"""FC-3c download orchestrator. Three-phase pipeline: Phase 1 — DB setup (brief session): load source, mark event running, fetch credentials + settings. Phase 2 — Execute (no DB connection): call GalleryDLService; on Patreon campaign-ID failure, resolve vanity and retry once. Phase 3 — Import + persist (fresh session): attach_in_place each written file; clean up duplicates; persist rich metadata. """ from __future__ import annotations import asyncio import logging import re from datetime import UTC, datetime from pathlib import Path from typing import Any from sqlalchemy import select from sqlalchemy.ext.asyncio import AsyncSession from sqlalchemy.orm import Session as SyncSession from sqlalchemy.orm import joinedload from ..models import Artist, DownloadEvent, Source from .credential_service import CredentialService from .gallery_dl import ( BACKFILL_SKIP_VALUE, BACKFILL_TIMEOUT_SECONDS, TICK_SKIP_VALUE, ErrorType, GalleryDLService, SourceConfig, ) from .importer import Importer from .patreon_resolver import resolve_campaign_id from .scheduler_service import set_platform_cooldown log = logging.getLogger(__name__) _PATREON_VANITY_RE = re.compile( r"^https?://(?:www\.)?patreon\.com/(?:c/)?(?!id:)([^/?#]+)", re.IGNORECASE, ) _CAMPAIGN_ID_FAILURE_PATTERN = "failed to extract campaign id" def _extract_patreon_vanity(url: str) -> str | None: m = _PATREON_VANITY_RE.match(url) return m.group(1) if m else None def _looks_like_campaign_id_failure(stdout: str, stderr: str) -> bool: return _CAMPAIGN_ID_FAILURE_PATTERN in f"{stdout}\n{stderr}".lower() def _effective_url(platform: str, source_url: str, overrides: dict) -> str: if platform == "patreon" and overrides.get("patreon_campaign_id"): return f"https://www.patreon.com/id:{overrides['patreon_campaign_id']}" return source_url class DownloadService: """Async orchestrator. The Celery task runs `asyncio.run(svc.download_source(N))`. The Importer is sync (existing FC convention); calls to attach_in_place happen via run_in_executor. """ def __init__( self, async_session: AsyncSession, sync_session: SyncSession, gdl: GalleryDLService, importer: Importer, cred_service: CredentialService, ): self.async_session = async_session self.sync_session = sync_session self.gdl = gdl self.importer = importer self.cred_service = cred_service async def download_source(self, source_id: int) -> int: """Returns DownloadEvent.id. Idempotent: in-flight events are returned as-is.""" setup = await self._phase1_setup(source_id) if setup["status"] in ("skipped", "in_flight"): return setup["event_id"] ctx = setup source_config = SourceConfig.from_dict(ctx["config_overrides"] or {}) # alembic 0031 / plan #544: derive skip_value + timeout from the # source's backfill_runs_remaining counter. When > 0, walk the full # post history (skip: True + 1800s); when 0, exit gallery-dl after # 20 contiguous archived items (skip: "exit:20" + the default # 870s). Operator sets backfill via POST /api/sources/{id}/backfill. backfill_remaining = ctx.get("backfill_runs_remaining", 0) or 0 if backfill_remaining > 0: skip_value: bool | str = BACKFILL_SKIP_VALUE source_config.timeout = BACKFILL_TIMEOUT_SECONDS else: skip_value = TICK_SKIP_VALUE effective_url = _effective_url( ctx["platform"], ctx["url"], ctx["config_overrides"] or {} ) dl_result = await self.gdl.download( url=effective_url, artist_slug=ctx["artist_slug"], platform=ctx["platform"], source_config=source_config, cookies_path=ctx["cookies_path"], auth_token=ctx["auth_token"], skip_value=skip_value, ) resolved_campaign_id: str | None = None if ( ctx["platform"] == "patreon" and not dl_result.success and "patreon_campaign_id" not in (ctx["config_overrides"] or {}) and _looks_like_campaign_id_failure(dl_result.stdout, dl_result.stderr) ): vanity = _extract_patreon_vanity(ctx["url"]) if vanity: log.info( "Attempting campaign-ID resolution for %s (%s)", ctx["artist_slug"], vanity, ) resolved_campaign_id = await resolve_campaign_id( vanity, ctx["cookies_path"] ) if resolved_campaign_id: dl_result = await self.gdl.download( url=f"https://www.patreon.com/id:{resolved_campaign_id}", artist_slug=ctx["artist_slug"], platform=ctx["platform"], source_config=source_config, cookies_path=ctx["cookies_path"], auth_token=ctx["auth_token"], skip_value=skip_value, ) return await self._phase3_persist( ctx["event_id"], ctx, dl_result, resolved_campaign_id, ) async def _phase1_setup(self, source_id: int) -> dict[str, Any]: source = (await self.async_session.execute( select(Source).options(joinedload(Source.artist)).where(Source.id == source_id) )).scalar_one_or_none() if source is None: raise LookupError(f"source {source_id} not found") if not source.enabled: ev = DownloadEvent(source_id=source_id, status="pending") self.async_session.add(ev) await self.async_session.commit() await self.async_session.refresh(ev) await self._finalize_event_and_source( event_id=ev.id, source_id=source_id, status="skipped", error_message="source disabled", ) return {"status": "skipped", "event_id": ev.id} existing = (await self.async_session.execute( select(DownloadEvent).where( DownloadEvent.source_id == source_id, DownloadEvent.status.in_(["pending", "running"]), ).order_by(DownloadEvent.id.desc()).limit(1) )).scalar_one_or_none() if existing and existing.status == "running": return {"status": "in_flight", "event_id": existing.id} if existing and existing.status == "pending": existing.status = "running" await self.async_session.commit() event_id = existing.id else: ev = DownloadEvent(source_id=source_id, status="running") self.async_session.add(ev) await self.async_session.commit() await self.async_session.refresh(ev) event_id = ev.id artist = source.artist if source.platform in ("discord", "pixiv"): cookies_path = None auth_token = await self.cred_service.get_token(source.platform) else: cookies_path_obj = await self.cred_service.get_cookies_path(source.platform) cookies_path = str(cookies_path_obj) if cookies_path_obj else None auth_token = None return { "status": "ok", "event_id": event_id, "source_id": source_id, "url": source.url, "platform": source.platform, "artist_slug": artist.slug if artist else "_unknown", "artist_id": artist.id if artist else None, "config_overrides": dict(source.config_overrides or {}), "cookies_path": cookies_path, "auth_token": auth_token, "backfill_runs_remaining": source.backfill_runs_remaining or 0, } async def _phase3_persist( self, event_id: int, ctx: dict, dl_result, resolved_campaign_id: str | None, ) -> int: # Cache Patreon campaign id on the source. if resolved_campaign_id: src = self.sync_session.get(Source, ctx["source_id"]) if src is not None: src.config_overrides = { **(src.config_overrides or {}), "patreon_campaign_id": resolved_campaign_id, } self.sync_session.commit() artist = None source_row = None if ctx.get("artist_id"): artist = self.sync_session.get(Artist, ctx["artist_id"]) source_row = self.sync_session.get(Source, ctx["source_id"]) import_summary = {"attached": 0, "skipped": 0, "errors": 0} bytes_downloaded = 0 loop = asyncio.get_running_loop() for path_str in dl_result.written_paths or []: if path_str in (dl_result.quarantined_paths or []): continue path = Path(path_str) # Sync stdlib filesystem ops are intentional here: this orchestrator # runs under `asyncio.run` inside a Celery task — no other awaitables # compete for the loop. ASYNC240 suppressed below. if not path.exists(): # noqa: ASYNC240 continue def _attach(p=path): return self.importer.attach_in_place( p, artist=artist, source=source_row, ) result = await loop.run_in_executor(None, _attach) if result.status in ("imported", "superseded"): import_summary["attached"] += 1 try: bytes_downloaded += path.stat().st_size # noqa: ASYNC240 except OSError: pass elif result.status == "skipped" and result.skip_reason and result.skip_reason.value in ( "duplicate_hash", "duplicate_phash", ): import_summary["skipped"] += 1 try: path.unlink(missing_ok=True) # noqa: ASYNC240 except OSError: pass else: import_summary["errors"] += 1 ev = (await self.async_session.execute( select(DownloadEvent).where(DownloadEvent.id == event_id) )).scalar_one() run_stats = self.gdl._compute_run_stats( dl_result.return_code, dl_result.stdout, dl_result.stderr ) run_stats["quarantined_count"] = dl_result.files_quarantined stderr_summary = self.gdl._extract_errors_warnings(dl_result.stderr) # Plan #544: PARTIAL means the run downloaded ≥1 file but the # subprocess didn't finish in budget (typically wall-clock timeout # mid-walk). Real work happened; the next tick continues via # gallery-dl's archive. NOT a failure for status purposes. if dl_result.success and import_summary["errors"] == 0: status = "ok" elif dl_result.error_type == ErrorType.PARTIAL and import_summary["errors"] == 0: status = "ok" else: status = "error" ev.status = status ev.finished_at = datetime.now(UTC) ev.files_count = import_summary["attached"] ev.bytes_downloaded = bytes_downloaded ev.error = dl_result.error_message if status == "error" else None ev.metadata_ = { "run_stats": run_stats, "error_type": dl_result.error_type.value if dl_result.error_type else None, "stdout": self.gdl._truncate_log(dl_result.stdout) or None, "stderr": self.gdl._truncate_log(dl_result.stderr) or None, "stderr_errors_warnings": stderr_summary or None, "duration_seconds": dl_result.duration_seconds, "quarantined_paths": dl_result.quarantined_paths or None, "import_summary": import_summary, } await self._update_source_health( source_id=ctx["source_id"], status=status, error_message=ev.error, error_type=dl_result.error_type.value if dl_result.error_type else None, ) # Plan #544: backfill lifecycle — auto-complete when a clean # backfill run drained the queue (gallery-dl exited 0 + zero files # downloaded means there was nothing to fetch); otherwise decrement # the counter. Next tick falls back to tick mode once it hits 0. backfill_remaining = ctx.get("backfill_runs_remaining", 0) or 0 if backfill_remaining > 0: src = (await self.async_session.execute( select(Source).where(Source.id == ctx["source_id"]) )).scalar_one() if dl_result.return_code == 0 and dl_result.files_downloaded == 0: src.backfill_runs_remaining = 0 else: src.backfill_runs_remaining = max(0, backfill_remaining - 1) await self.async_session.commit() return event_id async def _update_source_health( self, *, source_id: int, status: str, error_message: str | None, error_type: str | None = None, ) -> None: """FC-3d: update Source.{consecutive_failures, last_error, last_checked_at}. ok -> failures = 0, error = None, checked_at = now error -> failures += 1, error = error_message, checked_at = now skipped -> failures unchanged, error = None, checked_at = now When error_type == 'rate_limited', also stamps a platform-wide cooldown via scheduler_service.set_platform_cooldown so the next scan tick skips every source on this platform until the cooldown expires. Preventive half of the burst-prevention pair — consecutive_failures still backs the offending source off across ticks. """ source = (await self.async_session.execute( select(Source).where(Source.id == source_id) )).scalar_one() now = datetime.now(UTC) if status == "ok": source.consecutive_failures = 0 source.last_error = None elif status == "error": source.consecutive_failures = (source.consecutive_failures or 0) + 1 source.last_error = error_message if error_type == "rate_limited": await set_platform_cooldown(self.async_session, source.platform) elif status == "skipped": source.last_error = None source.last_checked_at = now async def _finalize_event_and_source( self, *, event_id: int, source_id: int, status: str, error_message: str | None, ) -> None: """Finalize the event AND the source-health columns in one transactional step. Used by the skipped early-out path and by unit tests that exercise the source-health writes directly. """ ev = (await self.async_session.execute( select(DownloadEvent).where(DownloadEvent.id == event_id) )).scalar_one() ev.status = status ev.finished_at = datetime.now(UTC) ev.error = error_message await self._update_source_health( source_id=source_id, status=status, error_message=error_message, ) await self.async_session.commit()