Class: AppPerfRpm::Instruments::Rack

Inherits:
Object
  • Object
show all
Defined in:
lib/app_perf_rpm/instruments/rack.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ Rack

include AppPerfRpm::Instruments::RackModule



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# File 'lib/app_perf_rpm/instruments/rack.rb', line 56

def initialize(app)
  @app = app
end

Instance Attribute Details

#app ⇒ Object (readonly)

Returns the value of attribute app.



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# File 'lib/app_perf_rpm/instruments/rack.rb', line 52

def app
  @app
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/app_perf_rpm/instruments/rack.rb', line 60

def call(env)
  req = ::Rack::Request.new(env)

  unless ignore_path?(req.path)
    extracted_ctx = AppPerfRpm.tracer.extract(OpenTracing::FORMAT_RACK, env)
    AppPerfRpm::Tracer.sample!(extracted_ctx, !!req.params["app-perf-sample"])

    if AppPerfRpm::Tracer.tracing?
      span = AppPerfRpm.tracer.start_span(@app.class.name, :child_of => extracted_ctx, tags: {
        "component" => "Rack",
        "span.kind" => "client"
      })
      AppPerfRpm::Utils.log_source_and_backtrace(span, :rack)
    end
  end

  status, headers, response = @app.call(env)

  if span
    span.set_tag "peer.address", req.host
    span.set_tag "peer.port", req.port
    span.set_tag "http.method", req.request_method
    span.set_tag "http.url", req.path
    span.set_tag "http.status_code", status
  end

  [status, headers, response]
rescue Exception => e
  if span
    span.set_tag('error', true)
    span.log_error(e)
  end
  raise
ensure
  span.finish if span
  AppPerfRpm::Tracer.sample_off!
end

#ignore_path?(path) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/app_perf_rpm/instruments/rack.rb', line 98

def ignore_path?(path)
  path.to_s =~ AppPerfRpm.config.ignore_paths
end