Squid url redirector

Check-in [39b97ced92]
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Check-in [39b97ced92]

Overview
Comment:better logging deinternaliation of requests shrinking list of matching entries
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | master | trunk
Files: files | file ages | folders
SHA3-256: 39b97ced92cce9fdaf09ac85421198fd7eb7bd2c35f688fffb9b60f105cc693c
User & Date: c.kworr@d4daf22a-8aaf-11de-a64d-234b64dd91b4 on 2011-06-05 22:38:14.000
Other Links: branch diff | manifest | tags
Context
2011-09-14
07:43
connect through socket when host is omitted new config class... ugly one check-in: d2c7ba18a4 user: c.kworr@d4daf22a-8aaf-11de-a64d-234b64dd91b4 tags: master, trunk
2011-06-05
22:38
better logging deinternaliation of requests shrinking list of matching entries check-in: 39b97ced92 user: c.kworr@d4daf22a-8aaf-11de-a64d-234b64dd91b4 tags: master, trunk
2011-04-06
13:26
back to python2.7 moving to gevent check-in: 0ef24b1937 user: c.kworr@d4daf22a-8aaf-11de-a64d-234b64dd91b4 tags: master, trunk
Changes
Side-by-Side Diff Ignore Whitespace Patch
Modified squid-tagger.py from [64da6cdc94] to [f1f2f6f65a].
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if not hasattr(psycopg2.extensions, 'set_wait_callback'):
	raise ImportError("support for coroutines not available in this Psycopg version (%s)" % psycopg2.__version__)
	psycopg2.extensions.set_wait_callback(gevent_wait_callback)

# //inclusion end

# tiny wrapper around a file to make reads from it geventable
# or should i move this somewhere?

class FReadlineQueue(gevent.queue.Queue):
	# storing file descriptor, leftover
	__slots__ = frozenset(['_fd', '_tail'])

	def __init__(self, fd):
		# initialising class
		gevent.queue.Queue.__init__(self)
		# storing file descriptor
		self._fd = fd
		# using empty tail
		self._tail = ''
		# setting up event
		self._install_wait()

	def _install_wait(self):
		fileno = self._fd.fileno()
		# putting file to nonblocking mode
		fcntl.fcntl(fileno, fcntl.F_SETFL, fcntl.fcntl(fileno, fcntl.F_GETFL)  | os.O_NONBLOCK)
		# installing event handler
		gevent.core.read_event(fileno, self._wait_helper)

	def _wait_helper(self, ev, evtype):
		# reading one buffer from stream
		buf = self._fd.read(4096)
		# splitting stream by line ends
		rows = buf.split('\n')
		# adding tail to the first element if there is some tail
		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)
		if len(buf) > 0:
			# no EOF, reinstalling event handler
			gevent.core.read_event(self._fd.fileno(), self._wait_helper)
		else:
			# EOF found, sending EOF to queue
			self.put_nowait(None)

stdin = FReadlineQueue(sys.stdin)

# wrapper around syslog, can be muted
class Logger(object):
	__slots__ = frozenset(['_syslog'])

	def __init__(self):
		config.section('log')
		if config['silent'] == 'yes':
			self._syslog = None
		else:
			import syslog
			self._syslog = syslog
			self._syslog.openlog(str('squidTag'))

	def info(self, message):
		if self._syslog != None:
			self._syslog.syslog(self._syslog.LOG_INFO, message)

	def notice(self, message):
		if self._syslog != None:
			self._syslog.syslog(self._syslog.LOG_NOTICE, message)

# wrapper around database
class tagDB(object):
	__slots__ = frozenset(['_cursor', '_db'])

	def __init__(self):
		config.section('database')
		self._db = psycopg2.connect(
			database = config['database'],
			host = config['host'],
			user = config['user'],
			password = config['password'],
		)
		self._cursor = self._db.cursor()

	def _field_names(self):
		names = []
		for record in self._cursor.description:
			names.append(record.name)
		return(names)

	def check(self, site, ip_address):
		self._cursor.execute("select redirect_url, regexp from site_rule where site <@ tripdomain(%s) and netmask >>= %s order by array_length(site, 1) desc", [site, ip_address])
		return(self._cursor.fetchall())

	def dump(self):
		self._cursor.execute("select untrip(site) as site, tag::text, regexp from urls order by site, tag")
		return(self._field_names(), self._cursor.fetchall())

	def load(self, data):
		if config.options.flush_db:
			self._cursor.execute('delete from urls;')
		bundle = []
		for row in data:
			if len(row) == 2:
				bundle.append([row[0], row[1], None])
			else:
				bundle.append([row[0], row[1], row[2]])
		self._cursor.executemany("insert into urls (site, tag, regexp) values (tripdomain(%s), %s, %s)", bundle)
		self._cursor.execute("update urls set regexp = NULL where regexp = ''")
		self._db.commit()

	def load_conf(self, csv_data):
		self._cursor.execute('delete from rules;')
		bundle = []
		for row in csv_data:
			bundle.append([row[0], row[1], int(row[2]), int(row[3]), row[4], row[5], row[6]])
		self._cursor.executemany("insert into rules (netmask, redirect_url, from_weekday, to_weekday, from_time, to_time, tag) values (%s::text::cidr, %s, %s, %s, %s::text::time, %s::text::time, %s::text::text[])", bundle)
		self._db.commit()

	def dump_conf(self):
		self._cursor.execute("select netmask, redirect_url, from_weekday, to_weekday, from_time, to_time, tag::text from rules")
		return(self._field_names(), self._cursor.fetchall())

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

	def __init__(self, queue):
		self._db = tagDB()
		self._log = Logger()
		self._log.info('started\n')
		self._request = re.compile('^([0-9]+)\ (http|ftp):\/\/([-\w.:]+)\/([^ ]*)\ ([0-9.]+)\/(-|[\w\.]+)\ (-|\w+)\ (-|GET|HEAD|POST).*$')
		self._queue = queue

	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 = None
		for row in result:
			if row != None and row[0] != None:
				if row[1] != None:
					self._log.info('trying regexp "{}" versus "{}"\n'.format(row[1], url_path))
					try:
						if re.compile(row[1]).match(url_path):
							reply = row[0].format(url_path)
						else:
							continue
					except:
						self._log.info("can't compile regexp")
				else:
					reply = row[0].format(url_path)
			if reply != None:
				self.writeline('{} {}\n'.format(id, reply))
				return(True)
		self.writeline('{}\n'.format(id))

	def check(self):
		while True:
			line = self._queue.get()
			if line == None:
				break
			self._log.info('request: ' + line)
			request = self._request.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)
			else:
				self._log.info('bad request\n')
				self.writeline(line + '\n')

	def writeline(self, string):
		self._log.info('sending: ' + string)
		sys.stdout.write(string)
		sys.stdout.flush()

	def loop(self):
		pool = gevent.pool.Pool()
		pool.spawn(self.check)
		pool.join()

# this classes processes config file and substitutes default values
class Config:
	__slots__ = frozenset(['_config', '_default', '_section', 'options'])
	_default = {
		'log': {
			'silent': 'no',
		},
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					self._config.set(self._section, name, None)
			else:
				self._config.set(self._section, name, None)
		return(self._config.get(self._section, name))

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

# wrapper around syslog, can be muted
class Logger(object):
	__slots__ = frozenset(['_syslog'])

	def __init__(self):
		config.section('log')
		if config['silent'] == 'yes':
			self._syslog = None
		else:
			import syslog
			self._syslog = syslog
			self._syslog.openlog(str('squidTag'))

	def info(self, message):
		if self._syslog != None:
			self._syslog.syslog(self._syslog.LOG_INFO, message)

	def notice(self, message):
		if self._syslog != None:
			self._syslog.syslog(self._syslog.LOG_NOTICE, message)

logger = Logger()

# tiny wrapper around a file to make reads from it geventable
# or should i move this somewhere?

class FReadlineQueue(gevent.queue.Queue):
	# storing file descriptor, leftover
	__slots__ = frozenset(['_fd', '_tail'])

	def __init__(self, fd):
		# initialising class
		gevent.queue.Queue.__init__(self)
		# storing file descriptor
		self._fd = fd
		# using empty tail
		self._tail = ''
		# setting up event
		self._install_wait()

	def _install_wait(self):
		fileno = self._fd.fileno()
		# putting file to nonblocking mode
		fcntl.fcntl(fileno, fcntl.F_SETFL, fcntl.fcntl(fileno, fcntl.F_GETFL)  | os.O_NONBLOCK)
		# installing event handler
		gevent.core.read_event(fileno, self._wait_helper)

	def _wait_helper(self, ev, evtype):
		# reading one buffer from stream
		buf = self._fd.read(4096)
		# splitting stream by line ends
		rows = buf.decode('l1').split('\n')
		# adding tail to the first element if there is some tail
		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('request: ' + row)
		if len(buf) > 0:
			# no EOF, reinstalling event handler
			gevent.core.read_event(self._fd.fileno(), self._wait_helper)
		else:
			# EOF found, sending EOF to queue
			self.put_nowait(None)

stdin = FReadlineQueue(sys.stdin)

# wrapper around database
class tagDB(object):
	__slots__ = frozenset(['_cursor', '_db'])

	def __init__(self):
		config.section('database')
		self._db = psycopg2.connect(
			database = config['database'],
			host = config['host'],
			user = config['user'],
			password = config['password'],
		)
		self._cursor = self._db.cursor()

	def _field_names(self):
		names = []
		for record in self._cursor.description:
			names.append(record.name)
		return(names)

	def check(self, site, ip_address):
		self._cursor.execute("select * from (select redirect_url, regexp from site_rule where site <@ tripdomain(%s) and netmask >>= %s order by array_length(site, 1) desc) a group by redirect_url, regexp", [site, ip_address])
		return(self._cursor.fetchall())

	def dump(self):
		self._cursor.execute("select untrip(site) as site, tag::text, regexp from urls order by site, tag")
		return(self._field_names(), self._cursor.fetchall())

	def load(self, data):
		if config.options.flush_db:
			self._cursor.execute('delete from urls;')
		bundle = []
		for row in data:
			if len(row) == 2:
				bundle.append([row[0], row[1], None])
			else:
				bundle.append([row[0], row[1], row[2]])
		self._cursor.executemany("insert into urls (site, tag, regexp) values (tripdomain(%s), %s, %s)", bundle)
		self._cursor.execute("update urls set regexp = NULL where regexp = ''")
		self._db.commit()

	def load_conf(self, csv_data):
		self._cursor.execute('delete from rules;')
		bundle = []
		for row in csv_data:
			bundle.append([row[0], row[1], int(row[2]), int(row[3]), row[4], row[5], row[6]])
		self._cursor.executemany("insert into rules (netmask, redirect_url, from_weekday, to_weekday, from_time, to_time, tag) values (%s::text::cidr, %s, %s, %s, %s::text::time, %s::text::time, %s::text::text[])", bundle)
		self._db.commit()

	def dump_conf(self):
		self._cursor.execute("select netmask, redirect_url, from_weekday, to_weekday, from_time, to_time, tag::text from rules")
		return(self._field_names(), self._cursor.fetchall())

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

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

	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 = None
		#self._log.info('got {} lines from database'.format(len(result)))
		for row in result:
			if row != None and row[0] != None:
				if row[1] != None:
					self._log.info('trying regexp "{}" versus "{}"\n'.format(row[1], url_path))
					try:
						if re.compile(row[1]).match(url_path):
							reply = row[0].format(url_path)
						else:
							continue
					except:
						self._log.info("can't compile regexp")
				else:
					reply = row[0].format(url_path)
			if reply != None:
				self.writeline('{} {}\n'.format(id, reply))
				return(True)
		self.writeline('{}\n'.format(id))

	def check(self):
		while True:
			line = self._queue.get()
			if line == None:
				break
			#self._log.info('request: ' + line)
			request = self._request.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)
			else:
				self._log.info('bad request\n')
				self.writeline(line + '\n')

	def writeline(self, string):
		self._log.info('sending: ' + string)
		sys.stdout.write(string)
		sys.stdout.flush()

	def loop(self):
		pool = gevent.pool.Pool()
		pool.spawn(self.check)
		pool.join()

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', 'tag', 'regexp']
	conf_fields = ['netmask', 'redirect_url', 'from_weekday', 'to_weekday', 'from_time', 'to_time', 'tag']
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			load = tagdb.load_conf

		assert first_row == fields, 'File must contain csv data with theese columns: ' + repr(fields)
		load(csv_reader)

else:
	# main loop
	Checker(stdin).loop()
	Checker(stdin, logger).loop()