mirror of
https://github.com/freqtrade/freqtrade.git
synced 2024-11-15 12:43:56 +00:00
195 lines
7.6 KiB
Python
195 lines
7.6 KiB
Python
import asyncio
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import logging
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import time
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from copy import deepcopy
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from functools import partial
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from threading import Thread
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import ccxt
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from freqtrade.constants import Config, PairWithTimeframe
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from freqtrade.enums.candletype import CandleType
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from freqtrade.exchange.exchange import timeframe_to_seconds
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from freqtrade.exchange.exchange_types import OHLCVResponse
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from freqtrade.util import dt_ts, format_ms_time
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logger = logging.getLogger(__name__)
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class ExchangeWS:
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def __init__(self, config: Config, ccxt_object: ccxt.Exchange) -> None:
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self.config = config
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self.ccxt_object = ccxt_object
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self._background_tasks: set[asyncio.Task] = set()
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self._klines_watching: set[PairWithTimeframe] = set()
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self._klines_scheduled: set[PairWithTimeframe] = set()
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self.klines_last_refresh: dict[PairWithTimeframe, float] = {}
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self.klines_last_request: dict[PairWithTimeframe, float] = {}
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self._thread = Thread(name="ccxt_ws", target=self._start_forever)
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self._thread.start()
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self.__cleanup_called = False
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def _start_forever(self) -> None:
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self._loop = asyncio.new_event_loop()
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try:
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self._loop.run_forever()
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finally:
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if self._loop.is_running():
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self._loop.stop()
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def cleanup(self) -> None:
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logger.debug("Cleanup called - stopping")
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self._klines_watching.clear()
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for task in self._background_tasks:
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task.cancel()
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if hasattr(self, "_loop") and not self._loop.is_closed():
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self.reset_connections()
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self._loop.call_soon_threadsafe(self._loop.stop)
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time.sleep(0.1)
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if not self._loop.is_closed():
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self._loop.close()
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self._thread.join()
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logger.debug("Stopped")
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def reset_connections(self) -> None:
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"""
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Reset all connections - avoids "connection-reset" errors that happen after ~9 days
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"""
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if hasattr(self, "_loop") and not self._loop.is_closed():
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logger.info("Resetting WS connections.")
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asyncio.run_coroutine_threadsafe(self._cleanup_async(), loop=self._loop)
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while not self.__cleanup_called:
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time.sleep(0.1)
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self.__cleanup_called = False
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async def _cleanup_async(self) -> None:
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try:
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await self.ccxt_object.close()
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# Clear the cache.
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# Not doing this will cause problems on startup with dynamic pairlists
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self.ccxt_object.ohlcvs.clear()
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except Exception:
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logger.exception("Exception in _cleanup_async")
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finally:
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self.__cleanup_called = True
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def _pop_history(self, paircomb: PairWithTimeframe) -> None:
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"""
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Remove history for a pair/timeframe combination from ccxt cache
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"""
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self.ccxt_object.ohlcvs.get(paircomb[0], {}).pop(paircomb[1], None)
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def cleanup_expired(self) -> None:
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"""
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Remove pairs from watchlist if they've not been requested within
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the last timeframe (+ offset)
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"""
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changed = False
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for p in list(self._klines_watching):
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_, timeframe, _ = p
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timeframe_s = timeframe_to_seconds(timeframe)
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last_refresh = self.klines_last_request.get(p, 0)
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if last_refresh > 0 and (dt_ts() - last_refresh) > ((timeframe_s + 20) * 1000):
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logger.info(f"Removing {p} from websocket watchlist.")
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self._klines_watching.discard(p)
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# Pop history to avoid getting stale data
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self._pop_history(p)
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changed = True
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if changed:
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logger.info(f"Removal done: new watch list ({len(self._klines_watching)})")
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async def _schedule_while_true(self) -> None:
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# For the ones we should be watching
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for p in self._klines_watching:
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# Check if they're already scheduled
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if p not in self._klines_scheduled:
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self._klines_scheduled.add(p)
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pair, timeframe, candle_type = p
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task = asyncio.create_task(
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self._continuously_async_watch_ohlcv(pair, timeframe, candle_type)
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)
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self._background_tasks.add(task)
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task.add_done_callback(
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partial(
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self._continuous_stopped,
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pair=pair,
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timeframe=timeframe,
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candle_type=candle_type,
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)
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)
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def _continuous_stopped(
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self, task: asyncio.Task, pair: str, timeframe: str, candle_type: CandleType
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):
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self._background_tasks.discard(task)
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result = "done"
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if task.cancelled():
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result = "cancelled"
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else:
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if (result1 := task.result()) is not None:
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result = str(result1)
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logger.info(f"{pair}, {timeframe}, {candle_type} - Task finished - {result}")
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self._klines_scheduled.discard((pair, timeframe, candle_type))
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self._pop_history((pair, timeframe, candle_type))
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async def _continuously_async_watch_ohlcv(
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self, pair: str, timeframe: str, candle_type: CandleType
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) -> None:
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try:
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while (pair, timeframe, candle_type) in self._klines_watching:
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start = dt_ts()
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data = await self.ccxt_object.watch_ohlcv(pair, timeframe)
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self.klines_last_refresh[(pair, timeframe, candle_type)] = dt_ts()
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logger.debug(
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f"watch done {pair}, {timeframe}, data {len(data)} "
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f"in {dt_ts() - start:.2f}s"
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)
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except ccxt.ExchangeClosedByUser:
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logger.debug("Exchange connection closed by user")
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except ccxt.BaseError:
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logger.exception(f"Exception in continuously_async_watch_ohlcv for {pair}, {timeframe}")
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finally:
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self._klines_watching.discard((pair, timeframe, candle_type))
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def schedule_ohlcv(self, pair: str, timeframe: str, candle_type: CandleType) -> None:
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"""
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Schedule a pair/timeframe combination to be watched
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"""
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self._klines_watching.add((pair, timeframe, candle_type))
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self.klines_last_request[(pair, timeframe, candle_type)] = dt_ts()
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# asyncio.run_coroutine_threadsafe(self.schedule_schedule(), loop=self._loop)
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asyncio.run_coroutine_threadsafe(self._schedule_while_true(), loop=self._loop)
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self.cleanup_expired()
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async def get_ohlcv(
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self,
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pair: str,
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timeframe: str,
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candle_type: CandleType,
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candle_date: int,
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) -> OHLCVResponse:
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"""
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Returns cached klines from ccxt's "watch" cache.
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:param candle_date: timestamp of the end-time of the candle.
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"""
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# Deepcopy the response - as it might be modified in the background as new messages arrive
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candles = deepcopy(self.ccxt_object.ohlcvs.get(pair, {}).get(timeframe))
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refresh_date = self.klines_last_refresh[(pair, timeframe, candle_type)]
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drop_hint = False
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if refresh_date > candle_date:
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# Refreshed after candle was complete.
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# logger.info(f"{candles[-1][0]} >= {candle_date}")
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drop_hint = candles[-1][0] >= candle_date
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logger.debug(
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f"watch result for {pair}, {timeframe} with length {len(candles)}, "
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f"{format_ms_time(candles[-1][0])}, "
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f"lref={format_ms_time(refresh_date)}, "
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f"candle_date={format_ms_time(candle_date)}, {drop_hint=}"
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)
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return pair, timeframe, candle_type, candles, drop_hint
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