Source code for eth_defi.uniswap_v2.deployment

"""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

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


#: 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

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) 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: 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.toChecksumAddress(pair_for(self.factory.address, token0, token1, self.init_code_hash)), token0, token1)
[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, "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, "WETH9Mock.json", deployer) router = deploy_contract(web3, "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, "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 token_a.address != token_b.address 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 # https://github.com/sushiswap/sushiswap/blob/4fdfeb7dafe852e738c56f11a6cae855e2fc0046/contracts/uniswapv2/UniswapV2Factory.sol#L30 tx_hash = factory.functions.createPair(token_a.address, token_b.address).transact({"from": deployer}) tx_receipt = web3.eth.wait_for_transaction_receipt(tx_hash) # 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().processReceipt(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 assert token_b.functions.balanceOf(deployer).call() > liquidity_b # 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, "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, "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, "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, "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, "UniswapV2Router02.json", router_address) PairContract = get_contract(web3, "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 _SUSHI_FACTORY_DEPLOYMENT_DATA = 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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)", )