使用 python 实现 memcached 的启动服务脚本 rc

概述#!/usr/bin/python #coding:utf-8 import sys import os from subprocess import Popen, PIPE class Memcac

 

 

#!/usr/bin/python#Coding:utf-8import sysimport osfrom subprocess import Popen,PIPEclass Memcached(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.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['CACHESIZE'],'-C',self.args['MAXCONN']]        os.system('chown %s %s' % (self.args['USER'],self.workdir))        ''' 这个地方要修改工作目录的权限，用户为memcached，需要有写目录的权限。 '''        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()        # 如果程序选项中有-P选项，那么应用程序会自动去写pID文件，不用手动去写，而且要注意pID与手动写入的pID有何区别。        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'    wdir = '/var/tmp/memcached'    rc = Memcached(name,prog,wdir)    try:        cmd = sys.argv[1]    except IndexError,e:        print "Option error"        sys.exit()    if cmd == 'start':        rc.start()    elif cmd == 'stop':        rc.stop()    elif cmd == 'restart':        rc.restart()    elif cmd == 'status':        rc.status()    else:        rc.help()if __name__ == '__main__':    main()

　　

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