def run(self):
"""
Continuously verify for the correct operation of the registered
clients
"""
import time
while True:
#sleep for a while at every loop
time.sleep(DirectoryChecker.LOOP_WAIT)
#generate the list of registered users
users = [i[0] for i in self.__directory.directory_query()]
self.__logger.debug("%d users are active" % len(users))
for username in users:
#retrieve the bind information for each user
res = self.__directory.directory_query(username)
username, address, port = res[0] if len(res) == 1 else (
username, None, None)
if address != None and port != None:
try:
self.__logger.debug("connecting to %s:%d" %
(address, port))
sock = socket.socket(socket.AF_INET,
socket.SOCK_STREAM)
sock.connect((address, port))
#use the protocol wrapper to simplify socket handling
proto = ProtocolWrapper(sock, (address, port))
#send a ping, and wait for a pong
self.__logger.debug("sending ping")
proto.send(p.T_PING)
msg = proto.recv()
if msg != None and msg.type == p.T_PONG:
self.__logger.info("USER %s OK" % username)
proto.close()
else:
raise Exception, "no PONG received"
except Exception, e:
#client is misbehaving, deregister it
self.__logger.error("USER %s ERROR (%s)" %
(username, str(e)))
self.__directory.directory_deregister(username)
def __init__(self, directory, clisock, addrinfo):
"""
The thread takes as input three arguments:
1) the instance of the directory object that accepted the connection
2) the connected socket associated with the client
3) the address info tuple
"""
threading.Thread.__init__(self)
self.username = None
self.password = None
self.bind_address = None
self.bind_port = None
self.__directory = directory
self.__protocol = ProtocolWrapper(clisock, addrinfo)
#we are not interested in joining these threads
self.daemon = True
#the logger
self.__logger = logging.getLogger("client")
