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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/dbus/common/blocking_method_caller.h"
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/location.h"
#include "base/task/task_runner.h"
#include "base/threading/thread_restrictions.h"
#include "dbus/bus.h"
#include "dbus/error.h"
#include "dbus/object_proxy.h"
namespace chromeos {
namespace {
// This function is a part of CallMethodAndBlock implementation.
void CallMethodAndBlockInternal(
dbus::ObjectProxy* proxy,
dbus::MethodCall* method_call,
base::expected<std::unique_ptr<dbus::Response>, dbus::Error>* result) {
*result = proxy->CallMethodAndBlock(method_call,
dbus::ObjectProxy::TIMEOUT_USE_DEFAULT);
}
} // namespace
BlockingMethodCaller::BlockingMethodCaller(dbus::Bus* bus,
dbus::ObjectProxy* proxy)
: bus_(bus), proxy_(proxy) {}
BlockingMethodCaller::~BlockingMethodCaller() = default;
base::expected<std::unique_ptr<dbus::Response>, dbus::Error>
BlockingMethodCaller::CallMethodAndBlock(dbus::MethodCall* method_call) {
base::WaitableEvent on_complete;
base::expected<std::unique_ptr<dbus::Response>, dbus::Error> result;
bus_->GetDBusTaskRunner()->PostTask(
FROM_HERE,
base::BindOnce(&CallMethodAndBlockInternal, base::Unretained(proxy_),
base::Unretained(method_call), base::Unretained(&result))
// After the Callback is called, signal `on_complete` to unblock
// this thread.
.Then(base::BindOnce(&base::WaitableEvent::Signal,
base::Unretained(&on_complete))));
// http://crbug.com/125360
base::ScopedAllowBaseSyncPrimitivesOutsideBlockingScope allow_wait;
on_complete.Wait();
return result;
}
} // namespace chromeos
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