Module: Datadog::Contrib::HTTP::Instrumentation::InstanceMethods

Defined in:
lib/ddtrace/contrib/http/instrumentation.rb

Overview

InstanceMethods - implementing instrumentation

Instance Method Summary collapse

Instance Method Details

#annotate_span!(span, request, response) ⇒ Object 



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# File 'lib/ddtrace/contrib/http/instrumentation.rb', line 66

def annotate_span!(span, request, response)
  span.set_tag(Datadog::Ext::HTTP::URL, request.path)
  span.set_tag(Datadog::Ext::HTTP::METHOD, request.method)
  span.set_tag(Datadog::Ext::HTTP::STATUS_CODE, response.code)

  if request.respond_to?(:uri) && request.uri
    span.set_tag(Datadog::Ext::NET::TARGET_HOST, request.uri.host)
    span.set_tag(Datadog::Ext::NET::TARGET_PORT, request.uri.port.to_s)
  else
    span.set_tag(Datadog::Ext::NET::TARGET_HOST, @address)
    span.set_tag(Datadog::Ext::NET::TARGET_PORT, @port.to_s)
  end

  # Set analytics sample rate
  Contrib::Analytics.set_sample_rate(span, analytics_sample_rate) if analytics_enabled?

  case response.code.to_i
  when 400...599
    span.set_error(response)
  end
end

#datadog_pin ⇒ Object 



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# File 'lib/ddtrace/contrib/http/instrumentation.rb', line 88

def datadog_pin
  @datadog_pin ||= begin
    service = Datadog.configuration[:http][:service_name]
    tracer = Datadog.configuration[:http][:tracer]

    Datadog::Pin.new(service, app: Ext::APP, app_type: Datadog::Ext::AppTypes::WEB, tracer: tracer)
  end
end

#request(req, body = nil, &block) ⇒ Object

:yield: response



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# File 'lib/ddtrace/contrib/http/instrumentation.rb', line 31

def request(req, body = nil, &block) # :yield: +response+
  pin = datadog_pin
  return super(req, body, &block) unless pin && pin.tracer

  if Datadog::Contrib::HTTP.should_skip_tracing?(req, @address, @port, pin.tracer)
    return super(req, body, &block)
  end

  pin.tracer.trace(Ext::SPAN_REQUEST) do |span|
    begin
      span.service = pin.service
      span.span_type = Datadog::Ext::HTTP::TYPE_OUTBOUND
      span.resource = req.method

      if pin.tracer.enabled && !Datadog::Contrib::HTTP.should_skip_distributed_tracing?(pin)
        Datadog::HTTPPropagator.inject!(span.context, req)
      end
    rescue StandardError => e
      Datadog::Tracer.log.error("error preparing span for http request: #{e}")
    ensure
      response = super(req, body, &block)
    end

    # Add additional tags to the span.
    annotate_span!(span, req, response)

    # Invoke hook, if set.
    unless Contrib::HTTP::Instrumentation.after_request.nil?
      Contrib::HTTP::Instrumentation.after_request.call(span, self, req, response)
    end

    response
  end
end