Use unicorn and adjust heroku configs

Author: afast

Gemfile

@@ -1,5 +1,7 @@
 source 'https://rubygems.org'
 
+ruby '2.0.0'
+
 gem 'rails', '3.2.13'
 
 # Bundle edge Rails instead:
@@ -43,7 +45,7 @@ group :test do
 end
 
 group :production do
-  gem 'thin'
+  gem 'unicorn'
   gem 'pg'
   gem 'wkhtmltopdf-heroku'
 end
@@ -55,7 +57,6 @@ end
 # gem 'jbuilder'
 
 # Use unicorn as the app server
-# gem 'unicorn'
 
 # Deploy with Capistrano
 # gem 'capistrano'

Gemfile.lock

@@ -44,15 +44,13 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.6.2)
-    daemons (1.1.9)
     devise (2.2.3)
       bcrypt-ruby (~> 3.0)
       orm_adapter (~> 0.1)
       railties (~> 3.1)
       warden (~> 1.2.1)
     diff-lcs (1.2.4)
     erubis (2.7.0)
-    eventmachine (1.0.3)
     execjs (1.4.0)
       multi_json (~> 1.0)
     factory_girl (4.2.0)
@@ -74,6 +72,7 @@ GEM
       railties (>= 3.0, < 5.0)
       thor (>= 0.14, < 2.0)
     json (1.7.7)
+    kgio (2.9.2)
     libv8 (3.11.8.17)
     mail (2.5.3)
       i18n (>= 0.4.0)
@@ -108,6 +107,7 @@ GEM
       rake (>= 0.8.7)
       rdoc (~> 3.4)
       thor (>= 0.14.6, < 2.0)
+    raindrops (0.13.0)
     rake (10.0.4)
     rdoc (3.12.2)
       json (~> 1.4)
@@ -137,10 +137,6 @@ GEM
     therubyracer (0.11.4)
       libv8 (~> 3.11.8.12)
       ref
-    thin (1.5.1)
-      daemons (>= 1.0.9)
-      eventmachine (>= 0.12.6)
-      rack (>= 1.0.0)
     thor (0.18.1)
     tilt (1.3.7)
     treetop (1.4.12)
@@ -150,6 +146,10 @@ GEM
     uglifier (2.0.1)
       execjs (>= 0.3.0)
       multi_json (~> 1.0, >= 1.0.2)
+    unicorn (4.8.2)
+      kgio (~> 2.6)
+      rack
+      raindrops (~> 0.7)
     validate_url (0.2.0)
       activemodel (>= 3.0.0)
     warden (1.2.1)
@@ -176,8 +176,8 @@ DEPENDENCIES
   sass-rails (~> 3.2.3)
   sqlite3
   therubyracer
-  thin
   uglifier (>= 1.0.3)
+  unicorn
   validate_url
   wicked_pdf
   wkhtmltopdf-heroku

Procfile

@@ -0,0 +1 @@
+web: bundle exec unicorn -p $PORT -c ./config/unicorn.rb

config/unicorn.rb

@@ -0,0 +1,22 @@
+worker_processes Integer(ENV["WEB_CONCURRENCY"] || 3)
+timeout 15
+preload_app true
+
+before_fork do |server, worker|
+  Signal.trap 'TERM' do
+    puts 'Unicorn master intercepting TERM and sending myself QUIT instead'
+    Process.kill 'QUIT', Process.pid
+  end
+
+  defined?(ActiveRecord::Base) and
+    ActiveRecord::Base.connection.disconnect!
+end
+
+after_fork do |server, worker|
+  Signal.trap 'TERM' do
+    puts 'Unicorn worker intercepting TERM and doing nothing. Wait for master to send QUIT'
+  end
+
+  defined?(ActiveRecord::Base) and
+    ActiveRecord::Base.establish_connection
+end