Start introducing RequestResponse

src/primaite/interface/request.py

@@ -0,0 +1,29 @@
+from typing import Dict, Literal
+
+from pydantic import BaseModel, ConfigDict
+
+
+class RequestResponse(BaseModel):
+    """Schema for generic request responses."""
+
+    model_config = ConfigDict(extra="forbid")
+    """Cannot have extra fields in the response. Anything custom goes into the data field."""
+
+    status: Literal["pending", "success", "failure"] = "pending"
+    """
+    What is the current status of the request:
+        - pending - the request has not been received yet, or it has been received but it's still being processed.
+        - success - the request has successfully been received and processed.
+        - failure - the request could not reach it's intended target or it was rejected.
+
+        Note that the failure status should only be used when the request cannot be processed, for instance when the
+        target SimComponent doesn't exist, or is in an OFF state that prevents it from accepting requests. If the
+        request is received by the target and the associated action is executed, but couldn't be completed due to
+        downstream factors, the request was still successfully received, it's just that the result wasn't what was
+        intended.
+    """
+
+    data: Dict = {}
+    """Catch-all place to provide any additional data that was generated as a response to the request."""
+    # TODO: currently, status and data have default values, because I don't want to interrupt existing functionality too
+    # much. However, in the future we might consider making them mandatory.

src/primaite/simulator/core.py

@@ -1,12 +1,13 @@
 # flake8: noqa
 """Core of the PrimAITE Simulator."""
 from abc import abstractmethod
-from typing import Callable, Dict, List, Optional, Union
+from typing import Callable, Dict, List, Literal, Optional, Union
 from uuid import uuid4
 
-from pydantic import BaseModel, ConfigDict, Field
+from pydantic import BaseModel, ConfigDict, Field, validate_call
 
 from primaite import getLogger
+from primaite.interface.request import RequestResponse
 
 _LOGGER = getLogger(__name__)
 
@@ -22,7 +23,7 @@ class RequestPermissionValidator(BaseModel):
 
     @abstractmethod
     def __call__(self, request: List[str], context: Dict) -> bool:
-        """Use the request and context paramters to decide whether the request should be permitted."""
+        """Use the request and context parameters to decide whether the request should be permitted."""
         pass
 
 
@@ -42,7 +43,7 @@ class RequestType(BaseModel):
     the request can be performed or not.
     """
 
-    func: Callable[[List[str], Dict], None]
+    func: Callable[[List[str], Dict], RequestResponse]
     """
     ``func`` is a function that accepts a request and a context dict. Typically this would be a lambda function
     that invokes a class method of your SimComponent. For example if the component is a node and the request type is for
@@ -71,7 +72,8 @@ class RequestManager(BaseModel):
     request_types: Dict[str, RequestType] = {}
     """maps request name to an RequestType object."""
 
-    def __call__(self, request: Callable[[List[str], Dict], None], context: Dict) -> None:
+    @validate_call
+    def __call__(self, request: List[str], context: Dict) -> RequestResponse:
         """
         Process an request request.
 
@@ -84,23 +86,25 @@ class RequestManager(BaseModel):
         :raises RuntimeError: If the request parameter does not have a valid request name as the first item.
         """
         request_key = request[0]
+        request_options = request[1:]
 
         if request_key not in self.request_types:
             msg = (
                 f"Request {request} could not be processed because {request_key} is not a valid request name",
                 "within this RequestManager",
             )
-            _LOGGER.error(msg)
-            raise RuntimeError(msg)
+            # _LOGGER.error(msg)
+            # raise RuntimeError(msg)
+            _LOGGER.debug(msg)
+            return RequestResponse(status="failure", data={"reason": msg})
 
         request_type = self.request_types[request_key]
-        request_options = request[1:]
 
         if not request_type.validator(request_options, context):
             _LOGGER.debug(f"Request {request} was denied due to insufficient permissions")
-            return
+            return RequestResponse(status="failure", data={"reason": "request validation failed"})
 
-        request_type.func(request_options, context)
+        return request_type.func(request_options, context)
 
     def add_request(self, name: str, request_type: RequestType) -> None:
         """

src/primaite/simulator/domain/controller.py

@@ -87,6 +87,7 @@ class DomainController(SimComponent):
             "account",
             RequestType(
                 func=lambda request, context: self.accounts[request.pop(0)].apply_request(request, context),
+                # TODO: not sure what should get returned here, revisit
                 validator=GroupMembershipValidator(allowed_groups=[AccountGroup.DOMAIN_ADMIN]),
             ),
         )

src/primaite/simulator/sim_container.py

@@ -1,5 +1,6 @@
 from typing import Dict
 
+from primaite.interface.request import RequestResponse
 from primaite.simulator.core import RequestManager, RequestType, SimComponent
 from primaite.simulator.domain.controller import DomainController
 from primaite.simulator.network.container import Network
@@ -31,7 +32,8 @@ class Simulation(SimComponent):
         rm.add_request("network", RequestType(func=self.network._request_manager))
         # pass through domain requests to the domain object
         rm.add_request("domain", RequestType(func=self.domain._request_manager))
-        rm.add_request("do_nothing", RequestType(func=lambda request, context: ()))
+        # if 'do_nothing' is requested, just return a success
+        rm.add_request("do_nothing", RequestType(func=lambda request, context: RequestResponse(status="success")))
         return rm
 
     def describe_state(self) -> Dict: