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

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# standard imports
import logging
# third-party imports
import celery
from cic_registry.chain import ChainSpec
# local imports
from cic_eth.eth import RpcClient
from cic_eth.queue.tx import create as queue_create
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from cic_eth.error import SignerError
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celery_app = celery.current_app
logg = celery_app.log.get_default_logger()
@celery_app.task()
def sign_tx(tx, chain_str):
"""Sign a single transaction against the given chain specification.
:param tx: Transaction in standard Ethereum format
:type tx: dict
:param chain_str: Chain spec string representation
:type chain_str: str
:returns: Transaction hash and raw signed transaction, respectively
:rtype: tuple
"""
chain_spec = ChainSpec.from_chain_str(chain_str)
c = RpcClient(chain_spec)
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tx_transfer_signed = None
try:
tx_transfer_signed = c.w3.eth.sign_transaction(tx)
except FileNotFoundError:
pass
if tx_transfer_signed == None:
raise SignerError('sign tx')
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logg.debug('tx_transfer_signed {}'.format(tx_transfer_signed))
tx_hash = c.w3.keccak(hexstr=tx_transfer_signed['raw'])
tx_hash_hex = tx_hash.hex()
return (tx_hash_hex, tx_transfer_signed['raw'],)
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def sign_and_register_tx(tx, chain_str, queue, cache_task=None, session=None):
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"""Signs the provided transaction, and adds it to the transaction queue cache (with status PENDING).
:param tx: Standard ethereum transaction data
:type tx: dict
:param chain_str: Chain spec, string representation
:type chain_str: str
:param queue: Task queue
:type queue: str
:param cache_task: Cache task to call with signed transaction. If None, no task will be called.
:type cache_task: str
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:raises: sqlalchemy.exc.DatabaseError
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:returns: Tuple; Transaction hash, signed raw transaction data
:rtype: tuple
"""
(tx_hash_hex, tx_signed_raw_hex) = sign_tx(tx, chain_str)
logg.debug('adding queue tx {}'.format(tx_hash_hex))
queue_create(
tx['nonce'],
tx['from'],
tx_hash_hex,
tx_signed_raw_hex,
chain_str,
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session=session,
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)
if cache_task != None:
logg.debug('adding cache task {} tx {}'.format(cache_task, tx_hash_hex))
s_cache = celery.signature(
cache_task,
[
tx_hash_hex,
tx_signed_raw_hex,
chain_str,
],
queue=queue,
)
s_cache.apply_async()
return (tx_hash_hex, tx_signed_raw_hex,)
# TODO: rename as we will not be sending task in the chain, this is the responsibility of the dispatcher
def create_check_gas_and_send_task(tx_signed_raws_hex, chain_str, holder_address, gas, tx_hashes_hex=None, queue=None):
"""Creates a celery task signature for a check_gas task that adds the task to the outgoing queue to be processed by the dispatcher.
If tx_hashes_hex is not spefified, a preceding task chained to check_gas must supply the transaction hashes as its return value.
:param tx_signed_raws_hex: Raw signed transaction data
:type tx_signed_raws_hex: list of str, 0x-hex
:param chain_str: Chain spec, string representation
:type chain_str: str
:param holder_address: Address sending the transactions
:type holder_address: str, 0x-hex
:param gas: Gas budget hint for transactions
:type gas: int
:param tx_hashes_hex: Transaction hashes
:type tx_hashes_hex: list of str, 0x-hex
:param queue: Task queue
:type queue: str
:returns: Signature of task chain
:rtype: celery.Signature
"""
s_check_gas = None
if tx_hashes_hex != None:
s_check_gas = celery.signature(
'cic_eth.eth.tx.check_gas',
[
tx_hashes_hex,
chain_str,
tx_signed_raws_hex,
holder_address,
gas,
],
queue=queue,
)
else:
s_check_gas = celery.signature(
'cic_eth.eth.tx.check_gas',
[
chain_str,
tx_signed_raws_hex,
holder_address,
gas,
],
queue=queue,
)
return s_check_gas