if len(self._tail) > 0:
				rows[0] = self._tail + rows[0]
			# popping out last (incomplete) element
			self._tail = rows.pop(-1)
			# dropping all complete elements to the queue
			for row in rows:
				self.put_nowait(row)
                                logger.info('< ' + row[0:1024])
		# sending EOF
		self.put_nowait(None)

stdin = FReadlineQueue(sys.stdin)

# wrapper against file handler that makes possible to queue some writes without stalling

class Checker(object):
	__slots__ = frozenset(['_db', '_log', '_queue', '_request', '_stdout'])

	def __init__(self, queue, logger):
		self._db = tagDB()
		self._log = logger
		self._log.info('started')
		self._request = re.compile('^([0-9]+)\ ((http|ftp):\/\/)?([-\w.]+)(:[0-9]+)?(\/([^ ]*))?\ ([0-9.:]+)\/(-|[\w.-]+)\ (-|\w+)\ (-|GET|HEAD|POST|CONNECT|OPTIONS).*$')
		self._queue = queue
		self._stdout = FWritelineQueue(sys.stdout)

	def process(self, id, site, ip_address, url_path, line = None):
		#self._log.info('trying {}'.format(site))
		result = self._db.check(site, ip_address)
		reply = None