rag-gateway/app/models/v2/session_model.py

import json
import pytz

from datetime import datetime
from sqlalchemy.orm import Session
from typing import Optional, Type
from pydantic import BaseModel
from sqlalchemy import Column, String, Integer, DateTime, JSON, TEXT, Index

from Log import logger
from app.models.agent_model import AgentType
from app.models.base_model import Base

def current_time():
    tz = pytz.timezone('Asia/Shanghai')
    return datetime.now(tz)

class ChatSessionModel(Base):
    __tablename__ = "chat_sessions"

    # __table_args__ = (
    #     Index('idx_username', 'username'),
    # )

    id = Column(Integer, primary_key=True)
    name = Column(String(255))
    agent_id = Column(String(255))
    agent_type = Column(Integer)  # 目前只存basic的，ragflow和bisheng的调接口获取
    create_date = Column(DateTime, default=current_time)  # 创建时间，默认值为当前时区时间
    update_date = Column(DateTime, default=current_time, onupdate=current_time, index=True)  # 更新时间，默认值为当前时区时间，更新时自动更新
    tenant_id = Column(Integer)  # 创建人
    message = Column(TEXT)  # 说明
    reference = Column(TEXT)  # 说明
    conversation_id = Column(String(64))
    session_id = Column(String(36), index=True)
    chat_mode = Column(Integer)

    # to_dict 方法
    def to_dict(self):
        return {
            'id': self.id,
            'name': self.name,
            'agent_type': self.agent_type,
            'agent_id': self.agent_id,
            'create_date': self.create_date.strftime("%Y-%m-%d %H:%M:%S"),
            'update_date': self.update_date.strftime("%Y-%m-%d %H:%M:%S"),
        }

    def log_to_json(self):
        return {
            'id': self.id,
            'name': self.name,
            'agent_type': self.agent_type,
            'agent_id': self.agent_id,
            'create_date': self.create_date.strftime("%Y-%m-%d %H:%M:%S"),
            'update_date': self.update_date.strftime("%Y-%m-%d %H:%M:%S"),
            'message': json.loads(self.message)
        }

    def add_message(self, message: dict):
        if self.message is None:
            self.message = '[]'
        try:
            msg = json.loads(self.message)
            msg.append(message)
        except Exception as e:
            return
        self.message = json.dumps(msg)


class ChatDialogData(BaseModel):
    sessionId: Optional[str] = ""
    question: str
    chatId: str



class ChatSessionDao:
    def __init__(self, db: Session):
        self.db = db

    def create_session(self, session_id: str, name: str, agent_id: str, agent_type: int, user_id: int, message: str,reference:str) -> ChatSessionModel:
        new_session = ChatSessionModel(
            id=session_id,
            name=name[0:255],
            agent_id=agent_id,
            agent_type=agent_type,
            create_date=current_time(),
            update_date=current_time(),
            tenant_id=user_id,
            message=message,
            reference=reference,
        )
        self.db.add(new_session)
        self.db.commit()
        self.db.refresh(new_session)
        return new_session

    def get_session_by_id(self, session_id: str) -> Type[ChatSessionModel] | None:
        session = self.db.query(ChatSessionModel).filter_by(id=session_id).first()
        if  session and session.message is None:
            session.message = '[]'
        return session

    def update_session_by_id(self, session_id: str, **kwargs) -> Type[ChatSessionModel] | None:
        session = self.get_session_by_id(session_id)
        if session:
            if "message" in kwargs:
                session.add_message(kwargs["message"])
            # 替换其他字段
            for key, value in kwargs.items():
                if key != "message":
                    setattr(session, key, value)
            session.update_date = current_time()
            try:
                self.db.commit()
                self.db.refresh(session)
            except Exception as e:
                logger.error(e)
                self.db.rollback()
        return session

    def create_session(self, session_id: str, name: str, agent_id: str, agent_type: AgentType, user_id: int) -> ChatSessionModel:
        existing_session = self.get_session_by_id(session_id)
        if existing_session:
            existing_session.add_message({"role": "user", "content": name})
            existing_session.update_date = current_time()
            self.db.commit()
            self.db.refresh(existing_session)
            return existing_session

        new_session = ChatSessionModel(
            id=session_id,
            name=name[0:50],
            agent_id=agent_id,
            agent_type=agent_type,
            tenant_id=user_id,
            message=json.dumps([{"role": "user", "content": name}])
        )
        self.db.add(new_session)
        self.db.commit()
        self.db.refresh(new_session)
        return new_session

    def delete_session(self, session_id: str) -> None:
        """
        删除会话记录。

        参数:
            session_id (str): 会话ID。
        """
        session = self.get_session_by_id(session_id)
        if session:
            self.db.delete(session)
            self.db.commit()