Class: Rack::Delay

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

Constant Summary collapse

HEADER = 
'X-Rack-Delay'

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app, options = {}) ⇒ Delay

Returns a new instance of Delay.



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# File 'lib/rack/delay.rb', line 7

def initialize(app, options={})
  @app     = app
  
  if options.has_key?(:unless)
    options[:if] = options.delete(:unless)
    options[:negate] = true
  end

  @options = {
      :min    => 50,     # msec
      :max    => 5000,   # msec
      :delay  => nil,
      :if     => nil,
      :negate => false
    }.merge(options)
end

Instance Attribute Details

#app ⇒ Object (readonly)

Returns the value of attribute app.



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# File 'lib/rack/delay.rb', line 5

def app
  @app
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/rack/delay.rb', line 5

def options
  @options
end

Instance Method Details

#_call_block(block, request) ⇒ Object 



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# File 'lib/rack/delay.rb', line 34

def _call_block(block, request)
  if block.arity == 0
    block.call()
  else
    block.call(request)
  end
end

#call(env) ⇒ Object 



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# File 'lib/rack/delay.rb', line 42

def call(env)
  request = Rack::Request.new(env)
  should_delay = true
  
  
  should_delay = !!_call_block(options[:if], request) if options[:if]
  should_delay = !should_delay if options[:negate]

  header_delay = 'none'
  
  if should_delay

    min_delay = options[:min]
    max_delay = options[:max]

    if options[:delay]
      ret = _call_block(options[:delay], request)
      unless ret.nil?
        ret = [ret] unless ret.kind_of?(Array)
        min_delay = ret.first
        max_delay = ret.last
      end
    end

    delay = peek_delay(min_delay, max_delay)
    header_delay = delay
    sleep(delay)
  end
  
  status , headers , response = app.call(env)
  headers[ HEADER ] = header_delay.to_s
  [status , headers , response]
end

#peek_delay(min, max) ⇒ Object 



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# File 'lib/rack/delay.rb', line 24

def peek_delay(min, max)
  if min > max
    tmp = max
    max = min
    min = tmp
  end
  return min / 1000.0 if min == max
  (min + rand(max - min)) / 1000.0
end