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
 2 
 3 import sys
 4 import os
 5 from subprocess import Popen,PIPE
 6 
 7 class Process(object):
 8 
 9     def __init__(self,name,pfile,workdir):
10         self.name = name
11         self.pfile = pfile
12         self.workdir = workdir
13         self._init()
14 
15     def _init(self):
16         if os.path.exists(self.workdir):
17             os.chdir(self.workdir)
18         else:
19             os.makedirs(self.workdir)
20             os.chdir(self.workdir)
21 
22     def _pidfile(self):
23         return os.path.join(self.workdir,self.pfile)
24 
25     def _writepid(self):
26         if self.pid:
27             with open(self.pfile,'w') as fd:
28                  fd.write('%s' % self.pid)
29 
30     def _getpid(self):
31         p = Popen(['pidof','nginx'],stdout=PIPE)
32         return p.stdout.read()
33 
34     def start(self):
35         cmd = self.name
36         if self._getpid():
37             sys.exit('The %s are started!!' % self.name)
38         else:
39             p = Popen(cmd,stdout=PIPE,shell=True)
40             self.pid = (p.pid + 1)
41             self._writepid()
42             print('The %s is start ' % self.name)
43 
44     def stop(self):
45         if self._getpid():
46             for pid in self._getpid().strip().split():
47                 os.kill(int(pid),15)
48             if os.path.exists(self._pidfile()):
49                 os.remove(self._pidfile())
50             print('The %s is stopped... ' % self.name)
51         else:
52             print('The %s is not running...' % self.name)
53 
54     def restart(self):
55         self.stop()
56         self.start()
57 
58     def status(self):
59         if self._getpid():
60             print('The %s status is  running...' %  self.name)
61         else:
62             print('The %s status is stopped ...' % self.name)
63 
64     def reload(self):
65         os.system('%s -s reload' % self.name)
66         print('The %s is reload Successful !' % self.name )
67 
68     def help(self):
69         print('Usage: %s {start|stop|restart|reload}' % __file__)
70 
71 def main():
72     name = '/usr/sbin/nginx'
73     workdir = '/var/run/nginx'
74     pfile = 'nginx.pid'
75     nginx = Process(name,pfile,workdir)
76     try:
77         para = sys.argv[1]
78     except IndexError as e:
79         sys.exit(e)
80     if para == 'start':
81         nginx.start()
82     elif para == 'stop':
83         nginx.stop()
84     elif para == 'restart':
85         nginx.restart()
86     elif para == 'status':
87         nginx.status()
88     elif para == 'reload':
89         nginx.reload()
90     else:
91         nginx.help()
92 
93 
94 if __name__ == '__main__':
95         main()