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-# Globally Unique ID Generator
-[![godoc](http://img.shields.io/badge/godoc-reference-blue.svg?style=flat)](https://godoc.org/github.com/rs/xid) [![license](http://img.shields.io/badge/license-MIT-red.svg?style=flat)](https://raw.githubusercontent.com/rs/xid/master/LICENSE) [![Build Status](https://travis-ci.org/rs/xid.svg?branch=master)](https://travis-ci.org/rs/xid) [![Coverage](http://gocover.io/_badge/github.com/rs/xid)](http://gocover.io/github.com/rs/xid)
-Package xid is a globally unique id generator library, ready to safely be used directly in your server code.
-Xid uses the Mongo Object ID algorithm to generate globally unique ids with a different serialization (base64) to make it shorter when transported as a string:
-https://docs.mongodb.org/manual/reference/object-id/
- 4-byte value representing the seconds since the Unix epoch,
- 3-byte machine identifier,
- 2-byte process id, and
- 3-byte counter, starting with a random value.
-The binary representation of the id is compatible with Mongo 12 bytes Object IDs.
-The string representation is using base32 hex (w/o padding) for better space efficiency
-when stored in that form (20 bytes). The hex variant of base32 is used to retain the
-sortable property of the id.
-Xid doesn't use base64 because case sensitivity and the 2 non alphanum chars may be an
-issue when transported as a string between various systems. Base36 wasn't retained either
-because 1/ it's not standard 2/ the resulting size is not predictable (not bit aligned)
-and 3/ it would not remain sortable. To validate a base32 `xid`, expect a 20 chars long,
-all lowercase sequence of `a` to `v` letters and `0` to `9` numbers (`[0-9a-v]{20}`).
-UUIDs are 16 bytes (128 bits) and 36 chars as string representation. Twitter Snowflake
-ids are 8 bytes (64 bits) but require machine/data-center configuration and/or central
-generator servers. xid stands in between with 12 bytes (96 bits) and a more compact
-URL-safe string representation (20 chars). No configuration or central generator server
-is required so it can be used directly in server's code.
-| Name        | Binary Size | String Size    | Features
-|-------------|-------------|----------------|----------------
-| [UUID]      | 16 bytes    | 36 chars       | configuration free, not sortable
-| [shortuuid] | 16 bytes    | 22 chars       | configuration free, not sortable
-| [Snowflake] | 8 bytes     | up to 20 chars | needs machine/DC configuration, needs central server, sortable
-| [MongoID]   | 12 bytes    | 24 chars       | configuration free, sortable
-| xid         | 12 bytes    | 20 chars       | configuration free, sortable
-[UUID]: https://en.wikipedia.org/wiki/Universally_unique_identifier
-[shortuuid]: https://github.com/stochastic-technologies/shortuuid
-[Snowflake]: https://blog.twitter.com/2010/announcing-snowflake
-[MongoID]: https://docs.mongodb.org/manual/reference/object-id/
-Features:
- Size: 12 bytes (96 bits), smaller than UUID, larger than snowflake
- Base32 hex encoded by default (20 chars when transported as printable string, still sortable)
- Non configured, you don't need set a unique machine and/or data center id
- K-ordered
- Embedded time with 1 second precision
- Unicity guaranteed for 16,777,216 (24 bits) unique ids per second and per host/process
- Lock-free (i.e.: unlike UUIDv1 and v2)
-Best used with [zerolog](https://github.com/rs/zerolog)'s
-[RequestIDHandler](https://godoc.org/github.com/rs/zerolog/hlog#RequestIDHandler).
-Notes:
- Xid is dependent on the system time, a monotonic counter and so is not cryptographically secure. If unpredictability of IDs is important, you should not use Xids. It is worth noting that most other UUID-like implementations are also not cryptographically secure. You should use libraries that rely on cryptographically secure sources (like /dev/urandom on unix, crypto/rand in golang), if you want a truly random ID generator.
-References:
- http://www.slideshare.net/davegardnerisme/unique-id-generation-in-distributed-systems
- https://en.wikipedia.org/wiki/Universally_unique_identifier
- https://blog.twitter.com/2010/announcing-snowflake
- Python port by [Graham Abbott](https://github.com/graham): https://github.com/graham/python_xid
- Scala port by [Egor Kolotaev](https://github.com/kolotaev): https://github.com/kolotaev/ride
- Rust port by [Jérôme Renard](https://github.com/jeromer/): https://github.com/jeromer/libxid
- Ruby port by [Valar](https://github.com/valarpirai/): https://github.com/valarpirai/ruby_xid
- Java port by [0xShamil](https://github.com/0xShamil/): https://github.com/0xShamil/java-xid
- Dart port by [Peter Bwire](https://github.com/pitabwire): https://pub.dev/packages/xid
- PostgreSQL port by [Rasmus Holm](https://github.com/crholm): https://github.com/modfin/pg-xid
- Swift port by [Uditha Atukorala](https://github.com/uditha-atukorala): https://github.com/uditha-atukorala/swift-xid
- C++ port by [Uditha Atukorala](https://github.com/uditha-atukorala): https://github.com/uditha-atukorala/libxid
-## Install
-    go get github.com/rs/xid
-## Usage
-```go
-guid := xid.New()
-println(guid.String())
-// Output: 9m4e2mr0ui3e8a215n4g
-```
-Get `xid` embedded info:
-```go
-guid.Machine()
-guid.Pid()
-guid.Time()
-guid.Counter()
-```
-## Benchmark
-Benchmark against Go [Maxim Bublis](https://github.com/satori)'s [UUID](https://github.com/satori/go.uuid).
-```
-BenchmarkXID            20000000                91.1 ns/op            32 B/op          1 allocs/op
-BenchmarkXID-2          20000000                55.9 ns/op            32 B/op          1 allocs/op
-BenchmarkXID-4          50000000                32.3 ns/op            32 B/op          1 allocs/op
-BenchmarkUUIDv1         10000000               204 ns/op              48 B/op          1 allocs/op
-BenchmarkUUIDv1-2       10000000               160 ns/op              48 B/op          1 allocs/op
-BenchmarkUUIDv1-4       10000000               195 ns/op              48 B/op          1 allocs/op
-BenchmarkUUIDv4          1000000              1503 ns/op              64 B/op          2 allocs/op
-BenchmarkUUIDv4-2        1000000              1427 ns/op              64 B/op          2 allocs/op
-BenchmarkUUIDv4-4        1000000              1452 ns/op              64 B/op          2 allocs/op
-```
-Note: UUIDv1 requires a global lock, hence the performance degradation as we add more CPUs.
-## Licenses
-All source code is licensed under the [MIT License](https://raw.github.com/rs/xid/master/LICENSE).

diff --git a/vendor/github.com/rs/xid/README.md b/vendor/github.com/rs/xid/README.md deleted file mode 100644 index 974e67d..0000000 --- a/vendor/github.com/rs/xid/README.md +++ /dev/null
@@ -1,119 +0,0 @@
1	# Globally Unique ID Generator
2
3	[![godoc](http://img.shields.io/badge/godoc-reference-blue.svg?style=flat)](https://godoc.org/github.com/rs/xid) [![license](http://img.shields.io/badge/license-MIT-red.svg?style=flat)](https://raw.githubusercontent.com/rs/xid/master/LICENSE) [![Build Status](https://travis-ci.org/rs/xid.svg?branch=master)](https://travis-ci.org/rs/xid) [![Coverage](http://gocover.io/_badge/github.com/rs/xid)](http://gocover.io/github.com/rs/xid)
4
5	Package xid is a globally unique id generator library, ready to safely be used directly in your server code.
6
7	Xid uses the Mongo Object ID algorithm to generate globally unique ids with a different serialization (base64) to make it shorter when transported as a string:
8	https://docs.mongodb.org/manual/reference/object-id/
9
10	- 4-byte value representing the seconds since the Unix epoch,
11	- 3-byte machine identifier,
12	- 2-byte process id, and
13	- 3-byte counter, starting with a random value.
14
15	The binary representation of the id is compatible with Mongo 12 bytes Object IDs.
16	The string representation is using base32 hex (w/o padding) for better space efficiency
17	when stored in that form (20 bytes). The hex variant of base32 is used to retain the
18	sortable property of the id.
19
20	Xid doesn't use base64 because case sensitivity and the 2 non alphanum chars may be an
21	issue when transported as a string between various systems. Base36 wasn't retained either
22	because 1/ it's not standard 2/ the resulting size is not predictable (not bit aligned)
23	and 3/ it would not remain sortable. To validate a base32 `xid`, expect a 20 chars long,
24	all lowercase sequence of `a` to `v` letters and `0` to `9` numbers (`[0-9a-v]{20}`).
25
26	UUIDs are 16 bytes (128 bits) and 36 chars as string representation. Twitter Snowflake
27	ids are 8 bytes (64 bits) but require machine/data-center configuration and/or central
28	generator servers. xid stands in between with 12 bytes (96 bits) and a more compact
29	URL-safe string representation (20 chars). No configuration or central generator server
30	is required so it can be used directly in server's code.
31
32	\| Name \| Binary Size \| String Size \| Features
33	\|-------------\|-------------\|----------------\|----------------
34	\| [UUID] \| 16 bytes \| 36 chars \| configuration free, not sortable
35	\| [shortuuid] \| 16 bytes \| 22 chars \| configuration free, not sortable
36	\| [Snowflake] \| 8 bytes \| up to 20 chars \| needs machine/DC configuration, needs central server, sortable
37	\| [MongoID] \| 12 bytes \| 24 chars \| configuration free, sortable
38	\| xid \| 12 bytes \| 20 chars \| configuration free, sortable
39
40	[UUID]: https://en.wikipedia.org/wiki/Universally_unique_identifier
41	[shortuuid]: https://github.com/stochastic-technologies/shortuuid
42	[Snowflake]: https://blog.twitter.com/2010/announcing-snowflake
43	[MongoID]: https://docs.mongodb.org/manual/reference/object-id/
44
45	Features:
46
47	- Size: 12 bytes (96 bits), smaller than UUID, larger than snowflake
48	- Base32 hex encoded by default (20 chars when transported as printable string, still sortable)
49	- Non configured, you don't need set a unique machine and/or data center id
50	- K-ordered
51	- Embedded time with 1 second precision
52	- Unicity guaranteed for 16,777,216 (24 bits) unique ids per second and per host/process
53	- Lock-free (i.e.: unlike UUIDv1 and v2)
54
55	Best used with [zerolog](https://github.com/rs/zerolog)'s
56	[RequestIDHandler](https://godoc.org/github.com/rs/zerolog/hlog#RequestIDHandler).
57
58	Notes:
59
60	- Xid is dependent on the system time, a monotonic counter and so is not cryptographically secure. If unpredictability of IDs is important, you should not use Xids. It is worth noting that most other UUID-like implementations are also not cryptographically secure. You should use libraries that rely on cryptographically secure sources (like /dev/urandom on unix, crypto/rand in golang), if you want a truly random ID generator.
61
62	References:
63
64	- http://www.slideshare.net/davegardnerisme/unique-id-generation-in-distributed-systems
65	- https://en.wikipedia.org/wiki/Universally_unique_identifier
66	- https://blog.twitter.com/2010/announcing-snowflake
67	- Python port by [Graham Abbott](https://github.com/graham): https://github.com/graham/python_xid
68	- Scala port by [Egor Kolotaev](https://github.com/kolotaev): https://github.com/kolotaev/ride
69	- Rust port by [Jérôme Renard](https://github.com/jeromer/): https://github.com/jeromer/libxid
70	- Ruby port by [Valar](https://github.com/valarpirai/): https://github.com/valarpirai/ruby_xid
71	- Java port by [0xShamil](https://github.com/0xShamil/): https://github.com/0xShamil/java-xid
72	- Dart port by [Peter Bwire](https://github.com/pitabwire): https://pub.dev/packages/xid
73	- PostgreSQL port by [Rasmus Holm](https://github.com/crholm): https://github.com/modfin/pg-xid
74	- Swift port by [Uditha Atukorala](https://github.com/uditha-atukorala): https://github.com/uditha-atukorala/swift-xid
75	- C++ port by [Uditha Atukorala](https://github.com/uditha-atukorala): https://github.com/uditha-atukorala/libxid
76
77	## Install
78
79	go get github.com/rs/xid
80
81	## Usage
82
83	```go
84	guid := xid.New()
85
86	println(guid.String())
87	// Output: 9m4e2mr0ui3e8a215n4g
88	```
89
90	Get `xid` embedded info:
91
92	```go
93	guid.Machine()
94	guid.Pid()
95	guid.Time()
96	guid.Counter()
97	```
98
99	## Benchmark
100
101	Benchmark against Go [Maxim Bublis](https://github.com/satori)'s [UUID](https://github.com/satori/go.uuid).
102
103	```
104	BenchmarkXID 20000000 91.1 ns/op 32 B/op 1 allocs/op
105	BenchmarkXID-2 20000000 55.9 ns/op 32 B/op 1 allocs/op
106	BenchmarkXID-4 50000000 32.3 ns/op 32 B/op 1 allocs/op
107	BenchmarkUUIDv1 10000000 204 ns/op 48 B/op 1 allocs/op
108	BenchmarkUUIDv1-2 10000000 160 ns/op 48 B/op 1 allocs/op
109	BenchmarkUUIDv1-4 10000000 195 ns/op 48 B/op 1 allocs/op
110	BenchmarkUUIDv4 1000000 1503 ns/op 64 B/op 2 allocs/op
111	BenchmarkUUIDv4-2 1000000 1427 ns/op 64 B/op 2 allocs/op
112	BenchmarkUUIDv4-4 1000000 1452 ns/op 64 B/op 2 allocs/op
113	```
114
115	Note: UUIDv1 requires a global lock, hence the performance degradation as we add more CPUs.
116
117	## Licenses
118
119	All source code is licensed under the [MIT License](https://raw.github.com/rs/xid/master/LICENSE).