405 lines
13 KiB
Python
405 lines
13 KiB
Python
from __future__ import annotations
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import os
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import json
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from threading import Lock
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from functools import partial
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from typing import Iterator, List, Optional, Union, Dict
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import llama_cpp
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import anyio
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from anyio.streams.memory import MemoryObjectSendStream
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from starlette.concurrency import run_in_threadpool, iterate_in_threadpool
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from fastapi import (
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Depends,
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FastAPI,
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APIRouter,
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Request,
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HTTPException,
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status,
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)
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from fastapi.middleware import Middleware
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from fastapi.middleware.cors import CORSMiddleware
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from fastapi.security import HTTPBearer
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from sse_starlette.sse import EventSourceResponse
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from starlette_context.plugins import RequestIdPlugin # type: ignore
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from starlette_context.middleware import RawContextMiddleware
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from llama_cpp.server.model import (
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LlamaProxy,
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)
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from llama_cpp.server.settings import (
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ConfigFileSettings,
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Settings,
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ModelSettings,
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ServerSettings,
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)
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from llama_cpp.server.types import (
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CreateCompletionRequest,
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CreateEmbeddingRequest,
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CreateChatCompletionRequest,
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ModelList,
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)
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from llama_cpp.server.errors import RouteErrorHandler
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router = APIRouter(route_class=RouteErrorHandler)
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_server_settings: Optional[ServerSettings] = None
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def set_server_settings(server_settings: ServerSettings):
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global _server_settings
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_server_settings = server_settings
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def get_server_settings():
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yield _server_settings
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_llama_proxy: Optional[LlamaProxy] = None
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llama_outer_lock = Lock()
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llama_inner_lock = Lock()
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def set_llama_proxy(model_settings: List[ModelSettings]):
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global _llama_proxy
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_llama_proxy = LlamaProxy(models=model_settings)
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def get_llama_proxy():
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# NOTE: This double lock allows the currently streaming llama model to
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# check if any other requests are pending in the same thread and cancel
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# the stream if so.
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llama_outer_lock.acquire()
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release_outer_lock = True
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try:
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llama_inner_lock.acquire()
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try:
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llama_outer_lock.release()
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release_outer_lock = False
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yield _llama_proxy
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finally:
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llama_inner_lock.release()
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finally:
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if release_outer_lock:
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llama_outer_lock.release()
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def create_app(
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settings: Settings | None = None,
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server_settings: ServerSettings | None = None,
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model_settings: List[ModelSettings] | None = None,
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):
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config_file = os.environ.get("CONFIG_FILE", None)
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if config_file is not None:
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if not os.path.exists(config_file):
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raise ValueError(f"Config file {config_file} not found!")
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with open(config_file, "rb") as f:
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config_file_settings = ConfigFileSettings.model_validate_json(f.read())
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server_settings = ServerSettings.model_validate(config_file_settings)
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model_settings = config_file_settings.models
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if server_settings is None and model_settings is None:
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if settings is None:
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settings = Settings()
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server_settings = ServerSettings.model_validate(settings)
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model_settings = [ModelSettings.model_validate(settings)]
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assert (
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server_settings is not None and model_settings is not None
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), "server_settings and model_settings must be provided together"
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set_server_settings(server_settings)
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middleware = [Middleware(RawContextMiddleware, plugins=(RequestIdPlugin(),))]
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app = FastAPI(
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middleware=middleware,
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title="🦙 llama.cpp Python API",
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version=llama_cpp.__version__,
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)
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app.add_middleware(
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CORSMiddleware,
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allow_origins=["*"],
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allow_credentials=True,
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allow_methods=["*"],
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allow_headers=["*"],
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)
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app.include_router(router)
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assert model_settings is not None
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set_llama_proxy(model_settings=model_settings)
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return app
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async def get_event_publisher(
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request: Request,
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inner_send_chan: MemoryObjectSendStream,
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iterator: Iterator,
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):
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async with inner_send_chan:
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try:
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async for chunk in iterate_in_threadpool(iterator):
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await inner_send_chan.send(dict(data=json.dumps(chunk)))
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if await request.is_disconnected():
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raise anyio.get_cancelled_exc_class()()
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if (
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next(get_server_settings()).interrupt_requests
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and llama_outer_lock.locked()
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):
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await inner_send_chan.send(dict(data="[DONE]"))
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raise anyio.get_cancelled_exc_class()()
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await inner_send_chan.send(dict(data="[DONE]"))
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except anyio.get_cancelled_exc_class() as e:
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print("disconnected")
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with anyio.move_on_after(1, shield=True):
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print(f"Disconnected from client (via refresh/close) {request.client}")
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raise e
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def _logit_bias_tokens_to_input_ids(
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llama: llama_cpp.Llama,
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logit_bias: Dict[str, float],
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) -> Dict[str, float]:
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to_bias: Dict[str, float] = {}
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for token, score in logit_bias.items():
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token = token.encode("utf-8")
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for input_id in llama.tokenize(token, add_bos=False, special=True):
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to_bias[str(input_id)] = score
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return to_bias
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# Setup Bearer authentication scheme
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bearer_scheme = HTTPBearer(auto_error=False)
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async def authenticate(
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settings: Settings = Depends(get_server_settings),
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authorization: Optional[str] = Depends(bearer_scheme),
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):
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# Skip API key check if it's not set in settings
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if settings.api_key is None:
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return True
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# check bearer credentials against the api_key
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if authorization and authorization.credentials == settings.api_key:
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# api key is valid
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return authorization.credentials
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# raise http error 401
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Invalid API key",
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)
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@router.post(
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"/v1/completions",
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summary="Completion",
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dependencies=[Depends(authenticate)],
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response_model= Union[
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llama_cpp.CreateCompletionResponse,
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str,
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],
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responses={
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"200": {
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"description": "Successful Response",
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"content": {
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"application/json": {
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"schema": {
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"anyOf": [
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{"$ref": "#/components/schemas/CreateCompletionResponse"}
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],
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"title": "Completion response, when stream=False",
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}
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},
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"text/event-stream":{
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"schema": {
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"type": "string",
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"title": "Server Side Streaming response, when stream=True. " +
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"See SSE format: https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events/Using_server-sent_events#Event_stream_format", # noqa: E501
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"example": """data: {... see CreateCompletionResponse ...} \\n\\n data: ... \\n\\n ... data: [DONE]"""
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}
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}
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},
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}
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},
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)
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@router.post(
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"/v1/engines/copilot-codex/completions",
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include_in_schema=False,
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dependencies=[Depends(authenticate)],
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)
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async def create_completion(
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request: Request,
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body: CreateCompletionRequest,
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llama_proxy: LlamaProxy = Depends(get_llama_proxy),
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) -> llama_cpp.Completion:
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if isinstance(body.prompt, list):
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assert len(body.prompt) <= 1
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body.prompt = body.prompt[0] if len(body.prompt) > 0 else ""
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llama = llama_proxy(
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body.model
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if request.url.path != "/v1/engines/copilot-codex/completions"
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else "copilot-codex"
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)
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exclude = {
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"n",
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"best_of",
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"logit_bias_type",
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"user",
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}
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kwargs = body.model_dump(exclude=exclude)
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if body.logit_bias is not None:
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kwargs["logit_bias"] = (
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_logit_bias_tokens_to_input_ids(llama, body.logit_bias)
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if body.logit_bias_type == "tokens"
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else body.logit_bias
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)
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if body.grammar is not None:
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kwargs["grammar"] = llama_cpp.LlamaGrammar.from_string(body.grammar)
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iterator_or_completion: Union[
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llama_cpp.CreateCompletionResponse,
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Iterator[llama_cpp.CreateCompletionStreamResponse],
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] = await run_in_threadpool(llama, **kwargs)
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if isinstance(iterator_or_completion, Iterator):
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# EAFP: It's easier to ask for forgiveness than permission
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first_response = await run_in_threadpool(next, iterator_or_completion)
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# If no exception was raised from first_response, we can assume that
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# the iterator is valid and we can use it to stream the response.
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def iterator() -> Iterator[llama_cpp.CreateCompletionStreamResponse]:
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yield first_response
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yield from iterator_or_completion
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send_chan, recv_chan = anyio.create_memory_object_stream(10)
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return EventSourceResponse(
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recv_chan,
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data_sender_callable=partial( # type: ignore
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get_event_publisher,
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request=request,
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inner_send_chan=send_chan,
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iterator=iterator(),
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),
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)
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else:
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return iterator_or_completion
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@router.post(
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"/v1/embeddings", summary="Embedding", dependencies=[Depends(authenticate)]
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)
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async def create_embedding(
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request: CreateEmbeddingRequest,
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llama_proxy: LlamaProxy = Depends(get_llama_proxy),
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):
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return await run_in_threadpool(
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llama_proxy(request.model).create_embedding,
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**request.model_dump(exclude={"user"}),
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)
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@router.post(
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"/v1/chat/completions", summary="Chat", dependencies=[Depends(authenticate)],
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response_model= Union[
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llama_cpp.ChatCompletion, str
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],
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responses={
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"200": {
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"description": "Successful Response",
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"content": {
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"application/json": {
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"schema": {
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"anyOf": [
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{"$ref": "#/components/schemas/CreateChatCompletionResponse"}
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],
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"title": "Completion response, when stream=False",
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}
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},
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"text/event-stream":{
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"schema": {
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"type": "string",
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"title": "Server Side Streaming response, when stream=True" +
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"See SSE format: https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events/Using_server-sent_events#Event_stream_format", # noqa: E501
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"example": """data: {... see CreateChatCompletionResponse ...} \\n\\n data: ... \\n\\n ... data: [DONE]"""
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}
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}
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},
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}
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},
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)
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async def create_chat_completion(
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request: Request,
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body: CreateChatCompletionRequest,
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llama_proxy: LlamaProxy = Depends(get_llama_proxy),
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) -> llama_cpp.ChatCompletion:
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exclude = {
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"n",
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"logit_bias_type",
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"user",
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}
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kwargs = body.model_dump(exclude=exclude)
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llama = llama_proxy(body.model)
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if body.logit_bias is not None:
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kwargs["logit_bias"] = (
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_logit_bias_tokens_to_input_ids(llama, body.logit_bias)
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if body.logit_bias_type == "tokens"
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else body.logit_bias
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)
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if body.grammar is not None:
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kwargs["grammar"] = llama_cpp.LlamaGrammar.from_string(body.grammar)
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iterator_or_completion: Union[
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llama_cpp.ChatCompletion, Iterator[llama_cpp.ChatCompletionChunk]
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] = await run_in_threadpool(llama.create_chat_completion, **kwargs)
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if isinstance(iterator_or_completion, Iterator):
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# EAFP: It's easier to ask for forgiveness than permission
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first_response = await run_in_threadpool(next, iterator_or_completion)
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# If no exception was raised from first_response, we can assume that
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# the iterator is valid and we can use it to stream the response.
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def iterator() -> Iterator[llama_cpp.ChatCompletionChunk]:
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yield first_response
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yield from iterator_or_completion
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send_chan, recv_chan = anyio.create_memory_object_stream(10)
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return EventSourceResponse(
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recv_chan,
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data_sender_callable=partial( # type: ignore
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get_event_publisher,
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request=request,
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inner_send_chan=send_chan,
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iterator=iterator(),
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),
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)
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else:
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return iterator_or_completion
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@router.get("/v1/models", summary="Models", dependencies=[Depends(authenticate)])
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async def get_models(
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llama_proxy: LlamaProxy = Depends(get_llama_proxy),
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) -> ModelList:
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return {
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"object": "list",
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"data": [
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{
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"id": model_alias,
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"object": "model",
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"owned_by": "me",
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"permissions": [],
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}
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for model_alias in llama_proxy
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],
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}
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