Introduce Rails Metal

  # app/metal/poller.rb
  class Poller < Rails::Rack::Metal
    def call(env)
      if env["PATH_INFO"] =~ /^\/poller/
        [200, {"Content-Type" => "application/json"}, Message.recent.to_json]
      else
        super
      end
    end
  end

* There is a generator to help you get started
    `script/generate metal poller`

* Also, metal bits can be ran standalone with rackup
    `rackup app/metal/poller.rb`

1 files changed, 12 insertions, 0 deletions

diff --git a/railties/lib/rails_generator/generators/components/metal/templates/metal.rb b/railties/lib/rails_generator/generators/components/metal/templates/metal.rb
new file mode 100644
index 0000000000..39487263df
--- /dev/null
+++ b/railties/lib/rails_generator/generators/components/metal/templates/metal.rb
@@ -0,0 +1,12 @@
+# Allow the metal piece to run in isolation
+require(File.dirname(__FILE__) + "/../../config/environment") unless defined?(Rails)
+
+class <%= class_name %> < Rails::Rack::Metal
+  def call(env)
+    if env["PATH_INFO"] =~ /^\/<%= file_name %>/
+      [200, {"Content-Type" => "text/html"}, "Hello, World!"]
+    else
+      super
+    end
+  end
+end