Class: Fluent::Plugin::GcloudMetadataFilter

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

Defined Under Namespace

Classes: ConnectionFailure

Instance Method Summary collapse

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/filter_gcloud_metadata.rb', line 11

def configure(conf)
  super
  @map = {}
  @cache = {}
  # <record></record> directive
  conf.elements.select { |element| element.name == 'metadata' }.each do |element|
    element.each_pair do |k, v|
      element.has_key?(k) # to suppress unread configuration warning
      @map[k] = v
    end
  end
end

#filter(tag, time, record) ⇒ Object 



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

def filter(tag, time, record)
  @map.each do |recordName, pathSegment|

    if @cache.has_key?(recordName)
      record[recordName] = @cache[recordName]
      next
    end

    begin
      uri = URI.parse("http://metadata.google.internal/computeMetadata/v1/#{pathSegment}")
      request = Net::HTTP::Get.new(uri)
      request['Metadata-Flavor'] = 'Google'

      req_options = {
          use_ssl: uri.scheme == 'https',
      }

      response = Net::HTTP.start(uri.hostname, uri.port, req_options) do |http|
        http.request(request)
      end

      record[recordName] = response.body
      @cache[recordName] = record[recordName]
    rescue => e
      log.warn "failed to get metadata for #{recordName} from #{pathSegment}. ", error: e
    end
  end

  record
end