def datafeed_fallback_gas_price_strategy(web3: Web3, transaction_params: TxParams = None) -> Wei:
feeds = (GasnowGasPriceDatafeed, EtherchainGasPriceDatafeed, UpvestGasPriceDatafeed)
for gas_price_feed_class in feeds:
try:
gas_strategy = gas_price_feed_class.construct_gas_strategy()
gas_price = gas_strategy(web3, transaction_params)
gas_price = Wei(min(int(gas_price), Web3.toWei(100, 'gwei')))
except Datafeed.DatafeedError:
continue
else:
return gas_price
else:
# Worst-case scenario, we get the price from the ETH node itself
return rpc_gas_price_strategy(web3, transaction_params)
def datafeed_median_gas_price_strategy(web3: Web3,
transaction_params: TxParams = None
) -> Wei:
feeds = (UpvestGasPriceDatafeed, EtherchainGasPriceDatafeed,
ZoltuGasPriceDatafeed)
prices = []
for gas_price_feed_class in feeds:
try:
gas_strategy = gas_price_feed_class.construct_gas_strategy(
speed=speed)
gas_price = gas_strategy(web3, transaction_params)
except Datafeed.DatafeedError:
continue
else:
prices.append(gas_price)
if prices:
median_price = statistics.median(prices)
return median_price
else: # Worst-case scenario, we get the price from the ETH node itself
return rpc_gas_price_strategy(web3, transaction_params)
def datafeed_median_gas_price_strategy(web3: Web3,
transaction_params: TxParams = None
) -> Wei:
feeds = (UpvestGasPriceDatafeed, ZoltuGasPriceDatafeed
) # removed EtherchainGasPriceDatafeed due to EIP-1559
prices = []
for gas_price_feed_class in feeds:
try:
gas_strategy = gas_price_feed_class.construct_gas_strategy(
speed=speed)
gas_price = gas_strategy(web3, transaction_params)
except Exception:
# some problem; onward and upward
continue
else:
prices.append(gas_price)
if prices:
median_price = statistics.median(prices)
return int(median_price) # must return an int
else: # Worst-case scenario, we get the price from the ETH node itself
return rpc_gas_price_strategy(web3, transaction_params)
def test_default_rpc_gas_price_strategy_callable_without_transaction(web3):
assert rpc_gas_price_strategy(web3) == 1
def test_default_rpc_gas_price_strategy(web3):
assert rpc_gas_price_strategy(web3, {'to': '0x0', 'value': 1}) == 1
def test_default_rpc_gas_price_strategy(web3):
assert rpc_gas_price_strategy(web3, {
'to': '0x0',
'value': 1
}) == 1
def test_default_rpc_gas_price_strategy_callable_without_transaction(web3):
assert rpc_gas_price_strategy(web3) == 1