write

# File actioncable/lib/action_cable/connection/stream.rb, line 35
      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