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# Backend App - 后端应用目录
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2026-04-29 13:04:10 +08:00
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本目录包含 AI Agent 系统的所有后端代码,采用模块化设计,层级清晰。
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---
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## 📁 目录结构
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```
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app/
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├── __init__.py # 应用初始化
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├── backend.py # FastAPI 主入口,包含 API 端点
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├── config.py # 配置管理
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├── logger.py # 日志工具
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│
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├── core/ # ⭐ 核心模块 - 基类和通用工具
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│ ├── __init__.py
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│ ├── state_base.py # 子图状态基类
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│ ├── intent.py # 意图理解(React 模式)
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│ ├── intent_classifier.py # 意图分类器
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│ ├── formatter.py # 格式化输出工具
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│ └── human_review.py # 人工审核节点
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│
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├── agent/ # ⭐ Agent 服务层
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│ ├── __init__.py
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│ ├── agent_service.py # AIAgentService - 核心服务类
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│ ├── history.py # 历史查询服务
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│ └── prompts.py # 提示词模板
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│
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├── main_graph/ # ⭐ 主图 - LangGraph 主流程
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│ ├── __init__.py
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│ ├── state.py # 主图状态定义(MainGraphState)
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│ ├── graph.py # 图组件重导出
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│ ├── config.py # 流配置
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│ │
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│ ├── nodes/ # 主图节点
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│ │ ├── __init__.py
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│ │ ├── react_nodes.py # React 模式节点(推理、路由)
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│ │ ├── llm_call.py # LLM 调用节点
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│ │ ├── retrieve_memory.py # 记忆检索节点
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│ │ ├── memory_trigger.py # 记忆触发节点
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│ │ ├── summarize.py # 记忆摘要节点
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│ │ ├── finalize.py # 最终处理节点
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│ │ ├── rag_nodes.py # RAG 相关节点
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│ │ ├── web_search_node.py # 联网搜索节点
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│ │ └── error_handling_node.py # 错误处理节点
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│ │
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│ ├── tools/ # 主图工具
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│ │ ├── __init__.py
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│ │ ├── graph_tools.py # 图工具定义
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│ │ └── subgraph_tools.py # 子图调用工具
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│ │
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│ └── utils/ # 主图工具函数
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│ ├── __init__.py
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│ ├── main_graph_builder.py # 主图构建器
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│ ├── retry_utils.py # 重试工具
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│ ├── rag_initializer.py # RAG 初始化工具
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│ └── visualize_graph.py # 图可视化工具
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│
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├── subgraphs/ # ⭐ 子图模块
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│ ├── __init__.py
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│ │
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│ ├── contact/ # 通讯录子图
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│ │ ├── __init__.py
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│ │ ├── state.py # 状态定义
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│ │ ├── nodes.py # 节点实现
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│ │ ├── graph.py # 图构建
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│ │ └── api_client.py # API 客户端
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│ │
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│ ├── dictionary/ # 词典子图
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│ │ ├── __init__.py
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│ │ ├── state.py # 状态定义
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│ │ ├── nodes.py # 节点实现
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│ │ ├── graph.py # 图构建
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│ │ └── api_client.py # API 客户端
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│ │
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│ └── news_analysis/ # 资讯分析子图
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│ ├── __init__.py
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│ ├── state.py # 状态定义
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│ ├── nodes.py # 节点实现
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│ ├── graph.py # 图构建
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│ └── api_client.py # API 客户端
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│
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├── model_services/ # 模型服务层
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│ ├── __init__.py
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│ ├── README.md # 模型服务文档
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│ ├── base.py # 基类:BaseServiceProvider, FallbackServiceChain
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│ ├── chat_services.py # 生成式大模型服务
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│ ├── embedding_services.py # 嵌入模型服务
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│ └── rerank_services.py # 重排序服务
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│
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├── rag/ # RAG 模块
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│ ├── __init__.py
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│ ├── retriever.py # 检索器
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│ ├── rerank.py # 重排序业务逻辑
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│ ├── query_transform.py # 查询转换
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│ ├── pipeline.py # RAG 流水线
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│ ├── fusion.py # RAG-Fusion
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│ ├── tools.py # RAG 工具
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│ └── evaluate.py # RAG 评估
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│
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├── memory/ # 记忆模块
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│ ├── __init__.py
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│ └── mem0_client.py # Mem0 客户端封装
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│
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├── db/ # 数据库模块
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│ ├── __init__.py
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│ ├── base.py # 数据库基类
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│ ├── models.py # 数据模型
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│ └── init_db.py # 数据库初始化
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│
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└── utils/ # 工具模块
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├── __init__.py
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└── logging.py # 日志工具
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```
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---
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## 📖 模块详解
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### 1. `core/` - 核心模块
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这是整个系统的基础,被主图和所有子图共享:
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| 文件 | 说明 |
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| `state_base.py` | 所有子图状态的基类,定义通用字段和方法 |
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| `intent.py` | React 模式的意图理解,用于解析用户意图 |
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| `intent_classifier.py` | 意图分类器,用于混合路由 |
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| `formatter.py` | 输出格式化工具,用于统一美化子图输出 |
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| `human_review.py` | 人工审核节点,需要人工确认的操作 |
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---
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### 2. `agent/` - Agent 服务层
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对外提供服务的核心层:
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| 文件 | 说明 |
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|------|------|
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| `agent_service.py` | `AIAgentService` 类,管理模型、图、工具,提供 `process_message` 和 `process_message_stream` 方法 |
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| `history.py` | 历史对话查询服务 |
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| `prompts.py` | 系统提示词模板 |
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---
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### 3. `main_graph/` - 主图(React 模式)
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LangGraph 的主流程,采用 React 模式(Reasoning + Acting):
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| 目录/文件 | 说明 |
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|----------|------|
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| `state.py` | 主图状态定义(MainGraphState),整合所有旧状态字段 |
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| `graph.py` | StateGraph, START, END 等组件重导出 |
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| `config.py` | 流写入器配置 |
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| `nodes/` | 所有节点实现 |
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| `tools/` | 图的工具定义 |
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| `utils/main_graph_builder.py` | 主图构建器 - 构建完整的 React 模式图 |
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#### 🔄 主图节点说明
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| 节点 | 类型 | 说明 |
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| `retrieve_memory` | 记忆 | 从 Mem0 检索相关长期记忆 |
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| `memory_trigger` | 记忆 | 检测记忆指令,主动触发存储 |
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| `init_state` | React | 初始化状态 |
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| `react_reason` | React | 推理节点,理解意图并决策下一步 |
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| `rag_retrieve` | 工具 | RAG 检索 |
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| `web_search` | 工具 | 联网搜索 |
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| `contact_subgraph` | 子图 | 调用通讯录子图 |
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| `dictionary_subgraph` | 子图 | 调用词典子图 |
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| `news_analysis_subgraph` | 子图 | 调用资讯分析子图 |
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| `handle_error` | 错误 | 错误处理和重试 |
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| `llm_call` | 模型 | 调用大模型生成回复 |
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| `summarize` | 记忆 | 对话总结,提交 Mem0 存储 |
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| `finalize` | 完成 | 发送完成事件 |
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---
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### 4. `subgraphs/` - 子图模块
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三个独立的子图,每个子图都有完整的 `state.py`、`nodes.py`、`graph.py`:
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| 子图 | 功能 |
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|------|------|
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| `contact/` | 通讯录管理:CRUD、邮件处理、智能嗅探 |
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| `dictionary/` | 词典:查词、翻译、生词本、专业术语提取 |
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| `news_analysis/` | 资讯分析:获取资讯、内容分析、格式化展示 |
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---
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### 5. `model_services/` - 模型服务层
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统一的模型服务接口,支持自动降级:
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| 文件 | 说明 |
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|------|------|
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| `base.py` | `BaseServiceProvider`(基类)、`FallbackServiceChain`(降级链) |
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| `chat_services.py` | 生成式大模型服务(智谱、DeepSeek、本地) |
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| `embedding_services.py` | 嵌入模型服务 |
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| `rerank_services.py` | 重排序服务 |
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---
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### 6. `rag/` - RAG 模块
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知识库检索相关:
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| 文件 | 说明 |
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|------|------|
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| `retriever.py` | 向量检索器 |
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| `rerank.py` | 重排序业务逻辑 |
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| `pipeline.py` | RAG 流水线 |
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| `fusion.py` | RAG-Fusion 多路召回融合 |
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| `tools.py` | 封装为 LangChain Tool 的 RAG 工具 |
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| `evaluate.py` | RAG 评估工具 |
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2026-04-26 12:09:37 +08:00
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---
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2026-05-01 23:45:08 +08:00
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## 🔄 完整流程图
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```
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START
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↓
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retrieve_memory (从Mem0检索长期记忆)
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↓
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memory_trigger (记忆触发器 - 检测记忆指令)
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↓
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init_state (初始化状态)
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↓
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react_reason (推理节点 - 理解意图并决策) ←───────────┐
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↓ │
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route_by_reasoning (条件路由) │
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↓ │
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┌─────────────────────────────────────────────────┐ │
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│ 分支选择: │ │
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│ ├─ rag_retrieve →───────────────────────────┐ │ │
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│ ├─ web_search →─────────────────────────────┤ │ │
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│ ├─ contact_subgraph →───────────────────────┤ │ │
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│ ├─ dictionary_subgraph →────────────────────┤ │ │
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│ ├─ news_analysis_subgraph →─────────────────┤ │ │
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│ ├─ handle_error →───────────────────────────┤ │ │
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│ └─ llm_call →────────────────────────────────┘ │ │
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└─────────────────────────────────────────────────┘ │
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↓ │
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(回到 react_reason) ──────────────────┘
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↓
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(无工具调用)
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↓
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llm_call (直接生成回复)
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↓
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┌─────────────────────────────────────────────────┐
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│ 检查:需要总结吗?(turns_since_last_summary >=5?) │
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│ ├─ 是 → summarize (提交Mem0存储) │
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│ └─ 否 → (跳过) │
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└─────────────────────────────────────────────────┘
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↓
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finalize (发送完成事件)
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↓
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END
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```
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---
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## 📊 数据流
|
2026-04-26 12:09:37 +08:00
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```
|
2026-04-29 13:04:10 +08:00
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用户请求
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└─> backend.py (FastAPI)
|
2026-05-01 23:45:08 +08:00
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└─> agent/agent_service.py (AIAgentService)
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├─> model_services/ (获取模型 - 支持降级链)
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├─> main_graph/utils/main_graph_builder.py (构建主图)
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└─> graph.astream() (执行图流)
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├─> nodes/ (执行节点)
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├─> tools/ (调用工具)
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├─> rag/ (RAG 检索)
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├─> subgraphs/ (可选:调用子图)
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└─> memory/ (记忆检索和存储)
|
2026-04-26 12:09:37 +08:00
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```
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|
2026-04-29 13:04:10 +08:00
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---
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## 🚀 启动方式
|
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FastAPI 应用入口是 `backend.py`,可以通过以下方式启动:
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```bash
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# 方式 1:直接运行
|
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cd backend && python -m app.backend
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|
# 方式 2:Uvicorn
|
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|
uvicorn app.backend:app --reload --host 0.0.0.0 --port 8079
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|
# 方式 3:Docker
|
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|
docker compose up
|
2026-04-26 12:09:37 +08:00
|
|
|
|
```
|
2026-05-01 23:45:08 +08:00
|
|
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|
---
|
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|
## 📝 状态系统
|
|
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|
|
### MainGraphState
|
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|
|
所有节点统一使用 `MainGraphState`(dataclass),包含以下字段:
|
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|
|
|
|
|
|
```python
|
|
|
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|
|
@dataclass
|
|
|
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|
|
class MainGraphState:
|
|
|
|
|
|
# 消息和记忆
|
|
|
|
|
|
messages: Annotated[Sequence[BaseMessage], add_messages]
|
|
|
|
|
|
llm_calls: int
|
|
|
|
|
|
memory_context: str
|
|
|
|
|
|
system_prompt: str
|
|
|
|
|
|
turns_since_last_summary: int
|
|
|
|
|
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|
|
|
|
|
# LLM 输出
|
|
|
|
|
|
last_token_usage: Dict[str, Any]
|
|
|
|
|
|
last_elapsed_time: float
|
|
|
|
|
|
|
|
|
|
|
|
# 用户信息
|
|
|
|
|
|
user_query: str
|
|
|
|
|
|
user_id: str
|
|
|
|
|
|
|
|
|
|
|
|
# React 推理
|
|
|
|
|
|
reasoning_step: int
|
|
|
|
|
|
max_steps: int
|
|
|
|
|
|
last_action: str
|
|
|
|
|
|
reasoning_history: List[Dict[str, Any]]
|
|
|
|
|
|
|
|
|
|
|
|
# RAG 相关
|
|
|
|
|
|
rag_context: str
|
|
|
|
|
|
rag_retrieved: bool
|
|
|
|
|
|
rag_docs: List[Dict[str, Any]]
|
|
|
|
|
|
|
|
|
|
|
|
# 搜索相关
|
|
|
|
|
|
web_search_results: List[str]
|
|
|
|
|
|
|
|
|
|
|
|
# 错误处理
|
|
|
|
|
|
errors: List[ErrorRecord]
|
|
|
|
|
|
current_error: Optional[ErrorRecord]
|
|
|
|
|
|
retry_action: Optional[str]
|
|
|
|
|
|
|
|
|
|
|
|
# 子图结果
|
|
|
|
|
|
news_result: Optional[Dict[str, Any]]
|
|
|
|
|
|
dictionary_result: Optional[Dict[str, Any]]
|
|
|
|
|
|
contact_result: Optional[Dict[str, Any]]
|
|
|
|
|
|
|
|
|
|
|
|
# 执行状态
|
|
|
|
|
|
current_action: CurrentAction
|
|
|
|
|
|
current_phase: str
|
|
|
|
|
|
error_message: str
|
|
|
|
|
|
final_result: str
|
|
|
|
|
|
success: bool
|
|
|
|
|
|
|
|
|
|
|
|
# 元数据
|
|
|
|
|
|
start_time: Optional[str]
|
|
|
|
|
|
end_time: Optional[str]
|
|
|
|
|
|
debug_info: Dict[str, Any]
|
|
|
|
|
|
```
|