feat: fetch

__wasm/wit-bindgen-sample/container/src/main.rs

@@ -1,19 +1,37 @@
 use anyhow::Result;
+use serde::{Deserialize, Serialize};
 use wasmtime::{Config, Engine, Instance, Linker, Module, Store};
 
 use container::*;
 
 wit_bindgen_wasmtime::export!("../container.wit");
 
+#[derive(Clone, Debug, Serialize, Deserialize)]
+struct FetchResult {
+    error: Option<String>,
+    result: Option<String>,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+struct JsResult {
+    message: String,
+}
+
 #[derive(Default)]
 pub struct MyContainer;
 
 impl Container for MyContainer {
     fn fetch(&mut self, s: &str) -> String {
-        // format!("FETCHED: {}", s)
-        let r = "{\"result\":\"{}\"}".into();
-        println!(">>>> {}", r);
-        r
+        // // format!("FETCHED: {}", s)
+        // let r = "{\"result\":\"{}\"}".into();
+        // println!(">>>> {}", r);
+        // r
+        serde_json::to_string(&FetchResult {
+            error: None,
+            result: Some(serde_json::to_string(&JsResult {
+                message: format!("inputs: {}", s),
+            }).expect("to json failed.1")),
+        }).expect("to json failed.2")
     }
 }
 
@@ -28,7 +46,16 @@ fn main() -> Result<()> {
         |linker| container::add_to_linker(linker, |cx| -> &mut MyContainer { &mut cx.imports }),
         |store, module, linker| Exports::instantiate(store, module, linker, |cx| &mut cx.exports),
     )?;
-    let a = exports.eval_javascript(&mut store, "let a = [];fetch('aaa')");
+    let a = exports.eval_javascript(&mut store, r##"
+        let a = [];
+        a.push(fetch('https://www.google.com/'));
+        for (let i = 0; i < 3; i++) { a.push(i); }
+        a.push({
+          id: 1, name: 'hatter'
+        });
+        //JSON.stringify(a)
+        a
+    "##);
 
     match a {
         Ok(a) => println!("Hello, world! {:?}", a),