3 files changed, 29 insertions, 10 deletions
diff --git a/app/AggroConfig.py b/app/AggroConfig.py
index 7e6a5f3..789fd6b 100644
--- a/app/AggroConfig.py
+++ b/app/AggroConfig.py
@@ -1,10 +1,12 @@
 from dataclasses import dataclass
 
+from app.PluginInterface import Params
+
 
 @dataclass
 class AggroConfig:
     server_host: str
     server_port: int
     db_path: str
-    plugins: dict[str, dict[str, str]]
+    plugins: dict[str, Params]
     graph: dict[str, list[str]]
diff --git a/app/PluginManager.py b/app/PluginManager.py
index 68149fd..fb6b4c3 100644
--- a/app/PluginManager.py
+++ b/app/PluginManager.py
@@ -6,7 +6,7 @@ from typing import Any
 from app.Item import Item
 from app.PluginInterface import Params, PluginInterface
 from app.AggroConfig import AggroConfig
-from app.utils import get_param
+from app.utils import get_config
 from app.MemoryState import memory_state
 
 
@@ -44,7 +44,7 @@ class PluginManager:
         for id in self.config.plugins:
             params: Params = self.config.plugins[id]
 
-            plugin_name = get_param("plugin", params)
+            plugin_name: str = get_config(params, "plugin")
             schedule_expr: str | None = params.get("schedule_expr", None)
 
             if plugin_name not in self._plugins:
diff --git a/app/utils.py b/app/utils.py
index 626ee24..f0c175f 100644
--- a/app/utils.py
+++ b/app/utils.py
@@ -1,19 +1,36 @@
+import os
 from datetime import datetime
-from typing import TypeAlias, Union
+from typing import Any, TypeAlias, Union
 from app.Item import Item
 from dataclasses import asdict
 
-from app.PluginInterface import Params
-
 ItemDictValue: TypeAlias = Union[str, dict[str, "ItemDictValue"], list["ItemDictValue"]]
 ItemDict: TypeAlias = dict[str, ItemDictValue]
 
 
-def get_param(key: str, params: Params) -> str:
-    if key not in params:
-        raise Exception(f"no {key} field in config entry: " + str(params))
+def evaluate_env_ref(v: Any) -> str:
+    if type(v) == str and v.startswith("${") and v.endswith("}"):
+        return os.environ[v[2:-1]]  # type: ignore
+    else:
+        return v
+
+
+def get_config(config: dict[str, Any], key: str) -> Any:
+    v: Any
+    try:
+        v = config[key]
+    except KeyError:
+        raise Exception(f"no {key} field in config: " + str(config))
+
+    return evaluate_env_ref(v)
+
+
+def get_config_or_default(
+    config: dict[str, Any], key: str, default: Any | None = None
+) -> Any:
+    v: Any = config.get(key, default)
 
-    return params[key]
+    return evaluate_env_ref(v)
 
 
 def item_to_dict(item: Item) -> ItemDict: