Class: Plugin::RecordModifierFilter

Inherits:
Filter
  • Object
show all
Defined in:
lib/fluent/plugin/filter_record_modifier.rb

Defined Under Namespace

Classes: DynamicExpander

Instance Method Summary collapse

Instance Method Details

#configure(conf) ⇒ Object


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# File 'lib/fluent/plugin/filter_record_modifier.rb', line 50

def configure(conf)
  super

  if conf.has_key?('include_tag_key')
    raise ConfigError, "include_tag_key and tag_key parameters are removed. Use 'tag ${tag}' in <record> section"
  end

  @map = {}
  @to_enc = nil
  if @char_encoding
    from, to = @char_encoding.split(':', 2)
    @from_enc = Encoding.find(from)
    @to_enc = Encoding.find(to) if to

    m = if @to_enc
          method(:convert_encoding)
        else
          method(:set_encoding)
        end

    (class << self; self; end).module_eval do
      define_method(:change_encoding, m)
    end
  end

  @has_tag_parts = false
  conf.elements.select { |element| element.name == 'record' }.each do |element|
    element.each_pair do |k, v|
      check_config_placeholders(k, v)
      element.has_key?(k) # to suppress unread configuration warning
      @has_tag_parts = true if v.include?('tag_parts')
      @map[k] = DynamicExpander.new(k, v, @prepare_value)
    end
  end

  if @remove_keys and @whitelist_keys
    raise Fluent::ConfigError, "remove_keys and whitelist_keys are exclusive with each other."
  elsif @remove_keys
    @remove_keys = @remove_keys.split(',').map(&:strip)
  elsif @whitelist_keys
    @whitelist_keys = @whitelist_keys.split(',').map(&:strip)
  end

  # Collect DynamicExpander related garbage instructions
  GC.start
end

#filter(tag, time, record) ⇒ Object


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# File 'lib/fluent/plugin/filter_record_modifier.rb', line 97

def filter(tag, time, record)
  tag_parts = @has_tag_parts ? tag.split('.') : nil

  @map.each_pair { |k, v|
    record[k] = v.expand(tag, time, record, tag_parts)
  }

  if @remove_keys
    @remove_keys.each { |v|
      record.delete(v)
    }
  elsif @whitelist_keys
    modified = {}
    record.each do |k, v|
      modified[k] = v if @whitelist_keys.include?(k)
    end
    record = modified
  end

  unless @replaces.empty?
    @replaces.each { |replace|
      target_key = replace.key
      if record.include?(target_key) && replace.expression.match(record[target_key])
        record[target_key] = record[target_key].gsub(replace.expression, replace.replace)
      end
    }
  end

  record = change_encoding(record) if @char_encoding
  record
end