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""" def __init__(self, create_time=None): self._create_time = create_time or time.time self._creation_time = self._create_time() self._last_time = self._creation_time def time(self): return self._create_time() def since_start(self): return self._create_time() - self._creation_time def since_reset(self): return self._create_time() - self._last_time def reset(self): self._last_time = self._create_time() class Monitor(Timer): """ A monitor tracks the number of pings it received during it's lifetime and since the last reset. The component being monitored is responsible for calling C{ping()} everytime a monitored activity occurs. It should register a reactor event that logs statistics from this monitor every N seconds. Essentially, monitors are just statistics checkers that components can use to monitor themselves. """ def __init__(self, event_name, create_time=None): super(Monitor, self).__init__(create_time=create_time) self.event_name = event_name self.count = 0 self.total_count = 0 def ping(self): self.count += 1 self.total_count += 1 def reset(self): super(Monitor, self).reset() self.count = 0 def log(self): logging.info("%d %s events occurred in the last %s.", self.count, self.event_name, format_delta(self.since_reset())) self.reset() class BurstMonitor(Monitor): """ A burst monitor tracks the volume pings it receives. It goes into warn mode when too many pings are received in a short period of time. """ def __init__(self, repeat_interval, maximum_count, event_name, create_time=None): super(BurstMonitor, self).__init__(event_name, create_time=create_time) self.repeat_interval = repeat_interval self.maximum_count = maximum_count self._last_times = [] def ping(self): super(BurstMonitor, self).ping() now = self.time() self._last_times.append(now) if (self._last_times[0] - now > self.repeat_interval or len(self._last_times) > self.maximum_count + 1 ): self._last_times.pop(0) def warn(self): if not self._last_times: return False delta = self.time() - self._last_times[0] return (delta < self.repeat_interval and len(self._last_times) >= self.maximum_count + 1) class CoverageMonitor(Monitor): """ A coverage monitor tracks the volume of pings received since the last reset. It has normal and warn states that are determined by calculating the number of expected pings since the last reset. If the actual number of pings falls below the minimum required percent the monitor goes into warn mode. The component being monitored should register a reactor event that logs statistics from this monitor every N seconds. """ def __init__(self, repeat_interval, min_percent, event_name, create_time=None): super(CoverageMonitor, self).__init__(event_name, create_time=create_time) self.repeat_interval = repeat_interval self.min_percent = min_percent @property def percent(self): try: return self.count / float(self.expected_count) except ZeroDivisionError: return 1.0 @property def expected_count(self): return int(self.since_reset() / self.repeat_interval) def log(self): percent = 0.0 if self.percent and self.expected_count: percent = self.percent * 100 log = logging.info if self.warn(): log = logging.warning log("%d of %d expected %s events (%s) occurred in the last %s.", self.count, self.expected_count, self.event_name, format_percent(percent), format_delta(self.since_reset())) self.reset() def warn(self): if self.repeat_interval and self.min_percent: if not self.expected_count: return False if self.percent < self.min_percent: return True return False class FrequencyMonitor(Monitor): """ A frequency monitor tracks the number of pings received during a fixed period of time. It has normal and warn states; a warn state is triggered when the minimum expected pings were not received during the specified interval. The component being monitored should register a reactor event that checks the warn state of this monitor every N seconds. """ def __init__(self, repeat_interval, min_frequency, event_name, create_time=None): super(FrequencyMonitor, self).__init__(event_name, create_time=create_time) self.repeat_interval = repeat_interval self.min_frequency = min_frequency self._last_count = self._create_time() @property def expected_count(self): since_ping = self._create_time() - self._last_count return since_ping // self.repeat_interval def ping(self): super(FrequencyMonitor, self).ping() self._last_count = self._create_time() def log(self): if self.warn(): logging.warning("Only %d of %d minimum expected %s events " "occurred in the last %s.", self.count, self.expected_count, self.event_name, format_delta(self.repeat_interval)) self.reset() def warn(self): if self.repeat_interval and self.min_frequency: if ((self._create_time() - self._last_count >= self.repeat_interval) and self.count < self.min_frequency ): return True return False