408 lines
18 KiB
Python
408 lines
18 KiB
Python
import asyncio
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import json
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import re
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from datetime import datetime
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from typing import Tuple, Union
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import aiohttp
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from loguru import logger
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from nonebot import get_driver
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from ...common.database import Database
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from ..chat.config import global_config
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from ..chat.utils_image import compress_base64_image_by_scale
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driver = get_driver()
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config = driver.config
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class LLM_request:
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def __init__(self, model, **kwargs):
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# 将大写的配置键转换为小写并从config中获取实际值
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try:
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self.api_key = getattr(config, model["key"])
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self.base_url = getattr(config, model["base_url"])
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except AttributeError as e:
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logger.error(f"配置错误：找不到对应的配置项 - {str(e)}")
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raise ValueError(f"配置错误：找不到对应的配置项 - {str(e)}") from e
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self.model_name = model["name"]
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self.params = kwargs
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self.pri_in = model.get("pri_in", 0)
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self.pri_out = model.get("pri_out", 0)
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# 获取数据库实例
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self.db = Database.get_instance()
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self._init_database()
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def _init_database(self):
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"""初始化数据库集合"""
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try:
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# 创建llm_usage集合的索引
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self.db.db.llm_usage.create_index([("timestamp", 1)])
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self.db.db.llm_usage.create_index([("model_name", 1)])
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self.db.db.llm_usage.create_index([("user_id", 1)])
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self.db.db.llm_usage.create_index([("request_type", 1)])
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except Exception as e:
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logger.error(f"创建数据库索引失败: {e}")
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def _record_usage(self, prompt_tokens: int, completion_tokens: int, total_tokens: int,
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user_id: str = "system", request_type: str = "chat",
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endpoint: str = "/chat/completions"):
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"""记录模型使用情况到数据库
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Args:
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prompt_tokens: 输入token数
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completion_tokens: 输出token数
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total_tokens: 总token数
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user_id: 用户ID，默认为system
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request_type: 请求类型(chat/embedding/image等)
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endpoint: API端点
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"""
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try:
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usage_data = {
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"model_name": self.model_name,
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"user_id": user_id,
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"request_type": request_type,
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"endpoint": endpoint,
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"prompt_tokens": prompt_tokens,
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"completion_tokens": completion_tokens,
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"total_tokens": total_tokens,
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"cost": self._calculate_cost(prompt_tokens, completion_tokens),
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"status": "success",
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"timestamp": datetime.now()
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}
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self.db.db.llm_usage.insert_one(usage_data)
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logger.info(
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f"Token使用情况 - 模型: {self.model_name}, "
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f"用户: {user_id}, 类型: {request_type}, "
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f"提示词: {prompt_tokens}, 完成: {completion_tokens}, "
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f"总计: {total_tokens}"
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)
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except Exception as e:
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logger.error(f"记录token使用情况失败: {e}")
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def _calculate_cost(self, prompt_tokens: int, completion_tokens: int) -> float:
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"""计算API调用成本
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使用模型的pri_in和pri_out价格计算输入和输出的成本
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Args:
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prompt_tokens: 输入token数量
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completion_tokens: 输出token数量
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Returns:
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float: 总成本（元）
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"""
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# 使用模型的pri_in和pri_out计算成本
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input_cost = (prompt_tokens / 1000000) * self.pri_in
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output_cost = (completion_tokens / 1000000) * self.pri_out
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return round(input_cost + output_cost, 6)
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async def _execute_request(
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self,
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endpoint: str,
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prompt: str = None,
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image_base64: str = None,
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payload: dict = None,
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retry_policy: dict = None,
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response_handler: callable = None,
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user_id: str = "system",
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request_type: str = "chat"
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):
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"""统一请求执行入口
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Args:
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endpoint: API端点路径 (如 "chat/completions")
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prompt: prompt文本
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image_base64: 图片的base64编码
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payload: 请求体数据
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retry_policy: 自定义重试策略
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response_handler: 自定义响应处理器
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user_id: 用户ID
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request_type: 请求类型
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"""
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# 合并重试策略
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default_retry = {
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"max_retries": 3, "base_wait": 15,
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"retry_codes": [429, 413, 500, 503],
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"abort_codes": [400, 401, 402, 403]}
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policy = {**default_retry, **(retry_policy or {})}
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# 常见Error Code Mapping
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error_code_mapping = {
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400: "参数不正确",
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401: "API key 错误，认证失败",
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402: "账号余额不足",
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403: "需要实名,或余额不足",
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404: "Not Found",
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429: "请求过于频繁，请稍后再试",
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500: "服务器内部故障",
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503: "服务器负载过高"
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}
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api_url = f"{self.base_url.rstrip('/')}/{endpoint.lstrip('/')}"
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#判断是否为流式
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stream_mode = self.params.get("stream", False)
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if self.params.get("stream", False) is True:
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logger.info(f"进入流式输出模式，发送请求到URL: {api_url}")
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else:
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logger.info(f"发送请求到URL: {api_url}")
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logger.info(f"使用模型: {self.model_name}")
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# 构建请求体
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if image_base64:
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payload = await self._build_payload(prompt, image_base64)
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elif payload is None:
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payload = await self._build_payload(prompt)
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for retry in range(policy["max_retries"]):
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try:
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# 使用上下文管理器处理会话
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headers = await self._build_headers()
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#似乎是openai流式必须要的东西,不过阿里云的qwq-plus加了这个没有影响
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if stream_mode:
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headers["Accept"] = "text/event-stream"
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async with aiohttp.ClientSession() as session:
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async with session.post(api_url, headers=headers, json=payload) as response:
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# 处理需要重试的状态码
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if response.status in policy["retry_codes"]:
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wait_time = policy["base_wait"] * (2 ** retry)
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logger.warning(f"错误码: {response.status}, 等待 {wait_time}秒后重试")
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if response.status == 413:
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logger.warning("请求体过大，尝试压缩...")
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image_base64 = compress_base64_image_by_scale(image_base64)
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payload = await self._build_payload(prompt, image_base64)
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elif response.status in [500, 503]:
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logger.error(f"错误码: {response.status} - {error_code_mapping.get(response.status)}")
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raise RuntimeError("服务器负载过高，模型恢复失败QAQ")
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else:
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logger.warning(f"请求限制(429)，等待{wait_time}秒后重试...")
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await asyncio.sleep(wait_time)
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continue
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elif response.status in policy["abort_codes"]:
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logger.error(f"错误码: {response.status} - {error_code_mapping.get(response.status)}")
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raise RuntimeError(f"请求被拒绝: {error_code_mapping.get(response.status)}")
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response.raise_for_status()
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#将流式输出转化为非流式输出
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if stream_mode:
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accumulated_content = ""
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async for line_bytes in response.content:
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line = line_bytes.decode("utf-8").strip()
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if not line:
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continue
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if line.startswith("data:"):
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data_str = line[5:].strip()
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if data_str == "[DONE]":
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break
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try:
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chunk = json.loads(data_str)
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delta = chunk["choices"][0]["delta"]
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delta_content = delta.get("content")
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if delta_content is None:
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delta_content = ""
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accumulated_content += delta_content
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except Exception as e:
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logger.error(f"解析流式输出错误: {e}")
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content = accumulated_content
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reasoning_content = ""
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think_match = re.search(r'<think>(.*?)</think>', content, re.DOTALL)
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if think_match:
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reasoning_content = think_match.group(1).strip()
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content = re.sub(r'<think>.*?</think>', '', content, flags=re.DOTALL).strip()
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# 构造一个伪result以便调用自定义响应处理器或默认处理器
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result = {"choices": [{"message": {"content": content, "reasoning_content": reasoning_content}}]}
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return response_handler(result) if response_handler else self._default_response_handler(result, user_id, request_type, endpoint)
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else:
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result = await response.json()
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# 使用自定义处理器或默认处理
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return response_handler(result) if response_handler else self._default_response_handler(result, user_id, request_type, endpoint)
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except Exception as e:
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if retry < policy["max_retries"] - 1:
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wait_time = policy["base_wait"] * (2 ** retry)
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logger.error(f"请求失败，等待{wait_time}秒后重试... 错误: {str(e)}")
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await asyncio.sleep(wait_time)
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else:
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logger.critical(f"请求失败: {str(e)}")
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logger.critical(f"请求头: {await self._build_headers(no_key=True)} 请求体: {payload}")
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raise RuntimeError(f"API请求失败: {str(e)}")
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logger.error("达到最大重试次数，请求仍然失败")
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raise RuntimeError("达到最大重试次数，API请求仍然失败")
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async def _transform_parameters(self, params: dict) ->dict:
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"""
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根据模型名称转换参数：
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- 对于需要转换的OpenAI CoT系列模型（例如 "o3-mini"），删除 'temprature' 参数，
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并将 'max_tokens' 重命名为 'max_completion_tokens'
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"""
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# 复制一份参数，避免直接修改原始数据
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new_params = dict(params)
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# 定义需要转换的模型列表
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models_needing_transformation = ["o3-mini", "o1-mini", "o1-preview", "o1-2024-12-17", "o1-preview-2024-09-12", "o3-mini-2025-01-31", "o1-mini-2024-09-12"]
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if self.model_name.lower() in models_needing_transformation:
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# 删除 'temprature' 参数（如果存在）
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new_params.pop("temperature", None)
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# 如果存在 'max_tokens'，则重命名为 'max_completion_tokens'
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if "max_tokens" in new_params:
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new_params["max_completion_tokens"] = new_params.pop("max_tokens")
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return new_params
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async def _build_payload(self, prompt: str, image_base64: str = None) -> dict:
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"""构建请求体"""
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# 复制一份参数，避免直接修改 self.params
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params_copy = await self._transform_parameters(self.params)
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if image_base64:
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payload = {
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"model": self.model_name,
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"messages": [
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{
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"role": "user",
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"content": [
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{"type": "text", "text": prompt},
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{"type": "image_url", "image_url": {"url": f"data:image/jpeg;base64,{image_base64}"}}
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]
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}
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],
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"max_tokens": global_config.max_response_length,
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**params_copy
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}
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else:
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payload = {
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"model": self.model_name,
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"messages": [{"role": "user", "content": prompt}],
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"max_tokens": global_config.max_response_length,
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**params_copy
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}
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# 如果 payload 中依然存在 max_tokens 且需要转换，在这里进行再次检查
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if self.model_name.lower() in ["o3-mini", "o1-mini", "o1-preview", "o1-2024-12-17", "o1-preview-2024-09-12", "o3-mini-2025-01-31", "o1-mini-2024-09-12"] and "max_tokens" in payload:
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payload["max_completion_tokens"] = payload.pop("max_tokens")
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return payload
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def _default_response_handler(self, result: dict, user_id: str = "system",
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request_type: str = "chat", endpoint: str = "/chat/completions") -> Tuple:
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"""默认响应解析"""
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if "choices" in result and result["choices"]:
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message = result["choices"][0]["message"]
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content = message.get("content", "")
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content, reasoning = self._extract_reasoning(content)
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reasoning_content = message.get("model_extra", {}).get("reasoning_content", "")
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if not reasoning_content:
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reasoning_content = message.get("reasoning_content", "")
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if not reasoning_content:
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reasoning_content = reasoning
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# 记录token使用情况
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usage = result.get("usage", {})
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if usage:
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prompt_tokens = usage.get("prompt_tokens", 0)
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completion_tokens = usage.get("completion_tokens", 0)
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total_tokens = usage.get("total_tokens", 0)
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self._record_usage(
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prompt_tokens=prompt_tokens,
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completion_tokens=completion_tokens,
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total_tokens=total_tokens,
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user_id=user_id,
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request_type=request_type,
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endpoint=endpoint
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)
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return content, reasoning_content
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return "没有返回结果", ""
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def _extract_reasoning(self, content: str) -> tuple[str, str]:
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"""CoT思维链提取"""
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match = re.search(r'(?:<think>)?(.*?)</think>', content, re.DOTALL)
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content = re.sub(r'(?:<think>)?.*?</think>', '', content, flags=re.DOTALL, count=1).strip()
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if match:
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reasoning = match.group(1).strip()
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else:
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reasoning = ""
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return content, reasoning
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async def _build_headers(self, no_key: bool = False) -> dict:
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"""构建请求头"""
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if no_key:
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return {
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"Authorization": f"Bearer **********",
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"Content-Type": "application/json"
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}
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else:
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return {
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"Authorization": f"Bearer {self.api_key}",
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"Content-Type": "application/json"
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}
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# 防止小朋友们截图自己的key
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async def generate_response(self, prompt: str) -> Tuple[str, str]:
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"""根据输入的提示生成模型的异步响应"""
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content, reasoning_content = await self._execute_request(
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endpoint="/chat/completions",
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prompt=prompt
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)
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return content, reasoning_content
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async def generate_response_for_image(self, prompt: str, image_base64: str) -> Tuple[str, str]:
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"""根据输入的提示和图片生成模型的异步响应"""
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content, reasoning_content = await self._execute_request(
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endpoint="/chat/completions",
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prompt=prompt,
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image_base64=image_base64
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)
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return content, reasoning_content
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async def generate_response_async(self, prompt: str, **kwargs) -> Union[str, Tuple[str, str]]:
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"""异步方式根据输入的提示生成模型的响应"""
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# 构建请求体
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data = {
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"model": self.model_name,
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"messages": [{"role": "user", "content": prompt}],
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"max_tokens": global_config.max_response_length,
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**self.params
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}
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content, reasoning_content = await self._execute_request(
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endpoint="/chat/completions",
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payload=data,
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prompt=prompt
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)
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return content, reasoning_content
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async def get_embedding(self, text: str) -> Union[list, None]:
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"""异步方法：获取文本的embedding向量
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Args:
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text: 需要获取embedding的文本
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Returns:
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list: embedding向量，如果失败则返回None
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"""
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def embedding_handler(result):
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"""处理响应"""
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if "data" in result and len(result["data"]) > 0:
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return result["data"][0].get("embedding", None)
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return None
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embedding = await self._execute_request(
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endpoint="/embeddings",
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prompt=text,
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payload={
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"model": self.model_name,
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"input": text,
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"encoding_format": "float"
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},
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retry_policy={
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"max_retries": 2,
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"base_wait": 6
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},
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response_handler=embedding_handler
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)
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return embedding
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