[root@blackfox zhouyuyao]# cat rc.memcached2.py 

#!/usr/bin/python

import sys

import os

from subprocess import Popen,PIPE

class Process(object):

    '''memcached rc script'''

    args = {'USER':'memcached',

            'PORT':11211,

            'MAXCONN':1024,

            'CACHESIZE':64,

            'OPTION':''}

    def __init__(self, name, program, args, workdir):

        self.name = name

        self.program = program

#        self.args = args

        self.workdir = workdir

    def _init(self):

        '''/var/tmp/memcached'''

        if not os.path.exists(self.workdir):

            os.mkdir(self.workdir)

            os.chdir(self.workdir)

    def _pidFile(self):

        '''/var/tmp/memcached/memcached.pid'''

        return os.path.join(self.workdir, "%s.pid" % self.name)

    def _writePid(self):

        if self.pid:

            with open(self._pidFile(),'w') as fd:

                fd.write(str(self.pid))

    def _readConf(self, f):

        with open(f) as fd:

            lines = fd.readlines()

            return dict ([i.strip().replace('"','').split('=') for i in lines])

    def _parseArgs(self):

        conf = self._readConf('/etc/sysconfig/memcached')

        if 'USER' in conf:

            self.args['USER'] = conf['USER']

        if 'PORT' in conf:

            self.args['PORT'] = conf['PORT']

        if 'MAXCONN' in conf:

            self.args['MAXCONN'] = conf['MAXCONN']

        if 'CACHESIZE' in conf:

            self.args['CACHESIZE'] = conf['CACHESIZE']

        options = ['-u',self.args['USER'],

                   '-p',self.args['PORT'],

                   '-m',self.args['MAXCONN'],

                   '-c',self.args['CACHESIZE']]

        os.system("chown %s %s" % (self.args['USER'], self.workdir))

        return options

    def start(self):

        pid = self._getPid()

        if pid:

            print "%s is running..." % self.name

            sys.exit()

        self._init()

        cmd = [self.program] + self._parseArgs() + ['-d','-P', self._pidFile()]

        print cmd

        p = Popen(cmd, stdout=PIPE)

#        self.pid = p.pid

#        self._writePid()

        print "%s start sucessful"  % self.name

    def _getPid(self):

        p = Popen(['pidof',self.name], stdout=PIPE)

        pid = p.stdout.read().strip()

        return pid

    def stop(self):

        pid = self._getPid()

        if pid:

            os.kill(int(pid), 15)

            if os.path.exists(self._pidFile()):

                os.remove(self._pidFile())

            print "%s is stopped" % self.name

    def restart(self):

        self.stop()

        self.start()

    def status(self):

        pid = self._getPid()

        if pid:

            print "%s is already running" % self.name

        else:

            print "%s is not runnning" % self.name

    def help(self):

        print "Usage: %s {start | stop | status | restart}" % __file__

def main():

    name = 'memcached'

    prog = '/usr/bin/memcached'

    args = '-u nobody -p 11211 -c 1024 -m 64'

    wd = '/var/tmp/memcached'

    pm = Process(name = name,

                  program = prog,

                  args = args,

                  workdir = wd)

    try:

        cmd = sys.argv[1]

    except IndexError, e:

        print "Option Error"

        sys.exit()

    if cmd == 'start':

        pm.start()

    elif cmd == 'stop':

        pm.stop()

    elif cmd == 'restart':

        pm.restart()

    elif cmd == 'status':

        pm.status()

    else:

        pm.help()

if __name__ == '__main__':

    main()