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// Copyright 2018 The etcd Authors
//
// 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 stringutil
import (
"math/rand"
"time"
)
// UniqueStrings returns a slice of randomly generated unique strings.
func UniqueStrings(slen uint, n int) (ss []string) {
exist := make(map[string]struct{})
ss = make([]string, 0, n)
for len(ss) < n {
s := RandString(slen)
if _, ok := exist[s]; !ok {
ss = append(ss, s)
exist[s] = struct{}{}
}
}
return ss
}
// RandomStrings returns a slice of randomly generated strings.
func RandomStrings(slen uint, n int) (ss []string) {
ss = make([]string, 0, n)
for i := 0; i < n; i++ {
ss = append(ss, RandString(slen))
}
return ss
}
const chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
func RandString(l uint) string {
rand.Seed(time.Now().UnixNano())
s := make([]byte, l)
for i := 0; i < int(l); i++ {
s[i] = chars[rand.Intn(len(chars))]
}
return string(s)
}
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