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Cron jobs in Ruby

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README.rdoc

Introduction

Whenever is a Ruby gem that provides a clear syntax for writing and deploying cron jobs.

Installation

$ gem install whenever

Or with Bundler in your Gemfile.

gem 'whenever', :require => false

Getting started

$ cd /my/rails/app
$ wheneverize .

This will create an initial “config/schedule.rb” file you.

Example schedule.rb file

every 3.hours do
  runner "MyModel.some_process"       
  rake "my:rake:task"                 
  command "/usr/bin/my_great_command"
end

every 1.day, :at => '4:30 am' do 
  runner "MyModel.task_to_run_at_four_thirty_in_the_morning"
end

every :hour do # Many shortcuts available: :hour, :day, :month, :year, :reboot
  runner "SomeModel.ladeeda"
end

every :sunday, :at => '12pm' do # Use any day of the week or :weekend, :weekday 
  runner "Task.do_something_great"
end

More examples on the wiki: wiki.github.com/javan/whenever/instructions-and-examples

Define your own job types

Whenever ships with three pre-defined job types: command, runner, and rake. You can define your own with `job_type`.

For example:

job_type :awesome, '/usr/local/bin/awesome :task :fun_level'

every 2.hours do
  awesome "party", :fun_level => "extreme"
end

Would run `/usr/local/bin/awesome party extreme` every two hours. `:task` is always replaced with the first argument, and any additional `:whatevers` are replaced with the options passed in or by variables that have been defined with `set`.

The default job types that ship with Whenever are defined like so:

job_type :command, ":task :output"
job_type :rake,    "cd :path && RAILS_ENV=:environment rake :task :output"
job_type :runner,  "cd :path && script/runner -e :environment ':task' :output"

If a script/rails file is detected (like in a Rails 3 app), runner will be defined to fit:

job_type :runner,  "cd :path && script/rails runner -e :environment ':task' :output"

If a `:path` is not set it will default to the directory in which `whenever` was executed. `:environment` will default to 'production'. `:output` will be replaced with your output redirection settings which you can read more about here: github.com/javan/whenever/wiki/Output-redirection-(logging-your-cron-jobs)

All jobs are by default run with `bash -l -c 'command…'`. Among other things, this allows your cron jobs to play nice with RVM by loading the entire environment instead of cron's somewhat limited environment. Read more: blog.scoutapp.com/articles/2010/09/07/rvm-and-cron-in-production

You can change this by setting your own job_template.

set :job_template, "bash -l -c ':job'"

Or set the job_template to nil to have your jobs execute normally.

set :job_template, nil

And you'll see your schedule.rb converted to cron sytax. Note: running `whenever` with no options does not display your current crontab file, it simply shows you the output of converting your schedule.rb file.

Capistrano integration

Use the built-in Capistrano recipe for easy crontab updates with deploys.

In your “config/deploy.rb” file:

require "whenever/capistrano"

Take a look at the recipe for options you can set. github.com/javan/whenever/blob/master/lib/whenever/capistrano.rb For example, if you're using bundler do this:

set :whenever_command, "bundle exec whenever"
require "whenever/capistrano"

The `whenever` command

$ cd /my/rails/app
$ whenever

This will simply show you your schedule.rb file converted to cron syntax. It does not read or write your crontab file. Run `whenever –help` for a complete list of options.

Credit

Whenever was created for use at Inkling (inklingmarkets.com) where I work. Their take on it: blog.inklingmarkets.com/2009/02/whenever-easy-way-to-do-cron-jobs-from.html

While building Whenever, I learned a lot by digging through the source code of Capistrano - github.com/jamis/capistrano

Discussion / Feedback / Issues / Bugs

For general discussion and questions, please use the google group: groups.google.com/group/whenever-gem

If you've found a genuine bug or issue, please use the Issues section on github: github.com/javan/whenever/issues

Ryan Bates created a great Railscast about Whenever: railscasts.com/episodes/164-cron-in-ruby It's a little bit dated now, but remains a good introduction.

Credit

Whenever was created for use at Inkling (inklingmarkets.com) where I work. Their take on it: blog.inklingmarkets.com/2009/02/whenever-easy-way-to-do-cron-jobs-from.html

License

Copyright © 2009+ Javan Makhmali

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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