mirror of
https://github.com/snailyp/gemini-balance.git
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300 lines
12 KiB
Python
300 lines
12 KiB
Python
# app/services/chat_service.py
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import json
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from copy import deepcopy
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from typing import Any, AsyncGenerator, Dict, List, Optional, Union
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from app.config.config import settings
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from app.domain.openai_models import ChatRequest, ImageGenerationRequest
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from app.handler.message_converter import OpenAIMessageConverter
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from app.handler.response_handler import OpenAIResponseHandler
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from app.handler.stream_optimizer import openai_optimizer
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from app.log.logger import get_openai_logger
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from app.service.client.api_client import GeminiApiClient
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from app.service.image.image_create_service import ImageCreateService
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from app.service.key.key_manager import KeyManager
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logger = get_openai_logger()
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def _has_image_parts(contents: List[Dict[str, Any]]) -> bool:
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"""判断消息是否包含图片部分"""
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for content in contents:
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if "parts" in content:
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for part in content["parts"]:
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if "image_url" in part or "inline_data" in part:
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return True
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return False
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def _build_tools(
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request: ChatRequest, messages: List[Dict[str, Any]]
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) -> List[Dict[str, Any]]:
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"""构建工具"""
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tool = dict()
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model = request.model
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if (
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settings.TOOLS_CODE_EXECUTION_ENABLED
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and not (
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model.endswith("-search")
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or "-thinking" in model
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or model.endswith("-image")
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or model.endswith("-image-generation")
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)
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and not _has_image_parts(messages)
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):
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tool["codeExecution"] = {}
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if model.endswith("-search"):
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tool["googleSearch"] = {}
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# 将 request 中的 tools 合并到 tools 中
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if request.tools:
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function_declarations = []
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for item in request.tools:
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if not item or not isinstance(item, dict):
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continue
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if item.get("type", "") == "function" and item.get("function"):
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function = deepcopy(item.get("function"))
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parameters = function.get("parameters", {})
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if parameters.get("type") == "object" and not parameters.get("properties", {}):
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function.pop("parameters", None)
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function_declarations.append(function)
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if function_declarations:
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# 按照 function 的 name 去重
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names, functions = set(), []
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for fc in function_declarations:
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if fc.get("name") not in names:
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names.add(fc.get("name"))
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functions.append(fc)
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tool["functionDeclarations"] = functions
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# 解决 "Tool use with function calling is unsupported" 问题
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if tool.get("functionDeclarations"):
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tool.pop("googleSearch", None)
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tool.pop("codeExecution", None)
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return [tool]
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def _get_safety_settings(model: str) -> List[Dict[str, str]]:
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"""获取安全设置"""
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# if (
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# "2.0" in model
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# and "gemini-2.0-flash-thinking-exp" not in model
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# and "gemini-2.0-pro-exp" not in model
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# ):
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if model == "gemini-2.0-flash-exp":
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return [
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{"category": "HARM_CATEGORY_HARASSMENT", "threshold": "OFF"},
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{"category": "HARM_CATEGORY_HATE_SPEECH", "threshold": "OFF"},
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{"category": "HARM_CATEGORY_SEXUALLY_EXPLICIT", "threshold": "OFF"},
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{"category": "HARM_CATEGORY_DANGEROUS_CONTENT", "threshold": "OFF"},
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{"category": "HARM_CATEGORY_CIVIC_INTEGRITY", "threshold": "OFF"},
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]
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return [
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{"category": "HARM_CATEGORY_HARASSMENT", "threshold": "BLOCK_NONE"},
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{"category": "HARM_CATEGORY_HATE_SPEECH", "threshold": "BLOCK_NONE"},
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{"category": "HARM_CATEGORY_SEXUALLY_EXPLICIT", "threshold": "BLOCK_NONE"},
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{"category": "HARM_CATEGORY_DANGEROUS_CONTENT", "threshold": "BLOCK_NONE"},
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{"category": "HARM_CATEGORY_CIVIC_INTEGRITY", "threshold": "BLOCK_NONE"},
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]
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def _build_payload(
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request: ChatRequest,
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messages: List[Dict[str, Any]],
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instruction: Optional[Dict[str, Any]] = None,
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) -> Dict[str, Any]:
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"""构建请求payload"""
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payload = {
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"contents": messages,
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"generationConfig": {
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"temperature": request.temperature,
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"maxOutputTokens": request.max_tokens,
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"stopSequences": request.stop,
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"topP": request.top_p,
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"topK": request.top_k,
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},
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"tools": _build_tools(request, messages),
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"safetySettings": _get_safety_settings(request.model),
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}
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if request.model.endswith("-image") or request.model.endswith("-image-generation"):
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payload["generationConfig"]["responseModalities"] = ["Text", "Image"]
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if (
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instruction
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and isinstance(instruction, dict)
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and instruction.get("role") == "system"
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and instruction.get("parts")
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and not request.model.endswith("-image")
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and not request.model.endswith("-image-generation")
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):
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payload["systemInstruction"] = instruction
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return payload
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class OpenAIChatService:
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"""聊天服务"""
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def __init__(self, base_url: str, key_manager: KeyManager = None):
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self.message_converter = OpenAIMessageConverter()
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self.response_handler = OpenAIResponseHandler(config=None)
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self.api_client = GeminiApiClient(base_url)
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self.key_manager = key_manager
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self.image_create_service = ImageCreateService()
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def _extract_text_from_openai_chunk(self, chunk: Dict[str, Any]) -> str:
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"""从OpenAI响应块中提取文本内容"""
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if not chunk.get("choices"):
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return ""
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choice = chunk["choices"][0]
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if "delta" in choice and "content" in choice["delta"]:
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return choice["delta"]["content"]
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return ""
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def _create_char_openai_chunk(
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self, original_chunk: Dict[str, Any], text: str
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) -> Dict[str, Any]:
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"""创建包含指定文本的OpenAI响应块"""
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chunk_copy = json.loads(json.dumps(original_chunk)) # 深拷贝
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if chunk_copy.get("choices") and "delta" in chunk_copy["choices"][0]:
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chunk_copy["choices"][0]["delta"]["content"] = text
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return chunk_copy
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async def create_chat_completion(
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self,
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request: ChatRequest,
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api_key: str,
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) -> Union[Dict[str, Any], AsyncGenerator[str, None]]:
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"""创建聊天完成"""
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# 转换消息格式
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messages, instruction = self.message_converter.convert(request.messages)
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# 构建请求payload
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payload = _build_payload(request, messages, instruction)
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if request.stream:
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return self._handle_stream_completion(request.model, payload, api_key)
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return await self._handle_normal_completion(request.model, payload, api_key)
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async def _handle_normal_completion(
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self, model: str, payload: Dict[str, Any], api_key: str
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) -> Dict[str, Any]:
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"""处理普通聊天完成"""
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response = await self.api_client.generate_content(payload, model, api_key)
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return self.response_handler.handle_response(
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response, model, stream=False, finish_reason="stop"
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)
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async def _handle_stream_completion(
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self, model: str, payload: Dict[str, Any], api_key: str
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) -> AsyncGenerator[str, None]:
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"""处理流式聊天完成，添加重试逻辑"""
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retries = 0
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max_retries = 3
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while retries < max_retries:
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try:
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async for line in self.api_client.stream_generate_content(
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payload, model, api_key
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):
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# print(line)
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if line.startswith("data:"):
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chunk = json.loads(line[6:])
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openai_chunk = self.response_handler.handle_response(
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chunk, model, stream=True, finish_reason=None
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)
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if openai_chunk:
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# 提取文本内容
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text = self._extract_text_from_openai_chunk(openai_chunk)
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if text:
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# 使用流式输出优化器处理文本输出
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async for (
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optimized_chunk
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) in openai_optimizer.optimize_stream_output(
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text,
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lambda t: self._create_char_openai_chunk(
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openai_chunk, t
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),
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lambda c: f"data: {json.dumps(c)}\n\n",
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):
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yield optimized_chunk
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else:
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# 如果没有文本内容（如工具调用等），整块输出
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yield f"data: {json.dumps(openai_chunk)}\n\n"
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yield f"data: {json.dumps(self.response_handler.handle_response({}, model, stream=True, finish_reason='stop'))}\n\n"
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yield "data: [DONE]\n\n"
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logger.info("Streaming completed successfully")
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break # 成功后退出循环
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except Exception as e:
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retries += 1
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logger.warning(
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f"Streaming API call failed with error: {str(e)}. Attempt {retries} of {max_retries}"
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)
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api_key = await self.key_manager.handle_api_failure(api_key)
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logger.info(f"Switched to new API key: {api_key}")
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if retries >= max_retries:
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logger.error(
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f"Max retries ({max_retries}) reached for streaming. Raising error"
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)
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yield f"data: {json.dumps({'error': 'Streaming failed after retries'})}\n\n"
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yield "data: [DONE]\n\n"
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break
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async def create_image_chat_completion(
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self,
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request: ChatRequest,
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) -> Union[Dict[str, Any], AsyncGenerator[str, None]]:
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image_generate_request = ImageGenerationRequest()
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image_generate_request.prompt = request.messages[-1]["content"]
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image_res = self.image_create_service.generate_images_chat(
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image_generate_request
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)
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if request.stream:
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return self._handle_stream_image_completion(request.model, image_res)
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else:
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return self._handle_normal_image_completion(request.model, image_res)
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async def _handle_stream_image_completion(
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self, model: str, image_data: str
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) -> AsyncGenerator[str, None]:
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if image_data:
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openai_chunk = self.response_handler.handle_image_chat_response(
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image_data, model, stream=True, finish_reason=None
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)
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if openai_chunk:
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# 提取文本内容
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text = self._extract_text_from_openai_chunk(openai_chunk)
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if text:
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# 使用流式输出优化器处理文本输出
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async for (
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optimized_chunk
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) in openai_optimizer.optimize_stream_output(
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text,
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lambda t: self._create_char_openai_chunk(openai_chunk, t),
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lambda c: f"data: {json.dumps(c)}\n\n",
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):
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yield optimized_chunk
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else:
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# 如果没有文本内容（如图片URL等），整块输出
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yield f"data: {json.dumps(openai_chunk)}\n\n"
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yield f"data: {json.dumps(self.response_handler.handle_response({}, model, stream=True, finish_reason='stop'))}\n\n"
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yield "data: [DONE]\n\n"
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logger.info("Image chat streaming completed successfully")
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def _handle_normal_image_completion(
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self, model: str, image_data: str
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) -> Dict[str, Any]:
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return self.response_handler.handle_image_chat_response(
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image_data, model, stream=False, finish_reason="stop"
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)
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