Agents need to better handle overloaded functions. Web3py does not resolve the function based on the number of args provided, so we need to resolve the function ourselves.

In some cases we've been lucky that the function we wanted to use was first to be returned instead of the other one, in which case the call will fail. This change makes the method to use more explicit by using the signature. Eventually the old function that was overloaded will be removed from the contract and is therefore no longer a problem - until then we need to properly/deterministically handle the overload case.

nucypher/blockchain/eth/agents.py

@@ -430,11 +430,14 @@ class TACoChildApplicationAgent(StakerSamplingApplicationAgent):
     def _get_active_staking_providers_raw(
         self, start_index: int, max_results: int
     ) -> Tuple[int, List[bytes]]:
-        active_staking_providers_info = (
-            self.contract.functions.getActiveStakingProviders(
-                start_index, max_results
-            ).call()
+        get_active_providers_overloaded_function = (
+            self.contract.get_function_by_signature(
+                "getActiveStakingProviders(uint256,uint256,uint32)"
+            )
         )
+        active_staking_providers_info = get_active_providers_overloaded_function(
+            start_index, max_results, 0  # TODO address via #3458
+        ).call()
         return active_staking_providers_info
 
 
@@ -638,7 +641,10 @@ class CoordinatorAgent(EthereumContractAgent):
     ) -> Iterable[Coordinator.Participant]:
         if max_results < 0:
             raise ValueError("Max results must be greater than or equal to zero.")
-        data = self.contract.functions.getParticipants(
+        get_participants_overloaded_function = self.contract.get_function_by_signature(
+            "getParticipants(uint32,uint256,uint256,bool)"
+        )
+        data = get_participants_overloaded_function(
             ritual_id, start_index, max_results, transcripts
         ).call()
         participants = Coordinator.Ritual.make_participants(data=data)