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

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2021-02-01 18:12:51 +01:00
# standard imports
import logging
# third-party imports
import celery
import requests
import web3
from cic_registry import CICRegistry
from cic_registry.chain import ChainSpec
# platform imports
from cic_eth.db.models.tx import TxCache
from cic_eth.db.models.base import SessionBase
from cic_eth.eth import RpcClient
from cic_eth.error import TokenCountError, PermanentTxError, OutOfGasError, NotLocalTxError
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.eth.util import unpack_signed_raw_tx
celery_app = celery.current_app
logg = logging.getLogger()
# TODO: fetch from cic-contracts instead when implemented
contract_function_signatures = {
'transfer': 'a9059cbb',
'approve': '095ea7b3',
'transferfrom': '23b872dd',
}
class TokenTxFactory(TxFactory):
"""Factory for creating ERC20 token transactions.
"""
def approve(
self,
token_address,
spender_address,
amount,
chain_spec,
):
"""Create an ERC20 "approve" transaction
:param token_address: ERC20 contract address
:type token_address: str, 0x-hex
:param spender_address: Address to approve spending for
:type spender_address: str, 0x-hex
:param amount: Amount of tokens to approve
:type amount: int
:param chain_spec: Chain spec
:type chain_spec: cic_registry.chain.ChainSpec
:returns: Unsigned "approve" transaction in standard Ethereum format
:rtype: dict
"""
source_token = CICRegistry.get_address(chain_spec, token_address)
source_token_contract = source_token.contract
tx_approve_buildable = source_token_contract.functions.approve(
spender_address,
amount,
)
source_token_gas = source_token.gas('transfer')
tx_approve = tx_approve_buildable.buildTransaction({
'from': self.address,
'gas': source_token_gas,
'gasPrice': self.gas_price,
'chainId': chain_spec.chain_id(),
'nonce': self.next_nonce(),
})
return tx_approve
def transfer(
self,
token_address,
receiver_address,
value,
chain_spec,
):
"""Create an ERC20 "transfer" transaction
:param token_address: ERC20 contract address
:type token_address: str, 0x-hex
:param receiver_address: Address to send tokens to
:type receiver_address: str, 0x-hex
:param amount: Amount of tokens to send
:type amount: int
:param chain_spec: Chain spec
:type chain_spec: cic_registry.chain.ChainSpec
:returns: Unsigned "transfer" transaction in standard Ethereum format
:rtype: dict
"""
source_token = CICRegistry.get_address(chain_spec, token_address)
source_token_contract = source_token.contract
transfer_buildable = source_token_contract.functions.transfer(
receiver_address,
value,
)
source_token_gas = source_token.gas('transfer')
tx_transfer = transfer_buildable.buildTransaction(
{
'from': self.address,
'gas': source_token_gas,
'gasPrice': self.gas_price,
'chainId': chain_spec.chain_id(),
'nonce': self.next_nonce(),
})
return tx_transfer
def unpack_transfer(data):
"""Verifies that a transaction is an "ERC20.transfer" 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 != contract_function_signatures['transfer']:
raise ValueError('Invalid transfer data ({})'.format(f))
d = data[10:]
return {
'to': web3.Web3.toChecksumAddress('0x' + d[64-40:64]),
'amount': int(d[64:], 16)
}
def unpack_transferfrom(data):
"""Verifies that a transaction is an "ERC20.transferFrom" 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 != contract_function_signatures['transferfrom']:
raise ValueError('Invalid transferFrom data ({})'.format(f))
d = data[10:]
return {
'from': web3.Web3.toChecksumAddress('0x' + d[64-40:64]),
'to': web3.Web3.toChecksumAddress('0x' + d[128-40:128]),
'amount': int(d[128:], 16)
}
def unpack_approve(data):
"""Verifies that a transaction is an "ERC20.approve" 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 != contract_function_signatures['approve']:
raise ValueError('Invalid approval data ({})'.format(f))
d = data[10:]
return {
'to': web3.Web3.toChecksumAddress('0x' + d[64-40:64]),
'amount': int(d[64:], 16)
}
@celery_app.task()
def balance(tokens, holder_address, chain_str):
"""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_str: Chain spec string representation
:type chain_str: str
:return: List of balances
:rtype: list of int
"""
#abi = ContractRegistry.abi('ERC20Token')
chain_spec = ChainSpec.from_chain_str(chain_str)
balances = []
c = RpcClient(chain_spec)
for t in tokens:
#token = CICRegistry.get_address(t['address'])
#abi = token.abi()
#o = c.w3.eth.contract(abi=abi, address=t['address'])
o = CICRegistry.get_address(chain_spec, t['address']).contract
b = o.functions.balanceOf(holder_address).call()
logg.debug('balance {} for {}: {}'.format(t['address'], holder_address, b))
balances.append(b)
return b
@celery_app.task(bind=True)
def transfer(self, tokens, holder_address, receiver_address, value, chain_str):
"""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
if len(tokens) != 1:
raise TokenCountError
chain_spec = ChainSpec.from_chain_str(chain_str)
queue = self.request.delivery_info['routing_key']
# retrieve the token interface
t = tokens[0]
c = RpcClient(chain_spec, holder_address=holder_address)
txf = TokenTxFactory(holder_address, c)
tx_transfer = txf.transfer(t['address'], receiver_address, value, chain_spec)
(tx_hash_hex, tx_signed_raw_hex) = sign_and_register_tx(tx_transfer, chain_str, queue, cache_task='cic_eth.eth.token.otx_cache_transfer')
gas_budget = tx_transfer['gas'] * tx_transfer['gasPrice']
s = create_check_gas_and_send_task(
[tx_signed_raw_hex],
chain_str,
holder_address,
gas_budget,
[tx_hash_hex],
queue,
)
s.apply_async()
return tx_hash_hex
@celery_app.task(bind=True)
def approve(self, tokens, holder_address, spender_address, value, chain_str):
"""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
chain_spec = ChainSpec.from_chain_str(chain_str)
queue = self.request.delivery_info['routing_key']
# retrieve the token interface
t = tokens[0]
c = RpcClient(chain_spec, holder_address=holder_address)
txf = TokenTxFactory(holder_address, c)
tx_transfer = txf.approve(t['address'], spender_address, value, chain_spec)
(tx_hash_hex, tx_signed_raw_hex) = sign_and_register_tx(tx_transfer, chain_str, queue, cache_task='cic_eth.eth.token.otx_cache_approve')
gas_budget = tx_transfer['gas'] * tx_transfer['gasPrice']
s = create_check_gas_and_send_task(
[tx_signed_raw_hex],
chain_str,
holder_address,
gas_budget,
[tx_hash_hex],
queue,
)
s.apply_async()
return tx_hash_hex
@celery_app.task()
def resolve_tokens_by_symbol(token_symbols, chain_str):
"""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_chain_str(chain_str)
for token_symbol in token_symbols:
token = CICRegistry.get_token(chain_spec, token_symbol)
tokens.append({
'address': token.address(),
#'converters': [],
})
return tokens
@celery_app.task()
def otx_cache_transfer(
tx_hash_hex,
tx_signed_raw_hex,
chain_str,
):
"""Generates and commits transaction cache metadata for an ERC20.transfer or ERC20.transferFrom 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)
tx_signed_raw_bytes = bytes.fromhex(tx_signed_raw_hex[2:])
tx = unpack_signed_raw_tx(tx_signed_raw_bytes, chain_spec.chain_id())
(txc, cache_id) = cache_transfer_data(tx_hash_hex, tx)
return txc
@celery_app.task()
def cache_transfer_data(
tx_hash_hex,
tx,
):
"""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
"""
tx_data = unpack_transfer(tx['data'])
logg.debug('tx data {}'.format(tx_data))
logg.debug('tx {}'.format(tx))
session = SessionBase.create_session()
tx_cache = TxCache(
tx_hash_hex,
tx['from'],
tx_data['to'],
tx['to'],
tx['to'],
tx_data['amount'],
tx_data['amount'],
)
session.add(tx_cache)
session.commit()
cache_id = tx_cache.id
session.close()
return (tx_hash_hex, cache_id)
@celery_app.task()
def otx_cache_approve(
tx_hash_hex,
tx_signed_raw_hex,
chain_str,
):
"""Generates and commits transaction cache metadata for an ERC20.approve 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)
tx_signed_raw_bytes = bytes.fromhex(tx_signed_raw_hex[2:])
tx = unpack_signed_raw_tx(tx_signed_raw_bytes, chain_spec.chain_id())
(txc, cache_id) = cache_approve_data(tx_hash_hex, tx)
return txc
@celery_app.task()
def cache_approve_data(
tx_hash_hex,
tx,
):
"""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
"""
tx_data = unpack_approve(tx['data'])
logg.debug('tx data {}'.format(tx_data))
logg.debug('tx {}'.format(tx))
session = SessionBase.create_session()
tx_cache = TxCache(
tx_hash_hex,
tx['from'],
tx_data['to'],
tx['to'],
tx['to'],
tx_data['amount'],
tx_data['amount'],
)
session.add(tx_cache)
session.commit()
cache_id = tx_cache.id
session.close()
return (tx_hash_hex, cache_id)