cic-internal-integration/apps/cic-eth/cic_eth/eth/nonce.py

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# standard imports
import logging
# external imports
import celery
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from chainlib.eth.address import is_checksum_address, is_address
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# local imports
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from cic_eth.db.models.role import AccountRole
from cic_eth.db.models.base import SessionBase
from cic_eth.task import CriticalSQLAlchemyTask
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from cic_eth.db.models.nonce import (
Nonce,
NonceReservation,
)
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celery_app = celery.current_app
logg = logging.getLogger()
class CustodialTaskNonceOracle():
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"""Ensures atomic nonce increments for all transactions across all tasks and threads.
:param address: Address to generate nonces for
:type address: str, 0x-hex
:param default_nonce: Initial nonce value to use if no nonce cache entry already exists
:type default_nonce: number
"""
def __init__(self, address, uuid, session=None):
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self.address = address
self.uuid = uuid
self.session = session
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def get_nonce(self):
return self.next_nonce()
def next_nonce(self):
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"""Get next unique nonce.
:returns: Nonce
:rtype: number
"""
r = NonceReservation.release(self.address, self.uuid, session=self.session)
return r[1]
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@celery_app.task(bind=True, base=CriticalSQLAlchemyTask)
def reserve_nonce(self, chained_input, chain_spec_dict, signer_address=None):
self.log_banner()
session = SessionBase.create_session()
address = None
if signer_address == None:
address = chained_input
logg.debug('non-explicit address for reserve nonce, using arg head {}'.format(chained_input))
else:
if is_checksum_address(signer_address):
address = signer_address
logg.debug('explicit address for reserve nonce {}'.format(signer_address))
else:
address = AccountRole.get_address(signer_address, session=session)
logg.debug('role for reserve nonce {} -> {}'.format(signer_address, address))
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if not is_address(address):
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raise ValueError('invalid result when resolving address for nonce {}'.format(address))
root_id = self.request.root_id
r = NonceReservation.next(address, root_id, session=session)
logg.debug('nonce {} reserved for address {} task {}'.format(r[1], address, r[0]))
session.commit()
session.close()
return chained_input