chromeos: Implement the new D-Bus client for update engine.

This is part 1 of the UpdateLibrary to UpdateEngineClient migration.
The new files are added but not used from Chrome yet.

The new code is based on update_library.cc and chromeos_update_engine.cc,
and the new code will replace the them.

For code review, please refer to the files below:

http://src.chromium.org/viewvc/chrome/trunk/src/chrome/browser/chromeos/cros/update_library.h?view=markup
http://src.chromium.org/viewvc/chrome/trunk/src/chrome/browser/chromeos/cros/update_library.cc?view=markup
http://git.chromium.org/gitweb/?p=chromiumos/platform/cros.git;a=blob;f=chromeos_update_engine.h;hb=HEAD
http://git.chromium.org/gitweb/?p=chromiumos/platform/cros.git;a=blob;f=chromeos_update_engine.cc;hb=HEAD

BUG=chromium-os:16564
TEST=chrome and tests build.

Review URL: http://codereview.chromium.org/8572020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110467 0039d316-1c4b-4281-b951-d872f2087c98

6 files changed, 460 insertions, 0 deletions

diff --git a/chrome/browser/chromeos/dbus/mock_update_engine_client.cc b/chrome/browser/chromeos/dbus/mock_update_engine_client.cc
new file mode 100644
index 0000000..93379d4
--- /dev/null
+++ b/chrome/browser/chromeos/dbus/mock_update_engine_client.cc
@@ -0,0 +1,13 @@
+// Copyright (c) 2011 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 "chrome/browser/chromeos/dbus/mock_update_engine_client.h"
+
+namespace chromeos {
+
+MockUpdateEngineClient::MockUpdateEngineClient() {}
+
+MockUpdateEngineClient::~MockUpdateEngineClient() {}
+
+}  // namespace chromeos
diff --git a/chrome/browser/chromeos/dbus/mock_update_engine_client.h b/chrome/browser/chromeos/dbus/mock_update_engine_client.h
new file mode 100644
index 0000000..21d6f4e
--- /dev/null
+++ b/chrome/browser/chromeos/dbus/mock_update_engine_client.h
@@ -0,0 +1,32 @@
+// Copyright (c) 2011 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.
+
+#ifndef CHROME_BROWSER_CHROMEOS_DBUS_MOCK_UPDATE_ENGINE_CLIENT_H_
+#define CHROME_BROWSER_CHROMEOS_DBUS_MOCK_UPDATE_ENGINE_CLIENT_H_
+
+#include <string>
+
+#include "chrome/browser/chromeos/dbus/update_engine_client.h"
+#include "testing/gmock/include/gmock/gmock.h"
+
+namespace chromeos {
+
+class MockUpdateEngineClient : public UpdateEngineClient {
+ public:
+  MockUpdateEngineClient();
+  virtual ~MockUpdateEngineClient();
+
+  MOCK_METHOD1(AddObserver, void(Observer*));
+  MOCK_METHOD1(RemoveObserver, void(Observer*));
+  MOCK_METHOD1(HasObserver, bool(Observer*));
+  MOCK_METHOD1(RequestUpdateCheck, void(UpdateCheckCallback));
+  MOCK_METHOD0(RebootAfterUpdate, void());
+  MOCK_METHOD1(SetReleaseTrack, void(const std::string&));
+  MOCK_METHOD1(GetReleaseTrack, void(GetReleaseTrackCallback));
+  MOCK_METHOD0(GetLastStatus, Status());
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_DBUS_MOCK_UPDATE_ENGINE_CLIENT_H_
diff --git a/chrome/browser/chromeos/dbus/update_engine_client.cc b/chrome/browser/chromeos/dbus/update_engine_client.cc
new file mode 100644
index 0000000..ed5cecb
--- /dev/null
+++ b/chrome/browser/chromeos/dbus/update_engine_client.cc
@@ -0,0 +1,289 @@
+// Copyright (c) 2011 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 "chrome/browser/chromeos/dbus/update_engine_client.h"
+
+#include "base/bind.h"
+#include "base/callback.h"
+#include "base/string_util.h"
+#include "chrome/browser/chromeos/system/runtime_environment.h"
+#include "dbus/bus.h"
+#include "dbus/message.h"
+#include "dbus/object_proxy.h"
+#include "third_party/cros_system_api/dbus/service_constants.h"
+
+namespace chromeos {
+namespace {
+
+// Returns UPDATE_STATUS_ERROR on error.
+UpdateEngineClient::UpdateStatusOperation UpdateStatusFromString(
+    const std::string& str) {
+  if (str == "UPDATE_STATUS_IDLE")
+    return UpdateEngineClient::UPDATE_STATUS_IDLE;
+  if (str == "UPDATE_STATUS_CHECKING_FOR_UPDATE")
+    return UpdateEngineClient::UPDATE_STATUS_CHECKING_FOR_UPDATE;
+  if (str == "UPDATE_STATUS_UPDATE_AVAILABLE")
+    return UpdateEngineClient::UPDATE_STATUS_UPDATE_AVAILABLE;
+  if (str == "UPDATE_STATUS_DOWNLOADING")
+    return UpdateEngineClient::UPDATE_STATUS_DOWNLOADING;
+  if (str == "UPDATE_STATUS_VERIFYING")
+    return UpdateEngineClient::UPDATE_STATUS_VERIFYING;
+  if (str == "UPDATE_STATUS_FINALIZING")
+    return UpdateEngineClient::UPDATE_STATUS_FINALIZING;
+  if (str == "UPDATE_STATUS_UPDATED_NEED_REBOOT")
+    return UpdateEngineClient::UPDATE_STATUS_UPDATED_NEED_REBOOT;
+  if (str == "UPDATE_STATUS_REPORTING_ERROR_EVENT")
+    return UpdateEngineClient::UPDATE_STATUS_REPORTING_ERROR_EVENT;
+  return UpdateEngineClient::UPDATE_STATUS_ERROR;
+}
+
+// Used in UpdateEngineClient::EmptyUpdateCheckCallback().
+void EmptyUpdateCheckCallbackBody(
+    UpdateEngineClient::UpdateCheckResult unused_result) {
+}
+
+}  // namespace
+
+// The UpdateEngineClient implementation used in production.
+class UpdateEngineClientImpl : public UpdateEngineClient {
+ public:
+  explicit UpdateEngineClientImpl(dbus::Bus* bus)
+      : update_engine_proxy_(NULL),
+        weak_ptr_factory_(this),
+        last_status_() {
+    update_engine_proxy_ = bus->GetObjectProxy(
+        update_engine::kUpdateEngineServiceName,
+        update_engine::kUpdateEngineServicePath);
+
+    // Monitor the D-Bus signal for brightness changes. Only the power
+    // manager knows the actual brightness level. We don't cache the
+    // brightness level in Chrome as it will make things less reliable.
+    update_engine_proxy_->ConnectToSignal(
+        update_engine::kUpdateEngineInterface,
+        update_engine::kStatusUpdate,
+        base::Bind(&UpdateEngineClientImpl::StatusUpdateReceived,
+                   weak_ptr_factory_.GetWeakPtr()),
+        base::Bind(&UpdateEngineClientImpl::StatusUpdateConnected,
+                   weak_ptr_factory_.GetWeakPtr()));
+  }
+
+  virtual ~UpdateEngineClientImpl() {
+  }
+
+  // UpdateEngineClient override.
+  virtual void AddObserver(Observer* observer) OVERRIDE {
+    observers_.AddObserver(observer);
+  }
+
+  // UpdateEngineClient override.
+  virtual void RemoveObserver(Observer* observer) OVERRIDE {
+    observers_.RemoveObserver(observer);
+  }
+
+  // UpdateEngineClient override.
+  virtual bool HasObserver(Observer* observer) OVERRIDE {
+    return observers_.HasObserver(observer);
+  }
+
+  // UpdateEngineClient override.
+  virtual void RequestUpdateCheck(UpdateCheckCallback callback) OVERRIDE {
+    dbus::MethodCall method_call(
+        update_engine::kUpdateEngineInterface,
+        update_engine::kAttemptUpdate);
+    dbus::MessageWriter writer(&method_call);
+    writer.AppendString("");  // Unused.
+    writer.AppendString("");  // Unused.
+
+    VLOG(1) << "Requesting an update check";
+    update_engine_proxy_->CallMethod(
+        &method_call,
+        dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
+        base::Bind(&UpdateEngineClientImpl::OnRequestUpdateCheck,
+                   weak_ptr_factory_.GetWeakPtr(),
+                   callback));
+  }
+
+  // UpdateEngineClient override.
+  virtual void RebootAfterUpdate() OVERRIDE {
+    dbus::MethodCall method_call(
+        update_engine::kUpdateEngineInterface,
+        update_engine::kRebootIfNeeded);
+
+    VLOG(1) << "Requesting a reboot";
+    update_engine_proxy_->CallMethod(
+        &method_call,
+        dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
+        base::Bind(&UpdateEngineClientImpl::OnRebootAfterUpdate,
+                   weak_ptr_factory_.GetWeakPtr()));
+  }
+
+  // UpdateEngineClient override.
+  virtual void SetReleaseTrack(const std::string& track) OVERRIDE {
+    dbus::MethodCall method_call(
+        update_engine::kUpdateEngineInterface,
+        update_engine::kSetTrack);
+    dbus::MessageWriter writer(&method_call);
+    writer.AppendString(track);
+
+    VLOG(1) << "Requesting to set the release track to " << track;
+    update_engine_proxy_->CallMethod(
+        &method_call,
+        dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
+        base::Bind(&UpdateEngineClientImpl::OnSetReleaseTrack,
+                   weak_ptr_factory_.GetWeakPtr()));
+  }
+
+  // UpdateEngineClient override.
+  virtual void GetReleaseTrack(GetReleaseTrackCallback callback) OVERRIDE {
+    dbus::MethodCall method_call(
+        update_engine::kUpdateEngineInterface,
+        update_engine::kGetTrack);
+
+    VLOG(1) << "Requesting to get the current release track";
+    update_engine_proxy_->CallMethod(
+        &method_call,
+        dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
+        base::Bind(&UpdateEngineClientImpl::OnGetReleaseTrack,
+                   weak_ptr_factory_.GetWeakPtr(),
+                   callback));
+  }
+
+  // UpdateEngineClient override.
+  virtual Status GetLastStatus() OVERRIDE {
+    return last_status_;
+  }
+
+ private:
+  // Called when a response for RequestUpdateCheck() is received.
+  void OnRequestUpdateCheck(UpdateCheckCallback callback,
+                            dbus::Response* response) {
+    if (!response) {
+      LOG(ERROR) << "Failed to request update check";
+      callback.Run(UPDATE_RESULT_FAILED);
+      return;
+    }
+    callback.Run(UPDATE_RESULT_SUCCESS);
+  }
+
+  // Called when a response for RebootAfterUpdate() is received.
+  void OnRebootAfterUpdate(dbus::Response* response) {
+    if (!response) {
+      LOG(ERROR) << "Failed to request rebooting after update";
+      return;
+    }
+  }
+
+  // Called when a response for SetReleaseTrack() is received.
+  void OnSetReleaseTrack(dbus::Response* response) {
+    if (!response) {
+      LOG(ERROR) << "Failed to request setting release track";
+      return;
+    }
+  }
+
+  // Called when a response for GetReleaseTrack() is received.
+  void OnGetReleaseTrack(GetReleaseTrackCallback callback,
+                         dbus::Response* response) {
+    if (!response) {
+      LOG(ERROR) << "Failed to request getting release track";
+      callback.Run("");
+      return;
+    }
+    dbus::MessageReader reader(response);
+    std::string release_track;
+    if (!reader.PopString(&release_track)) {
+      LOG(ERROR) << "Incorrect response: " << response->ToString();
+      callback.Run("");
+      return;
+    }
+    VLOG(1) << "The current release track received: " << release_track;
+    callback.Run(release_track);
+  }
+
+  // Called when a status update signal is received.
+  void StatusUpdateReceived(dbus::Signal* signal) {
+    VLOG(1) << "Status update signal received: " << signal->ToString();
+    dbus::MessageReader reader(signal);
+    int64 last_checked_time = 0;
+    double progress = 0.0;
+    std::string current_operation;
+    std::string new_version;
+    int64_t new_size = 0;
+    if (!(reader.PopInt64(&last_checked_time) &&
+          reader.PopDouble(&progress) &&
+          reader.PopString(&current_operation) &&
+          reader.PopString(&new_version) &&
+          reader.PopInt64(&new_size))) {
+      LOG(ERROR) << "Status changed signal had incorrect parameters: "
+                 << signal->ToString();
+      return;
+    }
+    Status status;
+    status.last_checked_time = last_checked_time;
+    status.download_progress = progress;
+    status.status = UpdateStatusFromString(current_operation);
+    status.new_version = new_version;
+    status.new_size = new_size;
+
+    last_status_ = status;
+    FOR_EACH_OBSERVER(Observer, observers_, UpdateStatusChanged(status));
+  }
+
+  // Called when the status update signal is initially connected.
+  void StatusUpdateConnected(const std::string& interface_name,
+                             const std::string& signal_name,
+                             bool success) {
+    LOG_IF(WARNING, !success)
+        << "Failed to connect to status updated signal.";
+  }
+
+  dbus::ObjectProxy* update_engine_proxy_;
+  ObserverList<Observer> observers_;
+  base::WeakPtrFactory<UpdateEngineClientImpl> weak_ptr_factory_;
+  Status last_status_;
+
+  DISALLOW_COPY_AND_ASSIGN(UpdateEngineClientImpl);
+};
+
+// The UpdateEngineClient implementation used on Linux desktop,
+// which does nothing.
+class UpdateEngineClientStubImpl : public UpdateEngineClient {
+  // UpdateEngineClient overrides.
+  virtual void AddObserver(Observer* observer) OVERRIDE {}
+  virtual void RemoveObserver(Observer* observer) OVERRIDE {}
+  virtual bool HasObserver(Observer* observer) OVERRIDE { return false; }
+
+  virtual void RequestUpdateCheck(UpdateCheckCallback callback) OVERRIDE {
+    callback.Run(UPDATE_RESULT_FAILED);
+  }
+  virtual void RebootAfterUpdate() OVERRIDE {}
+  virtual void SetReleaseTrack(const std::string& track) OVERRIDE {}
+  virtual void GetReleaseTrack(GetReleaseTrackCallback callback) OVERRIDE {
+    callback.Run("beta-channel");
+  }
+  virtual Status GetLastStatus() OVERRIDE { return Status(); }
+};
+
+UpdateEngineClient::UpdateEngineClient() {
+}
+
+UpdateEngineClient::~UpdateEngineClient() {
+}
+
+// static
+UpdateEngineClient::UpdateCheckCallback
+UpdateEngineClient::EmptyUpdateCheckCallback() {
+  return base::Bind(&EmptyUpdateCheckCallbackBody);
+}
+
+// static
+UpdateEngineClient* UpdateEngineClient::Create(dbus::Bus* bus) {
+  if (system::runtime_environment::IsRunningOnChromeOS()) {
+    return new UpdateEngineClientImpl(bus);
+  } else {
+    return new UpdateEngineClientStubImpl();
+  }
+}
+
+}  // namespace chromeos
diff --git a/chrome/browser/chromeos/dbus/update_engine_client.h b/chrome/browser/chromeos/dbus/update_engine_client.h
new file mode 100644
index 0000000..52d5d20
--- /dev/null
+++ b/chrome/browser/chromeos/dbus/update_engine_client.h
@@ -0,0 +1,122 @@
+// Copyright (c) 2011 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.
+
+#ifndef CHROME_BROWSER_CHROMEOS_DBUS_UPDATE_ENGINE_CLIENT_H_
+#define CHROME_BROWSER_CHROMEOS_DBUS_UPDATE_ENGINE_CLIENT_H_
+
+#include "base/callback.h"
+#include "base/observer_list.h"
+
+#include <string>
+
+namespace dbus {
+class Bus;
+}  // namespace
+
+namespace chromeos {
+
+// UpdateEngineClient is used to communicate with the update engine.
+class UpdateEngineClient {
+ public:
+  // Edges for state machine
+  //    IDLE->CHECKING_FOR_UPDATE
+  //    CHECKING_FOR_UPDATE->IDLE
+  //    CHECKING_FOR_UPDATE->UPDATE_AVAILABLE
+  //    ...
+  //    FINALIZING->UPDATE_NEED_REBOOT
+  // Any state can transition to REPORTING_ERROR_EVENT and then on to IDLE.
+  enum UpdateStatusOperation {
+    UPDATE_STATUS_ERROR = -1,
+    UPDATE_STATUS_IDLE = 0,
+    UPDATE_STATUS_CHECKING_FOR_UPDATE,
+    UPDATE_STATUS_UPDATE_AVAILABLE,
+    UPDATE_STATUS_DOWNLOADING,
+    UPDATE_STATUS_VERIFYING,
+    UPDATE_STATUS_FINALIZING,
+    UPDATE_STATUS_UPDATED_NEED_REBOOT,
+    UPDATE_STATUS_REPORTING_ERROR_EVENT
+  };
+
+  // The status of the ongoing update attempt.
+  struct Status {
+    Status() : status(UPDATE_STATUS_IDLE),
+               download_progress(0.0),
+               last_checked_time(0),
+               new_size(0) {
+    }
+
+    UpdateStatusOperation status;
+    double download_progress;   // 0.0 - 1.0
+    int64_t last_checked_time;  // As reported by std::time().
+    std::string new_version;
+    int64_t new_size;           // Valid during DOWNLOADING, in bytes.
+  };
+
+  // The result code used for RequestUpdateCheck().
+  enum UpdateCheckResult {
+    UPDATE_RESULT_SUCCESS,
+    UPDATE_RESULT_FAILED,
+  };
+
+  // Interface for observing changes from the update engine.
+  class Observer {
+   public:
+    // Called when the status is updated.
+    virtual void UpdateStatusChanged(const Status& status) {}
+  };
+
+  virtual ~UpdateEngineClient();
+
+  // Adds and removes the observer.
+  virtual void AddObserver(Observer* observer) = 0;
+  virtual void RemoveObserver(Observer* observer) = 0;
+  // Returns true if this object has the given observer.
+  virtual bool HasObserver(Observer* observer) = 0;
+
+  // Called once RequestUpdateCheck() is complete. Takes one parameter:
+  // - UpdateCheckResult: the result of the update check.
+  typedef base::Callback<void(UpdateCheckResult)> UpdateCheckCallback;
+
+  // Requests an update check and calls |callback| when completed.
+  virtual void RequestUpdateCheck(UpdateCheckCallback callback) = 0;
+
+  // Reboots if update has been performed.
+  virtual void RebootAfterUpdate() = 0;
+
+  // Requests to set the release track (channel). |track| should look like
+  // "beta-channel" or "dev-channel".
+  virtual void SetReleaseTrack(const std::string& track) = 0;
+
+  // Called once GetReleaseTrack() is complete. Takes one parameter;
+  // - string: the release track name like "beta-channel".
+  typedef base::Callback<void(const std::string&)> GetReleaseTrackCallback;
+
+  // Requests to get the release track and calls |callback| with the
+  // release track (channel). On error, calls |callback| with an empty
+  // string.
+  virtual void GetReleaseTrack(GetReleaseTrackCallback callback) = 0;
+
+  // Returns the last status the object received from the update engine.
+  //
+  // Ideally, the D-Bus client should be state-less, but there are clients
+  // that need this information.
+  virtual Status GetLastStatus() = 0;
+
+  // Returns an empty UpdateCheckCallback that does nothing.
+  static UpdateCheckCallback EmptyUpdateCheckCallback();
+
+  // Creates the instance.
+  static UpdateEngineClient* Create(dbus::Bus* bus);
+
+ protected:
+  // Create() should be used instead.
+  UpdateEngineClient();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(UpdateEngineClient);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_DBUS_UPDATE_ENGINE_CLIENT_H_
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index a2be100..481689d 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -450,6 +450,8 @@
         'browser/chromeos/dbus/session_manager_client.h',
         'browser/chromeos/dbus/speech_synthesizer_client.cc',
         'browser/chromeos/dbus/speech_synthesizer_client.h',
+        'browser/chromeos/dbus/update_engine_client.cc',
+        'browser/chromeos/dbus/update_engine_client.h',
         'browser/chromeos/disks/disk_mount_manager.cc',
         'browser/chromeos/disks/disk_mount_manager.h',
         'browser/chromeos/drop_shadow_label.cc',
diff --git a/chrome/chrome_tests.gypi b/chrome/chrome_tests.gypi
index a9b1b8fb..004d649 100644
--- a/chrome/chrome_tests.gypi
+++ b/chrome/chrome_tests.gypi
@@ -110,6 +110,8 @@
         'browser/chromeos/dbus/mock_session_manager_client.h',
         'browser/chromeos/dbus/mock_speech_synthesizer_client.cc',
         'browser/chromeos/dbus/mock_speech_synthesizer_client.h',
+        'browser/chromeos/dbus/mock_update_engine_client.cc',
+        'browser/chromeos/dbus/mock_update_engine_client.h',
         'browser/chromeos/login/mock_signed_settings_helper.cc',
         'browser/chromeos/login/mock_signed_settings_helper.h',
         # The only thing used from browser is Browser::Type.