update spec builder for electra execution engine

pysetup/spec_builders/electra.py

@@ -8,16 +8,53 @@ class ElectraSpecBuilder(BaseSpecBuilder):
 
     @classmethod
     def imports(cls, preset_name: str):
-        return f'''
+        return f"""
 from eth2spec.deneb import {preset_name} as deneb
-'''
+"""
 
-## TODO: deal with changed gindices
+    @classmethod
+    def execution_engine_cls(cls) -> str:
+        return """
+class NoopExecutionEngine(ExecutionEngine):
+
+    def notify_new_payload(self: ExecutionEngine,
+                           execution_payload: ExecutionPayload,
+                           parent_beacon_block_root: Root,
+                           max_blobs_per_block: uint64) -> bool:
+        return True
+
+    def notify_forkchoice_updated(self: ExecutionEngine,
+                                  head_block_hash: Hash32,
+                                  safe_block_hash: Hash32,
+                                  finalized_block_hash: Hash32,
+                                  payload_attributes: Optional[PayloadAttributes]) -> Optional[PayloadId]:
+        pass
+
+    def get_payload(self: ExecutionEngine, payload_id: PayloadId) -> GetPayloadResponse:
+        # pylint: disable=unused-argument
+        raise NotImplementedError("no default block production")
+
+    def is_valid_block_hash(self: ExecutionEngine,
+                            execution_payload: ExecutionPayload,
+                            parent_beacon_block_root: Root) -> bool:
+        return True
+
+    def is_valid_versioned_hashes(self: ExecutionEngine, new_payload_request: NewPayloadRequest) -> bool:
+        return True
+
+    def verify_and_notify_new_payload(self: ExecutionEngine,
+                                      new_payload_request: NewPayloadRequest) -> bool:
+        return True
+
+
+EXECUTION_ENGINE = NoopExecutionEngine()"""
+
+    ## TODO: deal with changed gindices
 
     @classmethod
     def hardcoded_ssz_dep_constants(cls) -> Dict[str, str]:
         return {
-            'FINALIZED_ROOT_GINDEX': 'GeneralizedIndex(169)',
-            'CURRENT_SYNC_COMMITTEE_GINDEX': 'GeneralizedIndex(86)',
-            'NEXT_SYNC_COMMITTEE_GINDEX': 'GeneralizedIndex(87)',
+            "FINALIZED_ROOT_GINDEX": "GeneralizedIndex(169)",
+            "CURRENT_SYNC_COMMITTEE_GINDEX": "GeneralizedIndex(86)",
+            "NEXT_SYNC_COMMITTEE_GINDEX": "GeneralizedIndex(87)",
         }