cic-stack/apps/cic-eth/cic_eth/eth/erc20.py

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# standard imports
import logging
# external imports
import celery
from chainlib.eth.constant import ZERO_ADDRESS
from chainlib.chain import ChainSpec
from chainlib.connection import RPCConnection
from chainlib.eth.tx import (
TxFormat,
unpack,
)
from cic_eth_registry import CICRegistry
from cic_eth_registry.erc20 import ERC20Token
from hexathon import strip_0x
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from chainqueue.db.models.tx import TxCache
from chainqueue.error import NotLocalTxError
from eth_erc20 import ERC20
# local imports
from cic_eth.db.models.base import SessionBase
from cic_eth.db.models.role import AccountRole
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from cic_eth.error import (
TokenCountError,
PermanentTxError,
OutOfGasError,
)
from cic_eth.queue.tx import register_tx
from cic_eth.eth.gas import (
create_check_gas_task,
MaxGasOracle,
)
from cic_eth.ext.address import translate_address
from cic_eth.task import (
CriticalSQLAlchemyTask,
CriticalWeb3Task,
CriticalSQLAlchemyAndSignerTask,
)
from cic_eth.eth.nonce import CustodialTaskNonceOracle
celery_app = celery.current_app
logg = logging.getLogger()
@celery_app.task(base=CriticalWeb3Task)
def balance(tokens, holder_address, chain_spec_dict):
"""Return token balances for a list of tokens for given address
:param tokens: Token addresses
:type tokens: list of str, 0x-hex
:param holder_address: Token holder address
:type holder_address: str, 0x-hex
:param chain_spec_dict: Chain spec string representation
:type chain_spec_dict: str
:return: List of balances
:rtype: list of int
"""
chain_spec = ChainSpec.from_dict(chain_spec_dict)
rpc = RPCConnection.connect(chain_spec, 'default')
caller_address = ERC20Token.caller_address
for t in tokens:
address = t['address']
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token = ERC20Token(chain_spec, rpc, address)
c = ERC20(chain_spec)
o = c.balance_of(address, holder_address, sender_address=caller_address)
r = rpc.do(o)
t['balance_network'] = c.parse_balance(r)
rpc.disconnect()
return tokens
@celery_app.task(bind=True, base=CriticalSQLAlchemyAndSignerTask)
def transfer(self, tokens, holder_address, receiver_address, value, chain_spec_dict):
"""Transfer ERC20 tokens between addresses
First argument is a list of tokens, to enable the task to be chained to the symbol to token address resolver function. However, it accepts only one token as argument.
:raises TokenCountError: Either none or more then one tokens have been passed as tokens argument
:param tokens: Token addresses
:type tokens: list of str, 0x-hex
:param holder_address: Token holder address
:type holder_address: str, 0x-hex
:param receiver_address: Token receiver address
:type receiver_address: str, 0x-hex
:param value: Amount of token, in 'wei'
:type value: int
:param chain_str: Chain spec string representation
:type chain_str: str
:raises TokenCountError: More than one token is passed in tokens list
:return: Transaction hash for tranfer operation
:rtype: str, 0x-hex
"""
# we only allow one token, one transfer
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logg.debug('tokens {}'.format(tokens))
if len(tokens) != 1:
raise TokenCountError
t = tokens[0]
chain_spec = ChainSpec.from_dict(chain_spec_dict)
queue = self.request.delivery_info.get('routing_key')
rpc = RPCConnection.connect(chain_spec, 'default')
rpc_signer = RPCConnection.connect(chain_spec, 'signer')
session = self.create_session()
nonce_oracle = CustodialTaskNonceOracle(holder_address, self.request.root_id, session=session)
gas_oracle = self.create_gas_oracle(rpc, MaxGasOracle.gas)
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c = ERC20(chain_spec, signer=rpc_signer, gas_oracle=gas_oracle, nonce_oracle=nonce_oracle)
try:
(tx_hash_hex, tx_signed_raw_hex) = c.transfer(t['address'], holder_address, receiver_address, value, tx_format=TxFormat.RLP_SIGNED)
except FileNotFoundError as e:
raise SignerError(e)
except ConnectionError as e:
raise SignerError(e)
rpc_signer.disconnect()
rpc.disconnect()
cache_task = 'cic_eth.eth.erc20.cache_transfer_data'
register_tx(tx_hash_hex, tx_signed_raw_hex, chain_spec, queue, cache_task=cache_task, session=session)
session.commit()
session.close()
gas_pair = gas_oracle.get_gas(tx_signed_raw_hex)
gas_budget = gas_pair[0] * gas_pair[1]
logg.debug('transfer tx {} {} {}'.format(tx_hash_hex, queue, gas_budget))
s = create_check_gas_task(
[tx_signed_raw_hex],
chain_spec,
holder_address,
gas_budget,
[tx_hash_hex],
queue,
)
s.apply_async()
return tx_hash_hex
@celery_app.task(bind=True, base=CriticalSQLAlchemyAndSignerTask)
def approve(self, tokens, holder_address, spender_address, value, chain_spec_dict):
"""Approve ERC20 transfer on behalf of holder address
First argument is a list of tokens, to enable the task to be chained to the symbol to token address resolver function. However, it accepts only one token as argument.
:raises TokenCountError: Either none or more then one tokens have been passed as tokens argument
:param tokens: Token addresses
:type tokens: list of str, 0x-hex
:param holder_address: Token holder address
:type holder_address: str, 0x-hex
:param receiver_address: Token receiver address
:type receiver_address: str, 0x-hex
:param value: Amount of token, in 'wei'
:type value: int
:param chain_str: Chain spec string representation
:type chain_str: str
:raises TokenCountError: More than one token is passed in tokens list
:return: Transaction hash for tranfer operation
:rtype: str, 0x-hex
"""
# we only allow one token, one transfer
if len(tokens) != 1:
raise TokenCountError
t = tokens[0]
chain_spec = ChainSpec.from_dict(chain_spec_dict)
queue = self.request.delivery_info.get('routing_key')
rpc = RPCConnection.connect(chain_spec, 'default')
rpc_signer = RPCConnection.connect(chain_spec, 'signer')
session = self.create_session()
nonce_oracle = CustodialTaskNonceOracle(holder_address, self.request.root_id, session=session)
gas_oracle = self.create_gas_oracle(rpc, MaxGasOracle.gas)
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c = ERC20(chain_spec, signer=rpc_signer, gas_oracle=gas_oracle, nonce_oracle=nonce_oracle)
try:
(tx_hash_hex, tx_signed_raw_hex) = c.approve(t['address'], holder_address, spender_address, value, tx_format=TxFormat.RLP_SIGNED)
except FileNotFoundError as e:
raise SignerError(e)
except ConnectionError as e:
raise SignerError(e)
rpc_signer.disconnect()
rpc.disconnect()
cache_task = 'cic_eth.eth.erc20.cache_approve_data'
register_tx(tx_hash_hex, tx_signed_raw_hex, chain_spec, queue, cache_task=cache_task, session=session)
session.commit()
session.close()
gas_pair = gas_oracle.get_gas(tx_signed_raw_hex)
gas_budget = gas_pair[0] * gas_pair[1]
s = create_check_gas_task(
[tx_signed_raw_hex],
chain_spec,
holder_address,
gas_budget,
[tx_hash_hex],
queue,
)
s.apply_async()
return tx_hash_hex
@celery_app.task(bind=True, base=CriticalWeb3Task)
def resolve_tokens_by_symbol(self, token_symbols, chain_spec_dict):
"""Returns contract addresses of an array of ERC20 token symbols
:param token_symbols: Token symbols to resolve
:type token_symbols: list of str
:param chain_str: Chain spec string representation
:type chain_str: str
:return: Respective token contract addresses
:rtype: list of str, 0x-hex
"""
tokens = []
chain_spec = ChainSpec.from_dict(chain_spec_dict)
rpc = RPCConnection.connect(chain_spec, 'default')
registry = CICRegistry(chain_spec, rpc)
session = self.create_session()
sender_address = AccountRole.get_address('DEFAULT', session)
session.close()
for token_symbol in token_symbols:
token_address = registry.by_name(token_symbol, sender_address=sender_address)
logg.debug('token {}'.format(token_address))
tokens.append({
'address': token_address,
'converters': [],
})
rpc.disconnect()
return tokens
@celery_app.task(base=CriticalSQLAlchemyTask)
def cache_transfer_data(
tx_hash_hex,
tx_signed_raw_hex,
chain_spec_dict,
):
"""Helper function for otx_cache_transfer
:param tx_hash_hex: Transaction hash
:type tx_hash_hex: str, 0x-hex
:param tx: Signed raw transaction
:type tx: str, 0x-hex
:returns: Transaction hash and id of cache element in storage backend, respectively
:rtype: tuple
"""
chain_spec = ChainSpec.from_dict(chain_spec_dict)
tx_signed_raw_bytes = bytes.fromhex(strip_0x(tx_signed_raw_hex))
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tx = unpack(tx_signed_raw_bytes, chain_spec)
tx_data = ERC20.parse_transfer_request(tx['data'])
recipient_address = tx_data[0]
token_value = tx_data[1]
session = SessionBase.create_session()
tx_cache = TxCache(
tx_hash_hex,
tx['from'],
recipient_address,
tx['to'],
tx['to'],
token_value,
token_value,
session=session,
)
session.add(tx_cache)
session.commit()
cache_id = tx_cache.id
session.close()
return (tx_hash_hex, cache_id)
@celery_app.task(base=CriticalSQLAlchemyTask)
def cache_approve_data(
tx_hash_hex,
tx_signed_raw_hex,
chain_spec_dict,
):
"""Helper function for otx_cache_approve
:param tx_hash_hex: Transaction hash
:type tx_hash_hex: str, 0x-hex
:param tx: Signed raw transaction
:type tx: str, 0x-hex
:returns: Transaction hash and id of cache element in storage backend, respectively
:rtype: tuple
"""
chain_spec = ChainSpec.from_dict(chain_spec_dict)
tx_signed_raw_bytes = bytes.fromhex(strip_0x(tx_signed_raw_hex))
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tx = unpack(tx_signed_raw_bytes, chain_spec)
tx_data = ERC20.parse_approve_request(tx['data'])
recipient_address = tx_data[0]
token_value = tx_data[1]
session = SessionBase.create_session()
tx_cache = TxCache(
tx_hash_hex,
tx['from'],
recipient_address,
tx['to'],
tx['to'],
token_value,
token_value,
session=session,
)
session.add(tx_cache)
session.commit()
cache_id = tx_cache.id
session.close()
return (tx_hash_hex, cache_id)