Class: WebSocket::Driver::Hybi

Inherits:
WebSocket::Driver show all
Defined in:
lib/websocket/driver/hybi.rb,
lib/websocket/driver/hybi/frame.rb,
lib/websocket/driver/hybi/message.rb,
lib/websocket/driver/hybi/stream_reader.rb

Direct Known Subclasses

Client

Defined Under Namespace

Classes: Frame, Message, StreamReader

Constant Summary collapse

GUID = 
'258EAFA5-E914-47DA-95CA-C5AB0DC85B11'
BYTE = 
0b11111111
FIN = 
MASK = 0b10000000
RSV1 = 
0b01000000
RSV2 = 
0b00100000
RSV3 = 
0b00010000
OPCODE = 
0b00001111
LENGTH = 
0b01111111
OPCODES = 
{
  :continuation => 0,
  :text         => 1,
  :binary       => 2,
  :close        => 8,
  :ping         => 9,
  :pong         => 10
}
OPCODE_CODES = 
OPCODES.values
MESSAGE_OPCODES = 
OPCODES.values_at(:continuation, :text, :binary)
OPENING_OPCODES = 
OPCODES.values_at(:text, :binary)
ERRORS = 
{
  :normal_closure       => 1000,
  :going_away           => 1001,
  :protocol_error       => 1002,
  :unacceptable         => 1003,
  :encoding_error       => 1007,
  :policy_violation     => 1008,
  :too_large            => 1009,
  :extension_error      => 1010,
  :unexpected_condition => 1011
}
ERROR_CODES = 
ERRORS.values
MIN_RESERVED_ERROR = 
3000
MAX_RESERVED_ERROR = 
4999

Constants inherited from WebSocket::Driver

ConfigurationError, MAX_LENGTH, ProtocolError, STATES

Instance Attribute Summary

Attributes inherited from WebSocket::Driver

#protocol, #ready_state

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from WebSocket::Driver

#set_header, #start, #state

Methods included from EventEmitter

#add_listener, #emit, #listener_count, #listeners, #on, #remove_all_listeners, #remove_listener

Constructor Details

#initialize(socket, options = {}) ⇒ Hybi

Returns a new instance of Hybi.



54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
 
# File 'lib/websocket/driver/hybi.rb', line 54

def initialize(socket, options = {})
  super

  @extensions      = ::WebSocket::Extensions.new
  @reader          = StreamReader.new
  @stage           = 0
  @masking         = options[:masking]
  @protocols       = options[:protocols] || []
  @protocols       = @protocols.strip.split(/ *, */) if String === @protocols
  @require_masking = options[:require_masking]
  @ping_callbacks  = {}

  return unless @socket.respond_to?(:env)

  sec_key = @socket.env['HTTP_SEC_WEBSOCKET_KEY']
  protos  = @socket.env['HTTP_SEC_WEBSOCKET_PROTOCOL']

  @headers['Upgrade'] = 'websocket'
  @headers['Connection'] = 'Upgrade'
  @headers['Sec-WebSocket-Accept'] = Hybi.generate_accept(sec_key)

  if protos = @socket.env['HTTP_SEC_WEBSOCKET_PROTOCOL']
    protos = protos.split(/ *, */) if String === protos
    @protocol = protos.find { |p| @protocols.include?(p) }
    @headers['Sec-WebSocket-Protocol'] = @protocol if @protocol
  end
end

Class Method Details

.generate_accept(key) ⇒ Object 



11
12
13
 
# File 'lib/websocket/driver/hybi.rb', line 11

def self.generate_accept(key)
  Base64.encode64(Digest::SHA1.digest(key + GUID)).strip
end

Instance Method Details

#add_extension(extension) ⇒ Object 



86
87
88
89
 
# File 'lib/websocket/driver/hybi.rb', line 86

def add_extension(extension)
  @extensions.add(extension)
  true
end

#binary(message) ⇒ Object 



132
133
134
 
# File 'lib/websocket/driver/hybi.rb', line 132

def binary(message)
  frame(message, :binary)
end

#close(reason = nil, code = nil) ⇒ Object 



141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
 
# File 'lib/websocket/driver/hybi.rb', line 141

def close(reason = nil, code = nil)
  reason ||= ''
  code   ||= ERRORS[:normal_closure]

  if @ready_state <= 0
    @ready_state = 3
    emit(:close, CloseEvent.new(code, reason))
    true
  elsif @ready_state == 1
    frame(reason, :close, code)
    @ready_state = 2
    true
  else
    false
  end
end

#frame(data, type = nil, code = nil) ⇒ Object 



158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
 
# File 'lib/websocket/driver/hybi.rb', line 158

def frame(data, type = nil, code = nil)
  return queue([data, type, code]) if @ready_state <= 0
  return false unless @ready_state == 1

  message = Message.new
  frame   = Frame.new
  is_text = String === data

  message.rsv1   = message.rsv2 = message.rsv3 = false
  message.opcode = OPCODES[type || (is_text ? :text : :binary)]

  payload = is_text ? data.bytes.to_a : data
  if code
    payload = [(code >> 8) & BYTE, code & BYTE, *payload]
  end
  message.data = payload.pack('C*')

  if MESSAGE_OPCODES.include?(message.opcode)
    message = @extensions.process_outgoing_message(message)
  end

  frame.final       = true
  frame.rsv1        = message.rsv1
  frame.rsv2        = message.rsv2
  frame.rsv3        = message.rsv3
  frame.opcode      = message.opcode
  frame.masked      = !!@masking
  frame.masking_key = SecureRandom.random_bytes(4) if frame.masked
  frame.length      = message.data.bytesize
  frame.payload     = message.data

  send_frame(frame)
  true
end

#parse(data) ⇒ Object 



91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
 
# File 'lib/websocket/driver/hybi.rb', line 91

def parse(data)
  @reader.put(data)
  buffer = true
  while buffer
    case @stage
      when 0 then
        buffer = @reader.read(1)
        parse_opcode(buffer.getbyte(0)) if buffer

      when 1 then
        buffer = @reader.read(1)
        parse_length(buffer.getbyte(0)) if buffer

      when 2 then
        buffer = @reader.read(@frame.length_bytes)
        parse_extended_length(buffer) if buffer

      when 3 then
        buffer = @reader.read(4)
        if buffer
          @frame.masking_key = buffer
          @stage = 4
        end

      when 4 then
        buffer = @reader.read(@frame.length)
        if buffer
          emit_frame(buffer)
          @stage = 0
        end

      else
        buffer = nil
    end
  end
end

#ping(message = '', &callback) ⇒ Object 



136
137
138
139
 
# File 'lib/websocket/driver/hybi.rb', line 136

def ping(message = '', &callback)
  @ping_callbacks[message] = callback if callback
  frame(message, :ping)
end

#text(message) ⇒ Object 



128
129
130
 
# File 'lib/websocket/driver/hybi.rb', line 128

def text(message)
  frame(message, :text)
end

#version ⇒ Object 



82
83
84
 
# File 'lib/websocket/driver/hybi.rb', line 82

def version
  "hybi-#{@socket.env['HTTP_SEC_WEBSOCKET_VERSION']}"
end