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https://github.com/kaspanet/kaspad.git
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387fade044
* Fix off by small amounts in sent amount kaspa Floating point math causes inconsistencies when converting kas to sompi. Use a method that parses the amount as a string, the converts it to sompi then parse back to uint64 * Deal with SendAmount as strings all the way * Consistent config handling * Set variables directly from utils.KasToSompi Use = instead of := to ensure no shadowing * Fix validate amount regex * Use decimal places as defined by constants Also check if SompiPerKaspa is multiple of 10 * Minor updates for context clarity
69 lines
1.7 KiB
Go
69 lines
1.7 KiB
Go
package utils
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import (
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"fmt"
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"math"
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"regexp"
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"strconv"
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"strings"
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"github.com/kaspanet/kaspad/domain/consensus/utils/constants"
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"github.com/pkg/errors"
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)
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// FormatKas takes the amount of sompis as uint64, and returns amount of KAS with 8 decimal places
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func FormatKas(amount uint64) string {
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res := " "
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if amount > 0 {
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res = fmt.Sprintf("%19.8f", float64(amount)/constants.SompiPerKaspa)
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}
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return res
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}
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// KasToSompi takes in a string representation of the Kas value to convert to Sompi
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func KasToSompi(amount string) (uint64, error) {
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err := validateKASAmountFormat(amount)
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if err != nil {
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return 0, err
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}
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// after validation, amount can only be either an int OR
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// a float with an int component and decimal places
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parts := strings.Split(amount, ".")
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amountStr := ""
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if constants.SompiPerKaspa%10 != 0 {
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return 0, errors.Errorf("Unable to convert to sompi when SompiPerKaspa is not a multiple of 10")
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}
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decimalPlaces := int(math.Log10(constants.SompiPerKaspa))
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decimalStr := ""
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if len(parts) == 2 {
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decimalStr = parts[1]
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}
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amountStr = fmt.Sprintf("%s%-*s", parts[0], decimalPlaces, decimalStr) // Padded with spaces at the end to fill for missing decimals: Sample "0.01234 "
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amountStr = strings.ReplaceAll(amountStr, " ", "0") // Make the spaces be 0s. Sample "0.012340000"
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convertedAmount, err := strconv.ParseUint(amountStr, 10, 64)
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return convertedAmount, err
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}
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func validateKASAmountFormat(amount string) error {
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// Check whether it's an integer, or a float with max 8 digits
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match, err := regexp.MatchString("^([1-9]\\d{0,11}|0)(\\.\\d{0,8})?$", amount)
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if !match {
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return errors.Errorf("Invalid amount")
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}
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if err != nil {
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return err
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}
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return nil
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}
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