Class: Matcher

Inherits:
Object
  • Object
show all
Defined in:
lib/deimos/ext/routing_defaults.rb

Overview

This monkey patch was provided by Maciej, the maintainer of Karafka. This allows configs to override each other on a more granular basis rather than each ‘configure` call blowing away all fields. It also supports multiple default blocks.

Unfortunately this can’t be merged into Karafka as of now because it will be a major breaking change. As a compromise, it has been added to the test coverage of Karafka to ensure that other changes don’t break this. github.com/karafka/karafka/issues/2344

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Matcher

Returns a new instance of Matcher.



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# File 'lib/deimos/ext/routing_defaults.rb', line 10

def initialize
  @applications = []
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(m, *args, **kwargs) ⇒ Object 



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# File 'lib/deimos/ext/routing_defaults.rb', line 48

def method_missing(m, *args, **kwargs)
  if args.empty?
    @applications << [m, kwargs]
  else
    @applications << [m, args]
  end
end

Instance Method Details

#replay_on(topic_node) ⇒ Object 



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# File 'lib/deimos/ext/routing_defaults.rb', line 14

def replay_on(topic_node)
  @applications.each do |method, kwargs|
    if method == :kafka
      topic_node.kafka = kwargs.is_a?(Array) ? kwargs[0] : kwargs
      next
    end
    if kwargs.is_a?(Hash)
      ref = topic_node.public_send(method)

      kwargs.each do |arg, val|
        if ref.respond_to?("#{arg}=")
          ref.public_send("#{arg}=", val)
        else
          if ref.respond_to?(:details)
            ref.details.merge!(kwargs)
          elsif ref.is_a?(Hash)
            ref.merge!(kwargs)
          else
            raise 'No idea if such case exists, if so, similar handling as config'
          end
        end
      end
    end

    if kwargs.is_a?(Array) && kwargs.size == 1
      if topic_node.respond_to?("#{method}=")
        topic_node.public_send(:"#{method}=", kwargs.first)
      else
        topic_node.public_send(method, *kwargs)
      end
    end
  end
end