【Python】300行代码实现crontab定时器功能 【下】

 # 只有满足条件才执行
     if self.call_condition is None or self.call_condition != self.cur_condition:
        self.call_condition = self.cur_condition
        return True
     return False
  def call(self):
     """执行定时回调"""
     try:
        self.call_able(*self.call_args)
     except Exception as e:
        print("call", self.call_able, "error:", e)
  @staticmethod
  def check_target_value(src_value, des_value):
     """检查指定值"""
     return src_value == des_value
  @staticmethod
  def check_delay_value(src_value, des_value):
     """检查每隔多久"""
        return src_value > des_value:
  @staticmethod
  def check_range_value(src_value, min_value, max_value):
     """检查区间"""
     return src_value >= min_value and src_value <= max_value
  @staticmethod
  def check_multi_value(src_value, values):
     """检查多个值"""
     return src_value in values
  @staticmethod
  def _sub_months(st, ed):
     return (ed.year - st.year)*12 + (ed.month - st.month)
  @staticmethod
  def _parse_part(value):
     """解析单个数据"""
     value = value.strip()
     if value == "*":
        return -1, -1
     # 指定时间一次
     if value.isdigit():
        return 0, int(value, 10)
     # */v 每隔多久一次
     fraction_idx = value.find("/")
     if fraction_idx >= 0 :
        denominator = value[fraction_idx + 1:]
        if not denominator.isdigit():
            return -1, -1
        if value.startswith("*"):
           return 1, int(denominator, 10)
        else:
           # 特殊区间A-B/N 每个多久，且在区间A，B内
           range_idx = value.find("-")
           if range_idx < 0:
              return -1, -1
           # 区间 + 间隔
           values = []
           range_values = value[:fraction_idx].split("-")
           if len(range_values) != 2:
              return -1, -1
           # 必须是数字，且只存在2个值
           if range_values[0].isdigit() and range_values[1].isdigit():
              values.append(int(range_values[0], 10))
              values.append(int(range_values[1], 10))
            values.append(int(denominator, 10))
            return 1, values
    # 多个时间点 A,B,...,Z
    dom_idx = value.find(",")
    if dom_idx >= 0:
       values = []
       for v in value.split(","):
           if v.isdigit():
               values.append(int(v, 10))
       return 2, values
     # 区间A-B
     range_idx = value.find("-")
     if range_idx >= 0:
         values = []
         range_values = value.split("-")
         if len(range_values) != 2:
            return -1, -1
         # 必须是数字，且只存在2个值
         if range_values[0].isdigit() and range_values[1].isdigit():
             values.append(int(range_values[0],10))
             values.append(int(range_values[1],10))
             return 3, values
         return -1, -1
    return -1, -1
class Timer:
    def __init__(self, not_thread=False):
        """创建定时器对象"""
        self._thread = None
        self._timer_data = {}
        if not not_thread:
            self._thread = threading.Thread(target=self._update, args=())
            self._thread.start()
    def register(self, time_fmt, call_able, *args):
        """注册定时器"""
        timer_data = TimerInfo(time_fmt, call_able, args)
        if not timer_data.enable:
            return
        timer_id = uuid.uuid4()
        self._timer_data[timer_id] = timer_data
        return timer_id
    def _update(self):
        """内部更新"""
        while self._thread:
            self.update(datetime.datetime.now())
            time.sleep(5)
    def update(self, date_time):
        """外部更新使用"""
        if not isinstance(date_time, datetime.datetime):
            raise TypeError("date_time must be datetime")
        remove_list = []
        for tid, node in self._timer_data.items():
            if not node.enable:
                remove_list.append(tid)
                continue
            if node.on_timer(date_time):
                node.call()
        # 删除已标记删除的定时器列表
        for tid in remove_list:
            del self._timer_data[tid]
    def remove(self, timer_id):
        """移除定时器"""
        if timer_id in self._timer_data:
            # 只标记
            self._timer_data[timer_id].enable = False