def estimate_fee(exchange: str, is_maker: bool) -> TradeFee:
"""
Estimate the fee of a transaction on any blockchain.
exchange is the name of the exchange to query.
is_maker if true look at fee from maker side, otherwise from taker side.
"""
if exchange not in CONNECTOR_SETTINGS:
raise Exception(
f"Invalid connector. {exchange} does not exist in CONNECTOR_SETTINGS"
)
fee_type = CONNECTOR_SETTINGS[exchange].fee_type
fee_token = CONNECTOR_SETTINGS[exchange].fee_token
default_fees = CONNECTOR_SETTINGS[exchange].default_fees
fee_side = "maker" if is_maker else "taker"
override_key = f"{exchange}_{fee_side}"
if fee_type is TradeFeeType.FlatFee:
override_key += "_fee_amount"
elif fee_type is TradeFeeType.Percent:
override_key += "_fee"
fee = default_fees[0] if is_maker else default_fees[1]
fee_config = fee_overrides_config_map.get(override_key)
if fee_config is not None and fee_config.value is not None:
fee = fee_config.value
fee = Decimal(str(fee))
if fee_type is TradeFeeType.Percent:
return TradeFee(percent=fee / Decimal("100"), flat_fees=[])
elif fee_type is TradeFeeType.FlatFee:
return TradeFee(percent=0, flat_fees=[(fee_token, fee)])
def estimate_fee(exchange: str, is_maker: bool) -> TradeFee:
if exchange not in CONNECTOR_SETTINGS:
raise Exception(f"Invalid connector. {exchange} does not exist in CONNECTOR_SETTINGS")
use_gas = CONNECTOR_SETTINGS[exchange].use_eth_gas_lookup
if use_gas:
gas_amount = get_gas_price(in_gwei=False) * CONNECTOR_SETTINGS[exchange].gas_limit
return TradeFee(percent=0, flat_fees=[("ETH", gas_amount)])
fee_type = CONNECTOR_SETTINGS[exchange].fee_type
fee_token = CONNECTOR_SETTINGS[exchange].fee_token
default_fees = CONNECTOR_SETTINGS[exchange].default_fees
fee_side = "maker" if is_maker else "taker"
override_key = f"{exchange}_{fee_side}"
if fee_type is TradeFeeType.FlatFee:
override_key += "_fee_amount"
elif fee_type is TradeFeeType.Percent:
override_key += "_fee"
fee = default_fees[0] if is_maker else default_fees[1]
fee_config = fee_overrides_config_map.get(override_key)
if fee_config is not None and fee_config.value is not None:
fee = fee_config.value
fee = Decimal(str(fee))
if fee_type is TradeFeeType.Percent:
return TradeFee(percent=fee / Decimal("100"), flat_fees=[])
elif fee_type is TradeFeeType.FlatFee:
return TradeFee(percent=0, flat_fees=[(fee_token, fee)])
def _superimpose_overrides(cls, exchange: str,
trade_fee_schema: TradeFeeSchema):
trade_fee_schema.percent_fee_token = (
fee_overrides_config_map.get(f"{exchange}_percent_fee_token").value
or trade_fee_schema.percent_fee_token)
trade_fee_schema.maker_percent_fee_decimal = (
fee_overrides_config_map.get(f"{exchange}_maker_percent_fee").value
/ Decimal("100") if
fee_overrides_config_map.get(f"{exchange}_maker_percent_fee").value
is not None else trade_fee_schema.maker_percent_fee_decimal)
trade_fee_schema.taker_percent_fee_decimal = (
fee_overrides_config_map.get(f"{exchange}_taker_percent_fee").value
/ Decimal("100") if
fee_overrides_config_map.get(f"{exchange}_taker_percent_fee").value
is not None else trade_fee_schema.taker_percent_fee_decimal)
trade_fee_schema.buy_percent_fee_deducted_from_returns = (
fee_overrides_config_map.get(
f"{exchange}_buy_percent_fee_deducted_from_returns").value
if fee_overrides_config_map.get(
f"{exchange}_buy_percent_fee_deducted_from_returns").value
is not None else
trade_fee_schema.buy_percent_fee_deducted_from_returns)
trade_fee_schema.maker_fixed_fees = (
fee_overrides_config_map.get(f"{exchange}_maker_fixed_fees").value
or trade_fee_schema.maker_fixed_fees)
trade_fee_schema.maker_fixed_fees = [
TokenAmount(*maker_fixed_fee)
for maker_fixed_fee in trade_fee_schema.maker_fixed_fees
]
trade_fee_schema.taker_fixed_fees = (
fee_overrides_config_map.get(f"{exchange}_taker_fixed_fees").value
or trade_fee_schema.taker_fixed_fees)
trade_fee_schema.taker_fixed_fees = [
TokenAmount(*taker_fixed_fee)
for taker_fixed_fee in trade_fee_schema.taker_fixed_fees
]
trade_fee_schema.validate_schema()
return trade_fee_schema