Class: Async::HTTP::Body::Slowloris

Inherits:
Writable
  • Object
show all
Defined in:
lib/async/http/body/slowloris.rb

Overview

A dynamic body which you can write to and read from.

Defined Under Namespace

Classes: ThroughputError

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Writable

#close, #closed?, #empty?, #inspect, #length, #read, #ready?

Constructor Details

#initialize(*arguments, minimum_throughput: 1024, **options) ⇒ Slowloris

In order for this implementation to work correctly, you need to use a LimitedQueue.

Parameters:

  • minimum_throughput (Integer) (defaults to: 1024)

    the minimum bytes per second otherwise this body will be forcefully closed.


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# File 'lib/async/http/body/slowloris.rb', line 40

def initialize(*arguments, minimum_throughput: 1024, **options)
	super(*arguments, **options)
	
	@minimum_throughput = minimum_throughput
	
	@last_write_at = nil
	@last_chunk_size = nil
end

Instance Attribute Details

#minimum_throughputObject (readonly)

Returns the value of attribute minimum_throughput.


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# File 'lib/async/http/body/slowloris.rb', line 49

def minimum_throughput
  @minimum_throughput
end

Instance Method Details

#write(chunk) ⇒ Object

If #read is called regularly to maintain throughput, that is good. If #read is not called, that is a problem. Throughput is dependent on data being available, from #write, so it doesn't seem particularly problimatic to do this check in #write.


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# File 'lib/async/http/body/slowloris.rb', line 52

def write(chunk)
	if @last_chunk_size
		time_since_last_write = Async::Clock.now - @last_write_at
		throughput = @last_chunk_size / time_since_last_write
		
		if throughput < @minimum_throughput
			error = ThroughputError.new(throughput, @minimum_throughput, time_since_last_write)
			
			self.close(error)
		end
	end
	
	super.tap do
		@last_write_at = Async::Clock.now
		@last_chunk_size = chunk&.bytesize
	end
end