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()