log_inspector is a mountable Rails engine with routes/views for displaying the contents of your Rails log directory (or any other directory).

A live demo can be found at:

http://log-inspector.seanhuber.com

Unix based operating system (Apple OSX or Linux).

The unix commands wc and tail are used to get log file contents and line counts.

Rails >= 4.2

This engine was developed with Rails 4.2 and has been tested to work with Rails 5.0.x and 5.1.x.

jQuery and jQuery-ui.

These are required by the folder-tree jQuery widget (which is used to display the contents of the log folder). For more information on folder-tree, see: https://github.com/seanhuber/folder-tree

Add to your Gemfile:

gem 'log_inspector', '~> 1.1.2'

Then, bundle install.

For basic usage, mount the engine in config/routes.rb, e.g.,

Rails.application.routes.draw do
  mount LogInspector::Engine => '/log_inspector'
  # ... your other application routes
end

Restart your rails server and navigate to http://localhost:3000/log_inspector

Click on subfolders to expend them and click on text-based files to view their contents in the preview pane.

If your log directory is located somewhere that is not <app root>/log, you can set the path in an initializer:

LogInspector.log_path = '/path/to/log/directory'

If you want to embed log_inspector inside of a custom view, you'll first need to add to log_inspector's assets to the pipeline. In app/assets/stylesheets/application.css, add:

/*
 *= require log_inspector/folder-tree
 *= require log_inspector/log-inspector
 */

In app/assets/javascripts/application.js, add:

//= require log_inspector/folder-tree
//= require log_inspector/log_inspector

Then in an erb view file, render log_inspector's primary partial:

<%= render partial: 'log_inspector/panes' %>

Generally you would not want to expose the contents of your log files in the production environment, but log_inspector does not have any restrictions built in. To add constraints it's advised that you add them yourself, see: http://guides.rubyonrails.org/routing.html#advanced-constraints

To simply disable all routes in the production environment you could modify your config/routes.rb to something like:

Rails.application.routes.draw do
  mount LogInspector::Engine => '/log_inspector' unless Rails.env.production?
  # ... your other application routes
end

Or if you do want the engine enabled in production and wish to limit access to specific users, try a strategy like this:

Rails.application.routes.draw do
  mount LogInspector::Engine => '/log_inspector', constraints: CustomConstraint.new
  # ... your other application routes
end

And define your CustomConstraint class in lib/custom_constraint.rb:

class CustomConstraint
  # this class assumes you've set a session variable 'user_roles' which is an array of strings
  def matches?(request)
    request.session['user_roles'].is_a?(Array) && request.session['user_roles'].include?('admin')
  end
end

MIT-LICENSE.