Convert to Puma from unicorn

It's a copy / paste from a newly generated project with react_on_rails

Author: thiagoc7

Gemfile

@@ -12,6 +12,7 @@ group :production do
   # Pg is used for Heroku
   gem "pg"
   gem "rails_12factor" # Never include this for development or tests
+  gem "puma"
 end
 
 # Use SCSS for stylesheets
@@ -37,9 +38,6 @@ gem "sdoc", group: :doc
 # Use Rails Html Sanitizer for HTML sanitization
 gem "rails-html-sanitizer"
 
-# Use Unicorn as the app server
-gem "unicorn"
-
 gem "react_on_rails"
 
 # See https://github.com/sstephenson/execjs#readme for more supported runtimes

Gemfile.lock

@@ -130,7 +130,6 @@ GEM
       activesupport (>= 3.0.0, < 5)
       multi_json (~> 1.2)
     json (1.8.3)
-    kgio (2.10.0)
     launchy (2.4.3)
       addressable (~> 2.3)
     libv8 (3.16.14.13)
@@ -168,6 +167,7 @@ GEM
     pry-stack_explorer (0.4.9.2)
       binding_of_caller (>= 0.7)
       pry (>= 0.9.11)
+    puma (2.15.3)
     rack (1.6.4)
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -201,7 +201,6 @@ GEM
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
     rainbow (2.0.0)
-    raindrops (0.15.0)
     rake (10.4.2)
     rdoc (4.2.0)
     react_on_rails (1.1.0)
@@ -307,10 +306,6 @@ GEM
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.7.1)
-    unicorn (5.0.1)
-      kgio (~> 2.6)
-      rack
-      raindrops (~> 0.7)
     web-console (2.2.1)
       activemodel (>= 4.0)
       binding_of_caller (>= 0.7.2)
@@ -347,6 +342,7 @@ DEPENDENCIES
   pry-rails
   pry-rescue
   pry-stack_explorer
+  puma
   rails (~> 4.2)
   rails-html-sanitizer
   rails_12factor
@@ -364,7 +360,6 @@ DEPENDENCIES
   therubyracer
   turbolinks
   uglifier
-  unicorn
   web-console
 
 BUNDLED WITH

Procfile

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

config/puma.rb

@@ -0,0 +1,15 @@
+workers Integer(ENV["WEB_CONCURRENCY"] || 2)
+threads_count = Integer(ENV["MAX_THREADS"] || 5)
+threads threads_count, threads_count
+
+preload_app!
+
+rackup DefaultRackup
+port ENV["PORT"] || 3000
+environment ENV["RACK_ENV"] || "development"
+
+on_worker_boot do
+  # Worker specific setup for Rails 4.1+
+  # See: https://devcenter.heroku.com/articles/deploying-rails-applications-with-the-puma-web-server#on-worker-boot
+  ActiveRecord::Base.establish_connection
+end