Module: Datadog::Contrib::Sinatra::Tracer

Defined in:
lib/ddtrace/contrib/sinatra/tracer.rb

Overview

Datadog::Contrib::Sinatra::Tracer is a Sinatra extension which traces requests.

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.registered(app) ⇒ Object 



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# File 'lib/ddtrace/contrib/sinatra/tracer.rb', line 34

def self.registered(app)
  ::Sinatra::Base.module_eval do
    def render(engine, data, *)
      output = ''
      tracer = Datadog.configuration[:sinatra][:tracer]
      if tracer.enabled
        tracer.trace(Ext::SPAN_RENDER_TEMPLATE, span_type: Datadog::Ext::HTTP::TEMPLATE) do |span|
          # If data is a string, it is a literal template and we don't
          # want to record it.
          span.set_tag(Ext::TAG_TEMPLATE_NAME, data) if data.is_a? Symbol

          output = super
        end
      else
        output = super
      end

      output
    end
  end

  app.use TracerMiddleware

  app.before do
    return unless Datadog.configuration[:sinatra][:tracer].enabled

    span = Sinatra::Env.datadog_span(env)
    span.set_tag(Datadog::Ext::HTTP::URL, request.path)
    span.set_tag(Datadog::Ext::HTTP::METHOD, request.request_method)
  end

  app.after do
    return unless Datadog.configuration[:sinatra][:tracer].enabled

    span = Sinatra::Env.datadog_span(env)

    unless span
      Datadog::Tracer.log.error('missing request span in :after hook')
      return
    end

    span.resource = "#{request.request_method} #{@datadog_route}"
    span.set_tag(Ext::TAG_ROUTE_PATH, @datadog_route)
    span.set_tag(Datadog::Ext::HTTP::STATUS_CODE, response.status)
    span.set_error(env['sinatra.error']) if response.server_error?
  end
end

Instance Method Details

#route(verb, action) ⇒ Object 



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# File 'lib/ddtrace/contrib/sinatra/tracer.rb', line 18

def route(verb, action, *)
  # Keep track of the route name when the app is instantiated for an
  # incoming request.
  condition do
    # If the option to prepend script names is enabled, then
    # prepend the script name from the request onto the action.
    @datadog_route = if Datadog.configuration[:sinatra][:resource_script_names]
                       "#{request.script_name}#{action}"
                     else
                       action
                     end
  end

  super
end