readFileSync is working

main.go

@@ -3,12 +3,37 @@ package main
 import (
 	"github.com/golang/protobuf/proto"
 	"github.com/ry/v8worker2"
+	"io/ioutil"
 	"os"
 )
 
-func recv(msg []byte) []byte {
-	println("recv cb", string(msg))
-	return nil
+func ReadFileSync(filename string) []byte {
+	buf, err := ioutil.ReadFile(filename)
+	msg := &Msg{Kind: Msg_DATA_RESPONSE}
+	if err != nil {
+		msg.Error = err.Error()
+	} else {
+		msg.Data = buf
+	}
+	out, err := proto.Marshal(msg)
+	if err != nil {
+		panic(err)
+	}
+	return out
+}
+
+func recv(buf []byte) []byte {
+	msg := &Msg{}
+	err := proto.Unmarshal(buf, msg)
+	if err != nil {
+		panic(err)
+	}
+	switch msg.Kind {
+	case Msg_READ_FILE_SYNC:
+		return ReadFileSync(msg.Path)
+	default:
+		panic("Unexpected message")
+	}
 }
 
 func loadAsset(w *v8worker2.Worker, path string) {