Yoshyn

module DebugControllerCallbackChain
  def self.included(base)
    class << base
      prepend ClassMethods
    end
  end

  module ClassMethods
    def inherited(base)
      super

Yoshyn

# Contains :
# * attachment-rc.yml : How to attach a console to a process inside a pod
# * script.sh : Set of script for managing pods easily
# * minikube_on-mac.sh : Install minikube on macos

# Strace & Docker
# https://medium.com/@rothgar/how-to-debug-a-running-docker-container-from-a-separate-container-983f11740dc6

Yoshyn

Let's build our own code reloader for Rails, shall we?

Require dependency problems

Run this inside rails/railties:

$ grep -rn "eager_load_paths" .

You should get the results from Rails::Engine::Configuration and Rails::Engine. As you know, each Rails application is actually a Rails::Engine and Rails::Engine::Configuration is that thing wrapped inside Rails.application.config block.

Yoshyn

# Contains :
# * ruby_glob_analysis.d

Amazing quicksheet              : http://www.tablespace.net/quicksheet/dtrace-quickstart.html
Amasome one-liner               : https://wiki.freebsd.org/DTrace/One-Liners
Adding Probe dynamicly for ruby : https://github.com/kevinykchan/ruby-usdt
IP tracking                     : https://docs.oracle.com/cd/E36784_01/html/E36846/glhhr.html

# Main exemple :
ruby*:::method-entry

Yoshyn

# Contains :
#   * replace_task.rb
#   * convert_date.rb
#   * detect_leaks.rb
#   * trace_point_logger.rb : Display all function path, parameter and return to a file (a logger) POC
#   * profile_gem_on_boot.rb : Loading time per gem
#   * crow_flies_sqlite.rb : An implementation of crow flies for sqlite & rails
#   * openssl.rb : Asyn & sync encryption with openssl

# Convert from ipaddr to netaddr:cidr type

Yoshyn

# Contains :
#   * deploy_git_sync.rb       : Check if a job is running 
#   * identify_errno_EMFILE.sh : identify a Errno::EMFILE over sidekiq 

Yoshyn

# Contains :
#   * deploy_git_sync.rb      : stop deployment if git is not synchronized remote branch.
#   * deploy_lock_per_user.rb : stop deployment if somebody is already deploying the application.
#   * deploy_smart_asset.rb   : Avoid compiling asset if not needed.
#   * passenger_restart.rb    : Restart passenger after deploy.
#   * sidekiq_restart.rb      : Restart sidekiq after deploy.

# Question? Why this and not use gem ?
#   -> Answer : Why use a gem for this? :) 

Yoshyn

unless Rails.env.production?
  module LogQuerySources

    LOG_QUERY_LINES = ENV.fetch('LOG_QUERY_LINES', 3).to_i

    def debug(*args, &block)
      return unless super

      backtrace = Rails.backtrace_cleaner.clean(caller)

Yoshyn

unless File.exist?('Gemfile')
  File.write('Gemfile', <<-GEMFILE)
    source 'https://rubygems.org'
    gem 'rails', '~> 4.2' #, github: 'rails/rails'
  GEMFILE

  system 'bundle'
end

require 'bundler'

Yoshyn

# Contains :
#   * find_duplicated_index.sql
#   * find_missing_index.sql 
#   * find_unused_index.sql
#   * generate_data.sql : Generate a big dummy set of data
#   * update_PG_varchar_to_string.rb  : Update all field in varchar to string into a database
#   * mass_export_and_delete.sql
#   * remove_update_duplicate.sql
#   * sharding_table_stats.sql : Get avg, percentile & co for a table over sharding