = watch.ElapsedTicks * 1_000_000/Stopwatch.Frequency;
-
-        return response;
-    }
-}

src/FrostFS.SDK.Tests/NetworkTest.cs

@@ -28,19 +28,16 @@ public class NetworkTest : NetworkTestsBase
         Mocker.Parameters.Add("HomomorphicHashingDisabled", [1]);
         Mocker.Parameters.Add("MaintenanceModeAllowed", [1]);
 
-        var param = new PrmNetworkSettings();
+        var param = useContext ?
-
+            new PrmNetworkSettings(new CallContext
-        if (useContext)
-        {
-            param.Context = new CallContext
             {
                 CancellationToken = Mocker.CancellationTokenSource.Token,
                 Timeout = TimeSpan.FromSeconds(20),
                 OwnerId = OwnerId,
                 Key = ECDsaKey,
                 Version = Version
-            };
+            })
-        }
+            : new PrmNetworkSettings();
 
         var validTimeoutFrom = DateTime.UtcNow.AddSeconds(20);
 
@@ -116,12 +113,11 @@ public class NetworkTest : NetworkTestsBase
 
         Mocker.NetmapSnapshotResponse = new NetmapSnapshotResponse { Body = body };
 
-        var param = new PrmNetmapSnapshot();
+        PrmNetmapSnapshot param;
 
         if (useContext)
         {
-            param.XHeaders.Add("headerKey1", "headerValue1");
+            var ctx = new CallContext
-            param.Context = new CallContext
             {
                 CancellationToken = Mocker.CancellationTokenSource.Token,
                 Timeout = TimeSpan.FromSeconds(20),
@@ -129,6 +125,14 @@ public class NetworkTest : NetworkTestsBase
                 Key = ECDsaKey,
                 Version = Version
             };
+
+            param = new(ctx);
+            param.XHeaders.Add("headerKey1", "headerValue1");
+
+        }
+        else
+        {
+            param = new();
         }
 
         var validTimeoutFrom = DateTime.UtcNow.AddSeconds(20);
@@ -208,12 +212,11 @@ public class NetworkTest : NetworkTestsBase
 
         Mocker.NodeInfoResponse = new LocalNodeInfoResponse { Body = body };
 
-        var param = new PrmNodeInfo();
+        PrmNodeInfo param;
 
         if (useContext)
         {
-            param.XHeaders.Add("headerKey1", "headerValue1");
+            var ctx = new CallContext
-            param.Context = new CallContext
             {
                 CancellationToken = Mocker.CancellationTokenSource.Token,
                 Timeout = TimeSpan.FromSeconds(20),
@@ -221,6 +224,14 @@ public class NetworkTest : NetworkTestsBase
                 Key = ECDsaKey,
                 Version = Version
             };
+
+            param = new(ctx);
+            param.XHeaders.Add("headerKey1", "headerValue1");
+
+        }
+        else
+        {
+            param = new();
         }
 
         var validTimeoutFrom = DateTime.UtcNow.AddSeconds(20);

src/FrostFS.SDK.Tests/ObjectTest.cs

@@ -32,7 +32,7 @@ public class ObjectTest : ObjectTestsBase
 
         var objectId = client.CalculateObjectId(Mocker.ObjectHeader!, ctx);
 
-        var result = await client.GetObjectAsync(new PrmObjectGet(ContainerId, objectId) { Context = ctx });
+        var result = await client.GetObjectAsync(new PrmObjectGet(ContainerId, objectId, ctx));
 
         Assert.NotNull(result);
 
@@ -50,7 +50,7 @@ public class ObjectTest : ObjectTestsBase
     [Fact]
     public async void PutObjectTest()
     {
-        Mocker.ResultObjectIds.Add(SHA256.HashData([]));
+        Mocker.ResultObjectIds!.Add(SHA256.HashData([]));
 
         Random rnd = new();
         var bytes = new byte[1024];
@@ -107,7 +107,7 @@ public class ObjectTest : ObjectTestsBase
         rnd.NextBytes(objIds.ElementAt(2));
 
         foreach (var objId in objIds)
-            Mocker.ResultObjectIds.Add(objId);
+            Mocker.ResultObjectIds!.Add(objId);
 
         var result = await GetClient().PutObjectAsync(param);
 

src/FrostFS.SDK.Tests/PoolSmokeTests.cs

@@ -23,16 +23,6 @@ public class PoolSmokeTests : SmokeTestsBase
             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
@@ -85,6 +75,44 @@ public class PoolSmokeTests : SmokeTestsBase
         Assert.Equal(9, result.Attributes.Count);
     }
 
+    [Fact]
+    public async void NodeInfoStatisticsTwoNodesTest()
+    {
+        var options = new InitParameters
+        {
+            Key = keyString.LoadWif(),
+            NodeParams = [
+                new(1, this.url, 100.0f),
+                new(2, this.url.Replace('0', '1'), 100.0f)
+                ],
+            ClientBuilder = null,
+            GracefulCloseOnSwitchTimeout = 30_000_000,
+            Logger = null
+        };
+
+        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();
+
+        var statistics = pool.Statistic();
+
+        Assert.False(string.IsNullOrEmpty(callbackText));
+        Assert.Contains(" took ", callbackText, StringComparison.Ordinal);
+    }
+
     [Fact]
     public async void NodeInfoStatisticsTest()
     {
@@ -308,31 +336,29 @@ public class PoolSmokeTests : SmokeTestsBase
         };
 
         var createContainerParam = new PrmContainerCreate(
-            new FrostFsContainerInfo(new FrostFsPlacementPolicy(true, new FrostFsReplica(1)), [new("testKey", "testValue")]))
+            new FrostFsContainerInfo(new FrostFsPlacementPolicy(true, new FrostFsReplica(1)), [new("testKey", "testValue")]), ctx);
-        {
-            Context = ctx
-        };
 
         var createdContainer = await pool.CreateContainerAsync(createContainerParam);
 
-        var container = await pool.GetContainerAsync(new PrmContainerGet(createdContainer) { Context = ctx });
+        var container = await pool.GetContainerAsync(new PrmContainerGet(createdContainer));
         Assert.NotNull(container);
         Assert.True(callbackInvoked);
 
         var bytes = GetRandomBytes(objectSize);
 
-        var param = new PrmObjectPut
+        var ctx1 = new CallContext
+        {
+            Callback = new((CallStatistics cs) => Assert.True(cs.ElapsedMicroSeconds > 0))
+        };
+
+        var param = new PrmObjectPut(ctx1)
         {
             Header = new FrostFsObjectHeader(
                 containerId: createdContainer,
                 type: FrostFsObjectType.Regular,
                 [new FrostFsAttributePair("fileName", "test")]),
             Payload = new MemoryStream(bytes),
-            ClientCut = false,
+            ClientCut = false
-            Context = new CallContext
-            {
-                Callback = new((CallStatistics cs) => Assert.True(cs.ElapsedMicroSeconds > 0))
-            }
         };
 
         var objectId = await pool.PutObjectAsync(param);
@@ -400,19 +426,16 @@ public class PoolSmokeTests : SmokeTestsBase
         };
 
         var createContainerParam = new PrmContainerCreate(
-            new FrostFsContainerInfo(new FrostFsPlacementPolicy(true, new FrostFsReplica(1))))
+            new FrostFsContainerInfo(new FrostFsPlacementPolicy(true, new FrostFsReplica(1))), ctx);
-        {
-            Context = ctx
-        };
 
         var container = await pool.CreateContainerAsync(createContainerParam);
 
-        var containerInfo = await pool.GetContainerAsync(new PrmContainerGet(container) { Context = ctx });
+        var containerInfo = await pool.GetContainerAsync(new PrmContainerGet(container, ctx));
         Assert.NotNull(containerInfo);
 
         var bytes = GetRandomBytes(objectSize);
 
-        var param = new PrmObjectPut
+        var param = new PrmObjectPut(new CallContext { Callback = new((CallStatistics cs) => Assert.True(cs.ElapsedMicroSeconds > 0)) })
         {
             Header = new FrostFsObjectHeader(
                 containerId: container,
@@ -420,10 +443,6 @@ public class PoolSmokeTests : SmokeTestsBase
                 [new FrostFsAttributePair("fileName", "test")]),
             Payload = new MemoryStream(bytes),
             ClientCut = false,
-            Context = new CallContext
-            {
-                Callback = new((CallStatistics cs) => Assert.True(cs.ElapsedMicroSeconds > 0))
-            },
             SessionToken = token
         };
 
@@ -496,10 +515,11 @@ public class PoolSmokeTests : SmokeTestsBase
         var ctx = new CallContext
         {
             Timeout = TimeSpan.FromSeconds(10),
-            Interceptors = new([new MetricsInterceptor()])
         };
 
-        var container = await pool.GetContainerAsync(new PrmContainerGet(containerId) { Context = ctx });
+        ctx.Interceptors.Add(new CallbackInterceptor());
+
+        var container = await pool.GetContainerAsync(new PrmContainerGet(containerId, ctx));
 
         Assert.NotNull(container);
 
@@ -520,7 +540,7 @@ public class PoolSmokeTests : SmokeTestsBase
         var filter = new FilterByAttributePair(FrostFsMatchType.Equals, "fileName", "test");
 
         bool hasObject = false;
-        await foreach (var objId in pool.SearchObjectsAsync(new PrmObjectSearch(containerId, filter)))
+        await foreach (var objId in pool.SearchObjectsAsync(new PrmObjectSearch(containerId, null, filter)))
         {
             hasObject = true;
 
@@ -551,21 +571,10 @@ public class PoolSmokeTests : SmokeTestsBase
 
         await Cleanup(pool);
 
-        var deadline = DateTime.UtcNow.Add(TimeSpan.FromSeconds(5));
+        await foreach (var cid in pool.ListContainersAsync())
-
-        IAsyncEnumerator<FrostFsContainerId>? enumerator = null;
-        do
         {
-            if (deadline <= DateTime.UtcNow)
+            Assert.Fail($"Container {cid.GetValue()} exist");
-            {
-                Assert.Fail("Containers exist");
-                break;
         }
-
-            enumerator = pool.ListContainersAsync().GetAsyncEnumerator();
-            await Task.Delay(500);
-        }
-        while (await enumerator!.MoveNextAsync());
     }
 
     private static byte[] GetRandomBytes(int size)

src/FrostFS.SDK.Tests/SessionTests.cs

@@ -14,12 +14,11 @@ public class SessionTest : SessionTestsBase
     public async void CreateSessionTest(bool useContext)
     {
         var exp = 100u;
-        var param = new PrmSessionCreate(exp);
+        PrmSessionCreate param;
 
         if (useContext)
         {
-            param.XHeaders.Add("headerKey1", "headerValue1");
+            var ctx = new CallContext
-            param.Context = new CallContext
             {
                 CancellationToken = Mocker.CancellationTokenSource.Token,
                 Timeout = TimeSpan.FromSeconds(20),
@@ -27,6 +26,14 @@ public class SessionTest : SessionTestsBase
                 Key = ECDsaKey,
                 Version = Mocker.Version
             };
+
+            param = new PrmSessionCreate(exp, ctx);
+
+            param.XHeaders.Add("headerKey1", "headerValue1");
+        }
+        else
+        {
+            param = new PrmSessionCreate(exp);
         }
 
         var validTimeoutFrom = DateTime.UtcNow.AddSeconds(20);

src/FrostFS.SDK.Tests/SmokeClientTests.cs

@@ -26,7 +26,7 @@ public class SmokeClientTests : SmokeTestsBase
             ? FrostFSClient.GetSingleOwnerInstance(GetSingleOwnerOptions(this.keyString, this.url))
             : FrostFSClient.GetInstance(GetOptions(this.url));
 
-        PrmBalance? prm = isSingleOnwerClient ? default : new() { Context = Ctx };
+        PrmBalance? prm = isSingleOnwerClient ? default : new(Ctx);
 
         var result = await client.GetBalanceAsync(prm);
     }
@@ -38,7 +38,7 @@ public class SmokeClientTests : SmokeTestsBase
     {
         using var client = isSingleOnwerClient ? FrostFSClient.GetSingleOwnerInstance(GetSingleOwnerOptions(this.keyString, this.url)) : FrostFSClient.GetInstance(GetOptions(this.url));
 
-        PrmNetmapSnapshot? prm = isSingleOnwerClient ? default : new() { Context = Ctx };
+        PrmNetmapSnapshot? prm = isSingleOnwerClient ? default : new(Ctx);
         var result = await client.GetNetmapSnapshotAsync(prm);
 
         Assert.True(result.Epoch > 0);
@@ -59,9 +59,11 @@ public class SmokeClientTests : SmokeTestsBase
     [InlineData(true)]
     public async void NodeInfoTest(bool isSingleOnwerClient)
     {
-        using var client = isSingleOnwerClient ? FrostFSClient.GetSingleOwnerInstance(GetSingleOwnerOptions(this.keyString, 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 };
+        PrmNodeInfo? prm = isSingleOnwerClient ? default : new(Ctx);
 
         var result = await client.GetNodeInfoAsync(prm);
 
@@ -93,7 +95,7 @@ public class SmokeClientTests : SmokeTestsBase
     {
         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 };
+        PrmSessionCreate? prm = isSingleOnwerClient ? new PrmSessionCreate(100) : new PrmSessionCreate(100, Ctx);
 
         var token = await client.CreateSessionAsync(prm);
 
@@ -262,31 +264,27 @@ public class SmokeClientTests : SmokeTestsBase
         };
 
         var createContainerParam = new PrmContainerCreate(
-            new FrostFsContainerInfo(new FrostFsPlacementPolicy(true, new FrostFsReplica(1)), [new("testKey", "testValue")]))
+            new FrostFsContainerInfo(new FrostFsPlacementPolicy(true, new FrostFsReplica(1)), [new("testKey", "testValue")]), ctx);
-        {
-            Context = ctx
-        };
 
         var createdContainer = await client.CreateContainerAsync(createContainerParam);
 
-        var container = await client.GetContainerAsync(new PrmContainerGet(createdContainer) { Context = ctx });
+        var container = await client.GetContainerAsync(new PrmContainerGet(createdContainer, ctx));
         Assert.NotNull(container);
         Assert.True(callbackInvoked);
 
         var bytes = GetRandomBytes(objectSize);
 
-        var param = new PrmObjectPut
+        var param = new PrmObjectPut(new CallContext
+        {
+            Callback = new((CallStatistics cs) => Assert.True(cs.ElapsedMicroSeconds > 0))
+        })
         {
             Header = new FrostFsObjectHeader(
                 containerId: createdContainer,
                 type: FrostFsObjectType.Regular,
                 [new FrostFsAttributePair("fileName", "test")]),
             Payload = new MemoryStream(bytes),
-            ClientCut = false,
+            ClientCut = false
-            Context = new CallContext
-            {
-                Callback = new((CallStatistics cs) => Assert.True(cs.ElapsedMicroSeconds > 0))
-            }
         };
 
         var objectId = await client.PutObjectAsync(param);
@@ -348,19 +346,19 @@ public class SmokeClientTests : SmokeTestsBase
         };
 
         var createContainerParam = new PrmContainerCreate(
-            new FrostFsContainerInfo(new FrostFsPlacementPolicy(true, new FrostFsReplica(1))))
+            new FrostFsContainerInfo(new FrostFsPlacementPolicy(true, new FrostFsReplica(1))), ctx);
-        {
-            Context = ctx
-        };
 
         var container = await client.CreateContainerAsync(createContainerParam);
 
-        var containerInfo = await client.GetContainerAsync(new PrmContainerGet(container) { Context = ctx });
+        var containerInfo = await client.GetContainerAsync(new PrmContainerGet(container, ctx));
         Assert.NotNull(containerInfo);
 
         var bytes = GetRandomBytes(objectSize);
 
-        var param = new PrmObjectPut
+        var param = new PrmObjectPut(new CallContext
+        {
+            Callback = new((CallStatistics cs) => Assert.True(cs.ElapsedMicroSeconds > 0))
+        })
         {
             Header = new FrostFsObjectHeader(
                 containerId: container,
@@ -368,10 +366,6 @@ public class SmokeClientTests : SmokeTestsBase
                 [new FrostFsAttributePair("fileName", "test")]),
             Payload = new MemoryStream(bytes),
             ClientCut = false,
-            Context = new CallContext
-            {
-                Callback = new((CallStatistics cs) => Assert.True(cs.ElapsedMicroSeconds > 0))
-            },
             SessionToken = token
         };
 
@@ -437,11 +431,12 @@ public class SmokeClientTests : SmokeTestsBase
 
         var ctx = new CallContext
         {
-            Timeout = TimeSpan.FromSeconds(10),
+            Timeout = TimeSpan.FromSeconds(10)
-            Interceptors = new([new MetricsInterceptor()])
         };
 
-        var container = await client.GetContainerAsync(new PrmContainerGet(containerId) { Context = ctx });
+        ctx.Interceptors.Add(new CallbackInterceptor());
+
+        var container = await client.GetContainerAsync(new PrmContainerGet(containerId, ctx));
 
         Assert.NotNull(container);
 
@@ -462,7 +457,7 @@ public class SmokeClientTests : SmokeTestsBase
         var filter = new FilterByAttributePair(FrostFsMatchType.Equals, "fileName", "test");
 
         bool hasObject = false;
-        await foreach (var objId in client.SearchObjectsAsync(new PrmObjectSearch(containerId, filter)))
+        await foreach (var objId in client.SearchObjectsAsync(new PrmObjectSearch(containerId, null, filter)))
         {
             hasObject = true;
 
@@ -510,6 +505,38 @@ public class SmokeClientTests : SmokeTestsBase
         while (await enumerator!.MoveNextAsync());
     }
 
+    [Fact]
+    public async void NodeInfoCallbackAndInterceptorTest()
+    {
+        using var client = FrostFSClient.GetSingleOwnerInstance(GetSingleOwnerOptions(this.keyString, this.url));
+
+        bool callbackInvoked = false;
+        bool intercepterInvoked = false;
+
+        var ctx = new CallContext
+        {
+            Callback = new((CallStatistics cs) =>
+            {
+                callbackInvoked = true;
+                Assert.True(cs.ElapsedMicroSeconds > 0);
+            })
+        };
+
+        ctx.Interceptors.Add(new CallbackInterceptor(s => intercepterInvoked = true));
+
+        var result = await client.GetNodeInfoAsync(new PrmNodeInfo(ctx));
+
+        Assert.True(callbackInvoked);
+        Assert.True(intercepterInvoked);
+
+        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);
+    }
+
     private static byte[] GetRandomBytes(int size)
     {
         Random rnd = new();