2026-08-11 17:18:15 +02:00
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#!/usr/bin/env python3
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"""Generate system-monitor PNG graphs from its RRD database."""
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from __future__ import annotations
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import argparse
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import configparser
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import html
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from pathlib import Path
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import subprocess
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PERIODS = {"3hours": "3h", "1day": "1d", "2weeks": "2w", "1year": "1y"}
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COLORS = ["#2563EB", "#DC2626", "#16A34A", "#9333EA"]
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def graph(output: Path, rrd: Path, start: str, title: str, unit: str,
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series: list[tuple[str, str, str]], logarithmic: bool = False) -> None:
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args = ["rrdtool", "graph", str(output), "--start", f"end-{start}",
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"--end", "now", "--width", "900", "--height", "260",
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"--title", title, "--vertical-label", unit, "--slope-mode",
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"--watermark", "cheap-system-monitor"]
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if logarithmic:
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args += ["--logarithmic", "--lower-limit", "1"]
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for index, (ds, label, cf) in enumerate(series):
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var = f"v{index}"
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args += [f"DEF:{var}={rrd}:{ds}:{cf}",
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f"LINE{2 if index < 3 else 1}:{var}{COLORS[index % len(COLORS)]}:{label}",
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f"GPRINT:{var}:LAST:Current\\:%8.2lf%s",
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f"GPRINT:{var}:AVERAGE:Average\\:%8.2lf%s",
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f"GPRINT:{var}:MAX:Maximum\\:%8.2lf%s\\n"]
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subprocess.run(args, check=True)
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def main() -> None:
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parser = argparse.ArgumentParser(description=__doc__)
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2026-08-11 18:52:41 +02:00
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parser.add_argument("--config", default="/opt/cheap_system_monitor/monitor.conf")
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2026-08-11 17:18:15 +02:00
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args = parser.parse_args()
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config_parser = configparser.ConfigParser()
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if not config_parser.read(args.config):
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raise SystemExit(f"Configuration file not found: {args.config}")
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config = config_parser["monitor"]
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rrd = Path(config["rrd_file"])
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if not rrd.exists():
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raise SystemExit(f"RRD file does not exist: {rrd}")
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output_dir = Path(config.get("graph_dir", "/var/www/html/system-monitor"))
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output_dir.mkdir(parents=True, exist_ok=True)
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mounts = [item.strip() for item in config["mountpoints"].split(",") if item.strip()]
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if not mounts or mounts[0] != "/":
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mounts.insert(0, "/")
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definitions = [
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("load", "Processor load", "load", [("load1", "1 minute", "AVERAGE"), ("load5", "5 minutes", "AVERAGE"), ("load15", "15 minutes", "AVERAGE")], False),
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("cpu", "CPU usage", "%", [("cpu_user", "user", "AVERAGE"), ("cpu_system", "system", "AVERAGE"), ("cpu_nice", "nice", "AVERAGE")], False),
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("network", "Network throughput", "bytes/s", [("net_in", "received", "AVERAGE"), ("net_out", "sent", "AVERAGE")], False),
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("disk", "Disk usage", "%", [(f"disk_{'root' if i == 0 else i}", mount, "AVERAGE") for i, mount in enumerate(mounts)], False),
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("memory", "Memory usage", "%", [("memory", "used", "AVERAGE")], False),
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]
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for period_name, start in PERIODS.items():
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for filename, title, unit, series, logarithmic in definitions:
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graph(output_dir / f"{filename}-{period_name}.png", rrd, start,
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f"{title} — {period_name}", unit, series, logarithmic)
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cards = "\n".join(
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f'<section><h2>{html.escape(title)}</h2>' + "".join(
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f'<figure><figcaption>{period}</figcaption>'
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f'<img src="{filename}-{period}.png" alt="{html.escape(title)}, {period}"></figure>'
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for period in PERIODS
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) + "</section>"
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for filename, title, _unit, _series, _logarithmic in definitions
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)
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page = f"""<!doctype html>
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<html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width">
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<meta http-equiv="refresh" content="300"><title>System monitor</title>
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<style>body{{font:16px system-ui;margin:auto;max-width:1100px;padding:1rem;background:#f8fafc;color:#172033}}
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section{{background:white;padding:1rem;margin:1rem 0;border-radius:.5rem;box-shadow:0 1px 4px #0002}}
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figure{{margin:1rem 0}} img{{width:100%;height:auto}} figcaption{{font-weight:600}}</style>
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</head><body><h1>System monitor</h1>{cards}</body></html>"""
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(output_dir / "index.html").write_text(page)
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if __name__ == "__main__":
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main()
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