Module: Datadog::Tracing::Configuration::Settings

Included in:: Core::Configuration::Settings
Defined in:: lib/datadog/tracing/configuration/settings.rb
Overview

Configuration settings for tracing. rubocop:disable Metrics/AbcSize rubocop:disable Metrics/BlockLength rubocop:disable Metrics/MethodLength rubocop:disable Layout/LineLength rubocop:disable Metrics/CyclomaticComplexity rubocop:disable Metrics/PerceivedComplexity
Class Method Summary collapse

.extended(base) ⇒ Object
Class Method Details

.extended(base) ⇒ `Object`

# File 'lib/datadog/tracing/configuration/settings.rb', line 19

def self.extended(base)
  base.class_eval do
    # Tracer specific configurations.
    # @public_api
    settings :tracing do
      # Legacy [App Analytics](https://docs.datadoghq.com/tracing/legacy_app_analytics/) configuration.
      #
      # @configure_with {Datadog::Tracing}
      # @deprecated Use [Trace Retention and Ingestion](https://docs.datadoghq.com/tracing/trace_retention_and_ingestion/)
      #   controls.
      # @!visibility private
      settings :analytics do
        # @default `DD_TRACE_ANALYTICS_ENABLED` environment variable, otherwise `nil`
        # @return [Boolean,nil]
        # @!visibility private
        option :enabled do |o|
          o.type :bool, nilable: true
          o.env Tracing::Configuration::Ext::Analytics::ENV_TRACE_ANALYTICS_ENABLED
        end
      end

      # An ordered, case-insensitive list of what data propagation styles the tracer will use to extract distributed tracing propagation
      # data from incoming requests and messages.
      #
      # The tracer will try to find distributed headers in the order they are present in the list provided to this option.
      # The first format to have valid data present will be used.
      #
      # @default `DD_TRACE_PROPAGATION_STYLE_EXTRACT` environment variable (comma-separated list),
      #   otherwise `['datadog','b3multi','b3']`.
      # @return [Array<String>]
      option :propagation_style_extract do |o|
        o.type :array
        o.env Tracing::Configuration::Ext::Distributed::ENV_PROPAGATION_STYLE_EXTRACT
        o.default(
          [
            Tracing::Configuration::Ext::Distributed::PROPAGATION_STYLE_DATADOG,
            Tracing::Configuration::Ext::Distributed::PROPAGATION_STYLE_TRACE_CONTEXT,
          ]
        )
        o.after_set do |styles|
          # Make values case-insensitive
          styles.map!(&:downcase)
        end
      end

      # The case-insensitive list of the data propagation styles the tracer will use to inject distributed tracing propagation
      # data into outgoing requests and messages.
      #
      # The tracer will inject data from all styles specified in this option.
      #
      # @default `DD_TRACE_PROPAGATION_STYLE_INJECT` environment variable (comma-separated list), otherwise `['datadog','tracecontext']`.
      # @return [Array<String>]
      option :propagation_style_inject do |o|
        o.type :array
        o.env Tracing::Configuration::Ext::Distributed::ENV_PROPAGATION_STYLE_INJECT
        o.default [
          Tracing::Configuration::Ext::Distributed::PROPAGATION_STYLE_DATADOG,
          Tracing::Configuration::Ext::Distributed::PROPAGATION_STYLE_TRACE_CONTEXT,
        ]
        o.after_set do |styles|
          # Make values case-insensitive
          styles.map!(&:downcase)
        end
      end

      # An ordered, case-insensitive list of what data propagation styles the tracer will use to extract distributed tracing propagation
      # data from incoming requests and inject into outgoing requests.
      #
      # This configuration is the equivalent of configuring both {propagation_style_extract}
      # {propagation_style_inject} to value set to {propagation_style}.
      #
      # @default `DD_TRACE_PROPAGATION_STYLE` environment variable (comma-separated list).
      # @return [Array<String>]
      option :propagation_style do |o|
        o.type :array
        o.env [Configuration::Ext::Distributed::ENV_PROPAGATION_STYLE, Configuration::Ext::Distributed::ENV_OTEL_PROPAGATION_STYLE]
        o.default []
        o.after_set do |styles|
          next if styles.empty?

          # Make values case-insensitive
          styles.map!(&:downcase)

          styles.select! do |s|
            if Configuration::Ext::Distributed::PROPAGATION_STYLE_SUPPORTED.include?(s)
              true
            else
              Datadog.logger.warn("Unsupported propagation style: #{s}")
              false
            end
          end
          set_option(:propagation_style_extract, styles)
          set_option(:propagation_style_inject, styles)
        end
      end

      # Strictly stop at the first successfully serialized style.
      # This prevents the tracer from enriching the extracted context with information from
      # other valid propagations styles present in the request.
      # @default `DD_TRACE_PROPAGATION_EXTRACT_FIRST` environment variable, otherwise `false`.
      # @return [Boolean]
      option :propagation_extract_first do |o|
        o.env Tracing::Configuration::Ext::Distributed::EXTRACT_FIRST
        o.default false
        o.type :bool
      end

      # Enable trace collection and span generation.
      #
      # You can use this option to disable tracing without having to
      # remove the library as a whole.
      #
      # @default `DD_TRACE_ENABLED` environment variable, otherwise `true`
      # @return [Boolean]
      option :enabled do |o|
        o.env [Tracing::Configuration::Ext::ENV_ENABLED, Tracing::Configuration::Ext::ENV_OTEL_TRACES_EXPORTER]
        o.default true
        o.type :bool
        o.env_parser do |value|
          value = value&.downcase
          # Tracing is disabled when OTEL_TRACES_EXPORTER is none or
          # DD_TRACE_ENABLED is 0 or false.
          if ['none', 'false', '0'].include?(value)
            false
          # Tracing is enabled when DD_TRACE_ENABLED is true or 1
          elsif ['true', '1'].include?(value)
            true
          else
            Datadog.logger.warn("Unsupported value for exporting datadog traces: #{value}. Traces will be sent to Datadog.")
            nil
          end
        end
      end

      # Comma-separated, case-insensitive list of header names that are reported in incoming and outgoing HTTP requests.
      #
      # Each header in the list can either be:
      # * A header name, which is mapped to the respective tags `http.request.headers.<header name>` and `http.response.headers.<header name>`.
      # * A key value pair, "header name:tag name", which is mapped to the span tag `tag name`.
      #
      # You can mix the two types of header declaration in the same list.
      # Tag names will be normalized based on the [Datadog tag normalization rules](https://docs.datadoghq.com/getting_started/tagging/#defining-tags).
      #
      # @default `DD_TRACE_HEADER_TAGS` environment variable, otherwise an empty set of tags
      # @return [Array<String>]
      option :header_tags do |o|
        o.env Configuration::Ext::ENV_HEADER_TAGS
        o.type :array
        o.default []
        o.setter { |header_tags, _| Configuration::HTTP::HeaderTags.new(header_tags) }
      end

      # Enable 128 bit trace id generation.
      #
      # @default `DD_TRACE_128_BIT_TRACEID_GENERATION_ENABLED` environment variable, otherwise `true`
      # @return [Boolean]
      option :trace_id_128_bit_generation_enabled do |o|
        o.env Tracing::Configuration::Ext::ENV_TRACE_ID_128_BIT_GENERATION_ENABLED
        o.default true
        o.type :bool
      end

      # Enable 128 bit trace id injected for logging.
      #
      # @default `DD_TRACE_128_BIT_TRACEID_LOGGING_ENABLED` environment variable, otherwise `false`
      # @return [Boolean]
      #
      # It is not supported by our backend yet. Do not enable it.
      option :trace_id_128_bit_logging_enabled do |o|
        o.env Tracing::Configuration::Ext::Correlation::ENV_TRACE_ID_128_BIT_LOGGING_ENABLED
        o.default false
        o.type :bool
      end

      # A custom tracer instance.
      #
      # It must respect the contract of {Datadog::Tracing::Tracer}.
      # It's recommended to delegate methods to {Datadog::Tracing::Tracer} to ease the implementation
      # of a custom tracer.
      #
      # This option will not return the live tracer instance: it only holds a custom tracing instance, if any.
      #
      # For internal use only.
      #
      # @default `nil`
      # @return [Object,nil]
      option :instance

      # Automatic correlation between tracing and logging.
      # @see https://docs.datadoghq.com/tracing/setup_overview/setup/ruby/#trace-correlation
      # @return [Boolean]
      option :log_injection do |o|
        o.env Tracing::Configuration::Ext::Correlation::ENV_LOGS_INJECTION_ENABLED
        o.default true
        o.type :bool
      end

      # Configures an alternative trace transport behavior, where
      # traces can be sent to the agent and backend before all spans
      # have finished.
      #
      # This is useful for long-running jobs or very large traces.
      #
      # The trace flame graph will display the partial trace as it is received and constantly
      # update with new spans as they are flushed.
      # @public_api
      settings :partial_flush do
        # Enable partial trace flushing.
        #
        # @default `false`
        # @return [Boolean]
        option :enabled, default: false, type: :bool

        # Minimum number of finished spans required in a single unfinished trace before
        # the tracer will consider that trace for partial flushing.
        #
        # This option helps preserve a minimum amount of batching in the
        # flushing process, reducing network overhead.
        #
        # This threshold only applies to unfinished traces. Traces that have finished
        # are always flushed immediately.
        #
        # @default 500
        # @return [Integer]
        option :min_spans_threshold, default: 500, type: :int
      end

      option :report_hostname do |o|
        o.env Tracing::Configuration::Ext::NET::ENV_REPORT_HOSTNAME
        o.default false
        o.type :bool
      end

      # A custom sampler instance.
      # The object must respect the {Datadog::Tracing::Sampling::Sampler} interface.
      # @default `nil`
      # @return [Object,nil]
      option :sampler

      # Client-side sampling configuration.
      # @see https://docs.datadoghq.com/tracing/trace_ingestion/mechanisms/
      # @public_api
      settings :sampling do
        # Default sampling rate for the tracer.
        #
        # If `nil`, the trace uses an automatic sampling strategy that tries to ensure
        # the collection of traces that are considered important (e.g. traces with an error, traces
        # for resources not seen recently).
        #
        # @default `DD_TRACE_SAMPLE_RATE` environment variable, otherwise `nil`.
        # @return [Float, nil]
        option :default_rate do |o|
          o.type :float, nilable: true
          o.env [Tracing::Configuration::Ext::Sampling::ENV_SAMPLE_RATE, Tracing::Configuration::Ext::Sampling::ENV_OTEL_TRACES_SAMPLER]
          o.env_parser do |value|
            # Parse the value as a float
            next if value.nil?

            value = value&.downcase
            if ['always_on', 'always_off', 'traceidratio'].include?(value)
              Datadog.logger.warn("The value '#{value}' is not yet supported. 'parentbased_#{value}' will be used instead.")
              value = "parentbased_#{value}"
            end
            # OTEL_TRACES_SAMPLER can be set to always_on, always_off, traceidratio, and/or parentbased value.
            # These values are mapped to a sample rate.
            # DD_TRACE_SAMPLE_RATE sets the sample rate to float.
            case value
            when 'parentbased_always_on'
              1.0
            when 'parentbased_always_off'
              0.0
            when 'parentbased_traceidratio'
              ENV.fetch(Tracing::Configuration::Ext::Sampling::OTEL_TRACES_SAMPLER_ARG, 1.0).to_f
            else
              value.to_f
            end
          end
        end

        # Rate limit for number of spans per second.
        #
        # Spans created above the limit will contribute to service metrics, but won't
        # have their payload stored.
        #
        # @default `DD_TRACE_RATE_LIMIT` environment variable, otherwise 100.
        # @return [Numeric,nil]
        option :rate_limit do |o|
          o.type :int, nilable: true
          o.env Tracing::Configuration::Ext::Sampling::ENV_RATE_LIMIT
          o.default 100
        end

        # Trace sampling rules.
        # These rules control whether a trace is kept or dropped by the tracer.
        #
        # The `rules` format is a String with a JSON array of objects:
        # Each object must have a `sample_rate`, and the `name` and `service` fields
        # are optional. The `sample_rate` value must be between 0.0 and 1.0 (inclusive).
        # `name` and `service` are Strings that allow the `sample_rate` to be applied only
        # to traces matching the `name` and `service`.
        #
        # @default `DD_TRACE_SAMPLING_RULES` environment variable. Otherwise `nil`.
        # @return [String,nil]
        # @public_api
        option :rules do |o|
          o.type :string, nilable: true
          o.default { ENV.fetch(Configuration::Ext::Sampling::ENV_RULES, nil) }
        end

        # Single span sampling rules.
        # These rules allow a span to be kept when its encompassing trace is dropped.
        #
        # The syntax for single span sampling rules can be found here:
        # TODO: <Single Span Sampling documentation URL here>
        #
        # @default `DD_SPAN_SAMPLING_RULES` environment variable.
        #   Otherwise, `ENV_SPAN_SAMPLING_RULES_FILE` environment variable.
        #   Otherwise `nil`.
        # @return [String,nil]
        # @public_api
        option :span_rules do |o|
          o.type :string, nilable: true
          o.default do
            rules = ENV[Tracing::Configuration::Ext::Sampling::Span::ENV_SPAN_SAMPLING_RULES]
            rules_file = ENV[Tracing::Configuration::Ext::Sampling::Span::ENV_SPAN_SAMPLING_RULES_FILE]

            if rules
              if rules_file
                Datadog.logger.warn(
                  'Both DD_SPAN_SAMPLING_RULES and DD_SPAN_SAMPLING_RULES_FILE were provided: only ' \
                    'DD_SPAN_SAMPLING_RULES will be used. Please do not provide DD_SPAN_SAMPLING_RULES_FILE when ' \
                    'also providing DD_SPAN_SAMPLING_RULES as their configuration conflicts. ' \
                    "DD_SPAN_SAMPLING_RULES_FILE=#{rules_file} DD_SPAN_SAMPLING_RULES=#{rules}"
                )
              end
              rules
            elsif rules_file
              begin
                File.read(rules_file)
              rescue => e
                # `File#read` errors have clear and actionable messages, no need to add extra exception info.
                Datadog.logger.warn(
                  "Cannot read span sampling rules file `#{rules_file}`: #{e.message}." \
                  'No span sampling rules will be applied.'
                )
                nil
              end
            end
          end
        end
      end

      # [Continuous Integration Visibility](https://docs.datadoghq.com/continuous_integration/) configuration.
      # @public_api
      settings :test_mode do
        # Enable test mode. This allows the tracer to collect spans from test runs.
        #
        # It also prevents the tracer from collecting spans in a production environment. Only use in a test environment.
        #
        # @default `DD_TRACE_TEST_MODE_ENABLED` environment variable, otherwise `false`
        # @return [Boolean]
        option :enabled do |o|
          o.type :bool
          o.default false
          o.env Tracing::Configuration::Ext::Test::ENV_MODE_ENABLED
        end

        # Use async writer in test mode
        option :async do |o|
          o.type :bool
          o.default false
        end

        option :trace_flush

        option :writer_options do |o|
          o.type :hash
          o.default({})
        end
      end

      # A custom writer instance.
      # The object must respect the {Datadog::Tracing::Writer} interface.
      #
      # This option is recommended for internal use only.
      #
      # @default `nil`
      # @return [Object,nil]
      option :writer

      # A custom {Hash} with keyword options to be passed to {Datadog::Tracing::Writer#initialize}.
      #
      # This option is recommended for internal use only.
      #
      # @default `{}`
      # @return [Hash]
      option :writer_options do |o|
        o.type :hash
        o.default({})
      end

      # Client IP configuration
      # @public_api
      settings :client_ip do
        # Whether client IP collection is enabled. When enabled client IPs from HTTP requests will
        #   be reported in traces.
        #
        # @see https://docs.datadoghq.com/tracing/configure_data_security#configuring-a-client-ip-header
        #
        # @default `DD_TRACE_CLIENT_IP_ENABLED` environment variable, otherwise `false`.
        # @return [Boolean]
        option :enabled do |o|
          o.type :bool
          o.env Tracing::Configuration::Ext::ClientIp::ENV_ENABLED
          o.default false
        end

        # An optional name of a custom header to resolve the client IP from.
        #
        # @default `DD_TRACE_CLIENT_IP_HEADER` environment variable, otherwise `nil`.
        # @return [String,nil]
        option :header_name do |o|
          o.type :string, nilable: true
          o.env Tracing::Configuration::Ext::ClientIp::ENV_HEADER_NAME
        end
      end

      # Maximum size for the `x-datadog-tags` distributed trace tags header.
      #
      # If the serialized size of distributed trace tags is larger than this value, it will
      # not be parsed if incoming, nor exported if outgoing. An error message will be logged
      # in this case.
      #
      # @default `DD_TRACE_X_DATADOG_TAGS_MAX_LENGTH` environment variable, otherwise `512`
      # @return [Integer]
      option :x_datadog_tags_max_length do |o|
        o.type :int
        o.env Tracing::Configuration::Ext::Distributed::ENV_X_DATADOG_TAGS_MAX_LENGTH
        o.default 512
      end
    end
  end
end
Module: Datadog::Tracing::Configuration::Settings

Overview

Class Method Summary collapse

Class Method Details

.extended(base) ⇒ Object

.extended(base) ⇒ `Object`
