class Rack::Runtime - rack-1.6.1 Documentation

# class Rack::Runtime

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.

### Constants

FORMAT_STRING

### Public Class Methods

new(app, name = nil) click to toggle source

    # File lib/rack/runtime.rb, line 9
    def initialize(app, name = nil)
      @app = app
      @header_name = "X-Runtime"
      @header_name << "-#{name}" if name
    end

### Public Instance Methods

call(env) click to toggle source

    # 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

### Private Instance Methods

clock_time() click to toggle source

    # File lib/rack/runtime.rb, line 31
    def clock_time
      Process.clock_gettime(Process::CLOCK_MONOTONIC)
    end