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 =

:nodoc:

"%0.6f"
HEADER_NAME =

:nodoc:

"X-Runtime"

Instance Method Summary collapse

Constructor Details

#initialize(app, name = nil) ⇒ Runtime

Returns a new instance of Runtime.



14
15
16
17
18
 
# File 'lib/rack/runtime.rb', line 14

def initialize(app, name = nil)
  @app = app
  @header_name = HEADER_NAME
  @header_name += "-#{name}" if name
end

Instance Method Details

#call(env) ⇒ Object 



20
21
22
23
24
25
26
27
28
29
30
31
32
 
# File 'lib/rack/runtime.rb', line 20

def call(env)
  start_time = Utils.clock_time
  status, headers, body = @app.call(env)
  headers = Utils::HeaderHash[headers]

  request_time = Utils.clock_time - start_time

  unless headers.key?(@header_name)
    headers[@header_name] = FORMAT_STRING % request_time
  end

  [status, headers, body]
end