Python - 利用python编写的

发布时间：2019-06-26 09:48:38编辑：auto阅读（1390）

memcached作为缓存文件服务，默认是操作系统里面是可以直接yum -y install memcached进行安装的。

/etc/init.d/memcached 是属于系统shell编写的管理脚本，下面这个脚本是python脚本编写出来的memcached管理脚本，和shell编写的脚本实现的效果一样。

#!/usr/bin/python

import sys
import os
from subprocess import Popen,PIPE

class Process(object):
    '''memached rc script'''
    args = {'USER':'memcached',
            'PORT':11211,
            'MAXCONN':1024,
            'CACHESIZE':64,
            'OPTION':''}

    def __init__(self,name,program,workdir):
        self.name = name
        self.program = program
        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['CACHESIZE'],
                   '-c',self.args['MAXCONN']]
        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()]
        p = Popen(cmd,stdout=PIPE)
        #self.pid = p.pid
        #self._writePid()
        print "%s start Sucessful \t\t [OK]" % 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 \t\t\t [OK]" % 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 running" % 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,
                 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()

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