Class: Fluent::JSONTransformFilter

Inherits:
Filter
  • Object
show all
Includes:
Configurable
Defined in:
lib/fluent/plugin/filter_json_transform_ex.rb

Constant Summary collapse

DEFAULTS = 
[ 'nothing', 'flatten' ]
DEFAULT_CLASS_NAME = 
'JSONTransformer'

Instance Method Summary collapse

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/filter_json_transform_ex.rb', line 13

def configure(conf)
  @transform_script = conf['transform_script']

  @params = {}
  $log.info("Searching for 'params'...")
  conf.elements.each do |element|
    if element.name == 'params'
      element.to_hash.each do |key, value|
        @params[key] = value
      end
      $log.info("'params' section found: #{@params}") if @params.length > 0
    end
  end
  $log.info("'params' is not found or passed nothing") if @params.empty?

  if DEFAULTS.include?(@transform_script)
    @transform_script = "#{__dir__}/../../transform/#{@transform_script}.rb"
    className = DEFAULT_CLASS_NAME
  elsif @transform_script == 'custom'
    @transform_script = conf['script_path']
    className = conf['class_name'] || DEFAULT_CLASS_NAME
  end

  require @transform_script
  begin
    @transformer = Object.const_get(className).new
    $log.debug("#{className} class is loaded.")
  rescue NameError
    @transformer = Object.const_get(DEFAULT_CLASS_NAME).new
    $log.debug("#{DEFAULT_CLASS_NAME} class is loaded.")
  end
end

#filter(tag, time, record) ⇒ Object 



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# File 'lib/fluent/plugin/filter_json_transform_ex.rb', line 46

def filter(tag, time, record)
  return @transformer.transform(record, @params)
end