def _order_tuple(order):
return (order.maker.address, order.taker.address,
order.fee_recipient.address, order.sender.address,
order.pay_amount.value, order.buy_amount.value,
order.maker_fee.value, order.taker_fee.value, order.expiration,
order.salt, hexstring_to_bytes(order.pay_asset.serialize()),
hexstring_to_bytes(order.buy_asset.serialize()))
def write(self, code: str):
assert (isinstance(code, str))
if code.startswith('0x'):
b32_code = hexstring_to_bytes(code)
else:
b32_code = hexstring_to_bytes('0x' + code)
return Transact(self, self.web3, self.abi, self.address,
self._contract, 'write', [b32_code])
def execute(self, code: str, calldata: Calldata) -> Transact:
assert (isinstance(code, str))
assert (isinstance(calldata, Calldata))
if code.startswith('0x'):
b32_code = hexstring_to_bytes(code)
else:
b32_code = hexstring_to_bytes('0x' + code)
return Transact(self, self.web3, self.abi, self.address,
self._contract, 'execute(bytes,bytes)',
[b32_code, calldata.as_bytes()])
def read(self, code: str) -> Optional[Address]:
assert (isinstance(code, str))
if code.startswith('0x'):
b32_code = hexstring_to_bytes(code)
else:
b32_code = hexstring_to_bytes('0x' + code)
address = Address(self._contract.functions.read(b32_code).call())
if address == Address('0x0000000000000000000000000000000000000000'):
return None
else:
return address
def fill_order(self, order: Order, fill_buy_amount: Wad) -> Transact:
"""Fills an order.
Args:
order: The order to be filled.
fill_buy_amount: The amount (in terms of `buy_token` of the original order) to be filled.
Returns:
A :py:class:`pyflex.Transact` instance, which can be used to trigger the transaction.
"""
assert (isinstance(order, Order))
assert (isinstance(fill_buy_amount, Wad))
method_signature = self.web3.keccak(
text=f"fillOrder({self.ORDER_INFO_TYPE},uint256,bytes)")[0:4]
method_parameters = encode_single(
f"({self.ORDER_INFO_TYPE},uint256,bytes)", [
self._order_tuple(order), fill_buy_amount.value,
hexstring_to_bytes(order.signature)
])
request = bytes_to_hexstring(method_signature + method_parameters)
return Transact(self, self.web3, self.abi, self.address,
self._contract, None, [request])
def asset_transfer_proxy(self, proxy_id: str) -> Address:
"""Get the address of the `ERC20Proxy` contract associated with this `Exchange` contract.
Returns:
The address of the `ERC20Proxy` token.
"""
assert (isinstance(proxy_id, str))
return Address(
self._contract.functions.getAssetProxy(
hexstring_to_bytes(proxy_id)).call())
def test_permit_specific_addresses_and_sig(self):
# when
self.ds_guard.permit(src=Address('0x1111111111222222222211111111112222222222'),
dst=Address('0x3333333333444444444433333333334444444444'),
sig=hexstring_to_bytes('0xab121fd7')).transact()
# then
assert self.can_call(src='0x1111111111222222222211111111112222222222',
dst='0x3333333333444444444433333333334444444444',
sig='0xab121fd7')
# and
assert not self.can_call(src='0x3333333333444444444433333333334444444444',
dst='0x1111111111222222222211111111112222222222',
sig='0xab121fd7') # different addresses
assert not self.can_call(src='0x1111111111222222222211111111112222222222',
dst='0x3333333333444444444433333333334444444444',
sig='0xab121fd8') # different sig
def sign_order(self, order: Order) -> Order:
"""Signs an order so it can be submitted to the relayer.
Order will be signed by the `web3.eth.defaultAccount` account.
Args:
order: Order you want to sign.
Returns:
Signed order. Copy of the order passed as a parameter with the `signature` field filled with signature.
"""
assert (isinstance(order, Order))
signature = eth_sign(hexstring_to_bytes(self.get_order_hash(order)),
self.web3)
v, r, s = to_vrs(signature)
signed_order = copy.copy(order)
signed_order.signature = bytes_to_hexstring(bytes([v])) + \
bytes_to_hexstring(r)[2:] + \
bytes_to_hexstring(s)[2:] + \
"03" # EthSign
return signed_order
def can_call(self, src: str, dst: str, sig: str) -> bool:
return self.ds_guard._contract.functions.canCall(src, dst, hexstring_to_bytes(sig)).call()
def test_hexstring_to_bytes():
assert hexstring_to_bytes('0x00') == bytes([0x00])
assert hexstring_to_bytes('0x010203') == bytes([0x01, 0x02, 0x03])
assert hexstring_to_bytes('0xffff') == bytes([0xff, 0xff])