Vito Sansevero
a33b0f4648
POST /images/thumbnails/plan reviews a move (what is copied, removed and
left, free space, too-long Windows paths, sources no longer listed) and
hands out a token; POST /jobs/thumbnails {mode: move} runs it as a
thumbnails job: hold automatic previews, copy and check every preview on
the job pool, switch with one config commit that records the old copies,
then remove them. Per-file errors still switch; a folder-wide error, a
cancel before the switch or a crash leaves nothing changed (a journal is
undone at the next start); old copies that could not go are removed by a
finishing job at the next start. Leaving a folder removes the previews of
this install's sources that are no longer listed (Q320-8).
Recreate folder and Use this folder answer an unavailable folder; the
Thumbnail maintenance scope prune removes the thumbnails of removed
sources.
524 lines
21 KiB
Python
524 lines
21 KiB
Python
"""Move thumbnails (#320 Part 3): the reviewed job that changes where previews
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live, the removal of old copies after it, recovery at startup and the
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"Remove thumbnails of removed sources" scope (Part 5).
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Kind ``thumbnails`` with ``mode: "move"`` (D1A): admission ``guarded``, so
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scans, deletes, tagging, source changes and every other thumbnail job wait
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for it, while the monitor's Needs review recording runs beside it.
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Automatic previews are held for the whole job (D2A, ``_auto_thumbnail_blocker``).
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Phases: review (``POST /images/thumbnails/plan``, no writes but the
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validation probe), start (a plan token), hold (generation bump, journal,
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target folder), copy (cancellable at every file boundary, on the job pool
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in small chunks, D3A), switch (one config commit sets the location and
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records the old stores under ``cleanup``; not cancellable from here),
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remove old copies, end. Per-file errors switch anyway (D10A); a folder-wide
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error or a cancel before the switch removes what the job wrote and changes
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nothing. The move is the only writer of the setting (D4B).
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Moving away from a thumbnail folder also removes the previews of this
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install's sources that are no longer listed (Q320-8: remove).
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"""
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import functools
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import os
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import time
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from pathlib import Path
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from aiohttp import web
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from . import preview_location, preview_store
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from . import thumbnail_move_files as files
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from .jobs import THUMBNAILS_JOB_KIND
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from .thumbnail_move_plan import (
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MOVE_GROUPS,
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MOVE_TITLE,
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PLAN_TTL,
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_number,
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_plural,
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_remove,
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_roots_revision,
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_volume,
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_is_network,
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_write_json,
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)
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from . import thumbnail_move_plan as move_plan
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try:
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from ...utils import exit_signal
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from ...utils.parallel import map_parallel
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except ImportError: # tests import the package top-level
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from utils import exit_signal
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from utils.parallel import map_parallel
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class ThumbnailMoveMixin:
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"""Start and run the move job; the removal of old copies."""
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# ── start ─────────────────────────────────────────────────────────
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def _take_move_plan(self, body):
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"""The plan a start names, or ``(status, code)``."""
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token = body.get("token")
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plan = (self._move_plans or {}).get(token) if isinstance(token, str) else None
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if plan is None or time.monotonic() - plan.created > PLAN_TTL:
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return 409, "plan-stale"
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roots = [str(root) for root in self._get_all_output_dirs()]
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if _roots_revision(roots) != plan.revision:
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return 409, "plan-stale"
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if preview_store.setting() != plan.old:
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return 409, "plan-stale"
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if plan.confirm_required and body.get("confirmed") is not True:
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return 400, "confirmation-required"
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return plan
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def start_thumbnail_move(self, body):
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"""Start the move job (sync, on the loop); raises JobBusy. Returns
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the job or a refusal response."""
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if not self._move_recovered:
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blocker = self._jobs.active(THUMBNAILS_JOB_KIND)
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return web.json_response(
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{
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"success": False,
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"code": "busy",
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"error": "Prompt Manager is still checking an earlier move. "
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"Try again in a moment.",
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"running": None if blocker is None else {"id": blocker.id},
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},
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status=409,
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)
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taken = self._take_move_plan(body)
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if isinstance(taken, tuple):
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status, code = taken
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text = {
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"plan-stale": "The review is out of date. Review the move again.",
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"confirmation-required": "Confirm that Prompt Manager may "
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"create its folders there.",
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}[code]
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return web.json_response(
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{"success": False, "code": code, "error": text}, status=status
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)
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plan = taken
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self._move_plans.pop(plan.token, None)
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return self._jobs.start(
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THUMBNAILS_JOB_KIND,
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MOVE_TITLE,
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admission="guarded",
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cancellable=True,
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scope={
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"mode": "move",
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"from": plan.old.mode,
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"to": plan.target["mode"],
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"to_path": plan.target["path"],
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},
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groups=MOVE_GROUPS,
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runner=functools.partial(self._run_thumbnail_move, plan=plan),
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)
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# ── the job ───────────────────────────────────────────────────────
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async def _run_thumbnail_move(self, job, *, plan):
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state = {"written": [], "created": [], "created_folder": False}
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try:
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await self._run_in_executor(self._move_hold, job, plan, state)
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except (OSError, ValueError) as error:
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await self._run_in_executor(self._move_rollback, plan, state)
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self._end_move(
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job, "failed", "The new folder could not be made; nothing changed."
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)
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self.logger.warning(f"Move thumbnails could not start: {error}")
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return
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items = [
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(source, item)
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for source in plan.sources
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if source.scan is not None
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for item in source.scan.copy
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]
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total = len(items)
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job.update(total=total, processed=0, progress=0)
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chunk = self._move_chunk(plan)
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workers = self._move_workers()
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done = 0
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for start in range(0, total, chunk):
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if job.cancelled:
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return await self._move_cancelled(job, plan, state)
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batch = items[start : start + chunk]
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try:
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results = await self._run_in_executor(
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map_parallel,
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functools.partial(self._move_copy_one, state=state),
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batch,
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workers,
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)
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except exit_signal.ExitRequested:
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return # exiting: the next start undoes the copies (journal)
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except files.FolderGone as error:
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self.logger.warning(f"Move thumbnails stopped: {error}")
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await self._run_in_executor(self._move_rollback, plan, state)
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self._end_move(
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job,
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"failed",
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"The new folder could not be reached or is full; nothing changed.",
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)
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return
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for (source, item), (outcome, detail) in zip(batch, results):
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row = {
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"path": "/".join(item[0]),
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"root": source.label,
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"detail": detail,
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}
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job.record(
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"moved" if outcome == "moved" else outcome,
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row,
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f"{outcome}: {source.label} · {'/'.join(item[0])}",
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)
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done += len(batch)
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label = batch[-1][0].label
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job.update(
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processed=done,
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progress=int(done * 90 / total) if total else 90,
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status_line=(
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f"Copying {_number(done)} of {_number(total)} previews · {label}"
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),
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)
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job.publish({"type": "progress", "summary": job.summary()})
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if job.cancelled:
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return await self._move_cancelled(job, plan, state)
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# The switch: not cancellable from here (an exit still stops between
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# files and leaves the cleanup to the next start).
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job.cancellable = False
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job.update(status_line="Switching to the new location", progress=92)
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job.publish({"type": "progress", "summary": job.summary()})
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try:
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await self._run_in_executor(self._move_switch, plan)
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except Exception:
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self.logger.exception("Move thumbnails could not switch")
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await self._run_in_executor(self._move_rollback, plan, state)
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self._end_move(
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job, "failed", "The setting could not be saved; nothing changed."
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)
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return
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await self._remove_old_copies(job, plan)
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moved = job.counters.get("moved", 0) + job.counters.get("skipped", 0)
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errors = job.counters.get("errors", 0)
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where = plan.target["path"] or "inside each source"
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parts = [f"{_number(moved)} moved"]
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if errors:
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parts.append(_plural(errors, "error"))
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parts.append(
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"old copies removed"
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if not job.scope.get("cleanup_left")
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else "some old copies are removed at the next start"
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)
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self._end_move(
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job, "finished", f"Thumbnails moved to {where}: " + " · ".join(parts) + "."
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)
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def _end_move(self, job, state, line):
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job.update(status_line=line, progress=100)
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job.log_line(line)
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job.publish({"type": "complete", "summary": job.summary()})
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job.finish(state)
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def _move_workers(self):
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from .images import _worker_threads
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return max(1, int(_worker_threads() or 1))
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def _move_chunk(self, plan):
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"""2 files at a time across volumes or to/from a share, else 4, never
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more than Worker threads (D3A: the pool keeps its size)."""
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sides = [plan.target["path"] or ""] + [s.old_store or "" for s in plan.sources]
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sides += [s.new_store for s in plan.sources]
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network = any(_is_network(side) for side in sides if side)
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volumes = {_volume(side) for side in sides if side}
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size = 2 if network or len(volumes) > 1 else 4
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return max(1, min(size, self._move_workers()))
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def _move_hold(self, job, plan, state):
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"""Phase 3: bump the generation, write the journal, make the target."""
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preview_store.bump_generation()
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if plan.to_folder:
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folder = plan.target["path"]
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if not os.path.isdir(folder):
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if plan.target_default:
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os.makedirs(folder, exist_ok=True)
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else:
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os.mkdir(folder)
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state["created_folder"] = True
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plan.target_id = preview_location.init_folder(
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folder, created_by_pm=state["created_folder"]
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)
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install = plan.install
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def add_keys(marker):
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for source in plan.sources:
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if source.key and source.key not in marker["keys"]:
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marker["keys"][source.key] = {
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"path": source.root,
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"identity": os.path.normcase(os.path.realpath(source.root)),
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"dev_ino": preview_location.file_identity(source.root),
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"install": install,
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}
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with preview_store.write_lock:
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preview_location.write_marker(folder, add_keys)
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_write_json(
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move_plan.journal_path(),
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{
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"state": "copying",
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"from": plan.old.to_config(),
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"to": plan.target,
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"stores": [s.new_store for s in plan.sources],
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# Stores that do not exist yet are made by this job only:
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# after a crash everything in them goes (B4).
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"created_dirs": [
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s.new_store for s in plan.sources if not os.path.isdir(s.new_store)
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],
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"created_folder": state["created_folder"],
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"install": plan.install,
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},
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)
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job.log_line(
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f"Move thumbnails started: {plan.old.path or 'inside each source'} → "
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f"{plan.target['path'] or 'inside each source'}"
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)
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def _move_copy_one(self, pair, *, state):
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"""Copy one preview (a pool thread); ``(group, detail)``."""
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source, (relative, size, mtime_ns) = pair
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destination = Path(source.new_store).joinpath(*relative)
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try:
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if not os.path.isdir(destination.parent):
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base = Path(source.new_store)
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if not base.is_dir():
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if plan_parent_missing(base):
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raise files.FolderGone("the new folder is gone")
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created = []
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files._make_folders(base.parent, (base.name,), created)
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state["created"].extend(created)
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created = []
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files._make_folders(base, relative[:-1], created)
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state["created"].extend(created)
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outcome = files.copy_one(
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Path(source.old_store).joinpath(*relative),
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destination,
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size,
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mtime_ns,
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state["created"],
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)
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except files.CopyFailed as error:
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return "errors", str(error)
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if outcome == "moved":
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state["written"].append(str(destination))
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return "moved", "Copied and checked"
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return "skipped", "Already there"
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async def _move_cancelled(self, job, plan, state):
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if exit_signal.requested():
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return # the next start removes the partial copies (journal)
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await self._run_in_executor(self._move_rollback, plan, state)
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self._end_move(job, "cancelled", "Move cancelled: nothing changed.")
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def _move_rollback(self, plan, state):
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"""Remove what this job wrote (files, folders it made, a folder and
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marker it created) and the journal: nothing changed."""
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for path in state["written"]:
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files.remove_file(path)
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for folder in reversed(state["created"]):
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files.remove_empty_folders(folder)
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if plan.to_folder and state.get("created_folder"):
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folder = plan.target["path"]
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try:
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names = os.listdir(folder)
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except OSError:
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names = None
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if names is not None and set(names) <= {preview_location.MARKER_NAME}:
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_remove(preview_location.marker_path(folder))
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files.remove_empty_folders(folder)
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_remove(move_plan.journal_path())
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def _move_switch(self, plan):
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"""Phase 5: one config commit sets the location and records the old
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stores under ``cleanup``; the runtime follows under the write lock."""
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from ..config import PromptManagerConfig
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from ..config_store import get_config_store
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entry = {
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"from": plan.old.mode,
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"folder": plan.old.path if plan.from_folder else None,
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"stores": [s.old_store for s in plan.sources if s.old_store],
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"drop_keys": self._old_keys_to_drop(plan),
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"install": plan.install,
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}
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# An older entry never removes a store the move just filled (a move
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# back while old copies still waited).
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filled = {os.path.normcase(s.new_store) for s in plan.sources}
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cleanup = []
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for old_entry in plan.old.cleanup:
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stores = [
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store
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for store in old_entry.get("stores") or []
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if isinstance(store, str) and os.path.normcase(store) not in filled
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]
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cleanup.append({**old_entry, "stores": stores})
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cleanup.append(entry)
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if plan.to_folder:
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value = {
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"mode": preview_store.FOLDER_MODE,
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"path": plan.target["path"],
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"id": plan.target_id,
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"install": plan.install,
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"cleanup": cleanup,
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}
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else:
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value = {
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"mode": preview_store.SOURCE_MODE,
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"install": plan.install,
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"cleanup": cleanup,
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}
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def mutate(config):
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section = config.get("thumbnails")
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if not isinstance(section, dict):
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section = {}
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section["location"] = value
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config["thumbnails"] = section
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return config
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def publish(_config):
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PromptManagerConfig.THUMBNAIL_LOCATION = value
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preview_store.configure(value, check=False)
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get_config_store().commit(mutate, expected_revision=None, publish=publish)
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preview_store.refresh()
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_remove(move_plan.journal_path())
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def _old_keys_to_drop(self, plan):
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if not plan.from_folder:
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return []
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keys = [s.old_store and os.path.basename(s.old_store) for s in plan.sources]
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keys = [key for key in keys if key]
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if plan.to_folder and os.path.normcase(plan.old.path or "") == os.path.normcase(
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plan.target["path"] or ""
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):
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return []
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return keys + [key for key, _store, _scan in plan.unlisted]
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async def _remove_old_copies(self, job, plan):
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"""Phase 6: run the cleanup the switch recorded (and earlier ones)."""
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job.update(status_line="Removing old copies", progress=95)
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job.publish({"type": "progress", "summary": job.summary()})
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left = await self._run_in_executor(self._run_cleanup, job)
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if left:
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job.scope["cleanup_left"] = True
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def _run_cleanup(self, job=None):
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"""Remove every recorded old store's previews, temps and empty
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folders; keep in ``cleanup`` what could not go. Returns how many
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entries are left (blocking)."""
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setting = preview_store.setting()
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remaining = []
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for entry in setting.cleanup:
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if not self._cleanup_entry(entry, job):
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remaining.append(entry)
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if list(setting.cleanup) != remaining:
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self._commit_cleanup(remaining)
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return len(remaining)
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def _cleanup_entry(self, entry, job):
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"""One recorded removal; True when it is complete."""
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folder = entry.get("folder")
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stores = [
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store for store in entry.get("stores") or [] if isinstance(store, str)
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]
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if folder:
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if not os.path.isdir(folder):
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return False # the old folder is not reachable: kept for later
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folder_marker = preview_location.read_marker(folder) or {}
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keys = folder_marker.get("keys") or {}
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stores += [
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os.path.join(folder, key)
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for key in entry.get("drop_keys") or []
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if preview_location.valid_key(key) and key in keys
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]
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complete = True
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for store in dict.fromkeys(stores):
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if not self._remove_store(store, folder, job):
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complete = False
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if folder and complete:
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drop = set(entry.get("drop_keys") or [])
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def forget(marker):
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for key in drop:
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marker["keys"].pop(key, None)
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try:
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with preview_store.write_lock:
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marker = preview_location.write_marker(folder, forget)
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except (OSError, ValueError):
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return False
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if not marker["keys"] and marker.get("created_by_pm"):
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names = set(os.listdir(folder))
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rest = {n for n in names if not files.is_os_metadata(n)}
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if rest <= {preview_location.MARKER_NAME}:
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|
_remove(preview_location.marker_path(folder))
|
|
files.remove_empty_folders(folder)
|
|
return complete
|
|
|
|
def _remove_store(self, store, folder, job):
|
|
"""Remove the previews and temps of one old store; True when done."""
|
|
store = Path(store)
|
|
if folder and not preview_location.valid_key(store.name):
|
|
return True
|
|
if not store.exists():
|
|
return True
|
|
if preview_location.is_link_like(store):
|
|
return True # never through a link; nothing of ours there
|
|
complete = True
|
|
removed = 0
|
|
for current, dirs, names in os.walk(store):
|
|
dirs[:] = [
|
|
d for d in dirs if not preview_location.is_link_like(Path(current) / d)
|
|
]
|
|
for name in names:
|
|
path = Path(current) / name
|
|
if files.is_temp_name(name) or files._preview_parts(name):
|
|
if preview_location.is_link_like(path):
|
|
continue
|
|
if files.remove_file(path):
|
|
removed += 1
|
|
else:
|
|
complete = False
|
|
if job is not None:
|
|
job.log_line(
|
|
"In use by another program; removed at the next "
|
|
f"start: {name}"
|
|
)
|
|
files.remove_empty_folders(store)
|
|
if job is not None and removed:
|
|
job.log_line(f"Removed {_number(removed)} old files from {store.name}")
|
|
return complete
|
|
|
|
def _commit_cleanup(self, remaining):
|
|
from ..config import PromptManagerConfig
|
|
from ..config_store import get_config_store
|
|
|
|
def mutate(config):
|
|
section = config.get("thumbnails")
|
|
if isinstance(section, dict) and isinstance(section.get("location"), dict):
|
|
section["location"]["cleanup"] = remaining
|
|
return config
|
|
|
|
def publish(config):
|
|
value = (config.get("thumbnails") or {}).get("location")
|
|
PromptManagerConfig.THUMBNAIL_LOCATION = value
|
|
preview_store.set_cleanup(remaining)
|
|
|
|
get_config_store().commit(mutate, expected_revision=None, publish=publish)
|
|
|
|
|
|
def plan_parent_missing(store):
|
|
"""A key folder's parent (the thumbnail folder) is gone mid-copy."""
|
|
return not Path(store).parent.is_dir()
|