class Notifications(object):
instance = None
@classmethod
def get_instance(cls):
if not cls.instance:
cls.instance = Notifications()
return cls.instance
def __init__(self):
print("Creating Notifications instance")
self.notification_subscriber = rospy.Subscriber(
NOTIFICATION_TOPIC, String, self.notification_callback)
self.notifications = []
self.notification_cleanup = 0
def cleanup_notifications(self):
if self.notification_cleanup < time.time() - 5:
bak = self.notifications
self.notifications = []
for t, nt in bak:
if t > time.time() - 15:
self.notifications.append((t, nt))
def get_notifications(self, since):
self.cleanup_notifications()
return [y for x, y in self.notifications if x >= since]
def notification_callback(self, msg):
self.log("Notification received: %s" % (repr(msg)))
try:
t = time.time()
now = datetime.datetime.now()
notification = json.loads(msg.data)
notification['received'] = t
self.notifications.append((t, notification))
except ValueError, e:
self.notifications.append((time.time(), {
"message":
"Incorrectly formed notification received: \"%s\"" % msg.data,
"level":
"HIGH",
"timeout":
4000,
"received":
time.time()
}))
self.log("Generating video")
ih = ImageHandler.get_instance()
ih.generate_video()
