python实现命令行程序的start、stop、restart

废话不多说,两个py脚本,main.py 为主脚本

main.py

#!/usr/bin/env python
# -*- coding:utf-8 -*- 

import sys, getopt, time, os  
import signal  
import multiprocessing  
from daemon import Daemon  
class JobServer(multiprocessing.Process):  
    def stopsignal(self, signum, frame):
        self.substoptag = 1
    def __init__(self):
        multiprocessing.Process.__init__(self)
        self.substoptag = 0
    def run(self):
        signal.signal(signal.SIGTERM,self.stopsignal)
        print "sub process run"
        while True:
            time.sleep(5)
            ## 这里做点事情 ##
            if self.substoptag == 1:
                print "exit sub process"
                break;

class Main(Daemon):  
    # 接收信号
    def stopsignal(self, signum, frame):
        self.stoptag    =   1
    def __init__(self, runpath, pidfile, stdin='/dev/null', stdout='/dev/null', stderr='/dev/null'):
        self.stdin   = stdin
        self.stdout  = stdout
        self.stderr  = stderr
        self.runpath = runpath
        self.pidfile = pidfile
        self.stoptag = 0
        # 进程列表
        self.procs = []
    def run(self):
        print "Job start"
        proc = [ JobServer(),"one job" ]
        self.procs.append(proc)
        # 启动一个进程
        proc[0].start()
        signal.signal(signal.SIGTERM,self.stopsignal)
        while True:
            time.sleep(5)
            if self.stoptag == 1:
                print "Job stop"
                for pro in self.procs:
                    print "stop sub process %s" % pro[1]
                    pro[0].terminate()
                break

if __name__ == "__main__":  
    # 获取运行路径
    runpath = os.path.split( os.path.realpath( sys.argv[0] ) )[0]
    # 初始化主类,并传入pid文件名
    daemon = Main(runpath, runpath + '/daemon.pid')
    if len(sys.argv) >= 2: 
        if 'start' == sys.argv[1]: 
            daemon.start()                                                                                       
        elif 'stop' == sys.argv[1]:
            daemon.stop()
        elif 'restart' == sys.argv[1]:
            daemon.restart()
        else:
            print("Unknown command")
            sys.exit(2)
        sys.exit(0)
    else:
        print("usage: %s start|stop|restart" % sys.argv[0])
        sys.exit(2)

daemon.py

#!/usr/bin/env python

import sys, os, time, atexit  
from signal import SIGTERM 

class Daemon:  
    """
    A generic daemon class.

    Usage: subclass the Daemon class and override the run() method
    """
    def __init__(self, runpath, pidfile, stdin='/dev/null', stdout='/dev/null', stderr='/dev/null'):
        self.stdin = stdin
        self.stdout = stdout
        self.stderr = stderr
        self.pidfile = pidfile
        self.runpath = runpath

    def daemonize(self):
        """
        do the UNIX double-fork magic, see Stevens' "Advanced 
        Programming in the UNIX Environment" for details (ISBN 0201563177)
        http://www.erlenstar.demon.co.uk/unix/faq_2.html#SEC16
        """
        # decouple from parent environment
        #os.chdir("/") 
        #os.setsid() 
        #os.umask(0) 

        # do second fork
        sys.stdout.flush()
        sys.stderr.flush()

        # write pidfile
        atexit.register(self.delpid)
        pid = str(os.getpid())
        file(self.pidfile,'w+').write("%s\n" % pid)

    def delpid(self):
        os.remove(self.pidfile)

    def start(self):
        """
        Start the daemon
        """
        # Check for a pidfile to see if the daemon already runs
        try:
            pf = file(self.pidfile,'r')
            pid = int(pf.read().strip())
            pf.close()
        except IOError:
            pid = None

        if pid:
            message = "pidfile %s already exist. Daemon already running?\n"
            sys.stderr.write(message % self.pidfile)
            sys.exit(1)

        # Start the daemon
        self.daemonize()
        self.run()

    def stop(self):
        """
        Stop the daemon
        """
        # Get the pid from the pidfile
        try:
            pf = file(self.pidfile,'r')
            pid = int(pf.read().strip())
            pf.close()
        except IOError:
            pid = None

        if not pid:
            message = "pidfile %s does not exist. Daemon not running?\n"
            sys.stderr.write(message % self.pidfile)
            return # not an error in a restart

        # Try killing the daemon process
        try:
            while 1:
                os.kill(pid, SIGTERM)
                time.sleep(0.1)
        except OSError, err:
            err = str(err)
            if err.find("No such process") > 0:
                if os.path.exists(self.pidfile):
                    os.remove(self.pidfile)
            else:
                print str(err)
                sys.exit(1)

    def restart(self):
        """
        Restart the daemon
        """
        self.stop()
        self.start()

    def run(self):
        """
        You should override this method when you subclass Daemon. It will be called after the process has been
        daemonized by start() or restart().
        """

使用方法

  • 后台启动 nohup ./main.py start &
  • 关闭 ./main.py stop
  • 重启 ./main.py restart