80 lines
2.8 KiB
Python
80 lines
2.8 KiB
Python
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"""Автоматическая резервная копия PostgreSQL не реже раза в сутки.
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Процесс живёт отдельным Compose-сервисом. Он делает копию сразу, если свежей
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нет, затем ориентируется на фактическое время последнего успешного файла.
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После ошибки повторяет попытку чаще, но не удаляет существующие копии.
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"""
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from __future__ import annotations
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import logging
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import sys
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import time
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from datetime import datetime, timezone
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from pathlib import Path
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ROOT = Path(__file__).resolve().parents[1]
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sys.path.insert(0, str(ROOT))
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from app.admin.backup import BackupError, DIR, create, listing # noqa: E402
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from app.config import get_settings # noqa: E402
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logging.basicConfig(
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level=logging.INFO,
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format="%(asctime)s %(levelname)s backup-scheduler %(message)s",
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)
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log = logging.getLogger("backup-scheduler")
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def seconds_until_due(now: datetime, interval: int) -> float:
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copies = listing()
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if not copies:
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return 0.0
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age = (now - copies[0]["at"]).total_seconds()
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return max(0.0, interval - age)
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def prune(keep: int) -> int:
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old = listing()[keep:]
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deleted = 0
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for item in old:
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try:
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(DIR / item["name"]).unlink(missing_ok=True)
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deleted += 1
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except OSError as exc:
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# A locked/readonly old file must not take down the daily scheduler.
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log.error("не удалось удалить старую копию %s: %s", item["name"], exc)
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return deleted
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def run_forever() -> None:
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settings = get_settings()
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interval = max(60, settings.backup_interval_seconds)
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retry = max(10, min(settings.backup_retry_seconds, interval))
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keep = max(1, settings.backup_keep)
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log.info("запущен: интервал=%s с, хранить=%s", interval, keep)
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while True:
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try:
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wait = seconds_until_due(datetime.now(timezone.utc), interval)
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except BackupError as exc:
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log.error("не удалось проверить резервные копии: %s; повтор через %s с", exc, retry)
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time.sleep(retry)
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continue
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if wait > 0:
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time.sleep(wait)
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continue
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try:
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made = create()
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deleted = prune(keep)
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log.info("готово: %s (%s байт), удалено старых=%s",
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made["name"], made["size_bytes"], deleted)
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except BackupError as exc:
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log.error("цикл резервного копирования не завершён: %s; повтор через %s с", exc, retry)
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time.sleep(retry)
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continue
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time.sleep(interval)
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if __name__ == "__main__":
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run_forever()
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