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-rw-r--r--actionpack/lib/action_dispatch/middleware/failsafe.rb52
1 files changed, 52 insertions, 0 deletions
diff --git a/actionpack/lib/action_dispatch/middleware/failsafe.rb b/actionpack/lib/action_dispatch/middleware/failsafe.rb
new file mode 100644
index 0000000000..7379a696aa
--- /dev/null
+++ b/actionpack/lib/action_dispatch/middleware/failsafe.rb
@@ -0,0 +1,52 @@
+module ActionDispatch
+ class Failsafe
+ cattr_accessor :error_file_path
+ self.error_file_path = Rails.public_path if defined?(Rails.public_path)
+
+ def initialize(app)
+ @app = app
+ end
+
+ def call(env)
+ @app.call(env)
+ rescue Exception => exception
+ # Reraise exception in test environment
+ if env["rack.test"]
+ raise exception
+ else
+ failsafe_response(exception)
+ end
+ end
+
+ private
+ def failsafe_response(exception)
+ log_failsafe_exception(exception)
+ [500, {'Content-Type' => 'text/html'}, failsafe_response_body]
+ rescue Exception => failsafe_error # Logger or IO errors
+ $stderr.puts "Error during failsafe response: #{failsafe_error}"
+ end
+
+ def failsafe_response_body
+ error_path = "#{self.class.error_file_path}/500.html"
+ if File.exist?(error_path)
+ File.read(error_path)
+ else
+ "<html><body><h1>500 Internal Server Error</h1></body></html>"
+ end
+ end
+
+ def log_failsafe_exception(exception)
+ message = "/!\\ FAILSAFE /!\\ #{Time.now}\n Status: 500 Internal Server Error\n"
+ message << " #{exception}\n #{exception.backtrace.join("\n ")}" if exception
+ failsafe_logger.fatal(message)
+ end
+
+ def failsafe_logger
+ if defined?(Rails) && Rails.logger
+ Rails.logger
+ else
+ Logger.new($stderr)
+ end
+ end
+ end
+end