dsemenovsky

# lib/tasks/db.rake
namespace :db do

  desc "Dumps the database to db/APP_NAME.dump"
  task :dump => :environment do
    cmd = nil
    with_config do |app, host, db, user|
      cmd = "pg_dump --host #{host} --username #{user} --verbose --clean --no-owner --no-acl --format=c #{db} > #{Rails.root}/db/#{app}.dump"
    end
    puts cmd

dsemenovsky

function watchEtherTransfers() {
  // Instantiate web3 with WebSocket provider
  const web3 = new Web3(new Web3.providers.WebsocketProvider('wss://rinkeby.infura.io/ws'))

  // Instantiate subscription object
  const subscription = web3.eth.subscribe('pendingTransactions')

  // Subscribe to pending transactions
  subscription.subscribe((error, result) => {
    if (error) console.log(error)

dsemenovsky

function watchTokenTransfers() {
  // Instantiate web3 with WebSocketProvider
  const web3 = new Web3(new Web3.providers.WebsocketProvider('wss://rinkeby.infura.io/ws'))

  // Instantiate token contract object with JSON ABI and address
  const tokenContract = new web3.eth.Contract(
    TOKEN_ABI, process.env.TOKEN_CONTRACT_ADDRESS,
    (error, result) => { if (error) console.log(error) }
  )

dsemenovsky

async function getConfirmations(txHash) {
  try {
    // Instantiate web3 with HttpProvider
    const web3 = new Web3('https://rinkeby.infura.io/')

    // Get transaction details
    const trx = await web3.eth.getTransaction(txHash)

    // Get current block number
    const currentBlock = await web3.eth.getBlockNumber()

dsemenovsky

function confirmEtherTransaction(txHash, confirmations = 10) {
  setTimeout(async () => {
    
    // Get current number of confirmations and compare it with sought-for value
    const trxConfirmations = await getConfirmations(txHash)
    
    console.log('Transaction with hash ' + txHash + ' has ' + trxConfirmations + ' confirmation(s)')

    if (trxConfirmations >= confirmations) {
      // Handle confirmation event according to your business logic