[AIC-py][editor] file path initialization

1. path is non-optional and has a default value
2. on init, create a new instance and save to the path if the file doesn't exist
(otherwise, try to load as usual)

Run server with and without explicit path. Observe in the logs
that, in either case, when the file doesn't exist it
gets created and written to.

Run again pointing at an existing valid path (e.g. the one just created).
Observe again in the logs that it loads from the path.

https://github.com/lastmile-ai/aiconfig/assets/148090348/ee24a0c0-84d8-47aa-b37f-bc9180948b4e

python/src/aiconfig/editor/server/server_utils.py

@@ -7,7 +7,7 @@
 from dataclasses import dataclass
 from enum import Enum
 from types import ModuleType
-from typing import Any, Callable, NewType, Optional, Type, TypeVar, cast
+from typing import Any, Callable, NewType, Type, TypeVar, cast
 
 import lastmile_utils.lib.core.api as core_utils
 import result
@@ -57,7 +57,7 @@ class ServerMode(Enum):
 
 class EditServerConfig(core_utils.Record):
     server_port: int = 8080
-    aiconfig_path: Optional[str] = None
+    aiconfig_path: str = "my_aiconfig.aiconfig.json"
     log_level: str | int = "INFO"
     server_mode: ServerMode
     parsers_module_path: str = "aiconfig_model_registry.py"
@@ -205,11 +205,10 @@ def init_server_state(app: Flask, edit_config: EditServerConfig) -> Result[None,
     state = get_server_state(app)
 
     assert state.aiconfig is None
-    if edit_config.aiconfig_path:
+    if os.path.exists(edit_config.aiconfig_path):
         LOGGER.info(f"Loading AIConfig from {edit_config.aiconfig_path}")
         val_path = get_validated_path(edit_config.aiconfig_path)
         aiconfig_runtime = val_path.and_then(safe_load_from_disk)
-        LOGGER.debug(f"{aiconfig_runtime.is_ok()=}")
         match aiconfig_runtime:
             case Ok(aiconfig_runtime_):
                 state.aiconfig = aiconfig_runtime_
@@ -219,14 +218,22 @@ def init_server_state(app: Flask, edit_config: EditServerConfig) -> Result[None,
                 LOGGER.error(f"Failed to load AIConfig from {edit_config.aiconfig_path}: {e}")
                 return Err(f"Failed to load AIConfig from {edit_config.aiconfig_path}: {e}")
     else:
+        LOGGER.info(f"Creating new AIConfig at {edit_config.aiconfig_path}")
         aiconfig_runtime = AIConfigRuntime.create()  # type: ignore
         model_ids = ModelParserRegistry.parser_ids()
         if len(model_ids) > 0:
             aiconfig_runtime.add_prompt("prompt_1", Prompt(name="prompt_1", input="", metadata=PromptMetadata(model=model_ids[0])))
 
         state.aiconfig = aiconfig_runtime
         LOGGER.info("Created new AIConfig")
-        return Ok(None)
+        try:
+            aiconfig_runtime.save(edit_config.aiconfig_path)
+            LOGGER.info(f"Saved new AIConfig to {edit_config.aiconfig_path}")
+            state.aiconfig = aiconfig_runtime
+            return Ok(None)
+        except Exception as e:
+            LOGGER.error(f"Failed to create new AIConfig at {edit_config.aiconfig_path}: {e}")
+            return core_utils.ErrWithTraceback(e)
 
 
 def _safe_run_aiconfig_method(aiconfig: AIConfigRuntime, method_name: MethodName, method_args: OpArgs) -> Result[None, str]: