simple tuple decoding

tuple_decode.py

from eth_abi import decode
from eth_utils import to_hex, to_checksum_address

def decode_swap_data(hex_data):
    # Remove '0x' if present
    hex_data = hex_data.replace('0x', '')
    
    # First, decode the initial offset
    data_bytes = bytes.fromhex(hex_data)
    (initial_offset,) = decode(['uint256'], data_bytes[:32])
    
    # Now decode the actual data starting from the offset
    actual_data = data_bytes[initial_offset:]
    
    # Define types in the same order as the struct
    # Example of struct in Solidity:
    """     
    struct SwapData {
        address fromAsset;
        address toAsset;
        uint256 amount;
        uint256 receiveAtLeast;
        uint256 fee;
        bytes withData;
        bool collectFeeInFromToken;
        FeeType feeType;
    } 
    """
    types = [
        'address',   # fromAsset
        'address',   # toAsset
        'uint256',   # amount
        'uint256',   # receiveAtLeast
        'uint256',   # fee
        'bytes',     # withData
        'bool',      # collectFeeInFromToken
        'uint8'      # feeType (enum)
    ]
    
    # Decode the data
    decoded = decode(types, actual_data)
    
    # Format the result into a dictionary ( optional to return feeType as enum )
    result = {
        'fromAsset': to_checksum_address(decoded[0]),
        'toAsset': to_checksum_address(decoded[1]),
        'amount': decoded[2],
        'receiveAtLeast': decoded[3],
        'fee': decoded[4],
        'withData': to_hex(decoded[5]),
        'collectFeeInFromToken': decoded[6],
        'feeType': 'Percentage' if decoded[7] == 0 else 'Fixed' # e.g. FeeType is an enum with values 0 for Percentage and 1 for Fixed
    }
    
    return result

# Your input data
hex_input = "0x..............."
             
try:
    decoded_data = decode_swap_data(hex_input)
    
    # Pretty print the result
    print("Decoded SwapData:")
    for key, value in decoded_data.items():
        print(f"{key}: {value}")
        
except Exception as e:
    print(f"Error decoding data: {str(e)}")