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Go UUID implementation

This package provides RFC 4122 compliant UUIDs. It will generate the following:

Version 1: based on timestamp and MAC address
Version 3: based on MD5 hash
Version 4: based on cryptographically secure random numbers
Version 5: based on SHA-1 hash

Functions NewV1, NewV3, NewV4, NewV5, New, NewHex and Parse() for generating versions 3, 4 and 5 UUIDs are as specified in RFC 4122.

Requirements

Go 1.4, 1.3, 1.2 and tip supported.

Recent Changes

Removed use of OS Thread locking and runtime package requirement
Changed String() output to CleanHyphen to match the canonical standard
Plenty of minor change and housekeeping
Removed default saver and replaced with interface
API changes to simplify use.
Added formatting support for user defined formats
Added support for Google App Engine
Variant type bits are now set correctly
Variant type can now be retrieved more efficiently
New tests for variant setting to confirm correctness
New tests added to confirm proper version setting
Type UUID change to UUIDArray for V3-5 UUIDs and UUIDStruct added for V1 UUIDs ** These implement the BinaryMarshaller and BinaryUnmarshaller interfaces
New was added to create a base UUID from a []byte slice - this uses UUIDArray
ParseHex was renamed to ParseUUID
NewHex now performs unsafe creation of UUID from a hex string
NewV3 and NewV5 now take anything that implements the Stringer interface
V1 UUIDs can now be created
The printing format can be changed

Installation

Use the go tool:

$ go get github.com/twinj/uuid

Usage

See documentation and examples for more information.

var config = uuid.StateSaverConfig{SaveReport: true, SaveSchedule: 30 * time.Minute}
uuid.SetupFileSystemStateSaver(config)

u1 := uuid.NewV1()
uP, _ := uuid.Parse("6ba7b810-9dad-11d1-80b4-00c04fd430c8")
u3 := uuid.NewV3(uP, uuid.Name("test"))
u4 := uuid.NewV4()
fmt.Printf(print, u4.Version(), u4.Variant(), u4)

u5 := uuid.NewV5(uuid.NamespaceURL, uuid.Name("test"))

if uuid.Equal(u1, u3) {
	fmt.Printf("Will never happen")
}
fmt.Printf(uuid.Formatter(u5, uuid.CurlyHyphen))

uuid.SwitchFormat(uuid.BracketHyphen)

Copyright

This is a derivative work

Also see: Algorithm details in RFC 4122.

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