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##############################################################################
# Copyright (c) 2015 Huawei Technologies Co.,Ltd. and others
#
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
##############################################################################
import logging
import multiprocessing
import subprocess
import traceback
import time
LOG = logging.getLogger(__name__)
def _execute_shell_command(command):
'''execute shell script with error handling'''
exitcode = 0
output = []
try:
output = subprocess.check_output(command, shell=True)
except Exception:
exitcode = -1
output = traceback.format_exc()
LOG.error("exec command '%s' error:\n " % command)
LOG.error(traceback.format_exc())
return exitcode, output
def _monitor_process(config, queue, event):
total_time = 0
outage_time = 0
total_count = 0
outage_count = 0
first_outage = 0
last_outage = 0
wait_time = config.get("duration", 0)
cmd = config.get("monitor_cmd", None)
if cmd is None:
LOG.error("There are no monitor cmd!")
return
queue.put("started")
begin_time = time.time()
while True:
total_count = total_count + 1
one_check_begin_time = time.time()
exit_status, stdout = _execute_shell_command(cmd)
one_check_end_time = time.time()
LOG.info("the exit_status:%s stdout:%s" % (exit_status, stdout))
if exit_status:
outage_count = outage_count + 1
outage_time = outage_time + (
one_check_end_time - one_check_begin_time)
if not first_outage:
first_outage = one_check_begin_time
last_outage = one_check_end_time
if event.is_set():
LOG.debug("the monitor process stop")
break
if wait_time > 0:
time.sleep(wait_time)
end_time = time.time()
total_time = end_time - begin_time
queue.put({"total_time": total_time,
"outage_time": last_outage-first_outage,
"total_count": total_count,
"outage_count": outage_count})
class Monitor:
def __init__(self):
self._result = []
self._monitor_process = []
def setup(self, config):
self._config = config
def start(self):
self._queue = multiprocessing.Queue()
self._event = multiprocessing.Event()
self._monitor_process = multiprocessing.Process(
target=_monitor_process, name="Monitor",
args=(self._config, self._queue, self._event))
self._monitor_process.start()
ret = self._queue.get()
if ret == "started":
LOG.debug("monitor process started!")
def stop(self):
self._event.set()
self._result = self._queue.get()
LOG.debug("stop the monitor process. the result:%s" % self._result)
def get_result(self):
return self._result
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