runtime/wasmer: do not cache version in instance

lib/runtime/wasmer/exports.go

@@ -33,11 +33,6 @@ func (in *Instance) ValidateTransaction(e types.Extrinsic) (*transaction.Validit
 
 // Version calls runtime function Core_Version
 func (in *Instance) Version() (runtime.Version, error) {
-	// kusama seems to use the legacy version format
-	if in.version != nil {
-		return in.version, nil
-	}
-
 	res, err := in.exec(runtime.CoreVersion, []byte{})
 	if err != nil {
 		return nil, err
@@ -141,13 +136,6 @@ func (in *Instance) ExecuteBlock(block *types.Block) ([]byte, error) {
 		return nil, err
 	}
 
-	if in.version == nil {
-		in.version, err = in.Version()
-		if err != nil {
-			return nil, err
-		}
-	}
-
 	b.Header.Digest = types.NewDigest()
 
 	// remove seal digest only

lib/runtime/wasmer/imports.go

@@ -949,11 +949,9 @@ func ext_misc_runtime_version_version_1(context unsafe.Pointer, dataSpan C.int64
 		return 0
 	}
 
-	// instance version is set and cached in NewInstance
-	version := instance.version
-
-	if version == nil {
-		logger.Error("failed to get runtime version")
+	version, err := instance.Version()
+	if err != nil {
+		logger.Error("failed to get runtime version: %s", err)
 		out, _ := toWasmMemoryOptional(instanceContext, nil)
 		return C.int64_t(out)
 	}

lib/runtime/wasmer/instance.go

@@ -47,7 +47,6 @@ type Config struct {
 type Instance struct {
 	vm       wasm.Instance
 	ctx      *runtime.Context
-	version  runtime.Version
 	imports  func() (*wasm.Imports, error)
 	isClosed bool
 	codeHash common.Hash
@@ -162,7 +161,6 @@ func NewInstance(code []byte, cfg *Config) (*Instance, error) {
 		codeHash: cfg.CodeHash,
 	}
 
-	inst.version, _ = inst.Version()
 	return inst, nil
 }
 
@@ -196,12 +194,6 @@ func (in *Instance) UpdateRuntimeCode(code []byte) error {
 		return err
 	}
 
-	in.version = nil
-	in.version, err = in.Version()
-	if err != nil {
-		return err
-	}
-
 	return nil
 }