# -*- coding: utf-8 -*-
import fcntl
import os
from apps.settings import CRON_LOCK_DIR


# 尝试加锁
def try_lock(name):
  def decorator(func):
    def wrap(*args, **kwargs):
      os.makedirs(CRON_LOCK_DIR, exist_ok=True)
      with open('{}/{}'.format(CRON_LOCK_DIR, name), 'w') as fd:
        try:
          fcntl.lockf(fd, fcntl.LOCK_EX | fcntl.LOCK_NB) # 加锁
          func(*args, **kwargs)
          fcntl.lockf(fd, fcntl.LOCK_UN) # 解锁
        except: # 加锁异常跳过
          pass
    return wrap
  return decorator

class Command(BaseCommand):
  @try_lock('check_order') # 指定锁文件的名字
  def handle(self, *args, **options):
    pass