Class: RequestQueueTimeMiddleware

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

Overview

Measures the queue time (= time between receiving the request in downstream load balancer and starting request in ruby process)

Constant Summary collapse

ENV_KEY = 
'rack.request_queue_time'

Instance Method Summary collapse

Constructor Details

#initialize(app, statsd:, process: Process) ⇒ RequestQueueTimeMiddleware

Returns a new instance of RequestQueueTimeMiddleware.



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# File 'lib/rack/request_queue_time_middleware.rb', line 8

def initialize(app, statsd:, process: Process)
  @app = app
  @statsd = statsd
  @process = process
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/rack/request_queue_time_middleware.rb', line 14

def call(env)
  queue_time = measure_queue_time(env)

  report_queue_time(queue_time)

  env[ENV_KEY] = queue_time

  @app.call(env)
end