api/utils.py

from datetime import datetime
import json
from typing import Any, Dict, Optional
import uuid
import asyncio

import httpx
from api import validate
from api.config import MODEL_MAPPING, headers
from fastapi import Depends, security, HTTPException
from fastapi.security import HTTPAuthorizationCredentials

from api.config import APP_SECRET, BASE_URL
from api.models import ChatRequest

from api.logger import setup_logger

logger = setup_logger(__name__)


def create_chat_completion_data(
    content: str, model: str, timestamp: int, finish_reason: Optional[str] = None
) -> Dict[str, Any]:
    return {
        "id": f"chatcmpl-{uuid.uuid4()}",
        "object": "chat.completion.chunk",
        "created": timestamp,
        "model": model,
        "choices": [
            {
                "index": 0,
                "delta": {"content": content, "role": "assistant"},
                "finish_reason": finish_reason,
            }
        ],
        "usage": None,
    }


def verify_app_secret(credentials: HTTPAuthorizationCredentials = Depends(security)):
    if credentials.credentials != APP_SECRET:
        raise HTTPException(status_code=403, detail="Invalid APP_SECRET")
    return credentials.credentials


def message_to_dict(message):
    if isinstance(message.content, str):
        return {"role": message.role, "content": message.content}
    elif isinstance(message.content, list) and len(message.content) == 2:
        if "image_url" in message.content[1]:
            return {
                "role": message.role,
                "content": message.content[0]["text"],
                "data": {
                    "imageBase64": message.content[1]["image_url"]["url"],
                    "fileText": "",
                    "title": "snapshoot",
                },
            }
        else:
            return {
                "role": message.role,
                "content": message.content[0]["text"],
                "data": {
                    "imageBase64": "",
                    "fileText": "",
                    "title": "snapshoot",
                },
            }
    else:
        return {"role": message.role, "content": message.content}


async def process_streaming_response(request: ChatRequest):
    max_retries = 3
    retry_delay = 1
    
    json_data = {
        "messages": [message_to_dict(msg) for msg in request.messages],
        "previewToken": None,
        "userId": None,
        "codeModelMode": True,
        "agentMode": {},
        "trendingAgentMode": {},
        "isMicMode": False,
        "userSystemPrompt": None,
        "maxTokens": request.max_tokens,
        "playgroundTopP": request.top_p,
        "playgroundTemperature": request.temperature,
        "isChromeExt": False,
        "githubToken": None,
        "clickedAnswer2": False,
        "clickedAnswer3": False,
        "clickedForceWebSearch": False,
        "visitFromDelta": False,
        "mobileClient": False,
        "userSelectedModel": MODEL_MAPPING.get(request.model),
        "validated": validate.getHid()
    }

    for attempt in range(max_retries):
        try:
            async with httpx.AsyncClient(timeout=120.0) as client:
                async with client.stream(
                    "POST",
                    f"{BASE_URL}/api/chat",
                    headers=headers,
                    json=json_data,
                ) as response:
                    if response.status_code == 500:
                        # 如果是500错误，尝试刷新hid
                        validate.getHid(True)
                        # 更新json_data中的validated值
                        json_data["validated"] = validate.getHid()
                        if attempt < max_retries - 1:
                            await asyncio.sleep(retry_delay)
                            continue
                        
                    response.raise_for_status()
                    async for line in response.aiter_lines():
                        timestamp = int(datetime.now().timestamp())
                        if line:
                            try:
                                content = line + "\n"
                                if "https://www.blackbox.ai" in content:
                                    validate.getHid(True)
                                    content = "正在刷新会话，请重试\n"
                                    yield f"data: {json.dumps(create_chat_completion_data(content, request.model, timestamp))}\n\n"
                                    yield f"data: {json.dumps(create_chat_completion_data('', request.model, timestamp, 'stop'))}\n\n"
                                    yield "data: [DONE]\n\n"
                                    return

                                if content.startswith("$@$v=undefined-rv1$@$"):
                                    content = content[21:]

                                yield f"data: {json.dumps(create_chat_completion_data(content, request.model, timestamp))}\n\n"
                            except Exception as e:
                                logger.error(f"Error processing line: {e}")
                                continue

                    yield f"data: {json.dumps(create_chat_completion_data('', request.model, timestamp, 'stop'))}\n\n"
                    yield "data: [DONE]\n\n"
                    return

        except httpx.HTTPStatusError as e:
            logger.error(f"HTTP error occurred: {e}")
            if attempt == max_retries - 1:
                error_message = "服务暂时不可用，请稍后重试"
                timestamp = int(datetime.now().timestamp())
                yield f"data: {json.dumps(create_chat_completion_data(error_message, request.model, timestamp))}\n\n"
                yield f"data: {json.dumps(create_chat_completion_data('', request.model, timestamp, 'stop'))}\n\n"
                yield "data: [DONE]\n\n"
                return
            await asyncio.sleep(retry_delay)

        except httpx.RequestError as e:
            logger.error(f"Request error occurred: {e}")
            if attempt == max_retries - 1:
                error_message = "网络连接错误，请检查网络后重试"
                timestamp = int(datetime.now().timestamp())
                yield f"data: {json.dumps(create_chat_completion_data(error_message, request.model, timestamp))}\n\n"
                yield f"data: {json.dumps(create_chat_completion_data('', request.model, timestamp, 'stop'))}\n\n"
                yield "data: [DONE]\n\n"
                return
            await asyncio.sleep(retry_delay)

        except Exception as e:
            logger.error(f"Unexpected error: {e}")
            if attempt == max_retries - 1:
                error_message = "发生未知错误，请重试"
                timestamp = int(datetime.now().timestamp())
                yield f"data: {json.dumps(create_chat_completion_data(error_message, request.model, timestamp))}\n\n"
                yield f"data: {json.dumps(create_chat_completion_data('', request.model, timestamp, 'stop'))}\n\n"
                yield "data: [DONE]\n\n"
                return
            await asyncio.sleep(retry_delay)


async def process_non_streaming_response(request: ChatRequest):
    json_data = {
        "messages": [message_to_dict(msg) for msg in request.messages],
        "previewToken": None,
        "userId": None,
        "codeModelMode": True,
        "agentMode": {},
        "trendingAgentMode": {},
        "isMicMode": False,
        "userSystemPrompt": None,
        "maxTokens": request.max_tokens,
        "playgroundTopP": request.top_p,
        "playgroundTemperature": request.temperature,
        "isChromeExt": False,
        "githubToken": None,
        "clickedAnswer2": False,
        "clickedAnswer3": False,
        "clickedForceWebSearch": False,
        "visitFromDelta": False,
        "mobileClient": False,
        "userSelectedModel": MODEL_MAPPING.get(request.model),
        "validated": validate.getHid()
    }
    full_response = ""
    async with httpx.AsyncClient() as client:
        async with client.stream(
            method="POST", url=f"{BASE_URL}/api/chat", headers=headers, json=json_data
        ) as response:
            async for chunk in response.aiter_text():
                full_response += chunk
    if "https://www.blackbox.ai" in full_response:
        validate.getHid(True)
        full_response = "hid已刷新，重新对话即可"
    if full_response.startswith("$@$v=undefined-rv1$@$"):
        full_response = full_response[21:]
    return {
        "id": f"chatcmpl-{uuid.uuid4()}",
        "object": "chat.completion",
        "created": int(datetime.now().timestamp()),
        "model": request.model,
        "choices": [
            {
                "index": 0,
                "message": {"role": "assistant", "content": full_response},
                "finish_reason": "stop",
            }
        ],
        "usage": None,
    }