Allow for UI updates as the library is being sync'ed

Periodically release the locks on the database as the sync with the
server is being performed. This allows the UI to communicate with its
database and update the UI in real time.

Taken this oppurtunity to refactor some common code improve
maintainance.

jellyfin_kodi/full_sync.py

@@ -3,6 +3,7 @@ from __future__ import division, absolute_import, print_function, unicode_litera
 
 ##################################################################################################
 
+from contextlib import contextmanager
 import datetime
 import logging
 
@@ -248,6 +249,13 @@ class FullSync(object):
 
             raise
 
+    @contextmanager
+    def video_database_locks(self):
+        with self.library.database_lock:
+            with Database() as videodb:
+                with Database('jellyfin') as jellyfindb:
+                    yield videodb, jellyfindb
+
     @progress()
     def movies(self, library, dialog):
 
@@ -255,14 +263,11 @@ class FullSync(object):
         '''
         Movies = self.library.media['Movies']
 
-        with self.library.database_lock:
-            with Database() as videodb:
-                with Database('jellyfin') as jellyfindb:
-
-                    obj = Movies(self.server, jellyfindb, videodb, self.direct_path)
-
         for items in server.get_items(library['Id'], "Movie", False, self.sync['RestorePoint'].get('params')):
 
+            with self.video_database_locks() as (videodb, jellyfindb):
+                obj = Movies(self.server, jellyfindb, videodb, self.direct_path)
+
                 self.sync['RestorePoint'] = items['RestorePoint']
                 start_index = items['RestorePoint']['params']['StartIndex']
 
@@ -273,6 +278,9 @@ class FullSync(object):
                                   message=movie['Name'])
                     obj.movie(movie, library=library)
 
+        with self.video_database_locks() as (videodb, jellyfindb):
+            obj = Movies(self.server, jellyfindb, videodb, self.direct_path)
+
             if self.update_library:
                 self.movies_compare(library, obj, jellyfindb)
 
@@ -296,13 +304,11 @@ class FullSync(object):
         '''
         TVShows = self.library.media['TVShows']
 
-        with self.library.database_lock:
-            with Database() as videodb:
-                with Database('jellyfin') as jellyfindb:
-                    obj = TVShows(self.server, jellyfindb, videodb, self.direct_path, True)
-
         for items in server.get_items(library['Id'], "Series", False, self.sync['RestorePoint'].get('params')):
 
+            with self.video_database_locks() as (videodb, jellyfindb):
+                obj = TVShows(self.server, jellyfindb, videodb, self.direct_path, True)
+
                 self.sync['RestorePoint'] = items['RestorePoint']
                 start_index = items['RestorePoint']['params']['StartIndex']
 
@@ -320,6 +326,8 @@ class FullSync(object):
                                 dialog.update(percent, message="%s/%s" % (message, episode['Name'][:10]))
                                 obj.episode(episode)
 
+        with self.video_database_locks() as (videodb, jellyfindb):
+            obj = TVShows(self.server, jellyfindb, videodb, self.direct_path, True)
             if self.update_library:
                 self.tvshows_compare(library, obj, jellyfindb)
 
@@ -346,13 +354,11 @@ class FullSync(object):
         '''
         MusicVideos = self.library.media['MusicVideos']
 
-        with self.library.database_lock:
-            with Database() as videodb:
-                with Database('jellyfin') as jellyfindb:
-                    obj = MusicVideos(self.server, jellyfindb, videodb, self.direct_path)
-
         for items in server.get_items(library['Id'], "MusicVideo", False, self.sync['RestorePoint'].get('params')):
 
+            with self.video_database_locks() as (videodb, jellyfindb):
+                obj = MusicVideos(self.server, jellyfindb, videodb, self.direct_path)
+
                 self.sync['RestorePoint'] = items['RestorePoint']
                 start_index = items['RestorePoint']['params']['StartIndex']
 
@@ -363,6 +369,8 @@ class FullSync(object):
                                   message=mvideo['Name'])
                     obj.musicvideo(mvideo, library=library)
 
+        with self.video_database_locks() as (videodb, jellyfindb):
+            obj = MusicVideos(self.server, jellyfindb, videodb, self.direct_path)
             if self.update_library:
                 self.musicvideos_compare(library, obj, jellyfindb)
 
@@ -447,13 +455,11 @@ class FullSync(object):
         '''
         Movies = self.library.media['Movies']
 
-        with self.library.database_lock:
-            with Database() as videodb:
-                with Database('jellyfin') as jellyfindb:
-                    obj = Movies(self.server, jellyfindb, videodb, self.direct_path)
-
         for items in server.get_items(library_id, "BoxSet", False, self.sync['RestorePoint'].get('params')):
 
+            with self.video_database_locks() as (videodb, jellyfindb):
+                obj = Movies(self.server, jellyfindb, videodb, self.direct_path)
+
                 self.sync['RestorePoint'] = items['RestorePoint']
                 start_index = items['RestorePoint']['params']['StartIndex']
 
@@ -470,10 +476,7 @@ class FullSync(object):
         '''
         Movies = self.library.media['Movies']
 
-        with self.library.database_lock:
+        with self.video_database_locks() as (videodb, jellyfindb):
-            with Database() as videodb:
-                with Database('jellyfin') as jellyfindb:
-
             obj = Movies(self.server, jellyfindb, videodb, self.direct_path)
             obj.boxsets_reset()