TakwayDisplayPlatform/main.py

from fastapi import FastAPI, Depends, WebSocket, HTTPException
from fastapi.middleware.cors import CORSMiddleware
from config import Config
from app.concrete import Agent
from app.model import Assistant, User, get_db, get_db_context
from app.schemas import *
from app.dependency import get_logger
from app.exception import *
import asyncio
import uvicorn
import uuid
import json
import time


# 公共函数 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------
def update_messages(assistant, kid_text, llm_text):
    messages = json.loads(assistant.messages)
    if not kid_text:
        raise AsrResultNoneError()
    if not llm_text:
        raise LlmResultNoneError()
    messages.append({"role":"user","content":kid_text})
    messages.append({"role":"assistant","content":llm_text})
    with get_db_context() as db:
        db.query(Assistant).filter(Assistant.id == assistant.id).update({"messages":json.dumps(messages,ensure_ascii=False),"token":assistant.token})
        db.commit()
# --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

# 引入logger对象
logger = get_logger()

# 创建FastAPI实例
app = FastAPI()

# 增删查改 assiatant----------------------------------------------------------------------------------------------------------------------------------------------------------------
# 创建一个assistant
@app.post("/api/assistants")
async def create_assistant(request: create_assistant_request,db=Depends(get_db)):
    id = str(uuid.uuid4())
    messages = json.dumps([{"role":"system","content":request.system_prompt}],ensure_ascii=False)
    assistant = Assistant(id=id,user_id=request.user_id, name=request.name, system_prompt=request.system_prompt, messages=messages,
                          user_info=request.user_info, llm_info=request.llm_info, tts_info=request.tts_info, token=0)
    db.add(assistant)
    db.commit()
    return {"code":200,"msg":"success","data":{"id":id}}

# 删除一个assistant
@app.delete("/api/assistants/{id}")
async def delete_assistant(id: str,db=Depends(get_db)):
    assistant = db.query(Assistant).filter(Assistant.id == id).first()
    if assistant:
        db.delete(assistant)
        db.commit()
        return {"code":200,"msg":"success","data":{}}
    else:
        return {"code":404,'msg':"assistant not found","data":{}}

# 更新一个assistant
@app.put("/api/assistants/{id}")
async def update_assistant(id: str,request: update_assistant_request,db=Depends(get_db)):
    assistant = db.query(Assistant).filter(Assistant.id == id).first()
    if assistant:
        assistant.name = request.name
        assistant.system_prompt = request.system_prompt
        assistant.messages = request.messages
        assistant.user_info = request.user_info
        assistant.llm_info = request.llm_info
        assistant.tts_info = request.tts_info
        db.commit()
        return {"code":200,"msg":"success","data":{}}
    else:
        return {"code":404,'msg':"assistant not found","data":{}}

# 获取一个assistant
@app.get("/api/assistants/{id}")
async def get_assistant(id: str,db=Depends(get_db)):
    assistant = db.query(Assistant).filter(Assistant.id == id).first()
    if assistant:
        return {"code":200,"msg":"success","data":assistant}
    else:
        return {"code":404,'msg':"assistant not found","data":{}}

# 获取所有的assistant名称和id
@app.get("/api/assistants")
async def get_all_assistants_name_id(db=Depends(get_db)):
    assistants = db.query(Assistant.id, Assistant.name).all()
    return {"code":200,"msg":"success","data":[{"id": assistant.id, "name": assistant.name} for assistant in assistants]}

# 重置一个assistant的消息
@app.post("/api/assistants/{id}/reset_msg")
async def reset_assistant_msg(id: str,db=Depends(get_db)):
    assistant = db.query(Assistant).filter(Assistant.id == id).first()
    if assistant:
        assistant.messages = json.dumps([{"role":"system","content":assistant.system_prompt}],ensure_ascii=False)
        db.commit()
        return {"code":200,"msg":"success","data":{}}
    else:
        return {"code":404,'msg':"assistant not found","data":{}}

# 修改一个assistant的system_prompt
@app.put("/api/assistants/{id}/system_prompt")
async def update_assistant_system_prompt(id: str,request: update_assistant_system_prompt_request,db=Depends(get_db)):
    assistant = db.query(Assistant).filter(Assistant.id == id).first()
    if assistant:
        assistant.system_prompt = request.system_prompt
        assistant.messages = json.dumps([{"role":"system","content":assistant.system_prompt}],ensure_ascii=False)
        db.commit()
        return {"code":200,"msg":"success","data":{}}
    else:
        return {"code":404,'msg':"assistant not found","data":{}}

# 更新具体参数
@app.put("/api/assistants/{id}/deatil_params")
async def update_assistant_deatil_params(id: str,request: update_assistant_deatil_params_request,db=Depends(get_db)):
    assistant = db.query(Assistant).filter(Assistant.id == id).first()
    if assistant:
        llm_info = json.loads(assistant.llm_info)
        tts_info = json.loads(assistant.tts_info)
        user_info = json.loads(assistant.user_info)
        llm_info['model'] = request.model
        llm_info['temperature'] = request.temperature
        tts_info['speaker_id'] = request.speaker_id
        tts_info['length_scale'] = request.length_scale
        user_info['llm_type'] = request.platform
        assistant.llm_info = json.dumps(llm_info, ensure_ascii=False)
        assistant.tts_info = json.dumps(tts_info, ensure_ascii=False)
        assistant.user_info = json.dumps(user_info, ensure_ascii=False)
        db.commit()
        return {"code":200,"msg":"success","data":{}}
    else:
        return {"code":404,'msg':"assistant not found","data":{}}

# 更新max_tokens
@app.put("/api/assistants/{id}/max_tokens")
async def update_assistant_max_tokens(id: str,request: update_assistant_max_tokens_request,db=Depends(get_db)):
    assistant = db.query(Assistant).filter(Assistant.id == id).first()
    if assistant:
        llm_info = json.loads(assistant.llm_info)
        llm_info['max_tokens'] = request.max_tokens
        assistant.llm_info = json.dumps(llm_info, ensure_ascii=False)
        db.commit()
        return {"code":200,"msg":"success","data":{}}
    else:
        return {"code":404,'msg':"assistant not found","data":{}}
# --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



# 用户增删改查接口 ----------------------------------------------------------------------------------------------------------------------------------------------------------------
# 添加用户
@app.post("/api/users")
async def create_user(request: create_user_request,db=Depends(get_db)):
    id = str(uuid.uuid4())
    user = User(id=id, name=request.name, email=request.email, password=request.password)
    db.add(user)
    db.commit()
    return {"code":200,"msg":"success","data":{"id":id}}

# 删除用户
@app.delete("/api/users/{id}")
async def delete_user(id: str,db=Depends(get_db)):
    user = db.query(User).filter(User.id == id).first()
    if user:
        db.delete(user)
        db.commit()
        return {"code":200,"msg":"success","data":{}}
    else:
        raise HTTPException(status_code=404, detail="user not found")

# 获取用户
@app.get("/api/users/{id}")
async def get_user(id: str,db=Depends(get_db)):
    user = db.query(User).filter(User.id == id).first()
    if user:
        return {"code":200,"msg":"success","data":user}
    else:
        raise HTTPException(status_code=404, detail="user not found")

# 获取所有用户
@app.get("/api/users")
async def get_all_users(db=Depends(get_db)):
    users = db.query(User).all()
    return {"code":200,"msg":"success","data":users}

# 更新用户
@app.put("/api/users/{id}")
async def update_user(id: str,request: update_user_request,db=Depends(get_db)):
    user = db.query(User).filter(User.id == id).first()
    if user:
        user.name = request.name
        user.email = request.email
        user.password = request.password
        db.commit()
        return {"code":200,"msg":"success","data":{}}
    else:
        raise HTTPException(status_code=404, detail="user not found")
# --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

# 流式聊天websokct接口 ------------------------------------------------------------------------------------------------------------------------------------------------------------
@app.websocket("/api/chat/streaming/temporary")
async def streaming_chat(ws: WebSocket):
    await ws.accept()
    logger.debug("WebSocket连接成功")
    try:
        agent = None
        assistant = None
        asr_results = []
        llm_text = ""
        logger.debug("开始进行ASR识别")
        while len(asr_results)==0:
            chunk =  json.loads(await asyncio.wait_for(ws.receive_text(),timeout=1))
            if assistant is None:
                with get_db_context() as db:    #使用with语句获取数据库连接，自动关闭数据库连接
                    assistant = db.query(Assistant).filter(Assistant.id == chunk['meta_info']['session_id']).first()
                    logger.debug(f"接收到{assistant.name}的请求")
                if assistant is None:
                    raise SessionNotFoundError()
                user_info = json.loads(assistant.user_info)
            if not agent:
                agent = Agent(asr_type=user_info['asr_type'], llm_type=user_info['llm_type'], tts_type=user_info['tts_type'])
                agent.init_recorder(assistant.user_id)
            chunk["audio"] = agent.user_audio_process(chunk["audio"])
            asr_results = await agent.stream_recognize(assistant, chunk)
        kid_text = asr_results[0]['text'] #asr结果的[0]默认为孩子(主要用户)的asr结果
        prompt = agent.prompt_process(asr_results)
        agent.recorder.input_text = prompt
        logger.debug("开始调用大模型")
        llm_frames = await agent.chat(assistant, prompt)
        
        start_time = time.time()
        is_first_response = True
        
        for llm_frame in llm_frames:
            if is_first_response:
                end_time = time.time()
                logger.debug(f"第一帧返回耗时：{round(end_time-start_time,3)}s")
                is_first_response = False
            resp_msgs = agent.llm_msg_process(llm_frame)
            for resp_msg in resp_msgs: 
                llm_text += resp_msg
                tts_audio = agent.synthetize(assistant, resp_msg)
                agent.tts_audio_process(tts_audio)
                await ws.send_bytes(agent.encode(resp_msg, tts_audio))
                logger.debug(f'websocket返回：{resp_msg}')
        logger.debug(f"大模型返回结束，返回结果为：{llm_text}")
        await ws.send_text(json.dumps({"type": "close", "code": 200, "msg": ""}, ensure_ascii=False))
        logger.debug("结束帧发送完毕")
        update_messages(assistant, kid_text ,llm_text)
        logger.debug("聊天更新成功")
        agent.recorder.output_text = llm_text
        agent.save()
        logger.debug("音频保存成功")
    except EnterSlienceMode:
        tts_audio = agent.synthetize(assistant, "已进入沉默模式")
        await ws.send_bytes(agent.encode("已进入沉默模式", tts_audio))
        await ws.send_text(json.dumps({"type":"info","code":201,"msg":"进入沉默模式"}, ensure_ascii=False))
        logger.debug("进入沉默模式")
    except AsrResultNoneError:
        await ws.send_text(json.dumps({"type":"error","code":501,"msg":"asr结果为空"}, ensure_ascii=False))
        logger.error("ASR结果为空")
    except AbnormalLLMFrame as e:
        await ws.send_text(json.dumps({"type":"error","code":502,"msg":str(e)}, ensure_ascii=False))
        logger.error(f"LLM模型返回异常，错误信息：{str(e)}")
    except SideNoiseError as e:
        await ws.send_text(json.dumps({"type":"error","code":503,"msg":"检测为噪声"}, ensure_ascii=False))
        logger.debug("检测为噪声")
    except SessionNotFoundError:
        await ws.send_text(json.dumps({"type":"error","code":504,"msg":"session不存在"}, ensure_ascii=False))
        logger.error("session不存在")
    except UnknownVolcEngineModelError:
        await ws.send_text(json.dumps({"type":"error","code":505,"msg":"未知的火山引擎模型"}, ensure_ascii=False))
        logger.error("未知的火山引擎模型")
    except LlmResultNoneError:
        await ws.send_text(json.dumps({"type":"error","code":506,"msg":"llm结果返回为空"}, ensure_ascii=False))
        logger.error("LLM结果返回为空")
    except asyncio.TimeoutError:
        await ws.send_text(json.dumps({"type":"error","code":507,"msg":"接收超时"}, ensure_ascii=False))
        logger.error("接收超时")
    logger.debug("WebSocket连接断开")
    logger.debug("")
    await ws.close()
# --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],  # 允许所有源，也可以指定特定源
    allow_credentials=True,
    allow_methods=["*"],  # 允许所有方法
    allow_headers=["*"],  # 允许所有头
)

# 启动服务
uvicorn.run(app, host=Config.UVICORN.HOST, port=Config.UVICORN.PORT)