wide/util/rand.go

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// Copyright (c) 2015, b3log.org
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//
// 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
//
// http://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
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import (
"math/rand"
"time"
)
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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)
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for i := 0; i < length; i++ {
bytes[i] = byte(Rand.Int('a', 'z'))
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time.Sleep(100 * time.Nanosecond)
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}
return string(bytes)
}
// Int returns a random integer in range [min, max].
func (*myrand) Int(min int, max int) int {
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rand.Seed(time.Now().UnixNano())
time.Sleep(100 * time.Nanosecond)
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return min + rand.Intn(max-min)
}