Fix yet another rare but annoying bug where PKC becomes unresponsive during sync

resources/lib/library_sync/fill_metadata_queue.py

@@ -3,7 +3,7 @@ from __future__ import absolute_import, division, unicode_literals
 from logging import getLogger
 from Queue import Empty
 
-from . import common
+from . import common, sections
 from ..plex_db import PlexDB
 from .. import backgroundthread
 
@@ -19,10 +19,12 @@ class FillMetadataQueue(common.LibrarySyncMixin,
     queue. Will use a COPIED plex.db file (plex-copy.db) in order to read much
     faster without the writing thread stalling
     """
-    def __init__(self, repair, section_queue, get_metadata_queue):
+    def __init__(self, repair, section_queue, get_metadata_queue,
+                 processing_queue):
         self.repair = repair
         self.section_queue = section_queue
         self.get_metadata_queue = get_metadata_queue
+        self.processing_queue = processing_queue
         super(FillMetadataQueue, self).__init__()
 
     def _process_section(self, section):
@@ -31,6 +33,7 @@ class FillMetadataQueue(common.LibrarySyncMixin,
         LOG.debug('Process section %s with %s items',
                   section, section.number_of_items)
         count = 0
+        do_process_section = False
         with PlexDB(lock=False, copy=True) as plexdb:
             for xml in section.iterator:
                 if self.should_cancel():
@@ -52,10 +55,14 @@ class FillMetadataQueue(common.LibrarySyncMixin,
                     section.sync_successful = False
                     break
                 count += 1
+                if not do_process_section:
+                    do_process_section = True
+                    self.processing_queue.add_section(section)
+                    LOG.debug('Put section in queue with %s items: %s',
+                              section.number_of_items, section)
         # We might have received LESS items from the PMS than anticipated.
         # Ensures that our queues finish
-        LOG.debug('Expected to process %s items, actually processed %s for '
-                  'section %s', section.number_of_items, count, section)
+        LOG.debug('%s items to process for section %s', count, section)
         section.number_of_items = count
 
     def _run(self):
@@ -67,3 +74,5 @@ class FillMetadataQueue(common.LibrarySyncMixin,
             self._process_section(section)
         # Signal the download metadata threads to stop with a sentinel
         self.get_metadata_queue.put(None)
+        # Sentinel for the process_thread once we added everything else
+        self.processing_queue.add_sentinel(sections.Section())

resources/lib/library_sync/full_sync.py

@@ -83,7 +83,8 @@ class FullSync(common.LibrarySyncMixin, bg.KillableThread):
         get_metadata_queue = Queue.Queue(maxsize=BACKLOG_QUEUE_SIZE)
         scanner_thread = FillMetadataQueue(self.repair,
                                            section_queue,
-                                           get_metadata_queue)
+                                           get_metadata_queue,
+                                           processing_queue)
         scanner_thread.start()
         metadata_threads = [
             GetMetadataThread(get_metadata_queue, processing_queue)
@@ -136,8 +137,7 @@ class FullSync(common.LibrarySyncMixin, bg.KillableThread):
             LOG.error('Could not entirely process section %s', section)
             self.successful = False
 
-    def threaded_get_generators(self, kinds, section_queue, processing_queue,
-                                all_items):
+    def threaded_get_generators(self, kinds, section_queue, all_items):
         """
         Getting iterators is costly, so let's do it in a dedicated thread
         """
@@ -171,7 +171,6 @@ class FullSync(common.LibrarySyncMixin, bg.KillableThread):
                     else:
                         section.number_of_items = section.iterator.total
                         if section.number_of_items > 0:
-                            processing_queue.add_section(section)
                             section_queue.put(section)
                             LOG.debug('Put section in queue with %s items: %s',
                                       section.number_of_items, section)
@@ -180,8 +179,6 @@ class FullSync(common.LibrarySyncMixin, bg.KillableThread):
         finally:
             # Sentinel for the section queue
             section_queue.put(None)
-            # Sentinel for the process_thread once we added everything else
-            processing_queue.add_sentinel(sections.Section())
             LOG.debug('Exiting threaded_get_generators')
 
     def full_library_sync(self):
@@ -202,7 +199,7 @@ class FullSync(common.LibrarySyncMixin, bg.KillableThread):
         # We need to enforce syncing e.g. show before season before episode
         bg.FunctionAsTask(self.threaded_get_generators,
                           None,
-                          kinds, section_queue, processing_queue, False).start()
+                          kinds, section_queue, False).start()
         # Do the heavy lifting
         self.process_new_and_changed_items(section_queue, processing_queue)
         common.update_kodi_library(video=True, music=True)
@@ -236,7 +233,7 @@ class FullSync(common.LibrarySyncMixin, bg.KillableThread):
             self.dialog = None
         bg.FunctionAsTask(self.threaded_get_generators,
                           None,
-                          kinds, section_queue, processing_queue, True).start()
+                          kinds, section_queue, True).start()
         self.processing_loop_playstates(section_queue)
         if self.should_cancel() or not self.successful:
             return