Fix to correctly wipe Kodi databases

resources/lib/db.py

@@ -52,21 +52,25 @@ def catch_operationalerrors(method):
     return wrapper
 
 
-def _initial_db_connection_setup(conn):
+def _initial_db_connection_setup(conn, wal_mode):
     """
     Set-up DB e.g. for WAL journal mode, if that hasn't already been done
     before. Also start a transaction
     """
+    if wal_mode:
         conn.execute('PRAGMA journal_mode=WAL;')
         conn.execute('PRAGMA cache_size = -8000;')
         conn.execute('PRAGMA synchronous=NORMAL;')
     conn.execute('BEGIN')
 
 
-def connect(media_type=None):
+def connect(media_type=None, wal_mode=True):
     """
     Open a connection to the Kodi database.
         media_type: 'video' (standard if not passed), 'plex', 'music', 'texture'
+    Pass wal_mode=False if you want the standard (and slower) sqlite
+    journal_mode, e.g. when wiping entire tables. Useful if you do NOT want
+    concurrent access to DB for both PKC and Kodi
     """
     if media_type == "plex":
         db_path = v.DB_PLEX_PATH
@@ -80,7 +84,7 @@ def connect(media_type=None):
     attempts = DB_WRITE_ATTEMPTS
     while True:
         try:
-            _initial_db_connection_setup(conn)
+            _initial_db_connection_setup(conn, wal_mode)
         except sqlite3.OperationalError as err:
             if 'database is locked' not in err:
                 # Not an error we want to catch, so reraise it

resources/lib/kodi_db/__init__.py

@@ -61,7 +61,10 @@ def setup_kodi_default_entries():
 
 def reset_cached_images():
     LOG.info('Resetting cached artwork')
-    # Remove all existing textures first
+    LOG.debug('Resetting the Kodi texture DB')
+    with KodiTextureDB(wal_mode=False) as kodidb:
+        kodidb.wipe()
+    LOG.debug('Deleting all cached image files')
     path = path_ops.translate_path('special://thumbnails/')
     if path_ops.exists(path):
         path_ops.rmtree(path, ignore_errors=True)
@@ -72,10 +75,10 @@ def reset_cached_images():
             new_path = path_ops.translate_path('special://thumbnails/%s' % path)
             try:
                 path_ops.makedirs(path_ops.encode_path(new_path))
-            except OSError:
-                pass
-    with KodiTextureDB() as kodidb:
-        kodidb.reset_cached_images()
+            except OSError as err:
+                LOG.warn('Could not create thumbnail directory %s: %s',
+                         new_path, err)
+    LOG.info('Done resetting cached artwork')
 
 
 def wipe_dbs(music=True):
@@ -83,16 +86,18 @@ def wipe_dbs(music=True):
     Completely resets the Kodi databases 'video', 'texture' and 'music' (if
     music sync is enabled)
 
-    DO NOT use context menu as we need to connect without WAL mode - if Kodi
-    is still accessing the DB
+    We need to connect without sqlite WAL mode as Kodi might still be accessing
+    the dbs and we need to prevent that
     """
     LOG.warn('Wiping Kodi databases!')
-    kinds = [KodiVideoDB, KodiTextureDB]
-    if music:
-        kinds.insert(1, KodiMusicDB)
-    for kind in kinds:
-        with kind() as kodidb:
+    LOG.info('Wiping Kodi video database')
+    with KodiVideoDB(wal_mode=False) as kodidb:
         kodidb.wipe()
+    if music:
+        LOG.info('Wiping Kodi music database')
+        with KodiMusicDB(wal_mode=False) as kodidb:
+            kodidb.wipe()
+    reset_cached_images()
     setup_kodi_default_entries()
     # Delete SQLITE wal files
     import xbmc

resources/lib/kodi_db/common.py

@@ -14,9 +14,12 @@ class KodiDBBase(object):
     """
     Kodi database methods used for all types of items
     """
-    def __init__(self, texture_db=False, kodiconn=None, artconn=None, lock=True):
+    def __init__(self, texture_db=False, kodiconn=None, artconn=None,
+                 lock=True, wal_mode=True):
         """
         Allows direct use with a cursor instead of context mgr
+        Pass wal_mode=False if you want the standard sqlite journal_mode, e.g.
+        when wiping entire tables
         """
         self._texture_db = texture_db
         self.lock = lock
@@ -24,13 +27,15 @@ class KodiDBBase(object):
         self.cursor = self.kodiconn.cursor() if self.kodiconn else None
         self.artconn = artconn
         self.artcursor = self.artconn.cursor() if self.artconn else None
+        self.wal_mode = wal_mode
 
     def __enter__(self):
         if self.lock:
             KODIDB_LOCK.acquire()
-        self.kodiconn = db.connect(self.db_kind)
+        self.kodiconn = db.connect(self.db_kind, self.wal_mode)
         self.cursor = self.kodiconn.cursor()
-        self.artconn = db.connect('texture') if self._texture_db else None
+        self.artconn = db.connect('texture', self.wal_mode) if self._texture_db \
+            else None
         self.artcursor = self.artconn.cursor() if self._texture_db else None
         return self
 

resources/lib/kodi_db/texture.py

@@ -3,7 +3,6 @@
 from __future__ import absolute_import, division, unicode_literals
 
 from . import common
-from .. import db
 
 
 class KodiTextureDB(common.KodiDBBase):
@@ -16,11 +15,3 @@ class KodiTextureDB(common.KodiDBBase):
         self.artcursor.execute('SELECT url FROM texture WHERE url = ? LIMIT 1',
                                (url, ))
         return self.artcursor.fetchone() is None
-
-    @db.catch_operationalerrors
-    def reset_cached_images(self):
-        for row in self.cursor.execute('SELECT tbl_name '
-                                       'FROM sqlite_master WHERE type=?',
-                                       ('table', )):
-            if row[0] != 'version':
-                self.cursor.execute("DELETE FROM %s" % row[0])

resources/lib/utils.py

@@ -573,12 +573,10 @@ def wipe_database(reboot=True):
         # Plex DB completely empty yet. Wipe existing Kodi music only if we
         # expect to sync Plex music
         music = settings('enableMusic') == 'true'
+    LOG.info("Resetting all cached artwork.")
     kodi_db.wipe_dbs(music)
     plex_db.wipe()
 
-    LOG.info("Resetting all cached artwork.")
-    # Remove all cached artwork
-    kodi_db.reset_cached_images()
     # reset the install run flag
     settings('SyncInstallRunDone', value="false")
     settings('sections_asked_for_machine_identifier', value='')