daemon: refactoring to load emane models one time during startup, updates to account for this change

daemon/core/emane/modelmanager.py

@@ -0,0 +1,41 @@
+import logging
+from pathlib import Path
+from typing import Dict, List, Type
+
+from core import utils
+from core.emane.emanemodel import EmaneModel
+from core.errors import CoreError
+
+logger = logging.getLogger(__name__)
+
+
+class EmaneModelManager:
+    models: Dict[str, Type[EmaneModel]] = {}
+
+    @classmethod
+    def load(cls, path: Path, prefix: Path) -> List[str]:
+        """
+        Load EMANE models and make them available.
+        """
+        subdirs = [x for x in path.iterdir() if x.is_dir()]
+        subdirs.append(path)
+        errors = []
+        for subdir in subdirs:
+            logger.debug("loading emane models from: %s", subdir)
+            models = utils.load_classes(subdir, EmaneModel)
+            for model in models:
+                logger.debug("loading emane model: %s", model.name)
+                try:
+                    model.load(prefix)
+                    cls.models[model.name] = model
+                except CoreError as e:
+                    errors.append(model.name)
+                    logger.debug("not loading service(%s): %s", model.name, e)
+        return errors
+
+    @classmethod
+    def get(cls, name: str) -> Type[EmaneModel]:
+        model = cls.models.get(name)
+        if model is None:
+            raise CoreError(f"emame model does not exist {name}")
+        return model