chore: quickjs PoC

Author: ppedziwiatr

package.json

@@ -116,6 +116,7 @@
     "json-schema-to-typescript": "^11.0.1",
     "node-stdlib-browser": "^1.2.0",
     "prettier": "^2.3.2",
+    "quickjs-emscripten": "^0.23.0",
     "rimraf": "^3.0.2",
     "smartweave": "0.4.48",
     "ts-jest": "^28.0.7",

tools/quickjs.mjs

@@ -0,0 +1,79 @@
+import { getQuickJS, newQuickJSAsyncWASMModule } from "quickjs-emscripten";
+
+// the example smart contract code loaded from Arweave blockchain
+const code = `
+    function handle(state, action) {
+      console.log('handle before timeout');
+      const timeoutResult = timeout(100); // no 'await' here, because fuck logic
+      console.log('handle after timeout:', timeoutResult);
+      
+      const someShit = {};
+      
+      for (i = 0; i < 100000; i++) {
+        someShit[""+i] = i*i;
+      }
+      
+      return 1;
+    }
+`.trim();
+
+async function main() {
+
+  // 1. creating the QJS context
+  const QuickJS = await newQuickJSAsyncWASMModule();
+  const runtime = QuickJS.newRuntime();
+  // "Should be enough for everyone" -- attributed to B. Gates
+  // runtime.setMemoryLimit(1024 * 640);
+  // Limit stack size
+  runtime.setMaxStackSize(1024 * 320);
+  let interruptCycles = 0
+  runtime.setInterruptHandler((runtime) => { interruptCycles++ });
+
+  const vm = runtime.newContext();
+
+  // 2. registering APIs
+  const logHandle = vm.newFunction("log", (...args) => {
+    const nativeArgs = args.map(vm.dump)
+    console.log("QuickJS:", ...nativeArgs)
+  });
+
+  const consoleHandle = vm.newObject();
+  vm.setProp(consoleHandle, "log", logHandle);
+  vm.setProp(vm.global, "console", consoleHandle);
+  consoleHandle.dispose();
+  logHandle.dispose();
+
+  const timeoutHandle = vm.newAsyncifiedFunction("timeout", async (msHandle) => {
+    const ms = vm.getNumber(msHandle);
+    console.log("omg, that's an async shit!");
+    await timeout(1000);
+    return vm.newString("check your head!");
+  })
+  timeoutHandle.consume((fn) => vm.setProp(vm.global, "timeout", fn))
+
+  // 4. calling the "handle" function
+  const result = await vm.evalCodeAsync(`(() => {
+  ${code} 
+  return handle();
+})()`);
+
+  if (result.error) {
+    console.log('Execution failed:', vm.dump(result.error));
+    result.error.dispose();
+  } else {
+    const parsedResult = vm.unwrapResult(result).consume(vm.getNumber);
+    console.log("result", parsedResult);
+    console.log("Cycles", interruptCycles);
+  }
+
+  vm.dispose();
+  runtime.dispose();
+}
+
+main().finally();
+
+function timeout(delay) {
+  return new Promise(function (resolve) {
+    setTimeout(resolve, delay);
+  });
+}

yarn.lock

@@ -6623,6 +6623,11 @@ quick-lru@^5.1.1:
   resolved "https://registry.yarnpkg.com/quick-lru/-/quick-lru-5.1.1.tgz#366493e6b3e42a3a6885e2e99d18f80fb7a8c932"
   integrity sha512-WuyALRjWPDGtt/wzJiadO5AXY+8hZ80hVpe6MyivgraREW751X3SbhRvG3eLKOYN+8VEvqLcf3wdnt44Z4S4SA==
 
+quickjs-emscripten@^0.23.0:
+  version "0.23.0"
+  resolved "https://registry.yarnpkg.com/quickjs-emscripten/-/quickjs-emscripten-0.23.0.tgz#94f412d0ee5f3021fc12ddf6c0b00bd8ce0d28b9"
+  integrity sha512-CIP+NDRYDDqbT3cTiN8Bon1wsZ7IgISVYCJHYsPc86oxszpepVMPXFfttyQgn1u1okg1HPnCnM7Xv1LrCO/VmQ==
+
 randombytes@^2.0.0, randombytes@^2.0.1, randombytes@^2.0.5, randombytes@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/randombytes/-/randombytes-2.1.0.tgz#df6f84372f0270dc65cdf6291349ab7a473d4f2a"