Class: EventMachine::WebSocket::Connection

Inherits:
Connection
  • Object
show all
Defined in:
lib/em-websocket/connection.rb

Constant Summary collapse

PATH = 
/^GET (\/[^\s]*) HTTP\/1\.1$/
HEADER = 
/^([^:]+):\s*([^$]+)/

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ Connection

Returns a new instance of Connection.



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# File 'lib/em-websocket/connection.rb', line 15

def initialize(options)
  @options = options
  @debug = options[:debug] || false
  @state = :handshake
  @request = {}
  @data = ''

  debug [:initialize]
end

Instance Method Details

#dispatch ⇒ Object 



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# File 'lib/em-websocket/connection.rb', line 37

def dispatch
  while case @state
    when :handshake
      new_request
    when :upgrade
      send_upgrade
    when :connected
      process_message
    else raise RuntimeError, "invalid state: #{@state}"
    end
  end
end

#new_request ⇒ Object 



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# File 'lib/em-websocket/connection.rb', line 50

def new_request
  if @data.match(/\r\n\r\n$/)
    debug [:inbound_headers, @data]
    lines = @data.split("\r\n")

    # extract request path
    @request['Path'] = lines.shift.match(PATH)[1].strip

    # extract remaining headers
    lines.each do |line|
      h = HEADER.match(line)
      @request[h[1].strip] = h[2].strip
    end

    # transform headers
    @request['Host'] = Addressable::URI.parse("ws://"+@request['Host'])
    
    if not websocket_connection?
      send_data "HTTP/1.1 400 Bad request\r\n\r\n"
      close_connection_after_writing
      return false

    else
      @data = ''
      @state = :upgrade
      return true
    end
  end

  false
end

#onclose(&blk) ⇒ Object 



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# File 'lib/em-websocket/connection.rb', line 12

def onclose(&blk);    @onclode = blk;   end

#onmessage(&blk) ⇒ Object 



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# File 'lib/em-websocket/connection.rb', line 13

def onmessage(&blk);  @onmessage = blk; end

#onopen(&blk) ⇒ Object

define WebSocket callbacks



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# File 'lib/em-websocket/connection.rb', line 11

def onopen(&blk);     @onopen = blk;    end

#process_message ⇒ Object 



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# File 'lib/em-websocket/connection.rb', line 109

def process_message
  debug [:message, @data]
  @onmessage.call(@data) if @onmessage
  @data = ''

  false
end

#receive_data(data) ⇒ Object 



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# File 'lib/em-websocket/connection.rb', line 25

def receive_data(data)
  debug [:receive_data, data]

  @data << data
  dispatch
end

#send(data) ⇒ Object

should only be invoked after handshake, otherwise it will inject data into the header exchange

frames need to start with 0x00-0x7f byte and end with an 0xFF byte. Per spec, we can also set the first byte to a value betweent 0x80 and 0xFF, followed by a leading length indicator



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# File 'lib/em-websocket/connection.rb', line 124

def send(data)
  debug [:send, data]
  send_data("\x00#{data}\xff")
end

#send_upgrade ⇒ Object 



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# File 'lib/em-websocket/connection.rb', line 86

def send_upgrade
  location  = "ws://#{@request['Host'].host}"
  location << ":#{@request['Host'].port}" if @request['Host'].port
  location << @request['Path']

  upgrade =  "HTTP/1.1 101 Web Socket Protocol Handshake\r\n"
  upgrade << "Upgrade: WebSocket\r\n"
  upgrade << "Connection: Upgrade\r\n"
  upgrade << "WebSocket-Origin: #{@request['Origin']}\r\n"
  upgrade << "WebSocket-Location: #{location}\r\n\r\n"

  # upgrade connection and notify client callback
  # about completed handshake
  debug [:upgrade_headers, upgrade]
  send_data upgrade

  @state = :connected
  @onopen.call if @onopen

  # stop dispatch, wait for messages
  false
end

#unbind ⇒ Object 



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# File 'lib/em-websocket/connection.rb', line 32

def unbind
  debug [:unbind, :connection]
  @onclose.call if @onclose
end

#websocket_connection? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/em-websocket/connection.rb', line 82

def websocket_connection?
  @request['Connection'] == 'Upgrade' and @request['Upgrade'] == 'WebSocket'
end