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from typing import Dict, List, Optional
import asyncio
import os
import httpx
from fastchat.protocol.chat_completion import (
ChatCompletionRequest,
ChatCompletionResponse,
)
_BASE_URL = "http://localhost:8000"
if os.environ.get("FASTCHAT_BASE_URL"):
_BASE_URL = os.environ.get("FASTCHAT_BASE_URL")
def set_baseurl(base_url: str):
global _BASE_URL
_BASE_URL = base_url
class ChatCompletionClient:
def __init__(self, base_url: str):
self.base_url = base_url
async def request_completion(
self, request: ChatCompletionRequest, timeout: Optional[float] = None
) -> ChatCompletionResponse:
async with httpx.AsyncClient() as client:
response = await client.post(
f"{self.base_url}/v1/chat/completions",
json=request.dict(),
timeout=timeout,
)
response.raise_for_status()
return ChatCompletionResponse.parse_obj(response.json())
class ChatCompletion:
OBJECT_NAME = "chat.completions"
@classmethod
def create(cls, *args, **kwargs) -> ChatCompletionResponse:
"""Creates a new chat completion for the provided messages and parameters.
See `acreate` for more details.
"""
return asyncio.run(cls.acreate(*args, **kwargs))
@classmethod
async def acreate(
cls,
model: str,
messages: List[Dict[str, str]],
temperature: Optional[float] = 0.7,
n: int = 1,
max_tokens: Optional[int] = None,
stop: Optional[str] = None,
timeout: Optional[float] = None,
) -> ChatCompletionResponse:
"""Creates a new chat completion for the provided messages and parameters."""
request = ChatCompletionRequest(
model=model,
messages=messages,
temperature=temperature,
n=n,
max_tokens=max_tokens,
stop=stop,
)
client = ChatCompletionClient(_BASE_URL)
response = await client.request_completion(request, timeout=timeout)
return response
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