nwaku/tests/v2/test_utils.nim

import web3, chronos, options, stint

proc deployContract*(web3: Web3, code: string, gasPrice = 0, contractInput = ""): Future[ReceiptObject] {.async.} =
  # the contract input is the encoded version of contract constructor's input
  # use nim-web3/encoding.nim module to find the appropriate encoding procedure for different argument types
  # e.g., consider the following contract constructor in solidity
  # 	constructor(uint256 x, uint256 y) 
  #
  # the contractInput can be calculated as follows
  # let
  #   x = 1.u256
  #   y = 5.u256
  # contractInput = encode(x).data  &  encode(y).data 
  # Note that the order of encoded inputs should match the order of the constructor inputs
  let provider = web3.provider
  let accounts = await provider.eth_accounts()

  var code = code
  if code[1] notin {'x', 'X'}:
    code = "0x" & code
  var tr: EthSend
  tr.source = web3.defaultAccount
  tr.data = code & contractInput
  tr.gas = Quantity(3000000000000).some
  if gasPrice != 0:
    tr.gasPrice = some(gasPrice)

  let r = await web3.send(tr)
  return await web3.getMinedTransactionReceipt(r)

proc ethToWei*(eth: UInt256): UInt256 =
  eth * 1000000000000000000.u256