Bring your own LUA scripts into redis

Add this line to your application's Gemfile:

gem 'brpoplpush-redis_script'

And then execute:

bundle

Or install it yourself as:

gem install brpoplpush-redis_script

If you want to avoid global state in your project/gem the recommended way to use RedisScript is the following way.

Include the DSL module from the gem and configure with a path. We don't believe it is a good idea to put all your lua files in a single directory. We rather believe that these scripts should be placed and organized by feature.

Let's take sidekiq-unique-jobs for example. It uses brpoplpush-redis_script like follows:

# lib/my_redis_scripts.rb
require "brpoplpush/redis_script"

module SidekiqUniqueJobs::Scripts
  include Brpoplpush::RedisScript::DSL

  configure do |config|
    config.scripts_path = Rails.root.join("app", "lua")
  end
end

SidekiqUniqueJobs::Scripts.execute(:lock, Redis.new, keys: ["key1", "key2"] argv: ["bogus"])
# => 1

SidekiqUniqueJobs::Scripts.execute(:lock, Redis.new, keys: ["key1", "key1"] argv: ["bogus"])
# => -1

-- app/lua/lock.lua

local key_one = KEYS[1]
local key_two = KEYS[2]

local locked_val = ARGV[1]

if not key_one == key_two then
  redis.call("SET", key_two, )
  return 1
end

return -1

This is a very simplified version of course.

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

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.

Bug reports and pull requests are welcome on GitHub at https://github.com/bropoplpush/brpoplpush-redis_script. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

The gem is available as open source under the terms of the MIT License.

Everyone interacting in the Brpoplpush::RedisScript project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.