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from collections import defaultdict

GETH_LOGFILE = 'geth-log.txt'


def extract_parameter(source_str, before_str, after_str):
    start_pos = source_str.find(before_str) + len(before_str)
    return source_str[start_pos:source_str.find(after_str, start_pos)]

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pragma solidity ^0.4.24;


contract ECDSA {

    function verify() public returns (bool) {
        bytes32 message = ethMessageHash("TEST");

        bytes memory sig = hex"bceab59162da5e511fb9c37fda207d443d05e438e5c843c57b2d5628580ce9216ffa0335834d8bb63d86fb42a8dd4d18f41bc3a301546e2c47aa1041c3a1823701";
        address addr = 0x999471bb43b9c9789050386f90c1ad63dca89106;

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pragma solidity ^0.7.6;

interface IStableSwapAave {
    function A_precise() external view returns (uint256);

    function balances(uint256 i) external view returns (uint256);

    function underlying_coins(uint256 arg0) external view returns (address);

    function admin_balances(uint256 arg0) external view returns (uint256);

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'use strict';

const WEB3_URL = process.env.WEB3_URL;

const prom     = require('util').promisify;
const ethABI   = require('ethereumjs-abi');
const Web3     = require('web3');
const provider = new Web3.providers.HttpProvider(WEB3_URL);
const web3     = module.exports = new Web3(provider);
const sendAsync = prom(web3.currentProvider.sendAsync).bind(web3.currentProvider);

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• example: https://medium.com/swlh/build-and-use-go-packages-as-c-libraries-889eb0c19838

https://medium.com/@walkert/fun-building-shared-libraries-in-go-639500a6a669

https://www.darkcoding.net/software/building-shared-libraries-in-go-part-2/

https://karthikkaranth.me/blog/calling-c-code-from-go/

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See also, http://libraryofalexandria.io/cgo/

Using Go cgo

cgo has a lot of trap.
but Not "C" pkg also directory in $GOROOT/src. IDE's(vim) Goto command not works.

So, Here collect materials.

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// RLP encoded transaction
const rawTxHex = '0xed8205fc843b9aca00825208944592d8f8d7b001e72cb26a73e4fa1806a51ac79d88016345785d8a000080808080'

// using rlp package to decode values
const rlp = require('rlp')
const decoded = rlp.decode(rawTxHex)
console.log(decoded)
/*
[ <Buffer 05 fc>,
  <Buffer 3b 9a ca 00>,

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import timeit
import threading
import asyncio
import contextlib
import requests

from aiohttp import ClientSession

from web3.providers.base import JSONBaseProvider
from web3.providers import HTTPProvider

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const puppeteer = require('puppeteer');
const spawn = require('@expo/spawn-async');
const v4 = require('uuid').v4;
const UserAgent = require('user-agents');

const faucet = 'https://explorer.certik.foundation/faucet';

const address_query = 'input[name=address]';

const button_click = 'form button[type=submit]';

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type Point struct {
	GasPriceX  *big.Int
	EthProfitY *big.Int
}

func (b *Bot) MaxProfitPossible(p1, p2 Point) *big.Int {
	rise := new(big.Int).Sub(p2.EthProfitY, p1.EthProfitY)
	run := new(big.Int).Sub(p2.GasPriceX, p1.GasPriceX)
	slope := new(big.Float).Quo(
		new(big.Float).SetInt(rise),