pvc/health-daemon/pvchealthd/Daemon.py

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#!/usr/bin/env python3
# Daemon.py - Health daemon main entrypoing
# Part of the Parallel Virtual Cluster (PVC) system
#
# Copyright (C) 2018-2022 Joshua M. Boniface <joshua@boniface.me>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
#
###############################################################################
import pvchealthd.util.zookeeper
import pvchealthd.objects.MonitoringInstance as MonitoringInstance
import pvchealthd.objects.NodeInstance as NodeInstance
import daemon_lib.config as cfg
import daemon_lib.log as log
from time import sleep
import os
import signal
# Daemon version
version = "0.9.82"
##########################################################
# Entrypoint
##########################################################
def entrypoint():
monitoring_instance = None
# Get our configuration
config = cfg.get_configuration()
config["daemon_name"] = "pvchealthd"
config["daemon_version"] = version
# Set up the logger instance
logger = log.Logger(config)
# Print our startup message
logger.out("")
logger.out("|--------------------------------------------------------------|")
logger.out("| |")
logger.out("| ███████████ ▜█▙ ▟█▛ █████ █ █ █ |")
logger.out("| ██ ▜█▙ ▟█▛ ██ |")
logger.out("| ███████████ ▜█▙ ▟█▛ ██ |")
logger.out("| ██ ▜█▙▟█▛ ███████████ |")
logger.out("| |")
logger.out("|--------------------------------------------------------------|")
logger.out("| Parallel Virtual Cluster health daemon v{0: <20} |".format(version))
logger.out("| Debug: {0: <53} |".format(str(config["debug"])))
logger.out("| FQDN: {0: <54} |".format(config["node_fqdn"]))
logger.out("| Host: {0: <54} |".format(config["node_hostname"]))
logger.out("| ID: {0: <56} |".format(config["node_id"]))
logger.out("| IPMI hostname: {0: <45} |".format(config["ipmi_hostname"]))
logger.out("| Machine details: |")
logger.out("| CPUs: {0: <52} |".format(config["static_data"][0]))
logger.out("| Arch: {0: <52} |".format(config["static_data"][3]))
logger.out("| OS: {0: <54} |".format(config["static_data"][2]))
logger.out("| Kernel: {0: <50} |".format(config["static_data"][1]))
logger.out("|--------------------------------------------------------------|")
logger.out("")
logger.out(f'Starting pvchealthd on host {config["node_fqdn"]}', state="s")
# Connect to Zookeeper and return our handler and current schema version
zkhandler, _ = pvchealthd.util.zookeeper.connect(logger, config)
# Define a cleanup function
def cleanup(failure=False):
nonlocal logger, zkhandler, monitoring_instance
logger.out("Terminating pvchealthd and cleaning up", state="s")
# Shut down the monitoring system
try:
logger.out("Shutting down monitoring subsystem", state="s")
monitoring_instance.shutdown()
except Exception:
pass
# Close the Zookeeper connection
try:
zkhandler.disconnect(persistent=True)
del zkhandler
except Exception:
pass
logger.out("Terminated health daemon", state="s")
logger.terminate()
if failure:
retcode = 1
else:
retcode = 0
os._exit(retcode)
# Termination function
def term(signum="", frame=""):
cleanup(failure=False)
# Hangup (logrotate) function
def hup(signum="", frame=""):
if config["file_logging"]:
logger.hup()
# Handle signals gracefully
signal.signal(signal.SIGTERM, term)
signal.signal(signal.SIGINT, term)
signal.signal(signal.SIGQUIT, term)
signal.signal(signal.SIGHUP, hup)
this_node = NodeInstance.NodeInstance(
config["node_hostname"],
zkhandler,
config,
logger,
)
# Set up the node monitoring instance and thread
monitoring_instance = MonitoringInstance.MonitoringInstance(
zkhandler, config, logger, this_node
)
# Tick loop; does nothing since everything is async
while True:
try:
sleep(1)
except Exception:
break