chef_agent

2026-09-06 19:25:10 +08:00
parent 8efcd72eb2
commit 86ece1926d
10 changed files with 445 additions and 55 deletions
--- a/.env.example
+++ b/.env.example
@@ -18,6 +18,13 @@ DATABASE_POOL_SIZE=10
 DATABASE_MAX_OVERFLOW=20
 DATABASE_ECHO=False

+# 数据库Postgres配置
+POSTGRES_USER="postgres"
+POSTGRES_PASSWORD="123456"
+POSTGRES_HOST="127.0.0.1"
+POSTGRES_PORT=5432
+POSTGRES_DB="postgres"
+
 # CORS配置
 ALLOWED_ORIGINS=["*"]

--- a/api/agent_api.py
+++ b/api/agent_api.py
@@ -0,0 +1,52 @@
+from fastapi import APIRouter
+from fastapi.responses import StreamingResponse
+from pydantic import BaseModel, Field
+from services.agent_server.chef_service import ChefService
+
+# agent相关的路由
+agent_router = APIRouter(prefix="/agent", tags=["Agent相关"])
+
+
+class ChatRequest(BaseModel):
+    thread_id: str = Field(description="当前会话的id")
+    message: str = Field(description="当前会话的问题")
+
+
+class ChatResponse(BaseModel):
+    thread_id: str
+    content: str
+
+
+@agent_router.post("/chat", response_model=ChatResponse)
+def chat(request: ChatRequest):
+
+    result = ChefService.chat(
+        thread_id=request.thread_id,
+        message=request.message,
+    )
+
+    messages = result["messages"]
+
+    # 最后一条 AI 消息
+    last_message = messages[-1]
+
+    return ChatResponse(
+        thread_id=request.thread_id,
+        content=last_message.content,
+    )
+
+@agent_router.post("/chat_stream")
+def chat(request: ChatRequest):
+
+    def generate_stream():
+        result = ChefService.chat_stream(
+            thread_id=request.thread_id,
+            message=request.message,
+        )
+        for chunk in result:
+            yield chunk
+
+    return StreamingResponse(
+        generate_stream(),
+        media_type="text/plain; charset=utf-8"
+    )
--- a/core/config/settings.py
+++ b/core/config/settings.py
@@ -94,6 +94,30 @@ class Settings(BaseSettings):
        description="是否打印SQL语句"
    )

+    # ---------- 数据库Postgres配置 ----------
+    POSTGRES_USER: str = Field(
+        default='postgres',
+        description="postgres用户名"
+    )
+    POSTGRES_PASSWORD: str = Field(
+        default='123456',
+        description="postgres密码"
+    )
+    POSTGRES_HOST: str = Field(
+        default='127.0.0.1',
+        description="postgres主机地址"
+    )
+    POSTGRES_PORT: int = Field(
+        default=5432,
+        ge=1,
+        le=65535,
+        description="postgres端口"
+    )
+    POSTGRES_DB: str = Field(
+        default='postgres',
+        description="postgres数据库名"
+    )
+
    # ---------- CORS配置 ----------
    ALLOWED_ORIGINS: List[str] = Field(
        default=["*"],
@@ -161,6 +185,12 @@ class Settings(BaseSettings):
        # 连接url格式：mysql+pymysql://user:password@host:port/dbname
        return f"mysql+pymysql://{self.MYSQL_USER}:{self.MYSQL_PASSWORD}@{self.MYSQL_HOST}:{self.MYSQL_PORT}/{self.MYSQL_DB}?charset=utf8mb4"

+    @property
+    def postgres_url(self) -> str:
+        """postgres连接URL"""
+        # 连接url格式：postgresql://postgres:postgres@localhost:5432/postgres?sslmode=disable
+        return f"postgresql://{self.POSTGRES_USER}:{self.POSTGRES_PASSWORD}@{self.POSTGRES_HOST}:{self.POSTGRES_PORT}/{self.POSTGRES_DB}?sslmode=disable"
+
    @property
    def is_production(self) -> bool:
        """是否为生产环境"""
--- a/lc/chef_agent.py
+++ b/lc/chef_agent.py
@@ -1,71 +1,250 @@
-import os
-import sqlite3
-from typing import cast, Optional
+from __future__ import annotations

-from langchain.agents import create_agent, AgentState
+import logging
+from typing import Any, cast
+
+from langchain.agents import create_agent
 from langchain.agents.middleware import SummarizationMiddleware
 from langchain.agents.middleware.summarization import ContextMessages
 from langchain.chat_models import init_chat_model
 from langchain_core.language_models import BaseChatModel
-from langchain_core.messages import HumanMessage
-from langchain_core.runnables import RunnableConfig
-from langgraph.checkpoint.sqlite import SqliteSaver # 需要安装langgraph-checkpoint-sqlite
 from langchain_tavily import TavilySearch
+from langgraph.checkpoint.postgres import PostgresSaver
+from psycopg import Connection
+from psycopg_pool import ConnectionPool

 from core.config.settings import settings

-# 初始化模型 需要多模态大模型 deepseek已支持
-llm_model = init_chat_model(
-    model="deepseek-v4-flash",
-    model_provider="deepseek",
-    api_key=settings.DEEPSEEK_API_KEY
-)
+logger = logging.getLogger(__name__)

-# 定义工具 使用tavily搜索工具 langchain-tavily
-search_tool = TavilySearch(
-    tavily_api_key=settings.TAVILY_API_KEY,
-    max_results=5, # 最大搜索结果条数
-    topic="general"
-)
+class ChefAgent:
+    """厨师 Agent。

-# 定义记忆策略 使用SummarizationMiddleware摘要策略中间件
-summary = SummarizationMiddleware(
-    model=cast(BaseChatModel, llm_model),  # 消息摘要的记忆管理策略的模型
-    trigger=cast(ContextMessages, ("messages", 10)),  # 触发策略的条件
-    keep=cast(ContextMessages, ("messages", 5))  # 触发策略后保留的消息条数
-)
+    负责：
+    - LLM 初始化
+    - Tool 初始化
+    - CheckPointer 初始化
+    - Middleware 初始化
+    - Agent 初始化
+    - 生命周期管理
+    """

-# 创建数据库目录（如果不存在）
-os.makedirs("sqlite", exist_ok=True)
-# 创建 SQLite 数据库连接 check_same_thread=False 是为了确保在多线程环境下的安全性
-conn = sqlite3.connect("sqlite/checkpoints.db", check_same_thread=False)
-# 初始化 checkpointer
-checkpointer = SqliteSaver(conn)
-# 自动建表
-checkpointer.setup()
+    def __init__(self) -> None:
+        self._pool: ConnectionPool[Connection[Any]] | None = None
+        self._checkpointer: PostgresSaver | None = None
+        self._agent = None

-# agent提示词
-system_prompt = """
-你是一名有名的国宴厨师。收到用户提供的食材照片或清单后，按照以下流程步骤操作：
-1.识别和评估食材：若用户提供照片，首先辨别所有可见食材，基于食材的外观状态，评估其新鲜度和可用量，整理出一份“可用食材清单”。
-2.智能食谱检索：优先调用search_tool工具，以“可用食材清单”为核心关键词，查找可行菜谱。
-3.多维度评估与排序：从营养与烹饪难度这2个维度对检索到的候选食谱进行量化打分，并根据得分进行排序，制作简单且营养丰富的排名靠前。
-4.结构化方案输出：把排序后的食谱整理成一份结构清晰的建议报告，要包括食谱信息、得分、推荐理由、食谱的参考图片，帮助用户快速做出决策。
-"""
+    def initialize(self) -> ChefAgent:
+        """初始化 Agent。

-# 定义thread_config 用于记忆存储分组
-thread_config: RunnableConfig  = {"configurable": {"thread_id": "2"}}
+        Returns:
+            当前 Agent 实例，方便链式调用。
+        """

-# 创建agent
-agent = create_agent(
-    model=cast(BaseChatModel, llm_model), # 指定类型 避免idea报错
-    tools=[search_tool],
-    checkpointer=checkpointer,
-    middleware=[summary],
-    system_prompt=system_prompt
-)
+        logger.info("开始初始化chef_agent...")

-if __name__ == "__main__":
-    question = input("> ")
-    res = agent.invoke({"messages": [HumanMessage(content=question)]}, thread_config)
-    print(res)
+        if self._agent is not None:
+            return self
+
+        # 1. 初始化 LLM
+        llm = self._create_llm()
+
+        # 2. 初始化工具
+        tools = self._create_tools()
+
+        # 3. 初始化 Middleware
+        middleware = self._create_middleware(llm)
+
+        # 4. 初始化 CheckPointer
+        self._checkpointer = self._create_checkpointer()
+
+        # 5. 初始化 Agent
+        logger.info("chef_agent的agent开始初始化...")
+        self._agent = create_agent(
+            model=llm,
+            tools=tools,
+            middleware=middleware,
+            checkpointer=self._checkpointer,
+            system_prompt=self._system_prompt(),
+        )
+        logger.info("chef_agent的agent初始化完成")
+
+        logger.info("chef_agent初始化完成")
+
+        return self
+
+    @staticmethod
+    def _create_llm() -> BaseChatModel:
+        """创建 LLM。"""
+
+        logger.info("chef_agent初始化llm...")
+
+        llm = init_chat_model(
+            model="deepseek-v4-flash",
+            api_key=settings.DEEPSEEK_API_KEY,
+        )
+
+        logger.info("chef_agent的llm初始化完成")
+        return cast(BaseChatModel, llm)
+
+    @staticmethod
+    def _create_tools() -> list[Any]:
+        """创建 Agent Tools。"""
+
+        logger.info("chef_agent工具开始初始化...")
+        search_tool = TavilySearch(
+            tavily_api_key=settings.TAVILY_API_KEY,
+            max_results=5,
+            topic="general",
+        )
+
+        logger.info("chef_agent工具初始化完成")
+        return [search_tool]
+
+    @staticmethod
+    def _create_middleware(
+        llm: BaseChatModel,
+    ) -> list[Any]:
+        """创建 Agent Middleware。"""
+
+        logger.info("chef_agent中间件开始初始化...")
+        summarization = SummarizationMiddleware(
+            model=llm,
+            trigger=cast(ContextMessages, ("messages", 10)),
+            keep=cast(ContextMessages, ("messages", 5)),
+        )
+
+        logger.info("chef_agent中间件初始化完成")
+        return [summarization]
+
+    def _create_checkpointer(self) -> PostgresSaver:
+        """创建 PostgreSQL CheckPointer。"""
+
+        logger.info("chef_agent的CheckPointer开始初始化")
+        logger.info("创建PostgreSQL连接池")
+        self.pool: ConnectionPool[Connection[Any]] = ConnectionPool(
+            conninfo=settings.postgres_url,
+            max_size=10,
+            kwargs={
+                "autocommit": True,
+            },
+        )
+
+        logger.info("创建checkpointer")
+        checkpointer = PostgresSaver(self.pool)
+
+        logger.info("初始化checkpoint数据表")
+        # 创建 LangGraph checkpoint 所需的数据表
+        checkpointer.setup()
+
+        logger.info("chef_agent的CheckPointer初始化完成")
+        return checkpointer
+
+    @staticmethod
+    def _system_prompt() -> str:
+        """Agent System Prompt。"""
+
+        return """
+        你是一名专业厨师。
+        
+        你的任务是根据用户提供的食材照片或食材清单，为用户推荐合适的菜谱。
+        
+        请严格按照以下流程执行：
+        
+        ## 1. 识别和评估食材
+        
+        如果用户提供的是食材照片：
+        
+        - 识别照片中可见的食材
+        - 根据外观判断食材的新鲜程度
+        - 估算大致可用量
+        - 排除明显不可食用或状态异常的食材
+        
+        整理成「可用食材清单」。
+        
+        如果用户直接提供食材清单，则直接使用用户提供的信息。
+        
+        ## 2. 搜索菜谱
+        
+        优先使用搜索工具。
+        
+        以「可用食材清单」作为核心关键词，搜索适合这些食材的菜谱。
+        
+        优先考虑：
+        
+        - 食材匹配度高
+        - 操作简单
+        - 营养均衡
+        - 家庭烹饪可执行
+        
+        除非搜索不到合适结果，否则不要直接凭经验编造菜谱。
+        
+        ## 3. 评估和排序
+        
+        对搜索到的候选菜谱进行综合评价。
+        
+        从以下维度进行评分：
+        
+        - 食材匹配度
+        - 营养价值
+        - 烹饪难度
+        - 烹饪时间
+        
+        综合评分后进行排序。
+        
+        优先推荐：
+        
+        「简单 + 食材匹配度高 + 营养丰富」
+        
+        的菜谱。
+        
+        ## 4. 输出结果
+        
+        最终输出结构化的菜谱推荐报告。
+        
+        每个推荐至少包含：
+        
+        - 菜谱名称
+        - 所需食材
+        - 核心烹饪步骤
+        - 烹饪时间
+        - 难度
+        - 综合评分
+        - 推荐理由
+        - 参考来源
+        
+        如果搜索结果中存在可靠的菜谱图片，则提供图片参考。
+        
+        如果搜索不到合适菜谱，再根据已有知识进行合理推荐，并明确说明这是基于模型知识给出的建议。
+        """.strip()
+
+    @property
+    def agent(self):
+        """获取 Agent。"""
+
+        if self._agent is None:
+            raise RuntimeError(
+                "ChefAgent 尚未初始化，请先调用 initialize()"
+            )
+
+        return self._agent
+
+    def close(self) -> None:
+        """释放资源。"""
+
+        if self._pool is not None:
+            self._pool.close()
+            self._pool = None
+
+        self._checkpointer = None
+        self._agent = None
+
+    # 使用with上下文管理方式来使用的话需要这2个方法
+    # def __enter__(self) -> ChefAgent:
+    #     return self.initialize()
+    #
+    # def __exit__(self, exc_type, exc_value, traceback) -> None:
+    #     self.close()
+
+
+chef_agent = ChefAgent()
--- a/main.py
+++ b/main.py
@@ -5,11 +5,14 @@ from contextlib import asynccontextmanager
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 from sqlmodel import SQLModel
+
+from api.agent_api import agent_router
 from core.db import engine
 from core.config.settings import settings
 from api.scheduler_api import scheduler_router
 from api.lottery_api import lottery_router
 from core.task.dlt_scheduler import scheduler
+from lc.chef_agent import chef_agent

 # 配置日志
 logging.basicConfig(
@@ -30,14 +33,19 @@ async def lifespan(app: FastAPI):
    # 启动定时调度器
    scheduler.start()

+    # 初始化chef_agent
+    chef_agent.initialize()
+
    yield   # 此处交出控制权，服务开始运行
    # ========== 关闭时执行 ==========
    logger.info("服务关闭，释放资源")
+    chef_agent.close()
    scheduler.shutdown()

 app = FastAPI(lifespan=lifespan)
 app.include_router(scheduler_router)
 app.include_router(lottery_router)
+app.include_router(agent_router)

 app.add_middleware(
    CORSMiddleware, # type: ignore[arg-type]
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,9 +11,13 @@ dependencies = [
    "langchain-deepseek==1.1.0",
    "langchain-tavily==0.2.18",
    "langgraph>=1.2.11",
+    "langgraph-checkpoint-postgres>=3.1.2",
    "langgraph-checkpoint-sqlite==3.1.1",
    "notebook>=7.6.2",
    "openai==3.8.0",
+    "psycopg>=3.3.5",
+    "psycopg-binary>=3.3.5",
+    "psycopg-pool>=3.3.1",
    "pydantic==2.13.5",
    "pydantic-settings==2.15.0",
    "pymysql==1.2.0",
--- a/services/agent_server/init.py
+++ b/services/agent_server/init.py
--- a/services/agent_server/chef_service.py
+++ b/services/agent_server/chef_service.py
@@ -0,0 +1,23 @@
+from langchain_core.messages import HumanMessage
+from langchain_core.runnables import RunnableConfig
+
+from lc.chef_agent import chef_agent
+
+
+class ChefService:
+
+    @staticmethod
+    def chat(
+        thread_id: str,
+        message: str,
+    ):
+        config: RunnableConfig = {"configurable": {"thread_id": thread_id}}
+        result = chef_agent.agent.invoke({"messages": [HumanMessage(content=message)]}, config)
+
+        return result
+
+    @staticmethod
+    def chat_stream(thread_id: str, message: str):
+        config: RunnableConfig = {"configurable": {"thread_id": thread_id}}
+        result = chef_agent.agent.stream({"messages": [("user", message)]}, config=config, stream_mode="messages")
+        return result
--- a/test.py
+++ b/test.py
@@ -0,0 +1,11 @@
+sys_prompt = """
+你是一名有名的厨师。收到用户提供的食材照片或清单后，按照以下流程步骤操作：
+1.识别和评估食材：若用户提供照片，首先辨别所有可见食材，基于食材的外观状态，评估其新鲜度和可用量，整理出一份“可用食材清单”。
+2.智能食谱检索：优先调用搜索工具，以“可用食材清单”为核心关键词，查找可行菜谱。
+3.多维度评估与排序：从营养与烹饪难度这2个维度对检索到的候选食谱进行量化打分，并根据得分进行排序，制作简单且营养丰富的排名靠前。
+4.结构化方案输出：把排序后的食谱整理成一份结构清晰的建议报告，要包括食谱信息、得分、推荐理由、食谱的参考图片，帮助用户快速做出决策。
+严格按照流程进行操作，搜索不到再自己发挥。
+"""
+
+if __name__ == "__main__":
+    print(sys_prompt)
--- a/uv.lock
+++ b/uv.lock
@@ -1309,6 +1309,21 @@ wheels = [
    { url = "https://files.pythonhosted.org/packages/05/71/3b475f09bd57d3a5649792c66353312b4432afd843f301739dfcebd157f0/langgraph_checkpoint-4.2.0-py3-none-any.whl", hash = "sha256:0547fd228935a0b758865de3a3d6d7a2537c308895d0f9ab092ce9151b5da942", size = 56833, upload-time = "2026-08-07T20:05:02.655Z" },
 ]

+[[package]]
+name = "langgraph-checkpoint-postgres"
+version = "3.1.2"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "langgraph-checkpoint" },
+    { name = "orjson" },
+    { name = "psycopg" },
+    { name = "psycopg-pool" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/9d/52/6e732f7bf702ef4918b64ea4107e7da21d4276b808f9a651fe34be9b0abe/langgraph_checkpoint_postgres-3.1.2.tar.gz", hash = "sha256:1cd404803ff895a2b79f3ac04ce92b775e6b999715f8333fce674c6d927bba95", size = 155091, upload-time = "2026-08-07T20:40:00.049Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/0f/62/8899c9f4d9b97d5b3eb0c07c13cdf5f63342f15f5ef93eaf3477958df602/langgraph_checkpoint_postgres-3.1.2-py3-none-any.whl", hash = "sha256:6a7e38ef16985b54e356cba7bdaf447943aae33d5aaf290026c593bb6b4a6264", size = 52084, upload-time = "2026-08-07T20:39:58.994Z" },
+]
+
 [[package]]
 name = "langgraph-checkpoint-sqlite"
 version = "3.1.1"
@@ -1399,9 +1414,13 @@ dependencies = [
    { name = "langchain-deepseek" },
    { name = "langchain-tavily" },
    { name = "langgraph" },
+    { name = "langgraph-checkpoint-postgres" },
    { name = "langgraph-checkpoint-sqlite" },
    { name = "notebook" },
    { name = "openai" },
+    { name = "psycopg" },
+    { name = "psycopg-binary" },
+    { name = "psycopg-pool" },
    { name = "pydantic" },
    { name = "pydantic-settings" },
    { name = "pymysql" },
@@ -1422,9 +1441,13 @@ requires-dist = [
    { name = "langchain-deepseek", specifier = "==1.1.0" },
    { name = "langchain-tavily", specifier = "==0.2.18" },
    { name = "langgraph", specifier = ">=1.2.11" },
+    { name = "langgraph-checkpoint-postgres", specifier = ">=3.1.2" },
    { name = "langgraph-checkpoint-sqlite", specifier = "==3.1.1" },
    { name = "notebook", specifier = ">=7.6.2" },
    { name = "openai", specifier = "==3.8.0" },
+    { name = "psycopg", specifier = ">=3.3.5" },
+    { name = "psycopg-binary", specifier = ">=3.3.5" },
+    { name = "psycopg-pool", specifier = ">=3.3.1" },
    { name = "pydantic", specifier = "==2.13.5" },
    { name = "pydantic-settings", specifier = "==2.15.0" },
    { name = "pymysql", specifier = "==1.2.0" },
@@ -1944,6 +1967,59 @@ wheels = [
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