#2913: Initial commit of new AbstractReward class.

src/primaite/game/agent/rewards.py

@@ -27,9 +27,10 @@ the structure:
                 service_ref: web_server_database_client
 ```
 """
-from abc import abstractmethod
-from typing import Callable, Dict, Iterable, List, Optional, Tuple, Type, TYPE_CHECKING, Union
+from abc import ABC, abstractmethod
+from typing import Any, Callable, Dict, Iterable, List, Optional, Tuple, Type, TYPE_CHECKING, Union
 
+from pydantic import BaseModel
 from typing_extensions import Never
 
 from primaite import getLogger
@@ -42,9 +43,35 @@ _LOGGER = getLogger(__name__)
 WhereType = Optional[Iterable[Union[str, int]]]
 
 
-class AbstractReward:
+class AbstractReward(BaseModel):
     """Base class for reward function components."""
 
+    class ConfigSchema(BaseModel, ABC):
+        """Config schema for AbstractReward."""
+
+        type: str
+
+    def __init_subclass__(cls, identifier: str, **kwargs: Any) -> None:
+        super().__init_subclass__(**kwargs)
+        if identifier in cls._registry:
+            raise ValueError(f"Duplicate node adder {identifier}")
+        cls._registry[identifier] = cls
+
+    @classmethod
+    @abstractmethod
+    def from_config(cls, config: Dict) -> "AbstractReward":
+        """Create a reward function component from a config dictionary.
+
+        :param config: dict of options for the reward component's constructor
+        :type config: dict
+        :return: The reward component.
+        :rtype: AbstractReward
+        """
+        if config["type"] not in cls._registry:
+            raise ValueError(f"Invalid reward type {config['type']}")
+
+        return cls
+
     @abstractmethod
     def calculate(self, state: Dict, last_action_response: "AgentHistoryItem") -> float:
         """Calculate the reward for the current state.
@@ -58,21 +85,9 @@ class AbstractReward:
         """
         return 0.0
 
-    @classmethod
-    @abstractmethod
-    def from_config(cls, config: dict) -> "AbstractReward":
-        """Create a reward function component from a config dictionary.
 
-        :param config: dict of options for the reward component's constructor
-        :type config: dict
-        :return: The reward component.
-        :rtype: AbstractReward
-        """
-        return cls()
-
-
-class DummyReward(AbstractReward):
-    """Dummy reward function component which always returns 0."""
+class DummyReward(AbstractReward, identifier="DummyReward"):
+    """Dummy reward function component which always returns 0.0"""
 
     def calculate(self, state: Dict, last_action_response: "AgentHistoryItem") -> float:
         """Calculate the reward for the current state.
@@ -98,7 +113,7 @@ class DummyReward(AbstractReward):
         return cls()
 
 
-class DatabaseFileIntegrity(AbstractReward):
+class DatabaseFileIntegrity(AbstractReward, identifier="DatabaseFileIntegrity"):
     """Reward function component which rewards the agent for maintaining the integrity of a database file."""
 
     def __init__(self, node_hostname: str, folder_name: str, file_name: str) -> None:
@@ -168,7 +183,7 @@ class DatabaseFileIntegrity(AbstractReward):
         return cls(node_hostname=node_hostname, folder_name=folder_name, file_name=file_name)
 
 
-class WebServer404Penalty(AbstractReward):
+class WebServer404Penalty(AbstractReward, identifier="WebServer404Penalty"):
     """Reward function component which penalises the agent when the web server returns a 404 error."""
 
     def __init__(self, node_hostname: str, service_name: str, sticky: bool = True) -> None:
@@ -241,7 +256,7 @@ class WebServer404Penalty(AbstractReward):
         return cls(node_hostname=node_hostname, service_name=service_name, sticky=sticky)
 
 
-class WebpageUnavailablePenalty(AbstractReward):
+class WebpageUnavailablePenalty(AbstractReward, identifier="WebpageUnavailablePenalty"):
     """Penalises the agent when the web browser fails to fetch a webpage."""
 
     def __init__(self, node_hostname: str, sticky: bool = True) -> None:
@@ -325,7 +340,7 @@ class WebpageUnavailablePenalty(AbstractReward):
         return cls(node_hostname=node_hostname, sticky=sticky)
 
 
-class GreenAdminDatabaseUnreachablePenalty(AbstractReward):
+class GreenAdminDatabaseUnreachablePenalty(AbstractReward, identifier="GreenAdminDatabaseUnreachablePenalty"):
     """Penalises the agent when the green db clients fail to connect to the database."""
 
     def __init__(self, node_hostname: str, sticky: bool = True) -> None:
@@ -393,7 +408,7 @@ class GreenAdminDatabaseUnreachablePenalty(AbstractReward):
         return cls(node_hostname=node_hostname, sticky=sticky)
 
 
-class SharedReward(AbstractReward):
+class SharedReward(AbstractReward, identifier="SharedReward"):
     """Adds another agent's reward to the overall reward."""
 
     def __init__(self, agent_name: Optional[str] = None) -> None:
@@ -446,7 +461,7 @@ class SharedReward(AbstractReward):
         return cls(agent_name=agent_name)
 
 
-class ActionPenalty(AbstractReward):
+class ActionPenalty(AbstractReward, identifier="ActionPenalty"):
     """Apply a negative reward when taking any action except DONOTHING."""
 
     def __init__(self, action_penalty: float, do_nothing_penalty: float) -> None: