rag-gateway/app/service/difyService.py

import json
from datetime import datetime

import httpx
from typing import Union, Dict, List
from fastapi import HTTPException
from starlette import status

from app.config.config import settings
from app.utils.rsa_crypto import RagflowCrypto


class DifyService:
    def __init__(self, base_url: str):
        self.base_url = base_url

    def _handle_response(self, response: httpx.Response) -> Union[Dict, List]:
        if response.status_code != 200:
            if response.status_code == 201:
                return response.json()
            return {}

        data = response.json()
        ret_code = data.get("retcode")
        if ret_code == 401:
            raise HTTPException(
                status_code=status.HTTP_401_UNAUTHORIZED,
                detail="登录过期",
            )
        # if ret_code != 0:
        #     return {}

        # 检查返回的数据类型
        if isinstance(data.get("data"), dict):
            return data.get("data", {})
        elif isinstance(data.get("data"), list):
            return data.get("data", [])
        else:
            return data

    async def register(self, username: str, password: str):
        password = RagflowCrypto(settings.PUBLIC_KEY, settings.PRIVATE_KEY).encrypt(password)
        async with httpx.AsyncClient() as client:
            response = await client.post(
                f"{self.base_url}/v1/user/register",
                headers={'Content-Type': 'application/json'},
                json={"nickname": username, "email":  f"{username}@example.com", "password": password}
            )
            if response.status_code != 200:
                raise Exception(f"Ragflow registration failed: {response.text}")
            return self._handle_response(response)

    async def login(self, username: str, password: str) -> str:
        password = RagflowCrypto(settings.PUBLIC_KEY, settings.PRIVATE_KEY).encrypt(password)
        async with httpx.AsyncClient() as client:
            response = await client.post(
                f"{self.base_url}/v1/user/login",
                headers={'Content-Type': 'application/json'},
                json={"email": f"{username}@example.com", "password": password}
            )
            if response.status_code != 200:
                raise Exception(f"Ragflow login failed: {response.text}")
            authorization = response.headers.get('Authorization')
            if not authorization:
                raise Exception("Authorization header not found in response")
            return authorization

    async def chat(self, token: str, user_id: int,  message: str, upload_file_id: str, conversation_id: str):

        target_url = f"{self.base_url}/v1/chat-messages"
        files = []
        if upload_file_id:
            files = [
                {
                    "type": "image",
                    "transfer_method": "local_file",
                    "url": "",
                    "upload_file_id": upload_file_id
                }
            ]
        data = {
            "inputs": {},
            "query": message,
            "response_mode": "streaming",
            "conversation_id": conversation_id,
            "user": str(user_id),
            "files": files
        }

        async with httpx.AsyncClient(timeout=300.0) as client:
            headers = {
                'Content-Type': 'application/json',
                'Authorization': f'Bearer {token}'
            }
            async with client.stream("POST", target_url, data=json.dumps(data), headers=headers) as response:
                if response.status_code == 200:
                    try:
                        async for answer in response.aiter_text():
                            # print(f"response of ragflow chat: {answer}")
                            yield answer
                    except GeneratorExit as e:
                        print(e)
                        return
                else:
                    yield f"Error: {response.status_code}"



    async def get_session_history(self, token: str, conversation_id: str, user: str):
        url = f"{self.base_url}/v1/messages"
        params = {
            'user': user,
            'conversation_id': conversation_id
        }
        headers = {"Authorization": f'Bearer {token}'}
        async with httpx.AsyncClient() as client:
            response = await client.get(url, params=params, headers=headers)
            # print(response.text)
            # print(response.status_code)
            # print(response.res)
            data = self._handle_response(response)
            # print("----------------data----------------------:", data)

            return data

    async def upload(self, token: str, filename: str, file: bytes, user_id) -> dict:
        url = f"{self.base_url}/v1/files/upload"
        headers = {
            # 'Content-Type': 'application/json',
            'Authorization': f'Bearer {token}'
        }
        data = {
            'user': str(user_id)
        }
        # 创建表单数据，包含文件
        files = {"file": (filename, file)}
        async with httpx.AsyncClient() as client:
            response = await client.post(url, headers=headers, files=files, data=data)
            data = self._handle_response(response)

            return data

    async def save_images(self, url: str, filename: str):
        url = f"{self.base_url}{url}"

        async with httpx.AsyncClient() as client:
            response = await client.get(url)

            response.raise_for_status()

            # 打开一个文件用于写入
            with open(f"app/images/{filename}", 'wb') as f:
                # 写入请求的内容
                f.write(response.content)


    async def workflow(self, token: str, user_id: int,  inputs: dict):

        target_url = f"{self.base_url}/v1/workflows/run"
        data = {
            "inputs": inputs,
            "response_mode": "streaming",
            "user": str(user_id),
            "files":[]
        }

        async with httpx.AsyncClient(timeout=1800) as client:
            headers = {
                'Content-Type': 'application/json',
                'Authorization': f'Bearer {token}'
            }
            async with client.stream("POST", target_url, data=json.dumps(data), headers=headers) as response:
                if response.status_code == 200:
                    try:
                        async for answer in response.aiter_text():
                            # print(f"response of ragflow chat: {answer}")
                            yield answer
                    except GeneratorExit as e:
                        print(e)
                        return
                else:
                    yield f"Error: {response.status_code}"



if __name__ == "__main__":
    async def a():
        a = DifyService("http://192.168.20.116")
        b = await a.get_session_history("app-YmOAMDsPpDDlqryMHnc9TzTO", "f94c6328-8ff0-4713-af3f-e823d547682d",
                                 "63")
        print(b)

    import asyncio

    asyncio.run(a())