simulated_graphite_event_based.py

# -*- coding: utf-8 -*-
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import Queue
import random
import time
import thread
from liota.dcc_comms.socket_comms import SocketDccComms
from liota.dccs.graphite import Graphite
from liota.entities.metrics.metric import Metric
from liota.entities.edge_systems.dk300_edge_system import Dk300EdgeSystem
from liota.lib.utilities.utility import read_user_config

# getting values from conf file
config = read_user_config('sampleProp.conf')

comms_channel = Queue.Queue() # channel between device and a udm used for a metric

#simulates a device putting data into a comms channel at random intervals
def simulated_event_device(write_channel):
    while(True):
        time.sleep(random.randint(1,10))
        write_channel.put(random.randint(1,300))

# starting the simulated device
thread.start_new_thread(simulated_event_device, (comms_channel,))

def udm1():
    return comms_channel.get(block=True)

#---------------------------------------------------------------------------
# In this example, we demonstrate how an event stream of data can be directed to graphite
# data center component using Liota by setting sampling_interval_sec parameter to zero.

if __name__ == '__main__':

    edge_system = Dk300EdgeSystem(config['EdgeSystemName'])

    # Sending data to Graphite data center component
    # Socket is the underlying transport used to connect to the Graphite
    # instance
    graphite = Graphite(SocketDccComms(ip=config['GraphiteIP'],
                               port=config['GraphitePort']))
    graphite_reg_edge_system = graphite.register(edge_system)

    metric_name = config['MetricName']
    content_metric = Metric(
        name=metric_name,
        unit=None,
        interval=0,
        aggregation_size=6,
        sampling_function=udm1
    )
    reg_content_metric = graphite.register(content_metric)
    graphite.create_relationship(graphite_reg_edge_system, reg_content_metric)
    reg_content_metric.start_collecting()