| | | 1 | | using System.Collections.Concurrent; |
| | | 2 | | using EHonda.KicktippAi.Core; |
| | | 3 | | using Microsoft.Extensions.Logging; |
| | | 4 | | using OpenAI.Chat; |
| | | 5 | | using OpenAiIntegration; |
| | | 6 | | |
| | | 7 | | namespace Orchestrator.Infrastructure.Factories; |
| | | 8 | | |
| | | 9 | | /// <summary> |
| | | 10 | | /// Default implementation of <see cref="IOpenAiServiceFactory"/>. |
| | | 11 | | /// </summary> |
| | | 12 | | /// <remarks> |
| | | 13 | | /// Reads the API key from OPENAI_API_KEY environment variable. |
| | | 14 | | /// Caches services by model to avoid recreating them for repeated requests. |
| | | 15 | | /// The <see cref="ITokenUsageTracker"/> is shared across all prediction services. |
| | | 16 | | /// </remarks> |
| | | 17 | | public sealed class OpenAiServiceFactory : IOpenAiServiceFactory |
| | | 18 | | { |
| | | 19 | | private readonly ILoggerFactory _loggerFactory; |
| | | 20 | | private readonly Lazy<string> _apiKey; |
| | 1 | 21 | | private readonly ConcurrentDictionary<string, IPredictionService> _predictionServiceCache = new(); |
| | | 22 | | private ITokenUsageTracker? _tokenUsageTracker; |
| | | 23 | | private ICostCalculationService? _costCalculationService; |
| | | 24 | | private IInstructionsTemplateProvider? _instructionsTemplateProvider; |
| | 1 | 25 | | private readonly object _lock = new(); |
| | | 26 | | |
| | 1 | 27 | | public OpenAiServiceFactory(ILoggerFactory loggerFactory) |
| | | 28 | | { |
| | 1 | 29 | | _loggerFactory = loggerFactory; |
| | 1 | 30 | | _apiKey = new Lazy<string>(GetApiKeyFromEnvironment); |
| | 1 | 31 | | } |
| | | 32 | | |
| | | 33 | | /// <inheritdoc /> |
| | | 34 | | public IPredictionService CreatePredictionService(string model) |
| | | 35 | | { |
| | 1 | 36 | | ArgumentException.ThrowIfNullOrWhiteSpace(model); |
| | | 37 | | |
| | 1 | 38 | | var apiKey = _apiKey.Value; |
| | | 39 | | |
| | | 40 | | // Cache key includes model to handle different configurations |
| | 1 | 41 | | return _predictionServiceCache.GetOrAdd(model, _ => |
| | 1 | 42 | | { |
| | 1 | 43 | | var logger = _loggerFactory.CreateLogger<PredictionService>(); |
| | 1 | 44 | | var chatClient = new ChatClient(model, apiKey); |
| | 1 | 45 | | |
| | 1 | 46 | | return new PredictionService( |
| | 1 | 47 | | chatClient, |
| | 1 | 48 | | logger, |
| | 1 | 49 | | GetOrCreateCostCalculationService(), |
| | 1 | 50 | | GetTokenUsageTracker(), |
| | 1 | 51 | | GetOrCreateInstructionsTemplateProvider(), |
| | 1 | 52 | | model); |
| | 1 | 53 | | }); |
| | | 54 | | } |
| | | 55 | | |
| | | 56 | | /// <inheritdoc /> |
| | | 57 | | public ITokenUsageTracker GetTokenUsageTracker() |
| | | 58 | | { |
| | 1 | 59 | | if (_tokenUsageTracker == null) |
| | | 60 | | { |
| | 1 | 61 | | lock (_lock) |
| | | 62 | | { |
| | 1 | 63 | | _tokenUsageTracker ??= new TokenUsageTracker( |
| | 1 | 64 | | _loggerFactory.CreateLogger<TokenUsageTracker>(), |
| | 1 | 65 | | GetOrCreateCostCalculationService()); |
| | 1 | 66 | | } |
| | | 67 | | } |
| | | 68 | | |
| | 1 | 69 | | return _tokenUsageTracker; |
| | | 70 | | } |
| | | 71 | | |
| | | 72 | | private static string GetApiKeyFromEnvironment() |
| | | 73 | | { |
| | 1 | 74 | | var apiKey = Environment.GetEnvironmentVariable("OPENAI_API_KEY"); |
| | 1 | 75 | | if (string.IsNullOrWhiteSpace(apiKey)) |
| | | 76 | | { |
| | 1 | 77 | | throw new InvalidOperationException("OPENAI_API_KEY environment variable is required"); |
| | | 78 | | } |
| | | 79 | | |
| | 1 | 80 | | return apiKey; |
| | | 81 | | } |
| | | 82 | | |
| | | 83 | | private ICostCalculationService GetOrCreateCostCalculationService() |
| | | 84 | | { |
| | 1 | 85 | | if (_costCalculationService == null) |
| | | 86 | | { |
| | 1 | 87 | | lock (_lock) |
| | | 88 | | { |
| | 1 | 89 | | _costCalculationService ??= new CostCalculationService( |
| | 1 | 90 | | _loggerFactory.CreateLogger<CostCalculationService>()); |
| | 1 | 91 | | } |
| | | 92 | | } |
| | | 93 | | |
| | 1 | 94 | | return _costCalculationService; |
| | | 95 | | } |
| | | 96 | | |
| | | 97 | | private IInstructionsTemplateProvider GetOrCreateInstructionsTemplateProvider() |
| | | 98 | | { |
| | 1 | 99 | | if (_instructionsTemplateProvider == null) |
| | | 100 | | { |
| | 1 | 101 | | lock (_lock) |
| | | 102 | | { |
| | 1 | 103 | | _instructionsTemplateProvider ??= new InstructionsTemplateProvider( |
| | 1 | 104 | | PromptsFileProvider.Create()); |
| | 1 | 105 | | } |
| | | 106 | | } |
| | | 107 | | |
| | 1 | 108 | | return _instructionsTemplateProvider; |
| | | 109 | | } |
| | | 110 | | } |