grassrootseconomics/cic-stack
5
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
1a97f1e97d
cic-stack/apps/cic-eth/cic_eth/eth/bancor.py.bak

386 lines
13 KiB
Python
Raw Normal View History

adding cic-eth as sub dir
2021-02-01 18:12:51 +01:00
# standard imports
import os
import logging
# third-party imports
import celery
import web3
from cic_registry import CICRegistry
from cic_registry.chain import ChainSpec
# local imports
from cic_eth.db import SessionBase
from cic_eth.db.models.convert import TxConvertTransfer
from cic_eth.db.models.otx import Otx
from cic_eth.db.models.tx import TxCache
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.token import TokenTxFactory
from cic_eth.eth.factory import TxFactory
from cic_eth.eth.util import unpack_signed_raw_tx
from cic_eth.eth.rpc import RpcClient
celery_app = celery.current_app
#logg = celery_app.log.get_default_logger()
logg = logging.getLogger()
contract_function_signatures = {
'convert': 'f3898a97',
'convert2': '569706eb',
}
class BancorTxFactory(TxFactory):
"""Factory for creating Bancor network transactions.
"""
def convert(
self,
source_token_address,
destination_token_address,
reserve_address,
source_amount,
minimum_return,
chain_spec,
fee_beneficiary='0x0000000000000000000000000000000000000000',
fee_ppm=0,
):
"""Create a BancorNetwork "convert" transaction.
:param source_token_address: ERC20 contract address for token to convert from
:type source_token_address: str, 0x-hex
:param destination_token_address: ERC20 contract address for token to convert to
:type destination_token_address: str, 0x-hex
:param reserve_address: ERC20 contract address of Common reserve token
:type reserve_address: str, 0x-hex
:param source_amount: Amount of source tokens to convert
:type source_amount: int
:param minimum_return: Minimum amount of destination tokens to accept as result for conversion
:type source_amount: int
:return: Unsigned "convert" transaction in standard Ethereum format
:rtype: dict
"""
network_contract = CICRegistry.get_contract(chain_spec, 'BancorNetwork')
network_gas = network_contract.gas('convert')
tx_convert_buildable = network_contract.contract.functions.convert2(
[
source_token_address,
source_token_address,
reserve_address,
destination_token_address,
destination_token_address,
],
source_amount,
minimum_return,
fee_beneficiary,
fee_ppm,
)
tx_convert = tx_convert_buildable.buildTransaction({
'from': self.address,
'gas': network_gas,
'gasPrice': self.gas_price,
'chainId': chain_spec.chain_id(),
'nonce': self.next_nonce(),
})
return tx_convert
def unpack_convert(data):
f = data[2:10]
if f != contract_function_signatures['convert2']:
raise ValueError('Invalid convert data ({})'.format(f))
d = data[10:]
path = d[384:]
source = path[64-40:64]
destination = path[-40:]
amount = int(d[64:128], 16)
min_return = int(d[128:192], 16)
fee_recipient = d[192:256]
fee = int(d[256:320], 16)
return {
'amount': amount,
'min_return': min_return,
'source_token': web3.Web3.toChecksumAddress('0x' + source),
'destination_token': web3.Web3.toChecksumAddress('0x' + destination),
'fee_recipient': fee_recipient,
'fee': fee,
}
# Kept for historical reference, it unpacks a convert call without fee parameters
#def _unpack_convert_mint(data):
# f = data[2:10]
# if f != contract_function_signatures['convert2']:
# raise ValueError('Invalid convert data ({})'.format(f))
#
# d = data[10:]
# path = d[256:]
# source = path[64-40:64]
# destination = path[-40:]
#
# amount = int(d[64:128], 16)
# min_return = int(d[128:192], 16)
# return {
# 'amount': amount,
# 'min_return': min_return,
# 'source_token': web3.Web3.toChecksumAddress('0x' + source),
# 'destination_token': web3.Web3.toChecksumAddress('0x' + destination),
# }
@celery_app.task(bind=True)
def convert_with_default_reserve(self, tokens, from_address, source_amount, minimum_return, to_address, chain_str):
"""Performs a conversion between two liquid tokens using Bancor network.
:param tokens: Token pair, source and destination respectively
:type tokens: list of str, 0x-hex
:param from_address: Ethereum address of sender
:type from_address: str, 0x-hex
:param source_amount: Amount of source tokens to convert
:type source_amount: int
:param minimum_return: Minimum about of destination tokens to receive
:type minimum_return: int
"""
chain_spec = ChainSpec.from_chain_str(chain_str)
queue = self.request.delivery_info['routing_key']
c = RpcClient(chain_spec, holder_address=from_address)
cr = CICRegistry.get_contract(chain_spec, 'BancorNetwork')
source_token = CICRegistry.get_address(chain_spec, tokens[0]['address'])
reserve_address = CICRegistry.get_contract(chain_spec, 'BNTToken', 'ERC20').address()
tx_factory = TokenTxFactory(from_address, c)
tx_approve_zero = tx_factory.approve(source_token.address(), cr.address(), 0, chain_spec)
(tx_approve_zero_hash_hex, tx_approve_zero_signed_hex) = sign_and_register_tx(tx_approve_zero, chain_str, queue, 'cic_eth.eth.token.otx_cache_approve')
tx_approve = tx_factory.approve(source_token.address(), cr.address(), source_amount, chain_spec)
(tx_approve_hash_hex, tx_approve_signed_hex) = sign_and_register_tx(tx_approve, chain_str, queue, 'cic_eth.eth.token.otx_cache_approve')
tx_factory = BancorTxFactory(from_address, c)
tx_convert = tx_factory.convert(
tokens[0]['address'],
tokens[1]['address'],
reserve_address,
source_amount,
minimum_return,
chain_spec,
)
(tx_convert_hash_hex, tx_convert_signed_hex) = sign_and_register_tx(tx_convert, chain_str, queue, 'cic_eth.eth.bancor.otx_cache_convert')
# TODO: consider moving save recipient to async task / chain it before the tx send
if to_address != None:
save_convert_recipient(tx_convert_hash_hex, to_address, chain_str)
s = create_check_gas_and_send_task(
[tx_approve_zero_signed_hex, tx_approve_signed_hex, tx_convert_signed_hex],
chain_str,
from_address,
tx_approve_zero['gasPrice'] * tx_approve_zero['gas'],
tx_hashes_hex=[tx_approve_hash_hex],
queue=queue,
)
s.apply_async()
return tx_convert_hash_hex
#@celery_app.task()
#def process_approval(tx_hash_hex):
# t = session.query(TxConvertTransfer).query(TxConvertTransfer.approve_tx_hash==tx_hash_hex).first()
# c = session.query(Otx).query(Otx.tx_hash==t.convert_tx_hash)
# gas_limit = 8000000
# gas_price = GasOracle.gas_price()
#
# # TODO: use celery group instead
# s_queue = celery.signature(
# 'cic_eth.queue.tx.create',
# [
# nonce,
# c['address'], # TODO: check that this is in fact sender address
# c['tx_hash'],
# c['signed_tx'],
# ]
# )
# s_queue.apply_async()
#
# s_check_gas = celery.signature(
# 'cic_eth.eth.tx.check_gas',
# [
# c['address'],
# [c['signed_tx']],
# gas_limit * gas_price,
# ]
# )
# s_send = celery.signature(
# 'cic_eth.eth.tx.send',
# [],
# )
#
# s_set_sent = celery.signature(
# 'cic_eth.queue.tx.set_sent_status',
# [False],
# )
# s_send.link(s_set_sent)
# s_check_gas.link(s_send)
# s_check_gas.apply_async()
# return tx_hash_hex
@celery_app.task()
def save_convert_recipient(convert_hash, recipient_address, chain_str):
"""Registers the recipient target for a convert-and-transfer operation.
:param convert_hash: Transaction hash of convert operation
:type convert_hash: str, 0x-hex
:param recipient_address: Address of consequtive transfer recipient
:type recipient_address: str, 0x-hex
"""
session = SessionBase.create_session()
t = TxConvertTransfer(convert_hash, recipient_address, chain_str)
session.add(t)
session.commit()
session.close()
@celery_app.task()
def save_convert_transfer(convert_hash, transfer_hash):
"""Registers that the transfer part of a convert-and-transfer operation has been executed.
:param convert_hash: Transaction hash of convert operation
:type convert_hash: str, 0x-hex
:param convert_hash: Transaction hash of transfer operation
:type convert_hash: str, 0x-hex
:returns: transfer_hash,
:rtype: list, single str, 0x-hex
"""
session = SessionBase.create_session()
t = TxConvertTransfer.get(convert_hash)
t.transfer(transfer_hash)
session.add(t)
session.commit()
session.close()
return [transfer_hash]
# TODO: seems unused, consider removing
@celery_app.task()
def resolve_converters_by_tokens(tokens, chain_str):
"""Return converters for a list of tokens.
:param tokens: Token addresses to look up
:type tokens: list of str, 0x-hex
:return: Addresses of matching converters
:rtype: list of str, 0x-hex
"""
chain_spec = ChainSpec.from_chain_str(chain_str)
for t in tokens:
c = CICRegistry.get_contract(chain_spec, 'ConverterRegistry')
fn = c.function('getConvertersByAnchors')
try:
converters = fn([t['address']]).call()
except Exception as e:
raise e
t['converters'] = converters
return tokens
@celery_app.task(bind=True)
def transfer_converted(self, tokens, holder_address, receiver_address, value, tx_convert_hash_hex, chain_str):
"""Execute the ERC20 transfer of a convert-and-transfer operation.
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.
:param tokens: Token addresses
:type tokens: list of str, 0x-hex
:param holder_address: Token holder address
:type holder_address: str, 0x-hex
:param holder_address: Token receiver address
:type holder_address: str, 0x-hex
:param value: Amount of token, in 'wei'
:type value: int
:raises TokenCountError: Either none or more then one tokens have been passed as tokens argument
:return: Transaction hash
: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']
c = RpcClient(chain_spec, holder_address=holder_address)
# get transaction parameters
gas_price = c.gas_price()
tx_factory = TokenTxFactory(holder_address, c)
token_address = tokens[0]['address']
tx_transfer = tx_factory.transfer(
token_address,
receiver_address,
value,
chain_spec,
)
(tx_transfer_hash_hex, tx_transfer_signed_hex) = sign_and_register_tx(tx_transfer, chain_str, queue, 'cic_eth.eth.token.otx_cache_transfer')
# send transaction
logg.info('transfer converted token {} from {} to {} value {} {}'.format(token_address, holder_address, receiver_address, value, tx_transfer_signed_hex))
s = create_check_gas_and_send_task(
[tx_transfer_signed_hex],
chain_str,
holder_address,
tx_transfer['gasPrice'] * tx_transfer['gas'],
None,
queue,
)
s_save = celery.signature(
'cic_eth.eth.bancor.save_convert_transfer',
[
tx_convert_hash_hex,
tx_transfer_hash_hex,
],
queue=queue,
)
s_save.link(s)
s_save.apply_async()
return tx_transfer_hash_hex
@celery_app.task()
def otx_cache_convert(
tx_hash_hex,
tx_signed_raw_hex,
chain_str,
):
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())
tx_data = unpack_convert(tx['data'])
logg.debug('tx data {}'.format(tx_data))
session = TxCache.create_session()
tx_cache = TxCache(
tx_hash_hex,
tx['from'],
tx['from'],
tx_data['source_token'],
tx_data['destination_token'],
tx_data['amount'],
tx_data['amount'],
)
session.add(tx_cache)
session.commit()
session.close()
return tx_hash_hex
Reference in New Issue Copy Permalink