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Time based UUIDs useful as unique keys
branch: master

NewTimeBytes for stable UUID creation.

In order to use UUIDs as keys in Cassandra during a retried transaction,
use entropy provided by the caller so that the keys will intentionally
collide.
latest commit 6617b501e4
Sean Treadway authored

README.md

Simple UUIDs

Build Status

This implements a variant of Format 1 from RFC 4122 that is intended to be roughly sortable and play nicely as Cassandra TimeUUID keys. Much of the inspiration comes form having used ryanking's simple_uuid gem.

As the package implies, this is a simple UUID generator. It doesn't offer total sorting, monotonic increments or prevent timing collisions.

This package does offer a simple combination of random and time based uniqueness that will play nicely if you want a unique key from a Time object. If your time objects sort with a granularity of 100 nanoseconds then the UUIDs generated will have the same order. UUIDs with the same time have undefined order.

Other UUIDs

The other formats described in RFC 4122 should be parsable either in text or byte form, though will not be sortable or likely have a meaningful time componenet.

Contributions

Send a pull request with a tested go fmt change in a branch other than master. Do try to organize your commits to be atomic to the changes introduced.

License

Copyright (C) 2012 by Sean Treadway (streadway)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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