Class: Fluent::FlattenOutput

Inherits:
Output
  • Object
show all
Includes:
HandleTagNameMixin
Defined in:
lib/fluent/plugin/out_flatten.rb

Defined Under Namespace

Classes: Error

Instance Method Summary collapse

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_flatten.rb', line 26

def configure(conf)
  super

  if (
      !remove_tag_prefix &&
      !remove_tag_suffix &&
      !add_tag_prefix    &&
      !add_tag_suffix
  )
    raise ConfigError, "out_flatten: At least one of remove_tag_prefix/remove_tag_suffix/add_tag_prefix/add_tag_suffix is required to be set"
  end
end

#emit(tag, es, chain) ⇒ Object 



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# File 'lib/fluent/plugin/out_flatten.rb', line 39

def emit(tag, es, chain)
  es.each do |time, record|
    flattened = flatten(record)

    flattened.each do |keypath, value|
      tag_with_keypath = [tag.clone, keypath].join('.')
      filter_record(tag_with_keypath, time, value)

      router.emit(tag_with_keypath, time, value)
    end
  end

  chain.next
end

#flatten(record) ⇒ Object 



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# File 'lib/fluent/plugin/out_flatten.rb', line 54

def flatten(record)
  flattened = {}

  if record.has_key?(key) && !record[key].empty?
    hash = nil

    begin
      if parse_json
        # XXX work-around
        # fluentd seems to escape json value excessively
        json = record[key].gsub(/\\"/, '"')
        hash = JSON.parse(json)
      else
        hash = record[key]
      end
    rescue JSON::ParserError
      return flattened
    end

    processor = lambda do |root, hash|
      flattened = {}
      return flattened unless hash.is_a?(Hash)

      hash.each do |path, value|
        keypath = [root, path].join('.')

        if value.is_a?(Hash)
          flattened = flattened.merge(processor.call(keypath, value))
        else
          flattened[keypath] = { inner_key => value }
        end
      end

      flattened
    end

    flattened  = processor.call(key, hash)
  end

  flattened
end