peter
b1832afd18
Mechanical, whole-tree `ruff format` pass — no behaviour change. Recorded in .git-blame-ignore-revs (next commit) so git blame skips it.
67 lines
2.6 KiB
Python
67 lines
2.6 KiB
Python
"""Thin on-disk cache + proxy helpers for Plex poster/art images.
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Posters/art/cast-photos are proxied on demand; without a cache every scroll re-hits Plex over the
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LAN (janky). We cache the fetched bytes on local disk keyed by a stable id, so repeat views (and
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other users) serve instantly from disk. On-demand + bounded by the library size; no eviction (a
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few hundred MB at most for a big library — acceptable, matching the download disk trade-offs).
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The cache directory (``cache.CACHE_DIR``) is shared with the subtitle cache (see ``subtitles.py``).
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"""
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from fastapi import Response
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from sqlalchemy.orm import Session
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from app.models import PlexCollection, PlexItem, PlexSeason, PlexShow
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from app.plex.cache import CACHE_DIR
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from app.plex.lookups import by_rating_key
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_EXT_CT = [("jpg", "image/jpeg"), ("png", "image/png"), ("webp", "image/webp")]
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_CT_EXT = {ct: ext for ext, ct in _EXT_CT}
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# Target box per variant — Plex resizes to these server-side. Posters fill ≤176px cells (grid/info/
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# strips), so 400px covers 2× DPR; the faint backdrop art only needs ~1280px. Keeps images ~tens of KB.
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SIZES = {"thumb": (400, 600), "art": (1280, 720)}
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def key_for(db: Session, rating_key: str, variant: str) -> str | None:
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"""The stored Plex image path for a known rating_key (item/show/season). Only mirrored keys
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are proxyable — this is not an open image proxy."""
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it = by_rating_key(db, PlexItem, rating_key)
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if it is not None:
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return it.art_key if variant == "art" else it.thumb_key
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sh = by_rating_key(db, PlexShow, rating_key)
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if sh is not None:
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return sh.art_key if variant == "art" else sh.thumb_key
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se = by_rating_key(db, PlexSeason, rating_key)
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if se is not None:
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return se.thumb_key
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col = by_rating_key(db, PlexCollection, rating_key)
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if col is not None:
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return col.thumb_key
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return None
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def read(key: str) -> tuple[bytes, str] | None:
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for ext, ct in _EXT_CT:
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p = CACHE_DIR / f"{key}.{ext}"
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try:
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if p.exists() and p.stat().st_size > 0:
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return p.read_bytes(), ct
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except OSError:
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pass
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return None
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def write(key: str, data: bytes, ct: str) -> None:
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ext = _CT_EXT.get((ct or "").split(";")[0].strip(), "jpg")
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try:
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CACHE_DIR.mkdir(parents=True, exist_ok=True)
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tmp = CACHE_DIR / f"{key}.{ext}.tmp"
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tmp.write_bytes(data)
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tmp.replace(CACHE_DIR / f"{key}.{ext}") # atomic publish
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except OSError:
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pass # cache is best-effort
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def response(data: bytes, ct: str) -> Response:
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return Response(content=data, media_type=ct, headers={"Cache-Control": "public, max-age=86400"})
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