#150: Allow backends to be created for testing purposes

- Currently getting a 403 on these changes but I'm not sure the code is at fault...

common/backends.py

@@ -4,12 +4,19 @@
 from common.config import config
 import sys
 
-backend_type = config.get_backend_type()
-
-if backend_type == "db":
-    backend = DatabaseBackend()
-elif backend_type == "python_icat":
-    backend = PythonICATBackend()
-else:
-    sys.exit(f"Invalid config value '{backend_type}' for config option backend")
-    backend = Backend()
+
+def create_backend(backend_type):
+    """
+    TODO - Add docstring
+    """
+
+    if backend_type == "db":
+        backend = DatabaseBackend()
+    elif backend_type == "python_icat":
+        backend = PythonICATBackend()
+    else:
+        # Might turn to a warning so the abstract class can be tested?
+        sys.exit(f"Invalid config value '{backend_type}' for config option backend")
+        backend = Backend()
+
+    return backend

src/resources/entities/entity_endpoint.py

@@ -5,7 +5,11 @@
     get_session_id_from_auth_header,
     get_filters_from_query_string,
 )
-from common.backends import backend
+from common.backends import create_backend
+from common.config import config
+
+
+backend = create_backend(config.get_backend_type())
 
 
 def get_endpoint(name, table):

src/resources/non_entities/sessions_endpoints.py

@@ -11,11 +11,13 @@
 )
 from common.helpers import get_session_id_from_auth_header
 from common.models.db_models import SESSION
-from common.backends import backend
+from common.backends import create_backend
 from common.exceptions import AuthenticationError
+from common.config import config
 
 log = logging.getLogger()
 
+backend = create_backend(config.get_backend_type())
 
 class Sessions(Resource):
     def post(self):

src/resources/table_endpoints/table_endpoints.py

@@ -10,7 +10,10 @@
     get_session_id_from_auth_header,
     get_filters_from_query_string,
 )
-from common.backends import backend
+from common.backends import create_backend
+from common.config import config
+
+backend = create_backend(config.get_backend_type())
 
 
 class InstrumentsFacilityCycles(Resource):