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const ethUtil = require('ethereumjs-util')
const assert = require('assert')
const BN = require('bn.js')
module.exports = {
getStack,
sufficientBalance,
hexToBn,
bnToHex,
BnMultiplyByFraction,
}
function getStack () {
const stack = new Error('Stack trace generator - not an error').stack
return stack
}
function sufficientBalance (txParams, hexBalance) {
// validate hexBalance is a hex string
assert.equal(typeof hexBalance, 'string', 'sufficientBalance - hexBalance is not a hex string')
assert.equal(hexBalance.slice(0, 2), '0x', 'sufficientBalance - hexBalance is not a hex string')
const balance = hexToBn(hexBalance)
const value = hexToBn(txParams.value)
const gasLimit = hexToBn(txParams.gas)
const gasPrice = hexToBn(txParams.gasPrice)
const maxCost = value.add(gasLimit.mul(gasPrice))
return balance.gte(maxCost)
}
function bnToHex (inputBn) {
return ethUtil.addHexPrefix(inputBn.toString(16))
}
function hexToBn (inputHex) {
return new BN(ethUtil.stripHexPrefix(inputHex), 16)
}
function BnMultiplyByFraction (targetBN, numerator, denominator) {
const numBN = new BN(numerator)
const denomBN = new BN(denominator)
return targetBN.mul(numBN).div(denomBN)
}
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