Class: Datadog::Tracing::Contrib::Sneakers::Tracer

Inherits:
Object
  • Object
show all
Defined in:
lib/datadog/tracing/contrib/sneakers/tracer.rb

Overview

Tracer is a Sneakers server-side middleware which traces executed jobs

Instance Method Summary collapse

Constructor Details

#initialize(app, *args) ⇒ Tracer

Returns a new instance of Tracer.



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# File 'lib/datadog/tracing/contrib/sneakers/tracer.rb', line 12

def initialize(app, *args)
  @app = app
  @args = args
end

Instance Method Details

#call(deserialized_msg, delivery_info, metadata, handler) ⇒ Object 



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# File 'lib/datadog/tracing/contrib/sneakers/tracer.rb', line 17

def call(deserialized_msg, delivery_info, metadata, handler)
  trace_options = {
    service: configuration[:service_name],
    span_type: Tracing::Metadata::Ext::AppTypes::TYPE_WORKER,
    on_error: configuration[:error_handler]
  }

  Tracing.trace(Ext::SPAN_JOB, **trace_options) do |request_span|
    request_span.set_tag(Contrib::Ext::Messaging::TAG_SYSTEM, Ext::TAG_MESSAGING_SYSTEM)

    request_span.set_tag(Tracing::Metadata::Ext::TAG_COMPONENT, Ext::TAG_COMPONENT)
    request_span.set_tag(Tracing::Metadata::Ext::TAG_OPERATION, Ext::TAG_OPERATION_JOB)

    # Set analytics sample rate
    if Contrib::Analytics.enabled?(configuration[:analytics_enabled])
      Contrib::Analytics.set_sample_rate(request_span, configuration[:analytics_sample_rate])
    end

    # Measure service stats
    Contrib::Analytics.set_measured(request_span)

    request_span.resource = @app.to_proc.binding.eval('self.class').to_s
    request_span.set_tag(Ext::TAG_JOB_ROUTING_KEY, delivery_info.routing_key)
    request_span.set_tag(Ext::TAG_RABBITMQ_ROUTING_KEY, delivery_info.routing_key)
    request_span.set_tag(Ext::TAG_JOB_QUEUE, delivery_info.consumer.queue.name)

    request_span.set_tag(Ext::TAG_JOB_BODY, deserialized_msg) if configuration[:tag_body]

    request_span.set_tag(Tracing::Metadata::Ext::TAG_KIND, Tracing::Metadata::Ext::SpanKind::TAG_CONSUMER)

    @app.call(deserialized_msg, delivery_info, metadata, handler)
  end
end