Fixing FanOutOnWriteService, fixing Sidekiq not having enough DB connections

in the pool, adding a throttle of 60rpm per IP, adding mini profiler, adding
admin status to users

Gemfile

@@ -58,10 +58,13 @@ group :development do
   gem 'rubocop', require: false
   gem 'better_errors'
   gem 'binding_of_caller'
-  gem 'rack-mini-profiler'
   gem 'letter_opener'
 end
 
 group :production do
   gem 'rails_12factor'
 end
+
+group :development, :production do
+  gem 'rack-mini-profiler'
+end

app/controllers/application_controller.rb

@@ -2,4 +2,11 @@ class ApplicationController < ActionController::Base
   # Prevent CSRF attacks by raising an exception.
   # For APIs, you may want to use :null_session instead.
   protect_from_forgery with: :exception
+
+  # Profiling
+  before_action do
+    if current_user && current_user.admin?
+      Rack::MiniProfiler.authorize_request
+    end
+  end
 end

app/lib/feed_manager.rb

@@ -6,6 +6,7 @@ class FeedManager
   end
 
   def self.filter_status?(status, follower)
+    replied_to_user = status.reply? ? status.thread.account : nil
     (status.reply? && !(follower.id = replied_to_user.id || follower.following?(replied_to_user)))
   end
 end

app/models/user.rb

@@ -7,4 +7,8 @@ class User < ActiveRecord::Base
   validates :account, presence: true
 
   has_many :oauth_applications, class_name: 'Doorkeeper::Application', as: :owner
+
+  def admin?
+    self.admin
+  end
 end

app/services/fan_out_on_write_service.rb

@@ -3,7 +3,7 @@ class FanOutOnWriteService < BaseService
   # @param [Status] status
   def call(status)
     deliver_to_self(status) if status.account.local?
-    deliver_to_followers(status, status.reply? ? status.thread.account : nil)
+    deliver_to_followers(status)
     deliver_to_mentioned(status)
   end
 
@@ -13,7 +13,7 @@ class FanOutOnWriteService < BaseService
     push(:home, status.account.id, status)
   end
 
-  def deliver_to_followers(status, replied_to_user)
+  def deliver_to_followers(status)
     status.account.followers.each do |follower|
       next if !follower.local? || FeedManager.filter_status?(status, follower)
       push(:home, follower.id, status)

config/database.yml

@@ -1,6 +1,6 @@
 default: &default
   adapter: postgresql
-  pool: 5
+  pool: 25
   timeout: 5000
   encoding: unicode
 

config/initializers/rack-attack.rb

@@ -1,3 +1,5 @@
 class Rack::Attack
-  # TODO
+  throttle('req/ip', limit: 300, period: 5.minutes) do |req|
+    req.ip
+  end
 end

config/routes.rb

@@ -1,7 +1,7 @@
 require 'sidekiq/web'
 
 Rails.application.routes.draw do
-  authenticate :user do
+  authenticate :user, lambda { |u| u.admin? } do
     mount Sidekiq::Web => '/sidekiq'
   end
 

db/migrate/20160325130944_add_admin_to_users.rb

@@ -0,0 +1,5 @@
+class AddAdminToUsers < ActiveRecord::Migration
+  def change
+    add_column :users, :admin, :boolean, default: false
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20160322193748) do
+ActiveRecord::Schema.define(version: 20160325130944) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -156,6 +156,7 @@ ActiveRecord::Schema.define(version: 20160322193748) do
     t.datetime "last_sign_in_at"
     t.inet     "current_sign_in_ip"
     t.inet     "last_sign_in_ip"
+    t.boolean  "admin",                  default: false
   end
 
   add_index "users", ["account_id"], name: "index_users_on_account_id", using: :btree