291 lines
10 KiB
C#
291 lines
10 KiB
C#
using System.Collections.Concurrent;
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using System.Text;
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using Microsoft.AspNetCore.Authorization;
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using Microsoft.AspNetCore.Http;
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using Microsoft.AspNetCore.Mvc;
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using Microsoft.Extensions.DependencyInjection;
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using Microsoft.Extensions.Logging;
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using Newtonsoft.Json;
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using Newtonsoft.Json.Serialization;
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using OpenAI.Chat;
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using Volo.Abp.Application.Services;
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using Volo.Abp.Users;
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using Yi.Framework.AiHub.Application.Contracts.Dtos;
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using Yi.Framework.AiHub.Application.Contracts.Dtos.OpenAiDto;
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using Yi.Framework.AiHub.Domain.Entities.OpenApi;
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using Yi.Framework.AiHub.Domain.Managers;
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using Yi.Framework.AiHub.Domain.Shared.Dtos;
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using Yi.Framework.SqlSugarCore.Abstractions;
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namespace Yi.Framework.AiHub.Application.Services;
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public class OpenApiService : ApplicationService
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{
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private readonly IHttpContextAccessor _httpContextAccessor;
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private readonly ILogger<OpenApiService> _logger;
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private readonly TokenManager _tokenManager;
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private readonly AiMessageManager _aiMessageManager;
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private readonly UsageStatisticsManager _usageStatisticsManager;
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public OpenApiService(IHttpContextAccessor httpContextAccessor, ILogger<OpenApiService> logger,
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TokenManager tokenManager, AiMessageManager aiMessageManager, UsageStatisticsManager usageStatisticsManager)
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{
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_httpContextAccessor = httpContextAccessor;
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_logger = logger;
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_tokenManager = tokenManager;
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_aiMessageManager = aiMessageManager;
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_usageStatisticsManager = usageStatisticsManager;
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}
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/// <summary>
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/// 对话
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/// </summary>
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/// <param name="input"></param>
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/// <param name="cancellationToken"></param>
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[HttpPost("openApi/v1/chat/completions")]
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public async Task ChatCompletionsAsync(ChatCompletionsInput input, CancellationToken cancellationToken)
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{
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//前面都是校验，后面才是真正的调用
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var httpContext = this._httpContextAccessor.HttpContext;
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var userId = await _tokenManager.GetUserIdAsync(GetTokenByHttpContext(httpContext));
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var response = httpContext.Response;
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// 设置响应头，声明是 SSE 流
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response.ContentType = "text/event-stream";
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response.Headers.Append("Cache-Control", "no-cache");
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response.Headers.Append("Connection", "keep-alive");
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var history = new List<ChatMessage>();
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foreach (var aiChatContextDto in input.Messages)
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{
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if (aiChatContextDto.Role == "assistant")
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{
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history.Add(ChatMessage.CreateAssistantMessage(aiChatContextDto.Content));
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}
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else if (aiChatContextDto.Role == "user")
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{
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history.Add(ChatMessage.CreateUserMessage(aiChatContextDto.Content));
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}
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}
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var gateWay = LazyServiceProvider.GetRequiredService<AiGateWayManager>();
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var completeChatResponse = gateWay.CompleteChatAsync(input.Model, history, cancellationToken);
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var tokenUsage = new TokenUsage();
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await using var writer = new StreamWriter(response.Body, Encoding.UTF8, leaveOpen: true);
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//缓存队列算法
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// 创建一个队列来缓存消息
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var messageQueue = new ConcurrentQueue<string>();
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StringBuilder backupSystemContent = new StringBuilder();
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// 设置输出速率（例如每50毫秒输出一次）
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var outputInterval = TimeSpan.FromMilliseconds(100);
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// 标记是否完成接收
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var isComplete = false;
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// 启动一个后台任务来消费队列
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var outputTask = Task.Run(async () =>
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{
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while (!(isComplete && messageQueue.IsEmpty))
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{
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if (messageQueue.TryDequeue(out var message))
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{
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await writer.WriteLineAsync(message);
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await writer.FlushAsync(cancellationToken);
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}
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if (!isComplete)
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{
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// 如果没有完成，才等待，已完成，全部输出
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await Task.Delay(outputInterval, cancellationToken);
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}
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}
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}, cancellationToken);
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//IAsyncEnumerable 只能在最外层捕获异常（如果你有其他办法的话...）
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try
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{
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await foreach (var data in completeChatResponse)
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{
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if (data.IsFinish)
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{
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tokenUsage = data.TokenUsage;
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}
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var model = MapToMessage(input.Model, data.Content);
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var message = JsonConvert.SerializeObject(model, new JsonSerializerSettings
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{
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ContractResolver = new CamelCasePropertyNamesContractResolver()
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});
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backupSystemContent.Append(data.Content);
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// 将消息加入队列而不是直接写入
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messageQueue.Enqueue($"data: {message}\n");
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}
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}
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catch (Exception e)
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{
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_logger.LogError(e, $"Ai对话异常");
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var errorContent = $"Ai对话异常，异常信息：\n{e.Message}";
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var model = MapToMessage(input.Model, errorContent);
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var message = JsonConvert.SerializeObject(model, new JsonSerializerSettings
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{
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ContractResolver = new CamelCasePropertyNamesContractResolver()
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});
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backupSystemContent.Append(errorContent);
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messageQueue.Enqueue($"data: {message}\n");
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}
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//断开连接
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messageQueue.Enqueue("data: [DONE]\n");
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// 标记完成并发送结束标记
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isComplete = true;
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await outputTask;
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await _aiMessageManager.CreateUserMessageAsync(userId, null,
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new MessageInputDto
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{
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Content = input.Messages.LastOrDefault()
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.Content,
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ModelId = input.Model,
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TokenUsage = tokenUsage,
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});
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await _aiMessageManager.CreateSystemMessageAsync(userId, null,
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new MessageInputDto
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{
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Content = backupSystemContent.ToString(),
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ModelId = input.Model,
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TokenUsage = tokenUsage
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});
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await _usageStatisticsManager.SetUsageAsync(userId, input.Model, tokenUsage.InputTokenCount,
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tokenUsage.OutputTokenCount);
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}
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/// <summary>
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/// 获取模型列表
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/// </summary>
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/// <returns></returns>
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[HttpGet("openApi/v1/models")]
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public async Task<ModelGetOutput> ModelsAsync()
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{
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return new ModelGetOutput()
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{
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Data = new List<ModelDataOutput>()
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{
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new ModelDataOutput
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{
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ModelId = "gpt-4.1-mini",
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Object = "model",
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Owned_by = "organization-owner",
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Permission = new List<string>()
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},
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new ModelDataOutput
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{
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ModelId = "gpt-4.1-nano",
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Object = "model",
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Owned_by = "organization-owner",
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Permission = new List<string>()
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}
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}
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};
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}
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private SendMessageOutputDto MapToMessage(string modelId, string content)
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{
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var output = new SendMessageOutputDto
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{
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Id = "chatcmpl-BotYP3BlN5T4g9YPnW0fBSBvKzXdd",
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Object = "chat.completion.chunk",
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Created = 1750336171,
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Model = modelId,
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Choices = new()
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{
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new Choice
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{
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Index = 0,
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Delta = new Delta
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{
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Content = content,
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Role = "assistant"
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},
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FinishReason = null,
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ContentFilterResults = new()
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{
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Hate = new()
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{
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Filtered = false,
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Detected = null
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},
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SelfHarm = new()
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{
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Filtered = false,
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Detected = null
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},
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Sexual = new()
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{
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Filtered = false,
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Detected = null
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},
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Violence = new()
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{
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Filtered = false,
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Detected = null
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},
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Jailbreak = new()
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{
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Filtered = false,
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Detected = false
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},
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Profanity = new()
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{
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Filtered = false,
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Detected = false
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},
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}
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}
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},
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SystemFingerprint = "",
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Usage = new Usage
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{
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PromptTokens = 0,
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CompletionTokens = 0,
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TotalTokens = 0,
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PromptTokensDetails = new()
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{
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AudioTokens = 0,
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CachedTokens = 0
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},
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CompletionTokensDetails = new()
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{
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AudioTokens = 0,
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ReasoningTokens = 0,
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AcceptedPredictionTokens = 0,
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RejectedPredictionTokens = 0
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}
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}
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};
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return output;
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}
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private string? GetTokenByHttpContext(HttpContext httpContext)
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{
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// 获取Authorization头
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string authHeader = httpContext.Request.Headers["Authorization"];
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// 检查是否有Bearer token
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if (authHeader != null && authHeader.StartsWith("Bearer "))
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{
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return authHeader.Substring("Bearer ".Length).Trim();
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}
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return null;
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}
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} |