day33-python阶段性复习七

rc脚本练习

#!/usr/bin/env python
#coding:utf8
import sys
import os
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
17 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/tpm/memcached/memcached.pid'''
return os.path.join(self.workdir,"%s.pid" % self.name)
27 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 'CACHESEIZE' 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))
return options
52 def start(self):
pid = self._getPid()
if pid:
print "%s is running..." % self.name
sys.exit()
self._init()
59 cmd = [self.program] + self._parseArgs() + ['-d','-P', self._pidFile
print cmd
p = Popen(cmd, stdout=PIPE)
# self.pid = p.pid
# self._writhPid()
print "%s start Sucessful" % self.name
66 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
78 def restart(self):
self.stop()
self.start()
82
def status(self):
pid = self._getPid()
if pid:
print "%s is already runing" % self.name
else:
print "%s is not runing" % self.name
90 def help(self):
print "Usage: %s {start|stop|status|restart} " % __file__
93 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()