Merge remote-tracking branch 'cover_images/thumbnails' into cover_thumbnail

# Conflicts:
#	cps/admin.py
#	cps/config_sql.py
#	cps/helper.py
#	cps/tasks/upload.py
#	cps/updater.py
#	cps/web.py

.gitignore

@@ -23,6 +23,7 @@ vendor/
 # calibre-web
 *.db
 *.log
+cps/cache
 
 .idea/
 *.bak

cps.py

@@ -44,6 +44,7 @@ from cps.editbooks import editbook
 from cps.remotelogin import remotelogin
 from cps.search_metadata import meta
 from cps.error_handler import init_errorhandler
+from cps.schedule import register_scheduled_tasks, register_startup_tasks
 
 try:
     from cps.kobo import kobo, get_kobo_activated
@@ -79,6 +80,11 @@ def main():
         app.register_blueprint(kobo_auth)
     if oauth_available:
         app.register_blueprint(oauth)
+
+    # Register scheduled tasks
+    register_scheduled_tasks()
+    register_startup_tasks()
+
     success = web_server.start()
     sys.exit(0 if success else 1)
 

cps/__init__.py

@@ -159,6 +159,7 @@ def create_app():
     config.store_calibre_uuid(calibre_db, db.Library_Id)
     return app
 
+
 @babel.localeselector
 def get_locale():
     # if a user is logged in, use the locale from the user settings

cps/admin.py

@@ -40,11 +40,13 @@ from sqlalchemy.exc import IntegrityError, OperationalError, InvalidRequestError
 from sqlalchemy.sql.expression import func, or_, text
 
 from . import constants, logger, helper, services, cli
-from . import db, calibre_db, ub, web_server, get_locale, config, updater_thread, babel, gdriveutils, kobo_sync_status
+from . import db, calibre_db, ub, web_server, get_locale, config, updater_thread, babel, gdriveutils, \
+    kobo_sync_status, schedule
 from .helper import check_valid_domain, send_test_mail, reset_password, generate_password_hash, check_email, \
     valid_email, check_username
 from .gdriveutils import is_gdrive_ready, gdrive_support
 from .render_template import render_title_template, get_sidebar_config
+from .services.worker import WorkerThread
 from . import debug_info, _BABEL_TRANSLATIONS
 
 from functools import wraps
@@ -1635,6 +1637,45 @@ def update_mailsettings():
     return edit_mailsettings()
 
 
+@admi.route("/admin/scheduledtasks")
+@login_required
+@admin_required
+def edit_scheduledtasks():
+    content = config.get_scheduled_task_settings()
+    return render_title_template("schedule_edit.html", config=content, title=_(u"Edit Scheduled Tasks Settings"))
+
+
+@admi.route("/admin/scheduledtasks", methods=["POST"])
+@login_required
+@admin_required
+def update_scheduledtasks():
+    to_save = request.form.to_dict()
+    _config_int(to_save, "schedule_start_time")
+    _config_int(to_save, "schedule_end_time")
+    _config_checkbox(to_save, "schedule_generate_book_covers")
+    _config_checkbox(to_save, "schedule_generate_series_covers")
+
+    try:
+        config.save()
+        flash(_(u"Scheduled tasks settings updated"), category="success")
+
+        # Cancel any running tasks
+        schedule.end_scheduled_tasks()
+
+        # Re-register tasks with new settings
+        schedule.register_scheduled_tasks()
+    except IntegrityError as ex:
+        ub.session.rollback()
+        log.error("An unknown error occurred while saving scheduled tasks settings")
+        flash(_(u"An unknown error occurred. Please try again later."), category="error")
+    except OperationalError:
+        ub.session.rollback()
+        log.error("Settings DB is not Writeable")
+        flash(_("Settings DB is not Writeable"), category="error")
+
+    return edit_scheduledtasks()
+
+
 @admi.route("/admin/user/<int:user_id>", methods=["GET", "POST"])
 @login_required
 @admin_required
@@ -1911,3 +1952,13 @@ def extract_dynamic_field_from_filter(user, filtr):
 def extract_user_identifier(user, filtr):
     dynamic_field = extract_dynamic_field_from_filter(user, filtr)
     return extract_user_data_from_field(user, dynamic_field)
+
+
+@admi.route("/ajax/canceltask", methods=['POST'])
+@login_required
+@admin_required
+def cancel_task():
+    task_id = request.get_json().get('task_id', None)
+    worker = WorkerThread.get_instance()
+    worker.end_task(task_id)
+    return ""

cps/config_sql.py

@@ -134,13 +134,18 @@ class _Settings(_Base):
     config_calibre = Column(String)
     config_rarfile_location = Column(String, default=None)
     config_upload_formats = Column(String, default=','.join(constants.EXTENSIONS_UPLOAD))
-    config_unicode_filename =Column(Boolean, default=False)
+    config_unicode_filename = Column(Boolean, default=False)
 
     config_updatechannel = Column(Integer, default=constants.UPDATE_STABLE)
 
     config_reverse_proxy_login_header_name = Column(String)
     config_allow_reverse_proxy_header_login = Column(Boolean, default=False)
 
+    schedule_start_time = Column(Integer, default=4)
+    schedule_end_time = Column(Integer, default=6)
+    schedule_generate_book_covers = Column(Boolean, default=False)
+    schedule_generate_series_covers = Column(Boolean, default=False)
+
     def __repr__(self):
         return self.__class__.__name__
 
@@ -171,7 +176,6 @@ class _ConfigSQL(object):
         if change:
             self.save()
 
-
     def _read_from_storage(self):
         if self._settings is None:
             log.debug("_ConfigSQL._read_from_storage")
@@ -255,6 +259,8 @@ class _ConfigSQL(object):
         return bool((self.mail_server != constants.DEFAULT_MAIL_SERVER and self.mail_server_type == 0)
                     or (self.mail_gmail_token != {} and self.mail_server_type == 1))
 
+    def get_scheduled_task_settings(self):
+        return {k:v for k, v in self.__dict__.items() if k.startswith('schedule_')}
 
     def set_from_dictionary(self, dictionary, field, convertor=None, default=None, encode=None):
         """Possibly updates a field of this object.
@@ -290,7 +296,6 @@ class _ConfigSQL(object):
                 storage[k] = v
         return storage
 
-
     def load(self):
         '''Load all configuration values from the underlying storage.'''
         s = self._read_from_storage()  # type: _Settings
@@ -411,6 +416,7 @@ def autodetect_calibre_binary():
             return element
     return ""
 
+
 def autodetect_unrar_binary():
     if sys.platform == "win32":
         calibre_path = ["C:\\program files\\WinRar\\unRAR.exe",
@@ -422,6 +428,7 @@ def autodetect_unrar_binary():
             return element
     return ""
 
+
 def autodetect_kepubify_binary():
     if sys.platform == "win32":
         calibre_path = ["C:\\program files\\kepubify\\kepubify-windows-64Bit.exe",
@@ -433,6 +440,7 @@ def autodetect_kepubify_binary():
             return element
     return ""
 
+
 def _migrate_database(session):
     # make sure the table is created, if it does not exist
     _Base.metadata.create_all(session.bind)

cps/constants.py

@@ -23,6 +23,9 @@ from sqlalchemy import __version__ as sql_version
 
 sqlalchemy_version2 = ([int(x) for x in sql_version.split('.')] >= [2, 0, 0])
 
+# APP_MODE - production, development, or test
+APP_MODE             = os.environ.get('APP_MODE', 'production')
+
 # if installed via pip this variable is set to true (empty file with name .HOMEDIR present)
 HOME_CONFIG = os.path.isfile(os.path.join(os.path.dirname(os.path.abspath(__file__)), '.HOMEDIR'))
 
@@ -35,6 +38,10 @@ STATIC_DIR          = os.path.join(BASE_DIR, 'cps', 'static')
 TEMPLATES_DIR       = os.path.join(BASE_DIR, 'cps', 'templates')
 TRANSLATIONS_DIR    = os.path.join(BASE_DIR, 'cps', 'translations')
 
+# Cache dir - use CACHE_DIR environment variable, otherwise use the default directory: cps/cache
+DEFAULT_CACHE_DIR   = os.path.join(BASE_DIR, 'cps', 'cache')
+CACHE_DIR           = os.environ.get('CACHE_DIR', DEFAULT_CACHE_DIR)
+
 if HOME_CONFIG:
     home_dir = os.path.join(os.path.expanduser("~"), ".calibre-web")
     if not os.path.exists(home_dir):
@@ -162,6 +169,19 @@ NIGHTLY_VERSION[1] = '$Format:%cI$'
 # NIGHTLY_VERSION[0] = 'bb7d2c6273ae4560e83950d36d64533343623a57'
 # NIGHTLY_VERSION[1] = '2018-09-09T10:13:08+02:00'
 
+# CACHE
+CACHE_TYPE_THUMBNAILS    = 'thumbnails'
+
+# Thumbnail Types
+THUMBNAIL_TYPE_COVER     = 1
+THUMBNAIL_TYPE_SERIES    = 2
+THUMBNAIL_TYPE_AUTHOR    = 3
+
+# Thumbnails Sizes
+COVER_THUMBNAIL_ORIGINAL = 0
+COVER_THUMBNAIL_SMALL    = 1
+COVER_THUMBNAIL_MEDIUM   = 2
+COVER_THUMBNAIL_LARGE    = 3
 
 # clean-up the module namespace
 del sys, os, namedtuple

cps/db.py

@@ -450,11 +450,11 @@ class CalibreDB():
         """
         self.session = None
         if self._init:
-            self.initSession(expire_on_commit)
+            self.init_session(expire_on_commit)
 
         self.instances.add(self)
 
-    def initSession(self, expire_on_commit=True):
+    def init_session(self, expire_on_commit=True):
         self.session = self.session_factory()
         self.session.expire_on_commit = expire_on_commit
         self.update_title_sort(self.config)
@@ -603,7 +603,7 @@ class CalibreDB():
                                                           autoflush=True,
                                                           bind=cls.engine))
         for inst in cls.instances:
-            inst.initSession()
+            inst.init_session()
 
         cls._init = True
         return True
@@ -720,7 +720,8 @@ class CalibreDB():
             randm = self.session.query(Books) \
                 .filter(self.common_filters(allow_show_archived)) \
                 .order_by(func.random()) \
-                .limit(self.config.config_random_books).all()
+                .limit(self.config.config_random_books) \
+                .all()
         else:
             randm = false()
         if join_archive_read:

cps/editbooks.py

@@ -686,6 +686,7 @@ def upload_cover(request, book):
                 abort(403)
             ret, message = helper.save_cover(requested_file, book.path)
             if ret is True:
+                helper.clear_cover_thumbnail_cache(book.id)
                 return True
             else:
                 flash(message, category="error")
@@ -809,6 +810,7 @@ def edit_book(book_id):
                         if result is True:
                             book.has_cover = 1
                             modif_date = True
+                            helper.clear_cover_thumbnail_cache(book.id)
                         else:
                             flash(error, category="error")
 

cps/fs.py

@@ -0,0 +1,96 @@
+# -*- coding: utf-8 -*-
+
+#   This file is part of the Calibre-Web (https://github.com/janeczku/calibre-web)
+#     Copyright (C) 2020 mmonkey
+#
+#   This program is free software: you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation, either version 3 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+from __future__ import division, print_function, unicode_literals
+from . import logger
+from .constants import CACHE_DIR
+from os import makedirs, remove
+from os.path import isdir, isfile, join
+from shutil import rmtree
+
+
+class FileSystem:
+    _instance = None
+    _cache_dir = CACHE_DIR
+
+    def __new__(cls):
+        if cls._instance is None:
+            cls._instance = super(FileSystem, cls).__new__(cls)
+            cls.log = logger.create()
+        return cls._instance
+
+    def get_cache_dir(self, cache_type=None):
+        if not isdir(self._cache_dir):
+            try:
+                makedirs(self._cache_dir)
+            except OSError:
+                self.log.info(f'Failed to create path {self._cache_dir} (Permission denied).')
+                return False
+
+        path = join(self._cache_dir, cache_type)
+        if cache_type and not isdir(path):
+            try:
+                makedirs(path)
+            except OSError:
+                self.log.info(f'Failed to create path {path} (Permission denied).')
+                return False
+
+        return path if cache_type else self._cache_dir
+
+    def get_cache_file_dir(self, filename, cache_type=None):
+        path = join(self.get_cache_dir(cache_type), filename[:2])
+        if not isdir(path):
+            try:
+                makedirs(path)
+            except OSError:
+                self.log.info(f'Failed to create path {path} (Permission denied).')
+                return False
+
+        return path
+
+    def get_cache_file_path(self, filename, cache_type=None):
+        return join(self.get_cache_file_dir(filename, cache_type), filename) if filename else None
+
+    def get_cache_file_exists(self, filename, cache_type=None):
+        path = self.get_cache_file_path(filename, cache_type)
+        return isfile(path)
+
+    def delete_cache_dir(self, cache_type=None):
+        if not cache_type and isdir(self._cache_dir):
+            try:
+                rmtree(self._cache_dir)
+            except OSError:
+                self.log.info(f'Failed to delete path {self._cache_dir} (Permission denied).')
+                return False
+
+        path = join(self._cache_dir, cache_type)
+        if cache_type and isdir(path):
+            try:
+                rmtree(path)
+            except OSError:
+                self.log.info(f'Failed to delete path {path} (Permission denied).')
+                return False
+
+    def delete_cache_file(self, filename, cache_type=None):
+        path = self.get_cache_file_path(filename, cache_type)
+        if isfile(path):
+            try:
+                remove(path)
+            except OSError:
+                self.log.info(f'Failed to delete path {path} (Permission denied).')
+                return False

cps/helper.py

@@ -34,7 +34,7 @@ from babel.units import format_unit
 from flask import send_from_directory, make_response, redirect, abort, url_for
 from flask_babel import gettext as _
 from flask_login import current_user
-from sqlalchemy.sql.expression import true, false, and_, text, func
+from sqlalchemy.sql.expression import true, false, and_, or_, text, func
 from sqlalchemy.exc import InvalidRequestError, OperationalError
 from werkzeug.datastructures import Headers
 from werkzeug.security import generate_password_hash
@@ -49,12 +49,14 @@ except ImportError:
 
 from . import calibre_db, cli
 from .tasks.convert import TaskConvert
-from . import logger, config, get_locale, db, ub, kobo_sync_status
+from . import logger, config, get_locale, db, ub, kobo_sync_status, fs
 from . import gdriveutils as gd
-from .constants import STATIC_DIR as _STATIC_DIR
+from .constants import STATIC_DIR as _STATIC_DIR, CACHE_TYPE_THUMBNAILS, THUMBNAIL_TYPE_COVER, THUMBNAIL_TYPE_SERIES
 from .subproc_wrapper import process_wait
-from .services.worker import WorkerThread, STAT_WAITING, STAT_FAIL, STAT_STARTED, STAT_FINISH_SUCCESS
+from .services.worker import WorkerThread, STAT_WAITING, STAT_FAIL, STAT_STARTED, STAT_FINISH_SUCCESS, STAT_ENDED, \
+    STAT_CANCELLED
 from .tasks.mail import TaskEmail
+from .tasks.thumbnail import TaskClearCoverThumbnailCache
 
 log = logger.create()
 
@@ -497,6 +499,7 @@ def upload_new_file_gdrive(book_id, first_author, renamed_author, title, title_d
     return error
 
 
+
 def update_dir_structure_gdrive(book_id, first_author, renamed_author):
     error = False
     book = calibre_db.get_book(book_id)
@@ -633,6 +636,7 @@ def uniq(inpt):
             output.append(x)
     return output
 
+
 def check_email(email):
     email = valid_email(email)
     if ub.session.query(ub.User).filter(func.lower(ub.User.email) == email.lower()).first():
@@ -679,6 +683,7 @@ def update_dir_structure(book_id,
 
 
 def delete_book(book, calibrepath, book_format):
+    clear_cover_thumbnail_cache(book.id)
     if config.config_use_google_drive:
         return delete_book_gdrive(book, book_format)
     else:
@@ -692,19 +697,29 @@ def get_cover_on_failure(use_generic_cover):
         return None
 
 
-def get_book_cover(book_id):
+def get_book_cover(book_id, resolution=None):
     book = calibre_db.get_filtered_book(book_id, allow_show_archived=True)
-    return get_book_cover_internal(book, use_generic_cover_on_failure=True)
+    return get_book_cover_internal(book, use_generic_cover_on_failure=True, resolution=resolution)
 
 
-def get_book_cover_with_uuid(book_uuid,
-                             use_generic_cover_on_failure=True):
+def get_book_cover_with_uuid(book_uuid, use_generic_cover_on_failure=True):
     book = calibre_db.get_book_by_uuid(book_uuid)
     return get_book_cover_internal(book, use_generic_cover_on_failure)
 
 
-def get_book_cover_internal(book, use_generic_cover_on_failure):
+def get_book_cover_internal(book, use_generic_cover_on_failure, resolution=None):
     if book and book.has_cover:
+
+        # Send the book cover thumbnail if it exists in cache
+        if resolution:
+            thumbnail = get_book_cover_thumbnail(book, resolution)
+            if thumbnail:
+                cache = fs.FileSystem()
+                if cache.get_cache_file_exists(thumbnail.filename, CACHE_TYPE_THUMBNAILS):
+                    return send_from_directory(cache.get_cache_file_dir(thumbnail.filename, CACHE_TYPE_THUMBNAILS),
+                                               thumbnail.filename)
+
+        # Send the book cover from Google Drive if configured
         if config.config_use_google_drive:
             try:
                 if not gd.is_gdrive_ready():
@@ -718,6 +733,8 @@ def get_book_cover_internal(book, use_generic_cover_on_failure):
             except Exception as ex:
                 log.debug_or_exception(ex)
                 return get_cover_on_failure(use_generic_cover_on_failure)
+
+        # Send the book cover from the Calibre directory
         else:
             cover_file_path = os.path.join(config.config_calibre_dir, book.path)
             if os.path.isfile(os.path.join(cover_file_path, "cover.jpg")):
@@ -728,6 +745,56 @@ def get_book_cover_internal(book, use_generic_cover_on_failure):
         return get_cover_on_failure(use_generic_cover_on_failure)
 
 
+def get_book_cover_thumbnail(book, resolution):
+    if book and book.has_cover:
+        return ub.session \
+            .query(ub.Thumbnail) \
+            .filter(ub.Thumbnail.type == THUMBNAIL_TYPE_COVER) \
+            .filter(ub.Thumbnail.entity_id == book.id) \
+            .filter(ub.Thumbnail.resolution == resolution) \
+            .filter(or_(ub.Thumbnail.expiration.is_(None), ub.Thumbnail.expiration > datetime.utcnow())) \
+            .first()
+
+
+def get_series_thumbnail_on_failure(series_id, resolution):
+    book = calibre_db.session \
+        .query(db.Books) \
+        .join(db.books_series_link) \
+        .join(db.Series) \
+        .filter(db.Series.id == series_id) \
+        .filter(db.Books.has_cover == 1) \
+        .first()
+
+    return get_book_cover_internal(book, use_generic_cover_on_failure=True, resolution=resolution)
+
+
+def get_series_cover_thumbnail(series_id, resolution=None):
+    return get_series_cover_internal(series_id, resolution)
+
+
+def get_series_cover_internal(series_id, resolution=None):
+    # Send the series thumbnail if it exists in cache
+    if resolution:
+        thumbnail = get_series_thumbnail(series_id, resolution)
+        if thumbnail:
+            cache = fs.FileSystem()
+            if cache.get_cache_file_exists(thumbnail.filename, CACHE_TYPE_THUMBNAILS):
+                return send_from_directory(cache.get_cache_file_dir(thumbnail.filename, CACHE_TYPE_THUMBNAILS),
+                                           thumbnail.filename)
+
+    return get_series_thumbnail_on_failure(series_id, resolution)
+
+
+def get_series_thumbnail(series_id, resolution):
+    return ub.session \
+        .query(ub.Thumbnail) \
+        .filter(ub.Thumbnail.type == THUMBNAIL_TYPE_SERIES) \
+        .filter(ub.Thumbnail.entity_id == series_id) \
+        .filter(ub.Thumbnail.resolution == resolution) \
+        .filter(or_(ub.Thumbnail.expiration.is_(None), ub.Thumbnail.expiration > datetime.utcnow())) \
+        .first()
+
+
 # saves book cover from url
 def save_cover_from_url(url, book_path):
     try:
@@ -920,12 +987,22 @@ def render_task_status(tasklist):
                     ret['status'] = _(u'Started')
                 elif task.stat == STAT_FINISH_SUCCESS:
                     ret['status'] = _(u'Finished')
+                elif task.stat == STAT_ENDED:
+                    ret['status'] = _(u'Ended')
+                elif task.stat == STAT_CANCELLED:
+                    ret['status'] = _(u'Cancelled')
                 else:
                     ret['status'] = _(u'Unknown Status')
 
-            ret['taskMessage'] = "{}: {}".format(_(task.name), task.message)
+            ret['taskMessage'] = "{}: {}".format(_(task.name), task.message) if task.message else _(task.name)
             ret['progress'] = "{} %".format(int(task.progress * 100))
             ret['user'] = escape(user)  # prevent xss
+
+            # Hidden fields
+            ret['id'] = task.id
+            ret['stat'] = task.stat
+            ret['is_cancellable'] = task.is_cancellable
+
             renderedtasklist.append(ret)
 
     return renderedtasklist
@@ -994,3 +1071,7 @@ def get_download_link(book_id, book_format, client):
         return do_download_file(book, book_format, client, data1, headers)
     else:
         abort(404)
+
+
+def clear_cover_thumbnail_cache(book_id):
+    WorkerThread.add(None, TaskClearCoverThumbnailCache(book_id))

cps/jinjia.py

@@ -31,8 +31,7 @@ from flask import Blueprint, request, url_for
 from flask_babel import get_locale
 from flask_login import current_user
 from markupsafe import escape
-from . import logger
-
+from . import constants, logger
 
 jinjia = Blueprint('jinjia', __name__)
 log = logger.create()
@@ -128,12 +127,55 @@ def formatseriesindex_filter(series_index):
             return series_index
     return 0
 
+
 @jinjia.app_template_filter('escapedlink')
 def escapedlink_filter(url, text):
     return "<a href='{}'>{}</a>".format(url, escape(text))
 
+
 @jinjia.app_template_filter('uuidfilter')
 def uuidfilter(var):
     return uuid4()
 
 
+@jinjia.app_template_filter('cache_timestamp')
+def cache_timestamp(rolling_period='month'):
+    if rolling_period == 'day':
+        return str(int(datetime.datetime.today().replace(hour=1, minute=1).timestamp()))
+    elif rolling_period == 'year':
+        return str(int(datetime.datetime.today().replace(day=1).timestamp()))
+    else:
+        return str(int(datetime.datetime.today().replace(month=1, day=1).timestamp()))
+
+
+@jinjia.app_template_filter('last_modified')
+def book_last_modified(book):
+    return str(int(book.last_modified.timestamp()))
+
+
+@jinjia.app_template_filter('get_cover_srcset')
+def get_cover_srcset(book):
+    srcset = list()
+    resolutions = {
+        constants.COVER_THUMBNAIL_SMALL: 'sm',
+        constants.COVER_THUMBNAIL_MEDIUM: 'md',
+        constants.COVER_THUMBNAIL_LARGE: 'lg'
+    }
+    for resolution, shortname in resolutions.items():
+        url = url_for('web.get_cover', book_id=book.id, resolution=shortname, c=book_last_modified(book))
+        srcset.append(f'{url} {resolution}x')
+    return ', '.join(srcset)
+
+
+@jinjia.app_template_filter('get_series_srcset')
+def get_cover_srcset(series):
+    srcset = list()
+    resolutions = {
+        constants.COVER_THUMBNAIL_SMALL: 'sm',
+        constants.COVER_THUMBNAIL_MEDIUM: 'md',
+        constants.COVER_THUMBNAIL_LARGE: 'lg'
+    }
+    for resolution, shortname in resolutions.items():
+        url = url_for('web.get_series_cover', series_id=series.id, resolution=shortname, c=cache_timestamp())
+        srcset.append(f'{url} {resolution}x')
+    return ', '.join(srcset)

cps/schedule.py

@@ -0,0 +1,88 @@
+# -*- coding: utf-8 -*-
+
+#   This file is part of the Calibre-Web (https://github.com/janeczku/calibre-web)
+#     Copyright (C) 2020 mmonkey
+#
+#   This program is free software: you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation, either version 3 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+import datetime
+
+from . import config, constants
+from .services.background_scheduler import BackgroundScheduler
+from .tasks.database import TaskReconnectDatabase
+from .tasks.thumbnail import TaskGenerateCoverThumbnails, TaskGenerateSeriesThumbnails
+from .services.worker import WorkerThread
+
+
+def get_scheduled_tasks(reconnect=True):
+    tasks = list()
+
+    # Reconnect Calibre database (metadata.db)
+    if reconnect:
+        tasks.append(lambda: TaskReconnectDatabase())
+
+    # Generate all missing book cover thumbnails
+    if config.schedule_generate_book_covers:
+        tasks.append(lambda: TaskGenerateCoverThumbnails())
+
+    # Generate all missing series thumbnails
+    if config.schedule_generate_series_covers:
+        tasks.append(lambda: TaskGenerateSeriesThumbnails())
+
+    return tasks
+
+
+def end_scheduled_tasks():
+    worker = WorkerThread.get_instance()
+    for __, __, __, task in worker.tasks:
+        if task.scheduled and task.is_cancellable:
+            worker.end_task(task.id)
+
+
+def register_scheduled_tasks():
+    scheduler = BackgroundScheduler()
+
+    if scheduler:
+        # Remove all existing jobs
+        scheduler.remove_all_jobs()
+
+        start = config.schedule_start_time
+        end = config.schedule_end_time
+
+        # Register scheduled tasks
+        if start != end:
+            scheduler.schedule_tasks(tasks=get_scheduled_tasks(), trigger='cron', hour=start)
+            scheduler.schedule(func=end_scheduled_tasks, trigger='cron', hour=end)
+
+        # Kick-off tasks, if they should currently be running
+        if should_task_be_running(start, end):
+            scheduler.schedule_tasks_immediately(tasks=get_scheduled_tasks(False))
+
+
+def register_startup_tasks():
+    scheduler = BackgroundScheduler()
+
+    if scheduler:
+        start = config.schedule_start_time
+        end = config.schedule_end_time
+
+        # Run scheduled tasks immediately for development and testing
+        # Ignore tasks that should currently be running, as these will be added when registering scheduled tasks
+        if constants.APP_MODE in ['development', 'test'] and not should_task_be_running(start, end):
+            scheduler.schedule_tasks_immediately(tasks=get_scheduled_tasks(False))
+
+
+def should_task_be_running(start, end):
+    now = datetime.datetime.now().hour
+    return (start < end and start <= now < end) or (end < start <= now or now < end)

cps/services/background_scheduler.py

@@ -0,0 +1,84 @@
+# -*- coding: utf-8 -*-
+
+#   This file is part of the Calibre-Web (https://github.com/janeczku/calibre-web)
+#     Copyright (C) 2020 mmonkey
+#
+#   This program is free software: you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation, either version 3 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+import atexit
+
+from .. import logger
+from .worker import WorkerThread
+
+try:
+    from apscheduler.schedulers.background import BackgroundScheduler as BScheduler
+    use_APScheduler = True
+except (ImportError, RuntimeError) as e:
+    use_APScheduler = False
+    log = logger.create()
+    log.info('APScheduler not found. Unable to schedule tasks.')
+
+
+class BackgroundScheduler:
+    _instance = None
+
+    def __new__(cls):
+        if not use_APScheduler:
+            return False
+
+        if cls._instance is None:
+            cls._instance = super(BackgroundScheduler, cls).__new__(cls)
+            cls.log = logger.create()
+            cls.scheduler = BScheduler()
+            cls.scheduler.start()
+
+            atexit.register(lambda: cls.scheduler.shutdown())
+
+        return cls._instance
+
+    def schedule(self, func, trigger, **trigger_args):
+        if use_APScheduler:
+            return self.scheduler.add_job(func=func, trigger=trigger, **trigger_args)
+
+    # Expects a lambda expression for the task
+    def schedule_task(self, task, user=None, trigger='cron', **trigger_args):
+        if use_APScheduler:
+            def scheduled_task():
+                worker_task = task()
+                worker_task.scheduled = True
+                WorkerThread.add(user, worker_task)
+            return self.schedule(func=scheduled_task, trigger=trigger, **trigger_args)
+
+    # Expects a list of lambda expressions for the tasks
+    def schedule_tasks(self, tasks, user=None, trigger='cron', **trigger_args):
+        if use_APScheduler:
+            for task in tasks:
+                self.schedule_task(task, user=user, trigger=trigger, **trigger_args)
+
+    # Expects a lambda expression for the task
+    def schedule_task_immediately(self, task, user=None):
+        if use_APScheduler:
+            def immediate_task():
+                WorkerThread.add(user, task())
+            return self.schedule(func=immediate_task, trigger='date')
+
+    # Expects a list of lambda expressions for the tasks
+    def schedule_tasks_immediately(self, tasks, user=None):
+        if use_APScheduler:
+            for task in tasks:
+                self.schedule_task_immediately(task, user)
+
+    # Remove all jobs
+    def remove_all_jobs(self):
+        self.scheduler.remove_all_jobs()

cps/services/worker.py

@@ -37,6 +37,8 @@ STAT_WAITING = 0
 STAT_FAIL = 1
 STAT_STARTED = 2
 STAT_FINISH_SUCCESS = 3
+STAT_ENDED = 4
+STAT_CANCELLED = 5
 
 # Only retain this many tasks in dequeued list
 TASK_CLEANUP_TRIGGER = 20
@@ -51,7 +53,6 @@ def _get_main_thread():
     raise Exception("main thread not found?!")
 
 
-
 class ImprovedQueue(queue.Queue):
     def to_list(self):
         """
@@ -61,12 +62,13 @@ class ImprovedQueue(queue.Queue):
         with self.mutex:
             return list(self.queue)
 
+
 # Class for all worker tasks in the background
 class WorkerThread(threading.Thread):
     _instance = None
 
     @classmethod
-    def getInstance(cls):
+    def get_instance(cls):
         if cls._instance is None:
             cls._instance = WorkerThread()
         return cls._instance
@@ -83,12 +85,13 @@ class WorkerThread(threading.Thread):
 
     @classmethod
     def add(cls, user, task):
-        ins = cls.getInstance()
+        ins = cls.get_instance()
         ins.num += 1
-        log.debug("Add Task for user: {} - {}".format(user, task))
+        username = user if user is not None else 'System'
+        log.debug("Add Task for user: {} - {}".format(username, task))
         ins.queue.put(QueuedTask(
             num=ins.num,
-            user=user,
+            user=username,
             added=datetime.now(),
             task=task,
         ))
@@ -144,8 +147,18 @@ class WorkerThread(threading.Thread):
                 # CalibreTask.start() should wrap all exceptions in it's own error handling
                 item.task.start(self)
 
+            # remove self_cleanup tasks from list
+            if item.task.self_cleanup:
+                self.dequeued.remove(item)
+
             self.queue.task_done()
 
+    def end_task(self, task_id):
+        ins = self.get_instance()
+        for __, __, __, task in ins.tasks:
+            if str(task.id) == str(task_id) and task.is_cancellable:
+                task.stat = STAT_CANCELLED if task.stat == STAT_WAITING else STAT_ENDED
+
 
 class CalibreTask:
     __metaclass__ = abc.ABCMeta
@@ -158,10 +171,12 @@ class CalibreTask:
         self.end_time = None
         self.message = message
         self.id = uuid.uuid4()
+        self.self_cleanup = False
+        self._scheduled = False
 
     @abc.abstractmethod
     def run(self, worker_thread):
-        """Provides the caller some human-readable name for this class"""
+        """The main entry-point for this task"""
         raise NotImplementedError
 
     @abc.abstractmethod
@@ -169,6 +184,11 @@ class CalibreTask:
         """Provides the caller some human-readable name for this class"""
         raise NotImplementedError
 
+    @abc.abstractmethod
+    def is_cancellable(self):
+        """Does this task gracefully handle being cancelled (STAT_ENDED, STAT_CANCELLED)?"""
+        raise NotImplementedError
+
     def start(self, *args):
         self.start_time = datetime.now()
         self.stat = STAT_STARTED
@@ -219,7 +239,7 @@ class CalibreTask:
         We have a separate dictating this because there may be certain tasks that want to override this
         """
         # By default, we're good to clean a task if it's "Done"
-        return self.stat in (STAT_FINISH_SUCCESS, STAT_FAIL)
+        return self.stat in (STAT_FINISH_SUCCESS, STAT_FAIL, STAT_ENDED, STAT_CANCELLED)
 
     '''@progress.setter
     def progress(self, x):        
@@ -229,6 +249,22 @@ class CalibreTask:
             x = 0
         self._progress = x'''
 
+    @property
+    def self_cleanup(self):
+        return self._self_cleanup
+
+    @self_cleanup.setter
+    def self_cleanup(self, is_self_cleanup):
+        self._self_cleanup = is_self_cleanup
+
+    @property
+    def scheduled(self):
+        return self._scheduled
+
+    @scheduled.setter
+    def scheduled(self, is_scheduled):
+        self._scheduled = is_scheduled
+
     def _handleError(self, error_message):
         self.stat = STAT_FAIL
         self.progress = 1

cps/static/css/caliBlur.css

@@ -5150,7 +5150,7 @@ body.login > div.navbar.navbar-default.navbar-static-top > div > div.navbar-head
     pointer-events: none
 }
 
-#DeleteDomain:hover:before, #RestartDialog:hover:before, #ShutdownDialog:hover:before, #StatusDialog:hover:before, #deleteButton, #deleteModal:hover:before, body.mailset > div.container-fluid > div > div.col-sm-10 > div.discover td > a:hover {
+#DeleteDomain:hover:before, #RestartDialog:hover:before, #ShutdownDialog:hover:before, #StatusDialog:hover:before,  #deleteButton, #deleteModal:hover:before, #cancelTaskModal:hover:before, body.mailset > div.container-fluid > div > div.col-sm-10 > div.discover td > a:hover {
     cursor: pointer
 }
 
@@ -5237,7 +5237,11 @@ body.admin > div.container-fluid > div > div.col-sm-10 > div.container-fluid > d
     margin-bottom: 20px
 }
 
-body.admin:not(.modal-open) .btn-default {
+body.admin > div.container-fluid div.scheduled_tasks_details {
+    margin-bottom: 20px
+}
+
+body.admin .btn-default {
     margin-bottom: 10px
 }
 
@@ -5468,7 +5472,7 @@ body.admin.modal-open .navbar {
     z-index: 0 !important
 }
 
-#RestartDialog, #ShutdownDialog, #StatusDialog, #deleteModal {
+#RestartDialog, #ShutdownDialog, #StatusDialog, #deleteModal, #cancelTaskModal {
     top: 0;
     overflow: hidden;
     padding-top: 70px;
@@ -5478,7 +5482,7 @@ body.admin.modal-open .navbar {
     background: rgba(0, 0, 0, .5)
 }
 
-#RestartDialog:before, #ShutdownDialog:before, #StatusDialog:before, #deleteModal:before {
+#RestartDialog:before, #ShutdownDialog:before, #StatusDialog:before, #deleteModal:before, #cancelTaskModal:before {
     content: "\E208";
     padding-right: 10px;
     display: block;
@@ -5500,18 +5504,18 @@ body.admin.modal-open .navbar {
     z-index: 99
 }
 
-#RestartDialog.in:before, #ShutdownDialog.in:before, #StatusDialog.in:before, #deleteModal.in:before {
+#RestartDialog.in:before, #ShutdownDialog.in:before, #StatusDialog.in:before, #deleteModal.in:before, #cancelTaskModal.in:before {
     -webkit-transform: translate(0, 0);
     -ms-transform: translate(0, 0);
     transform: translate(0, 0)
 }
 
-#RestartDialog > .modal-dialog, #ShutdownDialog > .modal-dialog, #StatusDialog > .modal-dialog, #deleteModal > .modal-dialog {
+#RestartDialog > .modal-dialog, #ShutdownDialog > .modal-dialog, #StatusDialog > .modal-dialog, #deleteModal > .modal-dialog, #cancelTaskModal > .modal-dialog {
     width: 450px;
     margin: auto
 }
 
-#RestartDialog > .modal-dialog > .modal-content, #ShutdownDialog > .modal-dialog > .modal-content, #StatusDialog > .modal-dialog > .modal-content, #deleteModal > .modal-dialog > .modal-content {
+#RestartDialog > .modal-dialog > .modal-content, #ShutdownDialog > .modal-dialog > .modal-content, #StatusDialog > .modal-dialog > .modal-content, #deleteModal > .modal-dialog > .modal-content, #cancelTaskModal > .modal-dialog > .modal-content {
     max-height: calc(100% - 90px);
     -webkit-box-shadow: 0 5px 15px rgba(0, 0, 0, .5);
     box-shadow: 0 5px 15px rgba(0, 0, 0, .5);
@@ -5522,7 +5526,7 @@ body.admin.modal-open .navbar {
     width: 450px
 }
 
-#RestartDialog > .modal-dialog > .modal-content > .modal-header, #ShutdownDialog > .modal-dialog > .modal-content > .modal-header, #StatusDialog > .modal-dialog > .modal-content > .modal-header, #deleteModal > .modal-dialog > .modal-content > .modal-header {
+#RestartDialog > .modal-dialog > .modal-content > .modal-header, #ShutdownDialog > .modal-dialog > .modal-content > .modal-header, #StatusDialog > .modal-dialog > .modal-content > .modal-header, #deleteModal > .modal-dialog > .modal-content > .modal-header, #cancelTaskModal > .modal-dialog > .modal-content > .modal-header {
     padding: 15px 20px;
     border-radius: 3px 3px 0 0;
     line-height: 1.71428571;
@@ -5535,7 +5539,7 @@ body.admin.modal-open .navbar {
     text-align: left
 }
 
-#RestartDialog > .modal-dialog > .modal-content > .modal-header:before, #ShutdownDialog > .modal-dialog > .modal-content > .modal-header:before, #StatusDialog > .modal-dialog > .modal-content > .modal-header:before, #deleteModal > .modal-dialog > .modal-content > .modal-header:before {
+#RestartDialog > .modal-dialog > .modal-content > .modal-header:before, #ShutdownDialog > .modal-dialog > .modal-content > .modal-header:before, #StatusDialog > .modal-dialog > .modal-content > .modal-header:before, #deleteModal > .modal-dialog > .modal-content > .modal-header:before, #cancelTaskModal > .modal-dialog > .modal-content > .modal-header:before {
     padding-right: 10px;
     font-size: 18px;
     color: #999;
@@ -5564,6 +5568,11 @@ body.admin.modal-open .navbar {
     font-family: plex-icons-new, serif
 }
 
+#cancelTaskModal > .modal-dialog > .modal-content > .modal-header:before {
+    content: "\EA6D";
+    font-family: plex-icons-new, serif
+}
+
 #RestartDialog > .modal-dialog > .modal-content > .modal-header:after {
     content: "Restart Calibre-Web";
     display: inline-block;
@@ -5588,7 +5597,13 @@ body.admin.modal-open .navbar {
     font-size: 20px
 }
 
-#StatusDialog > .modal-dialog > .modal-content > .modal-header > span, #deleteModal > .modal-dialog > .modal-content > .modal-header > span, #loader > center > img, .rating-mobile {
+#cancelTaskModal > .modal-dialog > .modal-content > .modal-header:after {
+    content: "Delete Book";
+    display: inline-block;
+    font-size: 20px
+}
+
+#StatusDialog > .modal-dialog > .modal-content > .modal-header > span, #deleteModal > .modal-dialog > .modal-content > .modal-header > span, #cancelTaskModal > .modal-dialog > .modal-content > .modal-header > span, #loader > center > img, .rating-mobile {
     display: none
 }
 
@@ -5602,7 +5617,7 @@ body.admin.modal-open .navbar {
     text-align: left
 }
 
-#ShutdownDialog > .modal-dialog > .modal-content > .modal-body, #StatusDialog > .modal-dialog > .modal-content > .modal-body, #deleteModal > .modal-dialog > .modal-content > .modal-body {
+#ShutdownDialog > .modal-dialog > .modal-content > .modal-body, #StatusDialog > .modal-dialog > .modal-content > .modal-body, #deleteModal > .modal-dialog > .modal-content > .modal-body, #cancelTaskModal > .modal-dialog > .modal-content > .modal-body {
     padding: 20px 20px 40px;
     font-size: 16px;
     line-height: 1.6em;
@@ -5612,7 +5627,7 @@ body.admin.modal-open .navbar {
     text-align: left
 }
 
-#RestartDialog > .modal-dialog > .modal-content > .modal-body > p, #ShutdownDialog > .modal-dialog > .modal-content > .modal-body > p, #StatusDialog > .modal-dialog > .modal-content > .modal-body > p, #deleteModal > .modal-dialog > .modal-content > .modal-body > p {
+#RestartDialog > .modal-dialog > .modal-content > .modal-body > p, #ShutdownDialog > .modal-dialog > .modal-content > .modal-body > p, #StatusDialog > .modal-dialog > .modal-content > .modal-body > p, #deleteModal > .modal-dialog > .modal-content > .modal-body > p, #cancelTaskModal > .modal-dialog > .modal-content > .modal-body > p {
     padding: 20px 20px 0 0;
     font-size: 16px;
     line-height: 1.6em;
@@ -5621,7 +5636,7 @@ body.admin.modal-open .navbar {
     background: #282828
 }
 
-#RestartDialog > .modal-dialog > .modal-content > .modal-body > .btn-default:not(#restart), #ShutdownDialog > .modal-dialog > .modal-content > .modal-body > .btn-default:not(#shutdown), #deleteModal > .modal-dialog > .modal-content > .modal-footer > .btn-default {
+#RestartDialog > .modal-dialog > .modal-content > .modal-body > .btn-default:not(#restart), #ShutdownDialog > .modal-dialog > .modal-content > .modal-body > .btn-default:not(#shutdown), #deleteModal > .modal-dialog > .modal-content > .modal-footer > .btn-default, #cancelTaskModal > .modal-dialog > .modal-content > .modal-footer > .btn-default {
     float: right;
     z-index: 9;
     position: relative;
@@ -5669,6 +5684,18 @@ body.admin.modal-open .navbar {
     border-radius: 3px
 }
 
+#cancelTaskModal > .modal-dialog > .modal-content > .modal-footer > .btn-danger {
+    float: right;
+    z-index: 9;
+    position: relative;
+    margin: 0 0 0 10px;
+    min-width: 80px;
+    padding: 10px 18px;
+    font-size: 16px;
+    line-height: 1.33;
+    border-radius: 3px
+}
+
 #RestartDialog > .modal-dialog > .modal-content > .modal-body > .btn-default:not(#restart) {
     margin: 25px 0 0 10px
 }
@@ -5681,7 +5708,11 @@ body.admin.modal-open .navbar {
     margin: 0 0 0 10px
 }
 
-#RestartDialog > .modal-dialog > .modal-content > .modal-body > .btn-default:not(#restart):hover, #ShutdownDialog > .modal-dialog > .modal-content > .modal-body > .btn-default:not(#shutdown):hover, #deleteModal > .modal-dialog > .modal-content > .modal-footer > .btn-default:hover {
+#cancelTaskModal > .modal-dialog > .modal-content > .modal-footer > .btn-default {
+    margin: 0 0 0 10px
+}
+
+#RestartDialog > .modal-dialog > .modal-content > .modal-body > .btn-default:not(#restart):hover, #ShutdownDialog > .modal-dialog > .modal-content > .modal-body > .btn-default:not(#shutdown):hover, #deleteModal > .modal-dialog > .modal-content > .modal-footer > .btn-default:hover, #cancelTaskModal > .modal-dialog > .modal-content > .modal-footer > .btn-default:hover {
     background-color: hsla(0, 0%, 100%, .3)
 }
 
@@ -7303,11 +7334,11 @@ body.edituser.admin > div.container-fluid > div.row-fluid > div.col-sm-10 > div.
         background-color: transparent !important
     }
 
-    #RestartDialog > .modal-dialog, #ShutdownDialog > .modal-dialog, #StatusDialog > .modal-dialog, #deleteModal > .modal-dialog {
+    #RestartDialog > .modal-dialog, #ShutdownDialog > .modal-dialog, #StatusDialog > .modal-dialog, #deleteModal > .modal-dialog, #cancelTaskModal > .modal-dialog {
         max-width: calc(100vw - 40px)
     }
 
-    #RestartDialog > .modal-dialog > .modal-content, #ShutdownDialog > .modal-dialog > .modal-content, #StatusDialog > .modal-dialog > .modal-content, #deleteModal > .modal-dialog > .modal-content {
+    #RestartDialog > .modal-dialog > .modal-content, #ShutdownDialog > .modal-dialog > .modal-content, #StatusDialog > .modal-dialog > .modal-content, #deleteModal > .modal-dialog > .modal-content, #cancelTaskModal > .modal-dialog > .modal-content {
         max-width: calc(100vw - 40px);
         left: 0
     }
@@ -7457,7 +7488,7 @@ body.edituser.admin > div.container-fluid > div.row-fluid > div.col-sm-10 > div.
         padding: 30px 15px
     }
 
-    #RestartDialog.in:before, #ShutdownDialog.in:before, #StatusDialog.in:before, #deleteModal.in:before {
+    #RestartDialog.in:before, #ShutdownDialog.in:before, #StatusDialog.in:before, #deleteModal.in:before, #cancelTaskModal.in:before {
         left: auto;
         right: 34px
     }

cps/static/js/table.js

@@ -15,7 +15,7 @@
  *  along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-/* exported TableActions, RestrictionActions, EbookActions, responseHandler */
+/* exported TableActions, RestrictionActions, EbookActions, TaskActions, responseHandler */
 /* global getPath, confirmDialog */
 
 var selections = [];
@@ -42,6 +42,24 @@ $(function() {
         }, 1000);
     }
 
+    $("#cancel_task_confirm").click(function() {
+        //get data-id attribute of the clicked element
+        var taskId = $(this).data("task-id");
+        $.ajax({
+            method: "post",
+            contentType: "application/json; charset=utf-8",
+            dataType: "json",
+            url: window.location.pathname + "/../ajax/canceltask",
+            data: JSON.stringify({"task_id": taskId}),
+        });
+    });
+    //triggered when modal is about to be shown
+    $("#cancelTaskModal").on("show.bs.modal", function(e) {
+        //get data-id attribute of the clicked element and store in button
+        var taskId = $(e.relatedTarget).data("task-id");
+        $(e.currentTarget).find("#cancel_task_confirm").data("task-id", taskId);
+    });
+
     $("#books-table").on("check.bs.table check-all.bs.table uncheck.bs.table uncheck-all.bs.table",
         function (e, rowsAfter, rowsBefore) {
             var rows = rowsAfter;
@@ -581,6 +599,7 @@ function handle_header_buttons () {
         $(".header_select").removeAttr("disabled");
     }
 }
+
 /* Function for deleting domain restrictions */
 function TableActions (value, row) {
     return [
@@ -618,6 +637,19 @@ function UserActions (value, row) {
     ].join("");
 }
 
+/* Function for cancelling tasks */
+function TaskActions (value, row) {
+    var cancellableStats = [0, 1, 2];
+    if (row.id && row.is_cancellable && cancellableStats.includes(row.stat)) {
+        return [
+            "<div class=\"task-cancel\" data-toggle=\"modal\" data-target=\"#cancelTaskModal\" data-task-id=\"" + row.id + "\" title=\"Cancel\">",
+            "<i class=\"glyphicon glyphicon-ban-circle\"></i>",
+            "</div>"
+        ].join("");
+    }
+    return '';
+}
+
 /* Function for keeping checked rows */
 function responseHandler(res) {
     $.each(res.rows, function (i, row) {

cps/tasks/convert.py

@@ -273,3 +273,7 @@ class TaskConvert(CalibreTask):
 
     def __str__(self):
         return "Convert {} {}".format(self.bookid, self.kindle_mail)
+
+    @property
+    def is_cancellable(self):
+        return False

cps/tasks/database.py

@@ -0,0 +1,53 @@
+# -*- coding: utf-8 -*-
+
+#   This file is part of the Calibre-Web (https://github.com/janeczku/calibre-web)
+#     Copyright (C) 2020 mmonkey
+#
+#   This program is free software: you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation, either version 3 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+from __future__ import division, print_function, unicode_literals
+
+from cps import config, logger
+from cps.services.worker import CalibreTask
+
+try:
+    from urllib.request import urlopen
+except ImportError as e:
+    from urllib2 import urlopen
+
+
+class TaskReconnectDatabase(CalibreTask):
+    def __init__(self, task_message=u'Reconnecting Calibre database'):
+        super(TaskReconnectDatabase, self).__init__(task_message)
+        self.log = logger.create()
+        self.listen_address = config.get_config_ipaddress()
+        self.listen_port = config.config_port
+
+    def run(self, worker_thread):
+        address = self.listen_address if self.listen_address else 'localhost'
+        port = self.listen_port if self.listen_port else 8083
+
+        try:
+            urlopen('http://' + address + ':' + str(port) + '/reconnect')
+            self._handleSuccess()
+        except Exception as ex:
+            self._handleError(u'Unable to reconnect Calibre database: ' + str(ex))
+
+    @property
+    def name(self):
+        return "Reconnect Database"
+
+    @property
+    def is_cancellable(self):
+        return False

cps/tasks/mail.py

@@ -266,5 +266,9 @@ class TaskEmail(CalibreTask):
     def name(self):
         return "E-mail"
 
+    @property
+    def is_cancellable(self):
+        return False
+
     def __str__(self):
         return "E-mail {}, {}".format(self.name, self.subject)

cps/tasks/thumbnail.py

@@ -0,0 +1,472 @@
+# -*- coding: utf-8 -*-
+
+#   This file is part of the Calibre-Web (https://github.com/janeczku/calibre-web)
+#     Copyright (C) 2020 monkey
+#
+#   This program is free software: you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation, either version 3 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+from __future__ import division, print_function, unicode_literals
+import os
+
+from .. import constants
+from cps import config, db, fs, gdriveutils, logger, ub
+from cps.services.worker import CalibreTask, STAT_CANCELLED, STAT_ENDED
+from datetime import datetime
+from sqlalchemy import func, text, or_
+
+try:
+    from urllib.request import urlopen
+except ImportError as e:
+    from urllib2 import urlopen
+
+try:
+    from wand.image import Image
+    use_IM = True
+except (ImportError, RuntimeError) as e:
+    use_IM = False
+
+
+def get_resize_height(resolution):
+    return int(225 * resolution)
+
+
+def get_resize_width(resolution, original_width, original_height):
+    height = get_resize_height(resolution)
+    percent = (height / float(original_height))
+    width = int((float(original_width) * float(percent)))
+    return width if width % 2 == 0 else width + 1
+
+
+def get_best_fit(width, height, image_width, image_height):
+    resize_width = int(width / 2.0)
+    resize_height = int(height / 2.0)
+    aspect_ratio = image_width / image_height
+
+    # If this image's aspect ratio is different than the first image, then resize this image
+    # to fill the width and height of the first image
+    if aspect_ratio < width / height:
+        resize_width = int(width / 2.0)
+        resize_height = image_height * int(width / 2.0) / image_width
+
+    elif aspect_ratio > width / height:
+        resize_width = image_width * int(height / 2.0) / image_height
+        resize_height = int(height / 2.0)
+
+    return {'width': resize_width, 'height': resize_height}
+
+
+class TaskGenerateCoverThumbnails(CalibreTask):
+    def __init__(self, task_message=''):
+        super(TaskGenerateCoverThumbnails, self).__init__(task_message)
+        self.log = logger.create()
+        self.app_db_session = ub.get_new_session_instance()
+        self.calibre_db = db.CalibreDB(expire_on_commit=False)
+        self.cache = fs.FileSystem()
+        self.resolutions = [
+            constants.COVER_THUMBNAIL_SMALL,
+            constants.COVER_THUMBNAIL_MEDIUM
+        ]
+
+    def run(self, worker_thread):
+        if self.calibre_db.session and use_IM and self.stat != STAT_CANCELLED and self.stat != STAT_ENDED:
+            self.message = 'Scanning Books'
+            books_with_covers = self.get_books_with_covers()
+            count = len(books_with_covers)
+
+            total_generated = 0
+            for i, book in enumerate(books_with_covers):
+                generated = 0
+                book_cover_thumbnails = self.get_book_cover_thumbnails(book.id)
+
+                # Generate new thumbnails for missing covers
+                resolutions = list(map(lambda t: t.resolution, book_cover_thumbnails))
+                missing_resolutions = list(set(self.resolutions).difference(resolutions))
+                for resolution in missing_resolutions:
+                    generated += 1
+                    self.create_book_cover_thumbnail(book, resolution)
+
+                # Replace outdated or missing thumbnails
+                for thumbnail in book_cover_thumbnails:
+                    if book.last_modified > thumbnail.generated_at:
+                        generated += 1
+                        self.update_book_cover_thumbnail(book, thumbnail)
+
+                    elif not self.cache.get_cache_file_exists(thumbnail.filename, constants.CACHE_TYPE_THUMBNAILS):
+                        generated += 1
+                        self.update_book_cover_thumbnail(book, thumbnail)
+
+                # Increment the progress
+                self.progress = (1.0 / count) * i
+
+                if generated > 0:
+                    total_generated += generated
+                    self.message = u'Generated {0} cover thumbnails'.format(total_generated)
+
+                # Check if job has been cancelled or ended
+                if self.stat == STAT_CANCELLED:
+                    self.log.info(f'GenerateCoverThumbnails task has been cancelled.')
+                    return
+
+                if self.stat == STAT_ENDED:
+                    self.log.info(f'GenerateCoverThumbnails task has been ended.')
+                    return
+
+            if total_generated == 0:
+                self.self_cleanup = True
+
+        self._handleSuccess()
+        self.app_db_session.remove()
+
+    def get_books_with_covers(self):
+        return self.calibre_db.session \
+            .query(db.Books) \
+            .filter(db.Books.has_cover == 1) \
+            .all()
+
+    def get_book_cover_thumbnails(self, book_id):
+        return self.app_db_session \
+            .query(ub.Thumbnail) \
+            .filter(ub.Thumbnail.type == constants.THUMBNAIL_TYPE_COVER) \
+            .filter(ub.Thumbnail.entity_id == book_id) \
+            .filter(or_(ub.Thumbnail.expiration.is_(None), ub.Thumbnail.expiration > datetime.utcnow())) \
+            .all()
+
+    def create_book_cover_thumbnail(self, book, resolution):
+        thumbnail = ub.Thumbnail()
+        thumbnail.type = constants.THUMBNAIL_TYPE_COVER
+        thumbnail.entity_id = book.id
+        thumbnail.format = 'jpeg'
+        thumbnail.resolution = resolution
+
+        self.app_db_session.add(thumbnail)
+        try:
+            self.app_db_session.commit()
+            self.generate_book_thumbnail(book, thumbnail)
+        except Exception as ex:
+            self.log.info(u'Error creating book thumbnail: ' + str(ex))
+            self._handleError(u'Error creating book thumbnail: ' + str(ex))
+            self.app_db_session.rollback()
+
+    def update_book_cover_thumbnail(self, book, thumbnail):
+        thumbnail.generated_at = datetime.utcnow()
+
+        try:
+            self.app_db_session.commit()
+            self.cache.delete_cache_file(thumbnail.filename, constants.CACHE_TYPE_THUMBNAILS)
+            self.generate_book_thumbnail(book, thumbnail)
+        except Exception as ex:
+            self.log.info(u'Error updating book thumbnail: ' + str(ex))
+            self._handleError(u'Error updating book thumbnail: ' + str(ex))
+            self.app_db_session.rollback()
+
+    def generate_book_thumbnail(self, book, thumbnail):
+        if book and thumbnail:
+            if config.config_use_google_drive:
+                if not gdriveutils.is_gdrive_ready():
+                    raise Exception('Google Drive is configured but not ready')
+
+                web_content_link = gdriveutils.get_cover_via_gdrive(book.path)
+                if not web_content_link:
+                    raise Exception('Google Drive cover url not found')
+
+                stream = None
+                try:
+                    stream = urlopen(web_content_link)
+                    with Image(file=stream) as img:
+                        height = get_resize_height(thumbnail.resolution)
+                        if img.height > height:
+                            width = get_resize_width(thumbnail.resolution, img.width, img.height)
+                            img.resize(width=width, height=height, filter='lanczos')
+                            img.format = thumbnail.format
+                            filename = self.cache.get_cache_file_path(thumbnail.filename,
+                                                                      constants.CACHE_TYPE_THUMBNAILS)
+                            img.save(filename=filename)
+                except Exception as ex:
+                    # Bubble exception to calling function
+                    self.log.info(u'Error generating thumbnail file: ' + str(ex))
+                    raise ex
+                finally:
+                    if stream is not None:
+                        stream.close()
+            else:
+                book_cover_filepath = os.path.join(config.config_calibre_dir, book.path, 'cover.jpg')
+                if not os.path.isfile(book_cover_filepath):
+                    raise Exception('Book cover file not found')
+
+                with Image(filename=book_cover_filepath) as img:
+                    height = get_resize_height(thumbnail.resolution)
+                    if img.height > height:
+                        width = get_resize_width(thumbnail.resolution, img.width, img.height)
+                        img.resize(width=width, height=height, filter='lanczos')
+                        img.format = thumbnail.format
+                        filename = self.cache.get_cache_file_path(thumbnail.filename, constants.CACHE_TYPE_THUMBNAILS)
+                        img.save(filename=filename)
+
+    @property
+    def name(self):
+        return 'GenerateCoverThumbnails'
+
+    @property
+    def is_cancellable(self):
+        return True
+
+
+class TaskGenerateSeriesThumbnails(CalibreTask):
+    def __init__(self, task_message=''):
+        super(TaskGenerateSeriesThumbnails, self).__init__(task_message)
+        self.log = logger.create()
+        self.app_db_session = ub.get_new_session_instance()
+        self.calibre_db = db.CalibreDB(expire_on_commit=False)
+        self.cache = fs.FileSystem()
+        self.resolutions = [
+            constants.COVER_THUMBNAIL_SMALL,
+            constants.COVER_THUMBNAIL_MEDIUM,
+        ]
+
+    def run(self, worker_thread):
+        if self.calibre_db.session and use_IM and self.stat != STAT_CANCELLED and self.stat != STAT_ENDED:
+            self.message = 'Scanning Series'
+            all_series = self.get_series_with_four_plus_books()
+            count = len(all_series)
+
+            total_generated = 0
+            for i, series in enumerate(all_series):
+                generated = 0
+                series_thumbnails = self.get_series_thumbnails(series.id)
+                series_books = self.get_series_books(series.id)
+
+                # Generate new thumbnails for missing covers
+                resolutions = list(map(lambda t: t.resolution, series_thumbnails))
+                missing_resolutions = list(set(self.resolutions).difference(resolutions))
+                for resolution in missing_resolutions:
+                    generated += 1
+                    self.create_series_thumbnail(series, series_books, resolution)
+
+                # Replace outdated or missing thumbnails
+                for thumbnail in series_thumbnails:
+                    if any(book.last_modified > thumbnail.generated_at for book in series_books):
+                        generated += 1
+                        self.update_series_thumbnail(series_books, thumbnail)
+
+                    elif not self.cache.get_cache_file_exists(thumbnail.filename, constants.CACHE_TYPE_THUMBNAILS):
+                        generated += 1
+                        self.update_series_thumbnail(series_books, thumbnail)
+
+                # Increment the progress
+                self.progress = (1.0 / count) * i
+
+                if generated > 0:
+                    total_generated += generated
+                    self.message = u'Generated {0} series thumbnails'.format(total_generated)
+
+                # Check if job has been cancelled or ended
+                if self.stat == STAT_CANCELLED:
+                    self.log.info(f'GenerateSeriesThumbnails task has been cancelled.')
+                    return
+
+                if self.stat == STAT_ENDED:
+                    self.log.info(f'GenerateSeriesThumbnails task has been ended.')
+                    return
+
+            if total_generated == 0:
+                self.self_cleanup = True
+
+        self._handleSuccess()
+        self.app_db_session.remove()
+
+    def get_series_with_four_plus_books(self):
+        return self.calibre_db.session \
+            .query(db.Series) \
+            .join(db.books_series_link) \
+            .join(db.Books) \
+            .filter(db.Books.has_cover == 1) \
+            .group_by(text('books_series_link.series')) \
+            .having(func.count('book_series_link') > 3) \
+            .all()
+
+    def get_series_books(self, series_id):
+        return self.calibre_db.session \
+            .query(db.Books) \
+            .join(db.books_series_link) \
+            .join(db.Series) \
+            .filter(db.Books.has_cover == 1) \
+            .filter(db.Series.id == series_id) \
+            .all()
+
+    def get_series_thumbnails(self, series_id):
+        return self.app_db_session \
+            .query(ub.Thumbnail) \
+            .filter(ub.Thumbnail.type == constants.THUMBNAIL_TYPE_SERIES) \
+            .filter(ub.Thumbnail.entity_id == series_id) \
+            .filter(or_(ub.Thumbnail.expiration.is_(None), ub.Thumbnail.expiration > datetime.utcnow())) \
+            .all()
+
+    def create_series_thumbnail(self, series, series_books, resolution):
+        thumbnail = ub.Thumbnail()
+        thumbnail.type = constants.THUMBNAIL_TYPE_SERIES
+        thumbnail.entity_id = series.id
+        thumbnail.format = 'jpeg'
+        thumbnail.resolution = resolution
+
+        self.app_db_session.add(thumbnail)
+        try:
+            self.app_db_session.commit()
+            self.generate_series_thumbnail(series_books, thumbnail)
+        except Exception as ex:
+            self.log.info(u'Error creating book thumbnail: ' + str(ex))
+            self._handleError(u'Error creating book thumbnail: ' + str(ex))
+            self.app_db_session.rollback()
+
+    def update_series_thumbnail(self, series_books, thumbnail):
+        thumbnail.generated_at = datetime.utcnow()
+
+        try:
+            self.app_db_session.commit()
+            self.cache.delete_cache_file(thumbnail.filename, constants.CACHE_TYPE_THUMBNAILS)
+            self.generate_series_thumbnail(series_books, thumbnail)
+        except Exception as ex:
+            self.log.info(u'Error updating book thumbnail: ' + str(ex))
+            self._handleError(u'Error updating book thumbnail: ' + str(ex))
+            self.app_db_session.rollback()
+
+    def generate_series_thumbnail(self, series_books, thumbnail):
+        # Get the last four books in the series based on series_index
+        books = sorted(series_books, key=lambda b: float(b.series_index), reverse=True)[:4]
+
+        top = 0
+        left = 0
+        width = 0
+        height = 0
+        with Image() as canvas:
+            for book in books:
+                if config.config_use_google_drive:
+                    if not gdriveutils.is_gdrive_ready():
+                        raise Exception('Google Drive is configured but not ready')
+
+                    web_content_link = gdriveutils.get_cover_via_gdrive(book.path)
+                    if not web_content_link:
+                        raise Exception('Google Drive cover url not found')
+
+                    stream = None
+                    try:
+                        stream = urlopen(web_content_link)
+                        with Image(file=stream) as img:
+                            # Use the first image in this set to determine the width and height to scale the
+                            # other images in this set
+                            if width == 0 or height == 0:
+                                width = get_resize_width(thumbnail.resolution, img.width, img.height)
+                                height = get_resize_height(thumbnail.resolution)
+                                canvas.blank(width, height)
+
+                            dimensions = get_best_fit(width, height, img.width, img.height)
+
+                            # resize and crop the image
+                            img.resize(width=int(dimensions['width']), height=int(dimensions['height']), filter='lanczos')
+                            img.crop(width=int(width / 2.0), height=int(height / 2.0), gravity='center')
+
+                            # add the image to the canvas
+                            canvas.composite(img, left, top)
+
+                    except Exception as ex:
+                        self.log.info(u'Error generating thumbnail file: ' + str(ex))
+                        raise ex
+                    finally:
+                        if stream is not None:
+                            stream.close()
+
+                book_cover_filepath = os.path.join(config.config_calibre_dir, book.path, 'cover.jpg')
+                if not os.path.isfile(book_cover_filepath):
+                    raise Exception('Book cover file not found')
+
+                with Image(filename=book_cover_filepath) as img:
+                    # Use the first image in this set to determine the width and height to scale the
+                    # other images in this set
+                    if width == 0 or height == 0:
+                        width = get_resize_width(thumbnail.resolution, img.width, img.height)
+                        height = get_resize_height(thumbnail.resolution)
+                        canvas.blank(width, height)
+
+                    dimensions = get_best_fit(width, height, img.width, img.height)
+
+                    # resize and crop the image
+                    img.resize(width=int(dimensions['width']), height=int(dimensions['height']), filter='lanczos')
+                    img.crop(width=int(width / 2.0), height=int(height / 2.0), gravity='center')
+
+                    # add the image to the canvas
+                    canvas.composite(img, left, top)
+
+                # set the coordinates for the next iteration
+                if left == 0 and top == 0:
+                    left = int(width / 2.0)
+                elif left == int(width / 2.0) and top == 0:
+                    left = 0
+                    top = int(height / 2.0)
+                else:
+                    left = int(width / 2.0)
+
+            canvas.format = thumbnail.format
+            filename = self.cache.get_cache_file_path(thumbnail.filename, constants.CACHE_TYPE_THUMBNAILS)
+            canvas.save(filename=filename)
+
+    @property
+    def name(self):
+        return 'GenerateSeriesThumbnails'
+
+    @property
+    def is_cancellable(self):
+        return True
+
+
+class TaskClearCoverThumbnailCache(CalibreTask):
+    def __init__(self, book_id, task_message=u'Clearing cover thumbnail cache'):
+        super(TaskClearCoverThumbnailCache, self).__init__(task_message)
+        self.log = logger.create()
+        self.book_id = book_id
+        self.app_db_session = ub.get_new_session_instance()
+        self.cache = fs.FileSystem()
+
+    def run(self, worker_thread):
+        if self.app_db_session:
+            if self.book_id:
+                thumbnails = self.get_thumbnails_for_book(self.book_id)
+                for thumbnail in thumbnails:
+                    self.delete_thumbnail(thumbnail)
+
+        self._handleSuccess()
+        self.app_db_session.remove()
+
+    def get_thumbnails_for_book(self, book_id):
+        return self.app_db_session \
+            .query(ub.Thumbnail) \
+            .filter(ub.Thumbnail.type == constants.THUMBNAIL_TYPE_COVER) \
+            .filter(ub.Thumbnail.entity_id == book_id) \
+            .all()
+
+    def delete_thumbnail(self, thumbnail):
+        thumbnail.expiration = datetime.utcnow()
+
+        try:
+            self.app_db_session.commit()
+            self.cache.delete_cache_file(thumbnail.filename, constants.CACHE_TYPE_THUMBNAILS)
+        except Exception as ex:
+            self.log.info(u'Error deleting book thumbnail: ' + str(ex))
+            self._handleError(u'Error deleting book thumbnail: ' + str(ex))
+
+    @property
+    def name(self):
+        return 'ThumbnailsClear'
+
+    @property
+    def is_cancellable(self):
+        return False

cps/tasks/upload.py

@@ -36,3 +36,7 @@ class TaskUpload(CalibreTask):
 
     def __str__(self):
         return "Upload {}".format(self.book_title)
+
+    @property
+    def is_cancellable(self):
+        return False

cps/templates/admin.html

@@ -160,6 +160,31 @@
     </div>
   </div>
 
+  <div class="row">
+    <div class="col">
+      <h2>{{_('Scheduled Tasks')}}</h2>
+        <div class="col-xs-12 col-sm-12 scheduled_tasks_details">
+          <div class="row">
+            <div class="col-xs-6 col-sm-3">{{_('Time at which tasks start to run')}}</div>
+            <div class="col-xs-6 col-sm-3">{{config.schedule_start_time}}:00</div>
+          </div>
+          <div class="row">
+            <div class="col-xs-6 col-sm-3">{{_('Time at which tasks stop running')}}</div>
+            <div class="col-xs-6 col-sm-3">{{config.schedule_end_time}}:00</div>
+          </div>
+          <div class="row">
+            <div class="col-xs-6 col-sm-3">{{_('Generate book cover thumbnails')}}</div>
+            <div class="col-xs-6 col-sm-3">{{ display_bool_setting(config.schedule_generate_book_covers) }}</div>
+          </div>
+          <div class="row">
+            <div class="col-xs-6 col-sm-3">{{_('Generate series cover thumbnails')}}</div>
+            <div class="col-xs-6 col-sm-3">{{ display_bool_setting(config.schedule_generate_series_covers) }}</div>
+          </div>
+        </div>
+      <a class="btn btn-default scheduledtasks" id="admin_edit_scheduled_tasks" href="{{url_for('admin.edit_scheduledtasks')}}">{{_('Edit Scheduled Tasks Settings')}}</a>
+    </div>
+  </div>
+
   <div class="row form-group">
     <h2>{{_('Administration')}}</h2>
     <a class="btn btn-default" id="debug" href="{{url_for('admin.download_debug')}}">{{_('Download Debug Package')}}</a>
@@ -167,6 +192,8 @@
   </div>
   <div class="row form-group">
     <div class="btn btn-default" id="restart_database" data-toggle="modal" data-target="#StatusDialog">{{_('Reconnect Calibre Database')}}</div>
+  </div>
+  <div class="row form-group">
     <div class="btn btn-default" id="admin_restart" data-toggle="modal" data-target="#RestartDialog">{{_('Restart')}}</div>
     <div class="btn btn-default" id="admin_stop" data-toggle="modal" data-target="#ShutdownDialog">{{_('Shutdown')}}</div>
   </div>

cps/templates/author.html

@@ -37,7 +37,7 @@
       <div class="cover">
         <a href="{{ url_for('web.show_book', book_id=entry.id) }}">
             <span class="img" title="{{entry.title}}">
-              <img src="{{ url_for('web.get_cover', book_id=entry.id) }}" />
+              {{ image.book_cover(entry, alt=author.name|safe) }}
               {% if entry.id in read_book_ids %}<span class="badge read glyphicon glyphicon-ok"></span>{% endif %}
             </span>
         </a>

cps/templates/book_edit.html

@@ -3,7 +3,8 @@
 {% if book %}
   <div class="col-sm-3 col-lg-3 col-xs-12">
     <div class="cover">
-        <img id="detailcover" title="{{book.title}}" src="{{ url_for('web.get_cover', book_id=book.id, edit=1|uuidfilter)  }}" alt="{{ book.title }}"/>
+        <!-- Always use full-sized image for the book edit page -->
+        <img id="detailcover" title="{{book.title}}" src="{{url_for('web.get_cover', book_id=book.id, resolution='og', c=book|last_modified)}}" />
     </div>
 {% if g.user.role_delete_books() %}
     <div class="text-center">

cps/templates/detail.html

@@ -4,7 +4,8 @@
   <div class="row">
     <div class="col-sm-3 col-lg-3 col-xs-5">
       <div class="cover">
-          <img id="detailcover" title="{{entry.title}}" src="{{ url_for('web.get_cover', book_id=entry.id, edit=1|uuidfilter) }}" alt="{{ entry.title }}" />
+        <!-- Always use full-sized image for the detail page -->
+        <img id="detailcover" title="{{entry.title}}" src="{{url_for('web.get_cover', book_id=entry.id, resolution='og', c=entry|last_modified)}}" />
       </div>
     </div>
     <div class="col-sm-9 col-lg-9 book-meta">

cps/templates/discover.html

@@ -1,3 +1,4 @@
+{% import 'image.html' as image %}
 {% extends "layout.html" %}
 {% block body %}
 <div class="discover load-more">
@@ -9,7 +10,7 @@
         {% if entry.has_cover is defined %}
           <a href="{{ url_for('web.show_book', book_id=entry.id) }}" data-toggle="modal" data-target="#bookDetailsModal" data-remote="false">
             <span class="img" title="{{entry.title}}">
-              <img src="{{ url_for('web.get_cover', book_id=entry.id) }}" alt="{{ entry.title }}" />
+              {{ image.book_cover(entry) }}
               {% if entry.id in read_book_ids %}<span class="badge read glyphicon glyphicon-ok"></span>{% endif %}
             </span>
           </a>

cps/templates/fragment.html

@@ -1,3 +1,4 @@
+{% import 'image.html' as image %}
 <div class="container-fluid">
   {% block body %}{% endblock %}
 </div>

cps/templates/grid.html

@@ -1,3 +1,4 @@
+{% import 'image.html' as image %}
 {% extends "layout.html" %}
 {% block body %}
 <h1 class="{{page}}">{{_(title)}}</h1>
@@ -27,7 +28,7 @@
                   <div class="cover">
                       <a href="{{url_for('web.books_list', data=data, sort_param='stored', book_id=entry[0].series[0].id )}}">
                           <span class="img" title="{{entry[0].series[0].name}}">
-                              <img src="{{ url_for('web.get_cover', book_id=entry[3]) }}" alt="{{ entry[0].series[0].name }}"/>
+                              {{ image.series(entry[0].series[0], alt=entry[0].series[0].name|shortentitle) }}
                               <span class="badge">{{entry.count}}</span>
                             </span>
                       </a>

cps/templates/image.html

@@ -0,0 +1,20 @@
+{% macro book_cover(book, alt=None) -%}
+    {%- set image_title = book.title if book.title else book.name -%}
+    {%- set image_alt = alt if alt else image_title -%}
+    {% set srcset = book|get_cover_srcset %}
+    <img
+        srcset="{{ srcset }}"
+        src="{{ url_for('web.get_cover', book_id=book.id, resolution='og', c=book|last_modified) }}"
+        alt="{{ image_alt }}"
+    />
+{%- endmacro %}
+
+{% macro series(series, alt=None) -%}
+    {%- set image_alt = alt if alt else image_title -%}
+    {% set srcset = series|get_series_srcset %}
+    <img
+        srcset="{{ srcset }}"
+        src="{{ url_for('web.get_series_cover', series_id=series.id, resolution='og', c='day'|cache_timestamp) }}"
+        alt="{{ book_title }}"
+    />
+{%- endmacro %}

cps/templates/index.html

@@ -1,3 +1,4 @@
+{% import 'image.html' as image %}
 {% extends "layout.html" %}
 {% block body %}
 {% if g.user.show_detail_random() %}
@@ -9,7 +10,7 @@
       <div class="cover">
           <a href="{{ url_for('web.show_book', book_id=entry.id) }}" data-toggle="modal" data-target="#bookDetailsModal" data-remote="false">
               <span class="img" title="{{ entry.title }}">
-                <img src="{{ url_for('web.get_cover', book_id=entry.id) }}" alt="{{ entry.title }}" />
+                {{ image.book_cover(entry) }}
                 {% if entry.id in read_book_ids %}<span class="badge read glyphicon glyphicon-ok"></span>{% endif %}
               </span>
           </a>
@@ -91,7 +92,7 @@
       <div class="cover">
           <a href="{{ url_for('web.show_book', book_id=entry.id) }}" data-toggle="modal" data-target="#bookDetailsModal" data-remote="false">
             <span class="img" title="{{ entry.title }}">
-              <img src="{{ url_for('web.get_cover', book_id=entry.id) }}" alt="{{ entry.title }}"/>
+              {{ image.book_cover(entry) }}
               {% if entry.id in read_book_ids %}<span class="badge read glyphicon glyphicon-ok"></span>{% endif %}
             </span>
           </a>

cps/templates/layout.html

@@ -1,4 +1,5 @@
 {% from 'modal_dialogs.html' import restrict_modal, delete_book, filechooser_modal, delete_confirm_modal, change_confirm_modal %}
+{% import 'image.html' as image %}
 <!DOCTYPE html>
 <html lang="{{ g.user.locale }}">
   <head>

cps/templates/schedule_edit.html

@@ -0,0 +1,39 @@
+{% extends "layout.html" %}
+{% block header %}
+<link href="{{ url_for('static', filename='css/libs/bootstrap-table.min.css') }}" rel="stylesheet">
+<link href="{{ url_for('static', filename='css/libs/bootstrap-editable.css') }}" rel="stylesheet">
+{% endblock %}
+{% block body %}
+<div class="discover">
+  <h1>{{title}}</h1>
+  <form role="form" class="col-md-10 col-lg-6" method="POST" autocomplete="off">
+    <input type="hidden" name="csrf_token" value="{{ csrf_token() }}">
+    <div class="form-group">
+      <label for="schedule_start_time">{{_('Time at which tasks start to run')}}</label>
+      <select name="schedule_start_time" id="schedule_start_time" class="form-control">
+        {% for n in range(24) %}
+          <option value="{{n}}" {% if config.schedule_start_time == n %}selected{% endif %}>{{n}}{{_(':00')}}</option>
+        {% endfor %}
+      </select>
+    </div>
+    <div class="form-group">
+      <label for="schedule_end_time">{{_('Time at which tasks stop running')}}</label>
+      <select name="schedule_end_time" id="schedule_end_time" class="form-control">
+        {% for n in range(24) %}
+          <option value="{{n}}" {% if config.schedule_end_time == n %}selected{% endif %}>{{n}}{{_(':00')}}</option>
+        {% endfor %}
+      </select>
+    </div>
+    <div class="form-group">
+      <input type="checkbox" id="schedule_generate_book_covers" name="schedule_generate_book_covers" {% if config.schedule_generate_book_covers %}checked{% endif %}>
+      <label for="schedule_generate_book_covers">{{_('Generate Book Cover Thumbnails')}}</label>
+    </div>
+    <div class="form-group">
+      <input type="checkbox" id="schedule_generate_series_covers" name="schedule_generate_series_covers" {% if config.schedule_generate_series_covers %}checked{% endif %}>
+      <label for="schedule_generate_series_covers">{{_('Generate Series Cover Thumbnails')}}</label>
+    </div>
+    <button type="submit" name="submit" value="submit" class="btn btn-default">{{_('Save')}}</button>
+    <a href="{{ url_for('admin.admin') }}" id="email_back" class="btn btn-default">{{_('Cancel')}}</a>
+  </form>
+</div>
+{% endblock %}

cps/templates/search.html

@@ -1,3 +1,4 @@
+{% import 'image.html' as image %}
 {% extends "layout.html" %}
 {% block body %}
 <div class="discover">
@@ -45,7 +46,7 @@
         {% if entry.Books.has_cover is defined %}
            <a href="{{ url_for('web.show_book', book_id=entry.Books.id) }}" data-toggle="modal" data-target="#bookDetailsModal" data-remote="false">
             <span class="img" title="{{entry.Books.title}}" >
-                <img src="{{ url_for('web.get_cover', book_id=entry.Books.id) }}" alt="{{ entry.Books.title }}" />
+                {{ image.book_cover(entry.Books) }}
                 {% if entry.Books.id in read_book_ids %}<span class="badge read glyphicon glyphicon-ok"></span>{% endif %}
             </span>
           </a>

cps/templates/shelf.html

@@ -1,3 +1,4 @@
+{% import 'image.html' as image %}
 {% extends "layout.html" %}
 {% block body %}
 <div class="discover">
@@ -34,7 +35,7 @@
       <div class="cover">
             <a href="{{ url_for('web.show_book', book_id=entry.id) }}" data-toggle="modal" data-target="#bookDetailsModal" data-remote="false">
               <span class="img" title="{{entry.title}}" >
-                <img src="{{ url_for('web.get_cover', book_id=entry.id) }}" alt="{{ entry.title }}" />
+                {{ image.book_cover(entry) }}
                 {% if entry.id in read_book_ids %}<span class="badge read glyphicon glyphicon-ok"></span>{% endif %}
               </span>
             </a>

cps/templates/tasks.html

@@ -16,6 +16,9 @@
             <th data-halign="right" data-align="right" data-field="progress" data-sortable="true" data-sorter="elementSorter">{{_('Progress')}}</th>
             <th data-halign="right" data-align="right" data-field="runtime" data-sortable="true" data-sort-name="rt">{{_('Run Time')}}</th>
             <th data-halign="right" data-align="right" data-field="starttime" data-sortable="true" data-sort-name="id">{{_('Start Time')}}</th>
+            {% if g.user.role_admin() %}
+            <th data-halign="right" data-align="right" data-formatter="TaskActions" data-switchable="false">{{_('Actions')}}</th>
+            {% endif %}
             <th data-field="id" data-visible="false"></th>
             <th data-field="rt" data-visible="false"></th>
         </tr>
@@ -23,6 +26,30 @@
     </table>
 </div>
 {% endblock %}
+{% block modal %}
+{{ delete_book() }}
+{% if g.user.role_admin() %}
+<div class="modal fade" id="cancelTaskModal" role="dialog" aria-labelledby="metaCancelTaskLabel">
+  <div class="modal-dialog">
+    <div class="modal-content">
+      <div class="modal-header bg-danger text-center">
+          <span>{{_('Are you really sure?')}}</span>
+      </div>
+        <div class="modal-body text-center">
+          <p>
+            <span>{{_('This task will be cancelled. Any progress made by this task will be saved.')}}</span>
+            <span>{{_('If this is a scheduled task, it will be re-ran during the next scheduled time.')}}</span>
+          </p>
+        </div>
+      <div class="modal-footer">
+        <input type="button" class="btn btn-danger" value="{{_('Ok')}}" name="cancel_task_confirm" id="cancel_task_confirm" data-dismiss="modal">
+        <button type="button" class="btn btn-default" data-dismiss="modal">{{_('Cancel')}}</button>
+      </div>
+    </div>
+  </div>
+</div>
+{% endif %}
+{% endblock %}
 {% block js %}
 <script src="{{ url_for('static', filename='js/libs/bootstrap-table/bootstrap-table.min.js') }}"></script>
 <script src="{{ url_for('static', filename='js/libs/bootstrap-table/bootstrap-table-locale-all.min.js') }}"></script>

cps/ub.py

@@ -17,6 +17,7 @@
 #  You should have received a copy of the GNU General Public License
 #  along with this program. If not, see <http://www.gnu.org/licenses/>.
 
+import atexit
 import os
 import sys
 import datetime
@@ -510,6 +511,28 @@ class RemoteAuthToken(Base):
         return '<Token %r>' % self.id
 
 
+def filename(context):
+    file_format = context.get_current_parameters()['format']
+    if file_format == 'jpeg':
+        return context.get_current_parameters()['uuid'] + '.jpg'
+    else:
+        return context.get_current_parameters()['uuid'] + '.' + file_format
+
+
+class Thumbnail(Base):
+    __tablename__ = 'thumbnail'
+
+    id = Column(Integer, primary_key=True)
+    entity_id = Column(Integer)
+    uuid = Column(String, default=lambda: str(uuid.uuid4()), unique=True)
+    format = Column(String, default='jpeg')
+    type = Column(SmallInteger, default=constants.THUMBNAIL_TYPE_COVER)
+    resolution = Column(SmallInteger, default=constants.COVER_THUMBNAIL_SMALL)
+    filename = Column(String, default=filename)
+    generated_at = Column(DateTime, default=lambda: datetime.datetime.utcnow())
+    expiration = Column(DateTime, nullable=True)
+
+
 # Add missing tables during migration of database
 def add_missing_tables(engine, _session):
     if not engine.dialect.has_table(engine.connect(), "book_read_link"):
@@ -524,6 +547,8 @@ def add_missing_tables(engine, _session):
         KoboStatistics.__table__.create(bind=engine)
     if not engine.dialect.has_table(engine.connect(), "archived_book"):
         ArchivedBook.__table__.create(bind=engine)
+    if not engine.dialect.has_table(engine.connect(), "thumbnail"):
+        Thumbnail.__table__.create(bind=engine)
     if not engine.dialect.has_table(engine.connect(), "registration"):
         Registration.__table__.create(bind=engine)
         with engine.connect() as conn:
@@ -829,6 +854,16 @@ def init_db(app_db_path):
             sys.exit(3)
 
 
+def get_new_session_instance():
+    new_engine = create_engine(u'sqlite:///{0}'.format(cli.settingspath), echo=False)
+    new_session = scoped_session(sessionmaker())
+    new_session.configure(bind=new_engine)
+
+    atexit.register(lambda: new_session.remove() if new_session else True)
+
+    return new_session
+
+
 def dispose():
     global session
 

cps/web.py

@@ -48,8 +48,8 @@ from . import constants, logger, isoLanguages, services
 from . import babel, db, ub, config, get_locale, app
 from . import calibre_db, kobo_sync_status
 from .gdriveutils import getFileFromEbooksFolder, do_gdrive_download
-from .helper import check_valid_domain, render_task_status, check_email, check_username, \
-    get_cc_columns, get_book_cover, get_download_link, send_mail, generate_random_password, \
+from .helper import check_valid_domain, render_task_status, check_email, check_username, get_cc_columns, \
+    get_book_cover, get_series_cover_thumbnail, get_download_link, send_mail, generate_random_password, \
     send_registration_mail, check_send_to_kindle, check_read_formats, tags_filters, reset_password, valid_email, \
     edit_book_read_status
 from .pagination import Pagination
@@ -128,7 +128,7 @@ def viewer_required(f):
 @web.route("/ajax/emailstat")
 @login_required
 def get_email_status_json():
-    tasks = WorkerThread.getInstance().tasks
+    tasks = WorkerThread.get_instance().tasks
     return jsonify(render_task_status(tasks))
 
 
@@ -761,6 +761,7 @@ def books_table():
     return render_title_template('book_table.html', title=_(u"Books List"), cc=cc, page="book_table",
                                  visiblility=visibility)
 
+
 @web.route("/ajax/listbooks")
 @login_required
 def list_books():
@@ -858,6 +859,7 @@ def list_books():
     response.headers["Content-Type"] = "application/json; charset=utf-8"
     return response
 
+
 @web.route("/ajax/table_settings", methods=['POST'])
 @login_required
 def update_table_settings():
@@ -937,6 +939,7 @@ def publisher_list():
         charlist = calibre_db.session.query(func.upper(func.substr(db.Publishers.name, 1, 1)).label('char')) \
             .join(db.books_publishers_link).join(db.Books).filter(calibre_db.common_filters()) \
             .group_by(func.upper(func.substr(db.Publishers.name, 1, 1))).all()
+
         return render_title_template('list.html', entries=entries, folder='web.books_list', charlist=charlist,
                                      title=_(u"Publishers"), page="publisherlist", data="publisher", order=order_no)
     else:
@@ -1066,7 +1069,7 @@ def category_list():
 @login_required
 def get_tasks_status():
     # if current user admin, show all email, otherwise only own emails
-    tasks = WorkerThread.getInstance().tasks
+    tasks = WorkerThread.get_instance().tasks
     answer = render_task_status(tasks)
     return render_title_template('tasks.html', entries=answer, title=_(u"Tasks"), page="tasks")
 
@@ -1395,7 +1398,8 @@ def render_adv_search_results(term, offset=None, order=None, limit=None):
                                  pagination=pagination,
                                  entries=entries,
                                  result_count=result_count,
-                                 title=_(u"Advanced Search"), page="advsearch",
+                                 title=_(u"Advanced Search"),
+                                 page="advsearch",
                                  order=order[1])
 
 
@@ -1411,14 +1415,38 @@ def advanced_search_form():
 
 
 @web.route("/cover/<int:book_id>")
+@web.route("/cover/<int:book_id>/<string:resolution>")
 @login_required_if_no_ano
-def get_cover(book_id):
-    return get_book_cover(book_id)
+def get_cover(book_id, resolution=None):
+    resolutions = {
+        'og': constants.COVER_THUMBNAIL_ORIGINAL,
+        'sm': constants.COVER_THUMBNAIL_SMALL,
+        'md': constants.COVER_THUMBNAIL_MEDIUM,
+        'lg': constants.COVER_THUMBNAIL_LARGE,
+    }
+    cover_resolution = resolutions.get(resolution, None)
+    return get_book_cover(book_id, cover_resolution)
+
+
+@web.route("/series_cover/<int:series_id>")
+@web.route("/series_cover/<int:series_id>/<string:resolution>")
+@login_required_if_no_ano
+def get_series_cover(series_id, resolution=None):
+    resolutions = {
+        'og': constants.COVER_THUMBNAIL_ORIGINAL,
+        'sm': constants.COVER_THUMBNAIL_SMALL,
+        'md': constants.COVER_THUMBNAIL_MEDIUM,
+        'lg': constants.COVER_THUMBNAIL_LARGE,
+    }
+    cover_resolution = resolutions.get(resolution, None)
+    return get_series_cover_thumbnail(series_id, cover_resolution)
+
 
 @web.route("/robots.txt")
 def get_robots():
     return send_from_directory(constants.STATIC_DIR, "robots.txt")
 
+
 @web.route("/show/<int:book_id>/<book_format>", defaults={'anyname': 'None'})
 @web.route("/show/<int:book_id>/<book_format>/<anyname>")
 @login_required_if_no_ano

requirements.txt

@@ -1,3 +1,4 @@
+APScheduler>=3.6.3,<3.8.0
 Babel>=1.3,<3.0
 Flask-Babel>=0.11.1,<2.1.0
 Flask-Login>=0.3.2,<0.5.1