implement kill function for dl queue

tubearchivist/home/src/helper.py

@@ -88,6 +88,12 @@ def get_message(key):
     return json_str
 
 
+def del_message(key):
+    """delete key from redis"""
+    redis_connection = redis.Redis(host=REDIS_HOST)
+    redis_connection.execute_command("DEL", key)
+
+
 def get_dl_message(cache_dir):
     """get latest message if available"""
     redis_connection = redis.Redis(host=REDIS_HOST)

tubearchivist/home/tasks.py

@@ -9,7 +9,7 @@ import os
 from celery import Celery, shared_task
 from home.src.config import AppConfig
 from home.src.download import ChannelSubscription, PendingList, VideoDownloader
-from home.src.helper import RedisQueue, get_lock
+from home.src.helper import RedisQueue, del_message, get_lock, set_message
 from home.src.index_management import backup_all_indexes, restore_from_backup
 from home.src.reindex import ManualImport, reindex_old_documents
 
@@ -128,3 +128,25 @@ def run_restore_backup():
     """called from settings page, dump backup to zip file"""
     restore_from_backup()
     print("index restore finished")
+
+
+def kill_dl(task_id):
+    """kill download worker task by ID"""
+    app.control.revoke(task_id, terminate=True)
+    del_message("dl_queue_id")
+    RedisQueue("dl_queue").clear()
+
+    # clear cache
+    cache_dir = os.path.join(CONFIG["application"]["cache_dir"], "download")
+    for cached in os.listdir(cache_dir):
+        to_delete = os.path.join(cache_dir, cached)
+        os.remove(to_delete)
+
+    # notify
+    mess_dict = {
+        "status": "downloading",
+        "level": "error",
+        "title": "Brutally killing download queue",
+        "message": "",
+    }
+    set_message("progress:download", mess_dict)

tubearchivist/home/views.py

@@ -27,6 +27,7 @@ from home.tasks import (
     download_pending,
     download_single,
     extrac_dl,
+    kill_dl,
     run_backup,
     run_manual_import,
     run_restore_backup,
@@ -481,6 +482,7 @@ class PostData:
             "ignore": self.ignore,
             "dl_pending": self.dl_pending,
             "queue": self.queue_handler,
+            "kill_queue": self.kill_queue,
             "unsubscribe": self.unsubscribe,
             "sort_order": self.sort_order,
             "hide_watched": self.hide_watched,
@@ -520,7 +522,10 @@ class PostData:
     def dl_pending():
         """start the download queue"""
         print("download pending")
-        download_pending.delay()
+        running = download_pending.delay()
+        task_id = running.id
+        print("set task id: " + task_id)
+        set_message("dl_queue_id", task_id, expire=False)
         return {"success": True}
 
     def queue_handler(self):
@@ -532,6 +537,14 @@ class PostData:
 
         return {"success": True}
 
+    @staticmethod
+    def kill_queue():
+        """brutally murder the celery task"""
+        task_id = get_message("dl_queue_id")
+        print("brutally killing " + task_id)
+        kill_dl(task_id)
+        return {"success": True}
+
     def unsubscribe(self):
         """unsubscribe from channel"""
         channel_id_unsub = self.exec_val