Class: BrowserChannel

Inherits:
Object
  • Object
show all
Includes:
EventMachine::Deferrable
Defined in:
lib/browser_channel.rb

Defined Under Namespace

Classes: Handler, Server, Session

Constant Summary collapse

LATEST_CHANNEL_VERSION = 
8
NOOP = 
['noop'.freeze].freeze

Instance Method Summary collapse

Constructor Details

#initialize(options, env) ⇒ BrowserChannel

Returns a new instance of BrowserChannel.



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# File 'lib/browser_channel.rb', line 186

def initialize options, env
  @options = options
  request = Rack::Request.new env
  request_GET = request.GET
  request_GET_SID = request_GET['SID']
  @session = Session.new @options, request_GET_SID, request_GET['AID']
  unless @session
    request.env['async.callback'].call [400, {}, self]
    succeed
    return
  end
  if @session.array_id == -1
    @session << ['c', @session.id, @options[:host_prefix], LATEST_CHANNEL_VERSION]
  end
  @chunked = request_GET['CI'] == '0'
  @html_data_type = request_GET['TYPE'] == 'html'
  headers = {'Cache-Control' => 'no-cache'}
  headers['Content-Type'] = @html_data_type ? 'text/html' : 'application/javascript'
  env['async.callback'].call [200, headers, self]
  if @html_data_type
    @body_callback.call "<html><body>\n"
    if domain = request_GET['DOMAIN']
      @body_callback.call "<script>try{document.domain=#{domain.dump};}catch(e){}</script>\n"
    end
  end
  if request_GET['TYPE'] == 'terminate'
    @session.terminate
    succeed
    return
  end
  if request.post? and request_GET_SID
    send_data @session.call request.POST
    return
  elsif request.get?
    # Thin calls errback when connection closes, even after success
    if @chunked
      @last_message = Time.now - ( @options[:keep_alive_interval] - @options[:keep_alive_first] )
      keep_alive 
      errback { @timer.cancel }
    end
    @session.bind self 
    errback { @session.unbind self }
  end
  send_data @session.messages unless @session.messages.empty?
end

Instance Method Details

#each(&block) ⇒ Object 



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# File 'lib/browser_channel.rb', line 241

def each &block
  @body_callback = block
end

#keep_alive ⇒ Object 



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# File 'lib/browser_channel.rb', line 232

def keep_alive
  idle = Time.now - @last_message
  if idle > @options[:keep_alive_interval]
    @session << NOOP
    idle = 0
  end
  @timer = EventMachine::Timer.new @options[:keep_alive_interval] - idle, &method(:keep_alive)
end

#send_data(messages) ⇒ Object 



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# File 'lib/browser_channel.rb', line 245

def send_data messages
  json = messages.to_json
  if @html_data_type
    @body_callback.call "<script>try{parent.m(#{json.dump});}catch(e){}</script>\n"
  else
    @body_callback.call "#{json.bytesize+1}\n#{json}\n"
  end
  @last_message = Time.now
  unless @chunked
    if @html_data_type
      @body_callback.call "<script>try{parent.d();}catch(e){}</script>\n</body></html>\n"
    end
    succeed 
  end
end