Take a peek into your Rails application.
This was originally built at GitHub to help us get insight into what's going on, this is just an extraction so other Rails applications can have the same.
Add this line to your application's Gemfile:
gem 'peek'
And then execute:
$ bundle
Or install it yourself as:
$ gem install peek
Now that Peek is installed, you'll need to mount the engine within your config/routes.rb
file:
Some::Application.routes.draw do
mount Peek::Railtie => '/peek'
root :to => 'home#show'
endTo pick which views you want to see in your Peek bar, just create a file at
config/initializers/peek.rb that has a list of the views you'd like to include:
Peek.into Peek::Views::Git, :nwo => 'github/janky'
Peek.into Peek::Views::Mysql2
Peek.into Peek::Views::Redis
Peek.into Peek::Views::DalliFeel free to pick and install from the list or create your own. The order they are added to Peek, the order they will appear in your bar.
Next, to render the Peek bar in your application just add the following snippet
just after the opening <body> tag in your application layout.
<%= render 'peek/bar' %>It will look like:
<html>
<head>
<title>Application</title>
</head>
<body>
<%= render 'peek/bar' %>
<%= yield %>
</body>
</html>Peek fetches the data collected throughout your requests by using the unique request id that was assigned to the request by Rails. It will call out to its own controller at Peek::ResultsController which will render the data and be inserted into the bar.
Now that you have the partials in your application, you will need to include the CSS and JS that help make Peek ✨
In app/assets/stylesheets/application.scss:
//= require peekIn app/assets/javascripts/application.coffee:
#= require jquery
#= require jquery_ujs
#= require peekNote: Each additional view my have their own CSS and JS you need to require which should be stated in their usage documentation.
For Peek to work, it keeps track of all requests made in your application so it can report back and display that information in the Peek bar. By default it stores this information in memory, which is not recommended for production environments.
In production environments you may have application servers on multiple hosts, at which Peek will not be able to access the request data if it was saved in memory on another host. Peek provides 2 additional adapters for multi server environments.
You can configure which adapter Peek uses by updating your application config or an individual environment config file. We'll use production as an example.
Note: Peek does not provide the dependencies for each of these adapters. If you use these adapters be sure to include their dependencies in your application.
Peeked::Application.configure do
# ...
# Redis with no options
config.peek.adapter = :redis
# Redis with options
config.peek.adapter = :redis, {
:client => Redis.new,
:expires_in => 60 * 30 # => 30 minutes in seconds
}
# Memcache with no options
config.peek.adapter = :memcache
# Memcache with options
config.peek.adapter = :memcache, {
:client => Dalli::Client.new,
:expires_in => 60 * 30 # => 30 minutes in seconds
}
# ...
endPeek doesn't persist the request data forever. It uses a safe 30 minute cache length that way data will be available if you'd like to aggregate it or use it for other Peek views. You can update this to be 30 seconds if you don't want the data to be available to stick around.
It just works.
It just works.
Peek will only render in development and staging environments. If you'd
like to whitelist a select number of users to view Peek in production you
can override the peek_enabled? guard in ApplicationController:
class ApplicationController < ActionController::Base
def peek_enabled?
current_user.staff?
end
end- peek-active_resource
- peek-dalli
- peek-gc
- peek-git
- peek-mongo
- peek-moped
- peek-mysql2
- peek-performance_bar
- peek-pg
- peek-rblineprof
- peek-redis
- peek-resque
- peek-sidekiq
- peek-faraday
- peek-svn
- Unicorn 🔜
Feel free to submit a Pull Request adding your own Peek item to this list.
Each Peek item is a self contained Rails engine which gives you the power to use all features of Ruby on Rails to dig in deep within your application and report it back to the Peek bar. A Peek item is just a custom class that is responsible for fetching and building the data that should be reported back to the user.
There are still some docs to be written, but if you'd like to checkout a simple example of how to create your own, just checkout peek-git. To just look at an example view, there is Peek::Views::Git.
- Fork it
- Create your feature branch (
git checkout -b my-new-feature) - Commit your changes (
git commit -am 'Add some feature') - Push to the branch (
git push origin my-new-feature) - Create new Pull Request