75 lines
2.0 KiB
Python
75 lines
2.0 KiB
Python
# 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
|
|
"""
|
|
session = SessionBase.create_session()
|
|
a = AccountRole.get_address('GAS_GIFTER', session)
|
|
session.close()
|
|
return a
|
|
|
|
|
|
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
|