def register_sensor():
"""Registers given sensor in the system if the provided JSON POST message is correctly formed.
An id is assigned to it and is returned"""
try:
sensor = json.loads(request.data)
with open(sensor_schema, 'r') as f:
validate(sensor, json.load(f))
except ValueError as e:
return 'JSON data is malformed: {0}'.format(e.message)
except ValidationError as e:
return 'JSON does not comply with schema: {0}'.format(e.message)
else:
name = sensor['name']
sensor_type = sensor['type']
#location_id = sensor['location']
location_name=sensor['location']
#l = models.Location.query.get(location_id)
l=models.Location.query.filter_by(name=location_name).all()
if len(l) == 0:
l=models.Location(name=location_name)
db.session.add(l)
db.session.commit()
if 'sensorRef' in sensor:
s = models.Sensor(name=name, type=sensor_type, located_in=l,sensorRef=sensor['sensorRef'])
else:
s = models.Sensor(name=name, type=sensor_type, located_in=l)
db.session.add(s)
db.session.commit()
if not isfile(schema_prefix + format_filename(sensor_type) + schema_suffix):
with open(schema_prefix + format_filename(sensor_type) + schema_suffix, 'w+') as f:
json.dump(sensor['event_definition'], f)
return "{0}".format(s.id)
else:
if 'sensorRef' in sensor:
s = models.Sensor(name=name, type=sensor_type, located_in=l[0],sensorRef=sensor['sensorRef'])
else:
s = models.Sensor(name=name, type=sensor_type, located_in=l[0])
db.session.add(s)
db.session.commit()
if not isfile(schema_prefix + format_filename(sensor_type) + schema_suffix):
with open(schema_prefix + format_filename(sensor_type) + schema_suffix, 'w+') as f:
json.dump(sensor['event_definition'], f)
return "{0}".format(s.id)
#Previous way, giving the ID.
"""if l is None:
def on_event():
"""Saves the given event from a sensor if the provided JSON POST message is correctly formed"""
try:
event = json.loads(request.data)
with open(event_schema, 'r') as f:
validate(event, json.load(f))
except ValueError as e:
return 'JSON data is malformed: {0}'.format(e.message)
except ValidationError as e:
return 'JSON does not comply with schema: {0}'.format(e.message)
else:
timestamp = int(event['timestamp'] / 1000)
value = event['value']
value=json.dumps(value)
sensor_id = event['sensor_id']
s = models.Sensor.query.get(sensor_id)
if s is None:
return 'Invalid sensor id: {0}'.format(sensor_id)
else:
s.last_alive = datetime.now()
try:
with open(schema_prefix + format_filename(s.type) + schema_suffix, 'r') as f:
validate(event['value'], json.load(f))
except ValidationError as e:
return 'JSON does not comply with schema: {0}'.format(e.message)
else:
e = models.Event(timestamp=datetime.fromtimestamp(timestamp), fired_by=s, value=str(value))
db.session.add(e)
db.session.commit()
#_append_sensor_event(e)
return "{0}".format(e.id)
def _remove_sensor(sensor):
"""Removes the given sensor from the system"""
sensor_type = sensor.type
db.session.delete(sensor)
db.session.commit()
remaining = db.session.query(models.Sensor).filter(models.Sensor.type == sensor_type).count()
if remaining == 0:
remove(schema_prefix + format_filename(sensor_type) + schema_suffix)
