mirror of
https://github.com/snailyp/gemini-balance.git
synced 2026-06-07 16:49:36 +08:00
a6cfc12443
- 修改了 response_handler.py 中的 _handle_openai_stream_response 和 _handle_openai_normal_response 方法，增加了对推理内容 (reasoning_content) 的支持。 - 更新了 _extract_result 方法的返回值，确保能够提取推理内容。 - 在 gemini_chat_service.py 和 openai_chat_service.py 中，调整了生成配置以包含思考过程的选项。 - 在 vertex_express_chat_service.py 中，增强了对客户端思考配置的处理逻辑，确保优先使用客户端提供的配置。
640 lines
25 KiB
Python
640 lines
25 KiB
Python
# app/services/chat_service.py
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import asyncio
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import datetime
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import json
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import re
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import time
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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.core.constants import GEMINI_2_FLASH_EXP_SAFETY_SETTINGS
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from app.database.services import (
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add_error_log,
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add_request_log,
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)
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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_media_parts(messages: List[Dict[str, Any]]) -> bool:
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"""判断消息是否包含多媒体部分"""
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for message in messages:
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if "parts" in message:
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for part in message["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 _clean_json_schema_properties(obj: Any) -> Any:
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"""清理JSON Schema中Gemini API不支持的字段"""
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if not isinstance(obj, dict):
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return obj
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# Gemini API不支持的JSON Schema字段
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unsupported_fields = {
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"exclusiveMaximum", "exclusiveMinimum", "const", "examples",
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"contentEncoding", "contentMediaType", "if", "then", "else",
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"allOf", "anyOf", "oneOf", "not", "definitions", "$schema",
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"$id", "$ref", "$comment", "readOnly", "writeOnly"
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}
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cleaned = {}
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for key, value in obj.items():
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if key in unsupported_fields:
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continue
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if isinstance(value, dict):
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cleaned[key] = _clean_json_schema_properties(value)
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elif isinstance(value, list):
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cleaned[key] = [_clean_json_schema_properties(item) for item in value]
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else:
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cleaned[key] = value
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return cleaned
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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_media_parts(messages)
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):
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tool["codeExecution"] = {}
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logger.debug("Code execution tool enabled.")
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elif _has_media_parts(messages):
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logger.debug("Code execution tool disabled due to media parts presence.")
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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(
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"properties", {}
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):
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function.pop("parameters", None)
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# 清理函数中的不支持字段
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function = _clean_json_schema_properties(function)
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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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if fc.get("name")=="googleSearch":
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# cherry开启内置搜索时，添加googleSearch工具
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tool["googleSearch"] = {}
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else:
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# 其他函数，添加到functionDeclarations中
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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] if tool else []
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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 GEMINI_2_FLASH_EXP_SAFETY_SETTINGS
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return settings.SAFETY_SETTINGS
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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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"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.max_tokens is not None:
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payload["generationConfig"]["maxOutputTokens"] = request.max_tokens
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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 request.model.endswith("-non-thinking"):
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payload["generationConfig"]["thinkingConfig"] = {"thinkingBudget": 0}
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if request.model in settings.THINKING_BUDGET_MAP:
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if settings.SHOW_THINKING_PROCESS:
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payload["generationConfig"]["thinkingConfig"] = {
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"thinkingBudget": settings.THINKING_BUDGET_MAP.get(request.model, 1000),
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"includeThoughts": True
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}
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else:
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payload["generationConfig"]["thinkingConfig"] = {"thinkingBudget": settings.THINKING_BUDGET_MAP.get(request.model, 1000)}
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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, settings.TIME_OUT)
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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))
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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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messages, instruction = self.message_converter.convert(request.messages)
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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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start_time = time.perf_counter()
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request_datetime = datetime.datetime.now()
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is_success = False
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status_code = None
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response = None
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try:
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response = await self.api_client.generate_content(payload, model, api_key)
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usage_metadata = response.get("usageMetadata", {})
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is_success = True
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status_code = 200
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return self.response_handler.handle_response(
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response,
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model,
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stream=False,
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finish_reason="stop",
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usage_metadata=usage_metadata,
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)
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except Exception as e:
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is_success = False
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error_log_msg = str(e)
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logger.error(f"Normal API call failed with error: {error_log_msg}")
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match = re.search(r"status code (\d+)", error_log_msg)
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if match:
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status_code = int(match.group(1))
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else:
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status_code = 500
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await add_error_log(
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gemini_key=api_key,
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model_name=model,
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error_type="openai-chat-non-stream",
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error_log=error_log_msg,
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error_code=status_code,
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request_msg=payload,
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)
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raise e
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finally:
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end_time = time.perf_counter()
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latency_ms = int((end_time - start_time) * 1000)
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await add_request_log(
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model_name=model,
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api_key=api_key,
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is_success=is_success,
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status_code=status_code,
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latency_ms=latency_ms,
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request_time=request_datetime,
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)
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async def _fake_stream_logic_impl(
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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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"""处理伪流式 (fake stream) 的核心逻辑"""
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logger.info(
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f"Fake streaming enabled for model: {model}. Calling non-streaming endpoint."
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)
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keep_sending_empty_data = True
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async def send_empty_data_locally() -> AsyncGenerator[str, None]:
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"""定期发送空数据以保持连接"""
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while keep_sending_empty_data:
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await asyncio.sleep(settings.FAKE_STREAM_EMPTY_DATA_INTERVAL_SECONDS)
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if keep_sending_empty_data:
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empty_chunk = self.response_handler.handle_response({}, model, stream=True, finish_reason='stop', usage_metadata=None)
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yield f"data: {json.dumps(empty_chunk)}\n\n"
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logger.debug("Sent empty data chunk for fake stream heartbeat.")
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empty_data_generator = send_empty_data_locally()
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api_response_task = asyncio.create_task(
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self.api_client.generate_content(payload, model, api_key)
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)
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try:
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while not api_response_task.done():
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try:
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next_empty_chunk = await asyncio.wait_for(
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empty_data_generator.__anext__(), timeout=0.1
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)
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yield next_empty_chunk
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except asyncio.TimeoutError:
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pass
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except (
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StopAsyncIteration
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):
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break
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response = await api_response_task
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finally:
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keep_sending_empty_data = False
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if response and response.get("candidates"):
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response = self.response_handler.handle_response(response, model, stream=True, finish_reason='stop', usage_metadata=response.get("usageMetadata", {}))
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yield f"data: {json.dumps(response)}\n\n"
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logger.info(f"Sent full response content for fake stream: {model}")
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else:
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error_message = "Failed to get response from model"
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if (
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response and isinstance(response, dict) and response.get("error")
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):
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error_details = response.get("error")
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if isinstance(error_details, dict):
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error_message = error_details.get("message", error_message)
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logger.error(
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f"No candidates or error in response for fake stream model {model}: {response}"
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)
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error_chunk = self.response_handler.handle_response({}, model, stream=True, finish_reason='stop', usage_metadata=None)
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yield f"data: {json.dumps(error_chunk)}\n\n"
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async def _real_stream_logic_impl(
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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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"""处理真实流式 (real stream) 的核心逻辑"""
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tool_call_flag = False
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usage_metadata = None
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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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if line.startswith("data:"):
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chunk_str = line[6:]
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if not chunk_str or chunk_str.isspace():
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logger.debug(
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f"Received empty data line for model {model}, skipping."
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)
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continue
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try:
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chunk = json.loads(chunk_str)
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usage_metadata = chunk.get("usageMetadata", {})
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except json.JSONDecodeError:
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logger.error(
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f"Failed to decode JSON from stream for model {model}: {chunk_str}"
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)
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continue
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openai_chunk = self.response_handler.handle_response(
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chunk, model, stream=True, finish_reason=None, usage_metadata=usage_metadata
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)
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if openai_chunk:
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text = self._extract_text_from_openai_chunk(openai_chunk)
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if text and settings.STREAM_OPTIMIZER_ENABLED:
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async for (
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optimized_chunk_data
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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_data
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else:
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if openai_chunk.get("choices") and openai_chunk["choices"][0].get("delta", {}).get("tool_calls"):
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tool_call_flag = True
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yield f"data: {json.dumps(openai_chunk)}\n\n"
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if tool_call_flag:
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yield f"data: {json.dumps(self.response_handler.handle_response({}, model, stream=True, finish_reason='tool_calls', usage_metadata=usage_metadata))}\n\n"
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else:
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yield f"data: {json.dumps(self.response_handler.handle_response({}, model, stream=True, finish_reason='stop', usage_metadata=usage_metadata))}\n\n"
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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，添加重试逻辑和假流式支持"""
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retries = 0
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max_retries = settings.MAX_RETRIES
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is_success = False
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status_code = None
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final_api_key = api_key
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while retries < max_retries:
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start_time = time.perf_counter()
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request_datetime = datetime.datetime.now()
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current_attempt_key = final_api_key
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try:
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stream_generator = None
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if settings.FAKE_STREAM_ENABLED:
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logger.info(
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f"Using fake stream logic for model: {model}, Attempt: {retries + 1}"
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)
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stream_generator = self._fake_stream_logic_impl(
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model, payload, current_attempt_key
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)
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else:
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logger.info(
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f"Using real stream logic for model: {model}, Attempt: {retries + 1}"
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)
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stream_generator = self._real_stream_logic_impl(
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model, payload, current_attempt_key
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)
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async for chunk_data in stream_generator:
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yield chunk_data
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yield "data: [DONE]\n\n"
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logger.info(
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f"Streaming completed successfully for model: {model}, FakeStream: {settings.FAKE_STREAM_ENABLED}, Attempt: {retries + 1}"
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)
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is_success = True
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status_code = 200
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break
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except Exception as e:
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retries += 1
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is_success = False
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error_log_msg = str(e)
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logger.warning(
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f"Streaming API call failed with error: {error_log_msg}. Attempt {retries} of {max_retries} with key {current_attempt_key}"
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)
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match = re.search(r"status code (\\d+)", error_log_msg)
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if match:
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status_code = int(match.group(1))
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else:
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if isinstance(e, asyncio.TimeoutError):
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status_code = 408
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else:
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status_code = 500
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await add_error_log(
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gemini_key=current_attempt_key,
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model_name=model,
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error_type="openai-chat-stream",
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error_log=error_log_msg,
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error_code=status_code,
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request_msg=payload,
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)
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if self.key_manager:
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new_api_key = await self.key_manager.handle_api_failure(
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current_attempt_key, retries
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)
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if new_api_key and new_api_key != current_attempt_key:
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final_api_key = new_api_key
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logger.info(
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f"Switched to new API key for next attempt: {final_api_key}"
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)
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elif not new_api_key:
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logger.error(
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f"No valid API key available after {retries} retries, ceasing attempts for this request."
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)
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break
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else:
|
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logger.error(
|
||
"KeyManager not available, cannot switch API key. Ceasing attempts for this request."
|
||
)
|
||
break
|
||
|
||
if retries >= max_retries:
|
||
logger.error(
|
||
f"Max retries ({max_retries}) reached for streaming model {model}."
|
||
)
|
||
finally:
|
||
end_time = time.perf_counter()
|
||
latency_ms = int((end_time - start_time) * 1000)
|
||
await add_request_log(
|
||
model_name=model,
|
||
api_key=current_attempt_key,
|
||
is_success=is_success,
|
||
status_code=status_code,
|
||
latency_ms=latency_ms,
|
||
request_time=request_datetime,
|
||
)
|
||
|
||
if not is_success:
|
||
logger.error(
|
||
f"Streaming failed permanently for model {model} after {retries} attempts."
|
||
)
|
||
yield f"data: {json.dumps({'error': f'Streaming failed after {retries} retries.'})}\n\n"
|
||
yield "data: [DONE]\n\n"
|
||
|
||
async def create_image_chat_completion(
|
||
self, request: ChatRequest, api_key: str
|
||
) -> Union[Dict[str, Any], AsyncGenerator[str, None]]:
|
||
|
||
image_generate_request = ImageGenerationRequest()
|
||
image_generate_request.prompt = request.messages[-1]["content"]
|
||
image_res = self.image_create_service.generate_images_chat(
|
||
image_generate_request
|
||
)
|
||
|
||
if request.stream:
|
||
return self._handle_stream_image_completion(
|
||
request.model, image_res, api_key
|
||
)
|
||
else:
|
||
return await self._handle_normal_image_completion(
|
||
request.model, image_res, api_key
|
||
)
|
||
|
||
async def _handle_stream_image_completion(
|
||
self, model: str, image_data: str, api_key: str
|
||
) -> AsyncGenerator[str, None]:
|
||
logger.info(f"Starting stream image completion for model: {model}")
|
||
start_time = time.perf_counter()
|
||
request_datetime = datetime.datetime.now()
|
||
is_success = False
|
||
status_code = None
|
||
|
||
try:
|
||
if image_data:
|
||
openai_chunk = self.response_handler.handle_image_chat_response(
|
||
image_data, model, stream=True, finish_reason=None
|
||
)
|
||
if openai_chunk:
|
||
# 提取文本内容
|
||
text = self._extract_text_from_openai_chunk(openai_chunk)
|
||
if text:
|
||
# 使用流式输出优化器处理文本输出
|
||
async for (
|
||
optimized_chunk
|
||
) in openai_optimizer.optimize_stream_output(
|
||
text,
|
||
lambda t: self._create_char_openai_chunk(openai_chunk, t),
|
||
lambda c: f"data: {json.dumps(c)}\n\n",
|
||
):
|
||
yield optimized_chunk
|
||
else:
|
||
# 如果没有文本内容（如图片URL等），整块输出
|
||
yield f"data: {json.dumps(openai_chunk)}\n\n"
|
||
yield f"data: {json.dumps(self.response_handler.handle_response({}, model, stream=True, finish_reason='stop'))}\n\n"
|
||
logger.info(
|
||
f"Stream image completion finished successfully for model: {model}"
|
||
)
|
||
is_success = True
|
||
status_code = 200
|
||
yield "data: [DONE]\n\n"
|
||
except Exception as e:
|
||
is_success = False
|
||
error_log_msg = f"Stream image completion failed for model {model}: {e}"
|
||
logger.error(error_log_msg)
|
||
status_code = 500
|
||
await add_error_log(
|
||
gemini_key=api_key,
|
||
model_name=model,
|
||
error_type="openai-image-stream",
|
||
error_log=error_log_msg,
|
||
error_code=status_code,
|
||
request_msg={"image_data_truncated": image_data[:1000]},
|
||
)
|
||
yield f"data: {json.dumps({'error': error_log_msg})}\n\n"
|
||
yield "data: [DONE]\n\n"
|
||
finally:
|
||
end_time = time.perf_counter()
|
||
latency_ms = int((end_time - start_time) * 1000)
|
||
logger.info(
|
||
f"Stream image completion for model {model} took {latency_ms} ms. Success: {is_success}"
|
||
)
|
||
await add_request_log(
|
||
model_name=model,
|
||
api_key=api_key,
|
||
is_success=is_success,
|
||
status_code=status_code,
|
||
latency_ms=latency_ms,
|
||
request_time=request_datetime,
|
||
)
|
||
|
||
async def _handle_normal_image_completion(
|
||
self, model: str, image_data: str, api_key: str
|
||
) -> Dict[str, Any]:
|
||
logger.info(f"Starting normal image completion for model: {model}")
|
||
start_time = time.perf_counter()
|
||
request_datetime = datetime.datetime.now()
|
||
is_success = False
|
||
status_code = None
|
||
result = None
|
||
|
||
try:
|
||
result = self.response_handler.handle_image_chat_response(
|
||
image_data, model, stream=False, finish_reason="stop"
|
||
)
|
||
logger.info(
|
||
f"Normal image completion finished successfully for model: {model}"
|
||
)
|
||
is_success = True
|
||
status_code = 200
|
||
return result
|
||
except Exception as e:
|
||
is_success = False
|
||
error_log_msg = f"Normal image completion failed for model {model}: {e}"
|
||
logger.error(error_log_msg)
|
||
status_code = 500
|
||
await add_error_log(
|
||
gemini_key=api_key,
|
||
model_name=model,
|
||
error_type="openai-image-non-stream",
|
||
error_log=error_log_msg,
|
||
error_code=status_code,
|
||
request_msg={"image_data_truncated": image_data[:1000]},
|
||
)
|
||
raise e
|
||
finally:
|
||
end_time = time.perf_counter()
|
||
latency_ms = int((end_time - start_time) * 1000)
|
||
logger.info(
|
||
f"Normal image completion for model {model} took {latency_ms} ms. Success: {is_success}"
|
||
)
|
||
await add_request_log(
|
||
model_name=model,
|
||
api_key=api_key,
|
||
is_success=is_success,
|
||
status_code=status_code,
|
||
latency_ms=latency_ms,
|
||
request_time=request_datetime,
|
||
)
|