support optional_fields on getting meta data of probe / measurement

ripe/atlas/cousteau/api_meta_data.py

@@ -35,14 +35,15 @@ def __init__(self, **kwargs):
         self.meta_data = kwargs.get("meta_data")
         self._user_agent = kwargs.get("user_agent")
         self._fields = kwargs.get("fields")
+        self._optional_fields = kwargs.get("optional_fields")
         self.get_params = {}
 
         if self.meta_data is None and self.id is None:
             raise CousteauGenericError(
                 "Id or meta_data should be passed in order to create object."
             )
 
-        if self._fields:
+        if self._fields or self._optional_fields:
             self.update_get_params()
 
         if self.meta_data is None:
@@ -58,6 +59,11 @@ def update_get_params(self):
         elif isinstance(self._fields, str):
             self.get_params["fields"] = self._fields
 
+        if isinstance(self._optional_fields, (tuple, list)):  # tuples & lists > x,y,z
+            self.get_params["optional_fields"] = ",".join([str(_) for _ in self._optional_fields])
+        elif isinstance(self._optional_fields, str):
+            self.get_params["optional_fields"] = self._optional_fields
+
     def _fetch_meta_data(self):
         """Makes an API call to fetch meta data for the given probe and stores the raw data."""
         is_success, meta_data = AtlasRequest(