codefuse-chatbot/coagent/chat/code_chat.py

# encoding: utf-8
'''
@author: 温进
@file: code_chat.py
@time: 2023/10/24 下午4:04
@desc:
'''

from fastapi import Request, Body
import os, asyncio
from typing import List
from fastapi.responses import StreamingResponse

from langchain import LLMChain
from langchain.callbacks import AsyncIteratorCallbackHandler
from langchain.prompts.chat import ChatPromptTemplate

# from configs.model_config import (
#     llm_model_dict, LLM_MODEL, PROMPT_TEMPLATE,
#     VECTOR_SEARCH_TOP_K, SCORE_THRESHOLD, CODE_PROMPT_TEMPLATE)
from coagent.connector.configs.prompts import CODE_PROMPT_TEMPLATE
from coagent.chat.utils import History, wrap_done
from coagent.utils import BaseResponse
from .base_chat import Chat
from coagent.llm_models import getChatModel, getChatModelFromConfig

from coagent.llm_models.llm_config import LLMConfig, EmbedConfig


from coagent.service.cb_api import search_code, cb_exists_api
from loguru import logger
import json


class CodeChat(Chat):

    def __init__(
            self,
            code_base_name: str = '',
            code_limit: int = 1,
            stream: bool = False,
            request: Request = None,
    ) -> None:
        super().__init__(engine_name=code_base_name, stream=stream)
        self.engine_name = code_base_name
        self.code_limit = code_limit
        self.request = request
        self.history_node_list = []

    def check_service_status(self) -> BaseResponse:
        cb = cb_exists_api(self.engine_name)
        if not cb:
            return BaseResponse(code=404, msg=f"未找到代码库 {self.engine_name}")
        return BaseResponse(code=200, msg=f"找到代码库 {self.engine_name}")

    def _process(self, query: str, history: List[History], model, llm_config: LLMConfig, embed_config: EmbedConfig):
        '''process'''

        codes_res = search_code(query=query, cb_name=self.engine_name, code_limit=self.code_limit,
                                search_type=self.cb_search_type,
                                history_node_list=self.history_node_list,
                                api_key=llm_config.api_key,
                                api_base_url=llm_config.api_base_url,
                                model_name=llm_config.model_name,
                                temperature=llm_config.temperature,
                                embed_model=embed_config.embed_model,
                                embed_model_path=embed_config.embed_model_path,
                                embed_engine=embed_config.embed_engine,
                                model_device=embed_config.model_device,
                                )

        context = codes_res['context']
        related_vertices = codes_res['related_vertices']

        # update node names
        # node_names = [node[0] for node in nodes]
        # self.history_node_list.extend(node_names)
        # self.history_node_list = list(set(self.history_node_list))

        source_nodes = []

        for inum, node_name in enumerate(related_vertices[0:5]):
            source_nodes.append(f'{inum + 1}. 节点名: `{node_name}`')

        logger.info('history={}'.format(history))
        logger.info('message={}'.format([i.to_msg_tuple() for i in history] + [("human", CODE_PROMPT_TEMPLATE)]))
        chat_prompt = ChatPromptTemplate.from_messages(
            [i.to_msg_tuple() for i in history] + [("human", CODE_PROMPT_TEMPLATE)]
        )
        logger.info('chat_prompt={}'.format(chat_prompt))
        chain = LLMChain(prompt=chat_prompt, llm=model)
        result = {"answer": "", "codes": source_nodes}
        return chain, context, result

    def chat(
            self,
            query: str = Body(..., description="用户输入", examples=["hello"]),
            history: List[History] = Body(
                [], description="历史对话",
                examples=[[{"role": "user", "content": "我们来玩成语接龙，我先来，生龙活虎"}]]
                ),
            engine_name: str = Body(..., description="知识库名称", examples=["samples"]),
            code_limit: int = Body(1, examples=['1']),
            cb_search_type: str = Body('', examples=['1']),
            stream: bool = Body(False, description="流式输出"),
            local_doc_url: bool = Body(False, description="知识文件返回本地路径(true)或URL(false)"),
            request: Request = None,
            
            api_key: str = Body(os.environ.get("OPENAI_API_KEY")),
            api_base_url: str = Body(os.environ.get("API_BASE_URL")),
            embed_model: str = Body("", ),
            embed_model_path: str = Body("", ),
            embed_engine: str = Body("", ),
            model_name: str = Body("", ),
            temperature: float = Body(0.5, ),
            model_device: str = Body("", ),
            **kargs
            ):
        params = locals()
        params.pop("self")
        llm_config: LLMConfig = LLMConfig(**params)
        embed_config: EmbedConfig = EmbedConfig(**params)
        self.engine_name = engine_name if isinstance(engine_name, str) else engine_name.default
        self.code_limit = code_limit
        self.stream = stream if isinstance(stream, bool) else stream.default
        self.local_doc_url = local_doc_url if isinstance(local_doc_url, bool) else local_doc_url.default
        self.request = request
        self.cb_search_type = cb_search_type
        return self._chat(query, history, llm_config, embed_config, **kargs)

    def _chat(self, query: str, history: List[History], llm_config: LLMConfig, embed_config: EmbedConfig, **kargs):
        history = [History(**h) if isinstance(h, dict) else h for h in history]

        service_status = self.check_service_status()

        if service_status.code != 200: return service_status

        def chat_iterator(query: str, history: List[History]):
            # model = getChatModel()
            model = getChatModelFromConfig(llm_config)

            result, content = self.create_task(query, history, model, llm_config, embed_config, **kargs)
            # logger.info('result={}'.format(result))
            # logger.info('content={}'.format(content))

            if self.stream:
                for token in content["text"]:
                    result["answer"] = token
                    yield json.dumps(result, ensure_ascii=False)
            else:
                for token in content["text"]:
                    result["answer"] += token
                yield json.dumps(result, ensure_ascii=False)

        return StreamingResponse(chat_iterator(query, history),
                                 media_type="text/event-stream")

    def create_task(self, query: str, history: List[History], model, llm_config: LLMConfig, embed_config: EmbedConfig):
        '''构建 llm 生成任务'''
        chain, context, result = self._process(query, history, model, llm_config, embed_config)
        logger.info('chain={}'.format(chain))
        try:
            content = chain({"context": context, "question": query})
        except Exception as e:
            content = {"text": str(e)}
        return result, content

    def create_atask(self, query, history, model, llm_config: LLMConfig, embed_config: EmbedConfig, callback: AsyncIteratorCallbackHandler):
        chain, context, result = self._process(query, history, model, llm_config, embed_config)
        task = asyncio.create_task(wrap_done(
            chain.acall({"context": context, "question": query}), callback.done
        ))
        return task, result