/
web_worker_observer.cc
92 lines (72 loc) · 3.03 KB
/
web_worker_observer.cc
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// Copyright (c) 2017 GitHub, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.
#include "shell/renderer/web_worker_observer.h"
#include "base/lazy_instance.h"
#include "base/threading/thread_local.h"
#include "shell/common/api/electron_bindings.h"
#include "shell/common/gin_helper/event_emitter_caller.h"
#include "shell/common/node_bindings.h"
#include "shell/common/node_includes.h"
namespace electron {
namespace {
static base::LazyInstance<
base::ThreadLocalPointer<WebWorkerObserver>>::DestructorAtExit lazy_tls =
LAZY_INSTANCE_INITIALIZER;
} // namespace
// static
WebWorkerObserver* WebWorkerObserver::GetCurrent() {
WebWorkerObserver* self = lazy_tls.Pointer()->Get();
return self ? self : new WebWorkerObserver;
}
WebWorkerObserver::WebWorkerObserver()
: node_bindings_(
NodeBindings::Create(NodeBindings::BrowserEnvironment::kWorker)),
electron_bindings_(
std::make_unique<ElectronBindings>(node_bindings_->uv_loop())) {
lazy_tls.Pointer()->Set(this);
}
WebWorkerObserver::~WebWorkerObserver() {
lazy_tls.Pointer()->Set(nullptr);
// Destroying the node environment will also run the uv loop,
// Node.js expects `kExplicit` microtasks policy and will run microtasks
// checkpoints after every call into JavaScript. Since we use a different
// policy in the renderer - switch to `kExplicit`
v8::Isolate* isolate = node_bindings_->uv_env()->isolate();
DCHECK_EQ(v8::MicrotasksScope::GetCurrentDepth(isolate), 0);
isolate->SetMicrotasksPolicy(v8::MicrotasksPolicy::kExplicit);
node::FreeEnvironment(node_bindings_->uv_env());
node::FreeIsolateData(node_bindings_->isolate_data());
}
void WebWorkerObserver::WorkerScriptReadyForEvaluation(
v8::Local<v8::Context> worker_context) {
v8::Context::Scope context_scope(worker_context);
auto* isolate = worker_context->GetIsolate();
v8::MicrotasksScope microtasks_scope(
isolate, v8::MicrotasksScope::kDoNotRunMicrotasks);
// Start the embed thread.
node_bindings_->PrepareMessageLoop();
// Setup node tracing controller.
if (!node::tracing::TraceEventHelper::GetAgent())
node::tracing::TraceEventHelper::SetAgent(node::CreateAgent());
// Setup node environment for each window.
bool initialized = node::InitializeContext(worker_context);
CHECK(initialized);
node::Environment* env =
node_bindings_->CreateEnvironment(worker_context, nullptr);
// Add Electron extended APIs.
electron_bindings_->BindTo(env->isolate(), env->process_object());
// Load everything.
node_bindings_->LoadEnvironment(env);
// Make uv loop being wrapped by window context.
node_bindings_->set_uv_env(env);
// Give the node loop a run to make sure everything is ready.
node_bindings_->RunMessageLoop();
}
void WebWorkerObserver::ContextWillDestroy(v8::Local<v8::Context> context) {
node::Environment* env = node::Environment::GetCurrent(context);
if (env)
gin_helper::EmitEvent(env->isolate(), env->process_object(), "exit");
delete this;
}
} // namespace electron