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moved fill_leverage_brackets and get_max_leverage to base exchange class, wrote parse_leverage_tier and load_leverage_brackets

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pull/6373/head
Sam Germain 4 years ago
parent a99cf2eeed
commit 6b9915bc73
4 changed files with 145 additions and 146 deletions
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135
freqtrade/exchange/binance.py
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@ -128,128 +128,6 @@ class Binance(Exchange):
except ccxt.BaseError as e:
raise OperationalException(e) from e
@retrier
def fill_leverage_brackets(self) -> None:
"""
Assigns property _leverage_brackets to a dictionary of information about the leverage
allowed on each pair
After exectution, self._leverage_brackets = {
"pair_name": [
[notional_floor, maintenenace_margin_ratio, maintenance_amt],
...
],
...
}
e.g. {
"ETH/USDT:USDT": [
[0.0, 0.01, 0.0],
[10000, 0.02, 0.01],
...
],
...
}
"""
if self.trading_mode == TradingMode.FUTURES:
try:
if self._config['dry_run']:
leverage_brackets_path = (
Path(__file__).parent / 'binance_leverage_tiers.json'
)
with open(leverage_brackets_path) as json_file:
leverage_brackets = json.load(json_file)
else:
leverage_brackets = self._api.fetch_leverage_tiers()
for pair, tiers in leverage_brackets.items():
brackets = []
for tier in tiers:
info = tier['info']
brackets.append({
'min': tier['notionalFloor'],
'max': tier['notionalCap'],
'mmr': tier['maintenanceMarginRatio'],
'lev': tier['maxLeverage'],
'maintAmt': float(info['cum']) if 'cum' in info else None,
})
self._leverage_brackets[pair] = brackets
except ccxt.DDoSProtection as e:
raise DDosProtection(e) from e
except (ccxt.NetworkError, ccxt.ExchangeError) as e:
raise TemporaryError(f'Could not fetch leverage amounts due to'
f'{e.__class__.__name__}. Message: {e}') from e
except ccxt.BaseError as e:
raise OperationalException(e) from e
def get_max_leverage(self, pair: str, stake_amount: Optional[float]) -> float:
"""
Returns the maximum leverage that a pair can be traded at
:param pair: The base/quote currency pair being traded
:stake_amount: The total value of the traders margin_mode in quote currency
"""
if self.trading_mode == TradingMode.SPOT:
return 1.0
if self._api.has['fetchLeverageTiers']:
# Checks and edge cases
if stake_amount is None:
raise OperationalException(
'binance.get_max_leverage requires argument stake_amount')
if pair not in self._leverage_brackets: # Not a leveraged market
return 1.0
if stake_amount == 0:
return self._leverage_brackets[pair][0]['lev'] # Max lev for lowest amount
pair_brackets = self._leverage_brackets[pair]
num_brackets = len(pair_brackets)
for bracket_index in range(num_brackets):
bracket = pair_brackets[bracket_index]
lev = bracket['lev']
if bracket_index < num_brackets - 1:
next_bracket = pair_brackets[bracket_index+1]
next_floor = next_bracket['min'] / next_bracket['lev']
if next_floor > stake_amount: # Next bracket min too high for stake amount
return min((bracket['max'] / stake_amount), lev)
#
# With the two leverage brackets below,
# - a stake amount of 150 would mean a max leverage of (10000 / 150) = 66.66
# - stakes below 133.33 = max_lev of 75
# - stakes between 133.33-200 = max_lev of 10000/stake = 50.01-74.99
# - stakes from 200 + 1000 = max_lev of 50
#
# {
# "min": 0, # stake = 0.0
# "max": 10000, # max_stake@75 = 10000/75 = 133.33333333333334
# "lev": 75,
# },
# {
# "min": 10000, # stake = 200.0
# "max": 50000, # max_stake@50 = 50000/50 = 1000.0
# "lev": 50,
# }
#
else: # if on the last bracket
if stake_amount > bracket['max']: # If stake is > than max tradeable amount
raise InvalidOrderException(f'Amount {stake_amount} too high for {pair}')
else:
return bracket['lev']
raise OperationalException(
'Looped through all tiers without finding a max leverage. Should never be reached'
)
else: # Search markets.limits for max lev
market = self.markets[pair]
if market['limits']['leverage']['max'] is not None:
return market['limits']['leverage']['max']
else:
return 1.0 # Default if max leverage cannot be found
@retrier
def _set_leverage(
self,
@ -367,3 +245,16 @@ class Binance(Exchange):
else:
raise OperationalException(
"Freqtrade only supports isolated futures for leverage trading")
def load_leverage_brackets(self) -> Dict[str, List[Dict]]:
if self._config['dry_run']:
leverage_brackets_path = (
Path(__file__).parent / 'binance_leverage_tiers.json'
)
leverage_brackets = {}
with open(leverage_brackets_path) as json_file:
leverage_brackets = json.load(json_file)
return leverage_brackets
else:
leverage_brackets = self._api.fetch_leverage_tiers()
return leverage_brackets

146
freqtrade/exchange/exchange.py
Unescape View File

@ -75,6 +75,7 @@ class Exchange:
"mark_ohlcv_timeframe": "8h",
"ccxt_futures_name": "swap",
"mmr_key": None,
"can_fetch_multiple_tiers": True,
}
_ft_has: Dict = {}
@ -1855,26 +1856,131 @@ class Exchange:
except ccxt.BaseError as e:
raise OperationalException(e) from e
def fill_leverage_brackets(self):
def load_leverage_brackets(self) -> Dict[str, List[Dict]]:
return self._api.fetch_leverage_tiers()
@retrier
def fill_leverage_brackets(self) -> None:
"""
Assigns property _leverage_brackets to a dictionary of information about the leverage
allowed on each pair
Not used if the exchange has a static max leverage value for the account or each pair
After exectution, self._leverage_brackets = {
"pair_name": [
[notional_floor, maintenenace_margin_ratio, maintenance_amt],
...
],
...
}
e.g. {
"ETH/USDT:USDT": [
[0.0, 0.01, 0.0],
[10000, 0.02, 0.01],
...
],
...
}
"""
return
if self._api.has['fetchLeverageTiers']:
if self.trading_mode == TradingMode.FUTURES:
leverage_brackets = self.load_leverage_brackets()
try:
for pair, tiers in leverage_brackets.items():
brackets = []
for tier in tiers:
brackets.append(self.parse_leverage_tier(tier))
self._leverage_brackets[pair] = brackets
except ccxt.DDoSProtection as e:
raise DDosProtection(e) from e
except (ccxt.NetworkError, ccxt.ExchangeError) as e:
raise TemporaryError(f'Could not fetch leverage amounts due to'
f'{e.__class__.__name__}. Message: {e}') from e
except ccxt.BaseError as e:
raise OperationalException(e) from e
def parse_leverage_tier(self, tier) -> Dict:
info = tier['info']
return {
'min': tier['notionalFloor'],
'max': tier['notionalCap'],
'mmr': tier['maintenanceMarginRatio'],
'lev': tier['maxLeverage'],
'maintAmt': float(info['cum']) if 'cum' in info else None,
}
def get_max_leverage(self, pair: str, stake_amount: Optional[float]) -> float:
"""
Returns the maximum leverage that a pair can be traded at
:param pair: The base/quote currency pair being traded
:param nominal_value: The total value of the trade in quote currency (margin_mode + debt)
:stake_amount: The total value of the traders margin_mode in quote currency
"""
market = self.markets[pair]
if market['limits']['leverage']['max'] is not None:
return market['limits']['leverage']['max']
else:
if self.trading_mode == TradingMode.SPOT:
return 1.0
if self._api.has['fetchLeverageTiers']:
# Checks and edge cases
if stake_amount is None:
raise OperationalException(
'binance.get_max_leverage requires argument stake_amount')
if pair not in self._leverage_brackets:
brackets = self.get_leverage_tiers_for_pair(pair)
if not brackets: # Not a leveraged market
return 1.0
else:
self._leverage_brackets[pair] = brackets
if stake_amount == 0:
return self._leverage_brackets[pair][0]['lev'] # Max lev for lowest amount
pair_brackets = self._leverage_brackets[pair]
num_brackets = len(pair_brackets)
for bracket_index in range(num_brackets):
bracket = pair_brackets[bracket_index]
lev = bracket['lev']
if bracket_index < num_brackets - 1:
next_bracket = pair_brackets[bracket_index+1]
next_floor = next_bracket['min'] / next_bracket['lev']
if next_floor > stake_amount: # Next bracket min too high for stake amount
return min((bracket['max'] / stake_amount), lev)
#
# With the two leverage brackets below,
# - a stake amount of 150 would mean a max leverage of (10000 / 150) = 66.66
# - stakes below 133.33 = max_lev of 75
# - stakes between 133.33-200 = max_lev of 10000/stake = 50.01-74.99
# - stakes from 200 + 1000 = max_lev of 50
#
# {
# "min": 0, # stake = 0.0
# "max": 10000, # max_stake@75 = 10000/75 = 133.33333333333334
# "lev": 75,
# },
# {
# "min": 10000, # stake = 200.0
# "max": 50000, # max_stake@50 = 50000/50 = 1000.0
# "lev": 50,
# }
#
else: # if on the last bracket
if stake_amount > bracket['max']: # If stake is > than max tradeable amount
raise InvalidOrderException(f'Amount {stake_amount} too high for {pair}')
else:
return bracket['lev']
raise OperationalException(
'Looped through all tiers without finding a max leverage. Should never be reached'
)
else: # Search markets.limits for max lev
market = self.markets[pair]
if market['limits']['leverage']['max'] is not None:
return market['limits']['leverage']['max']
else:
return 1.0 # Default if max leverage cannot be found
@retrier
def _set_leverage(
self,
@ -2153,11 +2259,17 @@ class Exchange:
raise OperationalException(
"Freqtrade only supports isolated futures for leverage trading")
def get_leverage_tiers(self, pair: str):
def get_leverage_tiers_for_pair(self, pair: str):
# When exchanges can load all their leverage brackets at once in the constructor
# then this method does nothing, it should only be implemented when the leverage
# brackets requires per symbol fetching to avoid excess api calls
return None
if not self._ft_has['can_fetch_multiple_tiers']:
try:
return self._api.fetch_leverage_tiers(pair)
except ccxt.BadRequest:
return None
else:
return None
def get_maintenance_ratio_and_amt(
self,
@ -2177,21 +2289,17 @@ class Exchange:
if self._api.has['fetchLeverageTiers']:
if pair not in self._leverage_brackets:
# Used when fetchLeverageTiers cannot fetch all symbols at once
tiers = self.get_leverage_tiers(pair)
tiers = self.get_leverage_tiers_for_pair(pair)
if not bool(tiers):
raise InvalidOrderException(f"Cannot calculate liquidation price for {pair}")
else:
self._leverage_brackets[pair] = []
for tier in tiers[pair]:
self._leverage_brackets[pair].append((
tier['notionalFloor'],
tier['maintenanceMarginRatio'],
None,
))
self._leverage_brackets[pair].append(self.parse_leverage_tier(tier))
pair_brackets = self._leverage_brackets[pair]
for (notional_floor, mm_ratio, amt) in reversed(pair_brackets):
if nominal_value >= notional_floor:
return (mm_ratio, amt)
for bracket in reversed(pair_brackets):
if nominal_value >= bracket['min']:
return (bracket['mmr'], bracket['maintAmt'])
raise OperationalException("nominal value can not be lower than 0")
# The lowest notional_floor for any pair in fetch_leverage_tiers is always 0 because it
# describes the min amt for a bracket, and the lowest bracket will always go down to 0

4
freqtrade/exchange/okx.py
Unescape View File

@ -19,6 +19,7 @@ class Okx(Exchange):
"ohlcv_candle_limit": 300,
"mark_ohlcv_timeframe": "4h",
"funding_fee_timeframe": "8h",
"can_fetch_multiple_tiers": False,
}
_supported_trading_mode_margin_pairs: List[Tuple[TradingMode, MarginMode]] = [
@ -47,9 +48,6 @@ class Okx(Exchange):
"posSide": "long" if side == "buy" else "short",
})
def get_leverage_tiers(self, pair: str):
return self._api.fetch_leverage_tiers(pair)
def get_max_pair_stake_amount(
self,
pair: str,

6
tests/exchange/test_exchange.py
Unescape View File

@ -3561,8 +3561,10 @@ def test__ccxt_config(
("TKN/USDT", 210.30, 1.0),
])
def test_get_max_leverage(default_conf, mocker, pair, nominal_value, max_lev):
# Binance has a different method of getting the max leverage
exchange = get_patched_exchange(mocker, default_conf, id="kraken")
default_conf['trading_mode'] = 'futures'
default_conf['margin_mode'] = 'isolated'
exchange = get_patched_exchange(mocker, default_conf, id="gateio")
exchange._api.has['fetchLeverageTiers'] = False
assert exchange.get_max_leverage(pair, nominal_value) == max_lev

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