gpt4free/g4f/api/__init__.py
2024-04-20 15:41:49 +02:00

159 lines
5.9 KiB
Python

import logging
import json
import uvicorn
from fastapi import FastAPI, Response, Request
from fastapi.responses import StreamingResponse, RedirectResponse, HTMLResponse, JSONResponse
from fastapi.exceptions import RequestValidationError
from starlette.status import HTTP_422_UNPROCESSABLE_ENTITY
from fastapi.encoders import jsonable_encoder
from pydantic import BaseModel
from typing import List, Union, Optional
import g4f
import g4f.debug
from g4f.client import AsyncClient
from g4f.typing import Messages
app = FastAPI()
class ChatCompletionsConfig(BaseModel):
messages: Messages
model: str
provider: Optional[str] = None
stream: bool = False
temperature: Optional[float] = None
max_tokens: Optional[int] = None
stop: Union[list[str], str, None] = None
api_key: Optional[str] = None
web_search: Optional[bool] = None
proxy: Optional[str] = None
class Api:
def __init__(self, list_ignored_providers: List[str] = None) -> None:
self.list_ignored_providers = list_ignored_providers
self.client = AsyncClient()
def set_list_ignored_providers(self, list: list):
self.list_ignored_providers = list
def register_validation_exception_handler(self):
@app.exception_handler(RequestValidationError)
async def validation_exception_handler(request: Request, exc: RequestValidationError):
details = exc.errors()
modified_details = []
for error in details:
modified_details.append({
"loc": error["loc"],
"message": error["msg"],
"type": error["type"],
})
return JSONResponse(
status_code=HTTP_422_UNPROCESSABLE_ENTITY,
content=jsonable_encoder({"detail": modified_details}),
)
def register_routes(self):
@app.get("/")
async def read_root():
return RedirectResponse("/v1", 302)
@app.get("/v1")
async def read_root_v1():
return HTMLResponse('g4f API: Go to '
'<a href="/v1/chat/completions">chat/completions</a> '
'or <a href="/v1/models">models</a>.')
@app.get("/v1/models")
async def models():
model_list = dict(
(model, g4f.models.ModelUtils.convert[model])
for model in g4f.Model.__all__()
)
model_list = [{
'id': model_id,
'object': 'model',
'created': 0,
'owned_by': model.base_provider
} for model_id, model in model_list.items()]
return JSONResponse(model_list)
@app.get("/v1/models/{model_name}")
async def model_info(model_name: str):
try:
model_info = g4f.models.ModelUtils.convert[model_name]
return JSONResponse({
'id': model_name,
'object': 'model',
'created': 0,
'owned_by': model_info.base_provider
})
except:
return JSONResponse({"error": "The model does not exist."})
@app.post("/v1/chat/completions")
async def chat_completions(config: ChatCompletionsConfig = None, request: Request = None, provider: str = None):
try:
config.provider = provider if config.provider is None else config.provider
if config.api_key is None and request is not None:
auth_header = request.headers.get("Authorization")
if auth_header is not None:
auth_header = auth_header.split(None, 1)[-1]
if auth_header and auth_header != "Bearer":
config.api_key = auth_header
response = self.client.chat.completions.create(
**config.dict(exclude_none=True),
ignored=self.list_ignored_providers
)
except Exception as e:
logging.exception(e)
return Response(content=format_exception(e, config), status_code=500, media_type="application/json")
if not config.stream:
return JSONResponse((await response).to_json())
async def streaming():
try:
async for chunk in response:
yield f"data: {json.dumps(chunk.to_json())}\n\n"
except GeneratorExit:
pass
except Exception as e:
logging.exception(e)
yield f'data: {format_exception(e, config)}\n\n'
yield "data: [DONE]\n\n"
return StreamingResponse(streaming(), media_type="text/event-stream")
@app.post("/v1/completions")
async def completions():
return Response(content=json.dumps({'info': 'Not working yet.'}, indent=4), media_type="application/json")
api = Api()
api.register_routes()
api.register_validation_exception_handler()
def format_exception(e: Exception, config: ChatCompletionsConfig) -> str:
last_provider = g4f.get_last_provider(True)
return json.dumps({
"error": {"message": f"{e.__class__.__name__}: {e}"},
"model": last_provider.get("model") if last_provider else config.model,
"provider": last_provider.get("name") if last_provider else config.provider
})
def run_api(
host: str = '0.0.0.0',
port: int = 1337,
bind: str = None,
debug: bool = False,
workers: int = None,
use_colors: bool = None
) -> None:
print(f'Starting server... [g4f v-{g4f.version.utils.current_version}]' + (" (debug)" if debug else ""))
if use_colors is None:
use_colors = debug
if bind is not None:
host, port = bind.split(":")
if debug:
g4f.debug.logging = True
uvicorn.run("g4f.api:app", host=host, port=int(port), workers=workers, use_colors=use_colors)#