arc-bridge: Add the ARC Bridge Service

components/arc/arc_bridge_service_unittest.cc

Index: components/arc/arc_bridge_service_unittest.cc
diff --git a/components/arc/arc_bridge_service_unittest.cc b/components/arc/arc_bridge_service_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..50b4c81e6836ceeda538a6dc9db8855e6d80f3aa
--- /dev/null
+++ b/components/arc/arc_bridge_service_unittest.cc
@@ -0,0 +1,184 @@
+// Copyright 2015 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 "components/arc/arc_bridge_service.h"
+
+#include "base/memory/ref_counted.h"
+#include "base/run_loop.h"
+#include "chromeos/dbus/dbus_thread_manager.h"
+#include "components/arc/common/arc_host_messages.h"
+#include "ipc/ipc_channel.h"
+#include "ipc/ipc_channel_proxy.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace arc {
+
+namespace {
+
+// A fake sender that can connect to a specified IPC::ChannelHandle.
+class IPCSenderFake : public IPC::Listener, public IPC::Sender {
+ public:
+  explicit IPCSenderFake(
+      const scoped_refptr<base::SingleThreadTaskRunner>& ipc_task_runner)
+      : ipc_task_runner_(ipc_task_runner) {}
+  ~IPCSenderFake() override {}
+
+  // Connects as a client to the specified |handle|.
+  bool Connect(const IPC::ChannelHandle& handle) {
+    ipc_channel_ = IPC::ChannelProxy::Create(handle, IPC::Channel::MODE_CLIENT,
+                                             this, ipc_task_runner_.get());
+    return ipc_channel_;
+  }
+
+  bool Send(IPC::Message* msg) override { return ipc_channel_->Send(msg); }
+
+  bool OnMessageReceived(const IPC::Message& message) override { return true; }
+
+ private:
+  // Task runner on which ipc operations are performed.
+  scoped_refptr<base::SingleThreadTaskRunner> ipc_task_runner_;
+
+  // The channel through which messages are sent.
+  scoped_ptr<IPC::ChannelProxy> ipc_channel_;
+
+  DISALLOW_COPY_AND_ASSIGN(IPCSenderFake);
+};
+
+}  // namespace
+
+class ArcBridgeTest : public testing::Test, public ArcBridgeService::Observer {
+ public:
+  ArcBridgeTest() : ready_(false) {}
+  ~ArcBridgeTest() override {}
+
+  void OnStateChanged(ArcBridgeService::State state) override {
+    state_ = state;
+    switch (state) {
+      case ArcBridgeService::State::READY:
+        ready_ = true;
+        break;
+
+      case ArcBridgeService::State::STOPPED:
+        message_loop_.PostTask(FROM_HERE, message_loop_.QuitWhenIdleClosure());
+        break;
+
+      default:
+        break;
+    }
+  }
+
+  bool ready() const { return ready_; }
+
+  ArcBridgeService::State state() const { return state_; }
+
+ protected:
+  scoped_ptr<IPCSenderFake> fake_sender_;
+
+  scoped_ptr<ArcBridgeService> service_;
+
+ private:
+  void SetUp() override {
+    chromeos::DBusThreadManager::Initialize();
+
+    ready_ = false;
+
+    ipc_thread_.reset(new base::Thread("IPC thread"));
+    ipc_thread_->StartWithOptions(
+        base::Thread::Options(base::MessageLoop::TYPE_IO, 0));
+    service_.reset(new ArcBridgeService(ipc_thread_->task_runner(),
+                                        message_loop_.task_runner()));
+
+    service_->AddObserver(this);
+
+    IPC::ChannelHandle handle(IPC::Channel::GenerateUniqueRandomChannelID());
+    // Testing code does not do all the steps that are done by regular
+    // connection. In particular, it does not need to create a directory for
+    // the socket, so manually set the state to CONNECTING.
+    service_->SetState(ArcBridgeService::State::CONNECTING);
+    // Connect directly to the specified channel instead of going through
+    // D-Bus, since it is not available for tests.
+    EXPECT_TRUE(service_->Connect(handle, IPC::Channel::MODE_SERVER));
+    // Testing code does also not send D-Bus messages, so set the state to
+    // STARTING.
+    service_->SetState(ArcBridgeService::State::STARTING);
+    fake_sender_.reset(new IPCSenderFake(ipc_thread_->task_runner()));
+    EXPECT_TRUE(fake_sender_);
+    EXPECT_TRUE(fake_sender_->Connect(handle));
+  }
+
+  void TearDown() override {
+    fake_sender_.reset();
+    service_->RemoveObserver(this);
+    service_.reset();
+    ipc_thread_.reset();
+
+    chromeos::DBusThreadManager::Shutdown();
+  }
+
+  bool ready_;
+  ArcBridgeService::State state_;
+  base::MessageLoopForUI message_loop_;
+
+  // Thread in which IPC messaging is performed.
+  scoped_ptr<base::Thread> ipc_thread_;
+
+  DISALLOW_COPY_AND_ASSIGN(ArcBridgeTest);
+};
+
+// Shuts down the ArcBridgeService when it is ready.
+class ScopedShutdownWhenReady : public ArcBridgeService::Observer {
+ public:
+  ScopedShutdownWhenReady(ArcBridgeService* service) : service_(service) {
+    service_->AddObserver(this);
+  }
+
+  ~ScopedShutdownWhenReady() override { service_->RemoveObserver(this); }
+
+  void OnStateChanged(ArcBridgeService::State state) override {
+    if (state == ArcBridgeService::State::READY) {
+      service_->Shutdown();
+    }
+  }
+
+ private:
+  ArcBridgeService* service_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedShutdownWhenReady);
+};
+
+// Exercises the basic functionality of the ARC Bridge Service.  A message from
+// within the instance should cause the observer to be notified.
+TEST_F(ArcBridgeTest, Basic) {
+  ASSERT_FALSE(ready());
+  ASSERT_EQ(ArcBridgeService::State::STARTING, state());
+
+  ScopedShutdownWhenReady shutdown(service_.get());
+
+  ASSERT_TRUE(fake_sender_->Send(new ArcInstanceHostMsg_InstanceReady()));
+
+  base::RunLoop run_loop;
+  run_loop.Run();
+
+  EXPECT_TRUE(ready());
+  ASSERT_EQ(ArcBridgeService::State::STOPPED, state());
+}
+
+// If the ArcBridgeService is shut down, it should be stopped, even
+// mid-startup.
+TEST_F(ArcBridgeTest, ShutdownMidStartup) {
+  ASSERT_FALSE(ready());
+
+  ASSERT_EQ(ArcBridgeService::State::STARTING, state());
+  service_->Shutdown();
+  // Some machines can reach the STOPPED state immediately.
+  ASSERT_TRUE(state() == ArcBridgeService::State::STOPPING ||
+              state() == ArcBridgeService::State::STOPPED);
+
+  base::RunLoop run_loop;
+  run_loop.Run();
+
+  ASSERT_EQ(ArcBridgeService::State::STOPPED, state());
+}
+
+}  // namespace arc