8327ed0eearefactor: small refactor to WebWorkerObserver::WorkerScriptReadyForEvaluation() - replace a std::vector<std::string> local with a compile-time array of std::string_view - remove .c_str() pessimization when making v8 Strings from string_views Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com> Co-authored-by: Charles Kerr <charles@charleskerr.com>
136 lines
4.6 KiB
C++
136 lines
4.6 KiB
C++
// Copyright (c) 2017 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/renderer/web_worker_observer.h"
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#include <string_view>
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#include <utility>
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#include "base/no_destructor.h"
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#include "base/strings/strcat.h"
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#include "base/threading/thread_local.h"
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#include "shell/common/api/electron_bindings.h"
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#include "shell/common/gin_helper/event_emitter_caller.h"
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#include "shell/common/node_bindings.h"
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#include "shell/common/node_includes.h"
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namespace electron {
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namespace {
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static base::NoDestructor<base::ThreadLocalOwnedPointer<WebWorkerObserver>>
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lazy_tls;
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} // namespace
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// static
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WebWorkerObserver* WebWorkerObserver::GetCurrent() {
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return lazy_tls->Get();
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}
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// static
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WebWorkerObserver* WebWorkerObserver::Create() {
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auto obs = std::make_unique<WebWorkerObserver>();
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auto* obs_raw = obs.get();
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lazy_tls->Set(std::move(obs));
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return obs_raw;
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}
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WebWorkerObserver::WebWorkerObserver()
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: node_bindings_(
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NodeBindings::Create(NodeBindings::BrowserEnvironment::kWorker)),
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electron_bindings_(
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std::make_unique<ElectronBindings>(node_bindings_->uv_loop())) {}
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WebWorkerObserver::~WebWorkerObserver() = default;
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void WebWorkerObserver::WorkerScriptReadyForEvaluation(
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v8::Local<v8::Context> worker_context) {
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v8::Context::Scope context_scope(worker_context);
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auto* isolate = worker_context->GetIsolate();
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v8::MicrotasksScope microtasks_scope(
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worker_context, v8::MicrotasksScope::kDoNotRunMicrotasks);
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// Start the embed thread.
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node_bindings_->PrepareEmbedThread();
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// Setup node tracing controller.
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if (!node::tracing::TraceEventHelper::GetAgent()) {
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auto* tracing_agent = new node::tracing::Agent();
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node::tracing::TraceEventHelper::SetAgent(tracing_agent);
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}
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// Setup node environment for each window.
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v8::Maybe<bool> initialized = node::InitializeContext(worker_context);
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CHECK(!initialized.IsNothing() && initialized.FromJust());
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std::shared_ptr<node::Environment> env =
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node_bindings_->CreateEnvironment(worker_context, nullptr);
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// We need to use the Blink implementation of fetch in web workers
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// Node.js deletes the global fetch function when their fetch implementation
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// is disabled, so we need to save and re-add it after the Node.js environment
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// is loaded. See corresponding change in node/init.ts.
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v8::Local<v8::Object> global = worker_context->Global();
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for (const std::string_view key :
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{"fetch", "Response", "FormData", "Request", "Headers", "EventSource"}) {
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v8::MaybeLocal<v8::Value> value =
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global->Get(worker_context, gin::StringToV8(isolate, key));
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if (!value.IsEmpty()) {
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std::string blink_key = base::StrCat({"blink", key});
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global
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->Set(worker_context, gin::StringToV8(isolate, blink_key),
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value.ToLocalChecked())
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.Check();
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}
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}
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// We do not want to crash Web Workers on unhandled rejections.
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env->options()->unhandled_rejections = "warn-with-error-code";
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// Add Electron extended APIs.
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electron_bindings_->BindTo(env->isolate(), env->process_object());
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// Load everything.
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node_bindings_->LoadEnvironment(env.get());
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// Make uv loop being wrapped by window context.
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node_bindings_->set_uv_env(env.get());
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// Give the node loop a run to make sure everything is ready.
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node_bindings_->StartPolling();
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// Keep the environment alive until we free it in ContextWillDestroy()
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environments_.insert(std::move(env));
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}
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void WebWorkerObserver::ContextWillDestroy(v8::Local<v8::Context> context) {
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node::Environment* env = node::Environment::GetCurrent(context);
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if (env) {
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v8::Context::Scope context_scope(env->context());
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gin_helper::EmitEvent(env->isolate(), env->process_object(), "exit");
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}
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// Destroying the node environment will also run the uv loop,
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// Node.js expects `kExplicit` microtasks policy and will run microtasks
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// checkpoints after every call into JavaScript. Since we use a different
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// policy in the renderer - switch to `kExplicit`
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v8::MicrotaskQueue* microtask_queue = context->GetMicrotaskQueue();
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auto old_policy = microtask_queue->microtasks_policy();
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DCHECK_EQ(microtask_queue->GetMicrotasksScopeDepth(), 0);
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microtask_queue->set_microtasks_policy(v8::MicrotasksPolicy::kExplicit);
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base::EraseIf(environments_,
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[env](auto const& item) { return item.get() == env; });
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microtask_queue->set_microtasks_policy(old_policy);
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// ElectronBindings is tracking node environments.
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electron_bindings_->EnvironmentDestroyed(env);
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if (lazy_tls->Get())
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lazy_tls->Set(nullptr);
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}
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} // namespace electron
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