Replace django-background-tasks with huey (#657)

* Replace django-background-tasks with huey

* Add command for migrating tasks

* Add custom admin view

* fix dockerfile

* fix tests

* fix tests in CI

* fix task tests

* implement retries

* improve config

* workaround to avoid running singlefile tasks in parallel

* properly kill single-file sub-processes

* use period task for HTML snapshots

* clear task lock when starting task consumer

* remove obsolete cleanup task command

bookmarks/management/commands/migrate_tasks.py

@@ -0,0 +1,75 @@
+import json
+import os
+import sqlite3
+import importlib
+
+from django.core.management.base import BaseCommand
+
+
+class Command(BaseCommand):
+    help = "Migrate tasks from django-background-tasks to Huey"
+
+    def handle(self, *args, **options):
+        db = sqlite3.connect(os.path.join("data", "db.sqlite3"))
+
+        # Check if background_task table exists
+        cursor = db.cursor()
+        cursor.execute(
+            "SELECT name FROM sqlite_master WHERE type='table' AND name='background_task'"
+        )
+        row = cursor.fetchone()
+        if not row:
+            self.stdout.write(
+                "Legacy task table does not exist. Skipping task migration"
+            )
+            return
+
+        # Load legacy tasks
+        cursor.execute("SELECT id, task_name, task_params FROM background_task")
+        legacy_tasks = cursor.fetchall()
+
+        if len(legacy_tasks) == 0:
+            self.stdout.write("No legacy tasks found. Skipping task migration")
+            return
+
+        self.stdout.write(
+            f"Found {len(legacy_tasks)} legacy tasks. Migrating to Huey..."
+        )
+
+        # Migrate tasks to Huey
+        succeeded_tasks = []
+        for task in legacy_tasks:
+            task_id = task[0]
+            task_name = task[1]
+            task_params_json = task[2]
+            try:
+                task_params = json.loads(task_params_json)
+                function_params = task_params[0]
+
+                # Resolve task function
+                module_name, func_name = task_name.rsplit(".", 1)
+                module = importlib.import_module(module_name)
+                func = getattr(module, func_name)
+
+                # Call task function
+                func(*function_params)
+                succeeded_tasks.append(task_id)
+            except Exception:
+                self.stderr.write(f"Error migrating task [{task_id}] {task_name}")
+
+        self.stdout.write(f"Migrated {len(succeeded_tasks)} tasks successfully")
+
+        # Clean up
+        try:
+            placeholders = ", ".join("?" for _ in succeeded_tasks)
+            sql = f"DELETE FROM background_task WHERE id IN ({placeholders})"
+            cursor.execute(sql, succeeded_tasks)
+            db.commit()
+            self.stdout.write(
+                f"Deleted {len(succeeded_tasks)} migrated tasks from legacy table"
+            )
+        except Exception:
+            self.stderr.write("Error cleaning up legacy tasks")
+
+        cursor.close()
+        db.close()