Merge pull request #1114 from iceljc/features/refine-function-indication

refine indication

src/Infrastructure/BotSharp.Abstraction/Conversations/ConversationHookBase.cs

@@ -49,10 +49,10 @@ public abstract class ConversationHookBase : IConversationHook
     public virtual Task OnHumanInterventionNeeded(RoleDialogModel message)
         => Task.CompletedTask;
 
-    public virtual Task OnFunctionExecuting(RoleDialogModel message, string from = InvokeSource.Manual)
+    public virtual Task OnFunctionExecuting(RoleDialogModel message, InvokeFunctionOptions? options = null)
         => Task.CompletedTask;
 
-    public virtual Task OnFunctionExecuted(RoleDialogModel message, string from = InvokeSource.Manual)
+    public virtual Task OnFunctionExecuted(RoleDialogModel message, InvokeFunctionOptions? options = null)
         => Task.CompletedTask;
 
     public virtual Task OnMessageReceived(RoleDialogModel message)

src/Infrastructure/BotSharp.Abstraction/Conversations/Dtos/ChatResponseDto.cs

@@ -32,6 +32,10 @@ public class ChatResponseDto : InstructResult
     [JsonPropertyName("payload")]
     public string? Payload { get; set; }
 
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    [JsonPropertyName("indication")]
+    public string? Indication { get; set; }
+
     [JsonPropertyName("has_message_files")]
     public bool HasMessageFiles { get; set; }
 

src/Infrastructure/BotSharp.Abstraction/Conversations/Enums/ChatEvent.cs

@@ -0,0 +1,22 @@
+namespace BotSharp.Abstraction.Conversations.Enums;
+
+public static class ChatEvent
+{
+    public const string OnConversationInitFromClient = nameof(OnConversationInitFromClient);
+    public const string OnMessageReceivedFromClient = nameof(OnMessageReceivedFromClient);
+    public const string OnMessageReceivedFromAssistant = nameof(OnMessageReceivedFromAssistant);
+
+    public const string OnMessageDeleted = nameof(OnMessageDeleted);
+    public const string OnNotificationGenerated = nameof(OnNotificationGenerated);
+    public const string OnIndicationReceived = nameof(OnIndicationReceived);
+
+    public const string OnConversationContentLogGenerated = nameof(OnConversationContentLogGenerated);
+    public const string OnConversateStateLogGenerated = nameof(OnConversateStateLogGenerated);
+    public const string OnAgentQueueChanged = nameof(OnAgentQueueChanged);
+    public const string OnStateChangeGenerated = nameof(OnStateChangeGenerated);
+
+    public const string BeforeReceiveLlmStreamMessage = nameof(BeforeReceiveLlmStreamMessage);
+    public const string OnReceiveLlmStreamMessage = nameof(OnReceiveLlmStreamMessage);
+    public const string AfterReceiveLlmStreamMessage = nameof(AfterReceiveLlmStreamMessage);
+    public const string OnSenderActionGenerated = nameof(OnSenderActionGenerated);
+}

src/Infrastructure/BotSharp.Abstraction/Conversations/IConversationHook.cs

@@ -61,7 +61,7 @@ public interface IConversationHook : IHookBase
     /// <param name="message"></param>
     /// <param name="from"></param>
     /// <returns></returns>
-    Task OnFunctionExecuting(RoleDialogModel message, string from = InvokeSource.Manual);
+    Task OnFunctionExecuting(RoleDialogModel message, InvokeFunctionOptions? options = null);
 
     /// <summary>
     /// Triggered when the function calling completed.
@@ -69,7 +69,7 @@ public interface IConversationHook : IHookBase
     /// <param name="message"></param>
     /// <param name="from"></param>
     /// <returns></returns>
-    Task OnFunctionExecuted(RoleDialogModel message, string from = InvokeSource.Manual);
+    Task OnFunctionExecuted(RoleDialogModel message, InvokeFunctionOptions? options = null);
 
     Task OnResponseGenerated(RoleDialogModel message);
 

src/Infrastructure/BotSharp.Abstraction/Conversations/IConversationProgressService.cs

@@ -1,10 +0,0 @@
-namespace BotSharp.Abstraction.Conversations;
-
-public delegate Task FunctionExecuting(RoleDialogModel msg);
-public delegate Task FunctionExecuted(RoleDialogModel msg);
-
-public interface IConversationProgressService
-{
-    FunctionExecuted OnFunctionExecuted { get; set; }
-    FunctionExecuting OnFunctionExecuting { get; set; }
-}

src/Infrastructure/BotSharp.Abstraction/Conversations/Models/ConversationSenderActionModel.cs

@@ -1,5 +1,3 @@
-using BotSharp.Abstraction.Messaging.Enums;
-
 namespace BotSharp.Abstraction.Conversations.Models;
 
 public class ConversationSenderActionModel

src/Infrastructure/BotSharp.Abstraction/Conversations/Models/RoleDialogModel.cs

@@ -120,7 +120,7 @@ public class RoleDialogModel : ITrackableMessage
     [JsonIgnore(Condition = JsonIgnoreCondition.Always)]
     public bool IsStreaming { get; set; }
 
-    private RoleDialogModel()
+    public RoleDialogModel()
     {
     }
 

src/Infrastructure/BotSharp.Abstraction/MessageHub/Models/HubObserveData.cs

@@ -0,0 +1,6 @@
+namespace BotSharp.Abstraction.MessageHub.Models;
+
+public class HubObserveData<TData> : ObserveDataBase where TData : class, new()
+{
+    public TData Data { get; set; } = null!;
+}

src/Infrastructure/BotSharp.Abstraction/MessageHub/Models/ObserveDataBase.cs

@@ -0,0 +1,7 @@
+namespace BotSharp.Abstraction.MessageHub.Models;
+
+public class ObserveDataBase
+{
+    public string EventName { get; set; } = null!;
+    public string RefId { get; set; } = null!;
+}

src/Infrastructure/BotSharp.Abstraction/MessageHub/Models/ObserverSubscription.cs

@@ -0,0 +1,28 @@
+using BotSharp.Abstraction.MessageHub.Observers;
+
+namespace BotSharp.Abstraction.MessageHub.Models;
+
+public class ObserverSubscription<T>
+{
+    public IBotSharpObserver<T> Observer { get; set; }
+    public IDisposable Subscription { get; set; }
+
+    public ObserverSubscription()
+    {
+        
+    }
+
+    public ObserverSubscription(
+        IBotSharpObserver<T> observer,
+        IDisposable subscription)
+    {
+        Observer = observer;
+        Subscription = subscription;
+    }
+
+    public void UnSubscribe()
+    {
+        Observer.Deactivate();
+        Subscription.Dispose();
+    }
+}

src/Infrastructure/BotSharp.Abstraction/MessageHub/Observers/BotSharpObserverBase.cs

@@ -0,0 +1,48 @@
+
+namespace BotSharp.Abstraction.MessageHub.Observers;
+
+public abstract class BotSharpObserverBase<T> : IBotSharpObserver<T>
+{
+    private bool _active = false;
+    protected Dictionary<string, Func<T, Task>> _listeners = [];
+
+    protected BotSharpObserverBase()
+    {
+        
+    }
+
+    public virtual string Name => string.Empty;
+
+    public virtual bool Active => _active;
+
+    public virtual void Activate()
+    {
+        _active = true;
+    }
+
+    public virtual void Deactivate()
+    {
+        _active = false;
+        _listeners = [];
+    }
+
+    public virtual void SetEventListeners(Dictionary<string, Func<T, Task>> listeners)
+    {
+        _listeners = listeners;
+    }
+
+    public virtual void OnCompleted()
+    {
+        
+    }
+
+    public virtual void OnError(Exception error)
+    {
+        
+    }
+
+    public virtual void OnNext(T value)
+    {
+        
+    }
+}

src/Infrastructure/BotSharp.Abstraction/MessageHub/Observers/IBotSharpObserver.cs

@@ -0,0 +1,11 @@
+namespace BotSharp.Abstraction.MessageHub.Observers;
+
+public interface IBotSharpObserver<T> : IObserver<T>
+{
+    string Name { get; }
+    bool Active { get; }
+
+    void SetEventListeners(Dictionary<string, Func<T, Task>> listeners);
+    void Activate();
+    void Deactivate();
+}

src/Infrastructure/BotSharp.Abstraction/MessageHub/Services/IObserverService.cs

@@ -0,0 +1,13 @@
+using BotSharp.Abstraction.MessageHub.Models;
+
+namespace BotSharp.Abstraction.MessageHub.Services;
+
+public interface IObserverService
+{
+    IDisposable SubscribeObservers<T>(
+        string refId,
+        IEnumerable<string>? names = null,
+        Dictionary<string, Func<T, Task>>? listeners = null) where T : ObserveDataBase;
+
+    void UnSubscribeObservers<T>(IEnumerable<string>? names = null) where T : ObserveDataBase;
+}

src/Infrastructure/BotSharp.Abstraction/Observables/Models/HubObserveData.cs

@@ -1,7 +0,0 @@
-namespace BotSharp.Abstraction.Observables.Models;
-
-public class HubObserveData : ObserveDataBase
-{
-    public string EventName { get; set; } = null!;
-    public RoleDialogModel Data { get; set; } = null!;
-}

src/Infrastructure/BotSharp.Abstraction/Observables/Models/ObserveDataBase.cs

@@ -1,6 +0,0 @@
-namespace BotSharp.Abstraction.Observables.Models;
-
-public abstract class ObserveDataBase
-{
-    public IServiceProvider ServiceProvider { get; set; } = null!;
-}

src/Infrastructure/BotSharp.Abstraction/Routing/IRoutingService.cs

@@ -26,8 +26,8 @@ public interface IRoutingService
     /// <returns></returns>
     RoutingRule[] GetRulesByAgentId(string id);
 
-    Task<bool> InvokeAgent(string agentId, List<RoleDialogModel> dialogs, string from = InvokeSource.Manual, bool useStream = false);
-    Task<bool> InvokeFunction(string name, RoleDialogModel messages, string from = InvokeSource.Manual);
+    Task<bool> InvokeAgent(string agentId, List<RoleDialogModel> dialogs, InvokeAgentOptions? options = null);
+    Task<bool> InvokeFunction(string name, RoleDialogModel messages, InvokeFunctionOptions? options = null);
     Task<RoleDialogModel> InstructLoop(Agent agent, RoleDialogModel message, List<RoleDialogModel> dialogs);
 
     /// <summary>

src/Infrastructure/BotSharp.Abstraction/Routing/Models/InvokeOptions.cs

@@ -0,0 +1,31 @@
+namespace BotSharp.Abstraction.Routing.Models;
+
+public abstract class InvokeOptions
+{
+    public string From { get; set; }
+}
+
+public class InvokeAgentOptions : InvokeOptions
+{
+    public bool UseStream { get; set; }
+
+    public static InvokeAgentOptions Default()
+    {
+        return new()
+        {
+            From = InvokeSource.Manual,
+            UseStream = false
+        };
+    }
+}
+
+public class InvokeFunctionOptions : InvokeOptions
+{
+    public static InvokeFunctionOptions Default()
+    {
+        return new()
+        {
+            From = InvokeSource.Manual
+        };
+    }
+}

src/Infrastructure/BotSharp.Abstraction/SideCar/Attributes/SideCarAttribute.cs

@@ -23,7 +23,12 @@ public class SideCarAttribute : AsyncMoAttribute
         var instance = context.Target;
         var retType = context.ReturnType;
 
-        var serviceProvider = ((IHaveServiceProvider)instance).ServiceProvider;
+        var serviceProvider = (instance as IHaveServiceProvider)?.ServiceProvider;
+        if (serviceProvider == null)
+        {
+            return;
+        }
+
         var (sidecar, sidecarMethod) = GetSideCarMethod(serviceProvider, methodName, retType, methodArgs);
         if (sidecar == null || sidecarMethod == null)
         {

src/Infrastructure/BotSharp.Abstraction/SideCar/Models/SideCarOptions.cs

@@ -3,19 +3,23 @@ namespace BotSharp.Abstraction.SideCar.Models;
 public class SideCarOptions
 {
     public bool IsInheritStates { get; set; }
-    public IEnumerable<string>? InheritStateKeys { get; set; }
+    public HashSet<string>? InheritStateKeys { get; set; }
+    public HashSet<string>? ExcludedStateKeys { get; set; }
 
     public static SideCarOptions Empty()
     {
         return new();
     }
 
-    public static SideCarOptions InheritStates(IEnumerable<string>? targetStates = null)
+    public static SideCarOptions InheritStates(
+        HashSet<string>? includedStates = null,
+        HashSet<string>? excludedStates = null)
     {
         return new()
         {
             IsInheritStates = true,
-            InheritStateKeys = targetStates
+            InheritStateKeys = includedStates,
+            ExcludedStateKeys = excludedStates
         };
     }
 }

src/Infrastructure/BotSharp.Core.Realtime/Hooks/RealtimeConversationHook.cs

@@ -11,7 +11,7 @@ public class RealtimeConversationHook : ConversationHookBase, IConversationHook
         _services = services;
     }
 
-    public async Task OnFunctionExecuting(RoleDialogModel message, string from = InvokeSource.Manual)
+    public async Task OnFunctionExecuting(RoleDialogModel message, InvokeFunctionOptions? options = null)
     {
         var hub = _services.GetRequiredService<IRealtimeHub>();
         if (hub.HubConn == null)
@@ -32,10 +32,10 @@ public class RealtimeConversationHook : ConversationHookBase, IConversationHook
         }
     }
 
-    public async Task OnFunctionExecuted(RoleDialogModel message, string from = InvokeSource.Manual)
+    public async Task OnFunctionExecuted(RoleDialogModel message, InvokeFunctionOptions? options = null)
     {
         var hub = _services.GetRequiredService<IRealtimeHub>();
-        if (from != InvokeSource.Llm || hub.HubConn == null)
+        if (options?.From != InvokeSource.Llm || hub.HubConn == null)
         {
             return;
         }

src/Infrastructure/BotSharp.Core.Realtime/Services/RealtimeHub.cs

@@ -99,7 +99,7 @@ public class RealtimeHub : IRealtimeHub
                                 agent.Id);
                         }
 
-                        await routing.InvokeFunction(message.FunctionName, message, from: InvokeSource.Llm);
+                        await routing.InvokeFunction(message.FunctionName, message, options: new() { From = InvokeSource.Llm });
                     }
                     else
                     {

src/Infrastructure/BotSharp.Core.SideCar/Services/BotSharpConversationSideCar.cs

@@ -15,6 +15,9 @@
 ******************************************************************************/
 
 using BotSharp.Core.Infrastructures;
+using NetTopologySuite.Index.KdTree;
+using Newtonsoft.Json.Linq;
+using static System.Runtime.InteropServices.JavaScript.JSType;
 
 namespace BotSharp.Core.SideCar.Services;
 
@@ -189,24 +192,29 @@ public class BotSharpConversationSideCar : IConversationSideCar
 
     private void RestoreStates(ConversationState prevStates)
     {
-        var innerStates = prevStates;
+        var preValues = prevStates.Values.ToList();
+        var copy = JsonSerializer.Deserialize<List<StateKeyValue>>(JsonSerializer.Serialize(preValues));
+        var innerStates = new ConversationState(copy ?? []);
         var state = _services.GetRequiredService<IConversationStateService>();
 
         if (_sideCarOptions?.IsInheritStates == true)
         {
+            var hasIncludedStates = _sideCarOptions?.InheritStateKeys?.Any() == true;
+            var hasExcludedStates = _sideCarOptions?.ExcludedStateKeys?.Any() == true;
             var curStates = state.GetCurrentState();
+
             foreach (var pair in curStates)
             {
                 var endNode = pair.Value.Values.LastOrDefault();
                 if (endNode == null) continue;
 
-                if (_sideCarOptions?.InheritStateKeys?.Any() == true
-                    && !_sideCarOptions.InheritStateKeys.Contains(pair.Key))
+                if ((hasIncludedStates && !_sideCarOptions.InheritStateKeys.Contains(pair.Key))
+                    || (hasExcludedStates && _sideCarOptions.ExcludedStateKeys.Contains(pair.Key)))
                 {
                     continue;
                 }
 
-                if (innerStates.ContainsKey(pair.Key))
+                if (innerStates.ContainsKey(pair.Key) && innerStates[pair.Key].Versioning)
                 {
                     innerStates[pair.Key].Values.Add(endNode);
                 }
@@ -223,6 +231,51 @@ public class BotSharpConversationSideCar : IConversationSideCar
             }
         }
 
+        AccumulateLlmStats(state, prevStates, innerStates);
         state.SetCurrentState(innerStates);
     }
+
+    private void AccumulateLlmStats(IConversationStateService state, ConversationState prevState, ConversationState curState)
+    {
+        var dict = new Dictionary<string, Type>
+        {
+            { "prompt_total", typeof(int) },
+            { "completion_total", typeof(int) },
+            { "llm_total_cost", typeof(float) }
+        };
+
+        foreach (var pair in dict)
+        {
+            var preVal = prevState.GetValueOrDefault(pair.Key)?.Values?.LastOrDefault()?.Data;
+            var curVal = state.GetState(pair.Key);
+
+            object data = pair.Value switch
+            {
+                Type t when t == typeof(int) => ParseNumber<int>(preVal) + ParseNumber<int>(curVal),
+                Type t when t == typeof(float) => ParseNumber<float>(preVal) + ParseNumber<float>(curVal),
+                _ => default
+            };
+
+            var cur = curState.GetValueOrDefault(pair.Key);
+            if (cur?.Values?.LastOrDefault() != null)
+            {
+                cur.Values.Last().Data = $"{data}";
+            }
+        }
+    }
+
+    private T ParseNumber<T>(string? data) where T : struct
+    {
+        if (string.IsNullOrEmpty(data))
+        {
+            return default;
+        }
+
+        return typeof(T) switch
+        {
+            Type t when t == typeof(int) => (T)(object)(int.TryParse(data, out var i) ? i : 0),
+            Type t when t == typeof(float) => (T)(object)(float.TryParse(data, out var f) ? f : 0),
+            _ => default
+        };
+    }
 }

src/Infrastructure/BotSharp.Core/BotSharp.Core.csproj

@@ -98,6 +98,7 @@
     <None Remove="data\plugins\config.json" />
 
     <None Remove="data\agents\01e2fc5c-2c89-4ec7-8470-7688608b496c\functions\get_weather.json" />
+    <None Remove="data\agents\01e2fc5c-2c89-4ec7-8470-7688608b496c\functions\get_fun_events.json" />
   </ItemGroup>
 
   <ItemGroup>
@@ -211,6 +212,9 @@
     <Content Include="data\agents\01e2fc5c-2c89-4ec7-8470-7688608b496c\functions\get_weather.json">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
+    <Content Include="data\agents\01e2fc5c-2c89-4ec7-8470-7688608b496c\functions\get_fun_events.json">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
   </ItemGroup>
 
   <ItemGroup>
@@ -242,5 +246,4 @@
       <Pack>true</Pack>
     </Content>
   </ItemGroup>
-
 </Project>

src/Infrastructure/BotSharp.Core/Conversations/ConversationPlugin.cs

@@ -1,18 +1,23 @@
 using BotSharp.Abstraction.Google.Settings;
 using BotSharp.Abstraction.Instructs;
+using BotSharp.Abstraction.MessageHub;
+using BotSharp.Abstraction.MessageHub.Observers;
+using BotSharp.Abstraction.MessageHub.Services;
 using BotSharp.Abstraction.Messaging;
 using BotSharp.Abstraction.Planning;
 using BotSharp.Abstraction.Plugins.Models;
 using BotSharp.Abstraction.Settings;
 using BotSharp.Abstraction.Templating;
 using BotSharp.Core.Instructs;
+using BotSharp.Core.MessageHub;
+using BotSharp.Core.MessageHub.Observers;
+using BotSharp.Core.MessageHub.Services;
 using BotSharp.Core.Messaging;
 using BotSharp.Core.Routing.Reasoning;
 using BotSharp.Core.Templating;
 using BotSharp.Core.Translation;
-using BotSharp.Core.Observables.Queues;
+using Microsoft.AspNetCore.Builder;
 using Microsoft.Extensions.Configuration;
-using BotSharp.Abstraction.Observables.Models;
 
 namespace BotSharp.Core.Conversations;
 
@@ -43,11 +48,14 @@ public class ConversationPlugin : IBotSharpPlugin
             return settingService.Bind<GoogleApiSettings>("GoogleApi");
         });
 
-        services.AddSingleton<MessageHub<HubObserveData>>();
+        // Observer and observable
+        services.AddSingleton<MessageHub<HubObserveData<RoleDialogModel>>>();
+        services.AddScoped<ObserverSubscriptionContainer<HubObserveData<RoleDialogModel>>>();
+        services.AddScoped<IBotSharpObserver<HubObserveData<RoleDialogModel>>, ConversationObserver>();
+        services.AddScoped<IObserverService, ObserverService>();
 
         services.AddScoped<IConversationStorage, ConversationStorage>();
         services.AddScoped<IConversationService, ConversationService>();
-        services.AddScoped<IConversationProgressService, ConversationProgressService>();
         services.AddScoped<IConversationStateService, ConversationStateService>();
         services.AddScoped<ITranslationService, TranslationService>();
 

src/Infrastructure/BotSharp.Core/Conversations/Services/ConversationProgressService.cs

@@ -1,11 +0,0 @@
-namespace BotSharp.Core.Conversations.Services
-{
-    public class ConversationProgressService : IConversationProgressService
-    {
-
-        public FunctionExecuting OnFunctionExecuting { get; set; }
-
-
-        public FunctionExecuted OnFunctionExecuted { get; set; }
-    }
-}

src/Infrastructure/BotSharp.Core/Demo/Functions/GetFunEventsFn.cs

@@ -0,0 +1,51 @@
+using BotSharp.Abstraction.Functions;
+using BotSharp.Core.MessageHub;
+using System.Text.Json.Serialization;
+
+namespace BotSharp.Core.Demo.Functions;
+
+public class GetFunEventsFn : IFunctionCallback
+{
+    private readonly IServiceProvider _services;
+
+    public GetFunEventsFn(IServiceProvider services)
+    {
+        _services = services;
+    }
+
+    public string Name => "get_fun_events";
+    public string Indication => "Searching fun events";
+
+    public async Task<bool> Execute(RoleDialogModel message)
+    {
+        var args = JsonSerializer.Deserialize<WeatherLocation>(message.FunctionArgs);
+        var conv = _services.GetRequiredService<IConversationService>();
+        var messageHub = _services.GetRequiredService<MessageHub<HubObserveData<RoleDialogModel>>>();
+
+        await Task.Delay(1000);
+
+        message.Indication = $"Start querying event data in {args?.City}";
+        messageHub.Push(new()
+        {
+            EventName = ChatEvent.OnIndicationReceived,
+            Data = message,
+            RefId = conv.ConversationId
+        });
+
+        await Task.Delay(1500);
+
+        message.Indication = $"Still searching events in {args?.City}";
+        messageHub.Push(new()
+        {
+            EventName = ChatEvent.OnIndicationReceived,
+            Data = message,
+            RefId = conv.ConversationId
+        });
+
+        await Task.Delay(1500);
+
+        message.Content = $"Here in {args?.City}, there are a lot of fun events in summer.";
+        message.StopCompletion = true;
+        return true;
+    }
+}

src/Infrastructure/BotSharp.Core/Demo/Functions/GetWeatherFn.cs

@@ -1,4 +1,8 @@
 using BotSharp.Abstraction.Functions;
+using BotSharp.Abstraction.Models;
+using BotSharp.Abstraction.SideCar;
+using BotSharp.Core.MessageHub;
+using System.Text.Json.Serialization;
 
 namespace BotSharp.Core.Demo.Functions;
 
@@ -16,8 +20,56 @@ public class GetWeatherFn : IFunctionCallback
 
     public async Task<bool> Execute(RoleDialogModel message)
     {
+        var args = JsonSerializer.Deserialize<WeatherLocation>(message.FunctionArgs);
+        var conv = _services.GetRequiredService<IConversationService>();
+        var messageHub = _services.GetRequiredService<MessageHub<HubObserveData<RoleDialogModel>>>();
+
+        await Task.Delay(1000);
+
+        message.Indication = $"Start querying weather data in {args?.City}";
+        messageHub.Push(new()
+        {
+            EventName = ChatEvent.OnIndicationReceived,
+            Data = message,
+            RefId = conv.ConversationId
+        });
+
+        await Task.Delay(1500);
+
+        message.Indication = $"Still working on it... Hold on, {args?.City}";
+        messageHub.Push(new()
+        {
+            EventName = ChatEvent.OnIndicationReceived,
+            Data = message,
+            RefId = conv.ConversationId
+        });
+
+        await Task.Delay(1500);
+
         message.Content = $"It is a sunny day!";
         message.StopCompletion = false;
+
+#if DEBUG
+        var sidecar = _services.GetService<IConversationSideCar>();
+        if (sidecar != null)
+        {
+            var text = $"I want to know fun events in {args?.City}";
+            var states = new List<MessageState>
+            {
+                new() { Key = "channel", Value = "email" }
+            };
+
+            var msg = await sidecar.SendMessage(message.CurrentAgentId, text, states: states);
+            message.Content = $"{message.Content} {msg.Content}";
+        }
+#endif
+
         return true;
     }
 }
+
+class WeatherLocation
+{
+    [JsonPropertyName("city")]
+    public string City { get; set; }
+}

src/Infrastructure/BotSharp.Core/Evaluations/EvaluationConversationHook.cs

@@ -1,4 +1,5 @@
 using BotSharp.Abstraction.Evaluations;
+using BotSharp.Abstraction.Routing.Models;
 
 namespace BotSharp.Core.Evaluations;
 
@@ -22,13 +23,13 @@ public class EvaluationConversationHook : ConversationHookBase
         return base.OnMessageReceived(message);
     }
 
-    public override Task OnFunctionExecuted(RoleDialogModel message, string from = InvokeSource.Manual)
+    public override Task OnFunctionExecuted(RoleDialogModel message, InvokeFunctionOptions? options = null)
     {
         if (Conversation != null && _convSettings.EnableExecutionLog)
         {
             _logger.Append(Conversation.Id, $"[{DateTime.Now}] {message.Role}: {message.FunctionName}({message.FunctionArgs}) => {message.Content}");
         } 
-        return base.OnFunctionExecuted(message, from: from);
+        return base.OnFunctionExecuted(message, options);
     }
 
     public override Task OnResponseGenerated(RoleDialogModel message)

src/Infrastructure/BotSharp.Core/MessageHub/MessageHub.cs

@@ -1,11 +1,11 @@
 using System.Reactive.Subjects;
 
-namespace BotSharp.Core.Observables.Queues;
+namespace BotSharp.Core.MessageHub;
 
-public class MessageHub<T> where T : class
+public class MessageHub<T> where T : ObserveDataBase
 {
     private readonly ILogger<MessageHub<T>> _logger;
-    private readonly ISubject<T> _observable = new Subject<T>();
+    private readonly ISubject<T> _observable = Subject.Synchronize(new Subject<T>());
     public IObservable<T> Events => _observable;
 
     public MessageHub(ILogger<MessageHub<T>> logger)

src/Infrastructure/BotSharp.Core/MessageHub/Observers/ConversationObserver.cs

@@ -0,0 +1,45 @@
+using BotSharp.Abstraction.MessageHub.Observers;
+
+namespace BotSharp.Core.MessageHub.Observers;
+
+public class ConversationObserver : BotSharpObserverBase<HubObserveData<RoleDialogModel>>
+{
+    private readonly ILogger<ConversationObserver> _logger;
+    private readonly IServiceProvider _services;
+
+    public ConversationObserver(
+        IServiceProvider services,
+        ILogger<ConversationObserver> logger) : base()
+    {
+        _services = services;
+        _logger = logger;
+    }
+
+    public override string Name => nameof(ConversationObserver);
+
+    public override void OnCompleted()
+    {
+        _logger.LogWarning($"{nameof(ConversationObserver)} receives complete notification.");
+    }
+
+    public override void OnError(Exception error)
+    {
+        _logger.LogError(error, $"{nameof(ConversationObserver)} receives error notification: {error.Message}");
+    }
+
+    public override void OnNext(HubObserveData<RoleDialogModel> value)
+    {
+        var conv = _services.GetRequiredService<IConversationService>();
+
+        if (value.EventName == ChatEvent.OnIndicationReceived)
+        {
+#if DEBUG
+            _logger.LogCritical($"Receiving {value.EventName} ({value.Data.Indication}) in {nameof(ConversationObserver)} - {conv.ConversationId}");
+#endif
+            if (_listeners.TryGetValue(value.EventName, out var func) && func != null)
+            {
+                func(value).ConfigureAwait(false).GetAwaiter().GetResult();
+            }
+        }
+    }
+}

src/Infrastructure/BotSharp.Core/MessageHub/Services/ObserverService.cs

@@ -0,0 +1,86 @@
+using BotSharp.Abstraction.MessageHub.Observers;
+using BotSharp.Abstraction.MessageHub.Services;
+using System.Reactive.Linq;
+
+namespace BotSharp.Core.MessageHub.Services;
+
+public class ObserverService : IObserverService
+{
+    private readonly IServiceProvider _services;
+    private readonly ILogger<ObserverService> _logger;
+
+    public ObserverService(
+        IServiceProvider services,
+        ILogger<ObserverService> logger)
+    {
+        _services = services;
+        _logger = logger;
+    }
+
+    public IDisposable SubscribeObservers<T>(
+        string refId,
+        IEnumerable<string>? names = null,
+        Dictionary<string, Func<T, Task>>? listeners = null) where T : ObserveDataBase
+    {
+        var container = _services.GetRequiredService<ObserverSubscriptionContainer<T>>();
+        var observers = _services.GetServices<IBotSharpObserver<T>>()
+                                 .Where(x => !x.Active)
+                                 .ToList();
+
+        if (!names.IsNullOrEmpty())
+        {
+            observers = observers.Where(x => names.Contains(x.Name)).ToList();
+        }
+
+        if (observers.IsNullOrEmpty())
+        {
+            return container;
+        }
+
+        if (!listeners.IsNullOrEmpty())
+        {
+            foreach (var observer in observers)
+            {
+                observer.SetEventListeners(listeners ?? []);
+            }
+        }
+
+#if DEBUG
+        _logger.LogCritical($"Subscribe observers: {string.Join(",", observers.Select(x => x.Name))}");
+#endif
+
+        var subscriptions = new List<ObserverSubscription<T>>();
+        var messageHub = _services.GetRequiredService<MessageHub<T>>();
+        foreach (var observer in observers)
+        {
+            observer.Activate();
+            var sub = messageHub.Events.Where(x => x.RefId == refId).Subscribe(observer);
+            subscriptions.Add(new()
+            {
+                Observer = observer,
+                Subscription = sub
+            });
+        }
+
+        container.Append(subscriptions);
+        return container;
+    }
+
+    public void UnSubscribeObservers<T>(IEnumerable<string>? names = null) where T : ObserveDataBase
+    {
+        var container = _services.GetRequiredService<ObserverSubscriptionContainer<T>>();
+        var subscriptions = container.GetSubscriptions(names);
+
+#if DEBUG
+        _logger.LogCritical($"UnSubscribe observers: {string.Join(",", subscriptions.Select(x => x.Observer.Name))}");
+#endif
+
+        foreach (var sub in subscriptions)
+        {
+            if (!sub.Observer.Active) continue;
+
+            sub.UnSubscribe();
+        }
+        container.Remove(names);
+    }
+}

src/Infrastructure/BotSharp.Core/MessageHub/Services/ObserverSubscriptionContainer.cs

@@ -0,0 +1,64 @@
+namespace BotSharp.Core.MessageHub.Services;
+
+public class ObserverSubscriptionContainer<T> : IDisposable
+{
+    private readonly ILogger<ObserverSubscriptionContainer<T>> _logger;
+
+    private List<ObserverSubscription<T>> _subscriptions = [];
+    private bool _disposed = false;
+
+    public ObserverSubscriptionContainer(
+        ILogger<ObserverSubscriptionContainer<T>> logger)
+    {
+        _logger = logger;
+    }
+
+    public List<ObserverSubscription<T>> GetSubscriptions(IEnumerable<string>? names = null)
+    {
+        if (!names.IsNullOrEmpty())
+        {
+            return _subscriptions.Where(x => names.Contains(x.Observer.Name)).ToList();
+        }
+        return _subscriptions;
+    }
+
+    public void Append(List<ObserverSubscription<T>> subscriptions)
+    {
+        _subscriptions = _subscriptions.Concat(subscriptions).DistinctBy(x => x.Observer.Name).ToList();
+    }
+
+    public void Remove(IEnumerable<string>? names = null)
+    {
+        if (!names.IsNullOrEmpty())
+        {
+            _subscriptions = _subscriptions.Where(x => !names.Contains(x.Observer.Name)).ToList();
+            return;
+        }
+        _subscriptions.Clear();
+    }
+
+    public void Clear()
+    {
+        _subscriptions.Clear();
+    }
+
+    public void Dispose()
+    {
+        if (!_disposed)
+        {
+#if DEBUG
+            _logger.LogCritical($"Start disposing subscriptions...");
+#endif
+            // UnSubscribe all observers
+            foreach (var sub in _subscriptions)
+            {
+                sub.UnSubscribe();
+            }
+            _subscriptions.Clear();
+#if DEBUG
+            _logger.LogCritical($"End disposing subscriptions...");
+#endif
+            _disposed = true;
+        }
+    }
+}

src/Infrastructure/BotSharp.Core/Repository/FileRepository/FileRepository.Conversation.cs

@@ -241,10 +241,9 @@ public partial class FileRepository
         if (!string.IsNullOrEmpty(convDir))
         {
             var breakpointFile = Path.Combine(convDir, BREAKPOINT_FILE);
-
             if (!File.Exists(breakpointFile))
             {
-                File.Create(breakpointFile);
+                File.WriteAllText(breakpointFile, "[]");
             }
 
             var content = File.ReadAllText(breakpointFile);
@@ -285,7 +284,7 @@ public partial class FileRepository
         var breakpointFile = Path.Combine(convDir, BREAKPOINT_FILE);
         if (!File.Exists(breakpointFile))
         {
-            File.Create(breakpointFile);
+            File.WriteAllText(breakpointFile, "[]");
         }
 
         var content = File.ReadAllText(breakpointFile);
@@ -920,7 +919,6 @@ public partial class FileRepository
     private bool SaveTruncatedDialogs(string dialogDir, List<DialogElement> dialogs)
     {
         if (string.IsNullOrEmpty(dialogDir) || dialogs == null) return false;
-        if (!File.Exists(dialogDir)) File.Create(dialogDir);
 
         var texts = ParseDialogElements(dialogs);
         File.WriteAllText(dialogDir, texts);
@@ -930,7 +928,6 @@ public partial class FileRepository
     private bool SaveTruncatedStates(string stateDir, List<StateKeyValue> states)
     {
         if (string.IsNullOrEmpty(stateDir) || states == null) return false;
-        if (!File.Exists(stateDir)) File.Create(stateDir);
 
         var stateStr = JsonSerializer.Serialize(states, _options);
         File.WriteAllText(stateDir, stateStr);
@@ -940,7 +937,6 @@ public partial class FileRepository
     private bool SaveTruncatedLatestStates(string latestStateDir, List<StateKeyValue> states)
     {
         if (string.IsNullOrEmpty(latestStateDir) || states == null) return false;
-        if (!File.Exists(latestStateDir)) File.Create(latestStateDir);
 
         var latestStates = BuildLatestStates(states);
         var stateStr = JsonSerializer.Serialize(latestStates, _options);
@@ -951,7 +947,6 @@ public partial class FileRepository
     private bool SaveTruncatedBreakpoints(string breakpointDir, List<ConversationBreakpoint> breakpoints)
     {
         if (string.IsNullOrEmpty(breakpointDir) || breakpoints == null) return false;
-        if (!File.Exists(breakpointDir)) File.Create(breakpointDir);
 
         var breakpointStr = JsonSerializer.Serialize(breakpoints, _options);
         File.WriteAllText(breakpointDir, breakpointStr);

src/Infrastructure/BotSharp.Core/Repository/FileRepository/FileRepository.KnowledgeBase.cs

@@ -15,17 +15,17 @@ public partial class FileRepository
         }
 
         var configFile = Path.Combine(vectorDir, COLLECTION_CONFIG_FILE);
+        if (!File.Exists(configFile))
+        {
+            File.WriteAllText(configFile, "[]");
+        }
+
         if (reset)
         {
             File.WriteAllText(configFile, JsonSerializer.Serialize(configs ?? new(), _options));
             return true;
         }
 
-        if (!File.Exists(configFile))
-        {
-            File.Create(configFile);
-        }
-
         var str = File.ReadAllText(configFile);
         var savedConfigs = JsonSerializer.Deserialize<List<VectorCollectionConfig>>(str, _options) ?? new();
 

src/Infrastructure/BotSharp.Core/Routing/Reasoning/InstructExecutor.cs

@@ -1,5 +1,6 @@
 using BotSharp.Abstraction.Infrastructures.Enums;
 using BotSharp.Abstraction.Planning;
+using BotSharp.Abstraction.Routing.Models;
 
 namespace BotSharp.Core.Routing.Reasoning;
 
@@ -33,7 +34,7 @@ public class InstructExecutor : IExecutor
         if (message.FunctionName != null)
         {
             var msg = RoleDialogModel.From(message, role: AgentRole.Function);
-            await routing.InvokeFunction(message.FunctionName, msg, from: InvokeSource.Llm);
+            await routing.InvokeFunction(message.FunctionName, msg, options: new() { From = InvokeSource.Routing });
         }
 
         var agentId = routing.Context.GetCurrentAgentId();
@@ -59,11 +60,12 @@ public class InstructExecutor : IExecutor
         {
             var state = _services.GetRequiredService<IConversationStateService>();
             var useStreamMsg = state.GetState("use_stream_message");
-            var ret = await routing.InvokeAgent(
-                agentId,
-                dialogs,
-                from: InvokeSource.Routing,
-                useStream: bool.TryParse(useStreamMsg, out var useStream) && useStream);
+            var options = new InvokeAgentOptions()
+            {
+                From = InvokeSource.Routing,
+                UseStream = bool.TryParse(useStreamMsg, out var useStream) && useStream
+            };
+            var ret = await routing.InvokeAgent(agentId, dialogs, options);
         }
 
         var response = dialogs.Last();

src/Infrastructure/BotSharp.Core/Routing/RoutingService.InvokeAgent.cs

@@ -1,3 +1,4 @@
+using BotSharp.Abstraction.Routing.Models;
 using BotSharp.Abstraction.Templating;
 
 namespace BotSharp.Core.Routing;
@@ -7,9 +8,9 @@ public partial class RoutingService
     public async Task<bool> InvokeAgent(
         string agentId,
         List<RoleDialogModel> dialogs,
-        string from = InvokeSource.Manual,
-        bool useStream = false)
+        InvokeAgentOptions? options = null)
     {
+        options ??= InvokeAgentOptions.Default();
         var agentService = _services.GetRequiredService<IAgentService>();
         var agent = await agentService.LoadAgent(agentId);
 
@@ -36,7 +37,7 @@ public partial class RoutingService
 
         RoleDialogModel response;
         var message = dialogs.Last();
-        if (useStream)
+        if (options?.UseStream == true)
         {
             response = await chatCompletion.GetChatCompletionsStreamingAsync(agent, dialogs);
         }
@@ -59,7 +60,7 @@ public partial class RoutingService
             message.CurrentAgentId = agent.Id;
             message.IsStreaming = response.IsStreaming;
 
-            await InvokeFunction(message, dialogs, from: from, useStream: useStream);
+            await InvokeFunction(message, dialogs, options);
         }
         else
         {
@@ -83,8 +84,7 @@ public partial class RoutingService
     private async Task<bool> InvokeFunction(
         RoleDialogModel message,
         List<RoleDialogModel> dialogs,
-        string from,
-        bool useStream)
+        InvokeAgentOptions? options = null)
     {
         // execute function
         // Save states
@@ -93,7 +93,8 @@ public partial class RoutingService
 
         var routing = _services.GetRequiredService<IRoutingService>();
         // Call functions
-        await routing.InvokeFunction(message.FunctionName, message, from: from);
+        var funcOptions = options != null ? new InvokeFunctionOptions() { From = options.From } : null;
+        await routing.InvokeFunction(message.FunctionName, message, options: funcOptions);
 
         // Pass execution result to LLM to get response
         if (!message.StopCompletion)
@@ -120,7 +121,7 @@ public partial class RoutingService
 
                 // Send to Next LLM
                 var curAgentId = routing.Context.GetCurrentAgentId();
-                await InvokeAgent(curAgentId, dialogs, from, useStream);
+                await InvokeAgent(curAgentId, dialogs, options);
             }
         }
         else

src/Infrastructure/BotSharp.Core/Routing/RoutingService.InvokeFunction.cs

@@ -1,12 +1,14 @@
-using BotSharp.Abstraction.Hooks;
+using BotSharp.Abstraction.Routing.Models;
+using BotSharp.Core.MessageHub;
 using BotSharp.Core.Routing.Executor;
 
 namespace BotSharp.Core.Routing;
 
 public partial class RoutingService
 {
-    public async Task<bool> InvokeFunction(string name, RoleDialogModel message, string from = InvokeSource.Manual)
+    public async Task<bool> InvokeFunction(string name, RoleDialogModel message, InvokeFunctionOptions? options = null)
     {
+        options ??= InvokeFunctionOptions.Default();
         var currentAgentId = message.CurrentAgentId;
         var agentService = _services.GetRequiredService<IAgentService>();
         var agent = await agentService.GetAgent(currentAgentId);
@@ -23,20 +25,22 @@ public partial class RoutingService
         // Clone message
         var clonedMessage = RoleDialogModel.From(message);
         clonedMessage.FunctionName = name;
-
-        var progressService = _services.GetService<IConversationProgressService>();
         clonedMessage.Indication = await funcExecutor.GetIndicatorAsync(message);
 
-        if (progressService?.OnFunctionExecuting != null)
+        var conv = _services.GetRequiredService<IConversationService>();
+        var messageHub = _services.GetRequiredService<MessageHub<HubObserveData<RoleDialogModel>>>();
+        messageHub.Push(new()
         {
-            await progressService.OnFunctionExecuting(clonedMessage);
-        }
+            EventName = ChatEvent.OnIndicationReceived,
+            Data = clonedMessage,
+            RefId = conv.ConversationId
+        });
 
         var hooks = _services.GetHooksOrderByPriority<IConversationHook>(clonedMessage.CurrentAgentId);
         foreach (var hook in hooks)
         {
             hook.SetAgent(agent);
-            await hook.OnFunctionExecuting(clonedMessage, from: from);
+            await hook.OnFunctionExecuting(clonedMessage, options);
         }
 
         bool result = false;
@@ -48,7 +52,7 @@ public partial class RoutingService
             // After functions have been executed
             foreach (var hook in hooks)
             {
-                await hook.OnFunctionExecuted(clonedMessage, from: from);
+                await hook.OnFunctionExecuted(clonedMessage, options);
             }
 
             // Set result to original message
@@ -64,7 +68,7 @@ public partial class RoutingService
         }
         catch (JsonException ex)
         {
-            _logger.LogError($"The input does not contain any JSON tokens:\r\n{message.Content}\r\n{ex.Message}");
+            _logger.LogError(ex, $"The input does not contain any JSON tokens:\r\n{message.Content}\r\n{ex.Message}");
             message.StopCompletion = true;
             message.Content = ex.Message;
         }
@@ -72,7 +76,7 @@ public partial class RoutingService
         {
             message.StopCompletion = true;
             message.Content = ex.Message;
-            _logger.LogError(ex.ToString());
+            _logger.LogError(ex, ex.ToString());
         }
 
         // Make sure content has been populated

src/Infrastructure/BotSharp.Core/Routing/RoutingService.cs

@@ -53,11 +53,12 @@ public partial class RoutingService : IRoutingService
         {
             var state = _services.GetRequiredService<IConversationStateService>();
             var useStreamMsg = state.GetState("use_stream_message");
-            var ret = await routing.InvokeAgent(
-                agentId,
-                dialogs,
-                from: InvokeSource.Routing,
-                useStream: bool.TryParse(useStreamMsg, out var useStream) && useStream);
+            var options = new InvokeAgentOptions()
+            {
+                From = InvokeSource.Routing,
+                UseStream = bool.TryParse(useStreamMsg, out var useStream) && useStream
+            };
+            var ret = await routing.InvokeAgent(agentId, dialogs, options);
         }
 
         var response = dialogs.Last();

src/Infrastructure/BotSharp.Core/Using.cs

@@ -36,6 +36,9 @@ global using BotSharp.Abstraction.Loggers.Services;
 global using BotSharp.Abstraction.Infrastructures.Events;
 global using BotSharp.Abstraction.Templating.Constants;
 global using BotSharp.Abstraction.Realtime.Models.Session;
+global using BotSharp.Abstraction.Conversations.Enums;
+global using BotSharp.Abstraction.Hooks;
+global using BotSharp.Abstraction.MessageHub.Models;
 global using BotSharp.Core.Agents.Services;
 global using BotSharp.Core.Conversations.Services;
 global using BotSharp.Core.Infrastructures;

src/Infrastructure/BotSharp.Core/data/agents/01e2fc5c-2c89-4ec7-8470-7688608b496c/functions/get_fun_events.json

@@ -0,0 +1,15 @@
+{
+  "name": "get_fun_events",
+  "description": "Get fun events information for user.",
+  "visibility_expression": "{% if states.channel == 'email' %}visible{% endif %}",
+  "parameters": {
+    "type": "object",
+    "properties": {
+      "city": {
+        "type": "string",
+        "description": "The city where user wants to find fun events."
+      }
+    },
+    "required": [ "city" ]
+  }
+}

src/Infrastructure/BotSharp.Core/data/agents/01e2fc5c-2c89-4ec7-8470-7688608b496c/functions/get_weather.json

@@ -1,6 +1,7 @@
 {
   "name": "get_weather",
   "description": "Get weather information for user.",
+  "visibility_expression": "{% if states.channel != 'email' %}visible{% endif %}",
   "parameters": {
     "type": "object",
     "properties": {

src/Infrastructure/BotSharp.OpenAPI/Controllers/ConversationController.cs

@@ -1,6 +1,8 @@
 using BotSharp.Abstraction.Files.Constants;
 using BotSharp.Abstraction.Files.Enums;
 using BotSharp.Abstraction.Files.Utilities;
+using BotSharp.Abstraction.MessageHub.Models;
+using BotSharp.Abstraction.MessageHub.Services;
 using BotSharp.Abstraction.Options;
 using BotSharp.Abstraction.Routing;
 using BotSharp.Abstraction.Users.Dtos;
@@ -343,6 +345,9 @@ public class ConversationController : ControllerBase
         [FromRoute] string conversationId,
         [FromBody] NewMessageModel input)
     {
+        var observer = _services.GetRequiredService<IObserverService>();
+        using var container = observer.SubscribeObservers<HubObserveData<RoleDialogModel>>(conversationId);
+
         var conv = _services.GetRequiredService<IConversationService>();
         var inputMsg = new RoleDialogModel(AgentRole.User, input.Text)
         {
@@ -357,7 +362,6 @@ public class ConversationController : ControllerBase
         SetStates(conv, input);
 
         var response = new ChatResponseModel();
-
         await conv.SendMessage(agentId, inputMsg,
             replyMessage: input.Postback,
             async msg =>
@@ -381,6 +385,12 @@ public class ConversationController : ControllerBase
     [HttpPost("/conversation/{agentId}/{conversationId}/sse")]
     public async Task SendMessageSse([FromRoute] string agentId, [FromRoute] string conversationId, [FromBody] NewMessageModel input)
     {
+        var observer = _services.GetRequiredService<IObserverService>();
+        using var container = observer.SubscribeObservers<HubObserveData<RoleDialogModel>>(conversationId, listeners: new()
+        {
+            { ChatEvent.OnIndicationReceived, async data => await OnReceiveToolCallIndication(conversationId, data.Data) }
+        });
+
         var conv = _services.GetRequiredService<IConversationService>();
         var inputMsg = new RoleDialogModel(AgentRole.User, input.Text)
         {
@@ -406,7 +416,6 @@ public class ConversationController : ControllerBase
         Response.Headers.Append(Microsoft.Net.Http.Headers.HeaderNames.ContentType, "text/event-stream");
         Response.Headers.Append(Microsoft.Net.Http.Headers.HeaderNames.CacheControl, "no-cache");
         Response.Headers.Append(Microsoft.Net.Http.Headers.HeaderNames.Connection, "keep-alive");
-        InitProgressService(conversationId);
 
         await conv.SendMessage(agentId, inputMsg,
             replyMessage: input.Postback,
@@ -430,23 +439,18 @@ public class ConversationController : ControllerBase
         // await OnEventCompleted(Response);
     }
 
-    private void InitProgressService(string conversationId)
+    private async Task OnReceiveToolCallIndication(string conversationId, RoleDialogModel msg)
     {
-        var progressService = _services.GetService<IConversationProgressService>();
-        progressService.OnFunctionExecuting = async msg =>
+        var indicator = new ChatResponseModel
         {
-            var indicator = new ChatResponseModel
-            {
-                ConversationId = conversationId,
-                MessageId = msg.MessageId,
-                Text = msg.Indication,
-                Function = "indicating",
-                Instruction = msg.Instruction,
-                States = new Dictionary<string, string>()
-            };
-            await OnChunkReceived(Response, indicator);
+            ConversationId = conversationId,
+            MessageId = msg.MessageId,
+            Text = msg.Indication,
+            Function = "indicating",
+            Instruction = msg.Instruction,
+            States = new Dictionary<string, string>()
         };
-        progressService.OnFunctionExecuted = async msg => { };
+        await OnChunkReceived(Response, indicator);
     }
     #endregion
 

src/Infrastructure/BotSharp.OpenAPI/Controllers/RealtimeController.cs

@@ -26,7 +26,7 @@ public class RealtimeController : ControllerBase
             FunctionName = functionName,
             FunctionArgs = JsonSerializer.Serialize(args)
         };
-        await routing.InvokeFunction(functionName, message, from: InvokeSource.Llm);
+        await routing.InvokeFunction(functionName, message, options: new() { From = InvokeSource.Llm });
         return message.Content;
     }
 }

src/Plugins/BotSharp.Plugin.AzureOpenAI/Providers/Chat/ChatCompletionProvider.cs

@@ -1,9 +1,9 @@
-using Azure;
+using BotSharp.Abstraction.Conversations.Enums;
 using BotSharp.Abstraction.Files.Utilities;
 using BotSharp.Abstraction.Hooks;
-using BotSharp.Abstraction.Observables.Models;
+using BotSharp.Abstraction.MessageHub.Models;
 using BotSharp.Core.Infrastructures.Streams;
-using BotSharp.Core.Observables.Queues;
+using BotSharp.Core.MessageHub;
 using OpenAI.Chat;
 using System.ClientModel;
 
@@ -212,7 +212,8 @@ public class ChatCompletionProvider : IChatCompletion
         var chatClient = client.GetChatClient(_model);
         var (prompt, messages, options) = PrepareOptions(agent, conversations);
 
-        var hub = _services.GetRequiredService<MessageHub<HubObserveData>>();
+        var hub = _services.GetRequiredService<MessageHub<HubObserveData<RoleDialogModel>>>();
+        var conv = _services.GetRequiredService<IConversationService>();
         var messageId = conversations.LastOrDefault()?.MessageId ?? string.Empty;
 
         var contentHooks = _services.GetHooks<IContentGeneratingHook>(agent.Id);
@@ -224,8 +225,8 @@ public class ChatCompletionProvider : IChatCompletion
 
         hub.Push(new()
         {
-            ServiceProvider = _services,
-            EventName = "BeforeReceiveLlmStreamMessage",
+            EventName = ChatEvent.BeforeReceiveLlmStreamMessage,
+            RefId = conv.ConversationId,
             Data = new RoleDialogModel(AgentRole.Assistant, string.Empty)
             {
                 CurrentAgentId = agent.Id,
@@ -268,8 +269,8 @@ public class ChatCompletionProvider : IChatCompletion
                 };
                 hub.Push(new()
                 {
-                    ServiceProvider = _services,
-                    EventName = "OnReceiveLlmStreamMessage",
+                    EventName = ChatEvent.OnReceiveLlmStreamMessage,
+                    RefId = conv.ConversationId,
                     Data = content
                 });
             }
@@ -311,8 +312,8 @@ public class ChatCompletionProvider : IChatCompletion
 
         hub.Push(new()
         {
-            ServiceProvider = _services,
-            EventName = "AfterReceiveLlmStreamMessage",
+            EventName = ChatEvent.AfterReceiveLlmStreamMessage,
+            RefId = conv.ConversationId,
             Data = responseMessage
         });
 

src/Plugins/BotSharp.Plugin.ChatHub/ChatHubPlugin.cs

@@ -1,6 +1,8 @@
 using BotSharp.Abstraction.Crontab;
-using BotSharp.Abstraction.Observables.Models;
-using BotSharp.Core.Observables.Queues;
+using BotSharp.Abstraction.MessageHub.Models;
+using BotSharp.Abstraction.MessageHub.Observers;
+using BotSharp.Core.MessageHub;
+using BotSharp.Core.MessageHub.Observers;
 using BotSharp.Plugin.ChatHub.Hooks;
 using BotSharp.Plugin.ChatHub.Observers;
 using Microsoft.AspNetCore.Builder;
@@ -11,7 +13,7 @@ namespace BotSharp.Plugin.ChatHub;
 /// <summary>
 /// The dialogue channel connects users, AI assistants and customer service representatives.
 /// </summary>
-public class ChatHubPlugin : IBotSharpPlugin, IBotSharpAppPlugin
+public class ChatHubPlugin : IBotSharpPlugin
 {
     public string Id => "6e52d42d-1e23-406b-8599-36af36c83209";
     public string Name => "Chat Hub";
@@ -24,6 +26,8 @@ public class ChatHubPlugin : IBotSharpPlugin, IBotSharpAppPlugin
         config.Bind("ChatHub", settings);
         services.AddSingleton(x => settings);
 
+        services.AddScoped<IBotSharpObserver<HubObserveData<RoleDialogModel>>, ChatHubObserver>();
+
         // Register hooks
         services.AddScoped<IConversationHook, ChatHubConversationHook>();
         services.AddScoped<IConversationHook, StreamingLogHook>();
@@ -32,12 +36,4 @@ public class ChatHubPlugin : IBotSharpPlugin, IBotSharpAppPlugin
         services.AddScoped<IContentGeneratingHook, StreamingLogHook>();
         services.AddScoped<ICrontabHook, ChatHubCrontabHook>();
     }
-
-    public void Configure(IApplicationBuilder app)
-    {
-        var services = app.ApplicationServices;
-        var queue = services.GetRequiredService<MessageHub<HubObserveData>>();
-        var logger = services.GetRequiredService<ILogger<MessageHub<HubObserveData>>>();
-        queue.Events.Subscribe(new ChatHubObserver(logger));
-    }
 }

src/Plugins/BotSharp.Plugin.ChatHub/Helpers/EventEmitter.cs

@@ -0,0 +1,39 @@
+using Microsoft.AspNetCore.SignalR;
+using System.Runtime.CompilerServices;
+
+namespace BotSharp.Plugin.ChatHub.Helpers;
+
+internal class EventEmitter
+{
+    internal static async Task SendChatEvent<T>(
+        IServiceProvider services,
+        ILogger logger,
+        string @event,
+        string conversationId,
+        string userId,
+        T data,
+        string callerClass = "",
+        [CallerMemberName] string callerMethod = "",
+        LogLevel logLevel = LogLevel.Warning)
+    {
+        try
+        {
+            var settings = services.GetRequiredService<ChatHubSettings>();
+            var chatHub = services.GetRequiredService<IHubContext<SignalRHub>>();
+
+            switch (settings.EventDispatchBy)
+            {
+                case EventDispatchType.Group when !string.IsNullOrEmpty(conversationId):
+                    await chatHub.Clients.Group(conversationId).SendAsync(@event, data);
+                    break;
+                case EventDispatchType.User when !string.IsNullOrEmpty(userId):
+                    await chatHub.Clients.User(userId).SendAsync(@event, data);
+                    break;
+            }
+        }
+        catch (Exception ex)
+        {
+            logger.Log(logLevel, ex, $"Failed to send event '{@event}' in ({callerClass}-{callerMethod}) (conversation id: {conversationId})");
+        }
+    }
+}

src/Plugins/BotSharp.Plugin.ChatHub/Hooks/ChatHubConversationHook.cs

@@ -1,8 +1,11 @@
 using BotSharp.Abstraction.Conversations.Dtos;
+using BotSharp.Abstraction.Conversations.Enums;
 using BotSharp.Abstraction.Routing.Enums;
+using BotSharp.Abstraction.Routing.Models;
 using BotSharp.Abstraction.SideCar;
 using BotSharp.Abstraction.Users.Dtos;
 using Microsoft.AspNetCore.SignalR;
+using System.Runtime.CompilerServices;
 
 namespace BotSharp.Plugin.ChatHub.Hooks;
 
@@ -15,15 +18,6 @@ public class ChatHubConversationHook : ConversationHookBase
     private readonly BotSharpOptions _options;
     private readonly ChatHubSettings _settings;
 
-    #region Events
-    private const string INIT_CLIENT_CONVERSATION = "OnConversationInitFromClient";
-    private const string RECEIVE_CLIENT_MESSAGE = "OnMessageReceivedFromClient";
-    private const string RECEIVE_ASSISTANT_MESSAGE = "OnMessageReceivedFromAssistant";
-    private const string GENERATE_SENDER_ACTION = "OnSenderActionGenerated";
-    private const string DELETE_MESSAGE = "OnMessageDeleted";
-    private const string GENERATE_NOTIFICATION = "OnNotificationGenerated";
-    #endregion
-
     public ChatHubConversationHook(
         IServiceProvider services,
         IHubContext<SignalRHub> chatHub,
@@ -51,7 +45,8 @@ public class ChatHubConversationHook : ConversationHookBase
         var user = await userService.GetUser(conv.User.Id);
         conv.User = UserDto.FromUser(user);
 
-        await InitClientConversation(conv.Id, conv);
+        //await InitClientConversation(conv.Id, conv);
+        await SendEvent(ChatEvent.OnConversationInitFromClient, conv.Id, conv);
         await base.OnConversationInitialized(conversation);
     }
 
@@ -72,7 +67,7 @@ public class ChatHubConversationHook : ConversationHookBase
             Text = !string.IsNullOrEmpty(message.SecondaryContent) ? message.SecondaryContent : message.Content,
             Sender = UserDto.FromUser(sender)
         };
-        await ReceiveClientMessage(conv.ConversationId, model);
+        await SendEvent(ChatEvent.OnMessageReceivedFromClient, conv.ConversationId, model);
 
         // Send typing-on to client
         var action = new ConversationSenderActionModel
@@ -80,23 +75,13 @@ public class ChatHubConversationHook : ConversationHookBase
             ConversationId = conv.ConversationId,
             SenderAction = SenderActionEnum.TypingOn
         };
-
-        await GenerateSenderAction(conv.ConversationId, action);
+        await SendEvent(ChatEvent.OnSenderActionGenerated, conv.ConversationId, action);
         await base.OnMessageReceived(message);
     }
 
-    public override async Task OnFunctionExecuting(RoleDialogModel message, string from = InvokeSource.Manual)
+    public override async Task OnFunctionExecuting(RoleDialogModel message, InvokeFunctionOptions? options = null)
     {
-        var conv = _services.GetRequiredService<IConversationService>();
-        var action = new ConversationSenderActionModel
-        {
-            ConversationId = conv.ConversationId,
-            SenderAction = SenderActionEnum.TypingOn,
-            Indication = message.Indication
-        };
-
-        await GenerateSenderAction(conv.ConversationId, action);
-        await base.OnFunctionExecuting(message, from: from);
+        await base.OnFunctionExecuting(message, options);
     }
 
     public override async Task OnPostbackMessageReceived(RoleDialogModel message, PostbackMessageModel replyMsg)
@@ -110,7 +95,7 @@ public class ChatHubConversationHook : ConversationHookBase
 
         var conv = _services.GetRequiredService<IConversationService>();
         var state = _services.GetRequiredService<IConversationStateService>();
-        var json = JsonSerializer.Serialize(new ChatResponseDto()
+        var data = new ChatResponseDto()
         {
             ConversationId = conv.ConversationId,
             MessageId = message.MessageId,
@@ -126,7 +111,7 @@ public class ChatHubConversationHook : ConversationHookBase
                 LastName = "Assistant",
                 Role = AgentRole.Assistant
             }
-        }, _options.JsonSerializerOptions);
+        };
 
         // Send typing-off to client
         var action = new ConversationSenderActionModel
@@ -134,13 +119,9 @@ public class ChatHubConversationHook : ConversationHookBase
             ConversationId = conv.ConversationId,
             SenderAction = SenderActionEnum.TypingOff
         };
+        await SendEvent(ChatEvent.OnSenderActionGenerated, conv.ConversationId, action);
 
-        if (!message.IsStreaming)
-        {
-            await GenerateSenderAction(conv.ConversationId, action);
-        }
-        
-        await ReceiveAssistantMessage(conv.ConversationId, json);
+        await SendEvent(ChatEvent.OnMessageReceivedFromAssistant, conv.ConversationId, data);
         await base.OnResponseGenerated(message);
     }
 
@@ -148,7 +129,7 @@ public class ChatHubConversationHook : ConversationHookBase
     public override async Task OnNotificationGenerated(RoleDialogModel message)
     {
         var conv = _services.GetRequiredService<IConversationService>();
-        var json = JsonSerializer.Serialize(new ChatResponseDto()
+        var data = new ChatResponseDto()
         {
             ConversationId = conv.ConversationId,
             MessageId = message.MessageId,
@@ -162,9 +143,9 @@ public class ChatHubConversationHook : ConversationHookBase
                 LastName = "Assistant",
                 Role = AgentRole.Assistant
             }
-        }, _options.JsonSerializerOptions);
+        };
 
-        await GenerateNotification(conv.ConversationId, json);
+        await SendEvent(ChatEvent.OnNotificationGenerated, conv.ConversationId, data);
         await base.OnNotificationGenerated(message);
     }
 
@@ -177,7 +158,7 @@ public class ChatHubConversationHook : ConversationHookBase
             MessageId = messageId
         };
 
-        await DeleteMessage(conversationId, model);
+        await SendEvent(ChatEvent.OnMessageDeleted, conversationId, model);
         await base.OnMessageDeleted(conversationId, messageId);
     }
 
@@ -188,119 +169,10 @@ public class ChatHubConversationHook : ConversationHookBase
         return sidecar == null || !sidecar.IsEnabled;
     }
 
-    private async Task InitClientConversation(string conversationId, ConversationDto conversation)
+    private async Task SendEvent<T>(string @event, string conversationId, T data, [CallerMemberName] string callerName = "")
     {
-        try
-        {
-            if (_settings.EventDispatchBy == EventDispatchType.Group)
-            {
-                await _chatHub.Clients.Group(conversationId).SendAsync(INIT_CLIENT_CONVERSATION, conversation);
-            }
-            else
-            {
-                await _chatHub.Clients.User(_user.Id).SendAsync(INIT_CLIENT_CONVERSATION, conversation);
-            }
-        }
-        catch (Exception ex)
-        {
-            _logger.LogWarning(ex, $"Failed to init client conversation in {nameof(ChatHubConversationHook)} (conversation id: {conversationId})");
-        }
-    }
-
-    private async Task ReceiveClientMessage(string conversationId, ChatResponseDto model)
-    {
-        try
-        {
-            if (_settings.EventDispatchBy == EventDispatchType.Group)
-            {
-                await _chatHub.Clients.Group(conversationId).SendAsync(RECEIVE_CLIENT_MESSAGE, model);
-            }
-            else
-            {
-                await _chatHub.Clients.User(_user.Id).SendAsync(RECEIVE_CLIENT_MESSAGE, model);
-            }
-        }
-        catch (Exception ex)
-        {
-            _logger.LogWarning(ex, $"Failed to receive assistant message in {nameof(ChatHubConversationHook)} (conversation id: {conversationId})");
-        }
-    }
-
-    private async Task ReceiveAssistantMessage(string conversationId, string? json)
-    {
-        try
-        {
-            if (_settings.EventDispatchBy == EventDispatchType.Group)
-            {
-                await _chatHub.Clients.Group(conversationId).SendAsync(RECEIVE_ASSISTANT_MESSAGE, json);
-            }
-            else
-            {
-                await _chatHub.Clients.User(_user.Id).SendAsync(RECEIVE_ASSISTANT_MESSAGE, json);
-            }
-        }
-        catch (Exception ex)
-        {
-            _logger.LogWarning(ex, $"Failed to receive assistant message in {nameof(ChatHubConversationHook)} (conversation id: {conversationId})");
-        }
-
-    }
-
-    private async Task GenerateSenderAction(string conversationId, ConversationSenderActionModel action)
-    {
-        try
-        {
-            if (_settings.EventDispatchBy == EventDispatchType.Group)
-            {
-                await _chatHub.Clients.Group(conversationId).SendAsync(GENERATE_SENDER_ACTION, action);
-            }
-            else
-            {
-                await _chatHub.Clients.User(_user.Id).SendAsync(GENERATE_SENDER_ACTION, action);
-            }
-        }
-        catch (Exception ex)
-        {
-            _logger.LogWarning(ex, $"Failed to generate sender action in {nameof(ChatHubConversationHook)} (conversation id: {conversationId})");
-        }
-    }
-
-    private async Task DeleteMessage(string conversationId, ChatResponseDto model)
-    {
-        try
-        {
-            if (_settings.EventDispatchBy == EventDispatchType.Group)
-            {
-                await _chatHub.Clients.Group(conversationId).SendAsync(DELETE_MESSAGE, model);
-            }
-            else
-            {
-                await _chatHub.Clients.User(_user.Id).SendAsync(DELETE_MESSAGE, model);
-            }
-        }
-        catch (Exception ex)
-        {
-            _logger.LogWarning(ex, $"Failed to delete message in {nameof(ChatHubConversationHook)} (conversation id: {conversationId})");
-        }
-    }
-
-    private async Task GenerateNotification(string conversationId, string? json)
-    {
-        try
-        {
-            if (_settings.EventDispatchBy == EventDispatchType.Group)
-            {
-                await _chatHub.Clients.Group(conversationId).SendAsync(GENERATE_NOTIFICATION, json);
-            }
-            else
-            {
-                await _chatHub.Clients.User(_user.Id).SendAsync(GENERATE_NOTIFICATION, json);
-            }
-        }
-        catch (Exception ex)
-        {
-            _logger.LogWarning(ex, $"Failed to generate notification in {nameof(ChatHubConversationHook)} (conversation id: {conversationId})");
-        }
+        var user = _services.GetRequiredService<IUserIdentity>();
+        await EventEmitter.SendChatEvent(_services, _logger, @event, conversationId, user?.Id, data, nameof(ChatHubConversationHook), callerName);
     }
     #endregion
 }

src/Plugins/BotSharp.Plugin.ChatHub/Hooks/ChatHubCrontabHook.cs

@@ -1,4 +1,5 @@
 using BotSharp.Abstraction.Conversations.Dtos;
+using BotSharp.Abstraction.Conversations.Enums;
 using BotSharp.Abstraction.Crontab;
 using BotSharp.Abstraction.Crontab.Models;
 using Microsoft.AspNetCore.SignalR;
@@ -14,11 +15,8 @@ public class ChatHubCrontabHook : ICrontabHook
     private readonly BotSharpOptions _options;
     private readonly ChatHubSettings _settings;
 
-    #region Events
-    private const string GENERATE_NOTIFICATION = "OnNotificationGenerated";
-    #endregion
-
-    public ChatHubCrontabHook(IServiceProvider services,
+    public ChatHubCrontabHook(
+        IServiceProvider services,
         IHubContext<SignalRHub> chatHub,
         ILogger<ChatHubCrontabHook> logger,
         IUserIdentity user,
@@ -35,7 +33,7 @@ public class ChatHubCrontabHook : ICrontabHook
 
     public async Task OnCronTriggered(CrontabItem item)
     {
-        var json = JsonSerializer.Serialize(new ChatResponseDto()
+        var data = new ChatResponseDto()
         {
             ConversationId = item.ConversationId,
             MessageId = Guid.NewGuid().ToString(),
@@ -47,16 +45,16 @@ public class ChatHubCrontabHook : ICrontabHook
                 LastName = "AI",
                 Role = AgentRole.Assistant
             }
-        }, _options.JsonSerializerOptions);
+        };
 
-        await SendEvent(item, json);
+        await SendEvent(item, data);
     }
 
-    private async Task SendEvent(CrontabItem item, string json)
+    private async Task SendEvent(CrontabItem item, ChatResponseDto data)
     {
         try
         {
-            await _chatHub.Clients.User(item.UserId).SendAsync(GENERATE_NOTIFICATION, json);
+            await _chatHub.Clients.User(item.UserId).SendAsync(ChatEvent.OnNotificationGenerated, data);
         }
         catch { }
     }

src/Plugins/BotSharp.Plugin.ChatHub/Hooks/StreamingLogHook.cs

@@ -1,5 +1,8 @@
+using BotSharp.Abstraction.Conversations.Enums;
 using BotSharp.Abstraction.Routing.Enums;
+using BotSharp.Abstraction.Routing.Models;
 using Microsoft.AspNetCore.SignalR;
+using System.Runtime.CompilerServices;
 using System.Text.Encodings.Web;
 using System.Text.Unicode;
 
@@ -19,13 +22,6 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
     private readonly IAgentService _agentService;
     private readonly IRoutingContext _routingCtx;
 
-    #region Events
-    private const string CONTENT_LOG_GENERATED = "OnConversationContentLogGenerated";
-    private const string STATE_LOG_GENERATED = "OnConversateStateLogGenerated";
-    private const string AGENT_QUEUE_CHANGED = "OnAgentQueueChanged";
-    private const string STATE_CHANGED = "OnStateChangeGenerated";
-    #endregion
-
     public StreamingLogHook(
         ConversationSetting convSettings,
         BotSharpOptions options,
@@ -65,7 +61,8 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
             Source = ContentLogSource.UserInput,
             Log = log
         };
-        await SendContentLog(conversationId, input);
+        //await SendContentLog(conversationId, input);
+        await SendEvent(ChatEvent.OnConversationContentLogGenerated, conversationId, BuildContentLog(input));
     }
 
     public override async Task OnPostbackMessageReceived(RoleDialogModel message, PostbackMessageModel replyMsg)
@@ -83,7 +80,8 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
             Source = ContentLogSource.UserInput,
             Log = log
         };
-        await SendContentLog(conversationId, input);
+        //await SendContentLog(conversationId, input);
+        await SendEvent(ChatEvent.OnConversationContentLogGenerated, conversationId, BuildContentLog(input));
     }
 
     public async Task OnSessionUpdated(Agent agent, string instruction, FunctionDef[] functions, bool isInit = false)
@@ -112,7 +110,8 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
             Source = ContentLogSource.Prompt,
             Log = log
         };
-        await SendContentLog(conversationId, input);
+        //await SendContentLog(conversationId, input);
+        await SendEvent(ChatEvent.OnConversationContentLogGenerated, conversationId, BuildContentLog(input));
     }
 
     public async Task OnRenderingTemplate(Agent agent, string name, string content)
@@ -134,7 +133,8 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
             Source = ContentLogSource.HardRule,
             Log = log
         };
-        await SendContentLog(conversationId, input);
+        //await SendContentLog(conversationId, input);
+        await SendEvent(ChatEvent.OnConversationContentLogGenerated, conversationId, BuildContentLog(input));
     }
 
     public async Task BeforeGenerating(Agent agent, List<RoleDialogModel> conversations)
@@ -142,7 +142,7 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
         if (!_convSettings.ShowVerboseLog) return;
     }
 
-    public override async Task OnFunctionExecuting(RoleDialogModel message, string from = InvokeSource.Manual)
+    public override async Task OnFunctionExecuting(RoleDialogModel message, InvokeFunctionOptions? options = null)
     {
         var conversationId = _state.GetConversationId();
         if (string.IsNullOrEmpty(conversationId)) return;
@@ -162,10 +162,11 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
             Source = ContentLogSource.FunctionCall,
             Log = log
         };
-        await SendContentLog(conversationId, input);
+        //await SendContentLog(conversationId, input);
+        await SendEvent(ChatEvent.OnConversationContentLogGenerated, conversationId, BuildContentLog(input));
     }
 
-    public override async Task OnFunctionExecuted(RoleDialogModel message, string from = InvokeSource.Manual)
+    public override async Task OnFunctionExecuted(RoleDialogModel message, InvokeFunctionOptions? options = null)
     {
         var conversationId = _state.GetConversationId();
         if (string.IsNullOrEmpty(conversationId)) return;
@@ -183,7 +184,8 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
             Source = ContentLogSource.FunctionCall,
             Log = log
         };
-        await SendContentLog(conversationId, input);
+        //await SendContentLog(conversationId, input);
+        await SendEvent(ChatEvent.OnConversationContentLogGenerated, conversationId, BuildContentLog(input));
     }
 
     /// <summary>
@@ -210,7 +212,8 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
             Source = ContentLogSource.Prompt,
             Log = log
         };
-        await SendContentLog(conversationId, input);
+        //await SendContentLog(conversationId, input);
+        await SendEvent(ChatEvent.OnConversationContentLogGenerated, conversationId, BuildContentLog(input));
     }
 
     /// <summary>
@@ -225,7 +228,8 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
 
         var conv = _services.GetRequiredService<IConversationService>();
         var routingCtx = _services.GetRequiredService<IRoutingContext>();
-        await SendStateLog(conv.ConversationId, routingCtx.EntryAgentId, _state.GetStates(), message);
+        var stateLog = BuildStateLog(conv.ConversationId, routingCtx.EntryAgentId, _state.GetStates(), message);
+        await SendEvent(ChatEvent.OnConversateStateLogGenerated, conv.ConversationId, stateLog);
 
         if (message.Role == AgentRole.Assistant)
         {
@@ -244,7 +248,7 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
                 Source = ContentLogSource.AgentResponse,
                 Log = log
             };
-            await SendContentLog(conversationId, input);
+            await SendEvent(ChatEvent.OnConversationContentLogGenerated, conversationId, BuildContentLog(input));
         }
     }
 
@@ -262,7 +266,7 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
             Source = ContentLogSource.FunctionCall,
             Log = log
         };
-        await SendContentLog(conversationId, input);
+        await SendEvent(ChatEvent.OnConversationContentLogGenerated, conversationId, BuildContentLog(input));
     }
 
     public override async Task OnConversationEnding(RoleDialogModel message)
@@ -279,7 +283,7 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
             Source = ContentLogSource.FunctionCall,
             Log = log
         };
-        await SendContentLog(conversationId, input);
+        await SendEvent(ChatEvent.OnConversationContentLogGenerated, conversationId, BuildContentLog(input));
     }
 
     public override async Task OnBreakpointUpdated(string conversationId, bool resetStates)
@@ -307,7 +311,7 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
             },
             Log = log
         };
-        await SendContentLog(conversationId, input);
+        await SendEvent(ChatEvent.OnConversationContentLogGenerated, conversationId, BuildContentLog(input));
     }
 
     public override async Task OnStateChanged(StateChangeModel stateChange)
@@ -317,7 +321,7 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
 
         if (stateChange == null) return;
 
-        await SendStateChange(conversationId, stateChange);
+        await SendEvent(ChatEvent.OnStateChangeGenerated, conversationId, BuildStateChangeLog(stateChange));
     }
     #endregion
 
@@ -331,7 +335,7 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
 
         // Agent queue log
         var log = $"{agent.Name} is enqueued";
-        await SendAgentQueueLog(conversationId, log);
+        await SendEvent(ChatEvent.OnAgentQueueChanged, conversationId, BuildAgentQueueChangedLog(conversationId, log));
 
         // Content log
         log = $"{agent.Name} is enqueued{(reason != null ? $" ({reason})" : "")}";
@@ -346,7 +350,7 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
             Source = ContentLogSource.HardRule,
             Log = log
         };
-        await SendContentLog(conversationId, input);
+        await SendEvent(ChatEvent.OnConversationContentLogGenerated, conversationId, BuildContentLog(input));
     }
 
     public async Task OnAgentDequeued(string agentId, string currentAgentId, string? reason = null)
@@ -359,7 +363,7 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
 
         // Agent queue log
         var log = $"{agent.Name} is dequeued";
-        await SendAgentQueueLog(conversationId, log);
+        await SendEvent(ChatEvent.OnAgentQueueChanged, conversationId, BuildAgentQueueChangedLog(conversationId, log));
 
         // Content log
         log = $"{agent.Name} is dequeued{(reason != null ? $" ({reason})" : "")}, current agent is {currentAgent?.Name}";
@@ -374,7 +378,7 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
             Source = ContentLogSource.HardRule,
             Log = log
         };
-        await SendContentLog(conversationId, input);
+        await SendEvent(ChatEvent.OnConversationContentLogGenerated, conversationId, BuildContentLog(input));
     }
 
     public async Task OnAgentReplaced(string fromAgentId, string toAgentId, string? reason = null)
@@ -387,7 +391,7 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
 
         // Agent queue log
         var log = $"Agent queue is replaced from {fromAgent.Name} to {toAgent.Name}";
-        await SendAgentQueueLog(conversationId, log);
+        await SendEvent(ChatEvent.OnAgentQueueChanged, conversationId, BuildAgentQueueChangedLog(conversationId, log));
 
         // Content log
         log = $"{fromAgent.Name} is replaced to {toAgent.Name}{(reason != null ? $" ({reason})" : "")}";
@@ -402,7 +406,7 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
             Source = ContentLogSource.HardRule,
             Log = log
         };
-        await SendContentLog(conversationId, input);
+        await SendEvent(ChatEvent.OnConversationContentLogGenerated, conversationId, BuildContentLog(input));
     }
 
     public async Task OnAgentQueueEmptied(string agentId, string? reason = null)
@@ -412,7 +416,7 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
 
         // Agent queue log
         var log = $"Agent queue is empty";
-        await SendAgentQueueLog(conversationId, log);
+        await SendEvent(ChatEvent.OnAgentQueueChanged, conversationId, BuildAgentQueueChangedLog(conversationId, log));
 
         // Content log
         log = reason ?? "Agent queue is cleared";
@@ -427,7 +431,7 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
             Source = ContentLogSource.HardRule,
             Log = log
         };
-        await SendContentLog(conversationId, input);
+        await SendEvent(ChatEvent.OnConversationContentLogGenerated, conversationId, BuildContentLog(input));
     }
 
     public async Task OnRoutingInstructionReceived(FunctionCallFromLlm instruct, RoleDialogModel message)
@@ -446,7 +450,7 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
             Source = ContentLogSource.AgentResponse,
             Log = log
         };
-        await SendContentLog(conversationId, input);
+        await SendEvent(ChatEvent.OnConversationContentLogGenerated, conversationId, BuildContentLog(input));
     }
 
     public async Task OnRoutingInstructionRevised(FunctionCallFromLlm instruct, RoleDialogModel message)
@@ -464,90 +468,19 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
             Source = ContentLogSource.HardRule,
             Log = log
         };
-        await SendContentLog(conversationId, input);
+        await SendEvent(ChatEvent.OnConversationContentLogGenerated, conversationId, BuildContentLog(input));
     }
     #endregion
 
 
     #region Private methods
-    private async Task SendContentLog(string conversationId, ContentLogInputModel input)
+    private async Task SendEvent<T>(string @event, string conversationId, T data, [CallerMemberName] string callerName = "")
     {
-        try
-        {
-            if (_settings.EventDispatchBy == EventDispatchType.Group)
-            {
-                await _chatHub.Clients.Group(conversationId).SendAsync(CONTENT_LOG_GENERATED, BuildContentLog(input));
-            }
-            else
-            {
-                await _chatHub.Clients.User(_user.Id).SendAsync(CONTENT_LOG_GENERATED, BuildContentLog(input));
-            }
-        }
-        catch (Exception ex)
-        {
-            _logger.LogWarning(ex, $"Failed to send content log in {nameof(StreamingLogHook)} (conversation id: {conversationId}).");
-        }
+        var user = _services.GetRequiredService<IUserIdentity>();
+        await EventEmitter.SendChatEvent(_services, _logger, @event, conversationId, user?.Id, data, nameof(StreamingLogHook), callerName);
     }
 
-    private async Task SendStateLog(string conversationId, string agentId, Dictionary<string, string> states, RoleDialogModel message)
-    {
-        try
-        {
-            if (_settings.EventDispatchBy == EventDispatchType.Group)
-            {
-                await _chatHub.Clients.Group(conversationId).SendAsync(STATE_LOG_GENERATED, BuildStateLog(conversationId, agentId, states, message));
-            }
-            else
-            {
-                await _chatHub.Clients.User(_user.Id).SendAsync(STATE_LOG_GENERATED, BuildStateLog(conversationId, agentId, states, message));
-            }
-        }
-        catch (Exception ex)
-        {
-            _logger.LogWarning(ex, $"Failed to send state log in {nameof(StreamingLogHook)} (conversation id: {conversationId}).");
-        }
-    }
-
-    private async Task SendAgentQueueLog(string conversationId, string log)
-    {
-        try
-        {
-            if (_settings.EventDispatchBy == EventDispatchType.Group)
-            {
-                await _chatHub.Clients.Group(conversationId).SendAsync(AGENT_QUEUE_CHANGED, BuildAgentQueueChangedLog(conversationId, log));
-            }
-            else
-            {
-                await _chatHub.Clients.User(_user.Id).SendAsync(AGENT_QUEUE_CHANGED, BuildAgentQueueChangedLog(conversationId, log));
-            }
-        }
-        catch (Exception ex)
-        {
-            _logger.LogWarning(ex, $"Failed to send agent queue log in {nameof(StreamingLogHook)} (conversation id: {conversationId}).");
-        }
-    }
-
-    private async Task SendStateChange(string conversationId, StateChangeModel stateChange)
-    {
-        try
-        {
-            if (_settings.EventDispatchBy == EventDispatchType.Group)
-            {
-                await _chatHub.Clients.Group(conversationId).SendAsync(STATE_CHANGED, BuildStateChangeLog(stateChange));
-            }
-            else
-            {
-                await _chatHub.Clients.User(_user.Id).SendAsync(STATE_CHANGED, BuildStateChangeLog(stateChange));
-            }
-        }
-        catch (Exception ex)
-        {
-            _logger.LogWarning(ex, $"Failed to send state change in {nameof(StreamingLogHook)} (conversation id: {conversationId}).");
-        }
-    }
-
-
-    private string BuildContentLog(ContentLogInputModel input)
+    private ContentLogOutputModel BuildContentLog(ContentLogInputModel input)
     {
         var output = new ContentLogOutputModel
         {
@@ -561,8 +494,6 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
             CreatedTime = DateTime.UtcNow
         };
 
-        var json = JsonSerializer.Serialize(output, _options.JsonSerializerOptions);
-
         var convSettings = _services.GetRequiredService<ConversationSetting>();
         if (convSettings.EnableContentLog)
         {
@@ -570,10 +501,10 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
             db.SaveConversationContentLog(output);
         }
 
-        return json;
+        return output;
     }
 
-    private string BuildStateLog(string conversationId, string agentId, Dictionary<string, string> states, RoleDialogModel message)
+    private ConversationStateLogModel BuildStateLog(string conversationId, string agentId, Dictionary<string, string> states, RoleDialogModel message)
     {
         var log = new ConversationStateLogModel
         {
@@ -591,10 +522,10 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
             db.SaveConversationStateLog(log);
         }
 
-        return JsonSerializer.Serialize(log, _options.JsonSerializerOptions);
+        return log;
     }
 
-    private string BuildStateChangeLog(StateChangeModel stateChange)
+    private StateChangeOutputModel BuildStateChangeLog(StateChangeModel stateChange)
     {
         var log = new StateChangeOutputModel
         {
@@ -611,10 +542,10 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
             CreateTime = DateTime.UtcNow
         };
 
-        return JsonSerializer.Serialize(log, _options.JsonSerializerOptions);
+        return log;
     }
 
-    private string BuildAgentQueueChangedLog(string conversationId, string log)
+    private AgentQueueChangedLogModel BuildAgentQueueChangedLog(string conversationId, string log)
     {
         var model = new AgentQueueChangedLogModel
         {
@@ -623,7 +554,7 @@ public class StreamingLogHook : ConversationHookBase, IContentGeneratingHook, IR
             CreatedTime = DateTime.UtcNow
         };
 
-        return JsonSerializer.Serialize(model, _options.JsonSerializerOptions);
+        return model;
     }
 
     private string GetMessageContent(RoleDialogModel message)

src/Plugins/BotSharp.Plugin.ChatHub/Hooks/WelcomeHook.cs

@@ -1,5 +1,7 @@
 using BotSharp.Abstraction.Conversations.Dtos;
+using BotSharp.Abstraction.Conversations.Enums;
 using Microsoft.AspNetCore.SignalR;
+using System.Runtime.CompilerServices;
 
 namespace BotSharp.Plugin.ChatHub.Hooks;
 
@@ -13,11 +15,8 @@ public class WelcomeHook : ConversationHookBase
     private readonly BotSharpOptions _options;
     private readonly ChatHubSettings _settings;
 
-    #region Events
-    private const string RECEIVE_ASSISTANT_MESSAGE = "OnMessageReceivedFromAssistant";
-    #endregion
-
-    public WelcomeHook(IServiceProvider services,
+    public WelcomeHook(
+        IServiceProvider services,
         IHubContext<SignalRHub> chatHub,
         ILogger<WelcomeHook> logger,
         IUserIdentity user,
@@ -64,7 +63,7 @@ public class WelcomeHook : ConversationHookBase
                     RichContent = richContent
                 };
 
-                var json = JsonSerializer.Serialize(new ChatResponseDto()
+                var data = new ChatResponseDto()
                 {
                     ConversationId = conversation.Id,
                     MessageId = dialog.MessageId,
@@ -76,35 +75,20 @@ public class WelcomeHook : ConversationHookBase
                         LastName = "",
                         Role = AgentRole.Assistant
                     }
-                }, _options.JsonSerializerOptions);
+                };
 
                 await Task.Delay(300);
-
                 _storage.Append(conversation.Id, dialog);
-
-                await SendEvent(conversation.Id, json);
+                await SendEvent(ChatEvent.OnMessageReceivedFromAssistant, conversation.Id, data);
             }
         }
 
         await base.OnUserAgentConnectedInitially(conversation);
     }
 
-    private async Task SendEvent(string conversationId, string json)
+    private async Task SendEvent<T>(string @event, string conversationId, T data, [CallerMemberName] string callerName = "")
     {
-        try
-        {
-            if (_settings.EventDispatchBy == EventDispatchType.Group)
-            {
-                await _chatHub.Clients.Group(conversationId).SendAsync(RECEIVE_ASSISTANT_MESSAGE, json);
-            }
-            else
-            {
-                await _chatHub.Clients.User(_user.Id).SendAsync(RECEIVE_ASSISTANT_MESSAGE, json);
-            }
-        }
-        catch (Exception ex)
-        {
-            _logger.LogWarning(ex, $"Failed to send event in {nameof(WelcomeHook)} (conversation id: {conversationId}).");
-        }
+        var user = _services.GetRequiredService<IUserIdentity>();
+        await EventEmitter.SendChatEvent(_services, _logger, @event, conversationId, user?.Id, data, nameof(WelcomeHook), callerName);
     }
 }

src/Plugins/BotSharp.Plugin.ChatHub/Observers/ChatHubObserver.cs

@@ -1,113 +1,126 @@
 using BotSharp.Abstraction.Conversations.Dtos;
-using BotSharp.Abstraction.Observables.Models;
+using BotSharp.Abstraction.Conversations.Enums;
+using BotSharp.Abstraction.MessageHub.Models;
+using BotSharp.Abstraction.MessageHub.Observers;
 using BotSharp.Abstraction.SideCar;
-using BotSharp.Plugin.ChatHub.Hooks;
-using Microsoft.AspNetCore.SignalR;
+using System.Runtime.CompilerServices;
 
 namespace BotSharp.Plugin.ChatHub.Observers;
 
-public class ChatHubObserver : IObserver<HubObserveData>
+public class ChatHubObserver : BotSharpObserverBase<HubObserveData<RoleDialogModel>>
 {
     private readonly ILogger _logger;
-    private IServiceProvider _services;
+    private readonly IServiceProvider _services;
 
-    private const string BEFORE_RECEIVE_LLM_STREAM_MESSAGE = "BeforeReceiveLlmStreamMessage";
-    private const string ON_RECEIVE_LLM_STREAM_MESSAGE = "OnReceiveLlmStreamMessage";
-    private const string AFTER_RECEIVE_LLM_STREAM_MESSAGE = "AfterReceiveLlmStreamMessage";
-    private const string GENERATE_SENDER_ACTION = "OnSenderActionGenerated";
-
-    public ChatHubObserver(ILogger logger)
+    public ChatHubObserver(
+        IServiceProvider services,
+        ILogger<ChatHubObserver> logger) : base()
     {
+        _services = services;
         _logger = logger;
     }
 
-    public void OnCompleted()
+    public override string Name => nameof(ChatHubObserver);
+
+    public override void OnCompleted()
     {
         _logger.LogWarning($"{nameof(ChatHubObserver)} receives complete notification.");
     }
 
-    public void OnError(Exception error)
+    public override void OnError(Exception error)
     {
         _logger.LogError(error, $"{nameof(ChatHubObserver)} receives error notification: {error.Message}");
     }
 
-    public void OnNext(HubObserveData value)
+    public override void OnNext(HubObserveData<RoleDialogModel> value)
     {
-        _services = value.ServiceProvider;
-
-        if (!AllowSendingMessage()) return;
-
         var message = value.Data;
         var model = new ChatResponseDto();
-        if (value.EventName == BEFORE_RECEIVE_LLM_STREAM_MESSAGE)
+        var action = new ConversationSenderActionModel();
+        var conv = _services.GetRequiredService<IConversationService>();
+
+        switch (value.EventName)
         {
-            var conv = _services.GetRequiredService<IConversationService>();
-            model = new ChatResponseDto()
-            {
-                ConversationId = conv.ConversationId,
-                MessageId = message.MessageId,
-                Text = string.Empty,
-                Sender = new()
+            case ChatEvent.BeforeReceiveLlmStreamMessage:
+                if (!AllowSendingMessage()) return;
+
+                model = new ChatResponseDto()
                 {
-                    FirstName = "AI",
-                    LastName = "Assistant",
-                    Role = AgentRole.Assistant
-                }
-            };
+                    ConversationId = conv.ConversationId,
+                    MessageId = message.MessageId,
+                    Text = string.Empty,
+                    Sender = new()
+                    {
+                        FirstName = "AI",
+                        LastName = "Assistant",
+                        Role = AgentRole.Assistant
+                    }
+                };
 
-            var action = new ConversationSenderActionModel
-            {
-                ConversationId = conv.ConversationId,
-                SenderAction = SenderActionEnum.TypingOn
-            };
-
-            GenerateSenderAction(conv.ConversationId, action);
-        }
-        else if (value.EventName == AFTER_RECEIVE_LLM_STREAM_MESSAGE && message.IsStreaming)
-        {
-            var conv = _services.GetRequiredService<IConversationService>();
-            model = new ChatResponseDto()
-            {
-                ConversationId = conv.ConversationId,
-                MessageId = message.MessageId,
-                Text = message.Content,
-                Sender = new()
+                action = new ConversationSenderActionModel
                 {
-                    FirstName = "AI",
-                    LastName = "Assistant",
-                    Role = AgentRole.Assistant
-                }
-            };
+                    ConversationId = conv.ConversationId,
+                    SenderAction = SenderActionEnum.TypingOn
+                };
 
-            var action = new ConversationSenderActionModel
-            {
-                ConversationId = conv.ConversationId,
-                SenderAction = SenderActionEnum.TypingOff
-            };
+                SendEvent(ChatEvent.OnSenderActionGenerated, conv.ConversationId, action);
+                break;
+            case ChatEvent.OnReceiveLlmStreamMessage:
+                if (!AllowSendingMessage()) return;
 
-            GenerateSenderAction(conv.ConversationId, action);
-        }
-        else if (value.EventName == ON_RECEIVE_LLM_STREAM_MESSAGE)
-        {
-            var conv = _services.GetRequiredService<IConversationService>();
-            model = new ChatResponseDto()
-            {
-                ConversationId = conv.ConversationId,
-                MessageId = message.MessageId,
-                Text = !string.IsNullOrEmpty(message.SecondaryContent) ? message.SecondaryContent : message.Content,
-                Function = message.FunctionName,
-                RichContent = message.SecondaryRichContent ?? message.RichContent,
-                Data = message.Data,
-                Sender = new()
+                model = new ChatResponseDto()
                 {
-                    FirstName = "AI",
-                    LastName = "Assistant",
-                    Role = AgentRole.Assistant
-                }
-            };
+                    ConversationId = conv.ConversationId,
+                    MessageId = message.MessageId,
+                    Text = !string.IsNullOrEmpty(message.SecondaryContent) ? message.SecondaryContent : message.Content,
+                    Function = message.FunctionName,
+                    RichContent = message.SecondaryRichContent ?? message.RichContent,
+                    Data = message.Data,
+                    Sender = new()
+                    {
+                        FirstName = "AI",
+                        LastName = "Assistant",
+                        Role = AgentRole.Assistant
+                    }
+                };
+                break;
+            case ChatEvent.AfterReceiveLlmStreamMessage:
+                if (!AllowSendingMessage()) return;
+
+                model = new ChatResponseDto()
+                {
+                    ConversationId = conv.ConversationId,
+                    MessageId = message.MessageId,
+                    Text = message.Content,
+                    Sender = new()
+                    {
+                        FirstName = "AI",
+                        LastName = "Assistant",
+                        Role = AgentRole.Assistant
+                    }
+                };
+                break;
+            case ChatEvent.OnIndicationReceived:
+                model = new ChatResponseDto
+                {
+                    ConversationId = conv.ConversationId,
+                    MessageId = message.MessageId,
+                    Indication = message.Indication,
+                    Sender = new()
+                    {
+                        FirstName = "AI",
+                        LastName = "Assistant",
+                        Role = AgentRole.Assistant
+                    }
+                };
+
+#if DEBUG
+                _logger.LogCritical($"Receiving {value.EventName} ({value.Data.Indication}) in {nameof(ChatHubObserver)} - {conv.ConversationId}");
+#endif
+                break;
         }
 
-        OnReceiveAssistantMessage(value.EventName, model.ConversationId, model);
+        SendEvent(value.EventName, model.ConversationId, model);
     }
 
     private bool AllowSendingMessage()
@@ -116,48 +129,12 @@ public class ChatHubObserver : IObserver<HubObserveData>
         return sidecar == null || !sidecar.IsEnabled;
     }
 
-    private void OnReceiveAssistantMessage(string @event, string conversationId, ChatResponseDto model)
+    #region Private methods
+    private void SendEvent<T>(string @event, string conversationId, T data, [CallerMemberName] string callerName = "")
     {
-        try
-        {
-            var settings = _services.GetRequiredService<ChatHubSettings>();
-            var chatHub = _services.GetRequiredService<IHubContext<SignalRHub>>();
-
-            if (settings.EventDispatchBy == EventDispatchType.Group)
-            {
-                chatHub.Clients.Group(conversationId).SendAsync(@event, model).ConfigureAwait(false).GetAwaiter().GetResult();
-            }
-            else
-            {
-                var user = _services.GetRequiredService<IUserIdentity>();
-                chatHub.Clients.User(user.Id).SendAsync(@event, model).ConfigureAwait(false).GetAwaiter().GetResult();
-            }
-        }
-        catch (Exception ex)
-        {
-            _logger.LogWarning(ex, $"Failed to receive assistant message in {nameof(ChatHubConversationHook)} (conversation id: {conversationId})");
-        }
-    }
-
-    private void GenerateSenderAction(string conversationId, ConversationSenderActionModel action)
-    {
-        try
-        {
-            var settings = _services.GetRequiredService<ChatHubSettings>();
-            var chatHub = _services.GetRequiredService<IHubContext<SignalRHub>>();
-            if (settings.EventDispatchBy == EventDispatchType.Group)
-            {
-                chatHub.Clients.Group(conversationId).SendAsync(GENERATE_SENDER_ACTION, action).ConfigureAwait(false).GetAwaiter().GetResult();
-            }
-            else
-            {
-                var user = _services.GetRequiredService<IUserIdentity>();
-                chatHub.Clients.User(user.Id).SendAsync(GENERATE_SENDER_ACTION, action).ConfigureAwait(false).GetAwaiter().GetResult();
-            }
-        }
-        catch (Exception ex)
-        {
-            _logger.LogWarning(ex, $"Failed to generate sender action in {nameof(ChatHubConversationHook)} (conversation id: {conversationId})");
-        }
+        var user = _services.GetRequiredService<IUserIdentity>();
+        EventEmitter.SendChatEvent(_services, _logger, @event, conversationId, user?.Id, data, nameof(ChatHubObserver), callerName)
+                     .ConfigureAwait(false).GetAwaiter().GetResult();
     }
+    #endregion
 }

src/Plugins/BotSharp.Plugin.ChatHub/Using.cs

@@ -35,3 +35,4 @@ global using BotSharp.Abstraction.Realtime.Models;
 global using BotSharp.Plugin.ChatHub.Settings;
 global using BotSharp.Plugin.ChatHub.Enums;
 global using BotSharp.Plugin.ChatHub.Models.Stream;
+global using BotSharp.Plugin.ChatHub.Helpers;

src/Plugins/BotSharp.Plugin.DeepSeekAI/Providers/Chat/ChatCompletionProvider.cs

@@ -1,8 +1,9 @@
+using BotSharp.Abstraction.Conversations.Enums;
 using BotSharp.Abstraction.Files;
 using BotSharp.Abstraction.Hooks;
-using BotSharp.Abstraction.Observables.Models;
+using BotSharp.Abstraction.MessageHub.Models;
 using BotSharp.Core.Infrastructures.Streams;
-using BotSharp.Core.Observables.Queues;
+using BotSharp.Core.MessageHub;
 using BotSharp.Plugin.DeepSeek.Providers;
 using Microsoft.Extensions.Logging;
 using OpenAI.Chat;
@@ -179,7 +180,8 @@ public class ChatCompletionProvider : IChatCompletion
         var chatClient = client.GetChatClient(_model);
         var (prompt, messages, options) = PrepareOptions(agent, conversations);
 
-        var hub = _services.GetRequiredService<MessageHub<HubObserveData>>();
+        var hub = _services.GetRequiredService<MessageHub<HubObserveData<RoleDialogModel>>>();
+        var conv = _services.GetRequiredService<IConversationService>();
         var messageId = conversations.LastOrDefault()?.MessageId ?? string.Empty;
 
         var contentHooks = _services.GetHooks<IContentGeneratingHook>(agent.Id);
@@ -191,8 +193,8 @@ public class ChatCompletionProvider : IChatCompletion
 
         hub.Push(new()
         {
-            ServiceProvider = _services,
-            EventName = "BeforeReceiveLlmStreamMessage",
+            EventName = ChatEvent.BeforeReceiveLlmStreamMessage,
+            RefId = conv.ConversationId,
             Data = new RoleDialogModel(AgentRole.Assistant, string.Empty)
             {
                 CurrentAgentId = agent.Id,
@@ -235,8 +237,8 @@ public class ChatCompletionProvider : IChatCompletion
                 };
                 hub.Push(new()
                 {
-                    ServiceProvider = _services,
-                    EventName = "OnReceiveLlmStreamMessage",
+                    EventName = ChatEvent.OnReceiveLlmStreamMessage,
+                    RefId = conv.ConversationId,
                     Data = content
                 });
             }
@@ -278,8 +280,8 @@ public class ChatCompletionProvider : IChatCompletion
 
         hub.Push(new()
         {
-            ServiceProvider = _services,
-            EventName = "AfterReceiveLlmStreamMessage",
+            EventName = ChatEvent.AfterReceiveLlmStreamMessage,
+            RefId = conv.ConversationId,
             Data = responseMessage
         });
 

src/Plugins/BotSharp.Plugin.KnowledgeBase/Services/KnowledgeService.Vector.cs

@@ -33,31 +33,30 @@ public partial class KnowledgeService
                 return false;
             }
 
-            var vectorDb = GetVectorDb();
-            var created = await vectorDb.CreateCollection(collectionName, dimension);
+            var db = _services.GetRequiredService<IBotSharpRepository>();
+            var created = db.AddKnowledgeCollectionConfigs(new List<VectorCollectionConfig>
+            {
+                new VectorCollectionConfig
+                {
+                    Name = collectionName,
+                    Type = collectionType,
+                    VectorStore = new VectorStoreConfig
+                    {
+                        Provider = _settings.VectorDb.Provider
+                    },
+                    TextEmbedding = new KnowledgeEmbeddingConfig
+                    {
+                        Provider = provider,
+                        Model = model,
+                        Dimension = dimension
+                    }
+                }
+            });
+
             if (created)
             {
-                var db = _services.GetRequiredService<IBotSharpRepository>();
-                var userId = await GetUserId();
-
-                db.AddKnowledgeCollectionConfigs(new List<VectorCollectionConfig>
-                {
-                    new VectorCollectionConfig
-                    {
-                        Name = collectionName,
-                        Type = collectionType,
-                        VectorStore = new VectorStoreConfig
-                        {
-                            Provider = _settings.VectorDb.Provider
-                        },
-                        TextEmbedding = new KnowledgeEmbeddingConfig
-                        {
-                            Provider = provider,
-                            Model = model,
-                            Dimension = dimension
-                        }
-                    }
-                });
+                var vectorDb = GetVectorDb();
+                created = await vectorDb.CreateCollection(collectionName, dimension);
             }
 
             return created;

src/Plugins/BotSharp.Plugin.LLamaSharp/Providers/ChatCompletionProvider.cs

@@ -1,9 +1,10 @@
 using BotSharp.Abstraction.Agents;
+using BotSharp.Abstraction.Conversations.Enums;
 using BotSharp.Abstraction.Hooks;
 using BotSharp.Abstraction.Loggers;
-using BotSharp.Abstraction.Observables.Models;
+using BotSharp.Abstraction.MessageHub.Models;
 using BotSharp.Core.Infrastructures.Streams;
-using BotSharp.Core.Observables.Queues;
+using BotSharp.Core.MessageHub;
 using Microsoft.AspNetCore.SignalR;
 using static LLama.Common.ChatHistory;
 using static System.Net.Mime.MediaTypeNames;
@@ -183,13 +184,14 @@ public class ChatCompletionProvider : IChatCompletion
             _logger.LogInformation(agent.Instruction);
         }
 
-        var hub = _services.GetRequiredService<MessageHub<HubObserveData>>();
+        var hub = _services.GetRequiredService<MessageHub<HubObserveData<RoleDialogModel>>>();
+        var conv = _services.GetRequiredService<IConversationService>();
         var messageId = conversations.LastOrDefault()?.MessageId ?? string.Empty;
 
         hub.Push(new()
         {
-            ServiceProvider = _services,
-            EventName = "BeforeReceiveLlmStreamMessage",
+            EventName = ChatEvent.BeforeReceiveLlmStreamMessage,
+            RefId = conv.ConversationId,
             Data = new RoleDialogModel(AgentRole.Assistant, string.Empty)
             {
                 CurrentAgentId = agent.Id,
@@ -216,8 +218,8 @@ public class ChatCompletionProvider : IChatCompletion
             };
             hub.Push(new()
             {
-                ServiceProvider = _services,
-                EventName = "OnReceiveLlmStreamMessage",
+                EventName = ChatEvent.OnReceiveLlmStreamMessage,
+                RefId = conv.ConversationId,
                 Data = content
             });
         }
@@ -231,8 +233,8 @@ public class ChatCompletionProvider : IChatCompletion
 
         hub.Push(new()
         {
-            ServiceProvider = _services,
-            EventName = "AfterReceiveLlmStreamMessage",
+            EventName = ChatEvent.AfterReceiveLlmStreamMessage,
+            RefId = conv.ConversationId,
             Data = responseMessage
         });
 

src/Plugins/BotSharp.Plugin.OpenAI/Providers/Chat/ChatCompletionProvider.cs

@@ -1,10 +1,7 @@
-using Azure;
 using BotSharp.Abstraction.Hooks;
-using BotSharp.Abstraction.Observables.Models;
+using BotSharp.Abstraction.MessageHub.Models;
 using BotSharp.Core.Infrastructures.Streams;
-using BotSharp.Core.Observables.Queues;
-using BotSharp.Plugin.OpenAI.Models.Realtime;
-using Fluid;
+using BotSharp.Core.MessageHub;
 using OpenAI.Chat;
 
 namespace BotSharp.Plugin.OpenAI.Providers.Chat;
@@ -191,7 +188,8 @@ public class ChatCompletionProvider : IChatCompletion
         var chatClient = client.GetChatClient(_model);
         var (prompt, messages, options) = PrepareOptions(agent, conversations);
 
-        var hub = _services.GetRequiredService<MessageHub<HubObserveData>>();
+        var hub = _services.GetRequiredService<MessageHub<HubObserveData<RoleDialogModel>>>();
+        var conv = _services.GetRequiredService<IConversationService>();
         var messageId = conversations.LastOrDefault()?.MessageId ?? string.Empty;
 
         var contentHooks = _services.GetHooks<IContentGeneratingHook>(agent.Id);
@@ -203,8 +201,8 @@ public class ChatCompletionProvider : IChatCompletion
 
         hub.Push(new()
         {
-            ServiceProvider = _services,
-            EventName = "BeforeReceiveLlmStreamMessage",
+            EventName = ChatEvent.BeforeReceiveLlmStreamMessage,
+            RefId = conv.ConversationId,
             Data = new RoleDialogModel(AgentRole.Assistant, string.Empty)
             {
                 CurrentAgentId = agent.Id,
@@ -247,8 +245,8 @@ public class ChatCompletionProvider : IChatCompletion
                 };
                 hub.Push(new()
                 {
-                    ServiceProvider = _services,
-                    EventName = "OnReceiveLlmStreamMessage",
+                    EventName = ChatEvent.OnReceiveLlmStreamMessage,
+                    RefId = conv.ConversationId,
                     Data = content
                 });
             }
@@ -290,8 +288,8 @@ public class ChatCompletionProvider : IChatCompletion
 
         hub.Push(new()
         {
-            ServiceProvider = _services,
-            EventName = "AfterReceiveLlmStreamMessage",
+            EventName = ChatEvent.AfterReceiveLlmStreamMessage,
+            RefId = conv.ConversationId,
             Data = responseMessage
         });
 

src/Plugins/BotSharp.Plugin.SparkDesk/Providers/ChatCompletionProvider.cs

@@ -1,10 +1,11 @@
 using BotSharp.Abstraction.Agents;
 using BotSharp.Abstraction.Agents.Enums;
+using BotSharp.Abstraction.Conversations;
+using BotSharp.Abstraction.Conversations.Enums;
 using BotSharp.Abstraction.Loggers;
-using BotSharp.Abstraction.Observables.Models;
+using BotSharp.Abstraction.MessageHub.Models;
 using BotSharp.Core.Infrastructures.Streams;
-using BotSharp.Core.Observables.Queues;
-using Microsoft.AspNetCore.SignalR;
+using BotSharp.Core.MessageHub;
 
 namespace BotSharp.Plugin.SparkDesk.Providers;
 
@@ -152,12 +153,13 @@ public class ChatCompletionProvider : IChatCompletion
         var client = new SparkDeskClient(appId: _settings.AppId, apiKey: _settings.ApiKey, apiSecret: _settings.ApiSecret);
         var (prompt, messages, funcall) = PrepareOptions(agent, conversations);
         var messageId = conversations.LastOrDefault()?.MessageId ?? string.Empty;
-        var hub = _services.GetRequiredService<MessageHub<HubObserveData>>();
+        var hub = _services.GetRequiredService<MessageHub<HubObserveData<RoleDialogModel>>>();
+        var conv = _services.GetRequiredService<IConversationService>();
 
         hub.Push(new()
         {
-            ServiceProvider = _services,
-            EventName = "BeforeReceiveLlmStreamMessage",
+            EventName = ChatEvent.BeforeReceiveLlmStreamMessage,
+            RefId = conv.ConversationId,
             Data = new RoleDialogModel(AgentRole.Assistant, string.Empty)
             {
                 CurrentAgentId = agent.Id,
@@ -197,8 +199,8 @@ public class ChatCompletionProvider : IChatCompletion
 
                 hub.Push(new()
                 {
-                    ServiceProvider = _services,
-                    EventName = "OnReceiveLlmStreamMessage",
+                    EventName = ChatEvent.OnReceiveLlmStreamMessage,
+                    RefId = conv.ConversationId,
                     Data = responseMessage
                 });
             } 
@@ -212,8 +214,8 @@ public class ChatCompletionProvider : IChatCompletion
 
         hub.Push(new()
         {
-            ServiceProvider = _services,
-            EventName = "AfterReceiveLlmStreamMessage",
+            EventName = ChatEvent.AfterReceiveLlmStreamMessage,
+            RefId = conv.ConversationId,
             Data = responseMessage
         });
 

src/Plugins/BotSharp.Plugin.Twilio/Hooks/TwilioConversationHook.cs

@@ -1,6 +1,7 @@
 using BotSharp.Abstraction.Hooks;
 using BotSharp.Abstraction.Routing;
 using BotSharp.Abstraction.Routing.Enums;
+using BotSharp.Abstraction.Routing.Models;
 using BotSharp.Plugin.Twilio.Interfaces;
 using BotSharp.Plugin.Twilio.Models;
 using Twilio.Rest.Api.V2010.Account;
@@ -23,7 +24,7 @@ public class TwilioConversationHook : ConversationHookBase, IConversationHook
         _logger = logger;
     }
 
-    public override async Task OnFunctionExecuted(RoleDialogModel message, string from = InvokeSource.Manual)
+    public override async Task OnFunctionExecuted(RoleDialogModel message, InvokeFunctionOptions? options = null)
     {
         var hooks = _services.GetHooks<ITwilioSessionHook>(message.CurrentAgentId);
 

src/Plugins/BotSharp.Plugin.Twilio/Services/TwilioMessageQueueService.cs

@@ -1,4 +1,6 @@
 using BotSharp.Abstraction.Files;
+using BotSharp.Abstraction.MessageHub.Models;
+using BotSharp.Abstraction.MessageHub.Services;
 using BotSharp.Abstraction.Realtime;
 using BotSharp.Abstraction.Routing;
 using BotSharp.Core.Infrastructures;
@@ -82,8 +84,12 @@ public class TwilioMessageQueueService : BackgroundService
         var routing = sp.GetRequiredService<IRoutingService>();
         var config = sp.GetRequiredService<TwilioSetting>();
         var sessionManager = sp.GetRequiredService<ITwilioSessionManager>();
-        var progressService = sp.GetRequiredService<IConversationProgressService>();
-        InitProgressService(message, sessionManager, progressService);
+        var observer = sp.GetRequiredService<IObserverService>();
+
+        using var container = observer.SubscribeObservers<HubObserveData<RoleDialogModel>>(message.ConversationId, listeners: new()
+        {
+            { ChatEvent.OnIndicationReceived, async data => await OnReceiveToolCallIndication(data.Data, message, sessionManager) }
+        });
         InitConversation(message, inputMsg, conv, routing);
 
         // Need to consider Inbound and Outbound call
@@ -185,15 +191,11 @@ public class TwilioMessageQueueService : BackgroundService
         return string.Join(", ", hints.Select(x => x.ToLower()).Distinct().Reverse());
     }
 
-    private static void InitProgressService(CallerMessage message, ITwilioSessionManager sessionManager, IConversationProgressService progressService)
+    private static async Task OnReceiveToolCallIndication(RoleDialogModel msg, CallerMessage message, ITwilioSessionManager sessionManager)
     {
-        progressService.OnFunctionExecuting = async msg =>
+        if (!string.IsNullOrEmpty(msg.Indication))
         {
-            if (!string.IsNullOrEmpty(msg.Indication))
-            {
-                await sessionManager.SetReplyIndicationAsync(message.ConversationId, message.SeqNumber, msg.Indication);
-            }
-        };
-        progressService.OnFunctionExecuted = async msg => { };
+            await sessionManager.SetReplyIndicationAsync(message.ConversationId, message.SeqNumber, msg.Indication);
+        }
     }
 }