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67 lines
2.7 KiB
Markdown
67 lines
2.7 KiB
Markdown
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# NUID
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[](http://opensource.org/licenses/MIT)
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[](http://goreportcard.com/report/nats-io/nuid)
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[](http://travis-ci.org/nats-io/nuid)
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[](https://github.com/nats-io/nuid/releases/tag/v1.0.0)
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[](http://godoc.org/github.com/nats-io/nuid)
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[](https://coveralls.io/github/nats-io/nuid?branch=master)
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A highly performant unique identifier generator.
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## Installation
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Use the `go` command:
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$ go get github.com/nats-io/nuid
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## Basic Usage
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```go
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// Utilize the global locked instance
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nuid := nuid.Next()
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// Create an instance, these are not locked.
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n := nuid.New()
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nuid = n.Next()
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// Generate a new crypto/rand seeded prefix.
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// Generally not needed, happens automatically.
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n.RandomizePrefix()
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```
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## Performance
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NUID needs to be very fast to generate and be truly unique, all while being entropy pool friendly.
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NUID uses 12 bytes of crypto generated data (entropy draining), and 10 bytes of pseudo-random
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sequential data that increments with a pseudo-random increment.
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Total length of a NUID string is 22 bytes of base 36 ascii text, so 36^22 or
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17324272922341479351919144385642496 possibilities.
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NUID can generate identifiers as fast as 60ns, or ~16 million per second. There is an associated
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benchmark you can use to test performance on your own hardware.
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## License
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(The MIT License)
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Copyright (c) 2016 Apcera Inc.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to
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deal in the Software without restriction, including without limitation the
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rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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sell copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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IN THE SOFTWARE.
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