from django.http import Http404, HttpResponse
from django.shortcuts import render
from django.views.decorators.csrf import csrf_exempt, csrf_protect
from xbox.control.forms import order
from redis_cache import get_redis_connection
import time
import json

@csrf_exempt
def put_order(request): #用于接收浏览器发来指令的view函数
    flag = True
    date = time.strftime("%Y%m%d%H%M%S", time.localtime())
    if request.method == 'POST':
        con = get_redis_connection('default')
        form = order(request.POST)
        if form.is_valid():
            o = form.cleaned_data['o']
            con.set('0:' + date, o) #0表示带下发指令
        else:
            flag = False
    else:
        flag = False
    return render(request, 'control.html', {'f':order()})

@csrf_exempt
def json_order(request): #用于接收手机端发来指令的view函数
    flag = True
    date = time.strftime("%Y%m%d%H%M%S", time.localtime())
    if request.method == 'POST':
        con = get_redis_connection('default')
        print request.raw_post_data
        raw = json.loads(request.raw_post_data)
        con.set('0:' + date, raw['o'])
    else:
        flag = False
    return HttpResponse(flag)

def get_order(request):
    con = get_redis_connection('default')
    lo =  con.keys('0:*')
    if lo:
        o = con.get(lo[0])
        n = lo[0].replace('0', '1', 1) #1表示已下发的历史命令
        con.rename(lo[0], n)
        return HttpResponse(o)
    else:
        return HttpResponse('echo None')

import urllib2
import json

s = 'http://localhost:8000/control/json_order/'
d = {u'o':u'touch /tmp/foobar.txt'}
retval = urllib2.urlopen(s, data=json.dumps(d)).read()
print retval

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, pidfile, stdin='/dev/null', stdout='/dev/null', stderr='/dev/null'):
        self.stdin = stdin
        self.stdout = stdout
        self.stderr = stderr
        self.pidfile = pidfile

    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
        """
        try:
            pid = os.fork()
            if pid > 0:
                # exit first parent
                sys.exit(0)
        except OSError, e:
            sys.stderr.write("fork #1 failed: %d (%s)n" % (e.errno, e.strerror))
            sys.exit(1)

        # decouple from parent environment
        os.chdir("/")
        os.setsid()
        os.umask(0)

        # do second fork
        try:
            pid = os.fork()
            if pid > 0:
                # exit from second parent
                sys.exit(0)
        except OSError, e:
            sys.stderr.write("fork #2 failed: %d (%s)n" % (e.errno, e.strerror))
            sys.exit(1)

        # redirect standard file descriptors
        sys.stdout.flush()
        sys.stderr.flush()
        si = file(self.stdin, 'r')
        so = file(self.stdout, 'a+')
        se = file(self.stderr, 'a+', 0)
        os.dup2(si.fileno(), sys.stdin.fileno())
        os.dup2(so.fileno(), sys.stdout.fileno())
        os.dup2(se.fileno(), sys.stderr.fileno())

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

#!/usr/bin/env python

import sys, time
import subprocess
import urllib
from daemon import Daemon

class MyDaemon(Daemon):
    def run(self):
        while True:
            order = urllib.urlopen('http://server-get-api/').read()
            subprocess.call(order, shell=True)
            time.sleep(30)

if __name__ == "__main__":
    daemon = MyDaemon('/tmp/daemon-example.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)