Contents

##

# Kenny module does two things:
# - Holds reference to the Rails application (set through Railtie)
# - Create LogSubscriber-classes which will be attached to the user-specified instrumentations
module Kenny
  def self.configs
    Struct.new(:instrumentations).new
  end

  def self.application=(app)
    @application = app
  end

  def self.application
    @application
  end

  ##
  # Define LogSubscriber-classes and Attach to user-specified instrumentations
  # if the configurations have been set.
  def self.attach_to_instrumentations
    if @application.config.kenny[:instrumentations]
      @application.config.kenny[:instrumentations].each do |instr_config|
        define_log_subscriber_class(instr_config)
      end
    end
  end

  ##
  # Create LogSubscriber-classes which will be attached to the user-specified instrumentations
  # These classes are anonymous, but inherit from Kenny::LogSubscriber to simplify testing
  #
  # Within these classes, methods (and potentially `def logger`) are defined based on the
  # instrumentations-configs provided by the user.
  def self.define_log_subscriber_class(instr_config)
    klass = Class.new(Kenny::LogSubscriber) do |k|
      define_method(instr_config[:name].split('.')[0], instr_config[:block])

      if instr_config[:logger]
        # Following assignment needed as we don't want to have
        # the lambda being re-evaluated and possibly return
        # a new logger instance everytime the .logger method is invoked.
        defined_logger = instr_config[:logger]
        define_method(:logger, lambda { defined_logger })
      end
    end
    klass.attach_to instr_config[:name].split('.')[1].to_sym
  end
  private_class_method :define_log_subscriber_class
end

require 'kenny/railtie'

require 'kenny/formatters/log_stash_formatter'
require 'kenny/log_subscriber'

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
kenny-0.1.5	lib/kenny.rb
kenny-0.1.4	lib/kenny.rb
kenny-0.1.3	lib/kenny.rb