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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 <memory>
#include <string>
#include <utility>
#include "base/functional/callback.h"
#include "base/logging.h"
#include "base/memory/ref_counted.h"
#include "base/task/single_thread_task_runner.h"
#include "dbus/message.h"
#include "dbus/mock_bus.h"
#include "dbus/mock_object_proxy.h"
#include "dbus/object_path.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
using ::testing::_;
using ::testing::Invoke;
using ::testing::Return;
namespace chromeos {
namespace {
class FakeTaskRunner : public base::SingleThreadTaskRunner {
public:
// base::SingleThreadTaskRunner:
bool PostDelayedTask(const base::Location& from_here,
base::OnceClosure task,
base::TimeDelta delay) override {
std::move(task).Run();
return true;
}
bool PostNonNestableDelayedTask(const base::Location& from_here,
base::OnceClosure task,
base::TimeDelta delay) override {
return PostDelayedTask(from_here, std::move(task), delay);
}
bool RunsTasksInCurrentSequence() const override { return true; }
protected:
~FakeTaskRunner() override = default;
};
} // namespace
class BlockingMethodCallerTest : public testing::Test {
public:
BlockingMethodCallerTest() : task_runner_(new FakeTaskRunner) {}
void SetUp() override {
// Create a mock bus.
dbus::Bus::Options options;
options.bus_type = dbus::Bus::SYSTEM;
mock_bus_ = new dbus::MockBus(options);
// Create a mock proxy.
mock_proxy_ =
new dbus::MockObjectProxy(mock_bus_.get(), "org.chromium.TestService",
dbus::ObjectPath("/org/chromium/TestObject"));
// Set an expectation so mock_proxy's CallMethodAndBlock() will use
// CreateMockProxyResponse() to return responses.
EXPECT_CALL(*mock_proxy_.get(), CallMethodAndBlock(_, _))
.WillRepeatedly(
Invoke(this, &BlockingMethodCallerTest::CreateMockProxyResponse));
// Set an expectation so mock_bus's GetObjectProxy() for the given
// service name and the object path will return mock_proxy_.
EXPECT_CALL(*mock_bus_.get(),
GetObjectProxy("org.chromium.TestService",
dbus::ObjectPath("/org/chromium/TestObject")))
.WillOnce(Return(mock_proxy_.get()));
// Set an expectation so mock_bus's GetDBusTaskRunner will return the fake
// task runner.
EXPECT_CALL(*mock_bus_.get(), GetDBusTaskRunner())
.WillRepeatedly(Return(task_runner_.get()));
// ShutdownAndBlock() will be called in TearDown().
EXPECT_CALL(*mock_bus_.get(), ShutdownAndBlock()).WillOnce(Return());
}
void TearDown() override { mock_bus_->ShutdownAndBlock(); }
protected:
scoped_refptr<FakeTaskRunner> task_runner_;
scoped_refptr<dbus::MockBus> mock_bus_;
scoped_refptr<dbus::MockObjectProxy> mock_proxy_;
private:
// Returns a response for the given method call. Used to implement
// CallMethodAndBlock() for |mock_proxy_|.
base::expected<std::unique_ptr<dbus::Response>, dbus::Error>
CreateMockProxyResponse(dbus::MethodCall* method_call, int timeout_ms) {
if (method_call->GetInterface() == "org.chromium.TestInterface" &&
method_call->GetMember() == "Echo") {
dbus::MessageReader reader(method_call);
std::string text_message;
if (reader.PopString(&text_message)) {
std::unique_ptr<dbus::Response> response =
dbus::Response::CreateEmpty();
dbus::MessageWriter writer(response.get());
writer.AppendString(text_message);
return base::ok(std::move(response));
}
}
LOG(ERROR) << "Unexpected method call: " << method_call->ToString();
return base::unexpected(dbus::Error());
}
};
TEST_F(BlockingMethodCallerTest, Echo) {
const char kHello[] = "Hello";
// Get an object proxy from the mock bus.
dbus::ObjectProxy* proxy = mock_bus_->GetObjectProxy(
"org.chromium.TestService", dbus::ObjectPath("/org/chromium/TestObject"));
// Create a method call.
dbus::MethodCall method_call("org.chromium.TestInterface", "Echo");
dbus::MessageWriter writer(&method_call);
writer.AppendString(kHello);
// Call the method.
BlockingMethodCaller blocking_method_caller(mock_bus_.get(), proxy);
auto result = blocking_method_caller.CallMethodAndBlock(&method_call);
ASSERT_TRUE(result.has_value());
// Check the response.
ASSERT_TRUE(result->get());
dbus::MessageReader reader(result->get());
std::string text_message;
ASSERT_TRUE(reader.PopString(&text_message));
// The text message should be echo'ed back.
EXPECT_EQ(kHello, text_message);
}
} // namespace chromeos
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