wide/util/rand.go

48 lines
1.2 KiB
Go

// Copyright (c) 2014-2018, b3log.org & hacpai.com
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package util
import (
"math/rand"
"time"
)
type myrand struct{}
// Random utilities.
var Rand = myrand{}
// String returns a random string ['a', 'z'] in the specified length
func (*myrand) String(length int) string {
bytes := make([]byte, length)
for i := 0; i < length; i++ {
bytes[i] = byte(Rand.Int('a', 'z'))
time.Sleep(100 * time.Nanosecond)
}
return string(bytes)
}
// Int returns a random integer in range [min, max].
func (*myrand) Int(min int, max int) int {
rand.Seed(time.Now().UnixNano())
time.Sleep(100 * time.Nanosecond)
return min + rand.Intn(max-min)
}