147 lines
4.6 KiB
Python
147 lines
4.6 KiB
Python
"""
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LLM客户端封装
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统一使用OpenAI格式调用
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"""
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import json
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import logging
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import re
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from typing import Optional, Dict, Any, List
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from openai import OpenAI, BadRequestError, APIError
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from ..config import Config
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logger = logging.getLogger(__name__)
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class LLMClient:
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"""LLM客户端"""
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def __init__(
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self,
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api_key: Optional[str] = None,
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base_url: Optional[str] = None,
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model: Optional[str] = None
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):
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self.api_key = api_key or Config.LLM_API_KEY
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self.base_url = base_url or Config.LLM_BASE_URL
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self.model = model or Config.LLM_MODEL_NAME
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self.default_max_tokens = Config.LLM_MAX_TOKENS
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if not self.api_key:
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raise ValueError("LLM_API_KEY 未配置")
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self.client = OpenAI(
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api_key=self.api_key,
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base_url=self.base_url
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)
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@staticmethod
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def _trim_messages(messages: List[Dict[str, str]]) -> List[Dict[str, str]]:
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"""
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当消息列表过长导致上下文溢出时，裁剪中间的历史消息。
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保留第一条（system prompt）和最后几条消息，移除中间部分。
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"""
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if len(messages) <= 4:
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return messages
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# 保留 system prompt（第1条）+ 最近3轮对话（最后6条）
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keep_tail = min(6, len(messages) - 1)
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trimmed = [messages[0]] + messages[-keep_tail:]
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logger.warning(
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f"消息上下文过长，已裁剪: {len(messages)} -> {len(trimmed)} 条消息"
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)
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return trimmed
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def chat(
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self,
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messages: List[Dict[str, str]],
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temperature: float = 0.7,
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max_tokens: Optional[int] = None,
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response_format: Optional[Dict] = None
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) -> str:
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"""
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发送聊天请求
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Args:
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messages: 消息列表
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temperature: 温度参数
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max_tokens: 最大token数（默认使用配置值）
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response_format: 响应格式（如JSON模式）
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Returns:
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模型响应文本
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"""
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if max_tokens is None:
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max_tokens = self.default_max_tokens
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kwargs = {
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"model": self.model,
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"messages": messages,
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"temperature": temperature,
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"max_tokens": max_tokens,
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}
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if response_format:
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kwargs["response_format"] = response_format
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try:
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response = self.client.chat.completions.create(**kwargs)
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except BadRequestError as e:
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error_msg = str(e).lower()
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# 处理上下文长度超限错误：自动裁剪消息后重试一次
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if "context_length" in error_msg or "maximum context" in error_msg or "token" in error_msg:
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logger.warning(
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f"上下文长度超限，尝试裁剪消息后重试: {e}"
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)
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trimmed_messages = self._trim_messages(messages)
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if len(trimmed_messages) == len(messages):
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# 无法进一步裁剪，向上抛出
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raise
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kwargs["messages"] = trimmed_messages
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response = self.client.chat.completions.create(**kwargs)
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else:
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raise
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except APIError as e:
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logger.error(f"LLM API 调用失败: {e}")
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raise
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content = response.choices[0].message.content
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# 部分模型（如MiniMax M2.5）会在content中包含<think>思考内容，需要移除
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content = re.sub(r'<think>[\s\S]*?</think>', '', content).strip()
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return content
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def chat_json(
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self,
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messages: List[Dict[str, str]],
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temperature: float = 0.3,
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max_tokens: Optional[int] = None
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) -> Dict[str, Any]:
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"""
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发送聊天请求并返回JSON
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Args:
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messages: 消息列表
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temperature: 温度参数
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max_tokens: 最大token数（默认使用配置值）
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Returns:
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解析后的JSON对象
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"""
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response = self.chat(
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messages=messages,
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temperature=temperature,
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max_tokens=max_tokens,
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response_format={"type": "json_object"}
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)
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# 清理markdown代码块标记
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cleaned_response = response.strip()
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cleaned_response = re.sub(r'^```(?:json)?\s*\n?', '', cleaned_response, flags=re.IGNORECASE)
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cleaned_response = re.sub(r'\n?```\s*$', '', cleaned_response)
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cleaned_response = cleaned_response.strip()
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try:
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return json.loads(cleaned_response)
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except json.JSONDecodeError:
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raise ValueError(f"LLM返回的JSON格式无效: {cleaned_response}")
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