Tests pass... Feedback required.

securedrop_client/storage.py

@@ -47,13 +47,15 @@ def get_local_sources(session: Session) -> List[Source]:
     return session.query(Source).all()
 
 
-def delete_local_source_by_uuid(session: Session, uuid: str) -> Source:
+def delete_local_source_by_uuid(session: Session, uuid: str) -> None:
     """
-    Return the source with the referenced UUID.
+    Delete the source with the referenced UUID.
     """
-    source = session.query(Source).filter_by(uuid=uuid)
-    session.delete(source)
-    session.commit()
+    source = session.query(Source).filter_by(uuid=uuid).one_or_none()
+    if source:
+        session.delete(source)
+        session.commit()
+        logger.info("Deleted source with UUID {} from local database.".format(uuid))
 
 
 def get_local_messages(session: Session) -> List[Message]:

tests/test_logic.py

@@ -1271,10 +1271,12 @@ def test_Controller_on_delete_source_success(homedir, config, mocker, session_ma
     Using the `config` fixture to ensure the config is written to disk.
     '''
     mock_gui = mocker.MagicMock()
+    storage = mocker.patch('securedrop_client.logic.storage')
     co = Controller('http://localhost', mock_gui, session_maker, homedir)
-    co.sync_api = mocker.MagicMock()
-    co.on_delete_source_success(True)
-    co.sync_api.assert_called_with()
+    co.update_sources = mocker.MagicMock()
+    co.on_delete_source_success("uuid")
+    storage.delete_local_source_by_uuid.assert_called_once_with(co.session, "uuid")
+    assert co.update_sources.call_count == 1
 
 
 def test_Controller_on_delete_source_failure(homedir, config, mocker, session_maker):

tests/test_storage.py

@@ -17,7 +17,7 @@
     delete_single_submission_or_reply_on_disk, rename_file, get_local_files, find_new_files, \
     source_exists, set_message_or_reply_content, mark_as_downloaded, mark_as_decrypted, get_file, \
     get_message, get_reply, update_and_get_user, update_missing_files, mark_as_not_downloaded, \
-    mark_all_pending_drafts_as_failed
+    mark_all_pending_drafts_as_failed, delete_local_source_by_uuid
 
 from securedrop_client import db
 from tests import factory
@@ -72,6 +72,22 @@ def test_get_local_sources(mocker):
     mock_session.query.assert_called_once_with(securedrop_client.db.Source)
 
 
+def test_delete_local_source_by_uuid(mocker):
+    """
+    Delete the referenced source in the session.
+    """
+    mock_session = mocker.MagicMock()
+    source = make_remote_source()
+    mock_session.query().filter_by().one_or_none.return_value = source
+    mock_session.query.reset_mock()
+    delete_local_source_by_uuid(mock_session, "uuid")
+    mock_session.query.assert_called_once_with(securedrop_client.db.Source)
+    mock_session.query().filter_by.assert_called_once_with(uuid="uuid")
+    assert mock_session.query().filter_by().one_or_none.call_count == 1
+    mock_session.delete.assert_called_once_with(source)
+    mock_session.commit.assert_called_once_with()
+
+
 def test_get_local_messages(mocker):
     """
     At this moment, just return all messages.