Fixed #35859 -- Added background Tasks framework interface.

This work implements what was defined in DEP 14
(https://github.com/django/deps/blob/main/accepted/0014-background-workers.rst).

Thanks to Raphael Gaschignard, Eric Holscher, Ran Benita, Sarah Boyce,
Jacob Walls, and Natalia Bidart for the reviews.

1 files changed, 45 insertions, 0 deletions

diff --git a/django/tasks/__init__.py b/django/tasks/__init__.py
new file mode 100644
index 0000000000..ae7ae8dd7c
--- /dev/null
+++ b/django/tasks/__init__.py
@@ -0,0 +1,45 @@
+from django.utils.connection import BaseConnectionHandler, ConnectionProxy
+from django.utils.module_loading import import_string
+
+from . import checks, signals  # NOQA
+from .base import (
+    DEFAULT_TASK_BACKEND_ALIAS,
+    DEFAULT_TASK_QUEUE_NAME,
+    Task,
+    TaskContext,
+    TaskResult,
+    TaskResultStatus,
+    task,
+)
+from .exceptions import InvalidTaskBackend
+
+__all__ = [
+    "DEFAULT_TASK_BACKEND_ALIAS",
+    "DEFAULT_TASK_QUEUE_NAME",
+    "default_task_backend",
+    "task",
+    "task_backends",
+    "Task",
+    "TaskContext",
+    "TaskResult",
+    "TaskResultStatus",
+]
+
+
+class TaskBackendHandler(BaseConnectionHandler):
+    settings_name = "TASKS"
+    exception_class = InvalidTaskBackend
+
+    def create_connection(self, alias):
+        params = self.settings[alias]
+        backend = params["BACKEND"]
+        try:
+            backend_cls = import_string(backend)
+        except ImportError as e:
+            raise InvalidTaskBackend(f"Could not find backend '{backend}': {e}") from e
+        return backend_cls(alias=alias, params=params)
+
+
+task_backends = TaskBackendHandler()
+
+default_task_backend = ConnectionProxy(task_backends, DEFAULT_TASK_BACKEND_ALIAS)