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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 defined?(Rails) && Rails.env.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
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