peter
9f580fd8c8
- Uploads: one at a time per user and ten an hour, each refused only after its body arrived; the history read an entry at a time (32 MiB cap), a Watch later list capped at YouTube's 5000, a user's kept videos at 200k; any unreadable shape is a 422, not a 500. - Quota: Watch later lookups stop at the backfill reserve and at a per-user daily share; what is not asked about waits, known videos still go in, and the shorts job retries the rest. - Staging and settling share one per-user advisory lock (no deadlock); a run settles only the rows it read, so a row staged meanwhile is never called gone. - A failed run's notice names a translated failure, never the upstream's text. - The status says when an import is queued; the page watches it to its end even when left, then reads the feed, its counts and the playlists again. - Settings: one live region, the zone kept (unavailable) while a run goes, focus handed back, a missed drop kept from the browser, an oversize file refused before it is sent. - Scheduler and run lists show Takeout runs by the importing user.
494 lines
18 KiB
Python
494 lines
18 KiB
Python
"""Reader's reads: a user's labels, saved views, watch state, playlists and Takeout import, for the HTTP
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layer and for the other units that ask about them.
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Every read of a user's row goes through `userscope`, so "someone else's row" is the same answer as
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a missing one. Reader reads Catalog's videos along its declared edge (a playlist's cover and
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length, whether a video exists); another unit asks the questions at the end of this module rather
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than joining Reader's tables itself.
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"""
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from collections.abc import Iterable
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from datetime import datetime
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from sqlalchemy import ColumnElement, and_, func, or_, select
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from sqlalchemy.orm import InstrumentedAttribute, Session, aliased
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from app.collation import collated
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from app.feedquery import feed_columns, serialize
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from app.models import User
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from app.catalog.models import Channel, Subscription, Video
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from app.reader.models import (
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ChannelTag,
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Playlist,
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PlaylistItem,
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SavedView,
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Tag,
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TakeoutItem,
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TakeoutKind,
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VideoState,
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)
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from app.userscope import owned_by, owned_row
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# --- catalog, read along the edge ------------------------------------------------------------
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def video(db: Session, video_id: str) -> Video | None:
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return db.get(Video, video_id)
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# --- tags ------------------------------------------------------------------------------------
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def tags_with_counts(db: Session, user: User) -> list[tuple[Tag, int]]:
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"""The tags this user sees (the shared system ones and their own), each with how many channel
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links it has, by category then name."""
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return [
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(tag, count)
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for tag, count in db.execute(
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select(Tag, func.count(ChannelTag.id))
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.outerjoin(ChannelTag, ChannelTag.tag_id == Tag.id)
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.where(or_(Tag.user_id.is_(None), owned_by(Tag.user_id, user)))
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.group_by(Tag.id)
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.order_by(Tag.category, Tag.name)
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).tuples()
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]
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def own_tag(db: Session, user: User, tag_id: int) -> Tag | None:
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"""One of the user's own tags. A system tag (no owner) is nobody's to edit, so it reads as
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missing too."""
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return owned_row(db, Tag, tag_id, user)
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# --- saved views -----------------------------------------------------------------------------
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def views(db: Session, user: User, source: str) -> list[SavedView]:
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return list(
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db.execute(
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select(SavedView)
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.where(owned_by(SavedView.user_id, user), SavedView.source == source)
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.order_by(SavedView.position, SavedView.id)
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).scalars()
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)
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def all_views(db: Session, user: User) -> list[SavedView]:
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return list(db.execute(select(SavedView).where(owned_by(SavedView.user_id, user))).scalars())
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def own_view(db: Session, user: User, view_id: int) -> SavedView | None:
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return owned_row(db, SavedView, view_id, user)
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# --- watch state -----------------------------------------------------------------------------
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def video_state(db: Session, user: User, video_id: str) -> VideoState | None:
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return db.execute(
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select(VideoState).where(
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owned_by(VideoState.user_id, user), VideoState.video_id == video_id
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)
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).scalar_one_or_none()
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# --- playlists -------------------------------------------------------------------------------
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def own_playlist(
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db: Session, user: User, playlist_id: int, *, lock: bool = False
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) -> Playlist | None:
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return owned_row(db, Playlist, playlist_id, user, lock=lock)
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def playlists_for(db: Session, user: User) -> list[Playlist]:
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"""The user's playlists in their rail order."""
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return list(
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db.execute(
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select(Playlist)
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.where(owned_by(Playlist.user_id, user))
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.order_by(Playlist.position, Playlist.created_at)
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).scalars()
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)
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def watch_later(db: Session, user: User) -> Playlist | None:
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return db.scalar(
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select(Playlist).where(owned_by(Playlist.user_id, user), Playlist.kind == "watch_later")
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)
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def item_counts(db: Session, ids: list[int]) -> dict[int, int]:
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return dict(
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db.execute(
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select(PlaylistItem.playlist_id, func.count())
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.where(PlaylistItem.playlist_id.in_(ids))
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.group_by(PlaylistItem.playlist_id)
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)
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.tuples()
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.all()
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)
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def durations(db: Session, ids: list[int]) -> dict[int, int]:
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"""Each playlist's running time: the sum of its videos' lengths."""
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return {
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pid: int(total or 0)
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for pid, total in db.execute(
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select(PlaylistItem.playlist_id, func.coalesce(func.sum(Video.duration_seconds), 0))
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.join(Video, Video.id == PlaylistItem.video_id)
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.where(PlaylistItem.playlist_id.in_(ids))
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.group_by(PlaylistItem.playlist_id)
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).tuples()
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}
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def containing(db: Session, ids: list[int], video_id: str) -> set[int]:
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"""Which of these playlists already hold the video (the add-to-playlist popover's ticks)."""
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return set(
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db.execute(
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select(PlaylistItem.playlist_id).where(
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PlaylistItem.playlist_id.in_(ids), PlaylistItem.video_id == video_id
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)
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).scalars()
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)
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def covers(db: Session, ids: list[int]) -> dict[int, str | None]:
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"""Each playlist's cover: its first item's thumbnail, for every list in ONE window query rather
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than a lookup per playlist."""
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rn = (
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func.row_number()
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.over(partition_by=PlaylistItem.playlist_id, order_by=PlaylistItem.position)
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.label("rn")
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)
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first_items = (
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select(PlaylistItem.playlist_id.label("pid"), Video.thumbnail_url.label("thumb"), rn)
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.join(Video, Video.id == PlaylistItem.video_id)
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.where(PlaylistItem.playlist_id.in_(ids))
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.subquery()
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)
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return dict(
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db.execute(select(first_items.c.pid, first_items.c.thumb).where(first_items.c.rn == 1))
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.tuples()
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.all()
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)
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def playlist_totals(db: Session, playlist_id: int) -> tuple[int, int, str | None]:
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"""One playlist's item count, running time and cover. An outer join, so an empty list still
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answers (0, 0, None)."""
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count, total = db.execute(
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select(func.count(PlaylistItem.id), func.coalesce(func.sum(Video.duration_seconds), 0))
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.select_from(PlaylistItem)
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.outerjoin(Video, Video.id == PlaylistItem.video_id)
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.where(PlaylistItem.playlist_id == playlist_id)
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).one()
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cover = db.scalar(
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select(Video.thumbnail_url)
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.join(PlaylistItem, PlaylistItem.video_id == Video.id)
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.where(PlaylistItem.playlist_id == playlist_id)
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.order_by(PlaylistItem.position)
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.limit(1)
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)
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return count or 0, total or 0, cover
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def playlist_rows(db: Session, user: User, playlist_id: int) -> list:
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"""A playlist's videos as feed rows (the same columns the feed serializes), in list order."""
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state = aliased(VideoState)
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return list(
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db.execute(
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select(*feed_columns(user, state))
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.join(PlaylistItem, PlaylistItem.video_id == Video.id)
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.join(Channel, Channel.id == Video.channel_id)
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.outerjoin(state, and_(state.video_id == Video.id, owned_by(state.user_id, user)))
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.where(PlaylistItem.playlist_id == playlist_id)
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# `id` breaks a position tie the same way on every read (the renumbering add does too).
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.order_by(PlaylistItem.position, PlaylistItem.id)
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).all()
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)
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def items(db: Session, playlist_id: int) -> list[PlaylistItem]:
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"""A playlist's item rows, in list order."""
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return list(
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db.execute(
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select(PlaylistItem)
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.where(PlaylistItem.playlist_id == playlist_id)
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.order_by(PlaylistItem.position, PlaylistItem.id)
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).scalars()
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)
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def item(db: Session, playlist_id: int, video_id: str) -> PlaylistItem | None:
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return db.scalar(
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select(PlaylistItem).where(
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PlaylistItem.playlist_id == playlist_id, PlaylistItem.video_id == video_id
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)
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)
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# --- for the other units ---------------------------------------------------------------------
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def kept_by_a_reader(video_id: InstrumentedAttribute[str]) -> ColumnElement[bool]:
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"""A video someone holds: watched, in progress or hidden (a `VideoState`), or in one of their
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playlists. The catalog's cleanup jobs keep such a video; as a clause, so their DELETE stays
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one statement."""
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return or_(
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select(VideoState.id).where(VideoState.video_id == video_id).exists(),
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select(PlaylistItem.id).where(PlaylistItem.video_id == video_id).exists(),
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)
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def playlisted_by(db: Session, video_ids: list[str]) -> list[tuple[int, str]]:
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"""(user id, video id) for every user who has one of these videos in a playlist."""
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return list(
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db.execute(
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select(Playlist.user_id, PlaylistItem.video_id)
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.join(PlaylistItem, PlaylistItem.playlist_id == Playlist.id)
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.where(PlaylistItem.video_id.in_(video_ids))
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).tuples()
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)
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def has_auto_tags(channel_id: InstrumentedAttribute[str]) -> ColumnElement[bool]:
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"""A channel the auto-tagger has already labelled, as a clause for its "only the missing" scan."""
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return (
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select(ChannelTag.id)
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.where(
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ChannelTag.channel_id == channel_id,
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ChannelTag.source == "auto",
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ChannelTag.user_id.is_(None),
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)
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.exists()
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)
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def view_tag_ids(filters: object) -> list[int]:
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"""The tag ids a stored view's filters name; anything else in that slot names none."""
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tags = filters.get("tags") if isinstance(filters, dict) else None
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if not isinstance(tags, list):
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return []
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return [t for t in tags if type(t) is int] # `type`, not isinstance: True is not a tag id
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def tags_in_feed_views(db: Session) -> set[int]:
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"""Every tag id any user's saved feed view filters on. Read defensively (`view_tag_ids`): a view
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stored before its route checked the shape must not raise for everyone's job."""
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return {
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t
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for (filters,) in db.execute(select(SavedView.filters).where(SavedView.source == "feed"))
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for t in view_tag_ids(filters)
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}
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def held_by(db: Session, user: User, video_ids: list[str]) -> set[str]:
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"""Which of these videos the user already holds: watched, in progress or hidden, or in one of
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their playlists (a live search sinks them below the new finds)."""
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if not video_ids:
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return set()
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has_state = (
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select(VideoState.id)
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.where(VideoState.video_id == Video.id, owned_by(VideoState.user_id, user))
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.exists()
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)
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in_playlist = (
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select(PlaylistItem.id)
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.join(Playlist, Playlist.id == PlaylistItem.playlist_id)
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.where(PlaylistItem.video_id == Video.id, owned_by(Playlist.user_id, user))
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.exists()
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)
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return set(
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db.scalars(select(Video.id).where(Video.id.in_(video_ids), or_(has_state, in_playlist)))
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)
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def feed_rows_by_ids(db: Session, user: User, video_ids: list[str]) -> list[dict]:
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"""These videos serialized with the feed's projection (their channel, this user's watch state,
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saved), in the order given."""
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if not video_ids:
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return []
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state = aliased(VideoState)
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rows = db.execute(
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select(*feed_columns(user, state))
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.join(Channel, Channel.id == Video.channel_id)
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.outerjoin(state, and_(state.video_id == Video.id, owned_by(state.user_id, user)))
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.where(Video.id.in_(video_ids))
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).all()
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by_id = {r.id: serialize(r) for r in rows}
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return [by_id[i] for i in video_ids if i in by_id]
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def playlist_channels(db: Session, user: User, exclude: str | None, lang: str) -> list:
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"""The channels of the videos in the user's playlists that they don't subscribe to (`exclude`:
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their own channel), each with how many of those videos it has and across how many playlists;
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most present first, then by title in the reader's alphabet."""
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subscribed = select(Subscription.channel_id).where(owned_by(Subscription.user_id, user))
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q = (
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select(
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Channel,
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func.count(func.distinct(PlaylistItem.video_id)),
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func.count(func.distinct(Playlist.id)),
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)
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.select_from(PlaylistItem)
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.join(Playlist, Playlist.id == PlaylistItem.playlist_id)
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.join(Video, Video.id == PlaylistItem.video_id)
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.join(Channel, Channel.id == Video.channel_id)
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.where(owned_by(Playlist.user_id, user), Channel.id.not_in(subscribed))
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)
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if exclude:
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q = q.where(Channel.id != exclude)
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return list(
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db.execute(
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q.group_by(Channel.id).order_by(
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func.count(func.distinct(PlaylistItem.video_id)).desc(),
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collated(Channel.title, lang),
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)
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).all()
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)
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def user_tag_links(db: Session, user: User, channel_id: str | None = None) -> dict[str, list[int]]:
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"""The user's own tag links by channel (one channel's, when given)."""
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stmt = select(ChannelTag.channel_id, ChannelTag.tag_id).where(
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owned_by(ChannelTag.user_id, user)
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)
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if channel_id is not None:
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stmt = stmt.where(ChannelTag.channel_id == channel_id)
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out: dict[str, list[int]] = {}
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for cid, tag_id in db.execute(stmt).tuples():
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out.setdefault(cid, []).append(tag_id)
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return out
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def user_tag_link(db: Session, user: User, channel_id: str, tag_id: int) -> ChannelTag | None:
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return db.execute(
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select(ChannelTag).where(
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ChannelTag.channel_id == channel_id,
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ChannelTag.tag_id == tag_id,
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owned_by(ChannelTag.user_id, user),
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)
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).scalar_one_or_none()
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# --- Google Takeout --------------------------------------------------------------------------
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def takeout_watched_ready(db: Session, user: User) -> list[tuple[int, str, datetime, bool]]:
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"""The user's waiting "watched" rows whose video the catalog knows and has probed for Shorts:
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(row id, video id, Takeout time, is Short)."""
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return list(
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db.execute(
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select(TakeoutItem.id, TakeoutItem.video_id, TakeoutItem.at, Video.is_short)
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.join(Video, Video.id == TakeoutItem.video_id)
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.where(
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owned_by(TakeoutItem.user_id, user),
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TakeoutItem.kind == TakeoutKind.WATCHED,
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TakeoutItem.outcome.is_(None),
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Video.shorts_probed,
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)
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).tuples()
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)
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def takeout_waiting(db: Session, user: User, kind: TakeoutKind) -> list[tuple[int, str]]:
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"""The user's rows of `kind` the import has not settled, oldest first: (row id, video id)."""
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return list(
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db.execute(
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select(TakeoutItem.id, TakeoutItem.video_id)
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.where(
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owned_by(TakeoutItem.user_id, user),
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TakeoutItem.kind == kind,
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TakeoutItem.outcome.is_(None),
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)
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.order_by(TakeoutItem.at, TakeoutItem.id)
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).tuples()
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)
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# Ids per IN list: a list is bound one parameter an id, and a statement takes at most 65,535.
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_IN_CHUNK = 5000
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def known_video_ids(db: Session, ids: list[str]) -> set[str]:
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"""Which of `ids` the catalog holds."""
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known: set[str] = set()
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for start in range(0, len(ids), _IN_CHUNK):
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chunk = ids[start : start + _IN_CHUNK]
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known.update(db.execute(select(Video.id).where(Video.id.in_(chunk))).scalars())
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return known
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def takeout_rows_besides(
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db: Session, user: User, kind: TakeoutKind, video_ids: Iterable[str]
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) -> int:
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"""How many Takeout rows the user keeps other than `video_ids` of `kind`: what an upload of
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those videos would be added to."""
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total = (
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db.scalar(select(func.count(TakeoutItem.id)).where(owned_by(TakeoutItem.user_id, user)))
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or 0
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)
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ids = list(video_ids)
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for start in range(0, len(ids), _IN_CHUNK):
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total -= (
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db.scalar(
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select(func.count(TakeoutItem.id)).where(
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owned_by(TakeoutItem.user_id, user),
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TakeoutItem.kind == kind,
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TakeoutItem.video_id.in_(ids[start : start + _IN_CHUNK]),
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)
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)
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or 0
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)
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return total
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def takeout_outcomes(db: Session, user: User) -> dict[tuple[str, str | None], int]:
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"""How many of the user's rows each kind and outcome holds (None = waiting)."""
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rows = db.execute(
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select(TakeoutItem.kind, TakeoutItem.outcome, func.count())
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.where(owned_by(TakeoutItem.user_id, user))
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.group_by(TakeoutItem.kind, TakeoutItem.outcome)
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).all()
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return {(kind, outcome): n for kind, outcome, n in rows}
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def takeout_summary(db: Session, user: User) -> dict[str, dict[str, int]]:
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"""The user's kept Takeout videos by kind and outcome, for their settings page: `{"watched":
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{"watched": n, "short": n, "waiting": n, …}, "watch_later": {…}}` — the import's outcome words,
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"waiting" for a video not known yet."""
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out: dict[str, dict[str, int]] = {kind.value: {} for kind in TakeoutKind}
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for (kind, outcome), n in takeout_outcomes(db, user).items():
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out[kind][outcome or "waiting"] = n
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return out
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def takeout_users_ready(db: Session) -> list[int]:
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"""Every user with a waiting "watched" row whose video is now known and probed for Shorts: the
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rows a later run of the Shorts probe made ready."""
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return list(
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db.execute(
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select(TakeoutItem.user_id)
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.join(Video, Video.id == TakeoutItem.video_id)
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.where(
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TakeoutItem.kind == TakeoutKind.WATCHED,
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TakeoutItem.outcome.is_(None),
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Video.shorts_probed,
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)
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.distinct()
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).scalars()
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)
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def takeout_users_watch_later_waiting(db: Session) -> list[int]:
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"""Every user with a Watch later row a run could not put in yet."""
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|
return list(
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|
db.execute(
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|
select(TakeoutItem.user_id)
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|
.where(TakeoutItem.kind == TakeoutKind.WATCH_LATER, TakeoutItem.outcome.is_(None))
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|
.distinct()
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|
).scalars()
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|
)
|