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/*
* This file is part of Go Responsiveness.
*
* Go Responsiveness is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software Foundation,
* either version 3 of the License, or (at your option) any later version.
* Go Responsiveness 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with Foobar. If not, see <https://www.gnu.org/licenses/>.
*/
package utilities
import (
"fmt"
"math"
"math/rand"
"os"
"reflect"
"sync/atomic"
"time"
)
func IsInterfaceNil(ifc interface{}) bool {
return ifc == nil ||
(reflect.ValueOf(ifc).Kind() == reflect.Ptr && reflect.ValueOf(ifc).IsNil())
}
func SignedPercentDifference(
current float64,
previous float64,
) (difference float64) {
//return ((current - previous) / (float64(current+previous) / 2.0)) * float64(
//100,
// )
return ((current - previous) / previous) * float64(
100,
)
}
func AbsPercentDifference(
current float64,
previous float64,
) (difference float64) {
return (math.Abs(current-previous) / (float64(current+previous) / 2.0)) * float64(
100,
)
}
func Conditional(condition bool, t string, f string) string {
if condition {
return t
}
return f
}
func ToMbps(bytes float64) float64 {
return ToMBps(bytes) * float64(8)
}
func ToMBps(bytes float64) float64 {
return float64(bytes) / float64(1024*1024)
}
type MeasurementResult struct {
Delay time.Duration
MeasurementCount uint16
Err error
}
func SeekForAppend(file *os.File) (err error) {
_, err = file.Seek(0, 2)
return
}
var GenerateConnectionId func() uint64 = func() func() uint64 {
var nextConnectionId uint64 = 0
return func() uint64 {
return atomic.AddUint64(&nextConnectionId, 1)
}
}()
type Optional[S any] struct {
value S
some bool
}
func Some[S any](value S) Optional[S] {
return Optional[S]{value: value, some: true}
}
func None[S any]() Optional[S] {
return Optional[S]{some: false}
}
func IsNone[S any](optional Optional[S]) bool {
return !optional.some
}
func IsSome[S any](optional Optional[S]) bool {
return optional.some
}
func GetSome[S any](optional Optional[S]) S {
if !optional.some {
panic("Attempting to access Some of a None.")
}
return optional.value
}
func (optional Optional[S]) String() string {
if IsSome(optional) {
return fmt.Sprintf("Some: %v", optional.some)
} else {
return "None"
}
}
func RandBetween(max int) int {
return rand.New(rand.NewSource(int64(time.Now().Nanosecond()))).Int() % max
}
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