src: set PromiseHooks by Environment

The new JS PromiseHooks introduced in the referenced PR are per
v8::Context. This meant that code depending on them, such as
AsyncLocalStorage, wouldn't behave correctly across vm.Context
instances.

PromiseHooks are now synchronized across the main Context and any
Context created via vm.Context.

Refs: nodejs#36394
Fixes: nodejs#38781
Signed-off-by: Bryan English <bryan@bryanenglish.com>

PR-URL: nodejs#38821
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: Vladimir de Turckheim <vlad2t@hotmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>

src/async_wrap.cc

@@ -493,8 +493,8 @@ static void EnablePromiseHook(const FunctionCallbackInfo<Value>& args) {
 
 static void SetPromiseHooks(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args);
-  Local<Context> ctx = env->context();
-  ctx->SetPromiseHooks(
+
+  env->async_hooks()->SetJSPromiseHooks(
     args[0]->IsFunction() ? args[0].As<Function>() : Local<Function>(),
     args[1]->IsFunction() ? args[1].As<Function>() : Local<Function>(),
     args[2]->IsFunction() ? args[2].As<Function>() : Local<Function>(),

src/env-inl.h

@@ -118,6 +118,20 @@ v8::Local<v8::Object> AsyncHooks::native_execution_async_resource(size_t i) {
   return PersistentToLocal::Strong(native_execution_async_resources_[i]);
 }
 
+inline void AsyncHooks::SetJSPromiseHooks(v8::Local<v8::Function> init,
+                                          v8::Local<v8::Function> before,
+                                          v8::Local<v8::Function> after,
+                                          v8::Local<v8::Function> resolve) {
+  js_promise_hooks_[0].Reset(env()->isolate(), init);
+  js_promise_hooks_[1].Reset(env()->isolate(), before);
+  js_promise_hooks_[2].Reset(env()->isolate(), after);
+  js_promise_hooks_[3].Reset(env()->isolate(), resolve);
+  for (auto it = contexts_.begin(); it != contexts_.end(); it++) {
+    PersistentToLocal::Weak(env()->isolate(), *it)
+        ->SetPromiseHooks(init, before, after, resolve);
+  }
+}
+
 inline v8::Local<v8::String> AsyncHooks::provider_string(int idx) {
   return env()->isolate_data()->async_wrap_provider(idx);
 }
@@ -240,6 +254,41 @@ void AsyncHooks::clear_async_id_stack() {
   fields_[kStackLength] = 0;
 }
 
+inline void AsyncHooks::AddContext(v8::Local<v8::Context> ctx) {
+  ctx->SetPromiseHooks(
+    js_promise_hooks_[0].IsEmpty() ?
+      v8::Local<v8::Function>() :
+      PersistentToLocal::Strong(js_promise_hooks_[0]),
+    js_promise_hooks_[1].IsEmpty() ?
+      v8::Local<v8::Function>() :
+      PersistentToLocal::Strong(js_promise_hooks_[1]),
+    js_promise_hooks_[2].IsEmpty() ?
+      v8::Local<v8::Function>() :
+      PersistentToLocal::Strong(js_promise_hooks_[2]),
+    js_promise_hooks_[3].IsEmpty() ?
+      v8::Local<v8::Function>() :
+      PersistentToLocal::Strong(js_promise_hooks_[3]));
+
+  size_t id = contexts_.size();
+  contexts_.resize(id + 1);
+  contexts_[id].Reset(env()->isolate(), ctx);
+  contexts_[id].SetWeak();
+}
+
+inline void AsyncHooks::RemoveContext(v8::Local<v8::Context> ctx) {
+  v8::Isolate* isolate = env()->isolate();
+  v8::HandleScope handle_scope(isolate);
+  for (auto it = contexts_.begin(); it != contexts_.end(); it++) {
+    v8::Local<v8::Context> saved_context =
+      PersistentToLocal::Weak(env()->isolate(), *it);
+    if (saved_context == ctx) {
+      it->Reset();
+      contexts_.erase(it);
+      break;
+    }
+  }
+}
+
 // The DefaultTriggerAsyncIdScope(AsyncWrap*) constructor is defined in
 // async_wrap-inl.h to avoid a circular dependency.
 
@@ -333,6 +382,8 @@ inline void Environment::AssignToContext(v8::Local<v8::Context> context,
 #if HAVE_INSPECTOR
   inspector_agent()->ContextCreated(context, info);
 #endif  // HAVE_INSPECTOR
+
+  this->async_hooks()->AddContext(context);
 }
 
 inline Environment* Environment::GetCurrent(v8::Isolate* isolate) {

src/env.cc

@@ -997,6 +997,7 @@ void AsyncHooks::MemoryInfo(MemoryTracker* tracker) const {
   tracker->TrackField("async_ids_stack", async_ids_stack_);
   tracker->TrackField("fields", fields_);
   tracker->TrackField("async_id_fields", async_id_fields_);
+  tracker->TrackField("js_promise_hooks", js_promise_hooks_);
 }
 
 void AsyncHooks::grow_async_ids_stack() {

src/env.h

@@ -648,6 +648,11 @@ class AsyncHooks : public MemoryRetainer {
   // The `js_execution_async_resources` array contains the value in that case.
   inline v8::Local<v8::Object> native_execution_async_resource(size_t index);
 
+  inline void SetJSPromiseHooks(v8::Local<v8::Function> init,
+                                v8::Local<v8::Function> before,
+                                v8::Local<v8::Function> after,
+                                v8::Local<v8::Function> resolve);
+
   inline v8::Local<v8::String> provider_string(int idx);
 
   inline void no_force_checks();
@@ -658,6 +663,9 @@ class AsyncHooks : public MemoryRetainer {
   inline bool pop_async_context(double async_id);
   inline void clear_async_id_stack();  // Used in fatal exceptions.
 
+  inline void AddContext(v8::Local<v8::Context> ctx);
+  inline void RemoveContext(v8::Local<v8::Context> ctx);
+
   AsyncHooks(const AsyncHooks&) = delete;
   AsyncHooks& operator=(const AsyncHooks&) = delete;
   AsyncHooks(AsyncHooks&&) = delete;
@@ -701,6 +709,10 @@ class AsyncHooks : public MemoryRetainer {
 
   v8::Global<v8::Array> js_execution_async_resources_;
   std::vector<v8::Global<v8::Object>> native_execution_async_resources_;
+
+  std::vector<v8::Global<v8::Context>> contexts_;
+
+  std::array<v8::Global<v8::Function>, 4> js_promise_hooks_;
 };
 
 class ImmediateInfo : public MemoryRetainer {

src/node_contextify.cc

@@ -127,6 +127,11 @@ ContextifyContext::ContextifyContext(
 
 ContextifyContext::~ContextifyContext() {
   env()->RemoveCleanupHook(CleanupHook, this);
+  Isolate* isolate = env()->isolate();
+  HandleScope scope(isolate);
+
+  env()->async_hooks()
+    ->RemoveContext(PersistentToLocal::Weak(isolate, context_));
 }
 
 

test/parallel/test-async-local-storage-contexts.js

@@ -0,0 +1,35 @@
+'use strict';
+
+require('../common');
+const assert = require('assert');
+const vm = require('vm');
+const { AsyncLocalStorage } = require('async_hooks');
+
+// Regression test for https://github.com/nodejs/node/issues/38781
+
+const context = vm.createContext({
+  AsyncLocalStorage,
+  assert
+});
+
+vm.runInContext(`
+  const storage = new AsyncLocalStorage()
+  async function test() {
+    return storage.run({ test: 'vm' }, async () => {
+      assert.strictEqual(storage.getStore().test, 'vm');
+      await 42;
+      assert.strictEqual(storage.getStore().test, 'vm');
+    });
+  }
+  test()
+`, context);
+
+const storage = new AsyncLocalStorage();
+async function test() {
+  return storage.run({ test: 'main context' }, async () => {
+    assert.strictEqual(storage.getStore().test, 'main context');
+    await 42;
+    assert.strictEqual(storage.getStore().test, 'main context');
+  });
+}
+test();