def check(self, site, ip_address):
		if self._check_stmt == None:
			self._check_stmt = self._db.prepare("select redirect_url, regexp from site_rule where site <@ tripdomain($1) and netmask >> $2::text::inet order by array_length(site, 1) desc")
		return(self._check_stmt(site, ip_address))

	def dump(self):
		return(self._db.prepare("select untrip(site), tag, regexp from urls natural join site natural join tag order by site, tag")())

	def load(self, csv_data):
		with self._db.xact():
			if config.options.flush_db:
				self._db.execute('delete from urls;')
				if config.options.flush_site:
					self._db.execute('delete from site;');
			insertreg = self._db.prepare("select set($1, $2, $3)")
			insert = self._db.prepare("select set($1, $2)")
			for row in csv_data:
				if len(row[2]) > 0:
					insertreg(row[0], row[1], row[2])
				else:
					insert(row[0], row[1])
		self._db.execute('vacuum analyze site;')
		self._db.execute('vacuum analyze urls;')

	def load_conf(self, csv_data):
		with self._db.xact():
			self._db.execute('delete from rules;')
			insertconf = self._db.prepare("insert into rules (netmask, redirect_url, from_weekday, to_weekday, from_time, to_time, id_tag) values ($1::text::cidr, $2, $3, $4, $5::text::time, $6::text::time, get_tag($7::text::text[]))")
			for row in csv_data:
				insertconf(row[0], row[1], int(row[2]), int(row[3]), row[4], row[5], row[6])
		self._db.execute('vacuum analyze rules;')

	def dump_conf(self):
		return(self._db.prepare("select netmask, redirect_url, from_weekday, to_weekday, from_time, to_time, tag from rules natural join tag")())

# abstract class with basic checking functionality
class Checker:
	__slots__ = frozenset(['_db', '_log'])

	def __init__(self):
		self._db = tagDB()
		self._log = Logger()
		self._log.info('started\n')


	def process(self, id, site, ip_address, url_path, line = None):
		self._log.info('trying {}\n'.format(site))
		result = self._db.check(site, ip_address)
		reply = '-'
		for row in result:
			if row != None and row[0] != None:

						self._log.info("can't compile regexp")
				else:
					reply = row[0].format(url_path)
					break
		self.writeline('{} {}\n'.format(id, reply))

	def check(self, line):
		request = re.compile('^([0-9]+)\ (http|ftp):\/\/([-\w.:]+)\/([^ ]*)\ ([0-9.]+)\/(-|[\w\.]+)\ (-|\w+)\ (-|GET|HEAD|POST).*$').match(line)
		if request:
			id = request.group(1)
			#proto = request.group(2)
			site = request.group(3)
			url_path = request.group(4)
			ip_address = request.group(5)
			self.process(id, site, ip_address, url_path, line)

									# don't wait for more data, start processing
									timeout = 0

				# detect end of stream and exit if possible
				if kev.flags >> 15 == 1:
					self._kq.control([self._select.kevent(sys.stdin, self._select.KQ_FILTER_READ, self._select.KQ_EV_DELETE)], 0)
					eof = True


			if len(kevs) == 0:
				if len(self._queue) > 0:
					# get one request and process it
					req = self._queue.pop(0)
					Checker.process(self, req[0], req[1], req[2], req[3])
					if len(self._queue) == 0:

			default = '/usr/local/etc/squid-tagger.conf')
		parser.add_option('-d', '--dump', dest = 'dump',
			help = 'dump database', action = 'store_true', metavar = 'bool',
			default = False)
		parser.add_option('-f', '--flush-database', dest = 'flush_db',
			help = 'flush previous database on load', default = False,
			action = 'store_true', metavar = 'bool')
		parser.add_option('-F', '--flush-site', dest = 'flush_site',
			help = 'when flushing previous dtabase flush site index too',
			action = 'store_true', default = False, metavar = 'bool')
		parser.add_option('-l', '--load', dest = 'load',
			help = 'load database', action = 'store_true', metavar = 'bool',
			default = False)
		parser.add_option('-D', '--dump-conf', dest = 'dump_conf',
			help = 'dump filtering rules', default = False, metavar = 'bool',
			action = 'store_true')
		parser.add_option('-L', '--load-conf', dest = 'load_conf',

# initializing and reading in config file
config = Config()

if config.options.dump or config.options.load or config.options.dump_conf or config.options.load_conf:
	import csv

	tagdb = tagDB()
	data_fields = ['site', 'tags', 'regexp']
	conf_fields = ['netmask', 'redirect_url', 'from_weekday', 'to_weekday', 'from_time', 'to_time', 'tag']

	if config.options.dump or config.options.dump_conf:
		csv_writer = csv.writer(sys.stdout)
		if config.options.dump:
			# dumping database
			csv_writer.writerow(data_fields)
			for row in tagdb.dump():
				csv_writer.writerow([row[0], '{' + ','.join(row[1]) + '}', row[2]])

		elif config.options.dump_conf:
			# dumping rules
			csv_writer.writerow(conf_fields)
			for row in tagdb.dump_conf():
				csv_writer.writerow([row[0], row[1], row[2], row[3], row[4], row[5], '{' + ','.join(row[6]) + '}'])



	elif config.options.load or config.options.load_conf:
		csv_reader = csv.reader(sys.stdin)
		first_row = next(csv_reader)

		if config.options.load:
			# loading database
			assert first_row == data_fields, 'File must contain csv data with theese columns: ' + repr(data_fields)

			tagdb.load(csv_reader)

		elif config.options.load_conf:
			# loading database
			assert first_row == conf_fields, 'File must contain csv data with theese columns: ' + repr(conf_fields)



			tagdb.load_conf(csv_reader)

else:
	# main loop
	config.section('reactor')
	if config['reactor'] == 'thread':
		checker = CheckerThread()
	elif config['reactor'] == 'plain':
		checker = Checker()
	elif config['reactor'] == 'kqueue':
		checker = CheckerKqueue()

	checker.loop()