344 lines
13 KiB
Python
344 lines
13 KiB
Python
"""
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Dataprovider
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Responsible to provide data to the bot
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including ticker and orderbook data, live and historical candle (OHLCV) data
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Common Interface for bot and strategy to access data.
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"""
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import logging
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from collections import deque
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from datetime import datetime, timezone
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from threading import Event
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from typing import Any, Dict, List, Optional, Tuple
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from pandas import DataFrame
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from freqtrade.configuration import TimeRange
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from freqtrade.constants import ListPairsWithTimeframes, PairWithTimeframe
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from freqtrade.data.history import load_pair_history
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from freqtrade.enums import CandleType, RunMode
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from freqtrade.exceptions import ExchangeError, OperationalException
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from freqtrade.exchange import Exchange, timeframe_to_seconds
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from freqtrade.util import PeriodicCache
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logger = logging.getLogger(__name__)
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NO_EXCHANGE_EXCEPTION = 'Exchange is not available to DataProvider.'
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MAX_DATAFRAME_CANDLES = 1000
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class DataProvider:
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def __init__(self, config: dict, exchange: Optional[Exchange],
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pairlists=None, replicate_controller=None) -> None:
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self._config = config
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self._exchange = exchange
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self._pairlists = pairlists
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self.__cached_pairs: Dict[PairWithTimeframe, Tuple[DataFrame, datetime]] = {}
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self.__slice_index: Optional[int] = None
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self.__cached_pairs_backtesting: Dict[PairWithTimeframe, DataFrame] = {}
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self.__external_pairs_df: Dict[PairWithTimeframe, Tuple[DataFrame, datetime]] = {}
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self.__external_pairs_event: Dict[str, Event] = {}
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self._msg_queue: deque = deque()
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self.__msg_cache = PeriodicCache(
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maxsize=1000, ttl=timeframe_to_seconds(self._config.get('timeframe', '1h')))
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def _set_dataframe_max_index(self, limit_index: int):
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"""
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Limit analyzed dataframe to max specified index.
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:param limit_index: dataframe index.
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"""
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self.__slice_index = limit_index
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def _set_cached_df(
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self,
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pair: str,
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timeframe: str,
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dataframe: DataFrame,
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candle_type: CandleType
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) -> None:
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"""
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Store cached Dataframe.
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Using private method as this should never be used by a user
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(but the class is exposed via `self.dp` to the strategy)
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:param pair: pair to get the data for
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:param timeframe: Timeframe to get data for
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:param dataframe: analyzed dataframe
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:param candle_type: Any of the enum CandleType (must match trading mode!)
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"""
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pair_key = (pair, timeframe, candle_type)
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self.__cached_pairs[pair_key] = (
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dataframe, datetime.now(timezone.utc))
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def add_external_df(
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self,
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pair: str,
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timeframe: str,
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dataframe: DataFrame,
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candle_type: CandleType
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) -> None:
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"""
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Add the DataFrame to the __external_pairs_df. If a pair event exists,
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set it to release the main thread from waiting.
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"""
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pair_key = (pair, timeframe, candle_type)
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# Delete stale data
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if pair_key in self.__external_pairs_df:
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del self.__external_pairs_df[pair_key]
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self.__external_pairs_df[pair_key] = (dataframe, datetime.now(timezone.utc))
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pair_event = self.__external_pairs_event.get(pair)
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if pair_event:
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logger.debug(f"Leader data for pair {pair_key} has been added")
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pair_event.set()
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def get_external_df(
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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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) -> DataFrame:
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"""
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If the pair exists in __external_pairs_df, return it. If it doesn't,
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create a new threading Event in __external_pairs_event and wait on it.
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"""
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pair_key = (pair, timeframe, candle_type)
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if pair_key not in self.__external_pairs_df:
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pair_event = Event()
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self.__external_pairs_event[pair] = pair_event
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logger.debug(f"Waiting on Leader data for: {pair_key}")
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self.__external_pairs_event[pair].wait()
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if pair_key in self.__external_pairs_df:
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return self.__external_pairs_df[pair_key]
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# Because of the waiting mechanism, this should never return
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return (DataFrame(), datetime.fromtimestamp(0, tz=timezone.utc))
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def add_pairlisthandler(self, pairlists) -> None:
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"""
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Allow adding pairlisthandler after initialization
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"""
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self._pairlists = pairlists
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def historic_ohlcv(
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self,
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pair: str,
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timeframe: str = None,
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candle_type: str = ''
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) -> DataFrame:
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"""
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Get stored historical candle (OHLCV) data
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:param pair: pair to get the data for
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:param timeframe: timeframe to get data for
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:param candle_type: '', mark, index, premiumIndex, or funding_rate
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"""
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_candle_type = CandleType.from_string(
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candle_type) if candle_type != '' else self._config['candle_type_def']
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saved_pair = (pair, str(timeframe), _candle_type)
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if saved_pair not in self.__cached_pairs_backtesting:
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timerange = TimeRange.parse_timerange(None if self._config.get(
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'timerange') is None else str(self._config.get('timerange')))
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# Move informative start time respecting startup_candle_count
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timerange.subtract_start(
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timeframe_to_seconds(str(timeframe)) * self._config.get('startup_candle_count', 0)
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)
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self.__cached_pairs_backtesting[saved_pair] = load_pair_history(
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pair=pair,
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timeframe=timeframe or self._config['timeframe'],
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datadir=self._config['datadir'],
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timerange=timerange,
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data_format=self._config.get('dataformat_ohlcv', 'json'),
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candle_type=_candle_type,
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)
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return self.__cached_pairs_backtesting[saved_pair].copy()
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def get_pair_dataframe(
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self,
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pair: str,
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timeframe: str = None,
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candle_type: str = ''
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) -> DataFrame:
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"""
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Return pair candle (OHLCV) data, either live or cached historical -- depending
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on the runmode.
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Only combinations in the pairlist or which have been specified as informative pairs
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will be available.
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:param pair: pair to get the data for
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:param timeframe: timeframe to get data for
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:return: Dataframe for this pair
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:param candle_type: '', mark, index, premiumIndex, or funding_rate
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"""
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if self.runmode in (RunMode.DRY_RUN, RunMode.LIVE):
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# Get live OHLCV data.
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data = self.ohlcv(pair=pair, timeframe=timeframe, candle_type=candle_type)
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else:
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# Get historical OHLCV data (cached on disk).
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data = self.historic_ohlcv(pair=pair, timeframe=timeframe, candle_type=candle_type)
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if len(data) == 0:
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logger.warning(f"No data found for ({pair}, {timeframe}, {candle_type}).")
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return data
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def get_analyzed_dataframe(self, pair: str, timeframe: str) -> Tuple[DataFrame, datetime]:
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"""
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Retrieve the analyzed dataframe. Returns the full dataframe in trade mode (live / dry),
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and the last 1000 candles (up to the time evaluated at this moment) in all other modes.
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:param pair: pair to get the data for
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:param timeframe: timeframe to get data for
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:return: Tuple of (Analyzed Dataframe, lastrefreshed) for the requested pair / timeframe
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combination.
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Returns empty dataframe and Epoch 0 (1970-01-01) if no dataframe was cached.
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"""
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pair_key = (pair, timeframe, self._config.get('candle_type_def', CandleType.SPOT))
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if pair_key in self.__cached_pairs:
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if self.runmode in (RunMode.DRY_RUN, RunMode.LIVE):
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df, date = self.__cached_pairs[pair_key]
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else:
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df, date = self.__cached_pairs[pair_key]
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if self.__slice_index is not None:
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max_index = self.__slice_index
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df = df.iloc[max(0, max_index - MAX_DATAFRAME_CANDLES):max_index]
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return df, date
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else:
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return (DataFrame(), datetime.fromtimestamp(0, tz=timezone.utc))
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@property
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def runmode(self) -> RunMode:
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"""
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Get runmode of the bot
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can be "live", "dry-run", "backtest", "edgecli", "hyperopt" or "other".
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"""
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return RunMode(self._config.get('runmode', RunMode.OTHER))
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def current_whitelist(self) -> List[str]:
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"""
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fetch latest available whitelist.
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Useful when you have a large whitelist and need to call each pair as an informative pair.
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As available pairs does not show whitelist until after informative pairs have been cached.
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:return: list of pairs in whitelist
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"""
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if self._pairlists:
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return self._pairlists.whitelist.copy()
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else:
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raise OperationalException("Dataprovider was not initialized with a pairlist provider.")
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def clear_cache(self):
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"""
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Clear pair dataframe cache.
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"""
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self.__cached_pairs = {}
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self.__cached_pairs_backtesting = {}
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self.__slice_index = 0
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# Exchange functions
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def refresh(self,
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pairlist: ListPairsWithTimeframes,
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helping_pairs: ListPairsWithTimeframes = None) -> None:
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"""
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Refresh data, called with each cycle
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"""
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if self._exchange is None:
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raise OperationalException(NO_EXCHANGE_EXCEPTION)
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if helping_pairs:
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self._exchange.refresh_latest_ohlcv(pairlist + helping_pairs)
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else:
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self._exchange.refresh_latest_ohlcv(pairlist)
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@property
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def available_pairs(self) -> ListPairsWithTimeframes:
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"""
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Return a list of tuples containing (pair, timeframe) for which data is currently cached.
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Should be whitelist + open trades.
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"""
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if self._exchange is None:
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raise OperationalException(NO_EXCHANGE_EXCEPTION)
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return list(self._exchange._klines.keys())
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def ohlcv(
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self,
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pair: str,
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timeframe: str = None,
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copy: bool = True,
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candle_type: str = ''
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) -> DataFrame:
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"""
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Get candle (OHLCV) data for the given pair as DataFrame
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Please use the `available_pairs` method to verify which pairs are currently cached.
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:param pair: pair to get the data for
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:param timeframe: Timeframe to get data for
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:param candle_type: '', mark, index, premiumIndex, or funding_rate
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:param copy: copy dataframe before returning if True.
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Use False only for read-only operations (where the dataframe is not modified)
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"""
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if self._exchange is None:
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raise OperationalException(NO_EXCHANGE_EXCEPTION)
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if self.runmode in (RunMode.DRY_RUN, RunMode.LIVE):
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_candle_type = CandleType.from_string(
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candle_type) if candle_type != '' else self._config['candle_type_def']
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return self._exchange.klines(
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(pair, timeframe or self._config['timeframe'], _candle_type),
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copy=copy
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)
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else:
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return DataFrame()
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def market(self, pair: str) -> Optional[Dict[str, Any]]:
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"""
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Return market data for the pair
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:param pair: Pair to get the data for
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:return: Market data dict from ccxt or None if market info is not available for the pair
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"""
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if self._exchange is None:
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raise OperationalException(NO_EXCHANGE_EXCEPTION)
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return self._exchange.markets.get(pair)
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def ticker(self, pair: str):
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"""
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Return last ticker data from exchange
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:param pair: Pair to get the data for
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:return: Ticker dict from exchange or empty dict if ticker is not available for the pair
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"""
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if self._exchange is None:
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raise OperationalException(NO_EXCHANGE_EXCEPTION)
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try:
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return self._exchange.fetch_ticker(pair)
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except ExchangeError:
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return {}
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def orderbook(self, pair: str, maximum: int) -> Dict[str, List]:
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"""
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Fetch latest l2 orderbook data
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Warning: Does a network request - so use with common sense.
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:param pair: pair to get the data for
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:param maximum: Maximum number of orderbook entries to query
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:return: dict including bids/asks with a total of `maximum` entries.
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"""
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if self._exchange is None:
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raise OperationalException(NO_EXCHANGE_EXCEPTION)
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return self._exchange.fetch_l2_order_book(pair, maximum)
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def send_msg(self, message: str, *, always_send: bool = False) -> None:
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"""
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Send custom RPC Notifications from your bot.
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Will not send any bot in modes other than Dry-run or Live.
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:param message: Message to be sent. Must be below 4096.
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:param always_send: If False, will send the message only once per candle, and surpress
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identical messages.
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Careful as this can end up spaming your chat.
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Defaults to False
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"""
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if self.runmode not in (RunMode.DRY_RUN, RunMode.LIVE):
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return
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if always_send or message not in self.__msg_cache:
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self._msg_queue.append(message)
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self.__msg_cache[message] = True
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