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Stanislav Nikitin
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# Compiled Object files, Static and Dynamic libs (Shared Objects)
*.o
*.a
*.so
# Folders
_obj
_test
# Architecture specific extensions/prefixes
*.[568vq]
[568vq].out
*.cgo1.go
*.cgo2.c
_cgo_defun.c
_cgo_gotypes.go
_cgo_export.*
_testmain.go
*.exe
*.test
*.prof

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language: go
sudo: false
go:
- 1.9.x
- 1.10.x
install:
- go get -t ./...
- go get github.com/mattn/goveralls
script:
- go fmt ./...
- go vet ./...
- go test -v
- go test -v --race
- go test -v -covermode=count -coverprofile=coverage.out
- $HOME/gopath/bin/goveralls -coverprofile coverage.out -service travis-ci

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# NATS NUID Governance
NATS NUID is part of the NATS project and is subject to the [NATS Governance](https://github.com/nats-io/nats-general/blob/master/GOVERNANCE.md).

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# Maintainers
Maintainership is on a per project basis.
### Core-maintainers
- Derek Collison <derek@nats.io> [@derekcollison](https://github.com/derekcollison)

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# NUID
[![License Apache 2](https://img.shields.io/badge/License-Apache2-blue.svg)](https://www.apache.org/licenses/LICENSE-2.0)
[![ReportCard](http://goreportcard.com/badge/nats-io/nuid)](http://goreportcard.com/report/nats-io/nuid)
[![Build Status](https://travis-ci.org/nats-io/nuid.svg?branch=master)](http://travis-ci.org/nats-io/nuid)
[![Release](https://img.shields.io/badge/release-v1.0.1-1eb0fc.svg)](https://github.com/nats-io/nuid/releases/tag/v1.0.1)
[![GoDoc](http://godoc.org/github.com/nats-io/nuid?status.png)](http://godoc.org/github.com/nats-io/nuid)
[![Coverage Status](https://coveralls.io/repos/github/nats-io/nuid/badge.svg?branch=master)](https://coveralls.io/github/nats-io/nuid?branch=master)
A highly performant unique identifier generator.
## Installation
Use the `go` command:
$ go get github.com/nats-io/nuid
## Basic Usage
```go
// Utilize the global locked instance
nuid := nuid.Next()
// Create an instance, these are not locked.
n := nuid.New()
nuid = n.Next()
// Generate a new crypto/rand seeded prefix.
// Generally not needed, happens automatically.
n.RandomizePrefix()
```
## Performance
NUID needs to be very fast to generate and be truly unique, all while being entropy pool friendly.
NUID uses 12 bytes of crypto generated data (entropy draining), and 10 bytes of pseudo-random
sequential data that increments with a pseudo-random increment.
Total length of a NUID string is 22 bytes of base 62 ascii text, so 62^22 or
2707803647802660400290261537185326956544 possibilities.
NUID can generate identifiers as fast as 60ns, or ~16 million per second. There is an associated
benchmark you can use to test performance on your own hardware.
## License
Unless otherwise noted, the NATS source files are distributed
under the Apache Version 2.0 license found in the LICENSE file.

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// Copyright 2016-2019 The NATS Authors
// Licensed 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.
// A unique identifier generator that is high performance, very fast, and tries to be entropy pool friendly.
package nuid
import (
"crypto/rand"
"fmt"
"math"
"math/big"
"sync"
"time"
prand "math/rand"
)
// NUID needs to be very fast to generate and truly unique, all while being entropy pool friendly.
// We will use 12 bytes of crypto generated data (entropy draining), and 10 bytes of sequential data
// that is started at a pseudo random number and increments with a pseudo-random increment.
// Total is 22 bytes of base 62 ascii text :)
// Version of the library
const Version = "1.0.1"
const (
digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
base = 62
preLen = 12
seqLen = 10
maxSeq = int64(839299365868340224) // base^seqLen == 62^10
minInc = int64(33)
maxInc = int64(333)
totalLen = preLen + seqLen
)
type NUID struct {
pre []byte
seq int64
inc int64
}
type lockedNUID struct {
sync.Mutex
*NUID
}
// Global NUID
var globalNUID *lockedNUID
// Seed sequential random with crypto or math/random and current time
// and generate crypto prefix.
func init() {
r, err := rand.Int(rand.Reader, big.NewInt(math.MaxInt64))
if err != nil {
prand.Seed(time.Now().UnixNano())
} else {
prand.Seed(r.Int64())
}
globalNUID = &lockedNUID{NUID: New()}
globalNUID.RandomizePrefix()
}
// New will generate a new NUID and properly initialize the prefix, sequential start, and sequential increment.
func New() *NUID {
n := &NUID{
seq: prand.Int63n(maxSeq),
inc: minInc + prand.Int63n(maxInc-minInc),
pre: make([]byte, preLen),
}
n.RandomizePrefix()
return n
}
// Generate the next NUID string from the global locked NUID instance.
func Next() string {
globalNUID.Lock()
nuid := globalNUID.Next()
globalNUID.Unlock()
return nuid
}
// Generate the next NUID string.
func (n *NUID) Next() string {
// Increment and capture.
n.seq += n.inc
if n.seq >= maxSeq {
n.RandomizePrefix()
n.resetSequential()
}
seq := n.seq
// Copy prefix
var b [totalLen]byte
bs := b[:preLen]
copy(bs, n.pre)
// copy in the seq in base62.
for i, l := len(b), seq; i > preLen; l /= base {
i -= 1
b[i] = digits[l%base]
}
return string(b[:])
}
// Resets the sequential portion of the NUID.
func (n *NUID) resetSequential() {
n.seq = prand.Int63n(maxSeq)
n.inc = minInc + prand.Int63n(maxInc-minInc)
}
// Generate a new prefix from crypto/rand.
// This call *can* drain entropy and will be called automatically when we exhaust the sequential range.
// Will panic if it gets an error from rand.Int()
func (n *NUID) RandomizePrefix() {
var cb [preLen]byte
cbs := cb[:]
if nb, err := rand.Read(cbs); nb != preLen || err != nil {
panic(fmt.Sprintf("nuid: failed generating crypto random number: %v\n", err))
}
for i := 0; i < preLen; i++ {
n.pre[i] = digits[int(cbs[i])%base]
}
}