Module: OpenTelemetry::Instrumentation::ActiveSupport

Defined in:
lib/opentelemetry/instrumentation/active_support.rb,
lib/opentelemetry/instrumentation/active_support/version.rb,
lib/opentelemetry/instrumentation/active_support/instrumentation.rb,
lib/opentelemetry/instrumentation/active_support/span_subscriber.rb

Overview

rubocop:disable Style/Documentation

Defined Under Namespace

Classes: Instrumentation, SpanSubscriber

Constant Summary collapse

VERSION = 
'0.4.2'

Class Method Summary collapse

Class Method Details

.subscribe(tracer, pattern, notification_payload_transform = nil, disallowed_notification_payload_keys = []) ⇒ Object

A very hacky way to make sure that OpenTelemetry::Instrumentation::ActiveSupport::SpanSubscriber gets invoked first Rails 6+ https://github.com/rails/rails/blob/0f0ec9908e25af36df2d937dc431f626a4102b3d/activesupport/lib/active_support/notifications/fanout.rb#L51



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# File 'lib/opentelemetry/instrumentation/active_support/span_subscriber.rb', line 18

def self.subscribe(
  tracer,
  pattern,
  notification_payload_transform = nil,
  disallowed_notification_payload_keys = []
)
  subscriber = OpenTelemetry::Instrumentation::ActiveSupport::SpanSubscriber.new(
    name: pattern,
    tracer: tracer,
    notification_payload_transform: notification_payload_transform,
    disallowed_notification_payload_keys: disallowed_notification_payload_keys
  )

  subscriber_object = ::ActiveSupport::Notifications.subscribe(pattern, subscriber)

  ::ActiveSupport::Notifications.notifier.synchronize do
    subscribers = ::ActiveSupport::Notifications.notifier.instance_variable_get(:@string_subscribers)[pattern]

    if subscribers.nil?
      OpenTelemetry.handle_error(
        message: 'Unable to move OTEL ActiveSupport Notifications subscriber to the front of the notifications list which may cause incomplete traces.' \
                 'Please report an issue here: ' \
                 'https://github.com/open-telemetry/opentelemetry-ruby-contrib/issues/new?labels=bug&template=bug_report.md&title=ActiveSupport%20Notifications%20subscribers%20list%20is%20nil'
      )
    else
      subscribers.unshift(
        subscribers.delete(subscriber_object)
      )
    end
  end
  subscriber_object
end