gas calculations wip

This commit is contained in:
mmv 2019-05-22 13:14:41 +04:00
parent 7019d46e13
commit a984d08a3d
3 changed files with 91 additions and 84 deletions

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@ -1,90 +1,6 @@
// @flow
import { getWeb3 } from '~/logic/wallets/getWeb3'
import { BigNumber } from 'bignumber.js'
import { EMPTY_DATA } from '~/logic/wallets/ethTransactions'
import { getSignaturesFrom } from '~/utils/storage/signatures'
import { getSafeEthereumInstance } from './safeFrontendOperations'
const estimateDataGasCosts = (data) => {
const reducer = (accumulator, currentValue) => {
if (currentValue === EMPTY_DATA) {
return accumulator + 0
}
if (currentValue === '00') {
return accumulator + 4
}
return accumulator + 68
}
return data.match(/.{2}/g).reduce(reducer, 0)
}
export const estimateDataGas = (
safe: any,
to: string,
valueInWei: number,
data: string,
operation: number,
txGasEstimate: number,
gasToken: number,
nonce: number,
signatureCount: number,
refundReceiver: number,
) => {
// numbers < 256 are 192 -> 31 * 4 + 68
// numbers < 65k are 256 -> 30 * 4 + 2 * 68
// For signature array length and dataGasEstimate we already calculated
// the 0 bytes so we just add 64 for each non-zero byte
const gasPrice = 0 // no need to get refund when we submit txs to metamask
const signatureCost = signatureCount * (68 + 2176 + 2176) // array count (3 -> r, s, v) * signature count
const sigs = getSignaturesFrom(safe.address, nonce)
const payload = safe.contract.methods
.execTransaction(to, valueInWei, data, operation, txGasEstimate, 0, gasPrice, gasToken, refundReceiver, sigs)
.encodeABI()
let dataGasEstimate = estimateDataGasCosts(payload) + signatureCost
if (dataGasEstimate > 65536) {
dataGasEstimate += 64
} else {
dataGasEstimate += 128
}
return dataGasEstimate + 34000 // Add aditional gas costs (e.g. base tx costs, transfer costs)
}
// eslint-disable-next-line
export const generateTxGasEstimateFrom = async (
safe: any,
safeAddress: string,
data: string,
to: string,
valueInWei: number,
operation: number,
) => {
try {
let safeInstance = safe
if (!safeInstance) {
safeInstance = await getSafeEthereumInstance(safeAddress)
}
const estimateData = safeInstance.contract.methods.requiredTxGas(to, valueInWei, data, operation).encodeABI()
const estimateResponse = await getWeb3().eth.call({
to: safeAddress,
from: safeAddress,
data: estimateData,
})
const txGasEstimate = new BigNumber(estimateResponse.substring(138), 16)
// Add 10k else we will fail in case of nested calls
return txGasEstimate.toNumber() + 10000
} catch (error) {
// eslint-disable-next-line
console.log('Error calculating tx gas estimation ' + error)
return 0
}
}
const generateTypedDataFrom = async (
safe: any,

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// @flow
import { getSignaturesFrom } from '~/utils/storage/signatures'
import { BigNumber } from 'bignumber.js'
import { getWeb3 } from '~/logic/wallets/getWeb3'
import { EMPTY_DATA } from '~/logic/wallets/ethTransactions'
import { getSafeEthereumInstance } from '../safeFrontendOperations'
const estimateDataGasCosts = (data) => {
const reducer = (accumulator, currentValue) => {
if (currentValue === EMPTY_DATA) {
return accumulator + 0
}
if (currentValue === '00') {
return accumulator + 4
}
return accumulator + 68
}
return data.match(/.{2}/g).reduce(reducer, 0)
}
// https://gnosis-safe.readthedocs.io/en/latest/contracts/transactions.html#safe-transaction-data-gas-estimation
// https://github.com/gnosis/safe-contracts/blob/a97c6fd24f79c0b159ddd25a10a2ebd3ea2ef926/test/utils/execution.js
export const estimateDataGas = (
safe: any,
to: string,
valueInWei: number,
data: string,
operation: number,
txGasEstimate: number,
gasToken: number,
nonce: number,
signatureCount: number,
refundReceiver: number,
) => {
// numbers < 256 are 192 -> 31 * 4 + 68
// numbers < 65k are 256 -> 30 * 4 + 2 * 68
// For signature array length and dataGasEstimate we already calculated
// the 0 bytes so we just add 64 for each non-zero byte
const gasPrice = 0 // no need to get refund when we submit txs to metamask
const signatureCost = signatureCount * (68 + 2176 + 2176) // array count (3 -> r, s, v) * signature count
const sigs = getSignaturesFrom(safe.address, nonce)
const payload = safe.contract.methods
.execTransaction(to, valueInWei, data, operation, txGasEstimate, 0, gasPrice, gasToken, refundReceiver, sigs)
.encodeABI()
let dataGasEstimate = estimateDataGasCosts(payload) + signatureCost
if (dataGasEstimate > 65536) {
dataGasEstimate += 64
} else {
dataGasEstimate += 128
}
return dataGasEstimate + 34000 // Add aditional gas costs (e.g. base tx costs, transfer costs)
}
// eslint-disable-next-line
export const generateTxGasEstimateFrom = async (
safe: any,
safeAddress: string,
data: string,
to: string,
valueInWei: number,
operation: number,
) => {
try {
let safeInstance = safe
if (!safeInstance) {
safeInstance = await getSafeEthereumInstance(safeAddress)
}
const estimateData = safeInstance.contract.methods.requiredTxGas(to, valueInWei, data, operation).encodeABI()
const estimateResponse = await getWeb3().eth.call({
to: safeAddress,
from: safeAddress,
data: estimateData,
})
const txGasEstimate = new BigNumber(estimateResponse.substring(138), 16)
// Add 10k else we will fail in case of nested calls
return txGasEstimate.toNumber() + 10000
} catch (error) {
// eslint-disable-next-line
console.log('Error calculating tx gas estimation ' + error)
return 0
}
}

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// @flow
export * from './gas'