75 lines
2.5 KiB
Python
75 lines
2.5 KiB
Python
"""RIR provider — orchestrates fetch + parse into a :class:`Lookup`."""
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from __future__ import annotations
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import logging
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from pathlib import Path
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from typing import Sequence
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from decnet.geoip.base import Provider
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from decnet.geoip.lookup import Lookup
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from decnet.geoip.paths import ensure_root
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from decnet.geoip.rir.fetch import RIR_SOURCES, fetch_all
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from decnet.geoip.rir.parse import parse_file
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logger = logging.getLogger("decnet.geoip.rir.provider")
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# Pickled lookup cache — skips re-parsing ~5 MB of RIR text on every
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# profiler restart. Rebuilt whenever any raw file is newer than the
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# cache, see ``_cache_fresh``.
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_CACHE_NAME = ".rir_index.pkl"
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class RirProvider(Provider):
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name = "rir"
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def __init__(self) -> None:
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self._root = ensure_root()
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# ---------- Provider interface ----------
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def refresh(self) -> None:
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logger.info("geoip.rir: refreshing delegated-stats files into %s", self._root)
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fetch_all(self._root)
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# Invalidate the cache — next build_lookup regenerates it.
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cache = self._root / _CACHE_NAME
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if cache.exists():
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cache.unlink(missing_ok=True)
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def build_lookup(self) -> Lookup:
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cache = self._root / _CACHE_NAME
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if self._cache_fresh(cache):
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try:
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lookup = Lookup.load(cache)
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logger.debug("geoip.rir: loaded cached index (%d ranges)", len(lookup))
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return lookup
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except Exception as exc:
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logger.warning("geoip.rir: cache load failed, rebuilding: %s", exc)
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ranges = []
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for path in self.data_paths():
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if not path.exists():
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continue
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ranges.extend(parse_file(path))
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lookup = Lookup.from_ranges(ranges)
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try:
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lookup.save(cache)
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except Exception as exc:
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logger.warning("geoip.rir: cache save failed: %s", exc)
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logger.info("geoip.rir: built index with %d ranges", len(lookup))
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return lookup
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def data_paths(self) -> Sequence[Path]:
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return [self._root / f"{name}.txt" for name, _url in RIR_SOURCES]
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# ---------- internals ----------
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def _cache_fresh(self, cache: Path) -> bool:
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"""True when the pickle exists and is at least as new as every raw file."""
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if not cache.exists():
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return False
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cache_mtime = cache.stat().st_mtime
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for path in self.data_paths():
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if path.exists() and path.stat().st_mtime > cache_mtime:
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return False
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return True
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