unicorn as server

Author: espen

Gemfile

@@ -2,7 +2,7 @@ source 'https://rubygems.org'
 ruby '2.0.0'
 
 group :heroku do
-  gem 'thin'
+  gem 'unicorn'
   gem 'rails_12factor'
 end
 

Gemfile.lock

@@ -36,9 +36,7 @@ GEM
     carrierwave (0.6.1)
       activemodel (>= 3.2.0)
       activesupport (>= 3.2.0)
-    daemons (1.1.9)
     erubis (2.7.0)
-    eventmachine (1.0.0)
     excon (0.13.4)
     faraday (0.8.8)
       multipart-post (~> 1.2.0)
@@ -61,6 +59,7 @@ GEM
     json (1.8.0)
     jwt (0.1.8)
       multi_json (>= 1.5)
+    kgio (2.8.1)
     mail (2.5.4)
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
@@ -119,6 +118,7 @@ GEM
       rake (>= 0.8.7)
       rdoc (~> 3.4)
       thor (>= 0.14.6, < 2.0)
+    raindrops (0.12.0)
     rake (10.1.0)
     rdoc (3.12.2)
       json (~> 1.4)
@@ -132,16 +132,16 @@ GEM
     sqlite3-ruby (1.3.3)
       sqlite3 (>= 1.3.3)
     subexec (0.2.2)
-    thin (1.5.0)
-      daemons (>= 1.0.9)
-      eventmachine (>= 0.12.6)
-      rack (>= 1.0.0)
     thor (0.18.1)
     tilt (1.4.1)
     treetop (1.4.15)
       polyglot
       polyglot (>= 0.3.1)
     tzinfo (0.3.37)
+    unicorn (4.6.3)
+      kgio (~> 2.6)
+      rack
+      raindrops (~> 0.7)
 
 PLATFORMS
   ruby
@@ -159,4 +159,4 @@ DEPENDENCIES
   rails (= 3.2.14)
   rails_12factor
   sqlite3-ruby
-  thin
+  unicorn

Procfile

@@ -1 +1 @@
-web: bundle exec thin start -p $PORT -e $RACK_ENV
+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