lib,src: replace all C++ promises with JS promises

C++ promises can not be properly optimized by V8. They also behave
a tiny bit different than "regular" promises.

Author: BridgeAR

lib/child_process.js

@@ -26,8 +26,6 @@ const {
   deprecate, convertToValidSignal, getSystemErrorName
 } = require('internal/util');
 const { isUint8Array } = require('internal/util/types');
-const { createPromise,
-        promiseResolve, promiseReject } = process.binding('util');
 const debug = util.debuglog('child_process');
 const { Buffer } = require('buffer');
 const { Pipe, constants: PipeConstants } = process.binding('pipe_wrap');
@@ -152,18 +150,17 @@ exports.exec = function exec(command /* , options, callback */) {
 
 const customPromiseExecFunction = (orig) => {
   return (...args) => {
-    const promise = createPromise();
-
-    orig(...args, (err, stdout, stderr) => {
-      if (err !== null) {
-        err.stdout = stdout;
-        err.stderr = stderr;
-        promiseReject(promise, err);
-      } else {
-        promiseResolve(promise, { stdout, stderr });
-      }
+    return new Promise((resolve, reject) => {
+      orig(...args, (err, stdout, stderr) => {
+        if (err !== null) {
+          err.stdout = stdout;
+          err.stderr = stderr;
+          reject(err);
+        } else {
+          resolve({ stdout, stderr });
+        }
+      });
     });
-    return promise;
   };
 };
 

lib/fs.js

@@ -213,10 +213,7 @@ function exists(path, callback) {
 
 Object.defineProperty(exists, internalUtil.promisify.custom, {
   value: (path) => {
-    const { createPromise, promiseResolve } = process.binding('util');
-    const promise = createPromise();
-    fs.exists(path, (exists) => promiseResolve(promise, exists));
-    return promise;
+    return new Promise((resolve) => fs.exists(path, resolve));
   }
 });
 

lib/internal/http2/core.js

@@ -113,7 +113,6 @@ const { isArrayBufferView } = require('internal/util/types');
 const { FileHandle } = process.binding('fs');
 const binding = process.binding('http2');
 const { ShutdownWrap } = process.binding('stream_wrap');
-const { createPromise, promiseResolve } = process.binding('util');
 const { UV_EOF } = process.binding('uv');
 
 const { StreamPipe } = internalBinding('stream_pipe');
@@ -2747,11 +2746,9 @@ function connect(authority, options, listener) {
 // Support util.promisify
 Object.defineProperty(connect, promisify.custom, {
   value: (authority, options) => {
-    const promise = createPromise();
-    const server = connect(authority,
-                           options,
-                           () => promiseResolve(promise, server));
-    return promise;
+    return new Promise((resolve) => {
+      const server = connect(authority, options, () => resolve(server));
+    });
   }
 });
 

lib/internal/util.js

@@ -8,10 +8,7 @@ const {
 const { signals } = process.binding('constants').os;
 
 const {
-  createPromise,
   getHiddenValue,
-  promiseResolve,
-  promiseReject,
   setHiddenValue,
   arrow_message_private_symbol: kArrowMessagePrivateSymbolIndex,
   decorated_private_symbol: kDecoratedPrivateSymbolIndex
@@ -276,24 +273,21 @@ function promisify(original) {
   const argumentNames = original[kCustomPromisifyArgsSymbol];
 
   function fn(...args) {
-    const promise = createPromise();
-    try {
+    return new Promise((resolve, reject) => {
       original.call(this, ...args, (err, ...values) => {
         if (err) {
-          promiseReject(promise, err);
-        } else if (argumentNames !== undefined && values.length > 1) {
+          return reject(err);
+        }
+        if (argumentNames !== undefined && values.length > 1) {
           const obj = {};
           for (var i = 0; i < argumentNames.length; i++)
             obj[argumentNames[i]] = values[i];
-          promiseResolve(promise, obj);
+          resolve(obj);
         } else {
-          promiseResolve(promise, values[0]);
+          resolve(values[0]);
         }
       });
-    } catch (err) {
-      promiseReject(promise, err);
-    }
-    return promise;
+    });
   }
 
   Object.setPrototypeOf(fn, Object.getPrototypeOf(original));

lib/timers.js

@@ -41,7 +41,6 @@ const {
   validateTimerDuration
 } = require('internal/timers');
 const internalUtil = require('internal/util');
-const { createPromise, promiseResolve } = process.binding('util');
 const util = require('util');
 const { ERR_INVALID_CALLBACK } = require('internal/errors').codes;
 const debug = util.debuglog('timer');
@@ -439,11 +438,9 @@ function setTimeout(callback, after, arg1, arg2, arg3) {
 }
 
 setTimeout[internalUtil.promisify.custom] = function(after, value) {
-  const promise = createPromise();
-  const timeout = new Timeout(promise, after, [value], false);
-  active(timeout);
-
-  return promise;
+  return new Promise((resolve) => {
+    active(new Timeout(resolve, after, [value], false));
+  });
 };
 
 exports.setTimeout = setTimeout;
@@ -452,7 +449,7 @@ exports.setTimeout = setTimeout;
 function ontimeout(timer) {
   const args = timer._timerArgs;
   if (typeof timer._onTimeout !== 'function')
-    return promiseResolve(timer._onTimeout, args[0]);
+    return Promise.resolve(timer._onTimeout, args[0]);
   if (!args)
     timer._onTimeout();
   else
@@ -659,7 +656,7 @@ function tryOnImmediate(immediate, oldTail, count, refCount) {
 function runCallback(timer) {
   const argv = timer._argv;
   if (typeof timer._onImmediate !== 'function')
-    return promiseResolve(timer._onImmediate, argv[0]);
+    return Promise.resolve(timer._onImmediate, argv[0]);
   if (!argv)
     return timer._onImmediate();
   Reflect.apply(timer._onImmediate, timer, argv);
@@ -738,9 +735,7 @@ function setImmediate(callback, arg1, arg2, arg3) {
 }
 
 setImmediate[internalUtil.promisify.custom] = function(value) {
-  const promise = createPromise();
-  new Immediate(promise, [value]);
-  return promise;
+  return new Promise((resolve) => new Immediate(resolve, [value]));
 };
 
 exports.setImmediate = setImmediate;

src/node_util.cc

@@ -9,7 +9,6 @@ using v8::Context;
 using v8::FunctionCallbackInfo;
 using v8::Integer;
 using v8::Local;
-using v8::Maybe;
 using v8::Object;
 using v8::Private;
 using v8::Promise;
@@ -140,36 +139,6 @@ void WatchdogHasPendingSigint(const FunctionCallbackInfo<Value>& args) {
   args.GetReturnValue().Set(ret);
 }
 
-
-void CreatePromise(const FunctionCallbackInfo<Value>& args) {
-  Local<Context> context = args.GetIsolate()->GetCurrentContext();
-  auto maybe_resolver = Promise::Resolver::New(context);
-  if (!maybe_resolver.IsEmpty())
-    args.GetReturnValue().Set(maybe_resolver.ToLocalChecked());
-}
-
-
-void PromiseResolve(const FunctionCallbackInfo<Value>& args) {
-  Local<Context> context = args.GetIsolate()->GetCurrentContext();
-  Local<Value> promise = args[0];
-  CHECK(promise->IsPromise());
-  if (promise.As<Promise>()->State() != Promise::kPending) return;
-  Local<Promise::Resolver> resolver = promise.As<Promise::Resolver>();  // sic
-  Maybe<bool> ret = resolver->Resolve(context, args[1]);
-  args.GetReturnValue().Set(ret.FromMaybe(false));
-}
-
-
-void PromiseReject(const FunctionCallbackInfo<Value>& args) {
-  Local<Context> context = args.GetIsolate()->GetCurrentContext();
-  Local<Value> promise = args[0];
-  CHECK(promise->IsPromise());
-  if (promise.As<Promise>()->State() != Promise::kPending) return;
-  Local<Promise::Resolver> resolver = promise.As<Promise::Resolver>();  // sic
-  Maybe<bool> ret = resolver->Reject(context, args[1]);
-  args.GetReturnValue().Set(ret.FromMaybe(false));
-}
-
 void SafeGetenv(const FunctionCallbackInfo<Value>& args) {
   CHECK(args[0]->IsString());
   Utf8Value strenvtag(args.GetIsolate(), args[0]);
@@ -224,10 +193,6 @@ void Initialize(Local<Object> target,
   env->SetMethodNoSideEffect(target, "watchdogHasPendingSigint",
                              WatchdogHasPendingSigint);
 
-  env->SetMethodNoSideEffect(target, "createPromise", CreatePromise);
-  env->SetMethod(target, "promiseResolve", PromiseResolve);
-  env->SetMethod(target, "promiseReject", PromiseReject);
-
   env->SetMethod(target, "safeGetenv", SafeGetenv);
 }