added utility functions

model/src/utils/__init__.py

@@ -0,0 +1,3 @@
+from __future__ import annotations
+
+from .check_env import check_env

model/src/utils/check_env.py

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+"""Definition of check_env function."""
+from __future__ import annotations
+
+import os
+
+
+def check_env() -> None:
+    """Check necessary environment variables are set."""
+    necesasary_var_list = {
+        'MONGO_HOST',
+        'MONGO_DB',
+        'MONGO_COLLECTION',
+        'MONGO_USER',
+        'MONGO_PASSWORD',
+        'MINIO_ENDPOINT',
+        'MINIO_ACCESS_KEY',
+        'MINIO_SECRET_KEY',
+    }
+    for env_var in necesasary_var_list:
+        # ensure env var set
+        assert (
+            env_var in os.environ
+        ), (
+            f"environment variable not set: {env_var}"
+        )