mirror of
https://github.com/kvcache-ai/ktransformers.git
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437 lines
21 KiB
Python
437 lines
21 KiB
Python
import json
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from time import time
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from uuid import uuid4
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from typing import Dict, List, Optional, Any, Literal, Union
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from pydantic import BaseModel, Field
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import re
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from fastapi import APIRouter
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from fastapi.requests import Request
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from ktransformers.server.utils.create_interface import get_interface
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from ktransformers.server.schemas.assistants.streaming import chat_stream_response
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from ktransformers.server.schemas.endpoints.chat import ChatCompletionCreate
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from ktransformers.server.schemas.endpoints.chat import RawUsage, Role
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from ktransformers.server.backend.base import BackendInterfaceBase
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from ktransformers.server.config.config import Config
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from ktransformers.server.config.log import logger
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from ktransformers.server.schemas.endpoints.chat import ChatCompletionChunk
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# Define own data structure instead of importing from OpenAI
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class CompletionUsage(BaseModel):
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prompt_tokens: int
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completion_tokens: int
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total_tokens: int
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prompt_tokens_details: Optional[Dict[str, Any]] = None
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completion_tokens_details: Optional[Dict[str, Any]] = None
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class Choice(BaseModel):
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index: int
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message: Optional[Dict[str, Any]] = None
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finish_reason: Optional[str] = None
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logprobs: Optional[Any] = None
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delta: Optional[Dict[str, Any]] = None
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content_filter_results: Optional[Dict[str, Any]] = None
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class ChatCompletion(BaseModel):
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id: str
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object: str = "chat.completion"
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created: int
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model: str
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choices: List[Choice]
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usage: Optional[CompletionUsage] = None
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system_fingerprint: Optional[str] = None
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prompt_filter_results: Optional[List[Dict[str, Any]]] = None
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# Only for non-streaming response construction
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class ChatCompletionMessageToolCallFunction(BaseModel):
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name: str
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arguments: str
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class ChatCompletionMessageToolCall(BaseModel):
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id: str
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type: str
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function: ChatCompletionMessageToolCallFunction
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class ChatCompletionMessage(BaseModel):
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role: str
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content: Optional[str] = None
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tool_calls: Optional[List[ChatCompletionMessageToolCall]] = None
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router = APIRouter()
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@router.get('/models', tags=['openai'])
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async def list_models():
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return {"data": [{"id": Config().model_name, "name": Config().model_name}], "object": "list"}
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def getTools(buffer):
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tool_calls_begin_marker = "<｜tool▁calls▁begin｜>"
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tool_call_begin_marker = "<｜tool▁call▁begin｜>"
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tool_sep_marker = "<｜tool▁sep｜>"
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tool_call_end_marker = "<｜tool▁call▁end｜>"
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tool_calls_end_marker = "<｜tool▁calls▁end｜>"
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extracted_tools = []
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working_buffer = buffer
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# Iterate over all function calls
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while tool_call_begin_marker in working_buffer and tool_call_end_marker in working_buffer:
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# Find a complete function call
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start_index = working_buffer.find(tool_call_begin_marker)
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end_index = working_buffer.find(tool_call_end_marker) + len(tool_call_end_marker)
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if start_index == -1 or end_index == -1 or start_index > end_index:
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logger.warning("Not a function")
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break
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# Extract the full function call
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full_tool_call = working_buffer[start_index:end_index]
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# Remove this function call from the working buffer to prevent duplicate processing
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working_buffer = working_buffer.replace(full_tool_call, "", 1)
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# Extract the function name
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function_name_start = full_tool_call.find(tool_sep_marker) + len(tool_sep_marker)
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function_name_end = full_tool_call.find("\n", function_name_start)
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function_name = full_tool_call[function_name_start:function_name_end].strip()
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# Extract JSON parameters
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json_pattern = r'```json\s*(.*?)\s*```'
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json_match = re.search(json_pattern, full_tool_call, re.DOTALL)
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if json_match:
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arguments_str = json_match.group(1).strip()
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# Generate tool call IDs
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tool_call_id = f"call_{uuid4().hex[:24]}"
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# Add to tool call list
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extracted_tools.append({
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"id": tool_call_id,
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"type": "function",
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"function": {
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"name": function_name,
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"arguments": arguments_str
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}
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})
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logger.info(f"Get Function: {function_name}")
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else:
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logger.warning(f"Unable to get function，function_name: {function_name}")
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logger.info(f"Total {len(extracted_tools)} Functions")
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return extracted_tools
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@router.post('/chat/completions', tags=['openai'])
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async def chat_completion(request: Request, create: ChatCompletionCreate):
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id = str(uuid4().hex)
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# 1. Use system prompts to let models know how to use tools
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enhanced_messages = list(create.messages)
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# If there is a tool and the first message is system, add instructions on how to use the tool in the system tip
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if create.tools and len(create.tools) > 0 and (enhanced_messages[0].role == Role.system or enhanced_messages[0].role == Role.user):
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tool_instructions = "你可以使用function_call，函数调用功能，目前，你可以使用以下工具\n\n"
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for tool in create.tools:
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tool_instructions += f" \"function\":{{\"name\" : {tool.function.name},\"description\" : {tool.function.description} , \"parameters\" : {tool.function.parameters}}}\n"
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# Modify tool usage guidelines to encourage JSON output
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tool_instructions += "name为函数名称，description为函数功能的描述，parameters中含有函数需要使用的参数和参数的描述, 其中required为必要参数\n"
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tool_instructions += "工具仅在用户明确提出，或者你认为需要调用工具的时候调用，注意，当需要高度实时性的信息比如时间或者最近的事情等，优先调用工具来获取！。当确实调用工具的关键信息时，你可以先向用户索取关键信息再调用工具\n"
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tool_instructions += "\n当你需要使用工具时，请以下列格式输出，格式为：\n"
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tool_instructions += '<｜tool▁calls▁begin｜><｜tool▁call▁begin｜>function<｜tool▁sep｜>name\n```json {"参数名": "参数值","参数名2": "参数值2"...}\n```<｜tool▁call▁end｜><｜tool▁calls▁end｜>\n'
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tool_instructions += '示例: \n<｜tool▁calls▁begin｜><｜tool▁call▁begin｜>function<｜tool▁sep｜>the_functnion_name_will_be_called\n```json {"arg1": "value1","arg2": "value2"}\n```<｜tool▁call▁end｜><｜tool▁calls▁end｜>\n'
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tool_instructions += "这样可以调用名为\"the_functnion_name_will_be_called\",并将value1和value2传入参数arg1,arg2\n"
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tool_instructions += "不要尝试解释你在做什么，直接输出工具函数调用即可。确保函数调用语句格式正确且完整。"
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enhanced_messages[0].content = enhanced_messages[0].content + "\n\n" + tool_instructions
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# Requests processed
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interface: BackendInterfaceBase = get_interface()
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input_message = [json.loads(m.model_dump_json()) for m in enhanced_messages]
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if Config().api_key != '':
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assert request.headers.get('Authorization', '').split()[-1] == Config().api_key
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if create.stream:
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async def inner():
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chunk = ChatCompletionChunk(
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id=id,
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choices=[],
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object='chat.completion.chunk',
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created=int(time()),
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model=Config().model_name,
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system_fingerprint=f"fp_{uuid4().hex[:12]}",
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)
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# Collect the full output of the model, but specialize in processing tool calls
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full_content = ""
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buffer = "" # Used to temporarily store the current block of text
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tool_call_mode = False # Mark if a tool call is being processed
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tool_calls = [] # Store all detected tool calls
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# Customize model special tokens
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tool_calls_begin_marker = "<｜tool▁calls▁begin｜>"
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tool_call_begin_marker = "<｜tool▁call▁begin｜>"
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tool_sep_marker = "<｜tool▁sep｜>"
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tool_call_end_marker = "<｜tool▁call▁end｜>"
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tool_calls_end_marker = "<｜tool▁calls▁end｜>"
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async for res in interface.inference(input_message, id, create.temperature, create.top_p):
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if isinstance(res, RawUsage):
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# Final return on utilization
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raw_usage = res
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chunk.choices = []
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chunk.usage = CompletionUsage(
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prompt_tokens=raw_usage.prefill_count,
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completion_tokens=raw_usage.decode_count,
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total_tokens=raw_usage.prefill_count + raw_usage.decode_count
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)
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yield chunk
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elif isinstance(res, tuple) and len(res) == 2:
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token, finish_reason = res
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# Detecting model-specific formatting tool call starts
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if not tool_call_mode and tool_calls_begin_marker in buffer + token:
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tool_call_mode = True
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# Adjust full_content to remove tool call section
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if buffer.endswith(tool_calls_begin_marker):
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full_content = full_content[:-len(tool_calls_begin_marker)]
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elif tool_calls_begin_marker in (buffer + token):
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idx = (buffer + token).find(tool_calls_begin_marker)
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full_content = full_content[:-(len(buffer) - idx)]
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buffer = ""
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# Send the current cumulative text content (if any)
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if full_content:
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chunk.choices = [{
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"index": 0,
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"delta": {"content": full_content},
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"finish_reason": None
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}]
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yield chunk
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full_content = ""
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# Accumulation of content in non-tool call mode
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if not tool_call_mode:
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full_content += token
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buffer += token
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# Keep the buffer at a reasonable size
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if len(buffer) > 200:
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buffer = buffer[-200:]
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else:
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# In tool call mode, continue to collect tool call related text
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buffer += token
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# If the tool call end marker is found
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if tool_calls_end_marker in buffer:
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try:
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# Parsing Calling Text Extraction Tool Calling Information
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tool_calls = getTools(buffer)
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if len(tool_calls):
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# reset state
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tool_call_mode = False
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buffer = ""
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# Send tool call events
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for idx, tool_call in enumerate(tool_calls):
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# First tool call message
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chunk.choices = [{
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"index": 0,
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"delta": {
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"role": "assistant",
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"content": None,
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"tool_calls": [{
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"index": idx,
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"id": tool_call["id"],
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"type": "function",
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"function": {
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"name": tool_call["function"]["name"],
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"arguments": ""
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}
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}]
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},
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"finish_reason": None
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}]
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yield chunk
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# Sending Parameters
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chunk.choices = [{
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"index": 0,
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"delta": {
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"tool_calls": [{
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"index": idx,
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"function": {"arguments": tool_call["function"]["arguments"]}
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}]
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},
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"finish_reason": None
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}]
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yield chunk
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# Send Completion Message
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chunk.choices = [{
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"index": 0,
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"delta": {},
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"finish_reason": "tool_calls"
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}]
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yield chunk
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# No further processing after return
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return
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else:
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# JSON extraction failed, probably incomplete formatting
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logger.warning("Failed to extract JSON from tool call")
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tool_call_mode = False
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buffer = ""
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except Exception as e:
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logger.error(f"Error processing tool call: {e}")
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tool_call_mode = False
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buffer = ""
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# Normal text output (only in non-tool call mode)
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if not tool_call_mode and token:
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if finish_reason is not None:
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chunk.choices = [{
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"index": 0,
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"delta": {},
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"finish_reason": finish_reason
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}]
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yield chunk
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else:
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if any(marker in token for marker in [tool_calls_begin_marker, tool_call_begin_marker]):
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pass
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else:
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chunk.choices = [{
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"index": 0,
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"delta": {"content": token},
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"finish_reason": None
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}]
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yield chunk
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# If gotten this far without returning, it means that the full tool call was not detected
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# Send Routine Completion Message
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if not tool_call_mode:
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chunk.choices = [{
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"index": 0,
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"delta": {},
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"finish_reason": "stop"
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}]
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yield chunk
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return chat_stream_response(request, inner())
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else:
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# non streaming response processing
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full_content = ""
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finish_reason = None
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tool_calls = []
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buffer = ""
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tool_call_mode = False
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# Custom model special markers
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tool_calls_begin_marker = "<｜tool▁calls▁begin｜>"
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tool_call_begin_marker = "<｜tool▁call▁begin｜>"
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tool_sep_marker = "<｜tool▁sep｜>"
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tool_call_end_marker = "<｜tool▁call▁end｜>"
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tool_calls_end_marker = "<｜tool▁calls▁end｜>"
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async for res in interface.inference(input_message, id, create.temperature, create.top_p):
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if isinstance(res, RawUsage):
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raw_usage = res
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usage = CompletionUsage(
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prompt_tokens=raw_usage.prefill_count,
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completion_tokens=raw_usage.decode_count,
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total_tokens=raw_usage.prefill_count + raw_usage.decode_count
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)
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elif isinstance(res, tuple) and len(res) == 2:
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token, finish_reason = res
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# Detecting the start of model-specific formatting tool calls
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if not tool_call_mode and tool_calls_begin_marker in buffer + token:
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tool_call_mode = True
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# Adjust full_content to remove tool call section
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if buffer.endswith(tool_calls_begin_marker):
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full_content = full_content[:-len(tool_calls_begin_marker)]
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elif tool_calls_begin_marker in (buffer + token):
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idx = (buffer + token).find(tool_calls_begin_marker)
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full_content = full_content[:-(len(buffer) - idx)]
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buffer = ""
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# Accumulation of content in non-tool call mode
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if not tool_call_mode:
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full_content += token
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buffer += token
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# Keep the buffer at a reasonable size
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if len(buffer) > 200:
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buffer = buffer[-200:]
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else:
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# In tool call mode, continue to collect tool call related text
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buffer += token
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# If the tool call end marker is found
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if tool_calls_end_marker in buffer:
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try:
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# Parsing Calling Text Extraction Tool Calling Information
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full_tool_call = buffer
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# Extract function name
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function_name_start = full_tool_call.find(tool_sep_marker) + len(tool_sep_marker)
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function_name_end = full_tool_call.find("\n", function_name_start)
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function_name = full_tool_call[function_name_start:function_name_end].strip()
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# Extract JSON Parameters - Extracts the content between ```json and ```.
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json_pattern = r'```json\s*(.*?)\s*```'
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json_match = re.search(json_pattern, full_tool_call, re.DOTALL)
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if json_match:
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arguments_str = json_match.group(1).strip()
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# Generate tool call IDs
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tool_call_id = f"call_{uuid4().hex[:24]}"
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# Add to tool call list
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tool_calls.append({
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"id": tool_call_id,
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"index": 0,
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"type": "function",
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"function": {
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"name": function_name,
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"arguments": arguments_str
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}
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})
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# If the tool call is successfully parsed, set the reason for completion
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finish_reason = "tool_calls"
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# reset state
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tool_call_mode = False
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buffer = ""
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else:
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# JSON extraction failed, probably incomplete formatting
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logger.warning("Failed to extract JSON from tool call")
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tool_call_mode = False
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buffer = ""
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except Exception as e:
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logger.error(f"Error processing tool call: {e}")
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tool_call_mode = False
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buffer = ""
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# Build Response
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response = {
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"id": id,
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"object": "chat.completion",
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"created": int(time()),
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"model": Config().model_name,
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"choices": [{
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"index": 0,
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"message": {
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"role": "assistant",
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"content": None if tool_calls else full_content,
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"tool_calls": tool_calls if tool_calls else None
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},
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"finish_reason": finish_reason or "stop"
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}],
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"usage": usage.__dict__,
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"system_fingerprint": f"fp_{uuid4().hex[:12]}"
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}
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return response
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