cef/libcef/browser/main_runner.cc

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// Copyright 2020 The Chromium Embedded Framework Authors.
// Portions copyright 2014 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 "libcef/browser/main_runner.h"
#include "libcef/browser/browser_message_loop.h"
#include "libcef/browser/thread_util.h"
#include "libcef/common/alloy/alloy_main_runner_delegate.h"
#include "libcef/common/cef_switches.h"
#include "libcef/common/chrome/chrome_main_runner_delegate.h"
#include "libcef/features/runtime.h"
#include "base/at_exit.h"
#include "base/base_switches.h"
#include "base/command_line.h"
#include "base/debug/debugger.h"
#include "base/run_loop.h"
#include "base/sequence_checker.h"
#include "base/synchronization/lock.h"
#include "base/synchronization/waitable_event.h"
#include "base/threading/thread.h"
#include "content/app/content_service_manager_main_delegate.h"
#include "content/browser/scheduler/browser_task_executor.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/common/content_switches.h"
#include "services/service_manager/embedder/main.h"
#if defined(OS_WIN)
#include <Objbase.h>
#include <windows.h>
#include "content/public/app/sandbox_helper_win.h"
#include "sandbox/win/src/sandbox_types.h"
#endif
#if defined(OS_MAC) || defined(OS_WIN)
#include "components/crash/core/app/crash_switches.h"
#include "third_party/crashpad/crashpad/handler/handler_main.h"
#endif
namespace {
enum class RuntimeType {
UNINITIALIZED,
ALLOY,
CHROME,
};
RuntimeType g_runtime_type = RuntimeType::UNINITIALIZED;
std::unique_ptr<CefMainRunnerDelegate> MakeDelegate(
RuntimeType type,
CefMainRunnerHandler* runner,
CefSettings* settings,
CefRefPtr<CefApp> application) {
if (type == RuntimeType::ALLOY) {
g_runtime_type = RuntimeType::ALLOY;
return std::make_unique<AlloyMainRunnerDelegate>(runner, settings,
application);
} else {
g_runtime_type = RuntimeType::CHROME;
return std::make_unique<ChromeMainRunnerDelegate>(runner, settings,
application);
}
}
#if defined(OS_MAC) || defined(OS_WIN)
// Based on components/crash/core/app/run_as_crashpad_handler_win.cc
// Remove the "--type=crashpad-handler" command-line flag that will otherwise
// confuse the crashpad handler.
// Chrome uses an embedded crashpad handler on Windows only and imports this
// function via the existing "run_as_crashpad_handler" target defined in
// components/crash/core/app/BUILD.gn. CEF uses an embedded handler on both
// Windows and macOS so we define the function here instead of using the
// existing target (because we can't use that target on macOS).
int RunAsCrashpadHandler(const base::CommandLine& command_line) {
base::CommandLine::StringVector argv = command_line.argv();
const base::CommandLine::StringType process_type =
FILE_PATH_LITERAL("--type=");
argv.erase(
std::remove_if(argv.begin(), argv.end(),
[&process_type](const base::CommandLine::StringType& str) {
return base::StartsWith(str, process_type,
base::CompareCase::SENSITIVE) ||
(!str.empty() && str[0] == L'/');
}),
argv.end());
#if defined(OS_MAC)
// HandlerMain on macOS uses the system version of getopt_long which expects
// the first argument to be the program name.
argv.insert(argv.begin(), command_line.GetProgram().value());
#endif
std::unique_ptr<char*[]> argv_as_utf8(new char*[argv.size() + 1]);
std::vector<std::string> storage;
storage.reserve(argv.size());
for (size_t i = 0; i < argv.size(); ++i) {
#if defined(OS_WIN)
storage.push_back(base::UTF16ToUTF8(argv[i]));
#else
storage.push_back(argv[i]);
#endif
argv_as_utf8[i] = &storage[i][0];
}
argv_as_utf8[argv.size()] = nullptr;
argv.clear();
return crashpad::HandlerMain(static_cast<int>(storage.size()),
argv_as_utf8.get(), nullptr);
}
#endif // defined(OS_MAC) || defined(OS_WIN)
} // namespace
// Used to run the UI on a separate thread.
class CefUIThread : public base::PlatformThread::Delegate {
public:
CefUIThread(CefMainRunner* runner, base::OnceClosure setup_callback)
: runner_(runner), setup_callback_(std::move(setup_callback)) {}
~CefUIThread() override { Stop(); }
void Start() {
base::AutoLock lock(thread_lock_);
bool success = base::PlatformThread::CreateWithPriority(
0, this, &thread_, base::ThreadPriority::NORMAL);
if (!success) {
LOG(FATAL) << "failed to UI create thread";
}
}
void Stop() {
base::AutoLock lock(thread_lock_);
if (!stopping_) {
stopping_ = true;
CEF_POST_TASK(CEF_UIT, base::BindOnce(&CefMainRunner::QuitMessageLoop,
base::Unretained(runner_)));
}
// Can't join if the |thread_| is either already gone or is non-joinable.
if (thread_.is_null())
return;
base::PlatformThread::Join(thread_);
thread_ = base::PlatformThreadHandle();
stopping_ = false;
}
bool WaitUntilThreadStarted() const {
DCHECK(owning_sequence_checker_.CalledOnValidSequence());
start_event_.Wait();
return true;
}
void InitializeBrowserRunner(
const content::MainFunctionParams& main_function_params) {
// Use our own browser process runner.
browser_runner_ = content::BrowserMainRunner::Create();
// Initialize browser process state. Uses the current thread's message loop.
int exit_code = browser_runner_->Initialize(main_function_params);
CHECK_EQ(exit_code, -1);
}
protected:
void ThreadMain() override {
base::PlatformThread::SetName("CefUIThread");
#if defined(OS_WIN)
// Initializes the COM library on the current thread.
CoInitialize(nullptr);
#endif
start_event_.Signal();
std::move(setup_callback_).Run();
runner_->RunMessageLoop();
browser_runner_->Shutdown();
browser_runner_.reset();
content::BrowserTaskExecutor::Shutdown();
// Run exit callbacks on the UI thread to avoid sequence check failures.
base::AtExitManager::ProcessCallbacksNow();
#if defined(OS_WIN)
// Closes the COM library on the current thread. CoInitialize must
// be balanced by a corresponding call to CoUninitialize.
CoUninitialize();
#endif
}
CefMainRunner* const runner_;
base::OnceClosure setup_callback_;
std::unique_ptr<content::BrowserMainRunner> browser_runner_;
bool stopping_ = false;
// The thread's handle.
base::PlatformThreadHandle thread_;
mutable base::Lock thread_lock_; // Protects |thread_|.
mutable base::WaitableEvent start_event_;
// This class is not thread-safe, use this to verify access from the owning
// sequence of the Thread.
base::SequenceChecker owning_sequence_checker_;
};
CefMainRunner::CefMainRunner(bool multi_threaded_message_loop,
bool external_message_pump)
: multi_threaded_message_loop_(multi_threaded_message_loop),
external_message_pump_(external_message_pump) {}
CefMainRunner::~CefMainRunner() = default;
bool CefMainRunner::Initialize(CefSettings* settings,
CefRefPtr<CefApp> application,
const CefMainArgs& args,
void* windows_sandbox_info,
bool* initialized,
base::OnceClosure context_initialized) {
DCHECK(!main_delegate_);
main_delegate_ = MakeDelegate(
settings->chrome_runtime ? RuntimeType::CHROME : RuntimeType::ALLOY, this,
settings, application);
const int exit_code =
ContentMainInitialize(args, windows_sandbox_info, &settings->no_sandbox);
if (exit_code >= 0) {
NOTREACHED() << "ContentMainInitialize failed";
return false;
}
if (!ContentMainRun(initialized, std::move(context_initialized))) {
NOTREACHED() << "ContentMainRun failed";
return false;
}
return true;
}
void CefMainRunner::Shutdown(base::OnceClosure shutdown_on_ui_thread,
base::OnceClosure finalize_shutdown) {
if (multi_threaded_message_loop_) {
// Events that will be used to signal when shutdown is complete. Start in
// non-signaled mode so that the event will block.
base::WaitableEvent uithread_shutdown_event(
base::WaitableEvent::ResetPolicy::AUTOMATIC,
base::WaitableEvent::InitialState::NOT_SIGNALED);
// Finish shutdown on the UI thread.
CEF_POST_TASK(
CEF_UIT,
base::BindOnce(&CefMainRunner::FinishShutdownOnUIThread,
base::Unretained(this), std::move(shutdown_on_ui_thread),
&uithread_shutdown_event));
/// Block until UI thread shutdown is complete.
uithread_shutdown_event.Wait();
FinalizeShutdown(std::move(finalize_shutdown));
} else {
// Finish shutdown on the current thread, which should be the UI thread.
FinishShutdownOnUIThread(std::move(shutdown_on_ui_thread), nullptr);
FinalizeShutdown(std::move(finalize_shutdown));
}
}
void CefMainRunner::RunMessageLoop() {
base::RunLoop run_loop;
DCHECK(quit_when_idle_callback_.is_null());
quit_when_idle_callback_ = run_loop.QuitWhenIdleClosure();
main_delegate_->BeforeMainMessageLoopRun(&run_loop);
// Blocks until QuitMessageLoop() is called.
run_loop.Run();
}
void CefMainRunner::QuitMessageLoop() {
if (!quit_when_idle_callback_.is_null()) {
if (main_delegate_->HandleMainMessageLoopQuit())
return;
std::move(quit_when_idle_callback_).Run();
}
}
// static
int CefMainRunner::RunAsHelperProcess(const CefMainArgs& args,
CefRefPtr<CefApp> application,
void* windows_sandbox_info) {
base::CommandLine command_line(base::CommandLine::NO_PROGRAM);
#if defined(OS_WIN)
command_line.ParseFromString(::GetCommandLineW());
#else
command_line.InitFromArgv(args.argc, args.argv);
#endif
// Wait for the debugger as early in process initialization as possible.
if (command_line.HasSwitch(switches::kWaitForDebugger))
base::debug::WaitForDebugger(60, true);
// If no process type is specified then it represents the browser process and
// we do nothing.
const std::string& process_type =
command_line.GetSwitchValueASCII(switches::kProcessType);
if (process_type.empty())
return -1;
auto runtime_type = command_line.HasSwitch(switches::kEnableChromeRuntime)
? RuntimeType::CHROME
: RuntimeType::ALLOY;
auto main_delegate = MakeDelegate(runtime_type, /*runner=*/nullptr,
/*settings=*/nullptr, application);
main_delegate->BeforeExecuteProcess(args);
int result;
#if defined(OS_MAC) || defined(OS_WIN)
if (process_type == crash_reporter::switches::kCrashpadHandler) {
result = RunAsCrashpadHandler(command_line);
main_delegate->AfterExecuteProcess();
return result;
}
#endif
// Execute the secondary process.
content::ContentMainParams params(main_delegate->GetContentMainDelegate());
#if defined(OS_WIN)
sandbox::SandboxInterfaceInfo sandbox_info = {0};
if (windows_sandbox_info == nullptr) {
content::InitializeSandboxInfo(&sandbox_info);
windows_sandbox_info = &sandbox_info;
}
params.instance = args.instance;
params.sandbox_info =
static_cast<sandbox::SandboxInterfaceInfo*>(windows_sandbox_info);
#else
params.argc = args.argc;
params.argv = const_cast<const char**>(args.argv);
#endif
result = content::ContentMain(params);
main_delegate->AfterExecuteProcess();
return result;
}
int CefMainRunner::ContentMainInitialize(const CefMainArgs& args,
void* windows_sandbox_info,
int* no_sandbox) {
main_delegate_->BeforeMainThreadInitialize(args);
// Initialize the content runner.
content::ContentMainParams params(main_delegate_->GetContentMainDelegate());
#if defined(OS_WIN)
sandbox::SandboxInterfaceInfo sandbox_info = {0};
if (windows_sandbox_info == nullptr) {
windows_sandbox_info = &sandbox_info;
*no_sandbox = true;
}
params.instance = args.instance;
params.sandbox_info =
static_cast<sandbox::SandboxInterfaceInfo*>(windows_sandbox_info);
#else
params.argc = args.argc;
params.argv = const_cast<const char**>(args.argv);
#endif
sm_main_delegate_.reset(
new content::ContentServiceManagerMainDelegate(params));
sm_main_params_.reset(
new service_manager::MainParams(sm_main_delegate_.get()));
#if defined(OS_POSIX) && !defined(OS_ANDROID)
sm_main_params_->argc = params.argc;
sm_main_params_->argv = params.argv;
#endif
return service_manager::MainInitialize(*sm_main_params_);
}
bool CefMainRunner::ContentMainRun(bool* initialized,
base::OnceClosure context_initialized) {
main_delegate_->BeforeMainThreadRun();
if (multi_threaded_message_loop_) {
base::WaitableEvent uithread_startup_event(
base::WaitableEvent::ResetPolicy::AUTOMATIC,
base::WaitableEvent::InitialState::NOT_SIGNALED);
if (!CreateUIThread(base::BindOnce(
[](CefMainRunner* runner, base::WaitableEvent* event) {
service_manager::MainRun(*runner->sm_main_params_);
event->Signal();
},
base::Unretained(this),
base::Unretained(&uithread_startup_event)))) {
return false;
}
*initialized = true;
// We need to wait until service_manager::MainRun has finished.
uithread_startup_event.Wait();
} else {
*initialized = true;
service_manager::MainRun(*sm_main_params_);
}
if (CEF_CURRENTLY_ON_UIT()) {
OnContextInitialized(std::move(context_initialized));
} else {
// Continue initialization on the UI thread.
CEF_POST_TASK(CEF_UIT, base::BindOnce(&CefMainRunner::OnContextInitialized,
base::Unretained(this),
std::move(context_initialized)));
}
return true;
}
void CefMainRunner::PreCreateMainMessageLoop() {
if (external_message_pump_) {
InitExternalMessagePumpFactoryForUI();
}
}
int CefMainRunner::RunMainProcess(
const content::MainFunctionParams& main_function_params) {
if (!multi_threaded_message_loop_) {
// Use our own browser process runner.
browser_runner_ = content::BrowserMainRunner::Create();
// Initialize browser process state. Results in a call to
// AlloyBrowserMain::PreMainMessageLoopStart() which creates the UI message
// loop.
int exit_code = browser_runner_->Initialize(main_function_params);
if (exit_code >= 0)
return exit_code;
} else {
// Running on the separate UI thread.
DCHECK(ui_thread_);
ui_thread_->InitializeBrowserRunner(main_function_params);
}
return 0;
}
bool CefMainRunner::CreateUIThread(base::OnceClosure setup_callback) {
DCHECK(!ui_thread_);
ui_thread_.reset(new CefUIThread(this, std::move(setup_callback)));
ui_thread_->Start();
ui_thread_->WaitUntilThreadStarted();
if (external_message_pump_) {
InitExternalMessagePumpFactoryForUI();
}
return true;
}
void CefMainRunner::OnContextInitialized(
base::OnceClosure context_initialized) {
CEF_REQUIRE_UIT();
main_delegate_->AfterUIThreadInitialize();
std::move(context_initialized).Run();
}
void CefMainRunner::FinishShutdownOnUIThread(
base::OnceClosure shutdown_on_ui_thread,
base::WaitableEvent* uithread_shutdown_event) {
CEF_REQUIRE_UIT();
sm_main_delegate_->ShutdownOnUIThread();
std::move(shutdown_on_ui_thread).Run();
main_delegate_->AfterUIThreadShutdown();
if (uithread_shutdown_event)
uithread_shutdown_event->Signal();
}
void CefMainRunner::FinalizeShutdown(base::OnceClosure finalize_shutdown) {
main_delegate_->BeforeMainThreadShutdown();
if (browser_runner_.get()) {
browser_runner_->Shutdown();
browser_runner_.reset();
}
if (ui_thread_.get()) {
// Blocks until the thread has stopped.
ui_thread_->Stop();
ui_thread_.reset();
}
// Shut down the content runner.
service_manager::MainShutdown(*sm_main_params_);
sm_main_params_.reset();
sm_main_delegate_.reset();
std::move(finalize_shutdown).Run();
main_delegate_->AfterMainThreadShutdown();
main_delegate_.reset();
g_runtime_type = RuntimeType::UNINITIALIZED;
}
// From libcef/features/runtime.h:
namespace cef {
bool IsAlloyRuntimeEnabled() {
return g_runtime_type == RuntimeType::ALLOY;
}
bool IsChromeRuntimeEnabled() {
return g_runtime_type == RuntimeType::CHROME;
}
} // namespace cef