peter
dbb4065e7b
Feed, playlists, saved views, tags and the Home pins do no database work in their routes any more: reads go through reader/queries (and feedquery for a feed page, its counts and facets), writes through reader/service and discover/pins, which flush; the handlers commit. Reader is fenced below its HTTP layer too: its owner filters go through userscope, and the catalog's jobs ask Reader instead of joining its tables (the auto-tagger's system tags, the cleanup jobs' keep rule, the maintenance notice). A playlist sync's catalog ingest moves to sync/videos.
176 lines
8.0 KiB
Python
176 lines
8.0 KiB
Python
"""Channel exploration: ingest an un-subscribed channel's uploads on demand (flagged
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via_explore, kept per-explorer) and purge channels nobody ends up keeping.
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A user opens a channel's page without subscribing → we pull a page of its recent uploads,
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mark the new rows via_explore, and enrich them so they're immediately browsable. The videos
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stay private to users who explored (or subscribe to) the channel — the feed query gates them
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— so one user's curiosity never floods everyone's catalog. Subscribing is the "keep" signal;
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otherwise the cleanup job hard-deletes the channel and its untouched ephemeral videos after a
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grace period (mirrors the maintenance job's grace-then-delete safety)."""
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from datetime import datetime, timedelta, timezone
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from sqlalchemy import delete, or_, select
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from sqlalchemy.orm import Session
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from app import logs, sysconfig
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from app.models import Channel, ExploredChannel, SearchFind, Subscription, Video
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from app.reader import queries as reader_queries
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from app.sync.videos import insert_stubs, stub_from_playlist_item, apply_video_details
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from app.youtube.client import YouTubeClient, YouTubeError, is_playlist_gone
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log = logs.get_logger(__name__)
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def followed_channel():
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"""WHERE clause: a channel somebody follows — a subscription, or an exploration still inside its
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grace window (`purge_unkept_explored` deletes the expired ExploredChannel rows first). ONE
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definition for both halves of the question: what the scheduled RSS poll and recent backfill cover
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(sync/runner.py) and what the explore purge may delete.
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The poll and backfill cover only these (owner decision, 2026-09-17). They used to cover EVERY
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channel row, but rows also come from search results, playlist sync and dropped subscriptions, and
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nothing deletes those: on prod 582 of 979 polled channels had no follower, three of them dead
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feeds answering 404 on every poll. The cost of narrowing is deliberate: the shared Library stops
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receiving new uploads from channels nobody follows."""
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return or_(
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select(Subscription.id).where(Subscription.channel_id == Channel.id).exists(),
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select(ExploredChannel.id).where(ExploredChannel.channel_id == Channel.id).exists(),
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)
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def _enrich_new(db: Session, yt: YouTubeClient, video_ids: list[str]) -> int:
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"""Enrich just the not-yet-enriched videos among `video_ids` (videos.list, 1 unit/50)."""
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if not video_ids:
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return 0
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videos = (
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db.execute(select(Video).where(Video.id.in_(video_ids), Video.enriched_at.is_(None)))
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.scalars()
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.all()
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)
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if not videos:
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return 0
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items = {it["id"]: it for it in yt.get_videos([v.id for v in videos])}
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now = datetime.now(timezone.utc)
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for video in videos:
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item = items.get(video.id)
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if item is None:
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video.enriched_at = now # unavailable; stop retrying
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continue
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apply_video_details(video, item)
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video.enriched_at = now
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db.commit()
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return len(videos)
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def explore_ingest_page(
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db: Session, yt: YouTubeClient, channel: Channel, page_token: str | None = None
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) -> dict:
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"""Ingest one page (up to 50, newest-first) of the channel's uploads, marking the new
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videos via_explore, then enrich them. Returns the count ingested and the next page token
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(None when the back-catalogue is exhausted) so the caller can offer "load more". Stateless
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pagination: the caller round-trips the token, so the channel's own backfill cursor (used by
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the organic deep backfill) is never touched."""
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if not channel.uploads_playlist_id:
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return {"ingested": 0, "next_page_token": None}
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try:
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data = yt.get_playlist_items(channel.uploads_playlist_id, page_token)
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except YouTubeError as exc:
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# A channel with no uploads has an uploads id that YouTube answers as not found: an empty
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# back-catalogue, not a failure (and not a "playlist gone" — the user picked a channel).
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if not is_playlist_gone(exc):
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raise
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log.info("explore ingest channel=%s has no uploads playlist", channel.id)
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return {"ingested": 0, "next_page_token": None}
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stubs: list[dict] = []
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for item in data.get("items", []):
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stub = stub_from_playlist_item(item, channel.id)
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if stub is not None:
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stub["via_explore"] = True
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stubs.append(stub)
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inserted = insert_stubs(db, stubs)
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self_enriched = _enrich_new(db, yt, [s["id"] for s in stubs])
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log.info(
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"explore ingest channel=%s ingested=%s enriched=%s", channel.id, inserted, self_enriched
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)
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return {"ingested": inserted, "next_page_token": data.get("nextPageToken")}
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def purge_unkept_explored(db: Session) -> dict:
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"""Cleanup job: hard-delete explored channels nobody kept and their untouched ephemeral
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videos, after a grace period (mirrors the maintenance grace-then-delete safety).
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Keep signals that spare a channel/video:
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- any user SUBSCRIBES to the channel (subscribe promotes it to organic — channel-level), or
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- a live ExploredChannel row (someone explored it within the grace window — channel-level), or
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- a video has per-user state: watched/in-progress (VideoState), in a playlist (PlaylistItem),
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or surfaced by the user's own search (SearchFind) — these survive even if the channel goes.
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A channel row is dropped only once it holds no videos at all. 0 quota."""
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grace_days = sysconfig.get_int(db, "explore_grace_days")
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cutoff = datetime.now(timezone.utc) - timedelta(days=grace_days)
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expired = db.execute(
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delete(ExploredChannel).where(ExploredChannel.created_at < cutoff)
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).rowcount
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db.commit()
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orphan_ids = (
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db.execute(select(Channel.id).where(Channel.from_explore.is_(True), ~followed_channel()))
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.scalars()
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.all()
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)
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if not orphan_ids:
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return {"expired": expired, "videos_deleted": 0, "channels_deleted": 0}
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find_exists = select(SearchFind.id).where(SearchFind.video_id == Video.id).exists()
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videos_deleted = db.execute(
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delete(Video).where(
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Video.channel_id.in_(orphan_ids),
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Video.via_explore.is_(True),
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~reader_queries.kept_by_a_reader(Video.id),
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~find_exists,
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)
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).rowcount
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db.commit()
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has_videos = select(Video.id).where(Video.channel_id == Channel.id).exists()
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channels_deleted = db.execute(
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delete(Channel).where(Channel.id.in_(orphan_ids), ~has_videos)
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).rowcount
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db.commit()
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return {
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"expired": expired,
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"videos_deleted": videos_deleted,
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"channels_deleted": channels_deleted,
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}
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def purge_unkept_search(db: Session, grace_days: int | None = None) -> dict:
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"""Remove live-search result videos nobody kept, after a grace period — "as if never added".
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A `via_search` video is KEPT (and spared) when anyone has watched / in-progress / hidden it
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(a VideoState), saved/playlisted it (a PlaylistItem), or subscribes to its channel (it's then
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organically owned). A bare SearchFind does NOT count — it's the ephemeral "shown in search"
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marker itself — so a result you only glanced at is reclaimed. Deleting the video cascades its
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SearchFinds. `grace_days=0` purges immediately (the admin "purge now" path); None uses config.
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0 quota."""
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grace = sysconfig.get_int(db, "search_grace_days") if grace_days is None else grace_days
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cutoff = datetime.now(timezone.utc) - timedelta(days=grace)
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sub_exists = select(Subscription.id).where(Subscription.channel_id == Video.channel_id).exists()
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deleted = db.execute(
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delete(Video).where(
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Video.via_search.is_(True),
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Video.created_at < cutoff,
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~reader_queries.kept_by_a_reader(Video.id),
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~sub_exists,
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)
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).rowcount
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db.commit()
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return {"search_videos_deleted": deleted}
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def purge_ephemeral(db: Session) -> dict:
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"""The scheduler's discovery-cleanup pass: reclaim un-kept explored channels AND un-kept
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live-search result videos in one run."""
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return {**purge_unkept_explored(db), **purge_unkept_search(db)}
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