bvandeusen
7a872a3619
A media that fails every walk (404'd CDN, deleted post, geo-blocked Mux, persistently-corrupt bytes) used to re-error forever and re-burn chunks. New `patreon_failed_media` table (alembic 0038, chains 0037) records per-media attempts; once attempts reach DEAD_LETTER_THRESHOLD (3) the ingester skips it on routine tick/backfill walks (tier-1.5, folded into the seen/skip predicate). Recovery BYPASSES it (the operator's "try everything again" re-attempts dead media). A clean download clears the row (recovered); errors/quarantines upsert-increment it. Surfaced as run_stats.dead_lettered_count. - New PatreonFailedMedia model + migration; ingester _dead_keys / _record_failures (on_conflict increment) / _clear_failures. - skip = seen | dead (empty in recovery); failures recorded post-fetch on short sessions (same pattern as the seen-ledger). Tests: a media erroring 3× is dead-lettered + skipped (no download attempt); recovery re-attempts a dead media and clears it on success; a clean download clears a sub-threshold failure. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
572 lines
26 KiB
Python
572 lines
26 KiB
Python
"""Native Patreon ingester — phase-2 orchestrator (build step 3).
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Ties build steps 1 (`patreon_client`) and 2 (`patreon_downloader` +
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`patreon_seen_media`) together into a single sync walk that REPLACES the
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gallery-dl subprocess for Patreon. `download_service.download_source` calls
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`PatreonIngester.run(...)` from phase 2 (in a thread, via run_in_executor, since
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everything here is sync `requests`/`subprocess`) and gets back a
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`DownloadResult` — the exact shape gallery-dl returns — so phase 1 (DB setup)
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and phase 3 (import → pHash dedup → thumbnails → ML) are untouched and cannot
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tell the difference.
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Three modes (selected by `download_service` from `config_overrides` state):
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- tick — newest→oldest, skip seen (tier-1 ledger + tier-2 disk), early-out
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after N contiguous already-have-it items (the cheap native
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equivalent of gallery-dl's `exit:20`, now free of per-file HEADs).
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- backfill — full-history walk in a time-boxed chunk, resuming from the
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pagination cursor checkpoint; reaches the bottom → "complete".
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- recovery — like backfill but BYPASSES the tier-1 seen-ledger, so
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deliberately-dropped-and-deleted near-dups get re-fetched and
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re-evaluated under the current pHash threshold (tier-2 disk skip
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still spares files we kept). Triggered by the same #693 backfill
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state machine plus the `_backfill_bypass_seen` flag, so the whole
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cursor/chunk/complete/stall lifecycle is reused verbatim.
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Cursor contract: the ingester emits gallery-dl-style ``Cursor: <token>`` lines
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into the returned `stdout`, one per page it walks. That is exactly what
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`download_service`'s existing backfill lifecycle reads via
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`parse_last_cursor(stdout, stderr)` — so checkpointing, the TIMEOUT→PARTIAL
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reclassification, and completion detection all keep working unchanged.
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The seen-ledger lives in Postgres (`patreon_seen_media`). The ingester opens a
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SHORT-LIVED sync session per page batch (via an injected sessionmaker) — never
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held across a network fetch — so the multi-minute walk can't strand a checked-out
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connection for the server to reap ([[db-connection-held-across-subprocess]]).
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FC runs on a plain-HTTP homelab; nothing here uses a secure-context Web API.
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"""
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from __future__ import annotations
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import asyncio
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import logging
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import time
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from collections.abc import Callable
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from pathlib import Path
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from sqlalchemy import delete, func, select, text
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from sqlalchemy.dialects.postgresql import insert as pg_insert
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from ..models import PatreonFailedMedia, PatreonSeenMedia
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from .gallery_dl import DownloadResult, ErrorType
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from .patreon_client import (
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MediaItem,
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PatreonAPIError,
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PatreonAuthError,
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PatreonClient,
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PatreonDriftError,
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)
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from .patreon_downloader import PatreonDownloader
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from .patreon_resolver import resolve_campaign_id_for_source
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log = logging.getLogger(__name__)
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# gallery-dl's `exit:20` default ported over: stop a tick after this many
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# CONTIGUOUS already-have-it media (seen-ledger or on-disk). Native walks have
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# zero per-file HEADs, so the only cost of a higher number is a few extra cheap
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# ledger lookups — 20 is operator-set headroom against paywalled/undownloadable
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# items interleaving with archived ones.
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_TICK_SEEN_THRESHOLD = 20
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# Ledger keys are stored in patreon_seen_media.filehash VARCHAR(128); bound any
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# synthesized key so a pathologically long file_name can't overflow the column.
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_LEDGER_KEY_MAX = 128
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# plan #705 #7: after this many failed download/validate attempts a media is
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# "dead-lettered" and skipped on routine tick/backfill walks (recovery still
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# re-attempts it). Stops a permanently-broken media (404'd CDN, deleted post)
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# re-erroring forever and re-burning chunks.
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DEAD_LETTER_THRESHOLD = 3
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# last_error is Text but bound it so a giant traceback doesn't bloat the row.
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_ERROR_MAX = 1000
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def _ledger_key(media: MediaItem) -> str:
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"""Stable per-media identity for the cross-run seen-ledger.
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A Patreon CDN URL carries a 32-char MD5 (`media.filehash`) — that is the
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natural key. Some media have none: Mux/HLS video (`stream.mux.com`, no
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content hash at discovery) and the odd inline-content `<img>` pointing at a
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hashless URL. The plan calls the video case the ``video:<post_id>:<media_id>``
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sentinel; `MediaItem` carries no media_id, so the post-scoped filename is the
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stable proxy. Bounded to the column width.
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"""
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if media.filehash:
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return media.filehash
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return f"{media.post_id}:{media.filename}"[:_LEDGER_KEY_MAX]
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class PatreonIngester:
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"""Walk a Patreon campaign's posts, download unseen media, return a
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`DownloadResult`.
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Construct with the per-source `cookies_path` and a sync sessionmaker for the
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seen-ledger. `client` / `downloader` are injectable seams so unit tests run
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without network, subprocess, or a real CDN.
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"""
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def __init__(
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self,
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images_root: Path,
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cookies_path: str | None,
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session_factory: Callable[[], object],
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*,
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validate: bool = True,
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rate_limit: float = 0.0,
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request_sleep: float = 0.0,
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client: PatreonClient | None = None,
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downloader: PatreonDownloader | None = None,
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):
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self.images_root = Path(images_root)
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self.cookies_path = str(cookies_path) if cookies_path else None
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self.session_factory = session_factory
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# Pacing (plan #703): request_sleep paces the API page fetches,
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# rate_limit paces the media downloads. Injected client/downloader (in
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# tests) already carry their own pacing, so these only apply to the
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# default-constructed ones.
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self.client = (
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client
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if client is not None
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else PatreonClient(cookies_path, request_sleep=request_sleep)
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)
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self.downloader = (
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downloader
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if downloader is not None
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else PatreonDownloader(
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self.images_root, cookies_path, validate=validate, rate_limit=rate_limit
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)
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)
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# -- public ------------------------------------------------------------
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def run(
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self,
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*,
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source_id: int,
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campaign_id: str,
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artist_slug: str,
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url: str,
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mode: str,
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resume_cursor: str | None = None,
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time_budget_seconds: float = 870.0,
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seen_threshold: int = _TICK_SEEN_THRESHOLD,
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) -> DownloadResult:
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"""Walk + download for one source, returning a gallery-dl-shaped result.
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`mode` is "tick" | "backfill" | "recovery". Recovery bypasses the tier-1
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seen-ledger (tier-2 disk still skips kept files). The walk stops on:
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- budget exhaustion (time_budget_seconds) → TIMEOUT / PARTIAL
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- tick early-out (seen_threshold contiguous seen) → success
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- reaching the bottom of the feed → success (rc 0)
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A client-level failure (drift / auth / network) fails the whole run loud.
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"""
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bypass_seen = mode == "recovery"
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# Only deep walks checkpoint their cursor mid-flight (plan #705 #6); a
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# tick has no resumable backfill state.
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checkpoint = mode in ("backfill", "recovery")
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start = time.monotonic()
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log_lines: list[str] = []
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written: list[str] = []
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quarantined_paths: list[str] = []
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downloaded = 0
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errors = 0
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quarantined = 0
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dead_lettered = 0
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skipped_count = 0
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posts_processed = 0
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consecutive_seen = 0
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emitted_cursor: str | None = None
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reached_bottom = False
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budget_hit = False
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early_out = False
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def _result(
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*, success: bool, return_code: int,
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error_type: ErrorType | None, error_message: str | None,
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) -> DownloadResult:
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# plan #704: return STRUCTURED data — phase 3 reads run_stats/cursor
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# directly instead of regex-scraping a reconstructed stdout. stdout
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# stays a human-readable summary (no fake `Cursor:` lines).
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return DownloadResult(
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success=success,
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url=url,
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artist_slug=artist_slug,
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platform="patreon",
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files_downloaded=downloaded,
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files_quarantined=quarantined,
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quarantined_paths=list(quarantined_paths),
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written_paths=written,
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stdout="\n".join(log_lines),
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stderr="",
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return_code=return_code,
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error_type=error_type,
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error_message=error_message,
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duration_seconds=time.monotonic() - start,
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cursor=emitted_cursor,
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posts_processed=posts_processed,
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run_stats={
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"exit_code": return_code,
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"downloaded_count": downloaded,
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"skipped_count": skipped_count,
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"per_item_failures": errors,
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"warning_count": 0,
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"tier_gated_count": 0,
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"quarantined_count": quarantined,
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"dead_lettered_count": dead_lettered,
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},
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)
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try:
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for post, included, page_cursor in self.client.iter_posts(
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campaign_id, cursor=resume_cursor
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):
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# Checkpoint the cursor that FETCHED this page the moment we
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# START it — so a chunk cut mid-page resumes the page, not the one
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# after it. Carried as DownloadResult.cursor (plan #704); no fake
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# `Cursor:` stdout line to regex back out.
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if page_cursor and page_cursor != emitted_cursor:
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emitted_cursor = page_cursor
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# plan #705 #6: persist the cursor at each page boundary so a
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# worker SIGKILL mid-chunk resumes near the crash, not the
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# chunk start. (phase 3 still writes the final cursor — same
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# value; this is the crash-safety net.)
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if checkpoint:
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self._checkpoint_cursor(source_id, emitted_cursor)
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# Time-box check at the post boundary (coarse, like a gallery-dl
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# chunk). Backfill/recovery resume from emitted_cursor next chunk.
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if time.monotonic() - start >= time_budget_seconds:
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budget_hit = True
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break
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posts_processed += 1
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media = self.client.extract_media(post, included)
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if not media:
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continue
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keys = [_ledger_key(m) for m in media]
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# Recovery bypasses BOTH the seen-ledger AND the dead-letter
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# ledger (the operator's "try everything again"); routine walks
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# skip seen + dead media (tier-1 + tier-1.5, plan #705 #7).
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dead = set() if bypass_seen else self._dead_keys(source_id, keys)
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seen = (
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set()
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if bypass_seen
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else self._seen_keys(source_id, keys)
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)
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skip = seen | dead
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def _is_skip(m: MediaItem, _skip=skip) -> bool:
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return _ledger_key(m) in _skip
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outcomes = self.downloader.download_post(
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post, media, artist_slug, is_seen=_is_skip
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)
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to_mark: list[tuple[str, str]] = []
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to_clear: list[str] = [] # recovered → drop any dead-letter row
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to_fail: list[tuple[str, str, str]] = [] # (key, post_id, error)
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for media_item, outcome in zip(media, outcomes, strict=False):
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key = _ledger_key(media_item)
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if key in dead:
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dead_lettered += 1 # skipped because previously dead
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if outcome.status == "downloaded":
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downloaded += 1
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if outcome.path is not None:
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written.append(str(outcome.path))
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to_mark.append((key, media_item.post_id))
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to_clear.append(key)
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consecutive_seen = 0
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elif outcome.status == "skipped_disk":
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# Already on disk (a prior run). Reconcile the ledger so a
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# later tick skips it at tier-1 without a disk stat, but
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# do NOT re-feed it to phase 3 — attach_in_place would see
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# the duplicate sha256 and unlink the on-disk copy.
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to_mark.append((key, media_item.post_id))
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to_clear.append(key)
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skipped_count += 1
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consecutive_seen += 1
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elif outcome.status == "skipped_seen":
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skipped_count += 1
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consecutive_seen += 1
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elif outcome.status == "quarantined":
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# New content that failed validation (corrupt) — counted
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# distinctly so the run surfaces a real quarantined total.
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# Not marked seen (a later walk may re-fetch a fixed file);
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# it IS new content, so it breaks the run-of-seen. Counts
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# toward the dead-letter ledger (plan #705 #7).
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quarantined += 1
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if outcome.path is not None:
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quarantined_paths.append(str(outcome.path))
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to_fail.append((key, media_item.post_id, outcome.error or "quarantined"))
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consecutive_seen = 0
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elif outcome.status == "error":
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errors += 1
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to_fail.append((key, media_item.post_id, outcome.error or "error"))
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# An error neither advances nor resets the run-of-seen.
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if mode == "tick" and consecutive_seen >= seen_threshold:
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early_out = True
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break
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# Persist ledger changes AFTER the network fetch, on short
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# sessions: mark downloaded/on-disk seen, clear any dead-letter
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# for recovered media, and record failures (plan #705 #7).
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if to_mark:
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self._mark_seen(source_id, to_mark)
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if to_clear:
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self._clear_failures(source_id, to_clear)
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if to_fail:
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self._record_failures(source_id, to_fail)
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if early_out:
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break
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else:
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reached_bottom = True
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except PatreonAPIError as exc:
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# Base of PatreonAuthError + PatreonDriftError — catches every
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# client-level failure; _failure_result maps it to a typed error.
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return self._failure_result(exc, _result)
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if errors:
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log_lines.append(f"{errors} media item(s) failed")
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if quarantined:
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log_lines.append(f"{quarantined} media item(s) quarantined (invalid)")
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if dead_lettered:
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log_lines.append(f"{dead_lettered} media item(s) skipped (dead-lettered)")
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log_lines.append(
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f"Patreon ingest ({mode}): {downloaded} downloaded, "
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f"{skipped_count} skipped, {quarantined} quarantined, "
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f"{dead_lettered} dead-lettered, {errors} error(s), "
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f"{posts_processed} post(s)"
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+ (", reached end" if reached_bottom else "")
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+ (", time-boxed" if budget_hit else "")
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)
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if budget_hit:
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# A chunk that hit its time-box but made forward progress is a
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# NORMAL chunk boundary, not a failure (PARTIAL → status "ok"); the
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# next chunk resumes from the emitted cursor. No progress → TIMEOUT,
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# which feeds download_service's backfill stall-guard. rc<0 mirrors
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# subprocess TimeoutExpired so completion detection stays false.
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made_progress = downloaded > 0 or emitted_cursor != resume_cursor
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if made_progress:
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return _result(
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success=False, return_code=-1,
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error_type=ErrorType.PARTIAL,
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error_message=(
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f"Patreon backfill chunk: {downloaded} file(s) — continuing"
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),
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)
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return _result(
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success=False, return_code=-1,
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error_type=ErrorType.TIMEOUT,
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error_message="Patreon chunk timed out with no progress",
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)
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# Normal success: reached the bottom, or a tick that early-outed. rc 0 +
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# error_type None is REQUIRED for a backfill/recovery walk that reached
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# the bottom to be marked COMPLETE by
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# download_service._apply_backfill_lifecycle — so we return None even
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# when downloaded == 0 (a re-confirming walk that found nothing new still
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# completed). NO_NEW_CONTENT would read as "not finished" there and trip
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# the stall guard. success=True maps to status "ok" regardless. A tick
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# that early-outed also returns here; ticks never set backfill state so
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# the lifecycle is a no-op for them.
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return _result(
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success=True, return_code=0,
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error_type=None, error_message=None,
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)
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# -- failure mapping ---------------------------------------------------
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def _failure_result(self, exc: Exception, _result) -> DownloadResult:
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"""Map a client-level exception to a loud, typed failed DownloadResult.
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We NEVER return a silent zero-download "success" — the whole point of the
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native ingester is to fail RED when Patreon's API shape or our auth
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changes. The typed mapping lets FailingSourcesCard render the right chip
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and tells the operator what to do:
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- PatreonAuthError → AUTH_ERROR (rotate cookies)
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- PatreonDriftError → API_DRIFT (ingester field-set/parser needs update)
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- HTTP 429 / 404 → RATE_LIMITED / NOT_FOUND
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- other HTTP status → HTTP_ERROR; transport failure → NETWORK_ERROR
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PatreonAuthError and PatreonDriftError both subclass PatreonAPIError, so
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they must be matched before the generic HTTP/transport fallthrough.
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"""
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message = str(exc)
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if isinstance(exc, PatreonAuthError):
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error_type = ErrorType.AUTH_ERROR
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elif isinstance(exc, PatreonDriftError):
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error_type = ErrorType.API_DRIFT
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message = f"Patreon API changed — ingester needs update: {message}"
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else: # generic PatreonAPIError: HTTP non-2xx (status_code set) or transport
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status = getattr(exc, "status_code", None)
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if status == 429:
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error_type = ErrorType.RATE_LIMITED
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elif status == 404:
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error_type = ErrorType.NOT_FOUND
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elif status is not None:
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error_type = ErrorType.HTTP_ERROR
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else:
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error_type = ErrorType.NETWORK_ERROR
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log.warning("Patreon ingest failed (%s): %s", error_type.value, message)
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return _result(
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success=False, return_code=1,
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error_type=error_type, error_message=message,
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)
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# -- seen-ledger (short-lived sessions) --------------------------------
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def _seen_keys(self, source_id: int, keys: list[str]) -> set[str]:
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"""Which of `keys` are already in the ledger for this source.
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One short SELECT on its own session — opened and closed without any
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network in between (the GETs happen after, in download_post).
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"""
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if not keys:
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return set()
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with self.session_factory() as session:
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rows = session.execute(
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select(PatreonSeenMedia.filehash).where(
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PatreonSeenMedia.source_id == source_id,
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PatreonSeenMedia.filehash.in_(keys),
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)
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).scalars().all()
|
|
return set(rows)
|
|
|
|
def _checkpoint_cursor(self, source_id: int, cursor: str) -> None:
|
|
"""Persist the in-progress backfill cursor mid-walk (plan #705 #6).
|
|
|
|
ATOMIC, single-key UPDATE: cast the JSON column to jsonb, set just
|
|
`_backfill_cursor`, cast back — so it never clobbers operator config or
|
|
the other backfill keys (no read-modify-write race). The in-flight guard
|
|
means only this source's one download runs at a time; a concurrent
|
|
operator stop is benign (a stray cursor with no `_backfill_state` is
|
|
ignored by tick mode and cleared on the next start).
|
|
"""
|
|
with self.session_factory() as session:
|
|
session.execute(
|
|
text(
|
|
"UPDATE source SET config_overrides = jsonb_set("
|
|
" coalesce(config_overrides::jsonb, '{}'::jsonb),"
|
|
" '{_backfill_cursor}', to_jsonb(cast(:cur AS text))"
|
|
")::json WHERE id = :sid"
|
|
),
|
|
{"cur": cursor, "sid": source_id},
|
|
)
|
|
session.commit()
|
|
|
|
def _mark_seen(self, source_id: int, items: list[tuple[str, str]]) -> None:
|
|
"""Idempotent upsert of (filehash, post_id) ledger rows for a page.
|
|
|
|
ON CONFLICT DO NOTHING against the (source_id, filehash) UNIQUE so a
|
|
re-sighting — or a concurrent walk — is a harmless no-op
|
|
([[scalar_one_or_none-duplicates]]: never check-then-insert without the
|
|
DB constraint backing it). De-dup the batch locally first so a single
|
|
page can't present the same key twice to one INSERT.
|
|
"""
|
|
seen_local: set[str] = set()
|
|
values = []
|
|
for key, post_id in items:
|
|
if key in seen_local:
|
|
continue
|
|
seen_local.add(key)
|
|
values.append(
|
|
{"source_id": source_id, "filehash": key, "post_id": post_id}
|
|
)
|
|
if not values:
|
|
return
|
|
with self.session_factory() as session:
|
|
stmt = pg_insert(PatreonSeenMedia).values(values)
|
|
stmt = stmt.on_conflict_do_nothing(
|
|
constraint="uq_patreon_seen_media_source_id"
|
|
)
|
|
session.execute(stmt)
|
|
session.commit()
|
|
|
|
# -- dead-letter ledger (plan #705 #7) ---------------------------------
|
|
|
|
def _dead_keys(self, source_id: int, keys: list[str]) -> set[str]:
|
|
"""Which of `keys` have failed >= DEAD_LETTER_THRESHOLD times (dead).
|
|
One short SELECT; recovery never calls this (it re-attempts dead media)."""
|
|
if not keys:
|
|
return set()
|
|
with self.session_factory() as session:
|
|
rows = session.execute(
|
|
select(PatreonFailedMedia.filehash).where(
|
|
PatreonFailedMedia.source_id == source_id,
|
|
PatreonFailedMedia.filehash.in_(keys),
|
|
PatreonFailedMedia.attempts >= DEAD_LETTER_THRESHOLD,
|
|
)
|
|
).scalars().all()
|
|
return set(rows)
|
|
|
|
def _record_failures(
|
|
self, source_id: int, items: list[tuple[str, str, str]]
|
|
) -> None:
|
|
"""Upsert-increment the dead-letter ledger for failed media. On conflict
|
|
bump `attempts` and refresh last_error/last_failed_at (UNIQUE backs the
|
|
upsert — no check-then-insert, [[scalar_one_or_none-duplicates]]). De-dup
|
|
the batch locally (one row per key, last error wins)."""
|
|
by_key: dict[str, str] = {}
|
|
for key, _post_id, err in items:
|
|
by_key[key] = (err or "")[:_ERROR_MAX]
|
|
if not by_key:
|
|
return
|
|
values = [
|
|
{"source_id": source_id, "filehash": k, "attempts": 1, "last_error": e}
|
|
for k, e in by_key.items()
|
|
]
|
|
with self.session_factory() as session:
|
|
stmt = pg_insert(PatreonFailedMedia).values(values)
|
|
stmt = stmt.on_conflict_do_update(
|
|
constraint="uq_patreon_failed_media_source_id",
|
|
set_={
|
|
"attempts": PatreonFailedMedia.attempts + 1,
|
|
"last_error": stmt.excluded.last_error,
|
|
"last_failed_at": func.now(),
|
|
},
|
|
)
|
|
session.execute(stmt)
|
|
session.commit()
|
|
|
|
def _clear_failures(self, source_id: int, keys: list[str]) -> None:
|
|
"""Drop dead-letter rows for media that just downloaded cleanly — they
|
|
recovered. A no-op DELETE for keys that were never failing."""
|
|
unique = list(dict.fromkeys(keys))
|
|
if not unique:
|
|
return
|
|
with self.session_factory() as session:
|
|
session.execute(
|
|
delete(PatreonFailedMedia).where(
|
|
PatreonFailedMedia.source_id == source_id,
|
|
PatreonFailedMedia.filehash.in_(unique),
|
|
)
|
|
)
|
|
session.commit()
|
|
|
|
|
|
async def verify_patreon_credential(
|
|
url: str,
|
|
cookies_path: str | None,
|
|
overrides: dict | None,
|
|
) -> tuple[bool | None, str]:
|
|
"""Native Patreon credential probe — the verify counterpart to the ingester's
|
|
download path, sharing its campaign-id resolution. Resolves the campaign id
|
|
(override / id: URL / vanity) then does ONE authenticated `/api/posts` fetch
|
|
via PatreonClient.verify_auth. Returns the uniform `(ok, message)` contract
|
|
(True / False / None) so download_backends.verify_credential can treat it
|
|
interchangeably with the gallery-dl probe. No download, no DB.
|
|
"""
|
|
campaign_id, _ = await resolve_campaign_id_for_source(url, cookies_path, overrides)
|
|
if not campaign_id:
|
|
return None, (
|
|
"Couldn't resolve the Patreon campaign id from the source URL — "
|
|
"can't verify (cookies expired, or the creator moved/renamed?)."
|
|
)
|
|
client = PatreonClient(cookies_path)
|
|
loop = asyncio.get_running_loop()
|
|
return await loop.run_in_executor(None, client.verify_auth, campaign_id)
|