Class: Rack::Runtime

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

Overview

Sets an “X-Runtime” response header, indicating the response time of the request, in seconds

You can put it right before the application to see the processing time, or before all the other middlewares to include time for them, too.

Constant Summary collapse

FORMAT_STRING = 
"%0.6f"

Instance Method Summary collapse

Constructor Details

#initialize(app, name = nil) ⇒ Runtime

Returns a new instance of Runtime.



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# File 'lib/rack/runtime.rb', line 9

def initialize(app, name = nil)
  @app = app
  @header_name = "X-Runtime"
  @header_name << "-#{name}" if name
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/rack/runtime.rb', line 16

def call(env)
  start_time = clock_time
  status, headers, body = @app.call(env)
  request_time = clock_time - start_time

  if !headers.has_key?(@header_name)
    headers[@header_name] = FORMAT_STRING % request_time
  end

  [status, headers, body]
end