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// Package util provides auxiliary functions internally used in webrtc package
package util
import (
"errors"
"strings"
"github.com/pion/randutil"
)
const (
runesAlpha = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
)
// Use global random generator to properly seed by crypto grade random.
var globalMathRandomGenerator = randutil.NewMathRandomGenerator() // nolint:gochecknoglobals
// MathRandAlpha generates a mathmatical random alphabet sequence of the requested length.
func MathRandAlpha(n int) string {
return globalMathRandomGenerator.GenerateString(n, runesAlpha)
}
// RandUint32 generates a mathmatical random uint32.
func RandUint32() uint32 {
return globalMathRandomGenerator.Uint32()
}
// FlattenErrs flattens multiple errors into one
func FlattenErrs(errs []error) error {
errs2 := []error{}
for _, e := range errs {
if e != nil {
errs2 = append(errs2, e)
}
}
if len(errs2) == 0 {
return nil
}
return multiError(errs2)
}
type multiError []error
func (me multiError) Error() string {
var errstrings []string
for _, err := range me {
if err != nil {
errstrings = append(errstrings, err.Error())
}
}
if len(errstrings) == 0 {
return "multiError must contain multiple error but is empty"
}
return strings.Join(errstrings, "\n")
}
func (me multiError) Is(err error) bool {
for _, e := range me {
if errors.Is(e, err) {
return true
}
if me2, ok := e.(multiError); ok {
if me2.Is(err) {
return true
}
}
}
return false
}
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