Python編寫memcached啟動指令碼

測試環境：CentOS 7

Python版本： 2.7

安裝memcached：輸入下面命令安裝並用指令碼測試

yum install -y memcached libmemcached libevent

測試方法：把指令碼內容貼上到rc.py檔案中，shell下執行如果下命令：

python rc.py start

一、rc 指令碼的start、stop、restart、status方法

#/usr/bin/env python
# -*- coding:utf-8 -*-
# @time   :2018/12/7 19:11
# @Author :FengXiaoqing
# @file   :rc.py
import os
import sys
from subprocess import Popen,PIPE
class Process(object):
    '''memcached rc script'''
    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 _writhPid(self):
        if self.pid:
            with open(self._pidFile(),'w') as fd:
                fd.write(str(self.pid))

    def start(self):
        pid = self._getPid()
        if pid:
            print "%s is already runnig..." % self.name
            sys.exit()
        self._init()
        cmd = self.program + ' ' + self.args
        p = Popen(cmd,stdout=PIPE,shell=True)
        self.pid = p.pid
        self._writhPid()
        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 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,
                 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()
 

二、rc指令碼的(以daemon方式啟動)

#/usr/bin/env python
# -*- coding:utf-8 -*-
# @time   :2018/12/7 21:18
# @Author :FengXiaoqing
# @file   :rc-d.py
import os
import sys
from subprocess import Popen,PIPE
class Process(object):
    '''memcached rc script'''
    args = {'USER':'memcached',
            'PORT':11211,
            'MAXCONN':1024,
            'CACHESIZE':64,
            'OPTIONS': ''}
    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 _writhPid(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']] 
        return options
    def start(self):
        pid = self._getPid()
        if pid:
            print "%s is already runnig..." % self.name
            sys.exit()
        self._init()
        cmd = [self.program]+self._parseArgs()+['-d','-P',self._pidFile()]
        p = Popen(cmd,stdout=PIPE)
        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 running..." % self.name
    def help(self):
        print ("Usage: %s {start|stop|status|restart}") % __file__
def main():
    name = 'memcached'
    prog = '/usr/bin/memcached'
    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()