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Code Issues Releases Activity

rand func modify

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This commit is contained in:
JessonChan 2016-04-08 14:24:23 +08:00
parent ed0e6419f0
commit 53d680a493
2 changed files with 43 additions and 14 deletions
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20
utils/rand.go
View File

@ -20,29 +20,25 @@ import (
"time" "time"
) )
var alphaNum = []byte(`0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz`)
// RandomCreateBytes generate random []byte by specify chars. // RandomCreateBytes generate random []byte by specify chars.
func RandomCreateBytes(n int, alphabets ...byte) []byte { func RandomCreateBytes(n int, alphabets ...byte) []byte {
const alphanum = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" if len(alphabets) == 0 {
alphabets = alphaNum
}
var bytes = make([]byte, n) var bytes = make([]byte, n)
var randby bool var randBy bool
if num, err := rand.Read(bytes); num != n || err != nil { if num, err := rand.Read(bytes); num != n || err != nil {
r.Seed(time.Now().UnixNano()) r.Seed(time.Now().UnixNano())
randby = true randBy = true
} }
for i, b := range bytes { for i, b := range bytes {
if len(alphabets) == 0 { if randBy {
if randby {
bytes[i] = alphanum[r.Intn(len(alphanum))]
} else {
bytes[i] = alphanum[b%byte(len(alphanum))]
}
} else {
if randby {
bytes[i] = alphabets[r.Intn(len(alphabets))] bytes[i] = alphabets[r.Intn(len(alphabets))]
} else { } else {
bytes[i] = alphabets[b%byte(len(alphabets))] bytes[i] = alphabets[b%byte(len(alphabets))]
} }
} }
}
return bytes return bytes
} }

33
utils/rand_test.go Normal file
View File

@ -0,0 +1,33 @@
// Copyright 2016 beego Author. All Rights Reserved.
//
// 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 utils
import "testing"
func TestRand_01(t *testing.T) {
bs0 := RandomCreateBytes(16)
bs1 := RandomCreateBytes(16)
t.Log(string(bs0), string(bs1))
if string(bs0) == string(bs1) {
t.FailNow()
}
bs0 = RandomCreateBytes(4, []byte(`a`)...)
if string(bs0) != "aaaa" {
t.FailNow()
}
}