New environment db (#295)

* Filling out UserDB

* Abstract enforce get first

* Clearer argument - num_turns

* Using enums in DB

* Initial episode data model

* Update content loggers to use episode formatting

* Updating tables to work with testing

* Fixing some test changes

* Fixing small warnings that were noise during tests

* Moving default log path

* Test fix

* Correcting math thanks to Kurt

* Updating env DB classes to SQLAlchemy

* Name keys and Elems coded

* Adding arbitrary node attributes

* First complete pass of EnvDB

* Mypy fixings

* Fixing agents

* Writing some tests

* Finishing tests for object and room creates and queries

* Edge testing

* Arbitrary attributes testing

* Quests and testing

* And finally, DBGraph tests

* fixing episode change

* TODO function

* final mypy fixes

* DBID testing

* a -> either a or an depending on aeiou

light/data_model/db/base.py

@@ -104,6 +104,16 @@ def _enforce_get_first(self, session, stmt, error_text) -> Any:
             raise KeyError(error_text)
         return result
 
+    def file_path_exists(self, file_path: str) -> bool:
+        """
+        Determine if the given file path exists on this storage
+        """
+        if self.backend in ["test", "local"]:
+            full_path = os.path.join(self.file_root, file_path)
+            return os.path.exists(full_path)
+        else:
+            raise NotImplementedError
+
     def write_data_to_file(
         self, data: Union[str, Dict[str, Any]], filename: str, json_encode: bool = False
     ) -> None: