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randsource.go
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/
randsource.go
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/*
*
* k6 - a next-generation load testing tool
* Copyright (C) 2016 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 common
import (
crand "crypto/rand"
"encoding/binary"
"fmt"
"math/rand"
"github.com/dop251/goja"
)
// NewRandSource is copied from goja's source code:
// https://github.com/dop251/goja/blob/master/goja/main.go#L44
// The returned RandSource is NOT safe for concurrent use:
// https://golang.org/pkg/math/rand/#NewSource
func NewRandSource() goja.RandSource {
var seed int64
if err := binary.Read(crand.Reader, binary.LittleEndian, &seed); err != nil {
panic(fmt.Errorf("could not read random bytes: %v", err))
}
return rand.New(rand.NewSource(seed)).Float64
}