Support for decode

Data processing not only supports encoding (encode), but also decoding (decode). Use the exchange.IO("decode", types, rawData) function to perform the decode operation.

function main() {
    // register SwapRouter02 abi
    var walletAddress = "0x398a93ca23CBdd2642a07445bCD2b8435e0a373f"
    var routerAddress = "0x68b3465833fb72A70ecDF485E0e4C7bD8665Fc45"
    var abi = `[{"inputs":[{"components":[{"internalType":"bytes","name":"path","type":"bytes"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"uint256","name":"amountInMaximum","type":"uint256"}],"internalType":"struct IV3SwapRouter.ExactOutputParams","name":"params","type":"tuple"}],"name":"exactOutput","outputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"}],"stateMutability":"payable","type":"function"}]`
    exchange.IO("abi", routerAddress, abi)   // abi only uses the contents of the local exactOutput method, the full abi can be searched on the Internet

    // encode path
    var fee = exchange.IO("encodePacked", "uint24", 3000)
    var tokenInAddress = "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2"
    var tokenOutAddress = "0xdac17f958d2ee523a2206206994597c13d831ec7"
    var path = tokenInAddress.slice(2).toLowerCase()
    path += fee + tokenOutAddress.slice(2).toLowerCase()
    Log("path:", path)

    var dataTuple = {
        "path" : path, 
        "recipient" : walletAddress, 
        "amountOut" : 1000, 
        "amountInMaximum" : 1, 
    }
    // encode SwapRouter02 exactOutput 
    var rawData = exchange.IO("encode", routerAddress, "exactOutput", dataTuple)
    Log("method hash:", rawData.slice(0, 8))   // 09b81346
    Log("params hash:", rawData.slice(8))

    // decode exactOutput params
    var decodeRaw = exchange.IO("decode", "tuple(path bytes,recipient address,amountOut uint256,amountInMaximum uint256)", rawData.slice(8))
    Log("decodeRaw:", decodeRaw)
}

The example performs the encodePacked operation first during the path parameter processing, because the exactOutput method call that needs to be encoded later needs the path as the parameter. Then, the encode method of the exactOutput routing contract has only one parameter, and the parameter type is tuple. The method exactOutput name is encoded as 0x09b81346, which is decoded the result decodeRaw by exchange.IO ("decode",...) method, and it is consistent with the variable dataTuple.

Support for encodePacked Support for Switching Private Keys