def poll_QoS(self):
"""
Gets the latest camera/object metrics from the QoS server. This
function returns a list of VidFeed objects, or None if the input data
was invalid.
"""
response = self.QoS_server.recv(self.BUFFER_SIZE)
if not response: # assume dropped connection
raise socket.error('No data received from QoS server')
try:
lines = response.decode('utf-8').splitlines()
pr = qosupdate.parse(lines)
except Exception as ex:
log('Invalid data received from server: ' + str(ex))
return None
return pr
"""
This module handles the details of communicating with the QoS server.
"""
from __future__ import print_function, with_statement
from datetime import datetime
from vidcontrol import VidFeed, VidControl
from qosupdate import parse, prepare
# Test for sample response
# NOTE: The server-sim.py program must be running for this test to execute
# successfully. This is a side effect of using the VidControl class.
if __name__ == '__main__':
with open('./sample-qos-response.txt', 'r') as f:
text = f.read()
messages = text.split('>>>\n')
for m in messages[1:]:
lines = m.splitlines()
feed_data = parse(lines)
print('\n>>>\n')
print('Timestamp: ' + str(feed_data[0]))
print('Add/update feeds:')
for x in feed_data[1]:
print('\t' + str(x))
print('Delete feeds:')
for x in feed_data[2]:
print('\t' + str(x))
