Contents

module NdrError
  module Middleware
    # Middleware for logging exceptions, can be used as exception_app for Rails.
    class PublicExceptions < ::ActionDispatch::PublicExceptions
      def call(env)
        rescuing_everything do
          request   = ActionDispatch::Request.new(env)
          exception = env['action_dispatch.exception']

          # "falsey" callback return value allows logging to be skipped
          log_exception(request, exception) if run_exception_callback(request, exception)
        end

        super # Invoke the PublicExceptions behaviour
      end

      private

      def log_exception(request, exception)
        parameters = NdrError.log_parameters.call(request)
        _fingerprint, _log = NdrError.log(exception, parameters, request)
      end

      def run_exception_callback(request, exception)
        NdrError.exception_app_callback.call(request, exception)
      end

      # Unhandled exceptions with logging could terminate the web server!
      def rescuing_everything
        yield
      rescue Exception => exception # rubocop:disable Lint/RescueException
        # "Log the exception caused by logging an exception..."
        Rails.logger.warn <<-MSG.strip_heredoc
          NdrError failed to log an exception!
            logging error class:   #{exception.class}
            logging error message: #{exception.message}
        MSG
      end
    end
  end
end

Version data entries

8 entries across 8 versions & 1 rubygems

Version	Path
ndr_error-2.1.0	lib/ndr_error/middleware/public_exceptions.rb
ndr_error-2.0.3	lib/ndr_error/middleware/public_exceptions.rb
ndr_error-2.0.2	lib/ndr_error/middleware/public_exceptions.rb
ndr_error-2.0.1	lib/ndr_error/middleware/public_exceptions.rb
ndr_error-2.0.0	lib/ndr_error/middleware/public_exceptions.rb
ndr_error-1.1.1	lib/ndr_error/middleware/public_exceptions.rb
ndr_error-1.0.1	lib/ndr_error/middleware/public_exceptions.rb
ndr_error-1.0.0	lib/ndr_error/middleware/public_exceptions.rb