class ActionCable::Connection::Stream

def clean_rack_hijack
  return unless @rack_hijack_io
  @event_loop.detach(@rack_hijack_io, self)
  @rack_hijack_io = nil
end

def close
  shutdown
  @socket_object.client_gone
end

def each(&callback)
  @stream_send ||= callback
end

def flush_write_buffer
  @write_lock.synchronize do
    loop do
      if @write_head.nil?
        return true if @write_buffer.empty?
        @write_head = @write_buffer.pop
      end
      written = @rack_hijack_io.write_nonblock(@write_head, exception: false)
      case written
      when :wait_writable
        return false
      when @write_head.bytesize
        @write_head = nil
      else
        @write_head = @write_head.byteslice(written, @write_head.bytesize)
        return false
      end
    end
  end
end

def hijack_rack_socket
  return unless @socket_object.env["rack.hijack"]
  @socket_object.env["rack.hijack"].call
  @rack_hijack_io = @socket_object.env["rack.hijack_io"]
  @event_loop.attach(@rack_hijack_io, self)
end

def initialize(event_loop, socket)
  @event_loop    = event_loop
  @socket_object = socket
  @stream_send   = socket.env["stream.send"]
  @rack_hijack_io = nil
  @write_lock = Mutex.new
  @write_head = nil
  @write_buffer = Queue.new
end

def receive(data)
  @socket_object.parse(data)
end

def shutdown
  clean_rack_hijack
end

def write(data)
  if @stream_send
    return @stream_send.call(data)
  end
  if @write_lock.try_lock
    begin
      if @write_head.nil? && @write_buffer.empty?
        written = @rack_hijack_io.write_nonblock(data, exception: false)
        case written
        when :wait_writable
          # proceed below
        when data.bytesize
          return data.bytesize
        else
          @write_head = data.byteslice(written, data.bytesize)
          @event_loop.writes_pending @rack_hijack_io
          return data.bytesize
        end
      end
    ensure
      @write_lock.unlock
    end
  end
  @write_buffer << data
  @event_loop.writes_pending @rack_hijack_io
  data.bytesize
rescue EOFError, Errno::ECONNRESET
  @socket_object.client_gone
end