Otto.ToValue concurrency error fixed

jsre/jsre.go

@@ -286,7 +286,7 @@ func (self *JSRE) loadScript(call otto.FunctionCall) otto.Value {
 // uses the "prettyPrint" JS function to format a value
 func (self *JSRE) PrettyPrint(v interface{}) (val otto.Value, err error) {
 	var method otto.Value
-	v, err = self.vm.ToValue(v)
+	v, err = self.ToValue(v)
 	if err != nil {
 		return
 	}
@@ -298,8 +298,22 @@ func (self *JSRE) PrettyPrint(v interface{}) (val otto.Value, err error) {
 }
 
 // creates an otto value from a go type
+func (self *JSRE) ToValue(v interface{}) (otto.Value, error) {
+	done := make(chan bool)
+	req := &evalReq{
+		fn: func(res *evalResult) {
+			res.result, res.err = self.vm.ToValue(v)
+		},
+		done: done,
+	}
+	self.evalQueue <- req
+	<-done
+	return req.res.result, req.res.err
+}
+
 func (self *JSRE) ToVal(v interface{}) otto.Value {
-	result, err := self.vm.ToValue(v)
+
+	result, err := self.ToValue(v)
 	if err != nil {
 		fmt.Println("Value unknown:", err)
 		return otto.UndefinedValue()