mirror of
https://github.com/thegeeklab/prometheus-pve-sd.git
synced 2024-11-16 14:40:41 +00:00
112 lines
3.6 KiB
Python
112 lines
3.6 KiB
Python
#!/usr/bin/env python3
|
|
"""Entrypoint and CLI handler."""
|
|
|
|
import argparse
|
|
import json
|
|
import shutil
|
|
import signal
|
|
import tempfile
|
|
from time import sleep
|
|
|
|
import prometheuspvesd.exception
|
|
from prometheuspvesd import __version__
|
|
from prometheuspvesd.config import SingleConfig
|
|
from prometheuspvesd.discovery import Discovery
|
|
from prometheuspvesd.model import HostList
|
|
from prometheuspvesd.utils import SingleLog
|
|
|
|
|
|
class PrometheusSD:
|
|
"""Main Prometheus SD object."""
|
|
|
|
def __init__(self):
|
|
self.log = SingleLog()
|
|
self.logger = self.log.logger
|
|
self.args = self._cli_args()
|
|
self.config = self._get_config()
|
|
|
|
self.discovery = Discovery()
|
|
self._fetch()
|
|
|
|
def _cli_args(self):
|
|
"""
|
|
Use argparse for parsing CLI arguments.
|
|
|
|
:return: args objec
|
|
"""
|
|
parser = argparse.ArgumentParser(description="Prometheus Service Discovery for Proxmox VE")
|
|
parser.add_argument(
|
|
"-c", "--config", dest="config_file", help="location of configuration file"
|
|
)
|
|
parser.add_argument(
|
|
"-o", "--output", dest="output_file", action="store", help="output file"
|
|
)
|
|
parser.add_argument(
|
|
"-v", dest="logging.level", action="append_const", const=-1, help="increase log level"
|
|
)
|
|
parser.add_argument(
|
|
"-q", dest="logging.level", action="append_const", const=1, help="decrease log level"
|
|
)
|
|
parser.add_argument(
|
|
"--version", action="version", version="%(prog)s {}".format(__version__)
|
|
)
|
|
|
|
return parser.parse_args().__dict__
|
|
|
|
def _get_config(self):
|
|
try:
|
|
config = SingleConfig(args=self.args)
|
|
except prometheuspvesd.exception.ConfigError as e:
|
|
self.log.sysexit_with_message(e)
|
|
|
|
try:
|
|
self.log.set_level(config.config["logging"]["level"])
|
|
except ValueError as e:
|
|
self.log.sysexit_with_message("Can not set log level.\n{}".format(str(e)))
|
|
|
|
required = [("pve.server", config.config["pve"]["server"]),
|
|
("pve.user", config.config["pve"]["user"]),
|
|
("pve.password", config.config["pve"]["password"])]
|
|
for name, value in required:
|
|
if not value:
|
|
self.log.sysexit_with_message("Option '{}' is required but not set".format(name))
|
|
|
|
self.logger.info("Using config file {}".format(config.config_file))
|
|
|
|
return config
|
|
|
|
def _fetch(self):
|
|
signal.signal(signal.SIGINT, self._terminate)
|
|
signal.signal(signal.SIGTERM, self._terminate)
|
|
|
|
loop_delay = self.config.config["loop_delay"]
|
|
output_file = self.config.config["output_file"]
|
|
|
|
self.logger.info("Writes targets to {}".format(output_file))
|
|
|
|
while True:
|
|
self.logger.debug("Propagate from PVE")
|
|
self._write(self.discovery.propagate())
|
|
|
|
self.logger.info("Waiting {} seconds for next loop".format(loop_delay))
|
|
sleep(self.config.config["loop_delay"])
|
|
|
|
def _write(self, host_list: HostList):
|
|
output = []
|
|
for host in host_list.hosts:
|
|
output.append(host.to_sd_json())
|
|
|
|
# Write to tmp file and move after write
|
|
temp_file = tempfile.NamedTemporaryFile(mode="w", prefix="prometheus-pve-sd", delete=False)
|
|
with temp_file as tf:
|
|
json.dump(output, tf, indent=4)
|
|
|
|
shutil.move(temp_file.name, self.config.config["output_file"])
|
|
|
|
def _terminate(self, signal, frame):
|
|
self.log.sysexit_with_message("Terminating", code=0)
|
|
|
|
|
|
def main():
|
|
PrometheusSD()
|