AIChatRoom/backend/adapters/openrouter_adapter.py

"""
OpenRouter适配器
支持通过OpenRouter访问多种AI模型
"""
import json
from datetime import datetime
from typing import List, Dict, Any, Optional, AsyncGenerator
from loguru import logger

from .base_adapter import BaseAdapter, ChatMessage, AdapterResponse
from utils.proxy_handler import get_http_client


class OpenRouterAdapter(BaseAdapter):
    """
    OpenRouter API适配器
    兼容OpenAI API格式
    """
    
    DEFAULT_BASE_URL = "https://openrouter.ai/api/v1"
    
    def __init__(
        self,
        api_key: str,
        base_url: str = "",
        model: str = "openai/gpt-4-turbo",
        use_proxy: bool = False,
        proxy_config: Optional[Dict[str, Any]] = None,
        timeout: int = 60,
        **kwargs
    ):
        super().__init__(
            api_key=api_key,
            base_url=base_url or self.DEFAULT_BASE_URL,
            model=model,
            use_proxy=use_proxy,
            proxy_config=proxy_config,
            timeout=timeout,
            **kwargs
        )
    
    async def chat(
        self,
        messages: List[ChatMessage],
        temperature: float = 0.7,
        max_tokens: int = 2000,
        **kwargs
    ) -> AdapterResponse:
        """发送聊天请求"""
        start_time = datetime.utcnow()
        
        try:
            async with get_http_client(
                use_proxy=self.use_proxy,
                proxy_config=self.proxy_config,
                timeout=self.timeout
            ) as client:
                headers = {
                    "Authorization": f"Bearer {self.api_key}",
                    "Content-Type": "application/json",
                    "HTTP-Referer": kwargs.get("referer", "https://ai-chatroom.local"),
                    "X-Title": kwargs.get("title", "AI ChatRoom")
                }
                
                payload = {
                    "model": self.model,
                    "messages": self._build_messages(messages),
                    "temperature": temperature,
                    "max_tokens": max_tokens,
                    **kwargs
                }
                
                response = await client.post(
                    f"{self.base_url}/chat/completions",
                    headers=headers,
                    json=payload
                )
                
                if response.status_code != 200:
                    error_text = response.text
                    logger.error(f"OpenRouter API错误: {response.status_code} - {error_text}")
                    return AdapterResponse(
                        success=False,
                        error=f"API错误: {response.status_code} - {error_text}",
                        latency_ms=self._calculate_latency(start_time)
                    )
                
                data = response.json()
                choice = data.get("choices", [{}])[0]
                message = choice.get("message", {})
                usage = data.get("usage", {})
                
                return AdapterResponse(
                    success=True,
                    content=message.get("content", ""),
                    model=data.get("model", self.model),
                    finish_reason=choice.get("finish_reason", ""),
                    prompt_tokens=usage.get("prompt_tokens", 0),
                    completion_tokens=usage.get("completion_tokens", 0),
                    total_tokens=usage.get("total_tokens", 0),
                    latency_ms=self._calculate_latency(start_time),
                    tool_calls=message.get("tool_calls", [])
                )
                
        except Exception as e:
            logger.error(f"OpenRouter请求异常: {e}")
            return AdapterResponse(
                success=False,
                error=str(e),
                latency_ms=self._calculate_latency(start_time)
            )
    
    async def chat_stream(
        self,
        messages: List[ChatMessage],
        temperature: float = 0.7,
        max_tokens: int = 2000,
        **kwargs
    ) -> AsyncGenerator[str, None]:
        """发送流式聊天请求"""
        try:
            async with get_http_client(
                use_proxy=self.use_proxy,
                proxy_config=self.proxy_config,
                timeout=self.timeout
            ) as client:
                headers = {
                    "Authorization": f"Bearer {self.api_key}",
                    "Content-Type": "application/json",
                    "HTTP-Referer": kwargs.get("referer", "https://ai-chatroom.local"),
                    "X-Title": kwargs.get("title", "AI ChatRoom")
                }
                
                payload = {
                    "model": self.model,
                    "messages": self._build_messages(messages),
                    "temperature": temperature,
                    "max_tokens": max_tokens,
                    "stream": True,
                    **kwargs
                }
                
                async with client.stream(
                    "POST",
                    f"{self.base_url}/chat/completions",
                    headers=headers,
                    json=payload
                ) as response:
                    async for line in response.aiter_lines():
                        if line.startswith("data: "):
                            data_str = line[6:]
                            if data_str.strip() == "[DONE]":
                                break
                            try:
                                data = json.loads(data_str)
                                delta = data.get("choices", [{}])[0].get("delta", {})
                                content = delta.get("content", "")
                                if content:
                                    yield content
                            except json.JSONDecodeError:
                                continue
                                
        except Exception as e:
            logger.error(f"OpenRouter流式请求异常: {e}")
            yield f"[错误: {str(e)}]"
    
    async def test_connection(self) -> Dict[str, Any]:
        """测试API连接"""
        start_time = datetime.utcnow()
        
        try:
            test_messages = [
                ChatMessage(role="user", content="Hello, respond with 'OK'")
            ]
            
            response = await self.chat(
                messages=test_messages,
                temperature=0,
                max_tokens=10
            )
            
            if response.success:
                return {
                    "success": True,
                    "message": "连接成功",
                    "model": response.model,
                    "latency_ms": response.latency_ms
                }
            else:
                return {
                    "success": False,
                    "message": response.error,
                    "latency_ms": response.latency_ms
                }
                
        except Exception as e:
            return {
                "success": False,
                "message": str(e),
                "latency_ms": self._calculate_latency(start_time)
            }