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

Inherits:
Object
  • Object
show all
Includes:
Contrib::HttpAnnotationHelper
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 35

def initialize(request)
  @request = request
end

Instance Method Details

#call ⇒ Object 



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# File 'lib/httpx/adapters/datadog.rb', line 39

def call
  return unless Datadog::Tracing.enabled?

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

  verb = @request.verb
  uri = @request.uri

  @span = Datadog::Tracing.trace(
    SPAN_REQUEST,
    service: service_name(@request.uri.host, configuration, Datadog.configuration_for(self)),
    span_type: TYPE_OUTBOUND
  )

  @span.resource = verb

  # Add additional request specific tags to the span.

  @span.set_tag(TAG_URL, @request.path)
  @span.set_tag(TAG_METHOD, verb)

  @span.set_tag(TAG_TARGET_HOST, uri.host)
  @span.set_tag(TAG_TARGET_PORT, uri.port.to_s)

  # Tag as an external peer service
  @span.set_tag(TAG_PEER_SERVICE, @span.service)

  Datadog::Tracing::Propagation::HTTP.inject!(Datadog::Tracing.active_trace,
                                              @request.headers) if @configuration[:distributed_tracing]

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

#finish(response) ⇒ Object 



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# File 'lib/httpx/adapters/datadog.rb', line 78

def finish(response)
  return unless @span

  if response.is_a?(::HTTPX::ErrorResponse)
    @span.set_error(response.error)
  else
    @span.set_tag(TAG_STATUS_CODE, response.status.to_s)

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

  @span.finish
end