fix BodyProxy#close

Signed-off-by: Konstantin Haase <konstantin.mailinglists@googlemail.com>

lib/rack/body_proxy.rb

@@ -1,17 +1,25 @@
 module Rack
   class BodyProxy
     def initialize(body, &block)
-      @body, @block = body, block
+      @body, @block, @closed = body, block, false
     end
 
     def respond_to?(*args)
       super or @body.respond_to?(*args)
     end
 
     def close
-      @body.close if @body.respond_to? :close
-    ensure
-      @block.call
+      return if closed?
+      begin
+        @body.close if @body.respond_to? :close
+      ensure
+        @block.call
+        @closed = true
+      end
+    end
+
+    def closed?
+      @closed
     end
 
     def method_missing(*args, &block)

test/spec_body_proxy.rb

@@ -0,0 +1,9 @@
+describe Rack::BodyProxy do
+  should 'not close more than one time' do
+    count = 0
+    proxy = Rack::BodyProxy.new([]) { count += 1 }
+    proxy.close
+    proxy.close
+    count.should == 1
+  end
+end