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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/core/workers/threaded_messaging_proxy_base.h"
#include "base/synchronization/waitable_event.h"
#include "third_party/blink/public/platform/task_type.h"
#include "third_party/blink/public/platform/web_worker_fetch_context.h"
#include "third_party/blink/renderer/bindings/core/v8/source_location.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/frame/deprecation.h"
#include "third_party/blink/renderer/core/inspector/console_message.h"
#include "third_party/blink/renderer/core/inspector/devtools_agent.h"
#include "third_party/blink/renderer/core/inspector/worker_devtools_params.h"
#include "third_party/blink/renderer/core/loader/document_loader.h"
#include "third_party/blink/renderer/core/workers/global_scope_creation_params.h"
#include "third_party/blink/renderer/core/workers/worker_global_scope.h"
#include "third_party/blink/renderer/platform/heap/heap.h"
#include "third_party/blink/renderer/platform/loader/fetch/resource_fetcher.h"
namespace blink {
namespace {
static int g_live_messaging_proxy_count = 0;
} // namespace
ThreadedMessagingProxyBase::ThreadedMessagingProxyBase(
ExecutionContext* execution_context)
: execution_context_(execution_context),
parent_execution_context_task_runners_(
ParentExecutionContextTaskRunners::Create(execution_context_.Get())),
terminate_sync_load_event_(
base::WaitableEvent::ResetPolicy::MANUAL,
base::WaitableEvent::InitialState::NOT_SIGNALED),
feature_handle_for_scheduler_(
execution_context->GetScheduler()->RegisterFeature(
SchedulingPolicy::Feature::kDedicatedWorkerOrWorklet,
{SchedulingPolicy::DisableBackForwardCache()})),
keep_alive_(PERSISTENT_FROM_HERE, this) {
DCHECK(IsParentContextThread());
g_live_messaging_proxy_count++;
}
ThreadedMessagingProxyBase::~ThreadedMessagingProxyBase() {
g_live_messaging_proxy_count--;
}
int ThreadedMessagingProxyBase::ProxyCount() {
DCHECK(IsMainThread());
return g_live_messaging_proxy_count;
}
void ThreadedMessagingProxyBase::Trace(Visitor* visitor) const {
visitor->Trace(execution_context_);
}
void ThreadedMessagingProxyBase::InitializeWorkerThread(
std::unique_ptr<GlobalScopeCreationParams> global_scope_creation_params,
const base::Optional<WorkerBackingThreadStartupData>& thread_startup_data,
const base::Optional<const blink::DedicatedWorkerToken>& token) {
DCHECK(IsParentContextThread());
KURL script_url = global_scope_creation_params->script_url.Copy();
if (global_scope_creation_params->web_worker_fetch_context) {
global_scope_creation_params->web_worker_fetch_context
->SetTerminateSyncLoadEvent(&terminate_sync_load_event_);
}
worker_thread_ = CreateWorkerThread();
auto devtools_params = DevToolsAgent::WorkerThreadCreated(
execution_context_.Get(), worker_thread_.get(), script_url,
global_scope_creation_params->global_scope_name.IsolatedCopy(), token);
worker_thread_->Start(std::move(global_scope_creation_params),
thread_startup_data, std::move(devtools_params));
if (auto* scope = DynamicTo<WorkerGlobalScope>(*execution_context_)) {
scope->GetThread()->ChildThreadStartedOnWorkerThread(worker_thread_.get());
}
}
void ThreadedMessagingProxyBase::CountFeature(WebFeature feature) {
DCHECK(IsParentContextThread());
UseCounter::Count(execution_context_, feature);
}
void ThreadedMessagingProxyBase::ReportConsoleMessage(
mojom::ConsoleMessageSource source,
mojom::ConsoleMessageLevel level,
const String& message,
std::unique_ptr<SourceLocation> location) {
DCHECK(IsParentContextThread());
if (asked_to_terminate_)
return;
execution_context_->AddConsoleMessage(MakeGarbageCollected<ConsoleMessage>(
level, message, std::move(location), worker_thread_.get()));
}
void ThreadedMessagingProxyBase::ParentObjectDestroyed() {
DCHECK(IsParentContextThread());
if (worker_thread_) {
// Request to terminate the global scope. This will eventually call
// WorkerThreadTerminated().
TerminateGlobalScope();
} else {
WorkerThreadTerminated();
}
}
void ThreadedMessagingProxyBase::WorkerThreadTerminated() {
DCHECK(IsParentContextThread());
// This method is always the last to be performed, so the proxy is not
// needed for communication in either side any more. However, the parent
// Worker/Worklet object may still exist, and it assumes that the proxy
// exists, too.
asked_to_terminate_ = true;
WorkerThread* parent_thread = nullptr;
if (auto* scope = DynamicTo<WorkerGlobalScope>(*execution_context_))
parent_thread = scope->GetThread();
std::unique_ptr<WorkerThread> child_thread = std::move(worker_thread_);
if (child_thread) {
DevToolsAgent::WorkerThreadTerminated(execution_context_.Get(),
child_thread.get());
}
// If the parent Worker/Worklet object was already destroyed, this will
// destroy |this|.
keep_alive_.Clear();
if (parent_thread && child_thread)
parent_thread->ChildThreadTerminatedOnWorkerThread(child_thread.get());
}
void ThreadedMessagingProxyBase::TerminateGlobalScope() {
DCHECK(IsParentContextThread());
if (asked_to_terminate_)
return;
asked_to_terminate_ = true;
feature_handle_for_scheduler_.reset();
terminate_sync_load_event_.Signal();
if (!worker_thread_) {
// Worker has been terminated before any backing thread was attached to the
// messaging proxy.
keep_alive_.Clear();
return;
}
worker_thread_->Terminate();
DevToolsAgent::WorkerThreadTerminated(execution_context_.Get(),
worker_thread_.get());
}
ExecutionContext* ThreadedMessagingProxyBase::GetExecutionContext() const {
DCHECK(IsParentContextThread());
return execution_context_;
}
ParentExecutionContextTaskRunners*
ThreadedMessagingProxyBase::GetParentExecutionContextTaskRunners() const {
DCHECK(IsParentContextThread());
return parent_execution_context_task_runners_;
}
WorkerThread* ThreadedMessagingProxyBase::GetWorkerThread() const {
DCHECK(IsParentContextThread());
return worker_thread_.get();
}
bool ThreadedMessagingProxyBase::IsParentContextThread() const {
return execution_context_->IsContextThread();
}
} // namespace blink
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