236 lines
7.4 KiB
Python
236 lines
7.4 KiB
Python
"""Simple Redfish exporter to collect Power data from bare matel server"""
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import argparse
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import signal
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import time
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import logging
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from dataclasses import dataclass, field
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import asyncio
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import aiohttp
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import urllib3
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import yaml
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from prometheus_client import Gauge, start_http_server, Summary, Counter, Histogram
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@dataclass
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class HostConfig:
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"""Solve too many arguments"""
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fqdn: str
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username: str
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password: str
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max_retries: int = 1
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backoff: int = 2
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cool_down: int = 120 # seconds to wait after too many failures
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failures: int = 0
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next_retry_time: float = field(default=0.0, init=False)
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def should_skip(self) -> bool:
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"""Check if host is still in cool-down window"""
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return time.monotonic() < self.next_retry_time
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def mark_failure(self):
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"""Increase failure counter and maybe trigger cool-down"""
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self.failures += 1
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if self.failures >= self.max_retries:
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self.next_retry_time = time.monotonic() + self.cool_down
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self.failures = 0 # reset after triggering cool-down
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def mark_success(self):
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"""Reset failure counter after a successful request"""
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self.failures = 0
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self.next_retry_time = 0.0
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# Disable certificate warnings
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urllib3.disable_warnings()
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# set log config
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logging.basicConfig(
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level=logging.INFO, format="%(asctime)s [%(levelname)s] %(message)s"
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)
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# Prometheus metrics
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REQUEST_TIME = Summary("request_processing_seconds", "Time spent processing request")
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REQUEST_LATENCY = Histogram(
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"redfish_request_latency_seconds", "Time for Redfish request", ["host"]
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)
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up_gauge = Gauge("redfish_up", "Host up/down", ["host"])
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error_counter = Counter(
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"redfish_errors_total", "Total Redfish errors", ["host", "error"]
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)
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voltage_gauge = Gauge(
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"redfish_psu_line_input_voltage_volts",
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"Line Input Voltage per PSU",
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["host", "psu_serial"],
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)
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watts_gauge = Gauge(
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"redfish_psu_power_input_watts", "Power Input Watts per PSU", ["host", "psu_serial"]
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)
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amps_gauge = Gauge(
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"redfish_psu_input_amps", "Current draw in Amps per PSU", ["host", "psu_serial"]
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)
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@REQUEST_TIME.time()
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async def process_request(t):
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"""Simulate request time"""
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await asyncio.sleep(t)
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async def fetch_with_retry(session, host: HostConfig, url: str) -> dict | None:
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"""Fetch JSON from Redfish with retry/backoff"""
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if host.should_skip():
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logging.warning(
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"Skipping %s (in cool-down until %.1f)", host.fqdn, host.next_retry_time
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)
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up_gauge.labels(host=host.fqdn).set(0)
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return None
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for attempt in range(1, host.max_retries + 1):
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try:
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async with session.get(
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url,
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auth=aiohttp.BasicAuth(host.username, host.password),
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ssl=False,
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timeout=10,
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) as resp:
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if resp.status == 200:
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host.mark_success()
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return await resp.json()
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logging.warning(
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"HTTP %s from %s (attempt %d)", resp.status, host.fqdn, attempt
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)
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except asyncio.TimeoutError:
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logging.warning("Timeout on %s (attempt %d)", host.fqdn, attempt)
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except aiohttp.ClientError as e:
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logging.warning(
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"Client error on %s (attempt %d): %s", host.fqdn, attempt, e
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)
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except Exception as e:
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logging.exception(
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"Unexpected error on %s (attempt %d): %s", host.fqdn, attempt, e
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)
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if attempt < host.max_retries:
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await asyncio.sleep(host.backoff * attempt)
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else:
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host.mark_failure()
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logging.error("All retries failed for %s", host.fqdn)
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return None
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async def get_power_data(session, host: HostConfig):
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"""Query Redfish and update Prometheus metrics"""
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if host.should_skip():
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logging.warning(
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"Skipping %s (in cool-down until %.1f)", host.fqdn, host.next_retry_time
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)
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up_gauge.labels(host=host.fqdn).set(0)
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return
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url = f"https://{host.fqdn}/redfish/v1/Chassis/1/Power"
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start = time.monotonic()
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data = await fetch_with_retry(session, host, url)
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if not data:
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host.mark_failure()
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up_gauge.labels(host=host.fqdn).set(0)
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return
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host.mark_success()
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up_gauge.labels(host=host.fqdn).set(1)
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for psu in data.get("PowerSupplies", []):
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line_input_v = psu.get("LineInputVoltage")
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watts_input = psu.get("PowerInputWatts")
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serial = psu.get("SerialNumber")
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amps = (
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round(watts_input / line_input_v, 2)
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if line_input_v and watts_input
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else None
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)
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if line_input_v is not None:
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voltage_gauge.labels(host=host.fqdn, psu_serial=serial).set(line_input_v)
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if watts_input is not None:
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watts_gauge.labels(host=host.fqdn, psu_serial=serial).set(watts_input)
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if amps is not None:
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amps_gauge.labels(host=host.fqdn, psu_serial=serial).set(amps)
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REQUEST_LATENCY.labels(host=host.fqdn).observe(time.monotonic() - start)
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async def run_exporter(config, stop_event):
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"""Main loop"""
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port = config.get("port", 8000)
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default_username = config.get("username")
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default_password = config.get("password")
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hosts = config["hosts"]
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interval = config.get("interval", 10)
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# Start Prometheus metrics server
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start_http_server(port)
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logging.info("Prometheus metrics server running on port %s", port)
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# create persistent HostConfig objects
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host_objs = []
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for host_entry in hosts:
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if isinstance(host_entry, dict):
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hc = HostConfig(
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fqdn=host_entry["fqdn"],
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username=host_entry.get("username", default_username),
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password=host_entry.get("password", default_password),
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)
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else:
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hc = HostConfig(
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fqdn=host_entry, username=default_username, password=default_password
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)
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host_objs.append(hc)
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# Connection pooling with aiohttp
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connector = aiohttp.TCPConnector(limit_per_host=5, limit=50, ttl_dns_cache=300)
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async with aiohttp.ClientSession(connector=connector) as session:
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while not stop_event.is_set():
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tasks = [get_power_data(session, hc) for hc in host_objs]
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await asyncio.gather(*tasks)
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await process_request(interval)
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logging.info("Exporter stopped cleanly.")
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async def main():
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"""Modern asyncio entry point"""
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parser = argparse.ArgumentParser(description="Redfish Prometheus Exporter")
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parser.add_argument("--config", default="config.yaml", help="Path to config file")
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parser.add_argument("--port", type=int, help="Override port from config file")
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parser.add_argument(
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"--interval", type=int, help="Override interval from config file"
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)
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args = parser.parse_args()
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# Load YAML config
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with open(args.config, "r", encoding="utf-8") as file:
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config = yaml.safe_load(file)
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# Override port if argument is provided
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if args.port is not None:
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config["port"] = args.port
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if args.interval is not None:
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config["interval"] = args.interval
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stop_event = asyncio.Event()
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loop = asyncio.get_running_loop()
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# Handle SIGINT (Ctrl+C) and SIGTERM
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for sig in (signal.SIGINT, signal.SIGTERM):
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loop.add_signal_handler(sig, stop_event.set)
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await run_exporter(config, stop_event)
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if __name__ == "__main__":
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asyncio.run(main())
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