bigcommerce/gruf

# frozen_string_literal: true

# Copyright (c) 2017-present, BigCommerce Pty. Ltd. All rights reserved
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
# documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit
# persons to whom the Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all copies or substantial portions of the
# Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
module Gruf
  module Interceptors
    ##
    # Runs interceptors in a given request context
    #
    class Context
      include Gruf::Loggable

      ##
      # Initialize the interception context
      #
      # @param [Array<Gruf::Interceptors::ServerInterceptor>] interceptors
      #
      def initialize(interceptors = nil)
        @interceptors = interceptors || []
      end

      ##
      # Intercept the given request and run interceptors in a FIFO execution order
      #
      def intercept!(&block)
        return yield if @interceptors.none?

        i = @interceptors.shift
        return yield unless i

        logger.debug "Intercepting request with interceptor: #{i.class}"

        i.call do
          if @interceptors.any?
            intercept!(&block)
          else
            yield
          end
        end
      end
    end
  end
end