use native promise constructor

CHANGELOG.md

@@ -3,8 +3,12 @@
  * @Author: ekibun
  * @Date: 2020-08-08 08:16:50
  * @LastEditors: ekibun
- * @LastEditTime: 2020-08-28 10:46:26
+ * @LastEditTime: 2020-09-21 23:19:02
 -->
+## 0.1.0
+
+* refactor with ffi.
+
 ## 0.0.6
 
 * remove handler when destroy.

README.md

@@ -3,7 +3,7 @@
  * @Author: ekibun
  * @Date: 2020-08-08 08:16:50
  * @LastEditors: ekibun
- * @LastEditTime: 2020-08-27 21:11:55
+ * @LastEditTime: 2020-09-22 00:03:48
 -->
 # flutter_qjs
 
@@ -11,13 +11,13 @@ A quickjs engine for flutter.
 
 ## Feature
 
-This plugin is a simple js engine for flutter using the `quickjs` project. Plugin currently supports Windows, Linux, and Android.
+This plugin is a simple js engine for flutter using the `quickjs` project with `dart:ffi`. Plugin currently supports Windows, Linux, and Android.
 
-Each `FlutterJs` object creates a new thread that runs a simple js loop. 
+Event loop of `FlutterQjs` should be implemented by calling `FlutterQjs.dispatch()`. 
 
 ES6 module with `import` function is supported and can manage in dart with `setModuleHandler`.
 
-A global async function `dart` is presented to invoke dart function, and `Promise` is supported so that you can use `await` or `then` to get external result from `dart`. Data convertion between dart and js are implemented as follow:
+A global function `convert` is presented to invoke dart function. Data convertion between dart and js are implemented as follow:
 
 | dart | js |
 | --- | --- |
@@ -25,54 +25,50 @@ A global async function `dart` is presented to invoke dart function, and `Promis
 | Int | number |
 | Double | number |
 | String | string |
-| Uint8List/Int32List/Int64List | ArrayBuffer |
-| Float64List | number[] |
+| Uint8List | ArrayBuffer |
 | List | Array |
 | Map | Object |
-| Closure(List) => Future | function(....args) |
+| JSFunction | function(....args) |
+| Future | Promise |
 
-**notice:**
-1. All the `Uint8List/Int32List/Int64List` sent from dart will be converted to `ArrayBuffer` without marked the size of elements, and the `ArrayBuffer` will be converted to `Uint8List`.
-
-2. `function` can only sent from js to dart and all the arguments will be packed in a dart `List` object.
+**notice:** `function` can only sent from js to dart.
 
 ## Getting Started
 
-1. Create a `FlutterJs` object. Make sure call `destroy` to terminate thread and release memory when you don't need it.
+1. Create a `FlutterQjs` object. Call `dispatch` to dispatch event loop.
 
 ```dart
-FlutterJs engine = FlutterJs();
-// do something ...
-await engine.destroy();
-engine = null;
+final engine = FlutterQjs();
+await engine.dispatch();
 ```
 
 2. Call `setMethodHandler` to implements `dart` interaction. For example, you can use `Dio` to implements http in js:
 
 ```dart
-await engine.setMethodHandler((String method, List arg) async {
+await engine.setMethodHandler((String method, List arg) {
   switch (method) {
     case "http":
-      Response response = await Dio().get(arg[0]);
-      return response.data;
+      return Dio().get(arg[0]).then((response) => response.data);
     default:
-      return JsMethodHandlerNotImplement();
+      throw Exception("No such method");
   }
 });
 ```
 
-and in javascript, call `dart` function to get data:
+and in javascript, call `convert` function to get data, make sure the second memeber is a list:
 
 ```javascript
-dart("http", "http://example.com/");
+convert("http", ["http://example.com/"]);
 ```
 
-3. Call `setModuleHandler` to resolve js module. For example, you can use assets files as module:
+3. Call `setModuleHandler` to resolve js module.
+
+**important:** I cannot find a way to convert the sync ffi callback into an async function. So the assets files got by async function `rootBundle.loadString` cannot be used in this version. I will be appreciated that you can provied me a solution to make `ModuleHandler` async.
 
 ```dart
-await engine.setModuleHandler((String module) async {
-  return await rootBundle.loadString(
-      "js/" + module.replaceFirst(new RegExp(r".js$"), "") + ".js");
+await engine.setModuleHandler((String module) {
+  if(module == "hello") return "export default (name) => `hello \${name}!`;";
+  throw Exception("Module Not found");
 });
 ```
 
@@ -82,7 +78,7 @@ and in javascript, call `import` function to get module:
 import("hello").then(({default: greet}) => greet("world"));
 ```
 
-4. Use `evaluate` to run js script, and try-catch is needed to capture js exception.
+4. Use `evaluate` to run js script:
 
 ```dart
 try {
@@ -92,4 +88,6 @@ try {
 }
 ```
 
+5. Method `recreate` can free quickjs runtime that can be recreated again when calling `evaluate`, it can be used to reset the module cache. Call `close` to stop `dispatch` when you do not need it.
+
 [This example](example/lib/main.dart) contains a complete demonstration on how to use this plugin.

cxx/ffi.cpp

@@ -3,7 +3,7 @@
  * @Author: ekibun
  * @Date: 2020-09-06 18:32:45
  * @LastEditors: ekibun
- * @LastEditTime: 2020-09-21 18:34:04
+ * @LastEditTime: 2020-09-22 00:17:02
  */
 #include "quickjs/quickjs.h"
 #include <functional>
@@ -298,4 +298,9 @@ extern "C"
     JSContext *ctx;
     return JS_ExecutePendingJob(rt, &ctx);
   }
+
+  DLLEXPORT JSValue *jsNewPromiseCapability(JSContext *ctx, JSValue *resolving_funcs)
+  {
+    return new JSValue{JS_NewPromiseCapability(ctx, resolving_funcs)};
+  }
 }

example/ios/Flutter/Generated.xcconfig

@@ -0,0 +1,14 @@
+// This is a generated file; do not edit or check into version control.
+FLUTTER_ROOT=D:\flutter
+FLUTTER_APPLICATION_PATH=D:\project\vscode\neko\plugins\flutter_qjs\example
+FLUTTER_TARGET=lib\main.dart
+FLUTTER_BUILD_DIR=build
+SYMROOT=${SOURCE_ROOT}/../build\ios
+OTHER_LDFLAGS=$(inherited) -framework Flutter
+FLUTTER_FRAMEWORK_DIR=D:\flutter\bin\cache\artifacts\engine\ios
+FLUTTER_BUILD_NAME=1.0.0
+FLUTTER_BUILD_NUMBER=1
+DART_OBFUSCATION=false
+TRACK_WIDGET_CREATION=false
+TREE_SHAKE_ICONS=false
+PACKAGE_CONFIG=.packages

example/ios/Flutter/flutter_export_environment.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+# This is a generated file; do not edit or check into version control.
+export "FLUTTER_ROOT=D:\flutter"
+export "FLUTTER_APPLICATION_PATH=D:\project\vscode\neko\plugins\flutter_qjs\example"
+export "FLUTTER_TARGET=lib\main.dart"
+export "FLUTTER_BUILD_DIR=build"
+export "SYMROOT=${SOURCE_ROOT}/../build\ios"
+export "OTHER_LDFLAGS=$(inherited) -framework Flutter"
+export "FLUTTER_FRAMEWORK_DIR=D:\flutter\bin\cache\artifacts\engine\ios"
+export "FLUTTER_BUILD_NAME=1.0.0"
+export "FLUTTER_BUILD_NUMBER=1"
+export "DART_OBFUSCATION=false"
+export "TRACK_WIDGET_CREATION=false"
+export "TREE_SHAKE_ICONS=false"
+export "PACKAGE_CONFIG=.packages"

example/ios/Runner/GeneratedPluginRegistrant.h

@@ -0,0 +1,17 @@
+//
+//  Generated file. Do not edit.
+//
+
+#ifndef GeneratedPluginRegistrant_h
+#define GeneratedPluginRegistrant_h
+
+#import <Flutter/Flutter.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface GeneratedPluginRegistrant : NSObject
++ (void)registerWithRegistry:(NSObject<FlutterPluginRegistry>*)registry;
+@end
+
+NS_ASSUME_NONNULL_END
+#endif /* GeneratedPluginRegistrant_h */

example/ios/Runner/GeneratedPluginRegistrant.m

@@ -0,0 +1,12 @@
+//
+//  Generated file. Do not edit.
+//
+
+#import "GeneratedPluginRegistrant.h"
+
+@implementation GeneratedPluginRegistrant
+
++ (void)registerWithRegistry:(NSObject<FlutterPluginRegistry>*)registry {
+}
+
+@end

example/lib/main.dart

@@ -3,7 +3,7 @@
  * @Author: ekibun
  * @Date: 2020-08-08 08:16:51
  * @LastEditors: ekibun
- * @LastEditTime: 2020-09-21 13:50:40
+ * @LastEditTime: 2020-09-21 23:54:55
  */
 import 'package:flutter/material.dart';
 import 'dart:typed_data';
@@ -75,10 +75,8 @@ class _TestPageState extends State<TestPage> {
       }
     });
     engine.setModuleHandler((String module) {
-      if (module == "test") return "export default '${new DateTime.now()}'";
-      return "";
-      // return await rootBundle.loadString(
-      //     "js/" + module.replaceFirst(new RegExp(r".js$"), "") + ".js");
+      if (module == "hello") return "export default '${new DateTime.now()}'";
+      return "Module Not found";
     });
     engine.dispatch();
   }

lib/ffi.dart

@@ -3,7 +3,7 @@
  * @Author: ekibun
  * @Date: 2020-09-19 10:29:04
  * @LastEditors: ekibun
- * @LastEditTime: 2020-09-21 18:36:56
+ * @LastEditTime: 2020-09-22 00:23:36
  */
 import 'dart:ffi';
 import 'dart:io';
@@ -104,7 +104,6 @@ class RuntimeOpaque {
   JSChannel channel;
   List<JSRef> ref = List();
   ReceivePort port;
-  Pointer Function(Future) futureToPromise;
   Future Function(Pointer) promsieToFuture;
 }
 
@@ -723,3 +722,16 @@ final int Function(
       Pointer,
     )>>("jsExecutePendingJob")
     .asFunction();
+
+/// JSValue *jsNewPromiseCapability(JSContext *ctx, JSValue *resolving_funcs)
+final Pointer Function(
+  Pointer ctx,
+  Pointer resolvingFuncs,
+) jsNewPromiseCapability = qjsLib
+    .lookup<
+        NativeFunction<
+            Pointer Function(
+      Pointer,
+      Pointer,
+    )>>("jsNewPromiseCapability")
+    .asFunction();

lib/flutter_qjs.dart

@@ -3,11 +3,10 @@
  * @Author: ekibun
  * @Date: 2020-08-08 08:29:09
  * @LastEditors: ekibun
- * @LastEditTime: 2020-09-21 13:46:50
+ * @LastEditTime: 2020-09-21 23:59:40
  */
 import 'dart:async';
 import 'dart:ffi';
-import 'dart:io';
 import 'dart:isolate';
 
 import 'package:ffi/ffi.dart';

lib/wrapper.dart

@@ -3,13 +3,14 @@
  * @Author: ekibun
  * @Date: 2020-09-19 22:07:47
  * @LastEditors: ekibun
- * @LastEditTime: 2020-09-21 13:56:53
+ * @LastEditTime: 2020-09-22 00:27:54
  */
 import 'dart:async';
 import 'dart:ffi';
 import 'dart:typed_data';
 
 import 'package:ffi/ffi.dart';
+import 'package:flutter/cupertino.dart';
 
 import 'ffi.dart';
 
@@ -114,7 +115,20 @@ String parseJSException(Pointer ctx, {Pointer e}) {
 
 Pointer dartToJs(Pointer ctx, dynamic val, {Map<dynamic, dynamic> cache}) {
   if (val is Future) {
-    return runtimeOpaques[jsGetRuntime(ctx)]?.futureToPromise(val);
+    var resolvingFunc = allocate<Uint8>(count: sizeOfJSValue * 2);
+    var resolvingFunc2 = Pointer.fromAddress(resolvingFunc.address + sizeOfJSValue);
+    var ret = jsNewPromiseCapability(ctx, resolvingFunc);
+    var res = jsToDart(ctx, resolvingFunc);
+    var rej = jsToDart(ctx, resolvingFunc2);
+    jsFreeValue(ctx, resolvingFunc);
+    jsFreeValue(ctx, resolvingFunc2);
+    free(resolvingFunc);
+    val.then((value) {
+      res(value);
+    }, onError: (e, stack) {
+      rej(e.toString() + "\n" + stack.toString());
+    });
+    return ret;
   }
   if (cache == null) cache = Map();
   if (val is bool) return jsNewBool(ctx, val ? 1 : 0);
@@ -251,37 +265,6 @@ dynamic jsToDart(Pointer ctx, Pointer val, {Map<int, dynamic> cache}) {
 
 Pointer jsNewContextWithPromsieWrapper(Pointer rt) {
   var ctx = jsNewContext(rt);
-  var jsPromiseCtor = jsEval(
-      ctx,
-      """
-        () => {
-          const __resolver = {};
-          const __ret = new Promise((res, rej) => {
-            __resolver.__res = res;
-            __resolver.__rej = rej;
-          });
-          __ret.__res = __resolver.__res;
-          __ret.__rej = __resolver.__rej;
-          return __ret;
-        }
-        """,
-      "<future>",
-      JSEvalType.GLOBAL);
-  var promiseCtor = JSRefValue(ctx, jsPromiseCtor);
-  jsFreeValue(ctx, jsPromiseCtor);
-  deleteJSValue(jsPromiseCtor);
-  runtimeOpaques[rt].futureToPromise = (future) {
-    var ctor = promiseCtor.val;
-    if (ctor == null) throw Exception("Runtime has been released!");
-    var jsPromise = jsCall(ctx, ctor, null, List());
-    var promise = jsToDart(ctx, jsPromise);
-    future.then((value) {
-      promise['__res'](value);
-    }).catchError((err) {
-      promise['__rej'](err);
-    });
-    return jsPromise;
-  };
   var jsPromiseWrapper = jsEval(
       ctx,
       """