prometheus-pve-sd/prometheuspvesd/cli.py

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#!/usr/bin/env python3
"""Entrypoint and CLI handler."""
import argparse
import json
import shutil
import signal
import tempfile
from os import chmod
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from time import sleep
from prometheus_client import start_http_server
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import prometheuspvesd.exception
from prometheuspvesd import __version__
from prometheuspvesd.config import SingleConfig
from prometheuspvesd.discovery import Discovery
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from prometheuspvesd.exception import APIError
from prometheuspvesd.logger import SingleLog
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from prometheuspvesd.model import HostList
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()
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signal.signal(signal.SIGINT, self._terminate)
signal.signal(signal.SIGTERM, self._terminate)
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while True:
try:
self.discovery = Discovery()
except APIError as e:
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if not self.config.config["service"]:
self.log.sysexit_with_message(f"Proxmoxer API error: {str(e).strip()}")
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self.logger.error(f"Proxmoxer API error: {str(e).strip()}")
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sleep(60)
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continue
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else:
break
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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",
action="store",
help="location of configuration file"
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)
parser.add_argument(
"-o", "--output", dest="output_file", action="store", help="output file"
)
parser.add_argument(
"-m", "--mode", dest="output_file_mode", action="store", help="output file mode"
)
parser.add_argument(
"-d",
"--loop-delay",
dest="loop_delay",
action="store",
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type=int,
help="delay between discovery runs"
)
parser.add_argument(
"--no-service",
dest="service",
action="store_false",
default=None,
help="run discovery only once"
)
parser.add_argument(
"-f",
"--log-format",
dest="logging.format",
metavar="LOG_FORMAT",
action="store",
help="used log format"
)
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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=f"%(prog)s {__version__}")
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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.update_logger(
config.config["logging"]["level"], config.config["logging"]["format"]
)
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except ValueError as e:
self.log.sysexit_with_message(f"Can not set log level.\n{str(e)}")
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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(f"Option '{name}' is required but not set")
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self.logger.info(f"Using config file {config.config_file}")
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return config
def _fetch(self):
self.logger.info("Writes targets to {}".format(self.config.config["output_file"]))
self.logger.debug("Propagate from PVE")
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if self.config.config["service"] and self.config.config["metrics"]["enabled"]:
self.logger.info(
"Starting metrics http endpoint on port {}".format(
self.config.config["metrics"]["port"]
)
)
start_http_server(
self.config.config["metrics"]["port"],
addr=self.config.config["metrics"]["address"]
)
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while True:
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try:
inventory = self.discovery.propagate()
except APIError as e:
self.logger.error(f"Proxmoxer API error: {str(e).strip()}")
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except Exception as e: # noqa
self.logger.error(f"Unknown error: {str(e).strip()}")
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else:
self._write(inventory)
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if not self.config.config["service"]:
break
self.logger.info(
"Waiting {} seconds for next discovery loop".format(
self.config.config["loop_delay"]
)
)
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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"])
chmod(self.config.config["output_file"], int(self.config.config["output_file_mode"], 8))
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def _terminate(self, signal, frame): # noqa
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self.log.sysexit_with_message("Terminating", code=0)
def main():
PrometheusSD()