Class: Datadog::Contrib::HTTPX::Plugin::RequestTracer

Inherits:
Object
  • Object
show all
Defined in:
lib/httpx/adapters/datadog.rb

Constant Summary collapse

SPAN_REQUEST = 
"httpx.request"

Instance Method Summary collapse

Constructor Details

#initialize(request) ⇒ RequestTracer

Returns a new instance of RequestTracer.



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# File 'lib/httpx/adapters/datadog.rb', line 20

def initialize(request)
  @request = request
end

Instance Method Details

#call ⇒ Object 



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# File 'lib/httpx/adapters/datadog.rb', line 24

def call
  return if skip_tracing?

  @request.on(:response, &method(:finish))

  verb = @request.verb.to_s.upcase
  uri = @request.uri

  @span = datadog_pin.tracer.trace(SPAN_REQUEST)
  service_name = datadog_config[:split_by_domain] ? uri.host : datadog_pin.service_name

  begin
    @span.service = service_name
    @span.span_type = Datadog::Ext::HTTP::TYPE_OUTBOUND
    @span.resource = verb

    Datadog::HTTPPropagator.inject!(@span.context, @request.headers) if datadog_pin.tracer.enabled && !skip_distributed_tracing?

    # Add additional request specific tags to the span.

    @span.set_tag(Datadog::Ext::HTTP::URL, @request.path)
    @span.set_tag(Datadog::Ext::HTTP::METHOD, verb)

    @span.set_tag(Datadog::Ext::NET::TARGET_HOST, uri.host)
    @span.set_tag(Datadog::Ext::NET::TARGET_PORT, uri.port.to_s)

    # Tag as an external peer service
    @span.set_tag(Datadog::Ext::Integration::TAG_PEER_SERVICE, @span.service)

    # Set analytics sample rate
    if Contrib::Analytics.enabled?(datadog_config[:analytics_enabled])
      Contrib::Analytics.set_sample_rate(@span, datadog_config[:analytics_sample_rate])
    end
  rescue StandardError => e
    Datadog.logger.error("error preparing span for http request: #{e}")
  end
rescue StandardError => e
  Datadog.logger.debug("Failed to start span: #{e}")
end

#finish(response) ⇒ Object 



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# File 'lib/httpx/adapters/datadog.rb', line 64

def finish(response)
  return unless @span

  if response.is_a?(::HTTPX::ErrorResponse)
    @span.set_error(response.error)
  else
    @span.set_tag(Datadog::Ext::HTTP::STATUS_CODE, response.status.to_s)

    @span.set_error(::HTTPX::HTTPError.new(response)) if response.status >= 400 && response.status <= 599
  end

  @span.finish
end