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from __future__ import annotations
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 Union, Optional
import g4f
import g4f.debug
from g4f.client import AsyncClient
from g4f.typing import Messages
def create_app() -> FastAPI:
app = FastAPI()
api = Api(app)
api.register_routes()
api.register_validation_exception_handler()
return app
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
list_ignored_providers: list[str] = None
def set_list_ignored_providers(ignored: list[str]):
global list_ignored_providers
list_ignored_providers = ignored
class Api:
def __init__(self, app: FastAPI) -> None:
self.app = app
self.client = AsyncClient()
def register_validation_exception_handler(self):
@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):
@self.app.get("/")
async def read_root():
return RedirectResponse("/v1", 302)
@self.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>.')
@self.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)
@self.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."})
@self.app.post("/v1/chat/completions")
async def chat_completions(config: ChatCompletionsConfig, 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=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")
@self.app.post("/v1/completions")
async def completions():
return Response(content=json.dumps({'info': 'Not working yet.'}, indent=4), media_type="application/json")
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:create_app", host=host, port=int(port), workers=workers, use_colors=use_colors, factory=True)#
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