| /* |
| Licensed to the Apache Software Foundation (ASF) under one |
| or more contributor license agreements. See the NOTICE file |
| distributed with this work for additional information |
| regarding copyright ownership. The ASF licenses this file |
| to you 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 proton |
| |
| import ( |
| "fmt" |
| "math/rand" |
| "sync" |
| "time" |
| ) |
| |
| // UUID is a 16-byte Universally Unique Identifier |
| type UUID [16]byte |
| |
| // String gives a UUID in standard string format. |
| func (u UUID) String() string { |
| return fmt.Sprintf("%X-%X-%X-%X-%X", u[0:4], u[4:6], u[6:8], u[8:10], u[10:]) |
| } |
| |
| // Don't mess with the default random source. |
| var randomSource = rand.NewSource(time.Now().UnixNano()) |
| var randomLock sync.Mutex |
| |
| func random() byte { |
| randomLock.Lock() |
| defer randomLock.Unlock() |
| return byte(randomSource.Int63()) |
| } |
| |
| // UUID4 returns a randomly-generated (version 4) UUID, as per RFC4122 |
| func UUID4() UUID { |
| var u UUID |
| for i := 0; i < len(u); i++ { |
| u[i] = random() |
| } |
| // See /https://tools.ietf.org/html/rfc4122#section-4.4 |
| u[6] = (u[6] & 0x0F) | 0x40 // Version bits to 4 |
| u[8] = (u[8] & 0x3F) | 0x80 // Reserved bits (top two) set to 01 |
| return u |
| } |