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