BioGTK.AI.OllamaChatService Class Reference

Public Member Functions
	OllamaChatService (HttpClient httpClient, string baseUrl="http://localhost:11434")
async Task< string >	GetResponseAsync (string systemPrompt, string userPrompt, CancellationToken cancellationToken=default)

Detailed Description

Definition at line 102 of file AI.cs.

Constructor & Destructor Documentation

OllamaChatService()

BioGTK.AI.OllamaChatService.OllamaChatService	(	HttpClient	httpClient,
		string	baseUrl = "http://localhost:11434" )

Definition at line 107 of file AI.cs.

                                                                                  ://localhost:11434")
            {
                _httpClient = httpClient ?? throw new ArgumentNullException(nameof(httpClient));
                _httpClient.Timeout = TimeSpan.FromMinutes(60);
                if (_httpClient.BaseAddress == null)
                    _httpClient.BaseAddress = new Uri(baseUrl);
 
                // ✅ Use attributes for naming instead of a broken SnakeCase policy
                _jsonOptions = new JsonSerializerOptions
                {
                    PropertyNamingPolicy = null, // respect [JsonPropertyName] attributes
                    DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
                    WriteIndented = false
                };
            }

Member Function Documentation

GetResponseAsync()

async Task< string > BioGTK.AI.OllamaChatService.GetResponseAsync	(	string	systemPrompt,
		string	userPrompt,
		CancellationToken	cancellationToken = default )

Definition at line 123 of file AI.cs.

            {
                var request = new ChatRequest(
                    Model: "gpt-oss",
                    Messages: new[]
                    {
                new ChatMessage("system", systemPrompt),
                new ChatMessage("user", userPrompt)
                    });
 
                var json = JsonSerializer.Serialize(request, _jsonOptions);
                using var content = new StringContent(json, Encoding.UTF8, "application/json");
 
                using var timeoutCts = new CancellationTokenSource(TimeSpan.FromMinutes(30));
                using var linkedCts = CancellationTokenSource.CreateLinkedTokenSource(
                                            cancellationToken, timeoutCts.Token);
 
                HttpResponseMessage httpResponse;
                try
                {
                    httpResponse = await _httpClient.PostAsync(
                                       "/v1/chat/completions",
                                       content,
                                       linkedCts.Token)
                                     .ConfigureAwait(false);
                }
                catch (Exception e) when (!cancellationToken.IsCancellationRequested)
                {
                    throw new Exception();
                }
 
                if (!httpResponse.IsSuccessStatusCode)
                {
                    var rawError = await httpResponse.Content.ReadAsStringAsync().ConfigureAwait(false);
                    throw new HttpRequestException(
                        $"Server returned {(int)httpResponse.StatusCode} – {httpResponse.ReasonPhrase}. Body: {rawError}");
                }
 
                var chatResponse = await httpResponse.Content
                                       .ReadFromJsonAsync<ChatResponse>(_jsonOptions, linkedCts.Token)
                                       .ConfigureAwait(false);
 
                var firstChoice = chatResponse?.Choices?.Count > 0 ? chatResponse.Choices[0] : null;
                if (firstChoice?.Message?.Content == null)
                    throw new InvalidOperationException("The response does not contain a usable message.");
 
                return firstChoice.Message.Content;
            }

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The documentation for this class was generated from the following file:

• BioGTK/BioGTK/Source/AI.cs