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.
746 lines
33 KiB
Python
746 lines
33 KiB
Python
"""YouTube playlist sync, both directions. Read: mirror each user's own YouTube playlists
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into local `source='youtube'` playlists (kept fresh by the scheduler). Write-back: two-way sync
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local edits with YouTube (`plan_merge` / `merge_playlist`), behind the optional write scope; the
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pure 3-way merge they run is `sync/playlist_merge.py`.
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YouTube's special Watch Later / History playlists are not exposed by the Data API and are
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never synced. Videos in a playlist that aren't in our shared catalog yet are fetched and
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ingested (with a stub channel) so the mirror is faithful."""
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import hashlib
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import json
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from collections.abc import Callable, Iterator
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from contextlib import AbstractContextManager, contextmanager
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from typing import TypeVar
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from sqlalchemy import Engine, create_engine, delete, func, select
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from sqlalchemy.orm import Session
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from sqlalchemy.pool import NullPool
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from app import logs, progress, quota
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from app.auth import has_read_scope
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from app.models import User, Video
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from app.reader.models import Playlist, PlaylistItem
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from app.sync.playlist_merge import merge_plan
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from app.sync.runner import token_users
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from app.sync.subscriptions import blank_listing, refuse_blank_listing, vanished
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from app.sync.videos import ensure_videos
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from app.youtube.client import YouTubeClient, YouTubeError, is_playlist_gone
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from app.userscope import owned_by
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log = logs.get_logger(__name__)
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# Cost of a single YouTube write op (playlists/playlistItems insert/update/delete).
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WRITE_UNIT_COST = 50
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# The advisory-lock namespaces ("PL" per playlist, "PU" per user), so a key cannot meet another
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# feature's lock on the same number (Postgres keeps the two-int keys apart from the one-bigint ones).
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_SYNC_LOCK_NS = 0x504C
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_USER_SYNC_LOCK_NS = 0x5055
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# The claims' own connections, outside the app pool: a claim is held for a whole push (seconds of
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# YouTube calls) beside the request's pooled session and quota's, so a burst of pushes drawing a
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# third pooled connection each ran the pool dry and stalled every other request for pool_timeout.
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# NullPool opens one per claim and closes it after, so a lock can never ride back into a pool either.
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_claim_engines: dict[str, Engine] = {}
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def _claim_engine(db: Session) -> Engine:
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url = db.get_bind().engine.url
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key = url.render_as_string(hide_password=False)
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eng = _claim_engines.get(key)
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if eng is None:
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eng = _claim_engines[key] = create_engine(url, poolclass=NullPool, hide_parameters=True)
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return eng
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@contextmanager
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def _advisory_claim(db: Session, ns: int, key: int) -> Iterator[bool]:
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"""Try a session-level advisory lock for the block on a connection of its own; yields whether it
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was free. It survives the block's commits, and a crashed worker's lock dies with its connection
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— no claim column that a crash leaves stuck."""
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conn = _claim_engine(db).connect()
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held = False
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try:
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held = bool(conn.scalar(select(func.pg_try_advisory_lock(ns, key))))
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conn.commit()
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yield held
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finally:
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try:
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if held:
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conn.scalar(select(func.pg_advisory_unlock(ns, key)))
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conn.commit()
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finally:
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conn.close()
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def sync_claim(db: Session, playlist_id: int) -> AbstractContextManager[bool]:
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"""Claim one playlist's YouTube sync (push, re-pull, the scheduled mirror refresh) for the block;
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yields whether it was free. A push reads YouTube, then writes both sides for seconds and commits
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step by step, so a row lock ends at its first commit and two tabs (or a push and the scheduler)
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interleave into a doubled YouTube item or a baseline recorded over the other's writes."""
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return _advisory_claim(db, _SYNC_LOCK_NS, playlist_id)
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class PlaylistGone(Exception):
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"""The list a sync was working on was deleted meanwhile (another tab, the mirror drop). Its
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items went with it, so a plan made now reads "every item removed here" — and would delete them
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all from the YouTube playlist the reader chose to keep. The route answers 404."""
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def lock_playlists(db: Session, *playlist_ids: int) -> set[int]:
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"""Row-lock playlists before touching their items, several in id order. Every item write takes
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the PLAYLIST first — the route edits, a push, a re-pull, the scheduled mirror refresh and a
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delete alike: a writer that locked an item row first and the playlist second (a push's item
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replace beside a remove) deadlocks against one that went the other way, and the loser is a
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500. The rows are re-read, so `dirty`, the name and the sync baseline are the ones a finished
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writer committed. Held to the caller's next commit — so no commit may come between this and
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the write it guards. Returns the ids it found: a list deleted meanwhile is not among them."""
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rows = db.scalars(
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select(Playlist)
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.where(Playlist.id.in_(sorted(set(playlist_ids))))
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.order_by(Playlist.id)
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.with_for_update()
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.execution_options(populate_existing=True)
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).all() # consumed: rows fetched are what refreshes the loaded objects
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return {pl.id for pl in rows}
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def _lock_or_gone(db: Session, pl: Playlist) -> None:
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"""`lock_playlists` for a sync that goes on to write YouTube or the items: a list deleted since
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it was read raises `PlaylistGone` (rolled back) instead of being planned as an empty one."""
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pl_id = pl.id # read first: the rollback expires `pl`, and its row is gone
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if pl_id not in lock_playlists(db, pl_id):
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db.rollback()
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raise PlaylistGone(pl_id)
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def fingerprint(name: str, ids: list[str]) -> str:
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"""A stable checksum of a playlist's name + ordered video ids. Stored as the synced
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baseline; the current fingerprint is compared to it to derive `dirty`."""
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h = hashlib.sha256()
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h.update((name or "").encode())
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h.update(b"\n")
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h.update(",".join(ids).encode())
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return h.hexdigest()
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def current_fingerprint(db: Session, pl: Playlist) -> str:
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return fingerprint(pl.name, _local_video_ids(db, pl))
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def _dump_ids(ids: list[str]) -> str:
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"""Serialize the ordered id list stored as the 3-way-merge baseline (`synced_video_ids`)."""
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return json.dumps(ids)
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def _load_baseline(pl: Playlist) -> tuple[list[str] | None, set[str]]:
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"""Parse `synced_video_ids` into (ordered id set, un-ingestable id set). Two on-disk forms:
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a plain JSON list (legacy / no un-ingestable ids) or `{"ids": [...], "unavailable": [...]}`.
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`unavailable` = YouTube-only videos that exist on YouTube but the Data API won't return
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(private/deleted/region-locked), so they never became local rows — tracked so the merge can
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skip them instead of forever re-classifying them as a YouTube-add (they'd never converge)."""
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if not pl.synced_video_ids:
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return None, set()
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try:
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val = json.loads(pl.synced_video_ids)
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except (ValueError, TypeError) as exc:
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# No baseline means the three-way merge has no "what we last agreed on" to subtract, so
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# it degrades to a union: nothing is lost, but a delete made on either side comes back.
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log.warning(
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"the sync baseline for a playlist could not be read; merging as a union",
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extra=logs.event(
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"sync.playlist.baseline_unreadable",
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playlist_id=pl.id,
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reason=type(exc).__name__,
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),
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)
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return None, set()
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if isinstance(val, list):
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return [str(v) for v in val], set()
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if isinstance(val, dict):
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raw_ids = val.get("ids")
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ids = [str(v) for v in raw_ids] if isinstance(raw_ids, list) else None
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raw_un = val.get("unavailable")
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un = {str(v) for v in raw_un} if isinstance(raw_un, list) else set()
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return ids, un
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return None, set()
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def parse_baseline(pl: Playlist) -> list[str] | None:
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"""The last-synced ordered id set, or None when no baseline has been recorded yet (a fresh
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export, or an older link). None makes the first merge union losslessly."""
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return _load_baseline(pl)[0]
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def parse_unavailable(pl: Playlist) -> set[str]:
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"""The last-synced set of un-ingestable-but-live YouTube ids (see `_load_baseline`)."""
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return _load_baseline(pl)[1]
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def _set_baseline(
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pl: Playlist,
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ids: list[str],
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unavailable: list[str] | None = None,
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*,
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name: str | None = None,
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) -> None:
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"""Record `ids` as both the hash (drives `dirty`, over the local ids only) and the raw ordered
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set (drives merge). `unavailable` = un-ingestable-but-live YouTube ids to carry forward so the
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next merge skips them; stored only when non-empty (keeps the common case a plain list). `name`:
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the title YouTube now has, when that may differ from the list's own (see the push)."""
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pl.synced_fingerprint = fingerprint(pl.name if name is None else name, ids)
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if unavailable:
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pl.synced_video_ids = json.dumps({"ids": ids, "unavailable": list(unavailable)})
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else:
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pl.synced_video_ids = _dump_ids(ids)
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pl.dirty = False
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def _set_baseline_under_lock(
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db: Session,
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pl: Playlist,
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ids: list[str],
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unavailable: list[str] | None = None,
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*,
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name: str,
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) -> None:
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"""A push's closing baseline: `ids` and `name` are what YouTube now holds. The push spent
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seconds on YouTube writes since it replaced the local items, so an edit may have landed
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meanwhile — lock the list and derive `dirty` from what is there, or the edit would read as
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synced and never reach YouTube. The name too: the lock re-reads a rename made meanwhile, and a
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baseline taken over THAT name matched it, so the list read clean with YouTube's title still the
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old one."""
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_lock_or_gone(db, pl)
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_set_baseline(pl, ids, unavailable, name=name)
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recompute_dirty(db, pl)
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def recompute_dirty(db: Session, pl: Playlist) -> None:
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"""Set `dirty` by comparing the current state to the synced baseline. Unlinked lists
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(and Watch later) are never dirty; a missing baseline counts as dirty (unknown YT state)."""
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if not pl.yt_playlist_id:
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pl.dirty = False
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return
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# The session has autoflush off, so the caller's pending item/order/name edits aren't
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# visible to current_fingerprint's query yet — flush first or dirty would lag one edit.
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db.flush()
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pl.dirty = pl.synced_fingerprint != current_fingerprint(db, pl)
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def _replace_items_from_youtube(db: Session, pl: Playlist, ids: list[str]) -> list[str]:
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"""Mirror a YouTube playlist's ordered video ids into `pl`'s local items (authoritative
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replace): keep only those present in the catalog in their YT order (de-duplicated), swap the
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items out, and reset the synced fingerprint + dirty flag. The caller has ingested `ids`
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(`sync.videos.ensure_videos`, which commits) and THEN taken `lock_playlists`, set `pl.name`, and commits
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after: an ingest in here re-fetched every id YouTube will not return (a private or deleted
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video) and its commit let go of the lock before the replace. Returns the final ordered ids."""
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present = (
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set(db.execute(select(Video.id).where(Video.id.in_(ids))).scalars().all()) if ids else set()
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)
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ordered: list[str] = []
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seen: set[str] = set()
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for v in ids:
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if v in present and v not in seen:
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seen.add(v)
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ordered.append(v)
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_set_local_items(db, pl, ordered)
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# After a pull/reset local == YouTube, so this ordered set IS the new merge baseline.
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_set_baseline(pl, ordered)
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return ordered
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def _set_local_items(db: Session, pl: Playlist, ordered: list[str]) -> None:
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"""Authoritatively replace `pl`'s local items with `ordered` (positions 0..n). The caller
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is responsible for having ensured every id exists in the catalog."""
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db.execute(delete(PlaylistItem).where(PlaylistItem.playlist_id == pl.id))
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for pos, vid in enumerate(ordered):
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db.add(PlaylistItem(playlist_id=pl.id, video_id=vid, position=pos))
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def sync_user_playlists(db: Session, user: User) -> dict:
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"""Mirror the user's YouTube playlists into local source='youtube' playlists. Leaves
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the user's local playlists and the built-in Watch later untouched."""
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if not has_read_scope(user):
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return {"synced": 0, "reason": "no read scope"}
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with user_sync_claim(db, user.id) as free:
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if not free:
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return {"synced": 0, "reason": "busy"}
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return pull_user_playlists(db, user)
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def user_sync_claim(db: Session, user_id: int) -> AbstractContextManager[bool]:
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"""Claim a user's bulk mirror pull for the block; yields whether it was free. Two runs at once
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(the scheduler beside a manual "sync now", two tabs) both saw a YouTube list unmirrored and
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each created its mirror — a duplicate row."""
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return _advisory_claim(db, _USER_SYNC_LOCK_NS, user_id)
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def _mirror_listing(yt: YouTubeClient, ytid: str, count: object, pl_id: int) -> list[str] | None:
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"""A mirror's video ids from YouTube, or None when there is nothing to believe: the list was
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deleted between the pull's listing and this read (the next pull drops the mirror as vanished —
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not a reason to fail every other list), or YouTube listed no items for a
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list it counts as non-empty (`blank_listing`)."""
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try:
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ids = list(yt.iter_my_playlist_video_ids(ytid))
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except YouTubeError as exc:
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if not is_playlist_gone(exc):
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raise
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log.info("YouTube playlist of %s vanished mid-pull; skipped", pl_id)
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return None
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if blank_listing(ids, count):
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log.warning("YouTube listed no items for non-empty playlist %s; kept", pl_id)
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return None
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return ids
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def pull_user_playlists(db: Session, user: User) -> dict:
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"""The mirror pull itself; the caller holds `user_sync_claim`."""
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synced = 0
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with YouTubeClient(db, user) as yt:
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yt_playlists = list(yt.iter_my_playlists())
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yt_ids = {p["id"] for p in yt_playlists if p.get("id")}
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existing = {
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pl.yt_playlist_id: pl
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for pl in db.execute(
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select(Playlist).where(
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owned_by(Playlist.user_id, user.id), Playlist.source == "youtube"
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)
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).scalars()
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}
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# YouTube playlists that we already own as local (exported) playlists must not be
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# re-mirrored, or every exported list would also show up as a read-only duplicate.
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owned_yt_ids = set(
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db.execute(
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select(Playlist.yt_playlist_id).where(
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owned_by(Playlist.user_id, user.id),
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Playlist.source == "local",
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Playlist.yt_playlist_id.is_not(None),
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)
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).scalars()
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)
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# Drop vanished mirrors (none on an empty answer) — locked first, as every item write.
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gone = vanished(existing, yt_ids)
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if gone:
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lock_playlists(db, *(pl.id for pl in gone))
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for pl in gone:
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db.delete(pl)
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# Committed now: a run where no list below commits (all dirty, or all claimed) would
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# otherwise drop the deletions with the session.
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db.commit()
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for idx, p in enumerate(yt_playlists):
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ytid = p.get("id")
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if not ytid or ytid in owned_yt_ids:
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continue
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pl = existing.get(ytid)
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if pl is not None and pl.dirty:
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# Local edits not yet pushed: don't clobber them with YouTube's state.
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# A successful 'Sync to YouTube' clears dirty and lets the mirror refresh.
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continue
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if pl is None:
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pl = Playlist(
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user_id=user.id,
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name=p.get("title") or "Untitled",
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kind="user",
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source="youtube",
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yt_playlist_id=ytid,
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position=1000 + idx, # sort mirrored lists after local ones
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)
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db.add(pl)
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db.flush()
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with sync_claim(db, pl.id) as free:
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if not free:
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# The user is pushing or re-pulling this very list: it writes the same rows.
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# The next scheduled run refreshes it.
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continue
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ids = _mirror_listing(yt, ytid, p.get("item_count"), pl.id)
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if ids is None:
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db.rollback() # a mirror this run just created is not kept empty either
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continue
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# Ingest first — it commits — so the row lock below is held from the dirty check
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# to the commit that replaces the items.
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ensure_videos(db, yt, ids)
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# `dirty` read above is a snapshot from before the YouTube calls (sessions keep
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# loaded rows past a commit): a remove or reorder made meanwhile must not be
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# replaced by YouTube's order. Item writes lock the playlist row, so this waits for
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# one in flight and sees what it committed.
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lock_playlists(db, pl.id)
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if pl.dirty:
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db.rollback()
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continue
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pl.name = p.get("title") or pl.name
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# Mirror is authoritative: replace the items to match YouTube's order.
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_replace_items_from_youtube(db, pl, ids)
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db.commit()
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synced += 1
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return {"synced": synced}
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def _local_video_ids(db: Session, pl: Playlist) -> list[str]:
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return list(
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db.execute(
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select(PlaylistItem.video_id)
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.where(PlaylistItem.playlist_id == pl.id)
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.order_by(PlaylistItem.position)
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)
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.scalars()
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.all()
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)
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def plan_merge(db: Session, user: User, pl: Playlist, *, live=None) -> dict:
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"""Compute (without writing) what a two-way sync of this playlist would do: create vs
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update, how many items each side gains/loses, reorders, and the quota estimate (YouTube
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writes only — local edits are free). Reads live YouTube state (1 unit/page) for a linked
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playlist; nothing for a fresh export. `live` = a pre-fetched (current_items, snippet) tuple
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so the caller can share one read with merge_playlist."""
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local = _local_video_ids(db, pl)
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if not pl.yt_playlist_id:
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ops = 1 + len(local) # create the playlist + one insert per video
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return {
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"action": "create",
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"add_yt": len(local),
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"add_local": 0,
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"remove_yt": 0,
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"remove_local": 0,
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"to_reorder": 0,
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"rename": False,
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"units_estimate": ops * WRITE_UNIT_COST,
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}
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if live is not None:
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current, snippet = live
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else:
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with YouTubeClient(db, user) as yt:
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current = list(yt.iter_playlist_items_with_ids(pl.yt_playlist_id))
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snippet = yt.get_playlist_snippet(pl.yt_playlist_id)
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rename = bool(snippet) and (snippet.get("title") or "") != pl.name
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yt_ids = [it["video_id"] for it in current]
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refuse_blank_listing(yt_ids, (snippet or {}).get("item_count"))
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mp = merge_plan(parse_baseline(pl), local, yt_ids, parse_unavailable(pl))
|
|
ops = len(mp.add_to_yt) + len(mp.remove_from_yt) + mp.reorders + (1 if rename else 0)
|
|
return {
|
|
"action": "update",
|
|
"add_yt": len(mp.add_to_yt),
|
|
"add_local": len(mp.add_to_local),
|
|
"remove_yt": len(mp.remove_from_yt),
|
|
"remove_local": len(mp.remove_from_local),
|
|
"to_reorder": mp.reorders,
|
|
"rename": rename,
|
|
"units_estimate": ops * WRITE_UNIT_COST,
|
|
}
|
|
|
|
|
|
# After this many consecutive write failures we stop calling YouTube for the rest of the push.
|
|
# The failure modes that matter here are all account-wide, not per-video: quota exhausted, the
|
|
# write scope revoked, the token dead. Every remaining write then fails identically — but each
|
|
# one still SPENDS 50 units, so a long playlist burns through the whole (already dead) budget,
|
|
# and tomorrow's too, to produce a failure list we knew after the fifth item.
|
|
_MAX_CONSECUTIVE_FAILURES = 5
|
|
|
|
|
|
class _Failed:
|
|
"""Type of the `FAILED` sentinel, so `run()` can stay generic in the op's return type: a call
|
|
site gets back `str | _Failed` (not a bare `object`) and keeps its item id typed."""
|
|
|
|
|
|
#: Returned by `_Breaker.run` when the write did not happen (refused or failed).
|
|
FAILED = _Failed()
|
|
|
|
T = TypeVar("T")
|
|
|
|
|
|
class _Breaker:
|
|
"""Consecutive-failure circuit breaker for a single push run. Any success re-arms it.
|
|
|
|
Drive it with `run()` — it owns the whole open-check / call / record-outcome sequence, so a
|
|
write site can't accidentally implement two thirds of the protocol (forgetting to record a
|
|
failure would silently disable the breaker for that operation)."""
|
|
|
|
def __init__(
|
|
self, limit: int = _MAX_CONSECUTIVE_FAILURES, playlist_id: int | None = None
|
|
) -> None:
|
|
self.limit = limit
|
|
self.playlist_id = playlist_id # for the failure line only
|
|
self.streak = 0
|
|
self.tripped = False
|
|
|
|
def open(self) -> bool:
|
|
"""True while writes may still be attempted."""
|
|
return not self.tripped
|
|
|
|
def hit(self, ok: bool) -> None:
|
|
if ok:
|
|
self.streak = 0
|
|
return
|
|
self.streak += 1
|
|
if self.streak >= self.limit and not self.tripped:
|
|
self.tripped = True
|
|
log.warning(
|
|
"playlist push: %d consecutive YouTube write failures — stopping this run "
|
|
"(quota, scope or token); the remaining items are reported as failures",
|
|
self.limit,
|
|
)
|
|
|
|
def run(
|
|
self, op: Callable[[], T], on_fail: Callable[[], None], action: str = "write"
|
|
) -> T | _Failed:
|
|
"""Attempt one YouTube write. Returns the op's result, or `FAILED` when the breaker is
|
|
already tripped (op not called) or the op raised YouTubeError. `on_fail` records the item
|
|
in the caller's failure list either way."""
|
|
if self.tripped:
|
|
on_fail()
|
|
return FAILED
|
|
try:
|
|
out = op()
|
|
except YouTubeError as exc:
|
|
# The client logged the call, but not which playlist it was for or what kind of write
|
|
# — and the caller's failure list only ever reaches the user as a count. Not the video:
|
|
# what is in someone's playlist is a row of their history, the same as a download.
|
|
log.debug(
|
|
"a playlist write to YouTube failed",
|
|
extra=logs.event(
|
|
"sync.playlist.item_push_failed",
|
|
playlist_id=self.playlist_id,
|
|
action=action,
|
|
reason=exc.reason,
|
|
),
|
|
)
|
|
on_fail()
|
|
self.hit(False)
|
|
return FAILED
|
|
self.hit(True)
|
|
return out
|
|
|
|
|
|
def merge_playlist(db: Session, user: User, pl: Playlist, *, live=None) -> dict:
|
|
"""Two-way sync a local playlist with YouTube: create it on first push, else 3-way MERGE
|
|
both sides so an item added (or deleted) on either side survives — no side wins wholesale.
|
|
Local edits are applied directly; YouTube edits go through the failure breaker. On full
|
|
success the merged set becomes the new baseline and the playlist is marked clean; on any
|
|
YouTube failure the baseline is left untouched so the next sync retries and converges.
|
|
Caller must have checked the write scope and the quota budget. `live` = a pre-fetched
|
|
(current_items, snippet) tuple (from plan_merge's read) to avoid a second page-through."""
|
|
local = _local_video_ids(db, pl)
|
|
inserted = deleted = reordered = created = pulled = removed_local = 0
|
|
failures: list[str] = []
|
|
breaker = _Breaker(playlist_id=pl.id)
|
|
with YouTubeClient(db, user) as yt:
|
|
if not pl.yt_playlist_id:
|
|
pushed_name = pl.name
|
|
pl.yt_playlist_id = yt.create_playlist(pushed_name)
|
|
db.commit()
|
|
created = 1
|
|
# Brand-new playlist: just append every local video in order.
|
|
for vid in local:
|
|
added = breaker.run(
|
|
lambda v=vid: yt.add_playlist_item(pl.yt_playlist_id, v),
|
|
lambda v=vid: failures.append(v),
|
|
"add",
|
|
)
|
|
if not isinstance(added, _Failed):
|
|
inserted += 1
|
|
if not failures:
|
|
_set_baseline_under_lock(db, pl, local, name=pushed_name)
|
|
db.commit()
|
|
return {
|
|
"created": created,
|
|
"inserted": inserted,
|
|
"deleted": deleted,
|
|
"reordered": reordered,
|
|
"pulled": pulled,
|
|
"removed_local": removed_local,
|
|
"failures": failures,
|
|
"aborted": breaker.tripped,
|
|
"yt_playlist_id": pl.yt_playlist_id,
|
|
}
|
|
|
|
# Existing link: 3-way merge against the live YouTube state (reuse plan_merge's read).
|
|
if live is not None:
|
|
current, snippet = live
|
|
else:
|
|
snippet = yt.get_playlist_snippet(pl.yt_playlist_id)
|
|
current = list(yt.iter_playlist_items_with_ids(pl.yt_playlist_id))
|
|
item_id_by_vid = {it["video_id"]: it["item_id"] for it in current}
|
|
yt_ids = [it["video_id"] for it in current]
|
|
# A merge would read "YouTube lists none of them" as "YouTube deleted them all".
|
|
refuse_blank_listing(yt_ids, (snippet or {}).get("item_count"))
|
|
# Re-attempt ingestion of ids previously marked un-ingestable that are still on YouTube: a
|
|
# video that has since become available (e.g. private→public) should re-enter the merge, not
|
|
# stay skipped forever. Those that still won't ingest remain filtered (`effective_unavailable`).
|
|
prev_unavailable = parse_unavailable(pl)
|
|
still_listed = [v for v in yt_ids if v in prev_unavailable]
|
|
if still_listed:
|
|
ensure_videos(db, yt, still_listed)
|
|
healed = set(
|
|
db.execute(select(Video.id).where(Video.id.in_(still_listed))).scalars().all()
|
|
)
|
|
effective_unavailable = prev_unavailable - healed
|
|
else:
|
|
effective_unavailable = prev_unavailable
|
|
mp = merge_plan(parse_baseline(pl), local, yt_ids, effective_unavailable)
|
|
|
|
# --- Siftlode side (free, direct): pull YouTube-adds in, drop YouTube-deletes, land the
|
|
# merged order authoritatively. Do this first so local reflects the merge even if a later
|
|
# YouTube write trips the breaker.
|
|
ensure_videos(db, yt, mp.add_to_local)
|
|
# `local` was read before the YouTube calls above: an add or remove committed meanwhile
|
|
# (another tab) would be undone by the replace below. Lock the list — the ingest's commit is
|
|
# behind us — and plan again from what is there now. Nothing new needs ingesting: a video
|
|
# the re-read adds is already a local row. A list deleted meanwhile stops here, before a plan
|
|
# over its now-empty items removes them all from YouTube.
|
|
_lock_or_gone(db, pl)
|
|
local = _local_video_ids(db, pl)
|
|
mp = merge_plan(parse_baseline(pl), local, yt_ids, effective_unavailable)
|
|
# Only the ids that actually exist in the catalog can become local rows (a private/deleted
|
|
# YouTube video won't ingest); keep the merged order, dropping any that didn't materialize.
|
|
present = (
|
|
set(db.execute(select(Video.id).where(Video.id.in_(mp.final))).scalars().all())
|
|
if mp.final
|
|
else set()
|
|
)
|
|
final_local = [v for v in mp.final if v in present]
|
|
pulled = len([v for v in mp.add_to_local if v in present])
|
|
removed_local = len(mp.remove_from_local)
|
|
_set_local_items(db, pl, final_local)
|
|
db.commit()
|
|
|
|
# --- YouTube side (metered, breaker-guarded). The name as of the lock above: the closing
|
|
# baseline records THIS one, whatever a rename made during the writes below says.
|
|
pushed_name = pl.name
|
|
if snippet is not None and (snippet.get("title") or "") != pushed_name:
|
|
try:
|
|
yt.update_playlist_title(pl.yt_playlist_id, pushed_name)
|
|
except YouTubeError as exc:
|
|
# All the caller passes on is the word "title", which says the rename did not
|
|
# happen but not that YouTube refused it, or why.
|
|
log.debug(
|
|
"a playlist rename did not reach YouTube",
|
|
extra=logs.event(
|
|
"sync.playlist.title_push_failed",
|
|
playlist_id=pl.id,
|
|
reason=exc.reason,
|
|
),
|
|
)
|
|
failures.append("title")
|
|
# Propagate genuine local deletes.
|
|
for vid in mp.remove_from_yt:
|
|
item_id = item_id_by_vid.get(vid)
|
|
if item_id is None:
|
|
continue
|
|
dropped = breaker.run(
|
|
lambda i=item_id: yt.delete_playlist_item(i),
|
|
lambda v=vid: failures.append(v),
|
|
"delete",
|
|
)
|
|
if not isinstance(dropped, _Failed):
|
|
deleted += 1
|
|
item_id_by_vid.pop(vid, None)
|
|
# Insert local-adds (append; the reorder pass below fixes positions).
|
|
for vid in mp.add_to_yt:
|
|
item_id = breaker.run(
|
|
lambda v=vid: yt.add_playlist_item(pl.yt_playlist_id, v),
|
|
lambda v=vid: failures.append(v),
|
|
"add",
|
|
)
|
|
if not isinstance(item_id, _Failed):
|
|
item_id_by_vid[vid] = item_id
|
|
inserted += 1
|
|
# Reorder YouTube to match `final` via insertion-sort moves over a local model.
|
|
final_set = set(mp.final)
|
|
model = [v for v in yt_ids if v in final_set and v in item_id_by_vid] + [
|
|
v for v in mp.add_to_yt if v in item_id_by_vid
|
|
]
|
|
for i, want in enumerate(mp.final):
|
|
if want not in item_id_by_vid:
|
|
continue # deleted-from-YT or failed insert; skip
|
|
if i < len(model) and model[i] == want:
|
|
continue
|
|
moved = breaker.run(
|
|
lambda w=want, pos=i: yt.move_playlist_item(
|
|
item_id_by_vid[w], pl.yt_playlist_id, w, pos
|
|
),
|
|
lambda w=want: failures.append(w),
|
|
"move",
|
|
)
|
|
if isinstance(moved, _Failed):
|
|
continue
|
|
reordered += 1
|
|
j = model.index(want)
|
|
model.pop(j)
|
|
model.insert(i, want)
|
|
if not failures:
|
|
# Carry forward un-ingestable-but-live YouTube ids so the next merge skips them
|
|
# (see merge_plan): this run's failed pulls, plus prior ones still on YouTube, minus
|
|
# any that have since left YouTube. Recomputed each success → self-healing.
|
|
yt_id_set = set(yt_ids)
|
|
unavailable = sorted(
|
|
(effective_unavailable | {v for v in mp.add_to_local if v not in present})
|
|
& yt_id_set
|
|
)
|
|
_set_baseline_under_lock(db, pl, final_local, unavailable, name=pushed_name)
|
|
db.commit()
|
|
return {
|
|
"created": created,
|
|
"inserted": inserted,
|
|
"deleted": deleted,
|
|
"reordered": reordered,
|
|
"pulled": pulled,
|
|
"removed_local": removed_local,
|
|
"failures": failures,
|
|
"aborted": breaker.tripped,
|
|
"yt_playlist_id": pl.yt_playlist_id,
|
|
}
|
|
|
|
|
|
def repull_playlist(db: Session, user: User, pl: Playlist) -> dict:
|
|
"""Force-refresh ONE YouTube-linked playlist from YouTube, discarding local edits and
|
|
clearing dirty. This is the per-playlist 'reset to YouTube' — unlike the bulk read-sync
|
|
it deliberately does NOT skip a dirty playlist (overwriting local changes is the point).
|
|
Works for both mirrors (source='youtube') and exported local playlists (yt_playlist_id)."""
|
|
if not pl.yt_playlist_id:
|
|
raise YouTubeError("Playlist is not linked to YouTube")
|
|
with YouTubeClient(db, user) as yt:
|
|
snippet = yt.get_playlist_snippet(pl.yt_playlist_id)
|
|
if snippet is None:
|
|
raise YouTubeError(
|
|
"Playlist no longer exists on YouTube", reason="playlistNotFound", path="playlists"
|
|
)
|
|
ids = list(yt.iter_my_playlist_video_ids(pl.yt_playlist_id))
|
|
refuse_blank_listing(ids, snippet.get("item_count"))
|
|
ensure_videos(db, yt, ids)
|
|
_lock_or_gone(db, pl)
|
|
pl.name = snippet.get("title") or pl.name
|
|
ordered = _replace_items_from_youtube(db, pl, ids)
|
|
db.commit()
|
|
return {"items": len(ordered)}
|
|
|
|
|
|
def sync_all_playlists(db: Session) -> dict:
|
|
"""Scheduler entry point: mirror playlists for every user with a read scope + token."""
|
|
users = token_users(db)
|
|
total = 0
|
|
for i, user in enumerate(users, 1):
|
|
if not has_read_scope(user):
|
|
progress.report(i, len(users), "playlist_sync")
|
|
continue
|
|
try:
|
|
with quota.attribute(user.id, quota.QuotaAction.PLAYLISTS_PULL):
|
|
total += sync_user_playlists(db, user).get("synced", 0)
|
|
except YouTubeError as exc:
|
|
db.rollback()
|
|
log.warning(
|
|
"Playlist sync failed for user %s",
|
|
user.id,
|
|
extra=logs.event("sync.playlists.failed", user_id=user.id, reason=exc.reason),
|
|
)
|
|
except Exception:
|
|
db.rollback()
|
|
log.exception(
|
|
"Playlist sync crashed for user %s",
|
|
user.id,
|
|
extra=logs.event("sync.playlists.crashed", user_id=user.id),
|
|
)
|
|
progress.report(i, len(users), "playlist_sync")
|
|
return {"users": len(users), "playlists_synced": total}
|