♻️ Replace the LangChain with Semantic Kernel

DysonNetwork.Insight/Thinking/ThinkingController.cs

@@ -1,8 +1,9 @@
 using System.ComponentModel.DataAnnotations;
-using LangChain.Providers;
 using Microsoft.AspNetCore.Mvc;
+using Microsoft.SemanticKernel.ChatCompletion;
 using System.Text;
-using CSharpToJsonSchema;
+using Microsoft.SemanticKernel;
+using Microsoft.SemanticKernel.Connectors.Ollama;
 
 namespace DysonNetwork.Insight.Thinking;
 
@@ -22,74 +23,42 @@ public class ThinkingController(ThinkingProvider provider) : ControllerBase
         Response.Headers.Append("Content-Type", "text/event-stream");
         Response.StatusCode = 200;
 
-        var model = provider.GetModel();
+        var kernel = provider.Kernel;
 
-        // Build conversation history (you may load from your memory store)
-        var messages = new List<Message>
-        {
-            new Message
-            {
-                Role = MessageRole.System,
-                Content =
-                    "You're a helpful assistant on the Solar Network, a social network. Your name is Sn-chan, a cute sweet heart with passion for almost everything."
-            },
-            new Message
-            {
-                Role = MessageRole.Human,
-                Content = request.UserMessage
-            }
-        };
+        var chatCompletionService = kernel.GetRequiredService<IChatCompletionService>();
 
-        // Mock tool definitions — you will replace these with your real tool calls
-        Func<string, Task<string>> getUserProfileAsync = async (userId) =>
-        {
-            // MOCK: simulate fetching user profile
-            await Task.Delay(100); // simulate async work
-            return $"{{\"userId\":\"{userId}\",\"name\":\"MockUser\",\"bio\":\"Loves music and tech.\"}}";
-        };
-
-        Func<string, Task<string>> getRecentPostsAsync = async (topic) =>
-        {
-            // MOCK: simulate fetching recent posts
-            await Task.Delay(200);
-            return
-                $"[{{\"postId\":\"p1\",\"topic\":\"{topic}\",\"content\":\"Mock post content 1.\"}} , {{\"postId\":\"p2\",\"topic\":\"{topic}\",\"content\":\"Mock post content 2.\"}}]";
-        };
-
-        // You might pass these tools into your model/agent context
-        // (Assuming your LangChain .NET version supports tool-binding; adapt as needed.)
+        var chatHistory = new ChatHistory(
+            "You're a helpful assistant on the Solar Network, a social network.\n" +
+            "Your name is Sn-chan, a cute sweet heart with passion for almost everything.\n" +
+            "\n" +
+            "Your aim is to helping solving questions for the users on the Solar Network.\n" +
+            "And the Solar Network is the social network platform you live on.\n" +
+            "When the user ask questions about the Solar Network (also known as SN and Solian), try use the tools you have to get latest and accurate data."
+        );
+        chatHistory.AddUserMessage(request.UserMessage);
 
         // Kick off streaming generation
         var accumulatedContent = new StringBuilder();
-        await foreach (var chunk in model.GenerateAsync(
-                           new ChatRequest
+        await foreach (var chunk in chatCompletionService.GetStreamingChatMessageContentsAsync(
+                           chatHistory,
+                           new OllamaPromptExecutionSettings
                            {
-                               Messages = messages,
-                               Tools =
-                               [
-                                   new Tool
+                               FunctionChoiceBehavior = FunctionChoiceBehavior.Auto(
+                                   options: new FunctionChoiceBehaviorOptions()
                                    {
-                                       Name = "get_user_profile",
-                                       Description = "Get a user profile from the Solar Network."
-                                   },
-                                   new Tool
-                                   {
-                                       Name = "get_recent_posts",
-                                       Description = "Get recent posts from the Solar Network."
-                                   }
-                               ]
+                                       AllowParallelCalls = true,
+                                       AllowConcurrentInvocation = true
+                                   })
                            },
-                           new ChatSettings { UseStreaming = true }
+                           kernel: kernel
                        ))
         {
             // Write each chunk to the HTTP response as SSE
-            var data = chunk.LastMessageContent;
+            var data = chunk.Content ?? "";
             accumulatedContent.Append(data);
-            var sb = new StringBuilder();
-            sb.Append("data: ");
-            sb.AppendLine(accumulatedContent.ToString().Replace("\n", "\ndata: "));
-            sb.AppendLine(); // the blank line terminates the chunk
-            var bytes = Encoding.UTF8.GetBytes(sb.ToString());
+            if (string.IsNullOrEmpty(data)) continue;
+
+            var bytes = Encoding.UTF8.GetBytes(data);
             await Response.Body.WriteAsync(bytes);
             await Response.Body.FlushAsync();
         }