fixed "missing host function" bug (#225)

* Recovered WasmExecutor for the EVM template

evm-template/node/src/service.rs

@@ -27,7 +27,7 @@ use parachain_template_runtime::{
 };
 use sc_client_api::Backend;
 use sc_consensus::ImportQueue;
-use sc_executor::NativeElseWasmExecutor;
+use sc_executor::WasmExecutor;
 use sc_network::NetworkBlock;
 use sc_network_sync::SyncingService;
 use sc_service::{Configuration, PartialComponents, TFullBackend, TFullClient, TaskManager};
@@ -42,22 +42,18 @@ use crate::eth::{
     FrontierBackend, FrontierPartialComponents,
 };
 
-/// Native executor type.
-pub struct ParachainNativeExecutor;
+#[cfg(not(feature = "runtime-benchmarks"))]
+type HostFunctions =
+    (sp_io::SubstrateHostFunctions, cumulus_client_service::storage_proof_size::HostFunctions);
 
-impl sc_executor::NativeExecutionDispatch for ParachainNativeExecutor {
-    type ExtendHostFunctions = frame_benchmarking::benchmarking::HostFunctions;
+#[cfg(feature = "runtime-benchmarks")]
+type HostFunctions = (
+    sp_io::SubstrateHostFunctions,
+    cumulus_client_service::storage_proof_size::HostFunctions,
+    frame_benchmarking::benchmarking::HostFunctions,
+);
 
-    fn dispatch(method: &str, data: &[u8]) -> Option<Vec<u8>> {
-        parachain_template_runtime::apis::api::dispatch(method, data)
-    }
-
-    fn native_version() -> sc_executor::NativeVersion {
-        parachain_template_runtime::native_version()
-    }
-}
-
-type ParachainExecutor = NativeElseWasmExecutor<ParachainNativeExecutor>;
+type ParachainExecutor = WasmExecutor<HostFunctions>;
 
 type ParachainClient = TFullClient<Block, RuntimeApi, ParachainExecutor>;
 
@@ -100,7 +96,7 @@ pub fn new_partial(
         })
         .transpose()?;
 
-    let executor = sc_service::new_native_or_wasm_executor(config);
+    let executor = sc_service::new_wasm_executor(config);
 
     let (client, backend, keystore_container, task_manager) =
         sc_service::new_full_parts_record_import::<Block, RuntimeApi, _>(