class Alarm(object):
""" Alarm system
"""
def __init__(self, name=None, title=None, msg=None, parent=None):
self.name = name or self.__class__.__name__
self._logger = logging.getLogger("gsensors.%s" % self.name)
self.parent = parent
self.title = title
self.msg = msg
self.id = 0
self.events = Events()
self.last_change = None # datetime on last change
self.state = 0 # 0: no alarm
@property
def active(self):
return self.state > 0
#TODO: factorise with DataSource
def _checked_callback(self, callback):
def wrapper(*args, **kwargs):
try:
callback(*args, **kwargs)
except Exception as err:
self.error = "Callback error"
self._logger.error("Callback error: %s" % err, exc_info=full_exc_info())
return wrapper
def on_trigger(self, callback):
""" Callback when alarm is triggered
"""
callback = self._checked_callback(callback)
self.events.on_trigger += callback
def on_release(self, callback):
""" Callback when alarm is release
"""
callback = self._checked_callback(callback)
self.events.on_release += callback
def trigger(self, *args, **kwargs):
""" Trigger the alarm
"""
if self.parent and self.parent.active:
return
if not self.active:
self.id += 1
self.last_change = datetime.now()
self.state = 1
self._logger.info("Trigger #%d !" % self.id)
self.events.on_trigger(self)
def release(self, *args, **kwargs):
""" Release the alarm
"""
if self.active:
self.state = 0
self.last_change = datetime.now()
self._logger.info("Release #%d !" % self.id)
self.events.on_release(self)
