nginx启动脚本（class练习）

说明：使用类的方式编写程序启动脚本（练习）

 1 #!/usr/bin/env python

import sys
import os
from subprocess import Popen,PIPE

class Process(object):

    def __init__(self,name,pfile,workdir):
        self.name = name
        self.pfile = pfile
        self.workdir = workdir
        self._init()

    def _init(self):
        if os.path.exists(self.workdir):
            os.chdir(self.workdir)
        else:
            os.makedirs(self.workdir)
            os.chdir(self.workdir)

    def _pidfile(self):
        return os.path.join(self.workdir,self.pfile)

    def _writepid(self):
        if self.pid:
            with open(self.pfile,'w') as fd:
                 fd.write('%s' % self.pid)

    def _getpid(self):
        p = Popen(['pidof','nginx'],stdout=PIPE)
        return p.stdout.read()

    def start(self):
        cmd = self.name
        if self._getpid():
            sys.exit('The %s are started!!' % self.name)
        else:
            p = Popen(cmd,stdout=PIPE,shell=True)
            self.pid = (p.pid + 1)
            self._writepid()
            print('The %s is start ' % self.name)

    def stop(self):
        if self._getpid():
            for pid in self._getpid().strip().split():
                os.kill(int(pid),15)
            if os.path.exists(self._pidfile()):
                os.remove(self._pidfile())
            print('The %s is stopped... ' % self.name)
        else:
            print('The %s is not running...' % self.name)

    def restart(self):
        self.stop()
        self.start()

    def status(self):
        if self._getpid():
            print('The %s status is  running...' %  self.name)
        else:
            print('The %s status is stopped ...' % self.name)

    def reload(self):
        os.system('%s -s reload' % self.name)
        print('The %s is reload Successful !' % self.name )

    def help(self):
        print('Usage: %s {start|stop|restart|reload}' % __file__)

def main():
    name = '/usr/sbin/nginx'
    workdir = '/var/run/nginx'
    pfile = 'nginx.pid'
    nginx = Process(name,pfile,workdir)
    try:
        para = sys.argv[1]
    except IndexError as e:
        sys.exit(e)
    if para == 'start':
        nginx.start()
    elif para == 'stop':
        nginx.stop()
    elif para == 'restart':
        nginx.restart()
    elif para == 'status':
        nginx.status()
    elif para == 'reload':
        nginx.reload()
    else:
        nginx.help()


if __name__ == '__main__':
        main()