412 lines
15 KiB
Python
412 lines
15 KiB
Python
#!/usr/bin/env python3
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"""Pick a PIA region/server and write a WireGuard config for Gluetun."""
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from __future__ import annotations
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import json
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import os
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import random
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import re
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import socket
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import subprocess
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import sys
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import tempfile
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import time
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from concurrent.futures import ThreadPoolExecutor, as_completed
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from datetime import datetime
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from pathlib import Path
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from typing import Any
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import pia
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def log(msg: str) -> None:
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print(f"[{datetime.now().astimezone().isoformat(timespec='seconds')}] {msg}", file=sys.stderr)
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def require_env(name: str) -> str:
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value = os.environ.get(name, "")
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if not value:
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raise SystemExit(f"Missing required env var: {name}")
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return value
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def parse_list(raw: str) -> list[str]:
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raw = raw.strip()
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if not raw:
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return []
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if raw.startswith("["):
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data = json.loads(raw)
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if not isinstance(data, list):
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raise SystemExit("Expected a JSON array")
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return [str(item).strip() for item in data if str(item).strip()]
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return [part.strip() for part in raw.split(",") if part.strip()]
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def parse_regions() -> list[str]:
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regions = parse_list(require_env("PIA_REGIONS"))
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if not regions:
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raise SystemExit("PIA_REGIONS is empty after parsing")
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return regions
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def read_state(state_path: Path) -> dict[str, Any]:
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if not state_path.is_file():
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return {}
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try:
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data = json.loads(state_path.read_text(encoding="utf-8"))
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except (OSError, json.JSONDecodeError):
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return {}
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return data if isinstance(data, dict) else {}
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def tcp_latency_ms(ip: str, port: int, timeout: float) -> float | None:
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sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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sock.settimeout(timeout)
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started = time.perf_counter()
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try:
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sock.connect((ip, port))
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return (time.perf_counter() - started) * 1000.0
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except OSError:
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return None
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finally:
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sock.close()
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def average_tcp_latency_ms(ip: str, port: int, timeout: float, samples: int) -> float | None:
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readings: list[float] = []
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for _ in range(samples):
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value = tcp_latency_ms(ip, port, timeout)
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if value is None:
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return None
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readings.append(value)
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return sum(readings) / len(readings)
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def pick_fastest(
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candidates: list[str],
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previous_region: str | None,
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previous_server_ip: str | None,
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) -> tuple[pia.WgServer, list[dict[str, Any]]]:
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port = int(os.environ.get("LATENCY_PORT", "1337"))
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timeout = float(os.environ.get("LATENCY_TIMEOUT_SECONDS", "2"))
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samples = max(1, int(os.environ.get("LATENCY_SAMPLES", "2")))
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margin = float(os.environ.get("LATENCY_SWITCH_MARGIN_MS", "15"))
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serverlist = pia.fetch_serverlist()
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servers: list[pia.WgServer] = []
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for region_id in candidates:
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servers.extend(pia.region_wg_servers(serverlist, region_id))
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if not servers:
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raise SystemExit("No reachable WireGuard servers found for configured regions")
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best_by_region: dict[str, dict[str, Any]] = {}
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with ThreadPoolExecutor(max_workers=min(32, len(servers))) as pool:
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futures = {
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pool.submit(average_tcp_latency_ms, server.ip, port, timeout, samples): server
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for server in servers
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}
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for future in as_completed(futures):
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server = futures[future]
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value = future.result()
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current = best_by_region.setdefault(
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server.region,
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{
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"region": server.region,
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"latency_ms": None,
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"server_ip": None,
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"server_cn": None,
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"servers": 0,
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"failures": 0,
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},
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)
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current["servers"] += 1
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if value is None:
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current["failures"] += 1
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continue
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if current["latency_ms"] is None or value < current["latency_ms"]:
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current["latency_ms"] = round(value, 2)
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current["server_ip"] = server.ip
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current["server_cn"] = server.cn
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results = sorted(
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best_by_region.values(),
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key=lambda item: (
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item["latency_ms"] is None,
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item["latency_ms"] if item["latency_ms"] is not None else float("inf"),
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item["region"],
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),
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)
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for item in results:
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latency = "timeout" if item["latency_ms"] is None else f"{item['latency_ms']:.2f}ms"
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log(
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f"Latency {item['region']}: {latency} "
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f"(best={item['server_cn']}/{item['server_ip']}, "
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f"servers={item['servers']}, failures={item['failures']})"
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)
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reachable = [item for item in results if item["latency_ms"] is not None]
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if not reachable:
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raise SystemExit("All latency probes failed; cannot select fastest region")
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winner = reachable[0]
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if previous_region:
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previous_result = next((item for item in reachable if item["region"] == previous_region), None)
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if previous_result is not None:
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improvement = previous_result["latency_ms"] - winner["latency_ms"]
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same_server = (
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previous_server_ip
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and previous_result["server_ip"] == previous_server_ip
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)
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if winner["region"] != previous_region and improvement < margin:
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log(
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f"Keeping current region {previous_region} "
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f"({previous_result['latency_ms']:.2f}ms); "
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f"best {winner['region']} only {improvement:.2f}ms faster "
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f"(margin {margin:g}ms)"
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)
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winner = previous_result
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elif winner["region"] == previous_region and same_server:
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log(f"Current endpoint {previous_server_ip} is still fastest in {previous_region}")
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elif winner["region"] == previous_region:
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log(f"Current region {previous_region} is still fastest")
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server = pia.WgServer(
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region=winner["region"],
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ip=winner["server_ip"],
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cn=winner["server_cn"],
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)
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log(f"Selected {server.region} via {server.cn} ({server.ip}) at {winner['latency_ms']:.2f}ms")
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return server, results
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def pick_random(candidates: list[str], previous_region: str | None) -> pia.WgServer:
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serverlist = pia.fetch_serverlist()
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pool = [region for region in candidates if region != previous_region] or list(candidates)
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if previous_region and previous_region not in pool and len(candidates) == 1:
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log(f"Only one region configured; reusing previous: {previous_region}")
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elif previous_region and previous_region not in pool:
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log(f"Excluding previous region: {previous_region}")
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random.shuffle(pool)
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for region_id in pool:
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servers = pia.region_wg_servers(serverlist, region_id)
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if servers:
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server = random.choice(servers)
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log(f"Randomly selected {server.region} via {server.cn} ({server.ip})")
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return server
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raise SystemExit("No WireGuard servers found for configured regions")
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def pick_server(state_path: Path) -> tuple[pia.WgServer, str, list[dict[str, Any]]]:
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regions = parse_regions()
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state = read_state(state_path)
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previous_region = state.get("region") if isinstance(state.get("region"), str) else None
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previous_server_ip = state.get("server_ip") if isinstance(state.get("server_ip"), str) else None
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mode = os.environ.get("REGION_SELECT", "fastest").strip().lower() or "fastest"
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if mode == "random":
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return pick_random(regions, previous_region), mode, []
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if mode != "fastest":
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raise SystemExit(f"Invalid REGION_SELECT '{mode}' (expected fastest|random)")
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server, results = pick_fastest(regions, previous_region, previous_server_ip)
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return server, mode, results
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def parse_restart_containers() -> list[str]:
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gluetun = os.environ.get("GLUETUN_CONTAINER", "m3u-filter-vpn").strip() or "m3u-filter-vpn"
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ordered = [gluetun]
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seen = {gluetun}
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for container in parse_list(os.environ.get("RESTART_CONTAINERS", "")):
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if container in seen:
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continue
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ordered.append(container)
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seen.add(container)
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return ordered
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def restart_containers(containers: list[str]) -> None:
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if not containers:
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raise SystemExit("No containers configured to restart")
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for container in containers:
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log(f"Restarting container: {container}")
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result = subprocess.run(["docker", "restart", container], check=False)
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if result.returncode != 0:
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raise SystemExit(f"docker restart failed for container={container}")
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def config_age_seconds(wg_path: Path) -> float | None:
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if not wg_path.is_file():
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return None
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try:
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return time.time() - wg_path.stat().st_mtime
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except OSError:
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return None
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def should_skip_regeneration(
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server: pia.WgServer,
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state: dict[str, Any],
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wg_path: Path,
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latency_results: list[dict[str, Any]],
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) -> bool:
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if pia.env_bool("FORCE_ROTATE", False):
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log("FORCE_ROTATE=true; regenerating WireGuard config")
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return False
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previous_region = state.get("region")
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previous_server_ip = state.get("server_ip")
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if previous_region != server.region:
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return False
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age = config_age_seconds(wg_path)
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if age is None:
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return False
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max_age = pia.parse_duration_seconds(os.environ.get("WG_CONFIG_MAX_AGE", "7d"), 604800)
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if age > max_age:
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log(f"Existing WireGuard config is stale (age {int(age)}s > max {max_age}s); regenerating")
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return False
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if not re.search(
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r"^\[Interface\]",
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wg_path.read_text(encoding="utf-8", errors="replace"),
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flags=re.MULTILINE,
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):
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return False
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# Same region, different server: only regenerate if clearly faster.
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if previous_server_ip and server.ip != previous_server_ip:
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margin = float(os.environ.get("LATENCY_SWITCH_MARGIN_MS", "15"))
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previous_latency = state.get("latency_ms")
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winner = next((item for item in latency_results if item.get("server_ip") == server.ip), None)
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new_latency = winner.get("latency_ms") if winner else None
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if (
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isinstance(previous_latency, (int, float))
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and isinstance(new_latency, (int, float))
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and (previous_latency - new_latency) < margin
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):
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log(
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f"Keeping current server {previous_server_ip}; "
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f"{server.ip} only {previous_latency - new_latency:.2f}ms faster "
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f"(margin {margin:g}ms)"
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)
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return True
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log(f"Switching server within {server.region}: {previous_server_ip} -> {server.ip}")
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return False
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log(
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f"Skipping PIA token/addKey; endpoint unchanged "
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f"({server.region}/{server.ip}) and config age {int(age)}s <= {max_age}s"
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)
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return True
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def write_state(
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state_path: Path,
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server: pia.WgServer,
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mode: str,
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restarted: list[str],
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latency_results: list[dict[str, Any]],
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*,
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skipped: bool = False,
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) -> None:
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previous = read_state(state_path)
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winner = next(
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(
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item
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for item in latency_results
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if item.get("region") == server.region and item.get("server_ip") == server.ip
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),
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next((item for item in latency_results if item.get("region") == server.region), None),
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)
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now = datetime.now().astimezone().isoformat(timespec="seconds")
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payload: dict[str, Any] = {
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"region": server.region,
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"server_ip": server.ip,
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"server_cn": server.cn,
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"selection": mode,
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"wg_config": os.environ.get("WG_CONFIG_PATH", "/config/wireguard/wg0.conf"),
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"restarted_containers": restarted,
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"last_checked_at": now,
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"skipped_regeneration": skipped,
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}
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if skipped and isinstance(previous.get("rotated_at"), str):
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payload["rotated_at"] = previous["rotated_at"]
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else:
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payload["rotated_at"] = now
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if winner and winner.get("latency_ms") is not None:
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payload["latency_ms"] = winner["latency_ms"]
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elif skipped and previous.get("latency_ms") is not None:
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payload["latency_ms"] = previous["latency_ms"]
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if latency_results:
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payload["latency_results"] = latency_results
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state_path.parent.mkdir(parents=True, exist_ok=True)
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state_path.write_text(json.dumps(payload, indent=2) + "\n", encoding="utf-8")
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state_path.chmod(0o644)
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def rotate_once() -> None:
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require_env("PIA_USER")
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require_env("PIA_PASS")
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require_env("PIA_REGIONS")
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state_path = Path(os.environ.get("ROTATOR_STATE_PATH", "/config/rotator-state.json"))
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wg_path = Path(os.environ.get("WG_CONFIG_PATH", "/config/wireguard/wg0.conf"))
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state = read_state(state_path)
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server, mode, latency_results = pick_server(state_path)
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log(f"Selected endpoint: {server.region} / {server.cn} / {server.ip} (mode={mode})")
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if should_skip_regeneration(server, state, wg_path, latency_results):
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# If we decided to keep the previous server IP, persist that identity.
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keep_ip = state.get("server_ip") if isinstance(state.get("server_ip"), str) else server.ip
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keep_cn = state.get("server_cn") if isinstance(state.get("server_cn"), str) else server.cn
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if keep_ip != server.ip:
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server = pia.WgServer(region=server.region, ip=keep_ip, cn=str(keep_cn or server.cn))
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write_state(state_path, server, mode, [], latency_results, skipped=True)
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log(f"Rotation skipped for {server.region}/{server.ip}")
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return
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with tempfile.TemporaryDirectory(prefix="pia-rotate-") as tmp:
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tmp_conf = Path(tmp) / "wg0.conf"
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log("Generating WireGuard config via native PIA client")
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pia.generate_wg_config(
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require_env("PIA_USER"),
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require_env("PIA_PASS"),
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server,
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tmp_conf,
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)
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text = tmp_conf.read_text(encoding="utf-8", errors="replace")
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if not re.search(r"^\[Interface\]", text, flags=re.MULTILINE):
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raise SystemExit("Generated config missing [Interface] section")
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wg_path.parent.mkdir(parents=True, exist_ok=True)
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os.replace(tmp_conf, wg_path)
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wg_path.chmod(0o600)
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log(f"Wrote {wg_path}")
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restarted = parse_restart_containers()
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restart_containers(restarted)
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write_state(state_path, server, mode, restarted, latency_results, skipped=False)
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log(f"Rotation complete for {server.region}/{server.ip}")
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def list_regions_main() -> None:
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for region in pia.list_regions():
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print(
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f"{region['id']:<35} {region['name']:<35} "
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f"country={region['country']:<4} port-forward={region['port_forward']!s:<5} "
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f"offline={region['offline']} wg={region['wg_servers']}"
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)
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if __name__ == "__main__":
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if len(sys.argv) > 1 and sys.argv[1] in {"--list-regions", "list-regions"}:
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list_regions_main()
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else:
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rotate_once()
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