Class: LogStash::Config::AST::PluginSection

Inherits:
Node
  • Object
show all
Defined in:
lib/logstash/config/config_ast.rb

Constant Summary collapse

@@i =

Global plugin numbering for the janky instance variable naming we use like @filter_<name>_1

0

Instance Method Summary collapse

Methods inherited from Node

#text_value_for_comments

Instance Method Details

#compile_initializer ⇒ Object

Generate ruby code to initialize all the plugins.



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# File 'lib/logstash/config/config_ast.rb', line 138

def compile_initializer
  generate_variables
  code = []
  @variables.each do |plugin, name|


    code << <<-CODE
      #{name} = #{plugin.compile_initializer}
      @#{plugin.plugin_type}s << #{name}
    CODE

    # The flush method for this filter.
    if plugin.plugin_type == "filter"

      code << <<-CODE
        #{name}_flush = lambda do |options, &block|
          @logger.debug? && @logger.debug(\"Flushing\", :plugin => #{name})

          events = #{name}.flush(options)

          return if events.nil? || events.empty?

          @logger.debug? && @logger.debug(\"Flushing\", :plugin => #{name}, :events => events)

          #{plugin.compile_starting_here.gsub(/^/, "  ")}

          events.each{|e| block.call(e)}
        end

        if #{name}.respond_to?(:flush)
          @periodic_flushers << #{name}_flush if #{name}.periodic_flush
          @shutdown_flushers << #{name}_flush
        end
      CODE

    end
  end
  return code.join("\n")
end

#generate_variables ⇒ Object 



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# File 'lib/logstash/config/config_ast.rb', line 183

def generate_variables
  return if !@variables.nil?
  @variables = {}
  plugins = recursive_select(Plugin)

  plugins.each do |plugin|
    # Unique number for every plugin.
    @@i += 1
    # store things as ivars, like @filter_grok_3
    var = "@#{plugin.plugin_type}_#{plugin.plugin_name}_#{@@i}"
    @variables[plugin] = var
  end
  return @variables
end

#variable(object) ⇒ Object 



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# File 'lib/logstash/config/config_ast.rb', line 178

def variable(object)
  generate_variables
  return @variables[object]
end