Class: Judoscale::RequestMiddleware

Inherits:
Object
  • Object
show all
Includes:
Logger
Defined in:
lib/judoscale/request_middleware.rb

Instance Method Summary collapse

Methods included from Logger

#logger

Constructor Details

#initialize(app) ⇒ RequestMiddleware

Returns a new instance of RequestMiddleware.



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# File 'lib/judoscale/request_middleware.rb', line 13

def initialize(app)
  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/judoscale/request_middleware.rb', line 17

def call(env)
  tracker = UtilizationTracker.instance
  tracker.start!
  tracker.incr

  request_metrics = RequestMetrics.new(env)
  store = MetricsStore.instance
  time = Time.now.utc

  if request_metrics.track_queue_time?
    queue_time = request_metrics.queue_time(time)
    network_time = request_metrics.network_time

    # NOTE: Expose queue time to the app
    env["judoscale.queue_time"] = queue_time
    store.push :qt, queue_time, time

    unless network_time.zero?
      env["judoscale.network_time"] = network_time
      store.push :nt, network_time, time
    end

    logger.debug "Request queue_time=#{queue_time}ms network_time=#{network_time}ms request_id=#{request_metrics.request_id} size=#{request_metrics.size}"
  end

  Reporter.start

  app_time, response = request_metrics.elapsed_time do
    @app.call(env)
  end
  store.push :at, app_time, time

  response
ensure
  tracker.decr
end