46 lines
1.8 KiB
C++
46 lines
1.8 KiB
C++
// Copyright (c) 2019 GitHub, Inc.
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// Use of this source code is governed by the MIT license that can be
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// found in the LICENSE file.
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#include "shell/common/gin_helper/event_emitter_caller.h"
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#include "shell/common/gin_helper/microtasks_scope.h"
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#include "shell/common/node_includes.h"
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namespace gin_helper::internal {
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v8::Local<v8::Value> CallMethodWithArgs(v8::Isolate* isolate,
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v8::Local<v8::Object> obj,
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const char* method,
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ValueVector* args) {
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// An active node::Environment is required for node::MakeCallback.
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std::unique_ptr<node::CallbackScope> callback_scope;
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if (node::Environment::GetCurrent(isolate)) {
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v8::HandleScope handle_scope(isolate);
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callback_scope = std::make_unique<node::CallbackScope>(
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isolate, v8::Object::New(isolate), node::async_context{0, 0});
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} else {
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return v8::Boolean::New(isolate, false);
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}
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// Perform microtask checkpoint after running JavaScript.
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gin_helper::MicrotasksScope microtasks_scope{
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isolate, obj->GetCreationContextChecked()->GetMicrotaskQueue(), true,
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v8::MicrotasksScope::kRunMicrotasks};
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// node::MakeCallback will also run pending tasks in Node.js.
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v8::MaybeLocal<v8::Value> ret = node::MakeCallback(
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isolate, obj, method, args->size(), args->data(), {0, 0});
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// If the JS function throws an exception (doesn't return a value) the result
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// of MakeCallback will be empty and therefore ToLocal will be false, in this
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// case we need to return "false" as that indicates that the event emitter did
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// not handle the event
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v8::Local<v8::Value> localRet;
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if (ret.ToLocal(&localRet))
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return localRet;
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return v8::Boolean::New(isolate, false);
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}
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} // namespace gin_helper::internal
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