sogoiii’s gists

sogoiii / call_callcode_delegateCall.sol

Last active March 2, 2021 02:54

Example of call, callcode and delegateCall in solidity: Taken from https://ethereum.stackexchange.com/questions/3667/difference-between-call-callcode-and-delegatecall

	pragma solidity ^0.4.18;
	contract D {
	uint public n;
	address public sender;

	function callSetN(address _e, uint _n) public {
	_e.call(bytes4(keccak256("setN(uint256)")), _n); // E's storage is set, D is not modified
	}

	function callcodeSetN(address _e, uint _n) public {

sogoiii / truffle_contract_example

Created February 15, 2018 02:11

Truffle contract interaction example

	import contract from 'truffle-contract'
	const contractArtifact = require('./build/contracts/TutorialToken.json')

	const web3 = new Web3()
	const providerUrl = 'http://localhost:8545'
	const provider = new Web3.providers.HttpProvider(providerUrl)
	web3.setProvider(provider)

	const TutorialToken = contract(contractArtifact)

sogoiii / ListenToEventsWeb3-1-0-0-beta.js

Last active December 26, 2023 23:00

Listening to Solidity events using web3 1.0.0 beta

	const Web3 = require('web3') // Works with web3 1.0.0-beta27
	const contractArtifact = require('./build/contracts/TutorialToken.json')

	const web3 = new Web3()
	const providerUrl = 'ws://localhost:8545' // requires # https://github.com/trufflesuite/ganache-cli/releases/tag/v7.0.0-beta.0 or https://github.com/trufflesuite/ganache/releases/tag/v1.1.0-beta.0
	const provider = new Web3.providers.WebsocketProvider(providerUrl)
	web3.setProvider(provider)

	web3.eth.net.getId()
	.then(networkId => {

sogoiii / ListenToEventsWeb3-0-20-4.js

Last active July 31, 2023 06:53

Listening to web3 events in version 0.20.4 and below

	const Web3 = require('web3') // Works with web3 0.20.4
	const contractArtifact = require('./build/contracts/TutorialToken.json')

	const web3 = new Web3()
	const providerUrl = 'http://localhost:8545'
	const provider = new Web3.providers.HttpProvider(providerUrl)
	web3.setProvider(provider)

	const networkId = web3.version.network
	const contractAddr = contractArtifact.networks[networkId].address

sogoiii / ListenToEventsTruffleAnyWeb3.js

Last active July 31, 2023 06:52

Example on how to use truffle to listen to events in your smart contracts

	const Web3 = require('web3') // Web3 0.20.4 or web3 1 beta
	const truffleContract = require("truffle-contract")
	const contractArtifact = require('./build/contracts/TutorialToken.json')

	const providerUrl = 'http://localhost:8545'
	const provider = new Web3.providers.HttpProvider(providerUrl)

	const contract = truffleContract(contractArtifact)
	contract.setProvider(provider)

sogoiii / MyContract.sol

Last active January 22, 2018 03:35

Sample Solidity Events

	pragma solidity ^0.4.18;

	contract MyContract {

	event Transfer(address indexed from, address indexed to, uint256 value); /* This is an event */

	function MyContract() {} /* a constructor */

	function transfer(address _to) public {
	Transfer(msg.sender, _to, msg.value);

sogoiii / interact.js

Created September 1, 2017 21:53

Interact with a deployed solidity contract

	const Web3 = require('web3')
	const fs = require('fs')

	const ethereumURL = 'http://0.0.0.0:8545'
	const provider = new Web3.providers.HttpProvider(ethereumURL)
	const web3 = new Web3(provider)

	const contractInfo = JSON.parse(fs.readFileSync('./MetaCoinABI.js', 'utf8'))
	const MyContract = web3.eth.contract(contractInfo.abi);
	const contractInstance = MyContract.at(contractInfo.address);

sogoiii / index.html

Created July 18, 2017 21:07

Browser to IPFS example

	<!DOCTYPE html>
	<html>
	<head>
	<title>JavaScript file upload</title>
	<meta http-equiv="content-type" content="text/html; charset=UTF-8">
	<script src="https://wzrd.in/standalone/buffer"></script>
	<script src="https://unpkg.com/[email protected]/dist/index.js"
	integrity="sha384-5bXRcW9kyxxnSMbOoHzraqa7Z0PQWIao+cgeg327zit1hz5LZCEbIMx/LWKPReuB"
	crossorigin="anonymous"></script>
	</head>

sogoiii / EtherAddressLookupBlackListAnalysis.js

Created July 12, 2017 19:28

EtherAddressLookup analysis on their blacklist

	const blacklist = require('./blacklist')
	const levenshtein = require('fast-levenshtein')
	const math = require('mathjs')
	const comparison = 'myetherwallet'

	const allScores = blacklist.map(item => {
	return {
	domain: item,
	score: levenshtein.get(item.replace(/\./g,''), comparison)
	}

sogoiii / large_async_await_test.js

Created June 30, 2017 19:03

Large async await test in Truffle

	it("should send coin correctly", async function () {
	// Get initial balances of first and second account.
	var account_one = accounts[0];
	var account_two = accounts[1];

	var amount = 10;

	let meta = await MetaCoin.deployed();
	let balance1 = await meta.getBalance.call(account_one);
	let balance2 = await meta.getBalance.call(account_two);

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