import os import os.path import sys from datetime import datetime from PhotoAlbum import Photo, Album, PhotoAlbumEncoder from CachePath import json_cache, set_cache_path_base, file_mtime import json class TreeWalker: def __init__(self, album_path, cache_path): self.album_path = os.path.abspath(album_path) self.cache_path = os.path.abspath(cache_path) set_cache_path_base(self.album_path) self.all_albums = list() self.all_photos = list() self.walk(self.album_path) self.big_lists() self.remove_stale() def walk(self, path): print "Walking %s" % path cache = os.path.join(self.cache_path, json_cache(path)) cached = False cached_album = None if os.path.exists(cache): print "Has cache %s" % path try: cached_album = Album.from_cache(cache) if file_mtime(path) <= file_mtime(cache): print "Album is fully cached" cached = True album = cached_album for photo in album.photos: self.all_photos.append(photo) except: print "Cache is corrupted. Rescanning album." cached_album = None if not cached: album = Album(path) for entry in os.listdir(path): if entry[0] == '.': continue try: entry = entry.decode(sys.getfilesystemencoding()) except: pass entry = os.path.join(path, entry) if os.path.isdir(entry): album.add_album(self.walk(entry)) elif not cached and os.path.isfile(entry): cache_hit = False if cached_album: cached_photo = cached_album.photo_from_path(entry) if cached_photo and file_mtime(entry) <= cached_photo.attributes["dateTimeFile"]: print "Photo cache hit %s" % entry cache_hit = True photo = cached_photo if not cache_hit: print "No cache, scanning %s" % entry photo = Photo(entry, self.cache_path) if photo.is_valid: self.all_photos.append(photo) album.add_photo(photo) if not album.empty: print "Writing cache of %s" % album.cache_path album.cache(self.cache_path) self.all_albums.append(album) else: print "Not writing cache of %s because it's empty" % album.cache_path return album def big_lists(self): photo_list = [] self.all_photos.sort() for photo in self.all_photos: photo_list.append(photo.path) print "Writing all photos list." fp = open(os.path.join(self.cache_path, "all_photos.json"), 'w') json.dump(photo_list, fp, cls=PhotoAlbumEncoder) fp.close() photo_list.reverse() print "Writing latest photos list." fp = open(os.path.join(self.cache_path, "latest_photos.json"), 'w') json.dump(photo_list[0:27], fp, cls=PhotoAlbumEncoder) fp.close() def remove_stale(self): print "Building list of all cache entries." all_cache_entries = { "all_photos.json": True, "latest_photos.json": True } for album in self.all_albums: all_cache_entries[album.cache_path] = True for photo in self.all_photos: for entry in photo.image_caches: all_cache_entries[entry] = True print "Searching stale cache entries." for cache in os.listdir(self.cache_path): try: cache = cache.decode(sys.getfilesystemencoding()) except: pass if cache not in all_cache_entries: print "Removing stale cache %s" % cache os.unlink(os.path.join(self.cache_path, cache))