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Make candle_limit optionally timeframe dependent

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This commit is contained in:
Matthias
2021-02-14 10:29:45 +01:00
parent 7ecf8f8b80
commit 5622bb3247
5 changed files with 35 additions and 22 deletions
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37
freqtrade/exchange/exchange.py
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@@ -101,7 +101,6 @@ class Exchange:
logger.info("Overriding exchange._ft_has with config params, result: %s", self._ft_has)
# Assign this directly for easy access
self._ohlcv_candle_limit = self._ft_has['ohlcv_candle_limit']
self._ohlcv_partial_candle = self._ft_has['ohlcv_partial_candle']
self._trades_pagination = self._ft_has['trades_pagination']
@@ -137,7 +136,8 @@ class Exchange:
self.validate_pairs(config['exchange']['pair_whitelist'])
self.validate_ordertypes(config.get('order_types', {}))
self.validate_order_time_in_force(config.get('order_time_in_force', {}))
self.validate_required_startup_candles(config.get('startup_candle_count', 0))
self.validate_required_startup_candles(config.get('startup_candle_count', 0),
config.get('timeframe'))
# Converts the interval provided in minutes in config to seconds
self.markets_refresh_interval: int = exchange_config.get(
@@ -198,11 +198,6 @@ class Exchange:
def timeframes(self) -> List[str]:
return list((self._api.timeframes or {}).keys())
@property
def ohlcv_candle_limit(self) -> int:
"""exchange ohlcv candle limit"""
return int(self._ohlcv_candle_limit)
@property
def markets(self) -> Dict:
"""exchange ccxt markets"""
@@ -216,6 +211,17 @@ class Exchange:
"""exchange ccxt precisionMode"""
return self._api.precisionMode
def ohlcv_candle_limit(self, timeframe: str) -> int:
"""
Exchange ohlcv candle limit
Uses ohlcv_candle_limit_per_timeframe if the exchange has different limts
per timeframe (e.g. bittrex), otherwise falls back to ohlcv_candle_limit
:param timeframe: Timeframe to check
:return: Candle limit as integer
"""
return int(self._ft_has.get('ohlcv_candle_limit_per_timeframe', {}).get(
timeframe, self._ft_has.get('ohlcv_candle_limit')))
def get_markets(self, base_currencies: List[str] = None, quote_currencies: List[str] = None,
pairs_only: bool = False, active_only: bool = False) -> Dict[str, Any]:
"""
@@ -428,15 +434,16 @@ class Exchange:
raise OperationalException(
f'Time in force policies are not supported for {self.name} yet.')
def validate_required_startup_candles(self, startup_candles: int) -> None:
def validate_required_startup_candles(self, startup_candles: int, timeframe: str) -> None:
"""
Checks if required startup_candles is more than ohlcv_candle_limit.
Checks if required startup_candles is more than ohlcv_candle_limit().
Requires a grace-period of 5 candles - so a startup-period up to 494 is allowed by default.
"""
if startup_candles + 5 > self.ohlcv_candle_limit:
candle_limit = self.ohlcv_candle_limit(timeframe)
if startup_candles + 5 > candle_limit:
raise OperationalException(
f"This strategy requires {startup_candles} candles to start. "
f"{self.name} only provides {self.ohlcv_candle_limit}.")
f"{self.name} only provides {candle_limit} for {timeframe}.")
def exchange_has(self, endpoint: str) -> bool:
"""
@@ -721,7 +728,7 @@ class Exchange:
"""
Get candle history using asyncio and returns the list of candles.
Handles all async work for this.
Async over one pair, assuming we get `self.ohlcv_candle_limit` candles per call.
Async over one pair, assuming we get `self.ohlcv_candle_limit()` candles per call.
:param pair: Pair to download
:param timeframe: Timeframe to get data for
:param since_ms: Timestamp in milliseconds to get history from
@@ -751,7 +758,7 @@ class Exchange:
Download historic ohlcv
"""
one_call = timeframe_to_msecs(timeframe) * self.ohlcv_candle_limit
one_call = timeframe_to_msecs(timeframe) * self.ohlcv_candle_limit(timeframe)
logger.debug(
"one_call: %s msecs (%s)",
one_call,
@@ -853,7 +860,7 @@ class Exchange:
data = await self._api_async.fetch_ohlcv(pair, timeframe=timeframe,
since=since_ms,
limit=self.ohlcv_candle_limit)
limit=self.ohlcv_candle_limit(timeframe))
# Some exchanges sort OHLCV in ASC order and others in DESC.
# Ex: Bittrex returns the list of OHLCV in ASC order (oldest first, newest last)
@@ -1026,7 +1033,7 @@ class Exchange:
"""
Get trade history data using asyncio.
Handles all async work and returns the list of candles.
Async over one pair, assuming we get `self.ohlcv_candle_limit` candles per call.
Async over one pair, assuming we get `self.ohlcv_candle_limit()` candles per call.
:param pair: Pair to download
:param since: Timestamp in milliseconds to get history from
:param until: Timestamp in milliseconds. Defaults to current timestamp if not defined.