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#!/router/bin/python
import os
import outer_packages
import zmq
import threading
import logging
import CCustomLogger
from json import JSONDecoder
from common.trex_status_e import TRexStatus
# setup the logger
CCustomLogger.setup_custom_logger('TRexServer')
logger = logging.getLogger('TRexServer')
class ZmqMonitorSession(threading.Thread):
def __init__(self, trexObj , zmq_port):
super(ZmqMonitorSession, self).__init__()
self.stoprequest = threading.Event()
# self.terminateFlag = False
self.first_dump = True
self.zmq_port = zmq_port
self.zmq_publisher = "tcp://localhost:{port}".format( port = self.zmq_port )
# self.context = zmq.Context()
# self.socket = self.context.socket(zmq.SUB)
self.trexObj = trexObj
self.expect_trex = self.trexObj.expect_trex # used to signal if T-Rex is expected to run and if data should be considered
self.decoder = JSONDecoder()
logger.info("ZMQ monitor initialization finished")
def run (self):
self.context = zmq.Context()
self.socket = self.context.socket(zmq.SUB)
logger.info("ZMQ monitor started listening @ {pub}".format( pub = self.zmq_publisher ) )
self.socket.connect(self.zmq_publisher)
self.socket.setsockopt(zmq.SUBSCRIBE, '')
while not self.stoprequest.is_set():
try:
zmq_dump = self.socket.recv() # This call is BLOCKING until data received!
if self.expect_trex.is_set():
self.parse_and_update_zmq_dump(zmq_dump)
logger.debug("ZMQ dump received on socket, and saved to trexObject.")
except Exception as e:
if self.stoprequest.is_set():
# allow this exception since it comes from ZMQ monitor termination
pass
else:
logger.error("ZMQ monitor thrown an exception. Received exception: {ex}".format(ex = e))
raise
def join (self, timeout = None):
self.stoprequest.set()
logger.debug("Handling termination of ZMQ monitor thread")
self.socket.close()
self.context.term()
logger.info("ZMQ monitor resources has been freed.")
super(ZmqMonitorSession, self).join(timeout)
def parse_and_update_zmq_dump (self, zmq_dump):
try:
dict_obj = self.decoder.decode(zmq_dump)
except ValueError:
logger.error("ZMQ dump failed JSON-RPC decode. Ignoring. Bad dump was: {dump}".format(dump = zmq_dump))
dict_obj = None
# add to trex_obj zmq latest dump, based on its 'name' header
if dict_obj is not None and dict_obj!={}:
self.trexObj.zmq_dump[dict_obj['name']] = dict_obj
if self.first_dump:
# change TRexStatus from starting to Running once the first ZMQ dump is obtained and parsed successfully
self.first_dump = False
self.trexObj.set_status(TRexStatus.Running)
self.trexObj.set_verbose_status("T-Rex is Running")
logger.info("First ZMQ dump received and successfully parsed. TRex running state changed to 'Running'.")
if __name__ == "__main__":
pass
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