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const {
addCurrencies,
conversionUtil,
conversionGTE,
multiplyCurrencies,
conversionGreaterThan,
} = require('../../conversion-util')
const {
calcTokenAmount,
} = require('../../token-util')
const {
INSUFFICIENT_FUNDS_ERROR,
INSUFFICIENT_TOKENS_ERROR,
NEGATIVE_ETH_ERROR,
ONE_GWEI_IN_WEI_HEX,
SIMPLE_GAS_COST,
} = require('./send.constants')
const EthQuery = require('ethjs-query')
const abi = require('ethereumjs-abi')
module.exports = {
calcGasTotal,
calcTokenBalance,
doesAmountErrorRequireUpdate,
estimateGas,
estimateGasPriceFromRecentBlocks,
generateTokenTransferData,
getAmountErrorObject,
isBalanceSufficient,
isTokenBalanceSufficient,
}
function calcGasTotal (gasLimit, gasPrice) {
return multiplyCurrencies(gasLimit, gasPrice, {
toNumericBase: 'hex',
multiplicandBase: 16,
multiplierBase: 16,
})
}
function isBalanceSufficient ({
amount = '0x0',
amountConversionRate = 0,
balance,
conversionRate,
gasTotal = '0x0',
primaryCurrency,
}) {
const totalAmount = addCurrencies(amount, gasTotal, {
aBase: 16,
bBase: 16,
toNumericBase: 'hex',
})
const balanceIsSufficient = conversionGTE(
{
value: balance,
fromNumericBase: 'hex',
fromCurrency: primaryCurrency,
conversionRate,
},
{
value: totalAmount,
fromNumericBase: 'hex',
conversionRate: Number(amountConversionRate) || conversionRate,
fromCurrency: primaryCurrency,
},
)
return balanceIsSufficient
}
function isTokenBalanceSufficient ({
amount = '0x0',
tokenBalance,
decimals,
}) {
const amountInDec = conversionUtil(amount, {
fromNumericBase: 'hex',
})
const tokenBalanceIsSufficient = conversionGTE(
{
value: tokenBalance,
fromNumericBase: 'dec',
},
{
value: calcTokenAmount(amountInDec, decimals),
fromNumericBase: 'dec',
},
)
return tokenBalanceIsSufficient
}
function getAmountErrorObject ({
amount,
amountConversionRate,
balance,
conversionRate,
gasTotal,
primaryCurrency,
selectedToken,
tokenBalance,
}) {
let insufficientFunds = false
if (gasTotal && conversionRate) {
insufficientFunds = !isBalanceSufficient({
amount: selectedToken ? '0x0' : amount,
amountConversionRate,
balance,
conversionRate,
gasTotal,
primaryCurrency,
})
}
let inSufficientTokens = false
if (selectedToken && tokenBalance !== null) {
const { decimals } = selectedToken
inSufficientTokens = !isTokenBalanceSufficient({
tokenBalance,
amount,
decimals,
})
}
const amountLessThanZero = conversionGreaterThan(
{ value: 0, fromNumericBase: 'dec' },
{ value: amount, fromNumericBase: 'hex' },
)
let amountError = null
if (insufficientFunds) {
amountError = INSUFFICIENT_FUNDS_ERROR
} else if (inSufficientTokens) {
amountError = INSUFFICIENT_TOKENS_ERROR
} else if (amountLessThanZero) {
amountError = NEGATIVE_ETH_ERROR
}
return { amount: amountError }
}
function calcTokenBalance ({ selectedToken, usersToken }) {
const { decimals } = selectedToken || {}
return calcTokenAmount(usersToken.balance.toString(), decimals) + ''
}
function doesAmountErrorRequireUpdate ({
balance,
gasTotal,
prevBalance,
prevGasTotal,
prevTokenBalance,
selectedToken,
tokenBalance,
}) {
const balanceHasChanged = balance !== prevBalance
const gasTotalHasChange = gasTotal !== prevGasTotal
const tokenBalanceHasChanged = selectedToken && tokenBalance !== prevTokenBalance
const amountErrorRequiresUpdate = balanceHasChanged || gasTotalHasChange || tokenBalanceHasChanged
return amountErrorRequiresUpdate
}
async function estimateGas ({ selectedAddress, selectedToken, data, blockGasLimit, to }) {
const ethQuery = new EthQuery(global.ethereumProvider)
const { symbol } = selectedToken || {}
const estimatedGasParams = { from: selectedAddress }
if (symbol) {
Object.assign(estimatedGasParams, { value: '0x0' })
}
if (data) {
Object.assign(estimatedGasParams, { data })
}
// if recipient has no code, gas is 21k max:
const hasRecipient = Boolean(to)
let code
if (hasRecipient) code = await ethQuery.getCode(to)
if (hasRecipient && (!code || code === '0x')) {
return SIMPLE_GAS_COST
}
estimatedGasParams.to = to
// if not, fall back to block gasLimit
estimatedGasParams.gas = multiplyCurrencies(blockGasLimit, 0.95, {
multiplicandBase: 16,
multiplierBase: 10,
roundDown: '0',
toNumericBase: 'hex',
})
// run tx
const estimatedGas = await ethQuery.estimateGas(estimatedGasParams)
return estimatedGas.toString(16)
}
function generateTokenTransferData (selectedAddress, selectedToken) {
if (!selectedToken) return
console.log(`abi.rawEncode`, abi.rawEncode)
return Array.prototype.map.call(
abi.rawEncode(['address', 'uint256'], [selectedAddress, '0x0']),
x => ('00' + x.toString(16)).slice(-2)
).join('')
}
function hexComparator (a, b) {
return conversionGreaterThan(
{ value: a, fromNumericBase: 'hex' },
{ value: b, fromNumericBase: 'hex' },
) ? 1 : -1
}
function estimateGasPriceFromRecentBlocks (recentBlocks) {
// Return 1 gwei if no blocks have been observed:
if (!recentBlocks || recentBlocks.length === 0) {
return ONE_GWEI_IN_WEI_HEX
}
const lowestPrices = recentBlocks.map((block) => {
if (!block.gasPrices || block.gasPrices.length < 1) {
return ONE_GWEI_IN_WEI_HEX
}
return block.gasPrices
.sort(hexComparator)[0]
})
.sort(hexComparator)
return lowestPrices[Math.floor(lowestPrices.length / 2)]
}
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