PlexKodiConnect/resources/lib/library_sync/full_sync.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
from __future__ import absolute_import, division, unicode_literals
from logging import getLogger
import Queue
import copy

import xbmcgui

from cProfile import Profile
from pstats import Stats
from StringIO import StringIO

from .get_metadata import GetMetadataTask, reset_collections
from . import common, sections
from .. import utils, timing, backgroundthread, variables as v, app
from .. import plex_functions as PF, itemtypes
from ..plex_db import PlexDB

if (v.PLATFORM != 'Microsoft UWP' and
        utils.settings('enablePlaylistSync') == 'true'):
    # Xbox cannot use watchdog, a dependency for PKC playlist features
    from .. import playlists
    PLAYLIST_SYNC_ENABLED = True
else:
    PLAYLIST_SYNC_ENABLED = False

LOG = getLogger('PLEX.sync.full_sync')
# How many items will be put through the processing chain at once?
BATCH_SIZE = 2000
# Safety margin to filter PMS items - how many seconds to look into the past?
UPDATED_AT_SAFETY = 60 * 5
LAST_VIEWED_AT_SAFETY = 60 * 5


def tag_last(iterable):
    """
    Given some iterable, returns (last, item), where last is only True if you
    are on the final iteration.
    """
    iterator = iter(iterable)
    gotone = False
    try:
        lookback = next(iterator)
        gotone = True
        while True:
            cur = next(iterator)
            yield False, lookback
            lookback = cur
    except StopIteration:
        if gotone:
            yield True, lookback
        raise StopIteration()


class InitNewSection(object):
    """
    Throw this into the queue used for ProcessMetadata to tell it which
    Plex library section we're looking at
    """
    def __init__(self, context, total_number_of_items, section_name,
                 section_id, plex_type):
        self.context = context
        self.total = total_number_of_items
        self.name = section_name
        self.id = section_id
        self.plex_type = plex_type


class FullSync(common.libsync_mixin):
    def __init__(self, repair, callback, show_dialog):
        """
        repair=True: force sync EVERY item
        """
        self._canceled = False
        self.repair = repair
        self.callback = callback
        self.queue = None
        self.process_thread = None
        self.current_sync = None
        self.plexdb = None
        self.plex_type = None
        self.section_type = None
        self.worker_count = int(utils.settings('syncThreadNumber'))
        self.item_count = 0
        # For progress dialog
        self.show_dialog = show_dialog
        self.show_dialog_userdata = utils.settings('playstate_sync_indicator') == 'true'
        self.dialog = None
        self.total = 0
        self.current = 0
        self.processed = 0
        self.title = ''
        self.section = None
        self.section_name = None
        self.install_sync_done = utils.settings('SyncInstallRunDone') == 'true'
        self.threader = backgroundthread.ThreaderManager(
            worker=backgroundthread.NonstoppingBackgroundWorker,
            worker_count=self.worker_count)
        super(FullSync, self).__init__()

    def update_progressbar(self):
        if self.show_dialog:
            try:
                progress = int(float(self.current) / float(self.total) * 100.0)
            except ZeroDivisionError:
                progress = 0
            self.dialog.update(progress,
                               '%s (%s)' % (self.section_name, self.section_type_text),
                               '%s/%s %s'
                               % (self.current, self.total, self.title))

    def process_item(self, xml_item):
        """
        Processes a single library item
        """
        plex_id = int(xml_item.get('ratingKey'))
        if not self.repair and self.plexdb.checksum(plex_id, self.plex_type) == \
                int('%s%s' % (plex_id,
                              xml_item.get('updatedAt',
                                           xml_item.get('addedAt', 1541572987)))):
            return
        self.threader.addTask(GetMetadataTask(self.queue,
                                              plex_id,
                                              self.plex_type,
                                              self.get_children))
        self.item_count += 1

    def process_playstate(self, xml_item):
        """
        Processes the playstate of a single library item
        """
        plex_id = int(xml_item.get('ratingKey'))
        if not self.repair and self.plexdb.checksum(plex_id, self.plex_type) == \
                int('%s%s' % (plex_id,
                              xml_item.get('updatedAt',
                                           xml_item.get('addedAt', 1541572987)))):
            return
        self.threader.addTask(GetMetadataTask(self.queue,
                                              plex_id,
                                              self.plex_type,
                                              self.get_children))
        self.item_count += 1

    def update_library(self):
        LOG.debug('Writing changes to Kodi library now')
        i = 0
        if not self.section:
            self.section = self.queue.get()
            self.queue.task_done()
        while not self.isCanceled() and self.item_count > 0:
            section = self.section
            if not section:
                break
            LOG.debug('Start or continue processing section %s (%ss)',
                      section.name, section.plex_type)
            self.processed = 0
            self.total = section.total
            self.section_name = section.name
            self.section_type_text = utils.lang(
                v.TRANSLATION_FROM_PLEXTYPE[section.plex_type])
            with section.context(self.current_sync) as context:
                while not self.isCanceled() and self.item_count > 0:
                    try:
                        item = self.queue.get(block=False)
                    except backgroundthread.Queue.Empty:
                        if self.threader.threader.working():
                            app.APP.monitor.waitForAbort(0.02)
                            continue
                        else:
                            # Try again, in case a thread just finished
                            i += 1
                            if i == 3:
                                break
                            continue
                    i = 0
                    self.queue.task_done()
                    if isinstance(item, dict):
                        context.add_update(item['xml'][0],
                                           section_name=section.name,
                                           section_id=section.id,
                                           children=item['children'])
                        self.title = item['xml'][0].get('title')
                        self.processed += 1
                    elif isinstance(item, InitNewSection) or item is None:
                        self.section = item
                        break
                    else:
                        raise ValueError('Unknown type %s' % type(item))
                    self.item_count -= 1
                    self.current += 1
                    self.update_progressbar()
                    if self.processed == 500:
                        self.processed = 0
                        context.commit()
        LOG.debug('Done writing changes to Kodi library')

    @utils.log_time
    def addupdate_section(self, section):
        LOG.debug('Processing library section for new or changed items %s',
                  section)
        if not self.install_sync_done:
            app.SYNC.path_verified = False
        try:
            # Sync new, updated and deleted items
            iterator = section['iterator']
            # Tell the processing thread about this new section
            queue_info = InitNewSection(section['context'],
                                        iterator.total,
                                        iterator.get('librarySectionTitle'),
                                        section['section_id'],
                                        section['plex_type'])
            self.queue.put(queue_info)
            last = True
            # To keep track of the item-number in order to kill while loops
            self.item_count = 0
            self.current = 0
            while True:
                # Check Plex DB to see what we need to add/update
                with PlexDB() as self.plexdb:
                    for i, (last, xml_item) in enumerate(tag_last(iterator)):
                        if self.isCanceled():
                            return False
                        self.process_item(xml_item)
                        if self.item_count == BATCH_SIZE:
                            break
                # Make sure Plex DB above is closed before adding/updating
                if self.item_count == BATCH_SIZE:
                    self.update_library()
                if last:
                    break
            self.update_library()
            reset_collections()
            return True
        except RuntimeError:
            LOG.error('Could not entirely process section %s', section)
            return False

    @utils.log_time
    def playstate_per_section(self, section):
        LOG.debug('Processing playstate for library section %s', section)
        try:
            # Sync new, updated and deleted items
            iterator = section['iterator']
            # Tell the processing thread about this new section
            queue_info = InitNewSection(section['context'],
                                        iterator.total,
                                        section['section_name'],
                                        section['section_id'],
                                        section['plex_type'])
            self.queue.put(queue_info)
            self.total = iterator.total
            self.section_name = section['section_name']
            self.section_type_text = utils.lang(
                v.TRANSLATION_FROM_PLEXTYPE[section['plex_type']])
            self.current = 0
            with section['context'](self.current_sync) as itemtype:
                for xml_item in iterator:
                    if self.isCanceled():
                        return False
                    itemtype.update_userdata(xml_item, section['plex_type'])
                    itemtype.plexdb.update_last_sync(int(xml_item.attrib['ratingKey']),
                                                     section['plex_type'],
                                                     self.current_sync)
                    self.current += 1
                    self.update_progressbar()
            return True
        except RuntimeError:
            LOG.error('Could not entirely process section %s', section)
            return False

    def threaded_get_iterators(self, kinds, queue, updated_at=None,
                               last_viewed_at=None):
        """
        PF.SectionItems is costly, so let's do it asynchronous
        """
        if self.repair:
            updated_at = None
            last_viewed_at = None
        else:
            updated_at = updated_at - UPDATED_AT_SAFETY if updated_at else None
            last_viewed_at = last_viewed_at - LAST_VIEWED_AT_SAFETY \
                if last_viewed_at else None
        try:
            for kind in kinds:
                for section in (x for x in sections.SECTIONS
                                if x['plex_type'] == kind[1]):
                    if self.isCanceled():
                        return
                    element = copy.deepcopy(section)
                    element['section_type'] = element['plex_type']
                    element['plex_type'] = kind[0]
                    element['element_type'] = kind[1]
                    element['context'] = kind[2]
                    element['get_children'] = kind[3]
                    element['iterator'] = PF.SectionItems(section['section_id'],
                                                          plex_type=kind[0],
                                                          updated_at=updated_at,
                                                          last_viewed_at=last_viewed_at)
                    queue.put(element)
        finally:
            queue.put(None)

    def full_library_sync(self):
        """
        """
        kinds = [
            (v.PLEX_TYPE_MOVIE, v.PLEX_TYPE_MOVIE, itemtypes.Movie, False),
            (v.PLEX_TYPE_SHOW, v.PLEX_TYPE_SHOW, itemtypes.Show, False),
            (v.PLEX_TYPE_SEASON, v.PLEX_TYPE_SHOW, itemtypes.Season, False),
            (v.PLEX_TYPE_EPISODE, v.PLEX_TYPE_SHOW, itemtypes.Episode, False)
        ]
        if app.SYNC.enable_music:
            kinds.extend([
                (v.PLEX_TYPE_ARTIST, v.PLEX_TYPE_ARTIST, itemtypes.Artist, False),
                (v.PLEX_TYPE_ALBUM, v.PLEX_TYPE_ARTIST, itemtypes.Album, True),
            ])
        # ADD NEW ITEMS
        # Already start setting up the iterators. We need to enforce
        # syncing e.g. show before season before episode
        if not self.show_dialog_userdata and self.dialog:
            # Close the progress indicator dialog
            self.dialog.close()
            self.dialog = None
        iterator_queue = Queue.Queue()
        updated_at = int(utils.settings('lastfullsync')) or None
        task = backgroundthread.FunctionAsTask(self.threaded_get_iterators,
                                               None,
                                               kinds,
                                               iterator_queue,
                                               updated_at=updated_at)
        backgroundthread.BGThreader.addTask(task)
        while True:
            section = iterator_queue.get()
            iterator_queue.task_done()
            if section is None:
                break
            # Setup our variables
            self.plex_type = section['plex_type']
            self.section_type = section['section_type']
            self.context = section['context']
            self.get_children = section['get_children']
            # Now do the heavy lifting
            if self.isCanceled() or not self.addupdate_section(section):
                return False
        # SYNC PLAYSTATE of ALL items (otherwise we won't pick up on items that
        # were set to unwatched). Also mark all items on the PMS to be able
        # to delete the ones still in Kodi
        LOG.info('Start synching playstate and userdata for every item')
        task = backgroundthread.FunctionAsTask(self.threaded_get_iterators,
                                               None,
                                               kinds,
                                               iterator_queue)
        backgroundthread.BGThreader.addTask(task)
        while True:
            section = iterator_queue.get()
            iterator_queue.task_done()
            if section is None:
                break
            # Setup our variables
            self.plex_type = section['plex_type']
            self.section_type = section['section_type']
            self.context = section['context']
            self.get_children = section['get_children']
            # Now do the heavy lifting
            if self.isCanceled() or not self.playstate_per_section(section):
                return False
            # Delete movies that are not on Plex anymore
            LOG.info('Looking for items to delete')
            with section['context'](self.current_sync) as context:
                for plex_id in context.plexdb.plex_id_by_last_sync(self.plex_type,
                                                                   self.current_sync):
                    if self.isCanceled():
                        return False
                    context.remove(plex_id, self.plex_type)
            LOG.debug('Done deleting')
        return True

    @utils.log_time
    def run(self):
        profile = Profile()
        profile.enable()
        self.current_sync = timing.plex_now()
        # Delete playlist and video node files from Kodi
        utils.delete_playlists()
        utils.delete_nodes()
        # Get latest Plex libraries and build playlist and video node files
        if not sections.sync_from_pms():
            return
        successful = False
        try:
            self.queue = backgroundthread.Queue.Queue()
            if self.show_dialog:
                self.dialog = xbmcgui.DialogProgressBG()
                self.dialog.create(utils.lang(39714))

            # Actual syncing - do only new items first
            LOG.info('Running full_library_sync with repair=%s',
                     self.repair)
            if not self.full_library_sync():
                return
            if self.isCanceled():
                return
            if PLAYLIST_SYNC_ENABLED and not playlists.full_sync():
                return
            successful = True
        finally:
            common.update_kodi_library(video=True, music=True)
            if self.dialog:
                self.dialog.close()
            self.threader.shutdown()
            if successful:
                utils.settings('lastfullsync', value=str(int(self.current_sync)))
            if self.callback:
                self.callback(successful)
            LOG.info('Done full_sync')
            profile.disable()
            string_io = StringIO()
            stats = Stats(profile, stream=string_io).sort_stats('cumulative')
            stats.print_stats()
            LOG.info('cProfile result: ')
            LOG.info(string_io.getvalue())


def start(show_dialog, repair=False, callback=None):
    """
    """
    # FullSync(repair, callback, show_dialog).start()
    FullSync(repair, callback, show_dialog).run()