cic-stack/apps/cic-eth/cic_eth/eth/gas.py

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2021-02-01 18:12:51 +01:00
# standard imports
import logging
# local imports
from cic_eth.db.models.role import AccountRole
from cic_eth.db.models.base import SessionBase
logg = logging.getLogger()
class GasOracle():
"""Provides gas pricing for transactions.
:param w3: Web3 object
:type w3: web3.Web3
"""
__safe_threshold_amount_value = 2000000000 * 60000 * 3
__refill_amount_value = __safe_threshold_amount_value * 5
default_gas_limit = 21000
def __init__(self, w3):
self.w3 = w3
self.gas_price_current = w3.eth.gas_price()
def safe_threshold_amount(self):
"""The gas balance threshold under which a new gas refill transaction should be initiated.
:returns: Gas token amount
:rtype: number
"""
g = GasOracle.__safe_threshold_amount_value
logg.warning('gas safe threshold is currently hardcoded to {}'.format(g))
return g
def refill_amount(self):
"""The amount of gas tokens to send in a gas refill transaction.
:returns: Gas token amount
:rtype: number
"""
g = GasOracle.__refill_amount_value
logg.warning('gas refill amount is currently hardcoded to {}'.format(g))
return g
def gas_provider(self):
"""Gas provider address.
:returns: Etheerum account address
:rtype: str, 0x-hex
"""
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session = SessionBase.create_session()
a = AccountRole.get_address('GAS_GIFTER', session)
session.close()
return a
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def gas_price(self, category='safe'):
"""Get projected gas price to use for a transaction at the current moment.
When the category parameter is implemented, it can be used to control the priority of a transaction in the network.
:param category: Bid level category to return price for. Currently has no effect.
:type category: str
:returns: Gas price
:rtype: number
"""
#logg.warning('gas price hardcoded to category "safe"')
#g = 100
#return g
return self.gas_price_current