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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
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)
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))
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