Made long running tasks cancellable. Added cancel button to cancellable tasks in the task list. Added APP_MODE env variable for determining if the app is running in development, test, or production.

cps.py

@@ -44,7 +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_jobs, register_startup_jobs
+from cps.schedule import register_scheduled_tasks, register_startup_tasks
 
 try:
     from cps.kobo import kobo, get_kobo_activated
@@ -81,9 +81,9 @@ def main():
     if oauth_available:
         app.register_blueprint(oauth)
 
-    # Register scheduled jobs
+    # Register scheduled tasks
-    register_jobs()
+    register_scheduled_tasks()
-    # register_startup_jobs()
+    register_startup_tasks()
 
     success = web_server.start()
     sys.exit(0 if success else 1)

cps/admin.py

@@ -40,12 +40,13 @@ from sqlalchemy.orm.attributes import flag_modified
 from sqlalchemy.exc import IntegrityError, OperationalError, InvalidRequestError
 from sqlalchemy.sql.expression import func, or_, text
 
-from . import constants, logger, helper, services, isoLanguages, fs
+from . import constants, logger, helper, services, isoLanguages
-from . import db, calibre_db, ub, web_server, get_locale, config, updater_thread, babel, gdriveutils
+from . import db, calibre_db, ub, web_server, get_locale, config, updater_thread, babel, gdriveutils, 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
 
 try:
@@ -1568,7 +1569,7 @@ def update_mailsettings():
 @admin_required
 def edit_scheduledtasks():
     content = config.get_scheduled_task_settings()
-    return render_title_template("schedule_edit.html", content=content, title=_(u"Edit Scheduled Tasks Settings"))
+    return render_title_template("schedule_edit.html", config=content, title=_(u"Edit Scheduled Tasks Settings"))
 
 
 @admi.route("/admin/scheduledtasks", methods=["POST"])
@@ -1584,6 +1585,12 @@ def update_scheduledtasks():
     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")
@@ -1869,3 +1876,13 @@ 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/constants.py

@@ -24,10 +24,13 @@ 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'))
 
-#In executables updater is not available, so variable is set to False there
+# In executables updater is not available, so variable is set to False there
 UPDATER_AVAILABLE = True
 
 # Base dir is parent of current file, necessary if called from different folder
@@ -43,7 +46,7 @@ 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)
+CACHE_DIR           = os.environ.get('CACHE_DIR', DEFAULT_CACHE_DIR)
 
 if HOME_CONFIG:
     home_dir = os.path.join(os.path.expanduser("~"),".calibre-web")

cps/db.py

@@ -443,11 +443,11 @@ 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)
@@ -593,7 +593,7 @@ class CalibreDB():
                                                           autoflush=True,
                                                           bind=cls.engine))
         for inst in cls.instances:
-            inst.initSession()
+            inst.init_session()
 
         cls._init = True
         return True

cps/helper.py

@@ -57,7 +57,8 @@ from . import logger, config, get_locale, db, fs, ub
 from . import gdriveutils as gd
 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
 
@@ -838,12 +839,22 @@ 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
@@ -914,5 +925,5 @@ def get_download_link(book_id, book_format, client):
         abort(404)
 
 
-def clear_cover_thumbnail_cache(book_id=None):
+def clear_cover_thumbnail_cache(book_id):
     WorkerThread.add(None, TaskClearCoverThumbnailCache(book_id))

cps/schedule.py

@@ -17,29 +17,70 @@
 #   along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 from __future__ import division, print_function, unicode_literals
+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 register_jobs():
+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:
-        # Reconnect Calibre database (metadata.db)
+        # Remove all existing jobs
-        scheduler.schedule_task(user=None, task=lambda: TaskReconnectDatabase(), trigger='cron', hour='4,16')
+        scheduler.remove_all_jobs()
 
-        # Generate all missing book cover thumbnails
+        start = config.schedule_start_time
-        scheduler.schedule_task(user=None, task=lambda: TaskGenerateCoverThumbnails(), trigger='cron', hour=4)
+        end = config.schedule_end_time
 
-        # Generate all missing series thumbnails
+        # Register scheduled tasks
-        scheduler.schedule_task(user=None, task=lambda: TaskGenerateSeriesThumbnails(), trigger='cron', hour=4)
+        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
+        now = datetime.datetime.now().hour
+        if start <= now < end:
+            scheduler.schedule_tasks_immediately(tasks=get_scheduled_tasks(False))
 
 
-def register_startup_jobs():
+def register_startup_tasks():
     scheduler = BackgroundScheduler()
 
     if scheduler:
-        scheduler.schedule_task_immediately(None, task=lambda: TaskGenerateCoverThumbnails())
+        start = config.schedule_start_time
-        scheduler.schedule_task_immediately(None, task=lambda: TaskGenerateSeriesThumbnails())
+        end = config.schedule_end_time
+        now = datetime.datetime.now().hour
+
+        # 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 (start <= now < end):
+            scheduler.schedule_tasks_immediately(tasks=get_scheduled_tasks(False))

cps/services/background_scheduler.py

@@ -48,23 +48,38 @@ class BackgroundScheduler:
 
         return cls._instance
 
-    def _add(self, func, trigger, **trigger_args):
+    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, so that the task isn't instantiated before the task is scheduled
+    # Expects a lambda expression for the task
-    def schedule_task(self, user, task, trigger, **trigger_args):
+    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)
 
-            return self._add(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):
-    # Expects a lambda expression for the task, so that the task isn't instantiated before the task is scheduled
-    def schedule_task_immediately(self, user, task):
         if use_APScheduler:
-            def scheduled_task():
+            for task in tasks:
-                WorkerThread.add(user, task())
+                self.schedule_task(task, user=user, trigger=trigger, **trigger_args)
 
-            return self._add(func=scheduled_task, trigger='date')
+    # 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

@@ -21,6 +21,8 @@ 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
@@ -50,7 +52,7 @@ 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
@@ -67,12 +69,13 @@ 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,
         ))
@@ -134,6 +137,12 @@ class WorkerThread(threading.Thread):
 
             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
@@ -147,10 +156,11 @@ class CalibreTask:
         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
@@ -158,6 +168,11 @@ 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
@@ -208,7 +223,7 @@ 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):        
@@ -226,6 +241,14 @@ class CalibreTask:
     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, #ClearCacheDialog: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
 }
 
@@ -5237,6 +5237,10 @@ body.admin > div.container-fluid > div > div.col-sm-10 > div.container-fluid > d
     margin-bottom: 20px
 }
 
+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, #ClearCacheDialog, #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, #ClearCacheDialog: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, #ClearCacheDialog.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, #ClearCacheDialog > .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, #ClearCacheDialog > .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, #ClearCacheDialog > .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, #ClearCacheDialog > .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;
@@ -5559,12 +5563,12 @@ body.admin.modal-open .navbar {
     font-family: plex-icons-new, serif
 }
 
-#ClearCacheDialog > .modal-dialog > .modal-content > .modal-header:before {
+#deleteModal > .modal-dialog > .modal-content > .modal-header:before {
-    content: "\EA15";
+    content: "\EA6D";
     font-family: plex-icons-new, serif
 }
 
-#deleteModal > .modal-dialog > .modal-content > .modal-header:before {
+#cancelTaskModal > .modal-dialog > .modal-content > .modal-header:before {
     content: "\EA6D";
     font-family: plex-icons-new, serif
 }
@@ -5587,19 +5591,19 @@ body.admin.modal-open .navbar {
     font-size: 20px
 }
 
-#ClearCacheDialog > .modal-dialog > .modal-content > .modal-header:after {
-    content: "Clear Cover Thumbnail Cache";
-    display: inline-block;
-    font-size: 20px
-}
-
 #deleteModal > .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, #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
 }
 
@@ -5613,7 +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;
@@ -5623,17 +5627,7 @@ body.admin.modal-open .navbar {
     text-align: left
 }
 
-#ClearCacheDialog > .modal-dialog > .modal-content > .modal-body {
+#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 10px;
-    font-size: 16px;
-    line-height: 1.6em;
-    font-family: Open Sans Regular, Helvetica Neue, Helvetica, Arial, sans-serif;
-    color: #eee;
-    background: #282828;
-    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, #ClearCacheDialog > .modal-dialog > .modal-content > .modal-body > p, #deleteModal > .modal-dialog > .modal-content > .modal-body > p {
     padding: 20px 20px 0 0;
     font-size: 16px;
     line-height: 1.6em;
@@ -5642,7 +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), #ClearCacheDialog > .modal-dialog > .modal-content > .modal-body > .btn-default:not(#clear_cache), #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;
@@ -5678,11 +5672,11 @@ body.admin.modal-open .navbar {
     border-radius: 3px
 }
 
-#ClearCacheDialog > .modal-dialog > .modal-content > .modal-body > #clear_cache {
+#deleteModal > .modal-dialog > .modal-content > .modal-footer > .btn-danger {
     float: right;
     z-index: 9;
     position: relative;
-    margin: 25px 0 0 10px;
+    margin: 0 0 0 10px;
     min-width: 80px;
     padding: 10px 18px;
     font-size: 16px;
@@ -5690,7 +5684,7 @@ body.admin.modal-open .navbar {
     border-radius: 3px
 }
 
-#deleteModal > .modal-dialog > .modal-content > .modal-footer > .btn-danger {
+#cancelTaskModal > .modal-dialog > .modal-content > .modal-footer > .btn-danger {
     float: right;
     z-index: 9;
     position: relative;
@@ -5710,15 +5704,15 @@ body.admin.modal-open .navbar {
     margin: 55px 0 0 10px
 }
 
-#ClearCacheDialog > .modal-dialog > .modal-content > .modal-body > .btn-default:not(#clear_cache) {
-    margin: 25px 0 0 10px
-}
-
 #deleteModal > .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, #ClearCacheDialog > .modal-dialog > .modal-content > .modal-body > .btn-default:not(#clear_cache):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)
 }
 
@@ -5752,21 +5746,6 @@ body.admin.modal-open .navbar {
     box-shadow: 0 5px 15px rgba(0, 0, 0, .5)
 }
 
-#ClearCacheDialog > .modal-dialog > .modal-content > .modal-body:after {
-    content: '';
-    position: absolute;
-    width: 100%;
-    height: 72px;
-    background-color: #323232;
-    border-radius: 0 0 3px 3px;
-    left: 0;
-    margin-top: 10px;
-    z-index: 0;
-    border-top: 1px solid #222;
-    -webkit-box-shadow: 0 5px 15px rgba(0, 0, 0, .5);
-    box-shadow: 0 5px 15px rgba(0, 0, 0, .5)
-}
-
 #deleteButton {
     position: fixed;
     top: 60px;
@@ -7355,11 +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, #ClearCacheDialog > .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, #ClearCacheDialog > .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
     }
@@ -7509,7 +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, #ClearCacheDialog.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/main.js

@@ -454,18 +454,6 @@ $(function() {
             }
         });
     });
-    $("#clear_cache").click(function () {
-        $("#spinner3").show();
-        $.ajax({
-            dataType: "json",
-            url: window.location.pathname + "/../../clear-cache",
-            data: {"cache_type":"thumbnails"},
-            success: function(data) {
-                $("#spinner3").hide();
-                $("#ClearCacheDialog").modal("hide");
-            }
-        });
-    });
 
     // Init all data control handlers to default
     $("input[data-control]").trigger("change");

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;
@@ -576,6 +594,7 @@ function handle_header_buttons () {
         $(".header_select").removeAttr("disabled");
     }
 }
+
 /* Function for deleting domain restrictions */
 function TableActions (value, row) {
     return [
@@ -613,6 +632,19 @@ 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

@@ -234,3 +234,7 @@ class TaskConvert(CalibreTask):
     @property
     def name(self):
         return "Convert"
+
+    @property
+    def is_cancellable(self):
+        return False

cps/tasks/database.py

@@ -47,3 +47,7 @@ class TaskReconnectDatabase(CalibreTask):
     @property
     def name(self):
         return "Reconnect Database"
+
+    @property
+    def is_cancellable(self):
+        return False

cps/tasks/mail.py

@@ -162,7 +162,6 @@ class TaskEmail(CalibreTask):
             log.debug_or_exception(ex)
             self._handleError(u'Error sending e-mail: {}'.format(ex))
 
-
     def send_standard_email(self, msg):
         use_ssl = int(self.settings.get('mail_use_ssl', 0))
         timeout = 600  # set timeout to 5mins
@@ -218,7 +217,6 @@ class TaskEmail(CalibreTask):
             self.asyncSMTP = None
             self._progress = x
 
-
     @classmethod
     def _get_attachment(cls, bookpath, filename):
         """Get file as MIMEBase message"""
@@ -260,5 +258,9 @@ class TaskEmail(CalibreTask):
     def name(self):
         return "E-mail"
 
+    @property
+    def is_cancellable(self):
+        return False
+
     def __str__(self):
         return "{}, {}".format(self.name, self.subject)

cps/tasks/thumbnail.py

@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 
 #   This file is part of the Calibre-Web (https://github.com/janeczku/calibre-web)
-#     Copyright (C) 2020 mmonkey
+#     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
@@ -21,8 +21,8 @@ import os
 
 from .. import constants
 from cps import config, db, fs, gdriveutils, logger, ub
-from cps.services.worker import CalibreTask
+from cps.services.worker import CalibreTask, STAT_CANCELLED, STAT_ENDED
-from datetime import datetime, timedelta
+from datetime import datetime
 from sqlalchemy import func, text, or_
 
 try:
@@ -67,7 +67,7 @@ def get_best_fit(width, height, image_width, image_height):
 
 
 class TaskGenerateCoverThumbnails(CalibreTask):
-    def __init__(self, task_message=u'Generating cover thumbnails'):
+    def __init__(self, task_message=''):
         super(TaskGenerateCoverThumbnails, self).__init__(task_message)
         self.log = logger.create()
         self.app_db_session = ub.get_new_session_instance()
@@ -79,13 +79,14 @@ class TaskGenerateCoverThumbnails(CalibreTask):
         ]
 
     def run(self, worker_thread):
-        if self.calibre_db.session and use_IM:
+        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)
 
-            updated = 0
+            total_generated = 0
-            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
@@ -98,16 +99,32 @@ class TaskGenerateCoverThumbnails(CalibreTask):
                 # Replace outdated or missing thumbnails
                 for thumbnail in book_cover_thumbnails:
                     if book.last_modified > thumbnail.generated_at:
-                        updated += 1
+                        generated += 1
                         self.update_book_cover_thumbnail(book, thumbnail)
 
                     elif not self.cache.get_cache_file_exists(thumbnail.filename, constants.CACHE_TYPE_THUMBNAILS):
-                        updated += 1
+                        generated += 1
                         self.update_book_cover_thumbnail(book, thumbnail)
 
-                self.message = u'Processing book {0} of {1}'.format(i + 1, count)
+                # 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()
 
@@ -180,7 +197,8 @@ class TaskGenerateCoverThumbnails(CalibreTask):
                     self.log.info(u'Error generating thumbnail file: ' + str(ex))
                     raise ex
                 finally:
-                    stream.close()
+                    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):
@@ -197,11 +215,15 @@ class TaskGenerateCoverThumbnails(CalibreTask):
 
     @property
     def name(self):
-        return "ThumbnailsGenerate"
+        return 'GenerateCoverThumbnails'
+
+    @property
+    def is_cancellable(self):
+        return True
 
 
 class TaskGenerateSeriesThumbnails(CalibreTask):
-    def __init__(self, task_message=u'Generating series thumbnails'):
+    def __init__(self, task_message=''):
         super(TaskGenerateSeriesThumbnails, self).__init__(task_message)
         self.log = logger.create()
         self.app_db_session = ub.get_new_session_instance()
@@ -209,17 +231,18 @@ class TaskGenerateSeriesThumbnails(CalibreTask):
         self.cache = fs.FileSystem()
         self.resolutions = [
             constants.COVER_THUMBNAIL_SMALL,
-            constants.COVER_THUMBNAIL_MEDIUM
+            constants.COVER_THUMBNAIL_MEDIUM,
         ]
 
     def run(self, worker_thread):
-        if self.calibre_db.session and use_IM:
+        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)
 
-            updated = 0
+            total_generated = 0
-            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)
 
@@ -233,16 +256,32 @@ class TaskGenerateSeriesThumbnails(CalibreTask):
                 # Replace outdated or missing thumbnails
                 for thumbnail in series_thumbnails:
                     if any(book.last_modified > thumbnail.generated_at for book in series_books):
-                        updated += 1
+                        generated += 1
                         self.update_series_thumbnail(series_books, thumbnail)
 
                     elif not self.cache.get_cache_file_exists(thumbnail.filename, constants.CACHE_TYPE_THUMBNAILS):
-                        updated += 1
+                        generated += 1
                         self.update_series_thumbnail(series_books, thumbnail)
 
-                self.message = u'Processing series {0} of {1}'.format(i + 1, count)
+                # 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()
 
@@ -302,7 +341,8 @@ class TaskGenerateSeriesThumbnails(CalibreTask):
             self.app_db_session.rollback()
 
     def generate_series_thumbnail(self, series_books, thumbnail):
-        books = series_books[:4]
+        # 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
@@ -342,7 +382,8 @@ class TaskGenerateSeriesThumbnails(CalibreTask):
                         self.log.info(u'Error generating thumbnail file: ' + str(ex))
                         raise ex
                     finally:
-                        stream.close()
+                        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):
@@ -380,11 +421,15 @@ class TaskGenerateSeriesThumbnails(CalibreTask):
 
     @property
     def name(self):
-        return "SeriesThumbnailGenerate"
+        return 'GenerateSeriesThumbnails'
+
+    @property
+    def is_cancellable(self):
+        return True
 
 
 class TaskClearCoverThumbnailCache(CalibreTask):
-    def __init__(self, book_id=None, task_message=u'Clearing cover thumbnail cache'):
+    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
@@ -397,8 +442,6 @@ class TaskClearCoverThumbnailCache(CalibreTask):
                 thumbnails = self.get_thumbnails_for_book(self.book_id)
                 for thumbnail in thumbnails:
                     self.delete_thumbnail(thumbnail)
-            else:
-                self.delete_all_thumbnails()
 
         self._handleSuccess()
         self.app_db_session.remove()
@@ -411,19 +454,19 @@ class TaskClearCoverThumbnailCache(CalibreTask):
             .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))
 
-    def delete_all_thumbnails(self):
-        try:
-            self.cache.delete_cache_dir(constants.CACHE_TYPE_THUMBNAILS)
-        except Exception as ex:
-            self.log.info(u'Error deleting book thumbnails: ' + str(ex))
-            self._handleError(u'Error deleting book thumbnails: ' + str(ex))
-
     @property
     def name(self):
-        return "ThumbnailsClear"
+        return 'ThumbnailsClear'
+
+    @property
+    def is_cancellable(self):
+        return False

cps/tasks/upload.py

@@ -16,3 +16,7 @@ class TaskUpload(CalibreTask):
     @property
     def name(self):
         return "Upload"
+
+    @property
+    def is_cancellable(self):
+        return False

cps/templates/admin.html

@@ -159,7 +159,7 @@
   <div class="row">
     <div class="col">
       <h2>{{_('Scheduled Tasks')}}</h2>
-        <div class="col-xs-12 col-sm-12">
+        <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>

cps/templates/schedule_edit.html

@@ -11,7 +11,7 @@
       <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 content.schedule_start_time == n %}selected{% endif %}>{{n}}{{_(':00')}}</option>
+          <option value="{{n}}" {% if config.schedule_start_time == n %}selected{% endif %}>{{n}}{{_(':00')}}</option>
         {% endfor %}
       </select>
     </div>
@@ -19,12 +19,12 @@
       <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 content.schedule_end_time == n %}selected{% endif %}>{{n}}{{_(':00')}}</option>
+          <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" checked>
+      <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">

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/table.js') }}"></script>

cps/web.py

@@ -124,7 +124,7 @@ 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))
 
 
@@ -1055,7 +1055,7 @@ 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")