48 lines
1.8 KiB
Markdown
48 lines
1.8 KiB
Markdown
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# NUID
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[](https://www.apache.org/licenses/LICENSE-2.0)
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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/v1.0.1)
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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 62 ascii text, so 62^22 or
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2707803647802660400290261537185326956544 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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Unless otherwise noted, the NATS source files are distributed
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under the Apache Version 2.0 license found in the LICENSE file.
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