fix: update LMStudio API Endpoint and added model name support (#4732)

* fix: update LMStudio API Endpoint and added model name support

* fix: ensure modelName non-null

* fix: add braces around if branch

---------

Co-authored-by: Ryan Sweet <[email protected]>
Co-authored-by: Xiaoyun Zhang <[email protected]>

dotnet/src/AutoGen/LMStudioConfig.cs

@@ -13,18 +13,28 @@ namespace AutoGen;
 /// </summary>
 public class LMStudioConfig : ILLMConfig
 {
-    public LMStudioConfig(string host, int port)
+    public LMStudioConfig(string host, int port, string modelName)
     {
         this.Host = host;
         this.Port = port;
-        this.Uri = new Uri($"http://{host}:{port}");
+        this.Uri = new Uri($"http://{host}:{port}/v1");
+        if (modelName == null)
+        {
+            throw new ArgumentNullException("modelName is a required property for LMStudioConfig and cannot be null");
+        }
+        this.ModelName = modelName;
     }
 
-    public LMStudioConfig(Uri uri)
+    public LMStudioConfig(Uri uri, string modelName)
     {
         this.Uri = uri;
         this.Host = uri.Host;
         this.Port = uri.Port;
+        if (modelName == null)
+        {
+            throw new ArgumentNullException("modelName is a required property for LMStudioConfig and cannot be null");
+        }
+        this.ModelName = modelName;
     }
 
     public string Host { get; }
@@ -33,15 +43,15 @@ public LMStudioConfig(Uri uri)
 
     public Uri Uri { get; }
 
+    public string ModelName { get; }
+
     internal ChatClient CreateChatClient()
     {
         var client = new OpenAIClient(new ApiKeyCredential("api-key"), new OpenAIClientOptions
         {
             Endpoint = this.Uri,
         });
 
-        // model name doesn't matter for LM Studio
-
-        return client.GetChatClient("model-name");
+        return client.GetChatClient(this.ModelName);
     }
 }