class DynamicGasPrice(GasPrice):
GWEI = 1000000000
def __init__(self, arguments):
self.gas_station = None
self.fixed_gas = None
if arguments.ethgasstation_api_key:
self.gas_station = EthGasStation(
refresh_interval=60,
expiry=600,
api_key=arguments.ethgasstation_api_key)
elif arguments.etherchain_gas:
self.gas_station = EtherchainOrg(refresh_interval=60, expiry=600)
elif arguments.poanetwork_gas:
self.gas_station = POANetwork(refresh_interval=60,
expiry=600,
alt_url=arguments.poanetwork_url)
elif arguments.fixed_gas_price:
self.fixed_gas = int(round(arguments.fixed_gas_price * self.GWEI))
self.initial_multiplier = arguments.gas_initial_multiplier
self.reactive_multiplier = arguments.gas_reactive_multiplier
self.gas_maximum = int(round(arguments.gas_maximum * self.GWEI))
if self.fixed_gas:
assert self.fixed_gas <= self.gas_maximum
def get_gas_price(self, time_elapsed: int) -> Optional[int]:
# start with fast price from the configured gas API
fast_price = self.gas_station.fast_price(
) if self.gas_station else None
# if API produces no price, or remote feed not configured, start with a fixed price
if fast_price is None:
initial_price = self.fixed_gas if self.fixed_gas else 10 * self.GWEI
# otherwise, use the API's fast price, adjusted by a coefficient, as our starting point
else:
initial_price = int(round(fast_price * self.initial_multiplier))
return GeometricGasPrice(
initial_price=initial_price,
every_secs=30,
coefficient=self.reactive_multiplier,
max_price=self.gas_maximum).get_gas_price(time_elapsed)
def __str__(self):
retval = ""
if self.gas_station:
retval = f"{type(self.gas_station)} fast gas price with initial multiplier {self.initial_multiplier} "
elif self.fixed_gas:
retval = f"Fixed gas price {round(self.fixed_gas / self.GWEI, 1)} Gwei "
else:
retval = f"Default gas 10 Gwei "
retval += f"and will multiply by {self.reactive_multiplier} every 30s to a maximum of " \
f"{round(self.gas_maximum / self.GWEI, 1)} Gwei"
return retval
def __repr__(self):
return f"DynamicGasPrice({pformat(vars(self))})"
class DynamicGasPrice(GasPrice):
GWEI = 1000000000
def __init__(self, arguments):
self.gas_station = None
if arguments.ethgasstation_api_key:
self.gas_station = EthGasStation(
refresh_interval=60,
expiry=600,
api_key=arguments.ethgasstation_api_key)
elif arguments.etherchain_gas:
self.gas_station = EtherchainOrg(refresh_interval=60, expiry=600)
elif arguments.poanetwork_gas:
self.gas_station = POANetwork(refresh_interval=60,
expiry=600,
alt_url=arguments.poanetwork_url)
def get_gas_price(self, time_elapsed: int) -> Optional[int]:
# start with standard price plus backup in case gas price API is down, then do fast
if 0 <= time_elapsed <= 60:
standard_price = self.gas_station.standard_price(
) if self.gas_station else None
if standard_price is not None:
return int(standard_price * 1.1)
else:
return self.default_gas_pricing(time_elapsed)
# move to fast after a minute
else:
fast_price = self.gas_station.fast_price(
) if self.gas_station else None
if fast_price is not None:
return int(fast_price * 1.1)
else:
return self.default_gas_pricing(time_elapsed)
# default gas pricing when EthGasStation feed is down
def default_gas_pricing(self, time_elapsed: int):
return IncreasingGasPrice(initial_price=5 * self.GWEI,
increase_by=10 * self.GWEI,
every_secs=60,
max_price=100 *
self.GWEI).get_gas_price(time_elapsed)
def test_poanetwork_integration():
logging.basicConfig(format='%(asctime)-15s %(levelname)-8s %(message)s', level=logging.DEBUG)
logging.getLogger('urllib3.connectionpool').setLevel(logging.INFO)
logging.getLogger('requests.packages.urllib3.connectionpool').setLevel(logging.INFO)
poa = POANetwork(10, 600)
while True:
safe_low_price = poa.safe_low_price()
logging.info(safe_low_price)
standard_price = poa.standard_price()
logging.info(standard_price)
fast_price = poa.fast_price()
logging.info(fast_price)
if safe_low_price is not None and standard_price is not None and fast_price is not None:
break
time.sleep(1)