ollamasharpskchatcompletion.cs

ollamasharpskchatcompletion.cs

//    Copyright (c) 2024
//    Author      : Bruno Capuano
//    Change Log  :
//    - Sample Chat Completion Service for Ollama models
//
//    The MIT License (MIT)
//
//    Permission is hereby granted, free of charge, to any person obtaining a copy
//    of this software and associated documentation files (the "Software"), to deal
//    in the Software without restriction, including without limitation the rights
//    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//    copies of the Software, and to permit persons to whom the Software is
//    furnished to do so, subject to the following conditions:
//
//    The above copyright notice and this permission notice shall be included in
//    all copies or substantial portions of the Software.
//
//    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//    THE SOFTWARE.

using Microsoft.SemanticKernel;
using Microsoft.SemanticKernel.ChatCompletion;
using OllamaSharp;
using OllamaSharp.Models.Chat;

namespace sk_ollamacsharp
{
    public class OllamaChatCompletionService : IChatCompletionService
    {
        // public property for the model url endpoint
        public string ModelUrl { get; set; }
        public string ModelName { get; set; }

        public IReadOnlyDictionary<string, object?> Attributes => throw new NotImplementedException();

        public async Task<IReadOnlyList<ChatMessageContent>> GetChatMessageContentsAsync(ChatHistory chatHistory, PromptExecutionSettings? executionSettings = null, Kernel? kernel = null, CancellationToken cancellationToken = default)
        {
            var ollama = new OllamaApiClient(ModelUrl, ModelName); // (uri);

            var chat = new Chat(ollama, _ => { });


            // iterate though chatHistory Messages
            foreach (var message in chatHistory)
            {
                if (message.Role == AuthorRole.System)
                {
                    await chat.SendAs(ChatRole.System, message.Content);
                    continue;
                }
            }

            var lastMessage = chatHistory.LastOrDefault();

            string question = lastMessage.Content;
            var chatResponse = "";
            var history = (await chat.Send(question, CancellationToken.None)).ToArray();

            var last = history.Last();
            chatResponse = last.Content;

            chatHistory.AddAssistantMessage(chatResponse);

            return chatHistory;
        }

        public IAsyncEnumerable<StreamingChatMessageContent> GetStreamingChatMessageContentsAsync(ChatHistory chatHistory, PromptExecutionSettings? executionSettings = null, Kernel? kernel = null, CancellationToken cancellationToken = default)
        {
            throw new NotImplementedException();
        }

    }
}