mirror of
https://github.com/kremalicious/metamask-extension.git
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b6ccd22d6c
Co-authored-by: Mark Stacey <markjstacey@gmail.com>
100 lines
3.0 KiB
JavaScript
100 lines
3.0 KiB
JavaScript
import BigNumber from 'bignumber.js'
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export function newBigSigDig (n) {
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return new BigNumber((new BigNumber(String(n))).toPrecision(15))
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}
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const createOp = (a, b, op) => (newBigSigDig(a))[op](newBigSigDig(b))
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export function bigNumMinus (a = 0, b = 0) {
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return createOp(a, b, 'minus')
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}
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export function bigNumDiv (a = 0, b = 1) {
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return createOp(a, b, 'div')
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}
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export function extrapolateY ({ higherY = 0, lowerY = 0, higherX = 0, lowerX = 0, xForExtrapolation = 0 }) {
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const slope = bigNumMinus(higherY, lowerY).div(bigNumMinus(higherX, lowerX))
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const newTimeEstimate = slope.times(bigNumMinus(higherX, xForExtrapolation)).minus(newBigSigDig(higherY)).negated()
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return newTimeEstimate.toNumber()
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}
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export function getAdjacentGasPrices ({ gasPrices, priceToPosition }) {
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const closestLowerValueIndex = gasPrices.findIndex((e, i, a) => e <= priceToPosition && a[i + 1] >= priceToPosition)
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const closestHigherValueIndex = gasPrices.findIndex((e) => e > priceToPosition)
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return {
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closestLowerValueIndex,
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closestHigherValueIndex,
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closestHigherValue: gasPrices[closestHigherValueIndex],
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closestLowerValue: gasPrices[closestLowerValueIndex],
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}
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}
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export function formatTimeEstimate (totalSeconds, greaterThanMax, lessThanMin) {
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const minutes = Math.floor(totalSeconds / 60)
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const seconds = Math.floor(totalSeconds % 60)
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if (!minutes && !seconds) {
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return '...'
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}
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let symbol = '~'
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if (greaterThanMax) {
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symbol = '< '
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} else if (lessThanMin) {
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symbol = '> '
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}
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const formattedMin = `${minutes ? `${minutes} min` : ''}`
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const formattedSec = `${seconds ? `${seconds} sec` : ''}`
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const formattedCombined = formattedMin && formattedSec
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? `${symbol}${formattedMin} ${formattedSec}`
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: symbol + (formattedMin || formattedSec)
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return formattedCombined
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}
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export function getRawTimeEstimateData (currentGasPrice, gasPrices, estimatedTimes) {
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const minGasPrice = gasPrices[0]
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const maxGasPrice = gasPrices[gasPrices.length - 1]
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let priceForEstimation = currentGasPrice
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if (currentGasPrice < minGasPrice) {
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priceForEstimation = minGasPrice
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} else if (currentGasPrice > maxGasPrice) {
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priceForEstimation = maxGasPrice
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}
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const {
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closestLowerValueIndex,
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closestHigherValueIndex,
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closestHigherValue,
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closestLowerValue,
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} = getAdjacentGasPrices({ gasPrices, priceToPosition: priceForEstimation })
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const newTimeEstimate = extrapolateY({
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higherY: estimatedTimes[closestHigherValueIndex],
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lowerY: estimatedTimes[closestLowerValueIndex],
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higherX: closestHigherValue,
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lowerX: closestLowerValue,
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xForExtrapolation: priceForEstimation,
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})
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return {
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newTimeEstimate,
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minGasPrice,
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maxGasPrice,
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}
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}
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export function getRenderableTimeEstimate (currentGasPrice, gasPrices, estimatedTimes) {
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const {
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newTimeEstimate,
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minGasPrice,
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maxGasPrice,
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} = getRawTimeEstimateData(currentGasPrice, gasPrices, estimatedTimes)
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return formatTimeEstimate(newTimeEstimate, currentGasPrice > maxGasPrice, currentGasPrice < minGasPrice)
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}
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