Class: PermessageDeflate::Session

Inherits:
Object
  • Object
show all
Defined in:
lib/permessage_deflate/session.rb

Direct Known Subclasses

ClientSession, ServerSession

Constant Summary collapse

VALID_PARAMS = 
[
  'server_no_context_takeover',
  'client_no_context_takeover',
  'server_max_window_bits',
  'client_max_window_bits'
]
MIN_WINDOW_BITS = 
9
MAX_WINDOW_BITS = 
15
VALID_WINDOW_BITS = 
[8, 9, 10, 11, 12, 13, 14, 15]

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ Session

Returns a new instance of Session.



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# File 'lib/permessage_deflate/session.rb', line 34

def initialize(options)
  @level     = options.fetch(:level,     Zlib::DEFAULT_COMPRESSION)
  @mem_level = options.fetch(:mem_level, Zlib::DEF_MEM_LEVEL)
  @strategy  = options.fetch(:strategy,  Zlib::DEFAULT_STRATEGY)

  @accept_no_context_takeover  = options.fetch(:no_context_takeover, false)
  @accept_max_window_bits      = options.fetch(:max_window_bits, nil)
  @request_no_context_takeover = options.fetch(:request_no_context_takeover, false)
  @request_max_window_bits     = options.fetch(:request_max_window_bits, nil)

  @deflate = @inflate = nil
end

Class Method Details

.valid_params?(params) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/permessage_deflate/session.rb', line 15

def self.valid_params?(params)
  return false unless params.keys.all? { |k| VALID_PARAMS.include?(k) }
  return false if params.values.grep(Array).any?

  if params.has_key?('server_no_context_takeover')
    return false unless params['server_no_context_takeover'] == true
  end

  if params.has_key?('client_no_context_takeover')
    return false unless params['client_no_context_takeover'] == true
  end

  if params.has_key?('server_max_window_bits')
    return false unless VALID_WINDOW_BITS.include?(params['server_max_window_bits'])
  end

  true
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/permessage_deflate/session.rb', line 69

def close
  free(@inflate)
  @inflate = nil

  free(@deflate)
  @deflate = nil
end

#process_incoming_message(message) ⇒ Object 



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# File 'lib/permessage_deflate/session.rb', line 47

def process_incoming_message(message)
  return message unless message.rsv1

  inflate = get_inflate

  message.data = inflate.inflate(message.data) +
                 inflate.inflate([0x00, 0x00, 0xff, 0xff].pack('C*'))

  free(inflate) unless @inflate
  message
end

#process_outgoing_message(message) ⇒ Object 



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# File 'lib/permessage_deflate/session.rb', line 59

def process_outgoing_message(message)
  deflate = get_deflate

  message.data = deflate.deflate(message.data, Zlib::SYNC_FLUSH)[0...-4]
  message.rsv1 = true

  free(deflate) unless @deflate
  message
end