feat: fetch

__wasm/wit-bindgen-sample/container/Cargo.lock

@@ -142,6 +142,8 @@ name = "container"
 version = "0.1.0"
 dependencies = [
  "anyhow",
+ "serde",
+ "serde_json",
  "wasmtime",
  "wit-bindgen-wasmtime",
 ]
@@ -512,6 +514,12 @@ dependencies = [
  "either",
 ]
 
+[[package]]
+name = "itoa"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "112c678d4050afce233f4f2852bb2eb519230b3cf12f33585275537d7e41578d"
+
 [[package]]
 name = "ittapi-rs"
 version = "0.2.0"
@@ -839,6 +847,12 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "ryu"
+version = "1.0.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f3f6f92acf49d1b98f7a81226834412ada05458b7364277387724a237f062695"
+
 [[package]]
 name = "scopeguard"
 version = "1.1.0"
@@ -865,6 +879,17 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "serde_json"
+version = "1.0.82"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "82c2c1fdcd807d1098552c5b9a36e425e42e9fbd7c6a37a8425f390f781f7fa7"
+dependencies = [
+ "itoa",
+ "ryu",
+ "serde",
+]
+
 [[package]]
 name = "sha2"
 version = "0.9.9"

__wasm/wit-bindgen-sample/container/Cargo.toml

@@ -9,3 +9,5 @@ edition = "2021"
 anyhow = "1.0.58"
 wasmtime = "0.38.1"
 wit-bindgen-wasmtime = { path = '../wit-bindgen/crates/wasmtime' }
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"

__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),