Rack-Analytics

Rack-Analytics is a rack middleware that creates a log of all user requests to your application and saves them on a MongoDB database.

All requests are created on a separated thread, so it won't add a lot of overhead on each requests.

Installation on Rails 3

Add this line on your Gemfile:

    gem 'rack-analytics'

Run rails generate rack:analytics:install to install the initializer file on config/initializers/rack-analytics.rb. Some configuration options are highlighted on this file.

Then, on your config/application.rb, add the following line after inside your Application class:

    config.middlewares.insert_after Rack::Lock, Rack::Analytics::RequestLogger

Installation on another Rack applications

If you're using Bundler, you can add this line on your Gemfile:

    gem 'rack-analytics'

Then, run bundle to install the gem. If you don't use Bundler, you will need to install the gem manually with the following command:

    gem install rack-analytics

Either way, with the gem installed, you can add this on your config.ru:

    require 'rack/analytics'
    use Rack::Analytics::RequestLogger

It will do the trick, connecting to MongoDB and start to log all your requests. If you need to change some of the configuration of the database, you can do:

    require 'rack/analytics'

    # To change the database name only
    Rack::Analytics.db_name = 'mydb'

    # To change the database connection completely
    Rack::Analytics.db = Mongo::Connection.new.db 'mydb'

    use Rack::Analytics::RequestLogger

Rack-Analytics runs on a threaded environment, and just like db and db_name, you can set the Queue and the Thread for the parallelism with the keys queue and thread, respectively (i don't advise doing that, though).

You can also change the parser, to remove some of the fields (on the future, you'll be able to create your own fields based on the request headers):

    require 'rack/analytics'

    parser = Rack::Analytics::RequestParser.new

    # Will log only the path and time
    parser.only = ['time', 'path']

    # Won't log the time
    parser.except = 'time'

    Rack::Analytics.parser = parser

    use Rack::Analytics::RequestLogger

Be sure to just use one of those, since they are mutually excludent (and only has a preference over except). You can also create custom parsers, too, you just need to feed the parser with lambdas, like that:

require 'rack/analytics'

parser = Rack::Analytics::RequestParser.new

parser << lambda { |env, data| data['port'] = env['SERVER_PORT'] }
parser << lambda { |env, data| data['test'] = env['rack.test'] }

Rack::Analytics.parser = parser

use Rack::Analytics::RequestLogger

The env is a hash with all the parameters of the request, and the data is the fields that are saved on the MongoDB. Just be creative. You can use any kind of object, though, as long that they respond to call with two arguments.

Notes on Patches/Pull Requests

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.

License

Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

Thanks

Those are the people that helped me with this project, both with code and/or with guidance. Put your name here if you create a pull request and think you deserves it!

Rafael França [email protected]