[oden] Native IO module

src/script/io.rs

@@ -71,7 +71,12 @@ impl IoImpl {
         self.thread_pool.execute(Box::new(move || {
             // TODO: Actually read the path.
             let path = path;
-            promise.resolve(move |ctx: &ContextRef| ctx.new_string(&path));
+
+            let result = std::fs::read(path);
+            promise.resolve(move |ctx: &ContextRef| match result {
+                Ok(v) => ctx.new_array_buffer(v),
+                Err(err) => Err(err.into()),
+            });
         }));
 
         Ok(value)