pavel-sazonov

ncat -C httpbin.org 80
GET /anything HTTP/1.1
Host: httpbin.org

HTTP/1.1 200 OK
Connection: keep-alive
Server: meinheld/0.6.1
Date: Thu, 09 Nov 2017 05:46:29 GMT
Content-Type: application/json
Access-Control-Allow-Origin: *

pavel-sazonov

String file contents

pavel-sazonov

#application.js

var App = App || {}
App.cable = ActionCable.createConsumer();


#questions.coffee

ready = ->
  questionsList = $('.questions-list')

pavel-sazonov

require 'rails_helper'

RSpec.describe Ability do
  subject(:ability) { Ability.new(user) }

  describe "for guest" do
    let(:user) { nil }

    it { should be_able_to :read, :all }
    it { should_not be_able_to :manage, :all }

pavel-sazonov

class Ability
  include CanCan::Ability

  def initialize(user)
    if user
      can :create, [Question, Answer, Attachment, Comment]

      can %i[update destroy], [Question, Answer], user_id: user.id
      can :destroy, Comment, user_id: user.id
      can :destroy, Attachment, attachable: { user_id: user.id }

pavel-sazonov

### Unicorn ###
check process unicorn
  with pidfile "/home/deployer/qna/current/tmp/pids/unicorn.pid"
  start program = "/bin/su - deployer -c 'cd /home/deployer/qna/current && /home/deployer/.rvm/bin/rvm default do bundle exec unicorn -c /home/deployer/qna/current/config/unicorn/production.rb -E deployment -D'"
  stop program = "/bin/su - deployer -c 'cd /home/deployer/qna/current && /home/deployer/.rvm/bin/rvm default do bundle exeс kill -s USR2 `cat /home/deployer/qna/current/tmp/pids/unicorn.pid`'"
  if memory usage > 90% for 3 cycles then restart
  if cpu > 90% for 2 cycles then restart
  if 5 restarts within 5 cycles then timeout

### Nginx ###

pavel-sazonov

### Nginx ###
check process nginx with pidfile /opt/nginx/logs/nginx.pid
  start program = "/etc/init.d/nginx start"
  stop program = "/etc/init.d/nginx stop"
  if cpu > 60% for 2 cycles then alert
  if cpu > 80% for 5 cycles then restart
  if memory usage > 80% for 5 cycles then restart
  if failed host 127.0.0.1 port 80 protocol http
    then restart
  if 3 restarts within 5 cycles then timeout

pavel-sazonov

# paths
app_path = "/home/deployer/qna"
working_directory "#{app_path}/current"
pid               "#{app_path}/current/tmp/pids/unicorn.pid"

# listen
listen "/tmp/unicorn.qna.sock", :backlog => 64

# logging
stderr_path "log/unicorn.stderr.log"

pavel-sazonov

Алгоритмы:
1) Стивен Скиена "Алгоритмы. Руководство по разработке"
2) Томас Кормен "Алгоритмы. Построение и анализ"
3) Дональд Кнут "Искусство программирования" (никто в реальности не читал этот многотомный труд целиком, но в любой подборке по алгоритмам он обязан быть)

Общее:
1) Род Хаггарти "Дискретная математика для программистов"
2) Керниган, Ритчи "Язык программирования С" - для общего понимания принципов программирования
3) Дж. Андресон "Дискретная математика и комбинаторика"
4) Романовский И.В. "Дискретный анализ"

pavel-sazonov

module Resourceable
  extend ActiveSupport::Concern

  included do
    helper_method :resource, :resources, :resource_class
  end

  def index; end

  def show; end