You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
98 lines
3.3 KiB
98 lines
3.3 KiB
const EthQuery = require('ethjs-query')
|
|
const Transaction = require('ethereumjs-tx')
|
|
const normalize = require('eth-sig-util').normalize
|
|
const {
|
|
hexToBn,
|
|
BnMultiplyByFraction,
|
|
bnToHex,
|
|
} = require('./util')
|
|
|
|
/*
|
|
tx-utils are utility methods for Transaction manager
|
|
its passed ethquery
|
|
and used to do things like calculate gas of a tx.
|
|
*/
|
|
|
|
module.exports = class txProvideUtil {
|
|
constructor (provider) {
|
|
this.query = new EthQuery(provider)
|
|
}
|
|
|
|
async analyzeGasUsage (txMeta) {
|
|
const block = await this.query.getBlockByNumber('latest', true)
|
|
const estimatedGasHex = await this.estimateTxGas(txMeta, block.gasLimit)
|
|
this.setTxGas(txMeta, block.gasLimit, estimatedGasHex)
|
|
return txMeta
|
|
}
|
|
|
|
async estimateTxGas (txMeta, blockGasLimitHex) {
|
|
const txParams = txMeta.txParams
|
|
// check if gasLimit is already specified
|
|
txMeta.gasLimitSpecified = Boolean(txParams.gas)
|
|
// if not, fallback to block gasLimit
|
|
if (!txMeta.gasLimitSpecified) {
|
|
const blockGasLimitBN = hexToBn(blockGasLimitHex)
|
|
const saferGasLimitBN = BnMultiplyByFraction(blockGasLimitBN, 19, 20)
|
|
txParams.gas = bnToHex(saferGasLimitBN)
|
|
}
|
|
// run tx, see if it will OOG
|
|
return this.query.estimateGas(txParams)
|
|
}
|
|
|
|
setTxGas (txMeta, blockGasLimitHex, estimatedGasHex) {
|
|
txMeta.estimatedGas = estimatedGasHex
|
|
const txParams = txMeta.txParams
|
|
|
|
// if gasLimit was specified and doesnt OOG,
|
|
// use original specified amount
|
|
if (txMeta.gasLimitSpecified) {
|
|
txMeta.estimatedGas = txParams.gas
|
|
return
|
|
}
|
|
// if gasLimit not originally specified,
|
|
// try adding an additional gas buffer to our estimation for safety
|
|
const recommendedGasHex = this.addGasBuffer(txMeta.estimatedGas, blockGasLimitHex)
|
|
txParams.gas = recommendedGasHex
|
|
return
|
|
}
|
|
|
|
addGasBuffer (initialGasLimitHex, blockGasLimitHex) {
|
|
const initialGasLimitBn = hexToBn(initialGasLimitHex)
|
|
const blockGasLimitBn = hexToBn(blockGasLimitHex)
|
|
const upperGasLimitBn = blockGasLimitBn.muln(0.9)
|
|
const bufferedGasLimitBn = initialGasLimitBn.muln(1.5)
|
|
|
|
// if initialGasLimit is above blockGasLimit, dont modify it
|
|
if (initialGasLimitBn.gt(upperGasLimitBn)) return bnToHex(initialGasLimitBn)
|
|
// if bufferedGasLimit is below blockGasLimit, use bufferedGasLimit
|
|
if (bufferedGasLimitBn.lt(upperGasLimitBn)) return bnToHex(bufferedGasLimitBn)
|
|
// otherwise use blockGasLimit
|
|
return bnToHex(upperGasLimitBn)
|
|
}
|
|
|
|
// builds ethTx from txParams object
|
|
buildEthTxFromParams (txParams) {
|
|
// normalize values
|
|
txParams.to = normalize(txParams.to)
|
|
txParams.from = normalize(txParams.from)
|
|
txParams.value = normalize(txParams.value)
|
|
txParams.data = normalize(txParams.data)
|
|
txParams.gas = normalize(txParams.gas || txParams.gasLimit)
|
|
txParams.gasPrice = normalize(txParams.gasPrice)
|
|
txParams.nonce = normalize(txParams.nonce)
|
|
// build ethTx
|
|
log.info(`Prepared tx for signing: ${JSON.stringify(txParams)}`)
|
|
const ethTx = new Transaction(txParams)
|
|
return ethTx
|
|
}
|
|
|
|
async publishTransaction (rawTx) {
|
|
return await this.query.sendRawTransaction(rawTx)
|
|
}
|
|
|
|
async validateTxParams (txParams) {
|
|
if (('value' in txParams) && txParams.value.indexOf('-') === 0) {
|
|
throw new Error(`Invalid transaction value of ${txParams.value} not a positive number.`)
|
|
}
|
|
}
|
|
} |