Add OpenAISettingsBuilder

.gitignore

@@ -483,12 +483,16 @@ $RECYCLE.BIN/
 # Vim temporary swap files
 *.swp
 
+# Project-specific
 *.bak
 *.org
 
 appsettings.Development.json
 appsettings.Production.json
 
+# Live Unit Testing
+*.lutconfig
+
 # azd
 .azure
 

src/AzureOpenAIProxy.ApiApp/Builders/OpenAISettingsBuilder.cs

@@ -0,0 +1,43 @@
+using AzureOpenAIProxy.ApiApp.Configurations;
+
+namespace AzureOpenAIProxy.ApiApp.Builders;
+
+/// <summary>
+/// This provides interface to the <see cref="OpenAISettingsBuilder"/> class.
+/// </summary>
+public interface IOpenAISettingsBuilder
+{
+    /// <summary>
+    /// Sets the list of <see cref="OpenAIInstanceSettings"/> instances.
+    /// </summary>
+    /// <param name="instances">List of <see cref="OpenAIInstanceSettings"/> instances.</param>
+    void SetOpenAIInstances(IEnumerable<OpenAIInstanceSettings>? instances);
+
+    /// <summary>
+    /// Builds the <see cref="OpenAISettings"/> instance.
+    /// </summary>
+    /// <returns>Returns the <see cref="OpenAISettings"/> instance.</returns>
+    OpenAISettings Build();
+}
+
+/// <summary>
+/// This represents the builder entity for <see cref="OpenAISettings"/> class.
+/// </summary>
+public class OpenAISettingsBuilder : IOpenAISettingsBuilder
+{
+    private IEnumerable<OpenAIInstanceSettings>? _instances;
+
+    /// <inheritdoc />
+    public void SetOpenAIInstances(IEnumerable<OpenAIInstanceSettings>? instances)
+    {
+        this._instances = instances;
+    }
+
+    /// <inheritdoc />
+    public OpenAISettings Build()
+    {
+        var settings = new OpenAISettings() { Instances = (this._instances ?? []).ToList() };
+
+        return settings;
+    }
+}

src/AzureOpenAIProxy.ApiApp/Extensions/ServiceCollectionExtensions.cs

@@ -16,10 +16,15 @@ public static class ServiceCollectionExtensions
     /// </summary>
     /// <param name="services"><see cref="IServiceCollection"/> instance.</param>
     /// <returns>Returns <see cref="IServiceCollection"/> instance.</returns>
-    public static IServiceCollection AddOpenAISettingsFromAppSettings(this IServiceCollection services)
+    public static IServiceCollection AddOpenAISettings(this IServiceCollection services)
     {
         services.AddSingleton<OpenAISettings>(sp =>
         {
+            //var settings = new OpenAISettingsBuilder()
+            //                   .WithAppSettings(sp)
+            //                   .WithKeyVault(sp)
+            //                   .Build();
+
             var configuration = sp.GetService<IConfiguration>()
                 ?? throw new InvalidOperationException($"{nameof(IConfiguration)} service is not registered.");
 
@@ -39,7 +44,7 @@ public static IServiceCollection AddOpenAISettingsFromAppSettings(this IServiceC
     /// <returns>Returns <see cref="IServiceCollection"/> instance.</returns>
     public static IServiceCollection AddOpenAIService(this IServiceCollection services)
     {
-        services.AddOpenAISettingsFromAppSettings();
+        services.AddOpenAISettings();
         services.AddHttpClient<IOpenAIService, OpenAIService>();
 
         return services;

test/AzureOpenAIProxy.ApiApp.Tests/Builders/OpenAISettingsBuilderTests.cs

@@ -0,0 +1,70 @@
+using AzureOpenAIProxy.ApiApp.Builders;
+using AzureOpenAIProxy.ApiApp.Configurations;
+
+using FluentAssertions;
+
+namespace AzureOpenAIProxy.ApiApp.Tests.Builders;
+
+public class OpenAISettingsBuilderTests
+{
+    [Fact]
+    public void Given_OpenAISettingsBuilder_When_Invoked_Build_Then_It_Should_Return_Instance()
+    {
+        // Arrange
+        var builder = new OpenAISettingsBuilder();
+
+        // Act
+        var result = builder.Build();
+
+        // Assert
+        result.Should().NotBeNull()
+                   .And.BeOfType<OpenAISettings>();
+    }
+
+    [Fact]
+    public void Given_OpenAISettingsBuilder_When_Invoked_Build_Then_It_Should_Return_Empty()
+    {
+        // Arrange
+        var builder = new OpenAISettingsBuilder();
+
+        // Act
+        var result = builder.Build();
+
+        // Assert
+        result.Instances.Should().NotBeNull()
+                             .And.BeEmpty();
+    }
+
+    [Theory]
+    [InlineData(0)]
+    [InlineData(1)]
+    [InlineData(10)]
+    public void Given_OpenAISettingsBuilder_When_Invoked_SetOpenAIInstances_Then_It_Should_Set_Instances(int count)
+    {
+        // Arrange
+        var builder = new OpenAISettingsBuilder();
+        var instances = Enumerable.Range(0, count).Select(p => new OpenAIInstanceSettings()).ToList();
+
+        // Act
+        builder.SetOpenAIInstances(instances);
+        var result = builder.Build();
+
+        // Assert
+        result.Instances.Should().HaveCount(count);
+    }
+
+    [Fact]
+    public void Given_OpenAISettingsBuilder_When_Invoked_SetOpenAIInstances_Then_It_Should_Return_Empty()
+    {
+        // Arrange
+        var builder = new OpenAISettingsBuilder();
+
+        // Act
+        builder.SetOpenAIInstances(null);
+        var result = builder.Build();
+
+        // Assert
+        result.Instances.Should().NotBeNull()
+                             .And.BeEmpty();
+    }
+}