55 lines
1.4 KiB
Go
55 lines
1.4 KiB
Go
// Copyright 2018 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package stringutil
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import (
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"math/rand"
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"time"
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)
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// UniqueStrings returns a slice of randomly generated unique strings.
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func UniqueStrings(slen uint, n int) (ss []string) {
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exist := make(map[string]struct{})
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ss = make([]string, 0, n)
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for len(ss) < n {
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s := randString(slen)
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if _, ok := exist[s]; !ok {
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ss = append(ss, s)
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exist[s] = struct{}{}
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}
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}
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return ss
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}
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// RandomStrings returns a slice of randomly generated strings.
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func RandomStrings(slen uint, n int) (ss []string) {
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ss = make([]string, 0, n)
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for i := 0; i < n; i++ {
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ss = append(ss, randString(slen))
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}
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return ss
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}
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const chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
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func randString(l uint) string {
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rand.Seed(time.Now().UnixNano())
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s := make([]byte, l)
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for i := 0; i < int(l); i++ {
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s[i] = chars[rand.Intn(len(chars))]
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}
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return string(s)
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}
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