Return valid Rack responses from status server

Use Rack::Lint to check the response is valid. Existing code really just
needed Content-Length & Content-Type headers.

History.txt

@@ -1,3 +1,14 @@
+=== HEAD
+
+1 minor feature:
+
+  Return valid Rack responses (passes Lint) from status
+  server.
+
+1 new contributer:
+
+  * Jesse Cooke
+
 === 1.2.2 / 2012-04-28
 
 * 4 bug fixes:

lib/puma/app/status.rb

@@ -6,6 +6,7 @@ module Puma
         @cli = cli
         @auth_token = nil
       end
+      OK_STATUS = '{ "status": "ok" }'.freeze
 
       attr_accessor :auth_token
 
@@ -16,34 +17,39 @@ module Puma
 
       def call(env)
         unless authenticate(env)
-          return [403, {}, ["Invalid auth token"]]
+          return rack_response(403, "Invalid auth token")
         end
 
         case env['PATH_INFO']
         when "/stop"
           @server.stop
-          return [200, {}, ['{ "status": "ok" }']]
+          return rack_response(200, OK_STATUS)
 
         when "/halt"
           @server.halt
-          return [200, {}, ['{ "status": "ok" }']]
+          return rack_response(200, OK_STATUS)
 
         when "/restart"
           if @cli and @cli.restart_on_stop!
             @server.begin_restart
 
-            return [200, {}, ['{ "status": "ok" }']]
+            return rack_response(200, OK_STATUS)
           else
-            return [200, {}, ['{ "status": "not configured" }']]
+            return rack_response(200, '{ "status": "not configured" }')
           end
 
         when "/stats"
           b = @server.backlog
           r = @server.running
-          return [200, {}, ["{ \"backlog\": #{b}, \"running\": #{r} }"]]
+            return rack_response(200, %Q!{ "backlog": #{b}, "running": #{r} }!)
         end
 
-        [404, {}, ["Unsupported action"]]
+        rack_response 404, "Unsupported action"
+      end
+
+      private
+      def rack_response(status, body)
+        [status, { 'Content-Type' => 'text/plain', 'Content-Length' => body.length.to_s }, [body]]
       end
     end
   end

test/test_app_status.rb

@@ -1,4 +1,5 @@
 require 'test/unit'
+require 'rack'
 require 'puma/app/status'
 
 class TestAppStatus < Test::Unit::TestCase
@@ -27,6 +28,12 @@ class TestAppStatus < Test::Unit::TestCase
     @app.auth_token = nil
   end
 
+  def lint(env)
+    app = Rack::Lint.new @app
+    mock_env = Rack::MockRequest.env_for env['PATH_INFO']
+    app.call mock_env
+  end
+
   def test_bad_token
     @app.auth_token = "abcdef"
 
@@ -35,6 +42,7 @@ class TestAppStatus < Test::Unit::TestCase
     status, _, _ = @app.call env
 
     assert_equal 403, status
+    lint(env)
   end
 
   def test_good_token
@@ -48,6 +56,7 @@ class TestAppStatus < Test::Unit::TestCase
     status, _, _ = @app.call env
 
     assert_equal 404, status
+    lint(env)
   end
 
   def test_unsupported
@@ -56,6 +65,7 @@ class TestAppStatus < Test::Unit::TestCase
     status, _, _ = @app.call env
 
     assert_equal 404, status
+    lint(env)
   end
 
   def test_stop
@@ -66,6 +76,7 @@ class TestAppStatus < Test::Unit::TestCase
     assert_equal :stop, @server.status
     assert_equal 200, status
     assert_equal ['{ "status": "ok" }'], body
+    lint(env)
   end
 
   def test_halt
@@ -76,6 +87,7 @@ class TestAppStatus < Test::Unit::TestCase
     assert_equal :halt, @server.status
     assert_equal 200, status
     assert_equal ['{ "status": "ok" }'], body
+    lint(env)
   end
 
   def test_stats
@@ -88,6 +100,7 @@ class TestAppStatus < Test::Unit::TestCase
 
     assert_equal 200, status
     assert_equal ['{ "backlog": 1, "running": 9 }'], body
+    lint(env)
   end
 
 end