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helpers.go
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helpers.go
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/*
*
* k6 - a next-generation load testing tool
* Copyright (C) 2019 Load Impact
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package pb
import (
"math"
"strconv"
"time"
)
// GetFixedLengthIntFormat returns "%0__d" format argument for fmt functions
// that will produce a base-10 right-aligned zero-padded string representation
// of the supplied integer value. The number of characters (i.e. the actual
// number + how many zeros it will be padded on the left with) in the returned
// string corresponds to the number of digits in the supplied maxValue.
func GetFixedLengthIntFormat(maxValue int64) (formatStr string) {
resLen := 1
if maxValue < 0 {
resLen++
}
for maxValue /= 10; maxValue != 0; maxValue /= 10 {
resLen++
}
return "%0" + strconv.Itoa(resLen) + "d"
}
// GetFixedLengthFloatFormat returns "%0__.__f" format argument for fmt
// functions that will produce a base-10 right-aligned zero-padded string
// representation of the supplied float value, with the specified decimal
// precision. The number of characters (i.e. the actual number + maybe dot and
// precision + how many zeros it will be padded on the left with) in the
// returned string corresponds to the number of digits in the supplied maxValue
// and the desired precision.
func GetFixedLengthFloatFormat(maxValue float64, precision uint) (formatStr string) {
resLen := 1
if maxValue < 0 {
maxValue = -maxValue
resLen++
}
if maxValue >= 10 {
resLen += int(math.Log10(maxValue))
}
if precision > 0 {
resLen += int(precision + 1)
}
return "%0" + strconv.Itoa(resLen) + "." + strconv.Itoa(int(precision)) + "f"
}
// GetFixedLengthDuration takes a *positive* duration and its max value and
// returns a string with a fixed width so we can prevent UI elements jumping
// around. The format is "___d__h__m__s.s", but leading values can be omitted
// based on the maxDuration value, the results can be: "___h__m__s.s".
//
// This is code was inspired by the Go stdlib's time.Duration.String() code.
// TODO: more flexibility - negative values or variable precision?
func GetFixedLengthDuration(d, maxDuration time.Duration) (result string) {
const rounding = 100 * time.Millisecond
if d < 0 {
d = -d
}
if maxDuration < 0 {
maxDuration = -maxDuration
}
if maxDuration < d {
maxDuration = d
}
maxDuration = maxDuration.Round(rounding)
// Largest time is "106751d23h47m16.9s", i.e. time.Duration(math.MaxInt64)
// Positions: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
buf := [18]byte{'0', '0', '0', '0', '0', '0', 'd', '0', '0', 'h', '0', '0', 'm', '0', '0', '.', '0', 's'}
u := uint64(d.Round(rounding) / (rounding))
u, buf[16] = u/10, byte(u%10)+'0'
u, buf[14] = u/10, byte(u%10)+'0'
if maxDuration < 10*time.Second {
return string(buf[14:])
}
u, buf[13] = u/6, byte(u%6)+'0'
if maxDuration < time.Minute {
return string(buf[13:])
}
u, buf[11] = u/10, byte(u%10)+'0'
if maxDuration < 10*time.Minute {
return string(buf[11:])
}
u, buf[10] = u/6, byte(u%6)+'0'
if maxDuration < time.Hour {
return string(buf[10:])
}
u, h := u/24, u%24
buf[7], buf[8] = byte(h/10)+'0', byte(h%10)+'0'
if maxDuration < 10*time.Hour {
return string(buf[8:])
} else if maxDuration < 24*time.Hour {
return string(buf[7:])
}
u, buf[5] = u/10, byte(u%10)+'0'
remDayPowers := maxDuration / (240 * time.Hour)
i := 5
for remDayPowers > 0 {
i--
u, buf[i] = u/10, byte(u%10)+'0'
remDayPowers /= 10
}
return string(buf[i:])
}
// Clampf returns the given value, "clamped" to the range [min, max].
// This is copied from lib/util.go to avoid circular imports.
func Clampf(val, min, max float64) float64 {
switch {
case val < min:
return min
case val > max:
return max
default:
return val
}
}