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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_UPDATER_IPC_PROXY_IMPL_BASE_WIN_H_
#define CHROME_UPDATER_IPC_PROXY_IMPL_BASE_WIN_H_
#include <wrl/client.h>
#include <ios>
#include <utility>
#include "base/check.h"
#include "base/debug/alias.h"
#include "base/functional/callback.h"
#include "base/logging.h"
#include "base/memory/scoped_refptr.h"
#include "base/sequence_checker.h"
#include "base/task/bind_post_task.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool.h"
#include "base/threading/platform_thread.h"
#include "base/types/expected.h"
#include "base/types/expected_macros.h"
#include "base/win/win_util.h"
#include "chrome/updater/updater_scope.h"
#include "chrome/updater/util/win_util.h"
#include "chrome/updater/win/win_constants.h"
namespace updater {
// `iid_user` and `iid_system` are the interface ids corresponding to
// `Interface` for user and system. These interface ids must be different for
// COM automation marshaling to work correctly.
template <typename Derived,
typename Interface,
REFIID iid_user,
REFIID iid_system>
class ProxyImplBase {
public:
// Releases `impl` on `task_runner_`.
static void Destroy(scoped_refptr<Derived> impl) {
impl->task_runner_->ReleaseSoon(FROM_HERE, std::move(impl));
}
protected:
explicit ProxyImplBase(UpdaterScope scope) : scope_(scope) {
DETACH_FROM_SEQUENCE(sequence_checker_);
VLOG(3) << __func__ << ": Interface: " << typeid(Interface).name()
<< ": iid_user: " << StringFromGuid(iid_user)
<< ": iid_system: " << StringFromGuid(iid_system)
<< ": scope: " << scope;
}
~ProxyImplBase() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
VLOG(2) << __func__;
}
void PostRPCTask(base::OnceClosure task) {
task_runner_->PostTask(FROM_HERE, std::move(task));
}
HResultOr<Microsoft::WRL::ComPtr<Interface>> CreateInterface() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// Retry creating the object if the call fails. Don't retry if
// the error is `REGDB_E_CLASSNOTREG` because the error can occur during
// normal operation and retrying on registration issues does not help.
const auto create_server =
[](REFCLSID clsid) -> HResultOr<Microsoft::WRL::ComPtr<IUnknown>> {
static constexpr int kNumTries = 2;
HRESULT hr = E_FAIL;
for (int i = 0; i != kNumTries; ++i) {
Microsoft::WRL::ComPtr<IUnknown> server;
hr = ::CoCreateInstance(clsid, nullptr, CLSCTX_LOCAL_SERVER,
IID_PPV_ARGS(&server));
if (SUCCEEDED(hr)) {
return server;
}
VLOG(2) << "::CoCreateInstance failed: " << StringFromGuid(clsid)
<< ": " << std::hex << hr;
if (hr == REGDB_E_CLASSNOTREG) {
return base::unexpected(hr);
}
// Sleep before trying again.
base::PlatformThread::Sleep(kCreateUpdaterInstanceDelay);
}
return base::unexpected(hr);
};
ASSIGN_OR_RETURN(Microsoft::WRL::ComPtr<IUnknown> server,
create_server(Derived::GetClassGuid(scope_)));
Microsoft::WRL::ComPtr<Interface> server_interface;
REFIID iid = IsSystemInstall(scope_) ? iid_system : iid_user;
const HRESULT hr =
server.CopyTo(iid, IID_PPV_ARGS_Helper(&server_interface));
if (SUCCEEDED(hr)) {
return server_interface;
}
VLOG(2) << "Failed to query the interface: " << StringFromGuid(iid) << ": "
<< std::hex << hr;
return base::unexpected(hr);
}
HRESULT hresult() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
CHECK(!interface_.has_value());
return interface_.error();
}
Microsoft::WRL::ComPtr<Interface> get_interface() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
CHECK(interface_.has_value());
return interface_.value();
}
UpdaterScope scope() const { return scope_; }
HRESULT ConnectToServer() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (interface_.has_value()) {
return S_OK;
}
interface_ = CreateInterface();
return interface_.has_value() ? S_OK : interface_.error();
}
// Bound to the `task_runner_` sequence.
SEQUENCE_CHECKER(sequence_checker_);
private:
// Sequences the outbound calls so that the main sequence is not blocked on an
// RPC call.
scoped_refptr<base::SequencedTaskRunner> task_runner_ =
base::ThreadPool::CreateSequencedTaskRunner(
{base::TaskPriority::USER_BLOCKING,
base::TaskShutdownBehavior::BLOCK_SHUTDOWN,
base::WithBaseSyncPrimitives(), base::MayBlock()});
const UpdaterScope scope_;
HResultOr<Microsoft::WRL::ComPtr<Interface>> interface_ =
base::unexpected(S_OK);
};
} // namespace updater
#endif // CHROME_UPDATER_IPC_PROXY_IMPL_BASE_WIN_H_
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