stable/freqtrade/rpc/api_server/webserver.py
2022-11-17 10:16:38 +00:00

261 lines
9.3 KiB
Python

import asyncio
import logging
from ipaddress import IPv4Address
from threading import Thread
from typing import Any, Dict, Optional
import orjson
import uvicorn
from fastapi import Depends, FastAPI
from fastapi.middleware.cors import CORSMiddleware
# Look into alternatives
from janus import Queue as ThreadedQueue
from starlette.responses import JSONResponse
from freqtrade.constants import Config
from freqtrade.exceptions import OperationalException
from freqtrade.rpc.api_server.uvicorn_threaded import UvicornServer
from freqtrade.rpc.api_server.ws import ChannelManager
from freqtrade.rpc.api_server.ws_schemas import WSMessageSchemaType
from freqtrade.rpc.rpc import RPC, RPCException, RPCHandler
logger = logging.getLogger(__name__)
class FTJSONResponse(JSONResponse):
media_type = "application/json"
def render(self, content: Any) -> bytes:
"""
Use rapidjson for responses
Handles NaN and Inf / -Inf in a javascript way by default.
"""
return orjson.dumps(content, option=orjson.OPT_SERIALIZE_NUMPY)
class ApiServer(RPCHandler):
__instance = None
__initialized = False
_rpc: RPC
# Backtesting type: Backtesting
_bt = None
_bt_data = None
_bt_timerange = None
_bt_last_config: Config = {}
_has_rpc: bool = False
_bgtask_running: bool = False
_config: Config = {}
# Exchange - only available in webserver mode.
_exchange = None
# websocket message queue stuff
_ws_channel_manager: ChannelManager
_ws_thread = None
_ws_loop: Optional[asyncio.AbstractEventLoop] = None
def __new__(cls, *args, **kwargs):
"""
This class is a singleton.
We'll only have one instance of it around.
"""
if ApiServer.__instance is None:
ApiServer.__instance = object.__new__(cls)
ApiServer.__initialized = False
return ApiServer.__instance
def __init__(self, config: Config, standalone: bool = False) -> None:
ApiServer._config = config
if self.__initialized and (standalone or self._standalone):
return
self._standalone: bool = standalone
self._server = None
self._ws_queue: Optional[ThreadedQueue] = None
self._ws_background_task = None
ApiServer.__initialized = True
api_config = self._config['api_server']
ApiServer._ws_channel_manager = ChannelManager()
self.app = FastAPI(title="Freqtrade API",
docs_url='/docs' if api_config.get('enable_openapi', False) else None,
redoc_url=None,
default_response_class=FTJSONResponse,
)
self.configure_app(self.app, self._config)
self.start_api()
def add_rpc_handler(self, rpc: RPC):
"""
Attach rpc handler
"""
if not self._has_rpc:
ApiServer._rpc = rpc
ApiServer._has_rpc = True
else:
# This should not happen assuming we didn't mess up.
raise OperationalException('RPC Handler already attached.')
def cleanup(self) -> None:
""" Cleanup pending module resources """
ApiServer._has_rpc = False
del ApiServer._rpc
if self._server and not self._standalone:
logger.info("Stopping API Server")
self._server.cleanup()
if self._ws_thread and self._ws_loop:
logger.info("Stopping API Server background tasks")
if self._ws_background_task:
# Cancel the queue task
self._ws_background_task.cancel()
self._ws_thread.join()
self._ws_thread = None
self._ws_loop = None
self._ws_background_task = None
@classmethod
def shutdown(cls):
cls.__initialized = False
del cls.__instance
cls.__instance = None
cls._has_rpc = False
cls._rpc = None
def send_msg(self, msg: Dict[str, Any]) -> None:
if self._ws_queue:
sync_q = self._ws_queue.sync_q
sync_q.put(msg)
def handle_rpc_exception(self, request, exc):
logger.exception(f"API Error calling: {exc}")
return JSONResponse(
status_code=502,
content={'error': f"Error querying {request.url.path}: {exc.message}"}
)
def configure_app(self, app: FastAPI, config):
from freqtrade.rpc.api_server.api_auth import http_basic_or_jwt_token, router_login
from freqtrade.rpc.api_server.api_backtest import router as api_backtest
from freqtrade.rpc.api_server.api_v1 import router as api_v1
from freqtrade.rpc.api_server.api_v1 import router_public as api_v1_public
from freqtrade.rpc.api_server.api_ws import router as ws_router
from freqtrade.rpc.api_server.web_ui import router_ui
app.include_router(api_v1_public, prefix="/api/v1")
app.include_router(api_v1, prefix="/api/v1",
dependencies=[Depends(http_basic_or_jwt_token)],
)
app.include_router(api_backtest, prefix="/api/v1",
dependencies=[Depends(http_basic_or_jwt_token)],
)
app.include_router(ws_router, prefix="/api/v1")
app.include_router(router_login, prefix="/api/v1", tags=["auth"])
# UI Router MUST be last!
app.include_router(router_ui, prefix='')
app.add_middleware(
CORSMiddleware,
allow_origins=config['api_server'].get('CORS_origins', []),
allow_credentials=True,
allow_methods=["*"],
allow_headers=["*"],
)
app.add_exception_handler(RPCException, self.handle_rpc_exception)
def start_message_queue(self):
if self._ws_thread:
return
# Create a new loop, as it'll be just for the background thread
self._ws_loop = asyncio.new_event_loop()
# Start the thread
self._ws_thread = Thread(target=self._ws_loop.run_forever)
self._ws_thread.start()
# Finally, submit the coro to the thread
self._ws_background_task = asyncio.run_coroutine_threadsafe(
self._broadcast_queue_data(), loop=self._ws_loop)
async def _broadcast_queue_data(self) -> None:
# Instantiate the queue in this coroutine so it's attached to our loop
self._ws_queue = ThreadedQueue()
async_queue = self._ws_queue.async_q
try:
while True:
logger.debug("Getting queue messages...")
# Get data from queue
message: WSMessageSchemaType = await async_queue.get()
logger.debug(f"Found message of type: {message.get('type')}")
async_queue.task_done()
# Broadcast it
await self._ws_channel_manager.broadcast(message)
except asyncio.CancelledError:
pass
# For testing, shouldn't happen when stable
except Exception as e:
logger.exception(f"Exception happened in background task: {e}")
finally:
# Disconnect channels and stop the loop on cancel
await self._ws_channel_manager.disconnect_all()
if self._ws_loop:
self._ws_loop.stop()
# Avoid adding more items to the queue if they aren't
# going to get broadcasted.
self._ws_queue = None
def start_api(self):
"""
Start API ... should be run in thread.
"""
rest_ip = self._config['api_server']['listen_ip_address']
rest_port = self._config['api_server']['listen_port']
logger.info(f'Starting HTTP Server at {rest_ip}:{rest_port}')
if not IPv4Address(rest_ip).is_loopback:
logger.warning("SECURITY WARNING - Local Rest Server listening to external connections")
logger.warning("SECURITY WARNING - This is insecure please set to your loopback,"
"e.g 127.0.0.1 in config.json")
if not self._config['api_server'].get('password'):
logger.warning("SECURITY WARNING - No password for local REST Server defined. "
"Please make sure that this is intentional!")
if (self._config['api_server'].get('jwt_secret_key', 'super-secret')
in ('super-secret, somethingrandom')):
logger.warning("SECURITY WARNING - `jwt_secret_key` seems to be default."
"Others may be able to log into your bot.")
logger.info('Starting Local Rest Server.')
verbosity = self._config['api_server'].get('verbosity', 'error')
uvconfig = uvicorn.Config(self.app,
port=rest_port,
host=rest_ip,
use_colors=False,
log_config=None,
access_log=True if verbosity != 'error' else False,
ws_ping_interval=None # We do this explicitly ourselves
)
try:
self._server = UvicornServer(uvconfig)
if self._standalone:
self._server.run()
else:
self.start_message_queue()
self._server.run_in_thread()
except Exception:
logger.exception("Api server failed to start.")