React

React is a simple application that allows for remote execution of commands, and it uses Redis as a queue.

Inspiration

It's inspired by Simon Willison's example of "Queue-activated shell scripts" in his redis tutorial:

while [ 1 ] do
  redis-cli blpop restart-httpd 0
  apache2ctl graceful
done

You can simply install React using rubygems:

sudo gem install react

Firs you have to prepare file with available commands. It can look like this:

# my_commands.yml
restart_httpd: apache2ctl graceful
restart_mysql: /etc/init.d/mysql restart
reboot: reboot

And now you can start a consumer.

react my_commands.yml

While your consumer is working, you can push any of specified command to
queue (default queue name is queue), eg:

redis-cli lpush queue restart_httpd
redis-cli lpush queue reboot

After that consumer will pick up enqueued command names from and execute related commands.

There are few more runtime options, which can be useful for you.

you can specify queue which will be consumed:

react my_commands.yml --queue "my:queue:name"
you can specify the database to which consumer should connect:

react my_commands.yml --host "yourhost.com" --port 6379 --db 2 --password pass
and finally, you can demonize the consumer:

react my_commands.yml --daemon

Fork the project.
Make your feature addition or bug fix.
Add tests for it. This is important so I don't break it in a future version unintentionally.
Commit, do not mess with rakefile, version, or history. (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
Send me a pull request. Bonus points for topic branches.

== Copyright

Copyleft 2010 Chris Kowalik. WTFPL Baby!

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