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

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2021-02-01 18:12:51 +01:00
# standard imports
import logging
# third-party imports
import web3
import celery
from cic_registry import CICRegistry
from cic_registry.chain import ChainSpec
from erc20_single_shot_faucet import Faucet
from cic_registry import zero_address
# local import
from cic_eth.eth import RpcClient
from cic_eth.eth import registry_extra_identifiers
from cic_eth.eth.task import sign_and_register_tx
from cic_eth.eth.task import create_check_gas_and_send_task
from cic_eth.eth.factory import TxFactory
from cic_eth.db.models.nonce import Nonce
from cic_eth.db.models.base import SessionBase
from cic_eth.db.models.role import AccountRole
from cic_eth.db.models.tx import TxCache
from cic_eth.eth.util import unpack_signed_raw_tx
from cic_eth.error import RoleMissingError
#logg = logging.getLogger(__name__)
logg = logging.getLogger()
celery_app = celery.current_app
class AccountTxFactory(TxFactory):
"""Factory for creating account index contract transactions
"""
def add(
self,
address,
chain_spec,
):
"""Register an Ethereum account address with the on-chain account registry
:param address: Ethereum account address to add
:type address: str, 0x-hex
:param chain_spec: Chain to build transaction for
:type chain_spec: cic_registry.chain.ChainSpec
:returns: Unsigned "AccountRegistry.add" transaction in standard Ethereum format
:rtype: dict
"""
c = CICRegistry.get_contract(chain_spec, 'AccountRegistry')
f = c.function('add')
tx_add_buildable = f(
address,
)
gas = c.gas('add')
tx_add = tx_add_buildable.buildTransaction({
'from': self.address,
'gas': gas,
'gasPrice': self.gas_price,
'chainId': chain_spec.chain_id(),
'nonce': self.next_nonce(),
'value': 0,
})
return tx_add
def gift(
self,
address,
chain_spec,
):
"""Trigger the on-chain faucet to disburse tokens to the provided Ethereum account
:param address: Ethereum account address to gift to
:type address: str, 0x-hex
:param chain_spec: Chain to build transaction for
:type chain_spec: cic_registry.chain.ChainSpec
:returns: Unsigned "Faucet.giveTo" transaction in standard Ethereum format
:rtype: dict
"""
c = CICRegistry.get_contract(chain_spec, 'Faucet')
f = c.function('giveTo')
tx_add_buildable = f(address)
gas = c.gas('add')
tx_add = tx_add_buildable.buildTransaction({
'from': self.address,
'gas': gas,
'gasPrice': self.gas_price,
'chainId': chain_spec.chain_id(),
'nonce': self.next_nonce(),
'value': 0,
})
return tx_add
def unpack_register(data):
"""Verifies that a transaction is an "AccountRegister.add" transaction, and extracts call parameters from it.
:param data: Raw input data from Ethereum transaction.
:type data: str, 0x-hex
:raises ValueError: Function signature does not match AccountRegister.add
:returns: Parsed parameters
:rtype: dict
"""
f = data[2:10]
if f != '0a3b0a4f':
raise ValueError('Invalid account index register data ({})'.format(f))
d = data[10:]
return {
'to': web3.Web3.toChecksumAddress('0x' + d[64-40:64]),
}
def unpack_gift(data):
"""Verifies that a transaction is a "Faucet.giveTo" transaction, and extracts call parameters from it.
:param data: Raw input data from Ethereum transaction.
:type data: str, 0x-hex
:raises ValueError: Function signature does not match AccountRegister.add
:returns: Parsed parameters
:rtype: dict
"""
f = data[2:10]
if f != '63e4bff4':
raise ValueError('Invalid account index register data ({})'.format(f))
d = data[10:]
return {
'to': web3.Web3.toChecksumAddress('0x' + d[64-40:64]),
}
@celery_app.task()
def create(password, chain_str):
"""Creates and stores a new ethereum account in the keystore.
The password is passed on to the wallet backend, no encryption is performed in the task worker.
:param password: Password to encrypt private key with
:type password: str
:param chain_str: Chain spec string representation
:type chain_str: str
:returns: Ethereum address of newly created account
:rtype: str, 0x-hex
"""
chain_spec = ChainSpec.from_chain_str(chain_str)
c = RpcClient(chain_spec)
a = c.w3.eth.personal.new_account(password)
logg.debug('created account {}'.format(a))
# Initialize nonce provider record for account
n = c.w3.eth.getTransactionCount(a, 'pending')
session = SessionBase.create_session()
o = session.query(Nonce).filter(Nonce.address_hex==a).first()
if o == None:
o = Nonce()
o.address_hex = a
o.nonce = n
session.add(o)
session.commit()
session.close()
return a
@celery_app.task(bind=True, throws=(RoleMissingError,))
def register(self, account_address, chain_str, writer_address=None):
"""Creates a transaction to add the given address to the accounts index.
:param account_address: Ethereum address to add
:type account_address: str, 0x-hex
:param chain_str: Chain spec string representation
:type chain_str: str
:param writer_address: Specify address in keystore to sign transaction. Overrides local accounts role setting.
:type writer_address: str, 0x-hex
:raises RoleMissingError: Writer address not set and writer role not found.
:returns: The account_address input param
:rtype: str, 0x-hex
"""
chain_spec = ChainSpec.from_chain_str(chain_str)
if writer_address == None:
writer_address = AccountRole.get_address('ACCOUNTS_INDEX_WRITER')
if writer_address == zero_address:
raise RoleMissingError(account_address)
logg.debug('adding account address {} to index; writer {}'.format(account_address, writer_address))
queue = self.request.delivery_info['routing_key']
c = RpcClient(chain_spec, holder_address=writer_address)
txf = AccountTxFactory(writer_address, c)
tx_add = txf.add(account_address, chain_spec)
(tx_hash_hex, tx_signed_raw_hex) = sign_and_register_tx(tx_add, chain_str, queue, 'cic_eth.eth.account.cache_account_data')
gas_budget = tx_add['gas'] * tx_add['gasPrice']
logg.debug('register user tx {}'.format(tx_hash_hex))
s = create_check_gas_and_send_task(
[tx_signed_raw_hex],
chain_str,
writer_address,
gas_budget,
tx_hashes_hex=[tx_hash_hex],
queue=queue,
)
s.apply_async()
return account_address
@celery_app.task(bind=True)
def gift(self, account_address, chain_str):
"""Creates a transaction to invoke the faucet contract for the given address.
:param account_address: Ethereum address to give to
:type account_address: str, 0x-hex
:param chain_str: Chain spec string representation
:type chain_str: str
:returns: Raw signed transaction
:rtype: list with transaction as only element
"""
chain_spec = ChainSpec.from_chain_str(chain_str)
logg.debug('gift account address {} to index'.format(account_address))
queue = self.request.delivery_info['routing_key']
c = RpcClient(chain_spec, holder_address=account_address)
txf = AccountTxFactory(account_address, c)
tx_add = txf.gift(account_address, chain_spec)
(tx_hash_hex, tx_signed_raw_hex) = sign_and_register_tx(tx_add, chain_str, queue, 'cic_eth.eth.account.cache_gift_data')
gas_budget = tx_add['gas'] * tx_add['gasPrice']
logg.debug('register user tx {}'.format(tx_hash_hex))
s = create_check_gas_and_send_task(
[tx_signed_raw_hex],
chain_str,
account_address,
gas_budget,
[tx_hash_hex],
queue=queue,
)
s.apply_async()
return [tx_signed_raw_hex]
@celery_app.task(bind=True)
def have(self, account, chain_str):
"""Check whether the given account exists in keystore
:param account: Account to check
:type account: str, 0x-hex
:param chain_str: Chain spec string representation
:type chain_str: str
:returns: Account, or None if not exists
:rtype: Varies
"""
c = RpcClient(account)
try:
c.w3.eth.sign(account, text='2a')
return account
except Exception as e:
logg.debug('cannot sign with {}: {}'.format(account, e))
return None
@celery_app.task(bind=True)
def role(self, account, chain_str):
"""Return account role for address
:param account: Account to check
:type account: str, 0x-hex
:param chain_str: Chain spec string representation
:type chain_str: str
:returns: Account, or None if not exists
:rtype: Varies
"""
return AccountRole.role_for(account)
@celery_app.task()
def cache_gift_data(
tx_hash_hex,
tx_signed_raw_hex,
chain_str,
):
"""Generates and commits transaction cache metadata for a Faucet.giveTo transaction
:param tx_hash_hex: Transaction hash
:type tx_hash_hex: str, 0x-hex
:param tx_signed_raw_hex: Raw signed transaction
:type tx_signed_raw_hex: str, 0x-hex
:param chain_str: Chain spec string representation
:type chain_str: str
:returns: Transaction hash and id of cache element in storage backend, respectively
:rtype: tuple
"""
chain_spec = ChainSpec.from_chain_str(chain_str)
c = RpcClient(chain_spec)
tx_signed_raw_bytes = bytes.fromhex(tx_signed_raw_hex[2:])
tx = unpack_signed_raw_tx(tx_signed_raw_bytes, chain_spec.chain_id())
tx_data = unpack_gift(tx['data'])
session = SessionBase.create_session()
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tx_cache = TxCache(
tx_hash_hex,
tx['from'],
tx['to'],
zero_address,
zero_address,
0,
0,
session=session,
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)
session.add(tx_cache)
session.commit()
cache_id = tx_cache.id
session.close()
return (tx_hash_hex, cache_id)
@celery_app.task()
def cache_account_data(
tx_hash_hex,
tx_signed_raw_hex,
chain_str,
):
"""Generates and commits transaction cache metadata for an AccountsIndex.add transaction
:param tx_hash_hex: Transaction hash
:type tx_hash_hex: str, 0x-hex
:param tx_signed_raw_hex: Raw signed transaction
:type tx_signed_raw_hex: str, 0x-hex
:param chain_str: Chain spec string representation
:type chain_str: str
:returns: Transaction hash and id of cache element in storage backend, respectively
:rtype: tuple
"""
chain_spec = ChainSpec.from_chain_str(chain_str)
c = RpcClient(chain_spec)
tx_signed_raw_bytes = bytes.fromhex(tx_signed_raw_hex[2:])
tx = unpack_signed_raw_tx(tx_signed_raw_bytes, chain_spec.chain_id())
tx_data = unpack_register(tx['data'])
session = SessionBase.create_session()
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tx_cache = TxCache(
tx_hash_hex,
tx['from'],
tx['to'],
zero_address,
zero_address,
0,
0,
session=session,
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)
session.add(tx_cache)
session.commit()
cache_id = tx_cache.id
session.close()
return (tx_hash_hex, cache_id)