ducky/devices
2015-11-12
ducky/devices/vendor/code.google.com/p/go-uuid/uuid/version4.go
Initial attempt. Create the basic types (Device, DeviceType, DeviceChange) that we'll be using in the service. Also, create our Storer interface, and the helper methods to store, retrieve, and update information in the datastore. Also, we're using Godep, so check in our Godeps folder and the vendor folder. Note that this only works on Go 1.5 and later, with the GO15VENDOREXPERIMENT environment variable set to 1.
| paddy@0 | 1 // Copyright 2011 Google Inc. All rights reserved. |
| paddy@0 | 2 // Use of this source code is governed by a BSD-style |
| paddy@0 | 3 // license that can be found in the LICENSE file. |
| paddy@0 | 4 |
| paddy@0 | 5 package uuid |
| paddy@0 | 6 |
| paddy@0 | 7 // Random returns a Random (Version 4) UUID or panics. |
| paddy@0 | 8 // |
| paddy@0 | 9 // The strength of the UUIDs is based on the strength of the crypto/rand |
| paddy@0 | 10 // package. |
| paddy@0 | 11 // |
| paddy@0 | 12 // A note about uniqueness derived from from the UUID Wikipedia entry: |
| paddy@0 | 13 // |
| paddy@0 | 14 // Randomly generated UUIDs have 122 random bits. One's annual risk of being |
| paddy@0 | 15 // hit by a meteorite is estimated to be one chance in 17 billion, that |
| paddy@0 | 16 // means the probability is about 0.00000000006 (6 × 10−11), |
| paddy@0 | 17 // equivalent to the odds of creating a few tens of trillions of UUIDs in a |
| paddy@0 | 18 // year and having one duplicate. |
| paddy@0 | 19 func NewRandom() UUID { |
| paddy@0 | 20 uuid := make([]byte, 16) |
| paddy@0 | 21 randomBits([]byte(uuid)) |
| paddy@0 | 22 uuid[6] = (uuid[6] & 0x0f) | 0x40 // Version 4 |
| paddy@0 | 23 uuid[8] = (uuid[8] & 0x3f) | 0x80 // Variant is 10 |
| paddy@0 | 24 return uuid |
| paddy@0 | 25 } |