Module: Datadog::Core::Environment::Container

Defined in:
lib/datadog/core/environment/container.rb

Overview

For container environments

Defined Under Namespace

Classes: Descriptor

Constant Summary collapse

UUID_PATTERN = 
'[0-9a-f]{8}[-_]?[0-9a-f]{4}[-_]?[0-9a-f]{4}[-_]?[0-9a-f]{4}[-_]?[0-9a-f]{12}'
CONTAINER_PATTERN = 
'[0-9a-f]{64}'
PLATFORM_REGEX = 
/(?<platform>.*?)(?:.slice)?$/.freeze
POD_REGEX = 
/(?<pod>(pod)?#{UUID_PATTERN})(?:.slice)?$/.freeze
CONTAINER_REGEX = 
/(?<container>#{UUID_PATTERN}|#{CONTAINER_PATTERN})(?:.scope)?$/.freeze
FARGATE_14_CONTAINER_REGEX = 
/(?<container>[0-9a-f]{32}-[0-9]{1,10})/.freeze

Class Method Summary collapse

Class Method Details

.container_id ⇒ Object 



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# File 'lib/datadog/core/environment/container.rb', line 30

def container_id
  descriptor.container_id
end

.descriptor ⇒ Object 



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# File 'lib/datadog/core/environment/container.rb', line 38

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

        # Read info from path
        next if parts.empty?

        platform = parts[0][PLATFORM_REGEX, :platform]
        container_id, task_uid = nil

        case parts.length
        when 0..1
          next
        when 2
          container_id = parts[-1][CONTAINER_REGEX, :container] \
                        || parts[-1][FARGATE_14_CONTAINER_REGEX, :container]
        else
          if (container_id = parts[-1][CONTAINER_REGEX, :container])
            task_uid = parts[-2][POD_REGEX, :pod] || parts[1][POD_REGEX, :pod]
          else
            container_id = parts[-1][FARGATE_14_CONTAINER_REGEX, :container]
          end
        end

        # 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.class.name} #{e.message} " \
        "Location: #{Array(e.backtrace).first}"
      )
    end
  end
end

.platform ⇒ Object 



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# File 'lib/datadog/core/environment/container.rb', line 26

def platform
  descriptor.platform
end

.task_uid ⇒ Object 



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# File 'lib/datadog/core/environment/container.rb', line 34

def task_uid
  descriptor.task_uid
end