"""Uniswap v2 and compatible DEX deployments.
Compatible exchanges include, but not limited to
- Uniswap v2
- Sushiswap v2
- Pancakeswap v2 and v3
- QuickSwap
- TraderJoe
Under the hood we are using `SushiSwap v2 contracts <github.com/sushiswap/sushiswap>`_ for the deployment.
"""
from dataclasses import dataclass
from typing import Optional, Union, Tuple, Type
from eth_typing import HexAddress, HexStr, ChecksumAddress
from web3 import Web3
from web3.contract import Contract
from eth_defi.abi import get_contract, get_deployed_contract
from eth_defi.deploy import deploy_contract
from eth_defi.revert_reason import fetch_transaction_revert_reason
#: A constant to tell the trade won't expire
from eth_defi.uniswap_v2.utils import pair_for, sort_tokens
from web3.exceptions import ContractLogicError
from eth_defi.utils import ZERO_ADDRESS_STR
FOREVER_DEADLINE = 2**63
#: A constant to tell we do not know or care about pair init code hash for this Uni v2 deploymeny
INIT_CODE_HASH_MISSING = "0x01"
[docs]@dataclass(frozen=True, slots=True)
class UniswapV2Deployment:
"""Uniswap v2 deployment description.
- Data for a deployment fetched from live chain based on factory address and other factors
- Test deployment through :py:func:`eth_defi.uniswap_v2.deployment.deploy_uniswap_v2_like`.
"""
#: The Web3 instance for which the instances of this class are bound
web3: Web3
#: Factory address.
#: Factory deploys new pair contracts and defines the exchange instance on a blockchain.
#: `See the Solidity source code <https://github.com/sushiswap/sushiswap/blob/4fdfeb7dafe852e738c56f11a6cae855e2fc0046/contracts/uniswapv2/UniswapV2Factory.sol>`__.
factory: Contract
#: WETH/WBNB etc. wrapper contract address.
#: `See the Solidity source code <https://github.com/sushiswap/sushiswap/blob/4fdfeb7dafe852e738c56f11a6cae855e2fc0046/contracts/mocks/WETH9Mock.sol>`__.
#:
#: If the router contract ABI has renamed this variable from WETH to something else,
#: e.g. Trader Joe, this is left empty.
#:
#: TDOO: Allow to provision the exchange with different router ABI files.
#:
weth: Optional[Contract]
#: Router address.
#: New routers can be deployed to optimise trade routing and price impact.
#: `See the Solidity source code <https://github.com/sushiswap/sushiswap/blob/4fdfeb7dafe852e738c56f11a6cae855e2fc0046/contracts/uniswapv2/UniswapV2Router02.sol>`__.
router: Contract
#: The hash of deployed pair contract code.
#: Needed to derive new pair contract addresses.
#: `See here for more details <https://github.com/Uniswap/v2-core/issues/102>`_.
init_code_hash: HexStr
#: Pair contract.
#: Holds the token0 and token1 side of the liquidity pool.
#: Executes actual trades.
#: Mints/burns new liquidity provider (LP) tokens.
#: See `UniswapV2Pair` smartc contract for details.
PairContract: Type[Contract]
def __repr__(self):
return f"<Uni v2 deployment chain:{self.web3.eth.chain_id} factory:{self.factory.address} router:{self.router.address}>"
[docs] def pair_for(self, token_a: str, token_b: str) -> Tuple[ChecksumAddress, HexAddress, HexAddress]:
"""Calculate CREATE2 contract address for a trading pair."""
(token0, token1) = sort_tokens(token_a, token_b)
return (Web3.to_checksum_address(pair_for(self.factory.address, token0, token1, self.init_code_hash)), token0, token1)
[docs] def get_pair_contract(self, token_a: str, token_b: str) -> Contract:
"""Get a contract for a trading pair."""
pair_address, sorted_1, sorted_2 = self.pair_for(token_a, token_b)
return self.PairContract(pair_address)
[docs]def deploy_factory_sushi(web3: Web3, deployer: str) -> Contract:
"""Deploy a Uniswap V2 factory contract.
This deployment has to be the init code hash hard coded in `UniswapV2Library.sol`.
We specifically deploy a hash compatible Sushiv2Factory. This makes
the Uniswap deployment non-recompilable, as the source code files refer to the hashes
of a certain compilation version.
We create a bytecode hash identical deployment by **replaying** the transaction that
deployed `Sushiv2Factory` contract.
- `Uniswap v2 issue <https://github.com/Uniswap/v2-core/issues/102>`_
- `See the hash <https://dev.sushi.com/sushiswap/contracts#sushiv2factory>`_.
- `See the contract <https://etherscan.io/address/0xC0AEe478e3658e2610c5F7A4A2E1777cE9e4f2Ac#code>`_.
:param web3: Web3 instance
:param deployer: Deployer adresss
:return: Factory contract instance
"""
UniswapV2Factory = get_contract(web3, "sushi/UniswapV2Factory.json", bytecode=_SUSHI_FACTORY_BYTECODE)
# https://ethereum.stackexchange.com/a/73872/620
tx_hash = web3.eth.send_transaction({"from": deployer, "data": _SUSHI_FACTORY_DEPLOYMENT_DATA})
tx_receipt = web3.eth.wait_for_transaction_receipt(tx_hash)
instance = UniswapV2Factory(address=tx_receipt["contractAddress"])
return instance
[docs]def deploy_uniswap_v2_like(web3: Web3, deployer: str, give_weth=10_000, init_code_hash=None) -> UniswapV2Deployment:
"""Deploy v2=
`See this StackOverflow question for commentary <https://stackoverflow.com/q/70846489/315168>`_.
Example:
.. code-block:: python
deployment = deploy_uniswap_v2_like(web3, deployer)
factory = deployment.factory
print(f"Uniswap factory is {factory.address}")
:param web3: Web3 instance
:param deployer: Deployer account
:param init_code_hash: The factory code hash needed to derive pair addresses. If None use Sushiswap default.
:param give_weth:
Automatically give some Wrapped ETH to the deployer.
Express as ETH units.
:return: Deployment details
"""
if init_code_hash is None:
init_code_hash = _SUSHI_V2_INIT_CODE_HASH
# Factory takes feeSetter as an argument
factory = deploy_factory_sushi(web3, deployer)
weth = deploy_contract(web3, "sushi/WETH9Mock.json", deployer)
router = deploy_contract(web3, "sushi/UniswapV2Router02.json", deployer, factory.address, weth.address)
if give_weth:
weth.functions.deposit().transact({"from": deployer, "value": give_weth * 10**18})
PairContract = get_contract(web3, "sushi/UniswapV2Pair.json")
return UniswapV2Deployment(web3, factory, weth, router, init_code_hash, PairContract)
[docs]def deploy_trading_pair(
web3: Web3,
deployer: str,
deployment: UniswapV2Deployment,
token_a: Contract,
token_b: Contract,
liquidity_a: int,
liquidity_b: int,
) -> HexAddress:
"""Deploy a new trading pair on Uniswap v2.
Assumes `deployer` has enough token balance to add the initial liquidity.
The deployer will also receive LP tokens for newly added liquidity.
`See UniswapV2Factory.createPair() for details <https://github.com/sushiswap/sushiswap/blob/4fdfeb7dafe852e738c56f11a6cae855e2fc0046/contracts/uniswapv2/UniswapV2Factory.sol#L30>`_.
:param web3: Web3 instance
:param deployer: Deployer account
:param deployment: Uniswap v2 deployment
:param token_a: Base token of the trading pair
:param token_b: Quote token of the trading pair
:param liquidity_a: Initial liquidity added for `token_a`. Set zero if no liquidity will be added.
:param liquidity_b: Initial liquidity added for `token_b`. Set zero if no liquidity will be added.
:return: Pair contract address
"""
assert isinstance(token_a, Contract)
assert isinstance(token_b, Contract)
assert token_a.address != token_b.address
if int(token_a.address, 16) > int(token_b.address, 16):
# Swap around to satisfy Uni v2 address sort criteria
token_a, token_b = token_b, token_a
liquidity_a, liquidity_b = liquidity_b, liquidity_a
assert int(token_a.address, 16) < int(token_b.address, 16), "Uniswap v2 pairs must be always expressed in the ascending sorted order of their addresses"
factory = deployment.factory
pair = factory.functions.getPair(token_a.address, token_b.address).call()
assert pair == ZERO_ADDRESS_STR, "Already deployed"
# https://github.com/sushiswap/sushiswap/blob/4fdfeb7dafe852e738c56f11a6cae855e2fc0046/contracts/uniswapv2/UniswapV2Factory.sol#L30
gas_limit = 2_500_000
tx_hash = factory.functions.createPair(token_a.address, token_b.address).transact({"from": deployer, "gas": gas_limit})
tx_receipt = web3.eth.wait_for_transaction_receipt(tx_hash)
if tx_receipt["status"] == 0:
reason = fetch_transaction_revert_reason(web3, tx_hash)
raise AssertionError(f"createPair({token_a.address}, {token_b.address}) transaction failed: {reason}, details: {tx_receipt}")
# https://ethereum.stackexchange.com/a/59288/620
# (AttributeDict({'args': AttributeDict({'token0': '0x2946259E0334f33A064106302415aD3391BeD384', 'token1': '0xB9816fC57977D5A786E654c7CF76767be63b966e', 'pair': '0x1278b4F4c25eE23DEEd803F16620009cBFbe7B13', '': 1}), 'event': 'PairCreated', 'logIndex': 0, 'transactionIndex': 0, 'transactionHash': HexBytes('0x5eea43a588a2f5865c4bc381e395f0db9db56dd1727d2433694df1faeacae33c'), 'address': '0xF2E246BB76DF876Cef8b38ae84130F4F55De395b', 'blockHash': HexBytes('0x13377d7e8a1b96165dbb777a5c98d313ba6a795d988007377fbc3c1df28c2a5b'), 'blockNumber': 6}),)
logs = factory.events.PairCreated().process_receipt(tx_receipt)
event0 = logs[0]
pair_address = event0["args"]["pair"]
if liquidity_a > 0:
router = deployment.router
assert token_a.functions.balanceOf(deployer).call() > liquidity_a, f"Cannot deploy, not enough tokens for token A: {token_a.functions.symbol().call()}"
assert token_b.functions.balanceOf(deployer).call() > liquidity_b, f"Cannot deploy, not enough tokens for token B: {token_b.functions.symbol().call()}"
# Make sure there is allowance for ERC20.transferFrom()
token_a.functions.approve(router.address, liquidity_a).transact({"from": deployer})
token_b.functions.approve(router.address, liquidity_b).transact({"from": deployer})
# https://docs.uniswap.org/protocol/V2/reference/smart-contracts/router-02#addliquidity
# https://github.com/sushiswap/sushiswap/blob/4fdfeb7dafe852e738c56f11a6cae855e2fc0046/contracts/uniswapv2/UniswapV2Router02.sol#L62
router.functions.addLiquidity(
token_a.address,
token_b.address,
liquidity_a,
liquidity_b,
1, # Have dummy value here
1, # Have dummy value here
deployer,
FOREVER_DEADLINE,
).transact({"from": deployer})
return pair_address
[docs]def fetch_deployment(
web3: Web3,
factory_address: Union[HexAddress, str],
router_address: Union[HexAddress, str],
init_code_hash: Optional[Union[HexStr, str]] = None,
allow_different_weth_var=True,
) -> UniswapV2Deployment:
"""Construct Uniswap deployment based on on-chain data.
Fetches init code hash from on-chain.
Factory does not know about routers, so they must be explicitly given.
`Read more details here <https://ethereum.stackexchange.com/questions/76334/what-is-the-difference-between-bytecode-init-code-deployed-bytedcode-creation>`_.
Example how to get PancakeSwap v2 deployment:
.. code-block:: python
@pytest.fixture()
def pancakeswap_v2(web3) -> UniswapV2Deployment:
deployment = fetch_deployment(
web3,
"0xcA143Ce32Fe78f1f7019d7d551a6402fC5350c73",
"0x10ED43C718714eb63d5aA57B78B54704E256024E",
# Taken from https://bscscan.com/address/0xca143ce32fe78f1f7019d7d551a6402fc5350c73#readContract
init_code_hash="0x00fb7f630766e6a796048ea87d01acd3068e8ff67d078148a3fa3f4a84f69bd5",
)
return deployment
:param init_code_hash:
Read init code hash from the caller. If not given call `pairCodeHash` (SushiSwap) on the factory.
:param allow_different_weth_var:
We assume Uniswap v2 ABI that has router.WETH() accessor.
Some DEXes like Trader Joe do not have it, using WAVAX
instead, needing a different ABI file.
If set (default) ignore this error and just have
`None` as the value for the wrapped token.
:return:
Data class representing Uniswap v3 exchange deployment
"""
factory = get_deployed_contract(web3, "sushi/UniswapV2Factory.json", factory_address)
# https://github.com/sushiswap/sushiswap/blob/4fdfeb7dafe852e738c56f11a6cae855e2fc0046/contracts/uniswapv2/UniswapV2Factory.sol#L26
if init_code_hash is None:
init_code_hash = factory.functions.pairCodeHash().call().hex()
router = get_deployed_contract(web3, "sushi/UniswapV2Router02.json", router_address)
# https://github.com/sushiswap/sushiswap/blob/4fdfeb7dafe852e738c56f11a6cae855e2fc0046/contracts/uniswapv2/UniswapV2Router02.sol#L17
try:
weth_address = router.functions.WETH().call()
weth = get_deployed_contract(web3, "sushi/WETH9Mock.json", weth_address)
except ContractLogicError as e:
if not allow_different_weth_var:
raise e
weth_address = None
weth = None
PairContract = get_contract(web3, "sushi/UniswapV2Pair.json")
return UniswapV2Deployment(
web3,
factory,
weth,
router,
init_code_hash,
PairContract,
)
[docs]def mock_partial_deployment_for_analysis(web3: Web3, router_address: str) -> UniswapV2Deployment:
"""Create a Uniswap deployment that is only usable in trade analysis.
Router and pair is all we need.
TODO: This function is likely to change / relocate.
"""
factory = None
init_code_hash = INIT_CODE_HASH_MISSING
router = get_deployed_contract(web3, "sushi/UniswapV2Router02.json", router_address)
PairContract = get_contract(web3, "sushi/UniswapV2Pair.json")
weth = None
return UniswapV2Deployment(
web3,
factory,
weth,
router,
init_code_hash,
PairContract,
)
# Getting the byte code as https://ethereum.stackexchange.com/questions/77528/web3-eth-getcode-doesnt-return-the-data-shown-on-etherscan
# Taken from https://etherscan.io/address/0xC0AEe478e3658e2610c5F7A4A2E1777cE9e4f2Ac#code
_SUSHI_FACTORY_BYTECODE = """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# See https://etherscan.io/tx/0x7714c68f1561629b3656da2e4aea1a5b9f1402568398a4396f9d256900230220
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# https://dev.sushi.com/sushiswap/contracts#sushiv2factory
_SUSHI_V2_INIT_CODE_HASH = "e18a34eb0e04b04f7a0ac29a6e80748dca96319b42c54d679cb821dca90c6303"
_GOOD_TRANSFER_SIGNATURES = (
# https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/IERC20.sol#L75
"Transfer(address,address,uint)",
# WETH9 wtf Transfer()
# https://github.com/gnosis/canonical-weth/blob/master/contracts/WETH9.sol#L24
"Transfer(address,address,uint,uint)",
)