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Swap simulation with pyrevm
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| from eth_abi import decode, encode | |
| from eth_utils import function_signature_to_4byte_selector | |
| from pyrevm import EVM | |
| # https://etherscan.io/tx/0x652bae3b1c11fbcf64309c2dfec5537b9bd1d3f2b521176f71ba1115a313ecbd" | |
| # Swap 0.031485012992133186 ETH for 1,110.686711078457978839 CSWAP on Uniswap v2 | |
| block_number = 19726294 | |
| caller = "0xc0170e050355408e53800d093f3f13c3a53b29c8" | |
| router = "0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D" | |
| token = "0xae41b275aaAF484b541A5881a2dDED9515184CCA" | |
| value = 31485012992133186 | |
| tx_input = bytes.fromhex( | |
| "b6f9de9500000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000080000000000000000000000000f39fd6e51aad88f6f4ce6ab8827279cfffb92266ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff0000000000000000000000000000000000000000000000000000000000000002000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2000000000000000000000000ae41b275aaaf484b541a5881a2dded9515184cca" | |
| ) | |
| def balance_of(erc20, address): | |
| selector = function_signature_to_4byte_selector("balanceOf(address)") | |
| encoded_address = encode(["address"], [address]) | |
| calldata = selector + encoded_address | |
| balance = evm.message_call( | |
| caller=caller, | |
| to=erc20, | |
| calldata=calldata, | |
| ) | |
| return decode(["uint256"], balance)[0] | |
| fork_url = "https://eth.llamarpc.com" | |
| evm = EVM( | |
| fork_url=fork_url, | |
| fork_block=str(block_number - 1), | |
| ) | |
| amount_before = balance_of(token, caller) | |
| print("Amount before:", amount_before) | |
| # simulate swap | |
| evm.set_balance(caller, value) | |
| output = evm.message_call( | |
| caller=caller, | |
| to=router, | |
| calldata=tx_input, | |
| value=value, | |
| ) | |
| amount_after = balance_of(token, caller) | |
| print("Amount after :", amount_after) | |
| amount = amount_after - amount_before | |
| expected = 1055152375524535079898 | |
| assert amount == expected |
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