Class: Gitlab::Middleware::Speedscope

Inherits:
Object
  • Object
show all
Defined in:
lib/gitlab/middleware/speedscope.rb

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ Speedscope

Returns a new instance of Speedscope.



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# File 'lib/gitlab/middleware/speedscope.rb', line 6

def initialize(app)
  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/gitlab/middleware/speedscope.rb', line 10

def call(env)
  request = ActionDispatch::Request.new(env)

  return @app.call(env) unless rendering_flamegraph?(request)

  body = nil

  ::Gitlab::SafeRequestStore[:capturing_flamegraph] = true

  require 'stackprof'

  begin
    mode = stackprof_mode(request)
    flamegraph = ::StackProf.run(
      mode: mode,
      raw: true,
      aggregate: false,
      interval: ::Gitlab::StackProf.interval(mode)
    ) do
      _, _, body = @app.call(env)
    end
  ensure
    body.close if body.respond_to?(:close)
  end

  if request.accept == 'application/json'
    render_flamegraph_json(flamegraph)
  else
    render_flamegraph_html(flamegraph, request)
  end
end