Download manager: Set initial state on get status

Otherwise the UI will attempt a new download in the next session after
the download is complete.

Helps #863

kolibri_explore_plugin/collectionviews.py

@@ -240,6 +240,12 @@ def _set_empty_state(self):
  self._enqueuing_timestamp = None
  self._enqueued_timestamp = None
 
+ def is_state_unset(self):
+ return (
+ self._stage == DownloadStage.NOT_STARTED
+ and self._content_manifest is None
+ )
+
  def start(self, manifest, user):
  """Start downloading a collection manifest."""
  if self._stage != DownloadStage.NOT_STARTED:
@@ -265,6 +271,12 @@ def from_state(self, state):
  self._tasks_completed = state["tasks_completed"]
  self._tasks_previously_completed = state["tasks_previously_completed"]
 
+ logger.info(
+ f"Download state loaded for grade={grade} name={name}, "
+ + f"stage={stage_name}"
+ )
+ logger.debug(f"Loaded download state: {state}")
+
  def cancel(self):
  if self._current_job_id is not None:
  job_storage.cancel(self._current_job_id)
@@ -733,5 +745,13 @@ def cancel_download(request):
 @api_view(["GET"])
 def get_download_status(request):
  """Return the download status."""
+
+ saved_state = request.session.get("COLLECTIONS_STATE")
+ if (
+ _collection_download_manager.is_state_unset()
+ and saved_state is not None
+ ):
+ _collection_download_manager.from_state(saved_state)
+
  status = _collection_download_manager.get_status()
  return Response({"status": status})