change prod server from thin to unicorn

Gemfile

@@ -31,6 +31,7 @@ gem 'json_builder'
 gem "statsd-ruby", :require => "statsd"
 # gem 'trashed', :git => 'https://github.com/ninetwentyfour/trashed.git'
 gem 'impressionist'
+gem 'unicorn'
 
 # heroku gems for pulling/pushing db
 # gem 'heroku'
@@ -56,7 +57,7 @@ group :production do
 	gem 'airbrake'
 	gem 'home_run', :require=>'date'
 	#gem 'slim_scrooge', :git => "git://github.com/sdsykes/slim_scrooge.git"
-	gem 'thin'
+  # gem 'thin'
 	gem 'pg'
 	gem 'newrelic_rpm'
 	gem 'heroku'

Gemfile.lock

@@ -119,7 +119,6 @@ GEM
       capybara (>= 1.1.2)
       cucumber (>= 1.1.8)
       nokogiri (>= 1.5.0)
-    daemons (1.1.9)
     dalli (2.6.0)
     database_cleaner (0.9.1)
     devise (2.2.3)
@@ -201,6 +200,7 @@ GEM
       redis
     jwt (0.1.5)
       multi_json (>= 1.0)
+    kgio (2.8.0)
     launchy (2.1.2)
       addressable (~> 2.3)
     less (2.2.2)
@@ -295,6 +295,7 @@ GEM
       rake (>= 0.8.7)
       rdoc (~> 3.4)
       thor (>= 0.14.6, < 2.0)
+    raindrops (0.10.0)
     rake (10.0.3)
     rdoc (3.12.1)
       json (~> 1.4)
@@ -352,10 +353,6 @@ GEM
     therubyracer (0.11.3)
       libv8 (~> 3.11.8.12)
       ref
-    thin (1.5.0)
-      daemons (>= 1.0.9)
-      eventmachine (>= 0.12.6)
-      rack (>= 1.0.0)
     thor (0.17.0)
     tilt (1.3.3)
     treetop (1.4.12)
@@ -372,6 +369,10 @@ GEM
     unf (0.0.5)
       unf_ext
     unf_ext (0.0.5)
+    unicorn (4.6.1)
+      kgio (~> 2.6)
+      rack
+      raindrops (~> 0.7)
     uuidtools (2.1.3)
     warden (1.2.1)
       rack (>= 1.0)
@@ -437,9 +438,9 @@ DEPENDENCIES
   spreadsheet
   statsd-ruby
   therubyracer
-  thin
   to_xls!
   twitter
   uglifier
+  unicorn
   uuidtools
   will_paginate

Procfile

@@ -1 +1 @@
-web: bundle exec thin start -p $PORT -e $RACK_ENV
+web: bundle exec unicorn -p $PORT -c ./config/unicorn.rb

config/environments/production.rb

@@ -73,4 +73,8 @@
 
   # Generate digests for assets URLs
   config.assets.digest = true
+
+  # handle logging with unicorn and heroku
+  config.logger = Logger.new(STDOUT)
+  config.logger.level = Logger.const_get(ENV['LOG_LEVEL'] ? ENV['LOG_LEVEL'].upcase : 'INFO')
 end

config/initializers/newrelic_reconnect.rb

@@ -0,0 +1,8 @@
+# config/initailizers/newrelic_reconnect.rb
+
+# Ensure the agent is started using Unicorn
+# This is needed when using Unicorn and preload_app is NOT set to true.
+# https://newrelic.com/docs/ruby/no-data-with-unicorn
+if Rails.env.production?
+  NewRelic::Agent.after_fork(:force_reconnect => true) if defined? Unicorn
+end

config/unicorn.rb

@@ -0,0 +1,9 @@
+# config/unicorn.rb
+
+# Minimal Heroku unicorn config
+# * I found no real gain from enabling preload_app on Heroku (which makes for faster worker starts/restarts), 
+#   and it will cause strange issues if you don't re-establish all connections correctly
+# * Heroku has a 30s timeout so we set to 60, allowing them to handle timeouts and issue an H12 error
+# * Depending on your memory usage workers can be bumped to 3-4. With Sinatra it can be 8+
+worker_processes 3
+timeout 60