Redis::Prescription

Redis LUA stored procedure runner. Preloads (and reloads when needed, e.g. when scripts were flushed away) script and then runs it with EVALSHA.

Installation

Add this line to your application's Gemfile:

gem "redis-prescription"

And then execute:

$ bundle

Or install it yourself as:

$ gem install redis-prescription

Usage

script = Redis::Prescription.new <<~LUA
  return tonumber(redis.call('GET', KEYS[1]) or 42)
LUA

script.eval(Redis.current, :xxx) # => 42

Redis.current.set(:xxx, 123)
script.eval(Redis.current, :xxx) # => 123

Supported Ruby Versions

This library aims to support and is [tested against][travis-ci] the following Ruby and Redis client versions:

• Ruby

  • 2.3.x
  • 2.4.x
  • 2.5.x

• redis-rb

  • 4.x

• redis-namespace

  • 1.6

If something doesn't work on one of these versions, it's a bug.

This library may inadvertently work (or seem to work) on other Ruby versions, however support will only be provided for the versions listed above.

If you would like this library to support another Ruby version or implementation, you may volunteer to be a maintainer. Being a maintainer entails making sure all tests run and pass on that implementation. When something breaks on your implementation, you will be responsible for providing patches in a timely fashion. If critical issues for a particular implementation exist at the time of a major release, support for that Ruby version may be dropped.

Development

After checking out the repo, run bundle install to install dependencies. Then, run bundle exec rake spec to run the tests with ruby-rb client.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

• Fork redis-prescription on GitHub
• Make your changes
• Ensure all tests pass (bundle exec rake)
• Send a pull request
• If we like them we'll merge them
• If we've accepted a patch, feel free to ask for commit access!

Copyright

Copyright (c) 2018 SensorTower Inc.
See LICENSE.md for further details.