Python daemon (multi-threaded development)

#!/usr/bin/python

import sys,time,json,logging

import Queue, threading, datetime

from lib.base.daemon import Daemon

from lib.queue.httpsqs.HttpsqsClient import HttpsqsClient

from lib.db.DbMongodb import DbMongodb

logging.basicConfig(level=logging.DEBUG,

                format='%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s',

                datefmt='%a, %d %b %Y %H:%M:%S',

                filename='myapp.log',

                filemode='w')

queue = Queue.Queue()      

httpsqs = HttpsqsClient('192.168.0.218','1218','httpsqs.com')

db = DbMongodb('192.168.0.119','testdb')

class ThreadGetHttpSqs(threading.Thread):

    def __init__(self):

        threading.Thread.__init__(self)

        self.httpsqs = httpsqs

        self.queue = queue

    def run(self):

        while True:

            data = self.httpsqs.get('logtest')

            if data is not None:

                self.queue.put(data)

                logging.info('get:id %s , tablename %s' % (self.getName(),data))

            else:

                time.sleep(3)

class ThreadInsertDB(threading.Thread):

    def __init__(self):

        threading.Thread.__init__(self)

        self.queue = queue

        self.db = db

    def run(self):

        while True:

            chunk = self.queue.get()

            s = json.loads(chunk)

            tablename = s['table']

            data = s['data']

            self.db.save(tablename,data)

            logging.info('insert:id %s , tablename %s' % (self.getName(),tablename))

            self.queue.task_done()

class MyDaemon(Daemon):

    def _run(self):

        while True:

            for i in range(2):

                t = ThreadGetHttpSqs()

                #t.setDaemon(True)

                t.start()

            for i in range(2):

                b = ThreadInsertDB()

                #t.setDaemon(True)

                b.start()

            #线程已经为永真循环，进程不能再循环

            time.wait()

if __name__ == "__main__":

    daemon = MyDaemon('/tmp/daemon-example.pid')

    if len(sys.argv) == 2:

        if 'start' == sys.argv[1]:

            daemon.start()

        elif 'stop' == sys.argv[1]:

            daemon.stop()

        elif 'restart' == sys.argv[1]:

            daemon.restart()

        else:

            print "Unknown command"

            sys.exit(2)

        sys.exit(0)

    else:

        print "usage: %s start|stop|restart" % sys.argv[0]

        sys.exit(2)