Contents

require 'ddtrace/ext/runtime'
require 'ddtrace/runtime/cgroup'

module Datadog
  module Runtime
    # For container environments
    module Container
      UUID_PATTERN = '[0-9a-f]{8}[-_]?[0-9a-f]{4}[-_]?[0-9a-f]{4}[-_]?[0-9a-f]{4}[-_]?[0-9a-f]{12}'.freeze
      CONTAINER_PATTERN = '[0-9a-f]{64}'.freeze

      POD_REGEX = /(pod)?(#{UUID_PATTERN})(?:.slice)?$/.freeze
      CONTAINER_REGEX = /(#{UUID_PATTERN}|#{CONTAINER_PATTERN})(?:.scope)?$/.freeze

      Descriptor = Struct.new(
        :platform,
        :container_id,
        :task_uid
      )

      module_function

      def platform
        descriptor.platform
      end

      def container_id
        descriptor.container_id
      end

      def task_uid
        descriptor.task_uid
      end

      def descriptor
        @descriptor ||= Descriptor.new.tap do |descriptor|
          begin
            Cgroup.descriptors.each do |cgroup_descriptor|
              # Parse container data from cgroup descriptor
              path = cgroup_descriptor.path
              next if path.nil?

              # Split path into parts
              parts = path.split('/')
              parts.shift # Remove leading empty part
              next if parts.length < 2

              # Read info from path
              platform = parts[0]
              container_id = parts[-1][CONTAINER_REGEX]
              task_uid = parts[-2][POD_REGEX]

              # If container ID wasn't found, ignore.
              # Path might describe a non-container environment.
              next if container_id.nil?

              descriptor.platform = platform
              descriptor.container_id = container_id
              descriptor.task_uid = task_uid

              break
            end
          rescue StandardError => e
            Datadog.logger.error(
              "Error while parsing container info. Cause: #{e.message} Location: #{e.backtrace.first}"
            )
          end
        end
      end
    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
ddtrace-0.47.0	lib/ddtrace/runtime/container.rb