github.com/zhyoulun/cilium@v1.6.12/pkg/testutils/rand_name.go (about)

     1  // Copyright 2016-2018 Authors of Cilium
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package testutils
    16  
    17  import (
    18  	"math/rand"
    19  	"time"
    20  )
    21  
    22  // Stolen from:
    23  // https://stackoverflow.com/questions/22892120/how-to-generate-a-random-string-of-a-fixed-length-in-golang
    24  func init() {
    25  	rand.Seed(time.Now().UnixNano())
    26  }
    27  
    28  var letterRunes = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
    29  
    30  // RandomRuneWithPrefix returns a random name string with fixed prefix
    31  func RandomRuneWithPrefix(prefix string, n int) string {
    32  	return prefix + RandomRuneWithLen(n)
    33  }
    34  
    35  // RandomRuneWithLen returns a random name of specified length
    36  func RandomRuneWithLen(n int) string {
    37  	b := make([]rune, n)
    38  	for i := range b {
    39  		b[i] = letterRunes[rand.Intn(len(letterRunes))]
    40  	}
    41  	return string(b)
    42  }
    43  
    44  // RandomRune returns a random name with a predefined length of 12
    45  func RandomRune() string {
    46  	return RandomRuneWithLen(12)
    47  }