Merge pull request #40 from corpix/unicorn

Unicorn

Gemfile

@@ -21,6 +21,7 @@ gem 'devise'
 # Web server
 gem 'thin'
+gem "unicorn", "~> 4.4.0"
 # Haml
 gem 'haml-rails'

Gemfile.lock

@@ -95,6 +95,7 @@ GEM
       railties (>= 3.1.0, < 5.0)
       thor (~> 0.14)
     json (1.7.5)
+    kgio (2.7.4)
     libv8 (3.3.10.4)
     libwebsocket (0.1.5)
       addressable
@@ -141,6 +142,7 @@ GEM
       rake (>= 0.8.7)
       rdoc (~> 3.4)
       thor (>= 0.14.6, < 2.0)
+    raindrops (0.10.0)
     rake (0.9.2.2)
     rb-fsevent (0.9.1)
     rb-inotify (0.8.8)
@@ -214,6 +216,10 @@ GEM
     uglifier (1.3.0)
       execjs (>= 0.3.0)
       multi_json (~> 1.0, >= 1.0.2)
+    unicorn (4.4.0)
+      kgio (~> 2.6)
+      rack
+      raindrops (~> 0.7)
     vegas (0.1.11)
       rack (>= 1.0.0)
     warden (1.2.1)
@@ -259,4 +265,5 @@ DEPENDENCIES
   therubyracer
   thin
   uglifier (>= 1.0.3)
+  unicorn (~> 4.4.0)
   will_paginate (~> 3.0)

config/unicorn.rb

+app_dir = "/home/gitlab-ci/gitlab-ci/"
+worker_processes 2
+working_directory app_dir
+
+# Load app into the master before forking workers for super-fast
+# worker spawn times
+preload_app true
+
+# nuke workers after 30 seconds (60 is the default)
+timeout 30
+
+# listen on a Unix domain socket and/or a TCP port,
+
+#listen 8080 # listen to port 8080 on all TCP interfaces
+#listen "127.0.0.1:8080"  # listen to port 8080 on the loopback interface
+listen "#{app_dir}/tmp/sockets/gitlab-ci.socket"
+
+pid "#{app_dir}/tmp/pids/unicorn.pid"
+stderr_path "#{app_dir}/log/unicorn.stderr.log"
+stdout_path "#{app_dir}/log/unicorn.stdout.log"
+
+# http://www.rubyenterpriseedition.com/faq.html#adapt_apps_for_cow
+if GC.respond_to?(:copy_on_write_friendly=)
+  GC.copy_on_write_friendly = true
+end
+
+
+before_fork do |server, worker|
+  # the following is highly recomended for Rails + "preload_app true"
+  # as there's no need for the master process to hold a connection
+  defined?(ActiveRecord::Base) and ActiveRecord::Base.connection.disconnect!
+
+  ##
+  # When sent a USR2, Unicorn will suffix its pidfile with .oldbin and
+  # immediately start loading up a new version of itself (loaded with a new
+  # version of our app). When this new Unicorn is completely loaded
+  # it will begin spawning workers. The first worker spawned will check to
+  # see if an .oldbin pidfile exists. If so, this means we've just booted up
+  # a new Unicorn and need to tell the old one that it can now die. To do so
+  # we send it a QUIT.
+  #
+  # Using this method we get 0 downtime deploys.
+
+  old_pid = "#{server.config[:pid]}.oldbin"
+
+  if File.exists?(old_pid) && server.pid != old_pid
+    begin
+      sig = (worker.nr + 1) >= server.worker_processes ? :QUIT : :TTOU
+      Process.kill(sig, File.read(old_pid).to_i)
+    rescue Errno::ENOENT, Errno::ESRCH
+      # someone else did our job for us
+    end
+  end
+end
+
+after_fork do |server, worker|
+  # Unicorn master loads the app then forks off workers - because of the way
+  # Unix forking works, we need to make sure we aren't using any of the parent's
+  # sockets, e.g. db connection
+
+  defined?(ActiveRecord::Base) and ActiveRecord::Base.establish_connection
+  # Redis and Memcached would go here but their connections are established
+  # on demand, so the master never opens a socket
+end