505 lines
16 KiB
Python
505 lines
16 KiB
Python
# standard imports
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import logging
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# third-party imports
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import celery
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import requests
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import web3
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from cic_registry import CICRegistry
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from cic_registry import zero_address
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from cic_registry.chain import ChainSpec
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# platform imports
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from cic_eth.db.models.tx import TxCache
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from cic_eth.db.models.base import SessionBase
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from cic_eth.eth import RpcClient
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from cic_eth.error import TokenCountError, PermanentTxError, OutOfGasError, NotLocalTxError
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from cic_eth.eth.task import sign_and_register_tx
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from cic_eth.eth.task import create_check_gas_and_send_task
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from cic_eth.eth.factory import TxFactory
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from cic_eth.eth.util import unpack_signed_raw_tx
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from cic_eth.ext.address import translate_address
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celery_app = celery.current_app
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logg = logging.getLogger()
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# TODO: fetch from cic-contracts instead when implemented
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contract_function_signatures = {
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'transfer': 'a9059cbb',
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'approve': '095ea7b3',
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'transferfrom': '23b872dd',
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}
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class TokenTxFactory(TxFactory):
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"""Factory for creating ERC20 token transactions.
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"""
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def approve(
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self,
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token_address,
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spender_address,
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amount,
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chain_spec,
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):
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"""Create an ERC20 "approve" transaction
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:param token_address: ERC20 contract address
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:type token_address: str, 0x-hex
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:param spender_address: Address to approve spending for
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:type spender_address: str, 0x-hex
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:param amount: Amount of tokens to approve
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:type amount: int
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:param chain_spec: Chain spec
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:type chain_spec: cic_registry.chain.ChainSpec
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:returns: Unsigned "approve" transaction in standard Ethereum format
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:rtype: dict
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"""
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source_token = CICRegistry.get_address(chain_spec, token_address)
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source_token_contract = source_token.contract
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tx_approve_buildable = source_token_contract.functions.approve(
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spender_address,
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amount,
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)
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source_token_gas = source_token.gas('transfer')
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tx_approve = tx_approve_buildable.buildTransaction({
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'from': self.address,
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'gas': source_token_gas,
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'gasPrice': self.gas_price,
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'chainId': chain_spec.chain_id(),
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'nonce': self.next_nonce(),
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})
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return tx_approve
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def transfer(
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self,
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token_address,
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receiver_address,
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value,
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chain_spec,
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):
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"""Create an ERC20 "transfer" transaction
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:param token_address: ERC20 contract address
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:type token_address: str, 0x-hex
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:param receiver_address: Address to send tokens to
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:type receiver_address: str, 0x-hex
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:param amount: Amount of tokens to send
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:type amount: int
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:param chain_spec: Chain spec
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:type chain_spec: cic_registry.chain.ChainSpec
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:returns: Unsigned "transfer" transaction in standard Ethereum format
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:rtype: dict
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"""
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source_token = CICRegistry.get_address(chain_spec, token_address)
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source_token_contract = source_token.contract
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transfer_buildable = source_token_contract.functions.transfer(
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receiver_address,
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value,
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)
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source_token_gas = source_token.gas('transfer')
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tx_transfer = transfer_buildable.buildTransaction(
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{
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'from': self.address,
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'gas': source_token_gas,
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'gasPrice': self.gas_price,
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'chainId': chain_spec.chain_id(),
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'nonce': self.next_nonce(),
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})
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return tx_transfer
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def unpack_transfer(data):
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"""Verifies that a transaction is an "ERC20.transfer" transaction, and extracts call parameters from it.
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:param data: Raw input data from Ethereum transaction.
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:type data: str, 0x-hex
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:raises ValueError: Function signature does not match AccountRegister.add
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:returns: Parsed parameters
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:rtype: dict
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"""
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f = data[2:10]
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if f != contract_function_signatures['transfer']:
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raise ValueError('Invalid transfer data ({})'.format(f))
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d = data[10:]
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return {
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'to': web3.Web3.toChecksumAddress('0x' + d[64-40:64]),
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'amount': int(d[64:], 16)
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}
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def unpack_transferfrom(data):
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"""Verifies that a transaction is an "ERC20.transferFrom" transaction, and extracts call parameters from it.
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:param data: Raw input data from Ethereum transaction.
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:type data: str, 0x-hex
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:raises ValueError: Function signature does not match AccountRegister.add
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:returns: Parsed parameters
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:rtype: dict
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"""
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f = data[2:10]
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if f != contract_function_signatures['transferfrom']:
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raise ValueError('Invalid transferFrom data ({})'.format(f))
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d = data[10:]
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return {
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'from': web3.Web3.toChecksumAddress('0x' + d[64-40:64]),
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'to': web3.Web3.toChecksumAddress('0x' + d[128-40:128]),
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'amount': int(d[128:], 16)
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}
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def unpack_approve(data):
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"""Verifies that a transaction is an "ERC20.approve" transaction, and extracts call parameters from it.
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:param data: Raw input data from Ethereum transaction.
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:type data: str, 0x-hex
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:raises ValueError: Function signature does not match AccountRegister.add
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:returns: Parsed parameters
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:rtype: dict
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"""
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f = data[2:10]
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if f != contract_function_signatures['approve']:
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raise ValueError('Invalid approval data ({})'.format(f))
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d = data[10:]
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return {
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'to': web3.Web3.toChecksumAddress('0x' + d[64-40:64]),
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'amount': int(d[64:], 16)
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}
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@celery_app.task()
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def balance(tokens, holder_address, chain_str):
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"""Return token balances for a list of tokens for given address
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:param tokens: Token addresses
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:type tokens: list of str, 0x-hex
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:param holder_address: Token holder address
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:type holder_address: str, 0x-hex
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:param chain_str: Chain spec string representation
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:type chain_str: str
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:return: List of balances
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:rtype: list of int
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"""
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#abi = ContractRegistry.abi('ERC20Token')
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chain_spec = ChainSpec.from_chain_str(chain_str)
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c = RpcClient(chain_spec)
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for t in tokens:
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#token = CICRegistry.get_address(t['address'])
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#abi = token.abi()
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#o = c.w3.eth.contract(abi=abi, address=t['address'])
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o = CICRegistry.get_address(chain_spec, t['address']).contract
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b = o.functions.balanceOf(holder_address).call()
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t['balance_network'] = b
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return tokens
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@celery_app.task(bind=True)
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def transfer(self, tokens, holder_address, receiver_address, value, chain_str):
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"""Transfer ERC20 tokens between addresses
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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.
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:raises TokenCountError: Either none or more then one tokens have been passed as tokens argument
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:param tokens: Token addresses
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:type tokens: list of str, 0x-hex
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:param holder_address: Token holder address
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:type holder_address: str, 0x-hex
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:param receiver_address: Token receiver address
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:type receiver_address: str, 0x-hex
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:param value: Amount of token, in 'wei'
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:type value: int
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:param chain_str: Chain spec string representation
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:type chain_str: str
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:raises TokenCountError: More than one token is passed in tokens list
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:return: Transaction hash for tranfer operation
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:rtype: str, 0x-hex
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"""
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# we only allow one token, one transfer
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if len(tokens) != 1:
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raise TokenCountError
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chain_spec = ChainSpec.from_chain_str(chain_str)
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queue = self.request.delivery_info['routing_key']
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# retrieve the token interface
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t = tokens[0]
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c = RpcClient(chain_spec, holder_address=holder_address)
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txf = TokenTxFactory(holder_address, c)
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tx_transfer = txf.transfer(t['address'], receiver_address, value, chain_spec)
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(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')
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gas_budget = tx_transfer['gas'] * tx_transfer['gasPrice']
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s = create_check_gas_and_send_task(
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[tx_signed_raw_hex],
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chain_str,
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holder_address,
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gas_budget,
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[tx_hash_hex],
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queue,
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)
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s.apply_async()
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return tx_hash_hex
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@celery_app.task(bind=True)
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def approve(self, tokens, holder_address, spender_address, value, chain_str):
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"""Approve ERC20 transfer on behalf of holder address
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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.
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:raises TokenCountError: Either none or more then one tokens have been passed as tokens argument
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:param tokens: Token addresses
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:type tokens: list of str, 0x-hex
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:param holder_address: Token holder address
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:type holder_address: str, 0x-hex
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:param receiver_address: Token receiver address
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:type receiver_address: str, 0x-hex
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:param value: Amount of token, in 'wei'
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:type value: int
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:param chain_str: Chain spec string representation
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:type chain_str: str
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:raises TokenCountError: More than one token is passed in tokens list
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:return: Transaction hash for tranfer operation
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:rtype: str, 0x-hex
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"""
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# we only allow one token, one transfer
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if len(tokens) != 1:
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raise TokenCountError
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chain_spec = ChainSpec.from_chain_str(chain_str)
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queue = self.request.delivery_info['routing_key']
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# retrieve the token interface
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t = tokens[0]
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c = RpcClient(chain_spec, holder_address=holder_address)
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txf = TokenTxFactory(holder_address, c)
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tx_transfer = txf.approve(t['address'], spender_address, value, chain_spec)
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(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')
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gas_budget = tx_transfer['gas'] * tx_transfer['gasPrice']
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s = create_check_gas_and_send_task(
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[tx_signed_raw_hex],
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chain_str,
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holder_address,
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gas_budget,
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[tx_hash_hex],
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queue,
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)
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s.apply_async()
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return tx_hash_hex
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@celery_app.task()
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def resolve_tokens_by_symbol(token_symbols, chain_str):
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"""Returns contract addresses of an array of ERC20 token symbols
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:param token_symbols: Token symbols to resolve
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:type token_symbols: list of str
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:param chain_str: Chain spec string representation
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:type chain_str: str
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:return: Respective token contract addresses
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:rtype: list of str, 0x-hex
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"""
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tokens = []
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chain_spec = ChainSpec.from_chain_str(chain_str)
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for token_symbol in token_symbols:
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token = CICRegistry.get_token(chain_spec, token_symbol)
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tokens.append({
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'address': token.address(),
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'converters': [],
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})
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return tokens
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@celery_app.task()
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def otx_cache_transfer(
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tx_hash_hex,
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tx_signed_raw_hex,
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chain_str,
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):
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"""Generates and commits transaction cache metadata for an ERC20.transfer or ERC20.transferFrom transaction
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:param tx_hash_hex: Transaction hash
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:type tx_hash_hex: str, 0x-hex
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:param tx_signed_raw_hex: Raw signed transaction
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:type tx_signed_raw_hex: str, 0x-hex
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:param chain_str: Chain spec string representation
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:type chain_str: str
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:returns: Transaction hash and id of cache element in storage backend, respectively
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:rtype: tuple
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"""
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chain_spec = ChainSpec.from_chain_str(chain_str)
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tx_signed_raw_bytes = bytes.fromhex(tx_signed_raw_hex[2:])
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tx = unpack_signed_raw_tx(tx_signed_raw_bytes, chain_spec.chain_id())
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(txc, cache_id) = cache_transfer_data(tx_hash_hex, tx)
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return txc
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@celery_app.task()
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def cache_transfer_data(
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tx_hash_hex,
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tx,
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):
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"""Helper function for otx_cache_transfer
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:param tx_hash_hex: Transaction hash
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:type tx_hash_hex: str, 0x-hex
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:param tx: Signed raw transaction
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:type tx: str, 0x-hex
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:returns: Transaction hash and id of cache element in storage backend, respectively
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:rtype: tuple
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"""
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tx_data = unpack_transfer(tx['data'])
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logg.debug('tx data {}'.format(tx_data))
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logg.debug('tx {}'.format(tx))
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session = SessionBase.create_session()
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tx_cache = TxCache(
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tx_hash_hex,
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tx['from'],
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tx_data['to'],
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tx['to'],
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tx['to'],
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tx_data['amount'],
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tx_data['amount'],
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)
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session.add(tx_cache)
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session.commit()
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cache_id = tx_cache.id
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session.close()
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return (tx_hash_hex, cache_id)
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@celery_app.task()
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def otx_cache_approve(
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tx_hash_hex,
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tx_signed_raw_hex,
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chain_str,
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):
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"""Generates and commits transaction cache metadata for an ERC20.approve transaction
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:param tx_hash_hex: Transaction hash
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:type tx_hash_hex: str, 0x-hex
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:param tx_signed_raw_hex: Raw signed transaction
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:type tx_signed_raw_hex: str, 0x-hex
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:param chain_str: Chain spec string representation
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:type chain_str: str
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:returns: Transaction hash and id of cache element in storage backend, respectively
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:rtype: tuple
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"""
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chain_spec = ChainSpec.from_chain_str(chain_str)
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tx_signed_raw_bytes = bytes.fromhex(tx_signed_raw_hex[2:])
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tx = unpack_signed_raw_tx(tx_signed_raw_bytes, chain_spec.chain_id())
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(txc, cache_id) = cache_approve_data(tx_hash_hex, tx)
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return txc
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@celery_app.task()
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def cache_approve_data(
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tx_hash_hex,
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tx,
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):
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"""Helper function for otx_cache_approve
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:param tx_hash_hex: Transaction hash
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:type tx_hash_hex: str, 0x-hex
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:param tx: Signed raw transaction
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:type tx: str, 0x-hex
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:returns: Transaction hash and id of cache element in storage backend, respectively
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:rtype: tuple
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"""
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tx_data = unpack_approve(tx['data'])
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logg.debug('tx data {}'.format(tx_data))
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logg.debug('tx {}'.format(tx))
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session = SessionBase.create_session()
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tx_cache = TxCache(
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tx_hash_hex,
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tx['from'],
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tx_data['to'],
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tx['to'],
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tx['to'],
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tx_data['amount'],
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tx_data['amount'],
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)
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session.add(tx_cache)
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session.commit()
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cache_id = tx_cache.id
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session.close()
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return (tx_hash_hex, cache_id)
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class ExtendedTx:
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_default_decimals = 6
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def __init__(self, tx_hash, chain_spec):
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self._chain_spec = chain_spec
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self.chain = str(chain_spec)
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self.hash = tx_hash
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self.sender = None
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self.sender_label = None
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self.recipient = None
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self.recipient_label = None
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self.source_token_value = 0
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self.destination_token_value = 0
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self.source_token = zero_address
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self.destination_token = zero_address
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self.source_token_symbol = ''
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self.destination_token_symbol = ''
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self.source_token_decimals = ExtendedTx._default_decimals
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self.destination_token_decimals = ExtendedTx._default_decimals
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def set_actors(self, sender, recipient, trusted_declarator_addresses=None):
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self.sender = sender
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self.recipient = recipient
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if trusted_declarator_addresses != None:
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self.sender_label = translate_address(sender, trusted_declarator_addresses, self.chain)
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self.recipient_label = translate_address(recipient, trusted_declarator_addresses, self.chain)
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def set_tokens(self, source, source_value, destination=None, destination_value=None):
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if destination == None:
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destination = source
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if destination_value == None:
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destination_value = source_value
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st = CICRegistry.get_address(self._chain_spec, source)
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dt = CICRegistry.get_address(self._chain_spec, destination)
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self.source_token = source
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self.source_token_symbol = st.symbol()
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self.source_token_decimals = st.decimals()
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self.source_token_value = source_value
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self.destination_token = destination
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self.destination_token_symbol = dt.symbol()
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self.destination_token_decimals = dt.decimals()
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self.destination_token_value = destination_value
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def to_dict(self):
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o = {}
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for attr in dir(self):
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if attr[0] == '_' or attr in ['set_actors', 'set_tokens', 'to_dict']:
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continue
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o[attr] = getattr(self, attr)
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return o
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