Aioli Logging Formatter

Aioli logger (All In One LIne Logger) is a logging formatter for Rails 3.

Aioli make our meals delicious, right?

By default it logs lines of format:

<date> <host> rails[<processId>] <sessionId> u<userId>: <message>

Examples:

Nov 23 14:27:56 host rails[19572] f79a2d8633 u18: Completed in 1218ms (View: 772, DB: 209) | 200 OK [http://localhost/claims]
Nov 23 14:27:56 host rails[19572] 0 u0: Completed in 1218ms (View: 772, DB: 209) | 200 OK [http://localhost/claims]

Installation

Add this line to your application's Gemfile:

gem 'aioli_log_formatter'

And then execute:

$ bundle

Or install it yourself as:

$ gem install aioli_log_formatter

Usage

Enable the formatter:

# config/application.rb
...
  class Application < Rails::Application
    ...
    config.aioli_log_formatter.enabled = true

Enable before filters to retrieve session ID and user ID from default sources.

class ApplicationController < ActionController::Base

  aioli_log_formatter
  ...
end

This is the same as:

class ApplicationController < ActionController::Base

  aioli_log_formatter user_id: lambda { |controller| controller.session[:user_id] },
                   session_id: lambda { |controller| controller.request.session_options[:id] }
  ...
end

To get the values from different sources simply change the procs, e.g.:

class ApplicationController < ActionController::Base

  aioli_log_formatter user_id: lambda { |controller| controller.session[:account_id] }
  ...
end

When using Devise gem you can get the user ID as follows:

class ApplicationController < ActionController::Base

  aioli_log_formatter user_id: lambda { |controller|
    user = controller.env['warden'].user
    user ? user.id : nil
  }
  ...
end

Define your own Formatter

Define your formatter by inheriting from AioliLogFormatter::Formatter for example:

class MyAwesomeFormatter < AioliLogFormatter::Formatter

  # I like different formatting
  def call(severity, timestamp, progname, message)
    "#{timestamp} #{hostname} pid=#{process_id} sid=#{shorten_session_id} uid=#{user_id} msg=#{sanitize(message)}\n"
  end

end

Have a look into source code of AioliLogFormatter::Formatter for more methods to overwrite.

Enable the formatter:

# config/application.rb
require_relative "../path/to/my_awesome_formatter"

...
  class Application < Rails::Application
    ...
    config.aioli_log_formatter.enabled = true
    config.aioli_log_formatter.formatter = MyAwesomeFormatter.new

See new formatting:

2013-11-12 16:16:50 +0100 host pid=69402 sid=e36db0f022 uid=u42 msg=Started GET "/...

Tests

Examples are located under spec and test/dummy/spec and are executed via:

$ cd path/to/aioli_log_formatter
$ bundle exec rake spec

Credits

Inspired by logjam_logger

aioli_log_formatter