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vsphere-influxdb-go/vendor/github.com/influxdata/influxdb/uuid/uuid.go
2017-10-25 20:52:40 +00:00

97 lines
3.4 KiB
Go

// Copyright (c) 2012 The gocql Authors. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// The uuid package can be used to generate and parse universally unique
// identifiers, a standardized format in the form of a 128 bit number.
//
// http://tools.ietf.org/html/rfc4122
// Package uuid provides functions to create time-based UUIDs.
package uuid // import "github.com/influxdata/influxdb/uuid"
import (
"sync/atomic"
"time"
)
// UUID - unique identifier type representing a 128 bit number
type UUID [16]byte
var timeBase = time.Date(1582, time.October, 15, 0, 0, 0, 0, time.UTC).Unix()
var hardwareAddr []byte
var clockSeq uint32
// TimeUUID generates a new time based UUID (version 1) using the current
// time as the timestamp.
func TimeUUID() UUID {
return FromTime(time.Now())
}
// FromTime generates a new time based UUID (version 1) as described in
// RFC 4122. This UUID contains the MAC address of the node that generated
// the UUID, the given timestamp and a sequence number.
func FromTime(aTime time.Time) UUID {
var u UUID
utcTime := aTime.In(time.UTC)
t := uint64(utcTime.Unix()-timeBase)*10000000 + uint64(utcTime.Nanosecond()/100)
u[0], u[1], u[2], u[3] = byte(t>>24), byte(t>>16), byte(t>>8), byte(t)
u[4], u[5] = byte(t>>40), byte(t>>32)
u[6], u[7] = byte(t>>56)&0x0F, byte(t>>48)
clock := atomic.AddUint32(&clockSeq, 1)
u[8] = byte(clock >> 8)
u[9] = byte(clock)
copy(u[10:], hardwareAddr)
u[6] |= 0x10 // set version to 1 (time based uuid)
u[8] &= 0x3F // clear variant
u[8] |= 0x80 // set to IETF variant
return u
}
// String returns the UUID in it's canonical form, a 32 digit hexadecimal
// number in the form of xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.
func (u UUID) String() string {
var offsets = [...]int{0, 2, 4, 6, 9, 11, 14, 16, 19, 21, 24, 26, 28, 30, 32, 34}
const hexString = "0123456789abcdef"
r := make([]byte, 36)
for i, b := range u {
r[offsets[i]] = hexString[b>>4]
r[offsets[i]+1] = hexString[b&0xF]
}
r[8] = '-'
r[13] = '-'
r[18] = '-'
r[23] = '-'
return string(r)
}