Class: Fluent::Plugin::DockerMetadataFilter

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

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ DockerMetadataFilter

Returns a new instance of DockerMetadataFilter.



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# File 'lib/fluent/plugin/filter_docker_metadata.rb', line 24

def initialize
  super
end

Class Method Details

.get_metadata(container_id) ⇒ Object 



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# File 'lib/fluent/plugin/filter_docker_metadata.rb', line 16

def self.get_metadata(container_id)
  begin
    Docker::Container.get(container_id).info
  rescue Docker::Error::NotFoundError
    nil
  end
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/filter_docker_metadata.rb', line 28

def configure(conf)
  super

  require 'docker'
  require 'json'
  require 'lru_redux'

  Docker.url = @docker_url

  @cache = LruRedux::ThreadSafeCache.new(@cache_size)
  @container_id_regexp_compiled = Regexp.compile(@container_id_regexp)
end

#filter_stream(tag, es) ⇒ Object 



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# File 'lib/fluent/plugin/filter_docker_metadata.rb', line 41

def filter_stream(tag, es)
  new_es = es
  container_id = tag.match(@container_id_regexp_compiled)
  if container_id && container_id[0]
    container_id = container_id[0]
    metadata = @cache.getset(container_id){DockerMetadataFilter.get_metadata(container_id)}

    if metadata
      new_es = Fluent::MultiEventStream.new

      es.each {|time, record|
        record.merge!({
          'container_id' => metadata['id'],
          'container_name' => metadata['Name'][1..-1],
          'container_hostname' => metadata['Config']['Hostname']
        })

        record.merge!({'container_image' => metadata['Config']['Image'] }) if @image_name
        record.merge!({'image_id' => metadata['Image']}) if @image_id

        @labels.split(@keys_delimiter).each do |pattern_name|
          lable, caption = pattern_name.split(@values_delimiter)
          raise ConfigError, "label caption is needed" if caption.nil?
          record.merge!({"#{caption}" => metadata['Config']['Labels'][lable].to_s}) unless metadata['Config']['Labels'][lable].nil?
        end
        new_es.add(time, record)
      }
    end
  end

  return new_es
end