chore: quickjs PoC

package.json

@@ -124,6 +124,7 @@
     "json-schema-to-typescript": "^11.0.1",
     "node-stdlib-browser": "^1.2.0",
     "prettier": "^2.3.2",
+    "quickjs-emscripten": "^0.26.0",
     "rimraf": "^3.0.2",
     "smartweave": "0.4.48",
     "ts-jest": "^28.0.7",

tools/quickjs-handle.mjs

@@ -0,0 +1,261 @@
+import { DefaultIntrinsics, getQuickJS } from "quickjs-emscripten";
+
+const globalsCode = `
+    class ProcessError extends Error {
+      constructor(message) {
+        super(message);
+        this.name = "ProcessError";
+      }
+    }
+
+    let ao = {
+      _version: "0.0.3",
+      id: "",
+      _module: "",
+      authorities: [],
+      _ref: 0,
+      outbox: {
+        Messages: [],
+        Spawns: []
+      }
+    }
+    
+    let currentState = {};
+    
+    BigInt.prototype.toJSON = function () {
+      return this.toString();
+    };
+    
+    // to be called by SDK when evaluating for already cached state - same as WASM handlers
+    function __initState(newState) {
+      console.log('__initState', newState);
+      currentState = newState;
+    }
+    
+    // to be called by SDK after evaluating a message - same as WASM handlers
+    function __currentState() {
+      return JSON.stringify(currentState);
+    }
+    
+    function __getOutbox() {
+      return JSON.stringify(ao.outbox);
+    }
+`;
+
+// the example smart contract code loaded from Arweave
+// note: processCode MUST HAVE 'function handle(state, message, aoGlobals)'
+const processCode = `
+  function handle(state, message, aoGlobals) {
+      console.log('handle', message, aoGlobals, state);  
+      
+      if (!state.hasOwnProperty('counter')) {
+        state.counter = 0;
+      }
+      
+      if (message.action == 'increment') {
+        console.log('inside increment', state.counter);
+        state.counter++;
+        return;
+      }
+      
+      if (message.action == 'currentValue') {
+        return {
+          result: state.counter
+        }
+      }
+      
+      throw new ProcessError('unknown action');
+  }
+`.trim();
+
+const decorateProcessFn = (processCode) => {
+  return `
+      ${processCode}
+  
+      function __handleDecorator() {
+        return function(messageStringified, aoGlobalsStringified) {
+          console.log('handleDecorator');  
+          
+          // TODO: handle BigInt during parse - but how? maybe introduce some custom type "Amount"?
+          const message = JSON.parse(messageStringified);
+          const aoGlobals = JSON.parse(aoGlobalsStringified);
+          console.log('calling original handle');
+          
+          const result = handle(currentState, message, aoGlobals);
+          
+          return JSON.stringify(result);
+        }
+      }
+      
+      __handleDecorator();
+  `;
+};
+
+const decorateProcessFnEval = (processCode) => {
+  return `
+      ${processCode}
+  
+      function __handleDecorator(message, aoGlobals) {
+        console.log('handleDecorator');  
+        const result = handle(currentState, message, aoGlobals);
+        return JSON.stringify(result);
+      }
+  `;
+};
+
+async function main() {
+  const QuickJS = await getQuickJS();
+
+  // 1. creating the QJS runtime with proper memory/cycles limits
+  const runtime = QuickJS.newRuntime();
+  // TODO: memoryLimit, stack size and interrupt cycles should be configurable?
+  runtime.setMemoryLimit(1024 * 640);
+  // Limit stack size
+  runtime.setMaxStackSize(1024 * 320);
+  // Interrupt computation after 1024 calls to the interrupt handler
+  let interruptCycles = 0;
+  runtime.setInterruptHandler(() => ++interruptCycles > 1024);
+
+  // 2. creating the QJS context with proper intrinsics
+  const vm = runtime.newContext({
+    intrinsics: {
+      ...DefaultIntrinsics,
+      Date: false,
+      Proxy: false,
+      Promise: false,
+      MapSet: false,
+      BigFloat: false,
+      BigInt: true,
+      BigDecimal: false
+    }
+  });
+
+  // 3. example of registering functions from Host: registering "console.log" API
+  const logHandle = vm.newFunction("log", (...args) => {
+    const nativeArgs = args.map(vm.dump);
+    console.log("QuickJS:", ...nativeArgs);
+  });
+  const consoleHandle = vm.newObject();
+  vm.setProp(consoleHandle, "log", logHandle);
+  vm.setProp(vm.global, "console", consoleHandle);
+  consoleHandle.dispose();
+  logHandle.dispose();
+
+  // 4. evaluating globals
+  console.log("evaluating globals");
+  const globalsResult = vm.evalCode(globalsCode);
+  if (globalsResult.error) {
+    console.log("Globals eval failed:", vm.dump(globalsResult.error));
+    globalsResult.error.dispose();
+  } else {
+    globalsResult.value.dispose();
+  }
+
+  const initStateResult = vm.evalCode(`__initState(${JSON.stringify({ "counter": 666 })})`);
+  if (initStateResult.error) {
+    console.log("initState failed:", vm.dump(initStateResult.error));
+    initStateResult.error.dispose();
+  } else {
+    initStateResult.value.dispose();
+  }
+
+  // 5. evaluating decorated process function
+
+  // version with function
+  /*const handleFnResult = vm.evalCode(decorateProcessFn(processCode));
+  if (handleFnResult.error) {
+    console.log("HandleFn eval failed:", vm.dump(handleFnResult.error));
+    handleFnResult.error.dispose();
+  } else {
+    // note: this is a handle to the wrapped process function
+    const handleFn = vm.unwrapResult(handleFnResult);
+    // actually calling process function
+    doCall(handleFn, vm, "increment");
+    doCall(handleFn, vm, "increment");
+    doCall(handleFn, vm, "increment");
+    doCall(handleFn, vm, "increment");
+
+    const currentCounterValue = doCall(handleFn, vm, "currentValue");
+    console.log(currentCounterValue);
+
+    handleFn.dispose();
+  }*/
+
+  // version with evalCode
+  const handleFnResult = vm.evalCode(decorateProcessFnEval(processCode));
+  if (handleFnResult.error) {
+    console.log("HandleFn eval failed:", vm.dump(handleFnResult.error));
+    handleFnResult.error.dispose();
+  } else {
+    handleFnResult.value.dispose();
+  }
+  // actually calling process function
+  doCallEval(vm, "increment");
+  doCallEval(vm, "increment");
+  doCallEval(vm, "increment");
+  doCallEval(vm, "increment");
+
+
+  const currentCounterValue = doCallEval(vm, "currentValue");
+  console.log(currentCounterValue);
+
+  // 6. test error handling
+  try {
+    doCallEval(vm, "foobar");
+  } catch (e) {
+    console.error(e);
+  }
+
+  function doCallEval(vm, processFunction) {
+    const evalResult = vm.evalCode(
+      `__handleDecorator(
+      ${JSON.stringify({ "action": processFunction })},
+      ${JSON.stringify({ "owner": "just_ppe", "id": 123 })}
+      )`);
+
+    if (evalResult.error) {
+      const error = vm.dump(evalResult.error);
+      console.log("eval failed", error);
+      evalResult.error.dispose();
+      throw new Error('Eval error', { cause: error });
+    } else {
+      const resultValue = evalResult.value;
+      const stringValue = vm.getString(resultValue);
+      const result = stringValue === "undefined" ?
+        undefined
+        : JSON.parse(vm.getString(resultValue));
+      resultValue.dispose();
+      return result;
+    }
+  }
+
+  function doCall(handleFn, vm, processFunction) {
+    const evalResult = vm.callFunction(
+      handleFn,
+      vm.undefined,
+      vm.newString(JSON.stringify({ "action": processFunction })),
+      vm.newString(JSON.stringify({ "owner": "just_ppe" })));
+
+    if (evalResult.error) {
+      const error = vm.dump(evalResult.error);
+      console.log("eval failed", error);
+      evalResult.error.dispose();
+      throw new Error(error);
+    } else {
+      const resultValue = evalResult.value;
+      const stringValue = vm.getString(resultValue);
+      const result = stringValue === "undefined" ?
+        undefined
+        : JSON.parse(vm.getString(resultValue));
+      resultValue.dispose();
+      return result;
+    }
+  }
+
+  // btw: if the below throws an error, this means some
+  // of earlier values was not properly disposed
+  vm.dispose();
+  runtime.dispose();
+}
+
+main().finally(() => console.log("I'm done here."));

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);
+  });
+}