367 lines
15 KiB
Python
367 lines
15 KiB
Python
"""
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file_watcher.py — Overvåger musikbiblioteker og holder SQLite opdateret.
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Bruger watchdog til at reagere på fil-ændringer i realtid.
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Kører fuld scan ved opstart for at fange ændringer lavet mens appen var lukket.
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"""
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import threading
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import time
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import logging
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from pathlib import Path
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from typing import Callable
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try:
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from watchdog.observers import Observer
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from watchdog.events import (
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FileSystemEventHandler,
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FileCreatedEvent,
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FileModifiedEvent,
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FileDeletedEvent,
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FileMovedEvent,
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)
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WATCHDOG_AVAILABLE = True
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except ImportError:
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WATCHDOG_AVAILABLE = False
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print("Advarsel: watchdog ikke installeret — fil-overvågning deaktiveret")
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from local.tag_reader import is_supported, read_tags, get_file_modified_at
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from local.local_db import (
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get_libraries, add_library, remove_library,
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upsert_song, mark_song_missing,
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get_all_song_paths_for_library, update_library_scan_time,
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)
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logger = logging.getLogger(__name__)
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class MusicLibraryHandler(FileSystemEventHandler):
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"""
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Reagerer på ændringer i et musikbibliotek.
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Kører i watchdog's baggrundstråd — DB-operationer er thread-safe via WAL.
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"""
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def __init__(self, library_id: int, on_change: Callable | None = None):
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self.library_id = library_id
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self.on_change = on_change # valgfrit callback til GUI-opdatering
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self._debounce: dict[str, float] = {}
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self._debounce_lock = threading.Lock()
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def _debounced(self, path: str) -> bool:
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"""
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Forhindrer at samme fil behandles flere gange på kort tid.
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Nogle programmer gemmer filer i flere trin (temp-fil → rename).
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"""
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now = time.time()
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with self._debounce_lock:
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last = self._debounce.get(path, 0)
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if now - last < 1.5: # 1.5 sekunder cooldown
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return False
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self._debounce[path] = now
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return True
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def on_created(self, event):
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if event.is_directory or not is_supported(event.src_path):
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return
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if self._debounced(event.src_path):
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self._process_file(event.src_path)
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def on_modified(self, event):
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if event.is_directory or not is_supported(event.src_path):
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return
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if self._debounced(event.src_path):
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self._process_file(event.src_path)
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def on_deleted(self, event):
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if event.is_directory or not is_supported(event.src_path):
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return
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logger.info(f"Fil slettet: {event.src_path}")
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mark_song_missing(event.src_path)
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if self.on_change:
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self.on_change("deleted", event.src_path, None)
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def on_moved(self, event):
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if event.is_directory:
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return
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# Behandl som slet + opret
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if is_supported(event.src_path):
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mark_song_missing(event.src_path)
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if is_supported(event.dest_path):
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if self._debounced(event.dest_path):
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self._process_file(event.dest_path)
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def _process_file(self, path: str):
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"""Læs tags og gem i SQLite."""
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try:
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logger.debug(f"Høster tags fra: {path}")
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tags = read_tags(path)
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tags["library_id"] = self.library_id
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song_id = upsert_song(tags)
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logger.info(f"Opdateret: {Path(path).name} ({len(tags.get('dances', []))} danse)")
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if self.on_change:
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self.on_change("upserted", path, song_id)
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except Exception as e:
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logger.error(f"Fejl ved behandling af {path}: {e}")
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class LibraryWatcher:
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"""
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Styrer watchdog-observere for alle aktive musikbiblioteker.
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Én instans per applikation.
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"""
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def __init__(self, on_change: Callable | None = None):
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self.on_change = on_change
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self._observer: Observer | None = None
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self._running = False
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def start(self):
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"""Start overvågning af alle aktive biblioteker + kør fuld scan."""
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if not WATCHDOG_AVAILABLE:
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logger.warning("watchdog ikke tilgængelig — starter kun fuld scan")
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self._full_scan_all()
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return
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self._observer = Observer()
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libraries = get_libraries(active_only=True)
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for lib in libraries:
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path = Path(lib["path"])
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if not path.exists():
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logger.warning(f"Bibliotek findes ikke: {path}")
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continue
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handler = MusicLibraryHandler(lib["id"], self.on_change)
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self._observer.schedule(handler, str(path), recursive=True)
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logger.info(f"Overvåger: {path}")
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self._observer.start()
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self._running = True
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# Fuld scan i baggrundstråd så GUI ikke blokeres
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threading.Thread(target=self._full_scan_all, daemon=True).start()
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def stop(self):
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if self._observer and self._running:
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self._observer.stop()
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self._observer.join()
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self._running = False
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def add_library(self, path: str) -> int:
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"""Tilføj et nyt bibliotek — alt kører i baggrundstråd."""
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library_id = add_library(path)
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def _bg(lib_id, lib_path):
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# Registrer watchdog — kan blokere lidt på Windows med mange filer
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if self._observer and self._running:
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try:
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handler = MusicLibraryHandler(lib_id, self.on_change)
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self._observer.schedule(handler, lib_path, recursive=True)
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except Exception as e:
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logger.error(f"Watchdog schedule fejl: {e}")
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# Scan
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self._full_scan_library(lib_id, lib_path)
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t = threading.Thread(target=_bg, args=(library_id, path), daemon=True)
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t.start()
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return library_id
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def remove_library(self, library_id: int):
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"""Deaktiver bibliotek. Watchdog stopper automatisk ved næste restart."""
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remove_library(library_id)
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# Genstart observer for at fjerne watch (watchdog understøtter ikke unschedule by id)
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if self._observer and self._running:
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self._observer.unschedule_all()
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self._reschedule_all()
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def _reschedule_all(self):
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"""Genplanlæg alle aktive biblioteker på observeren."""
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for lib in get_libraries(active_only=True):
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path = Path(lib["path"])
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if path.exists():
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handler = MusicLibraryHandler(lib["id"], self.on_change)
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self._observer.schedule(handler, str(path), recursive=True)
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def _full_scan_all(self):
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"""Kør fuld scan på alle aktive biblioteker — i baggrundstråde."""
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for lib in get_libraries(active_only=True):
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path = Path(lib["path"])
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if path.exists():
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t = threading.Thread(
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target=self._full_scan_library,
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args=(lib["id"], str(path)),
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daemon=True
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)
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t.start()
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def _full_scan_library(self, library_id: int, library_path: str):
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"""Scan ét bibliotek med sin egen SQLite-forbindelse — blokerer aldrig GUI."""
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import sqlite3, uuid, json, os
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from local.local_db import DB_PATH
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from local.tag_reader import read_tags, is_supported, get_file_modified_at
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logger.info(f"Fuld scan starter: {library_path}")
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base = Path(library_path)
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if not self._path_accessible(base):
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logger.warning(f"Bibliotek ikke tilgængeligt: {library_path}")
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return
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try:
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conn = sqlite3.connect(str(DB_PATH))
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conn.row_factory = sqlite3.Row
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# Hent kendte stier og modified-tider
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known = {
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row["local_path"]: row["file_modified_at"]
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for row in conn.execute(
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"SELECT local_path, file_modified_at FROM songs WHERE library_id=?",
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(library_id,)
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).fetchall()
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}
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found_paths = set()
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processed = 0
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for dirpath, _, filenames in os.walk(str(base), followlinks=False):
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for filename in filenames:
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file_path = Path(dirpath) / filename
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if not is_supported(file_path):
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continue
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path_str = str(file_path)
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found_paths.add(path_str)
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try:
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disk_modified = get_file_modified_at(file_path)
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if path_str in known and known[path_str] == disk_modified:
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continue # uændret — skip
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tags = read_tags(file_path)
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extra = json.dumps(tags.get("extra_tags", {}), ensure_ascii=False)
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existing = conn.execute(
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"SELECT id FROM songs WHERE local_path=?", (path_str,)
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).fetchone()
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if existing:
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song_id = existing["id"]
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conn.execute("""
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UPDATE songs SET library_id=?, title=?, artist=?,
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album=?, bpm=?, duration_sec=?, file_format=?,
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file_modified_at=?, file_missing=0, extra_tags=?
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WHERE id=?
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""", (library_id, tags.get("title",""), tags.get("artist",""),
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tags.get("album",""), tags.get("bpm",0),
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tags.get("duration_sec",0), tags.get("file_format",""),
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disk_modified, extra, song_id))
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else:
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song_id = str(uuid.uuid4())
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conn.execute("""
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INSERT INTO songs (id, library_id, local_path, title,
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artist, album, bpm, duration_sec, file_format,
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file_modified_at, extra_tags)
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VALUES (?,?,?,?,?,?,?,?,?,?,?)
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""", (song_id, library_id, path_str,
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tags.get("title",""), tags.get("artist",""),
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tags.get("album",""), tags.get("bpm",0),
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tags.get("duration_sec",0), tags.get("file_format",""),
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disk_modified, extra))
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# Danse fra fil — merge med eksisterende niveau
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file_dances = tags.get("dances", [])
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if file_dances:
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existing_dances = {
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row["name"].lower(): row
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for row in conn.execute("""
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SELECT d.id, d.name, sd.dance_order
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FROM song_dances sd JOIN dances d ON d.id=sd.dance_id
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WHERE sd.song_id=?
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""", (song_id,)).fetchall()
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}
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for i, dance_name in enumerate(file_dances, 1):
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if not dance_name:
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continue
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name_lower = dance_name.lower()
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if name_lower in existing_dances:
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conn.execute(
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"UPDATE song_dances SET dance_order=? "
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"WHERE song_id=? AND dance_id=?",
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(i, song_id, existing_dances[name_lower]["id"])
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)
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else:
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# Opret dans uden niveau
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d = conn.execute(
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"SELECT id FROM dances WHERE name=? COLLATE NOCASE "
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"AND level_id IS NULL", (dance_name,)
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).fetchone()
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if not d:
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conn.execute(
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"INSERT INTO dances (name, level_id, source) "
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"VALUES (?,NULL,'local')", (dance_name,)
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)
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d = conn.execute(
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"SELECT id FROM dances WHERE name=? COLLATE NOCASE "
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"AND level_id IS NULL", (dance_name,)
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).fetchone()
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conn.execute(
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"INSERT OR IGNORE INTO song_dances "
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"(song_id, dance_id, dance_order) VALUES (?,?,?)",
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(song_id, d["id"], i)
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)
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conn.commit()
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processed += 1
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if self.on_change:
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self.on_change("upserted", path_str, song_id)
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except Exception as e:
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logger.error(f"Scan-fejl for {file_path}: {e}")
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# Markér forsvundne filer
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for known_path in known:
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if known_path not in found_paths:
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conn.execute(
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"UPDATE songs SET file_missing=1 WHERE local_path=?",
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(known_path,)
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)
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conn.commit()
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if self.on_change:
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self.on_change("deleted", known_path, None)
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conn.execute(
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"UPDATE libraries SET last_full_scan=datetime('now') WHERE id=?",
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(library_id,)
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)
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conn.commit()
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conn.close()
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logger.info(f"Scan færdig: {library_path} — {processed} opdateret")
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except Exception as e:
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logger.error(f"Scan fejl: {library_path}: {e}")
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def _path_accessible(self, path: Path, timeout_sec: float = 5.0) -> bool:
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"""Tjek om en sti er tilgængelig inden for timeout."""
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import threading
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result = [False]
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def check():
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try:
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result[0] = path.exists() and path.is_dir()
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except Exception:
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result[0] = False
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t = threading.Thread(target=check, daemon=True)
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t.start()
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t.join(timeout=timeout_sec)
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return result[0]
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# ── Singleton til brug i appen ────────────────────────────────────────────────
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_watcher: LibraryWatcher | None = None
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def get_watcher(on_change: Callable | None = None) -> LibraryWatcher:
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"""Returnerer den globale LibraryWatcher-instans."""
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global _watcher
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if _watcher is None:
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_watcher = LibraryWatcher(on_change=on_change)
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return _watcher
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