stable/freqtrade/rpc/api_server/webserver.py

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import asyncio
import logging
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from ipaddress import IPv4Address
from threading import Thread
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from typing import Any, Dict
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import orjson
import uvicorn
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from fastapi import Depends, FastAPI
from fastapi.middleware.cors import CORSMiddleware
# Look into alternatives
from janus import Queue as ThreadedQueue
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from starlette.responses import JSONResponse
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from freqtrade.constants import Config
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from freqtrade.exceptions import OperationalException
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from freqtrade.rpc.api_server.uvicorn_threaded import UvicornServer
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from freqtrade.rpc.api_server.ws import ChannelManager
from freqtrade.rpc.rpc import RPC, RPCException, RPCHandler
logger = logging.getLogger(__name__)
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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.
"""
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return orjson.dumps(content, option=orjson.OPT_SERIALIZE_NUMPY)
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class ApiServer(RPCHandler):
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__instance = None
__initialized = False
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_rpc: RPC
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# Backtesting type: Backtesting
_bt = None
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_bt_data = None
_bt_timerange = None
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_bt_last_config: Config = {}
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_has_rpc: bool = False
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_bgtask_running: bool = False
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_config: Config = {}
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# Exchange - only available in webserver mode.
_exchange = None
# websocket message queue stuff
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_ws_channel_manager = None
_ws_thread = None
_ws_loop = None
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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
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def __init__(self, config: Config, standalone: bool = False) -> None:
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ApiServer._config = config
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if self.__initialized and (standalone or self._standalone):
return
self._standalone: bool = standalone
self._server = None
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self._ws_queue = None
self._ws_background_task = None
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ApiServer.__initialized = True
api_config = self._config['api_server']
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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,
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default_response_class=FTJSONResponse,
)
self.configure_app(self.app, self._config)
self.start_api()
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def add_rpc_handler(self, rpc: RPC):
"""
Attach rpc handler
"""
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if not self._has_rpc:
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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 """
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ApiServer._has_rpc = False
del ApiServer._rpc
if self._server and not self._standalone:
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logger.info("Stopping API Server")
self._server.cleanup()
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if self._ws_thread and self._ws_loop:
logger.info("Stopping API Server background tasks")
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if self._ws_background_task:
# Cancel the queue task
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self._ws_background_task.cancel()
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self._ws_thread.join()
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self._ws_thread = None
self._ws_loop = None
self._ws_background_task = None
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@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, str]) -> None:
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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):
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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
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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
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from freqtrade.rpc.api_server.web_ui import router_ui
app.include_router(api_v1_public, prefix="/api/v1")
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app.include_router(api_v1, prefix="/api/v1",
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dependencies=[Depends(http_basic_or_jwt_token)],
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)
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app.include_router(api_backtest, prefix="/api/v1",
dependencies=[Depends(http_basic_or_jwt_token)],
)
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app.include_router(ws_router, prefix="/api/v1")
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app.include_router(router_login, prefix="/api/v1", tags=["auth"])
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# 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):
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if self._ws_thread:
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return
# Create a new loop, as it'll be just for the background thread
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self._ws_loop = asyncio.new_event_loop()
# Start the thread
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self._ws_thread = Thread(target=self._ws_loop.run_forever)
self._ws_thread.start()
# Finally, submit the coro to the thread
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self._ws_background_task = asyncio.run_coroutine_threadsafe(
self._broadcast_queue_data(), loop=self._ws_loop)
async def _broadcast_queue_data(self):
# Instantiate the queue in this coroutine so it's attached to our loop
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self._ws_queue = ThreadedQueue()
async_queue = self._ws_queue.async_q
try:
while True:
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logger.debug("Getting queue messages...")
# Get data from queue
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message = await async_queue.get()
logger.debug(f"Found message of type: {message.get('type')}")
# Broadcast it
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await self._ws_channel_manager.broadcast(message)
# Sleep, make this configurable?
await asyncio.sleep(0.1)
except asyncio.CancelledError:
pass
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# 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()
self._ws_loop.stop()
def start_api(self):
"""
Start API ... should be run in thread.
"""
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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!")
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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.")
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logger.info('Starting Local Rest Server.')
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verbosity = self._config['api_server'].get('verbosity', 'error')
uvconfig = uvicorn.Config(self.app,
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port=rest_port,
host=rest_ip,
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use_colors=False,
log_config=None,
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access_log=True if verbosity != 'error' else False,
)
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try:
self._server = UvicornServer(uvconfig)
if self._standalone:
self._server.run()
else:
self.start_message_queue()
self._server.run_in_thread()
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except Exception:
logger.exception("Api server failed to start.")