def monitor_ovsdb(entity_zoo, extra):
pyDatalog.Logic(extra['logic'])
cmd = [
'ovsdb-client', 'monitor', 'Interface', 'ofport', 'name',
'external_ids', '--format=json'
]
logger.info("start ovsdb-client instance")
try:
child = subprocess.Popen(cmd,
stdout=subprocess.PIPE,
preexec_fn=on_parent_exit('SIGTERM'))
with extra['lock']:
extra['ovsdb-client'] = child
logger.info("monitoring the ovsdb")
while child.poll() == None:
json_str = child.stdout.readline().strip()
output = json.loads(json_str)
with entity_zoo.lock:
for record in output['data']:
update_ovsport(record, entity_zoo)
except ValueError as err:
if json_str != "":
logger.warning("cannot parse %s to json object", json_str)
else:
logger.info('json_str is empty, maybe we should exit')
subprocess.Popen.kill(child)
return
except Exception as err:
logger.exception("exit ovsdb-client monitor, err:%s", str(err))
subprocess.Popen.kill(child)
return
def run_pkt_controller_instance():
env = os.environ.copy()
if extra.has_key('log_dir'):
env['TUPLENET_LOGDIR'] = extra['log_dir']
parent_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
cmd = ['{}/pkt_controller/pkt_controller'.format(parent_dir)]
try:
child = subprocess.Popen(cmd,
stdout=subprocess.PIPE,
env=env,
preexec_fn=on_parent_exit('SIGTERM'))
logger.info("the pkt_controller is running now")
except Exception as err:
logger.warning("cannot open %s, err:%s", cmd, err)