Sync: Add DeviceInfo's ChangeProcessor

chrome/browser/sync/glue/synced_device_tracker.cc

+// Copyright (c) 2012 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/sync/glue/synced_device_tracker.h"
+
+#include "base/stringprintf.h"
+#include "base/utf_string_conversions.h"
+#include "chrome/browser/sync/glue/device_info.h"
+#include "sync/internal_api/public/base/model_type.h"
+#include "sync/internal_api/public/read_node.h"
+#include "sync/internal_api/public/read_transaction.h"
+#include "sync/internal_api/public/user_share.h"
+#include "sync/internal_api/public/write_node.h"
+#include "sync/internal_api/public/write_transaction.h"
+
+namespace browser_sync {
+
+namespace {
+
+// Return the DeviceInfo UNIQUE_CLIENT_TAG value for the given sync cache_guid.
+std::string DeviceInfoLookupString(const std::string& cache_guid) {
+  return base::StringPrintf("DeviceInfo_%s", cache_guid.c_str());
+}
+
+}  // namespace
+
+SyncedDeviceTracker::SyncedDeviceTracker(syncer::UserShare* user_share,
+                                         const std::string& cache_guid)
+  : ChangeProcessor(NULL),
+    ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)),
+    user_share_(user_share),
+    cache_guid_(cache_guid),
+    local_device_info_tag_(DeviceInfoLookupString(cache_guid)) {
+}
+
+SyncedDeviceTracker::~SyncedDeviceTracker() {
+}
+
+void SyncedDeviceTracker::StartImpl(Profile* profile) { }
+
+void SyncedDeviceTracker::ApplyChangesFromSyncModel(
+      const syncer::BaseTransaction* trans,
+      int64 model_version,
+      const syncer::ImmutableChangeRecordList& changes) {
+  // If desired, we could maintain a cache of device info.  This method will be
+  // called with a transaction every time the device info is modified, so this
+  // would be the right place to update the cache.
+}
+
+void SyncedDeviceTracker::CommitChangesFromSyncModel() {
+  // TODO(sync): notify our listeners.
+}
+
+scoped_ptr<DeviceInfo> SyncedDeviceTracker::ReadLocalDeviceInfo() {
+  syncer::ReadTransaction trans(FROM_HERE, user_share_);
+  return ReadLocalDeviceInfo(trans);
+}
+
+scoped_ptr<DeviceInfo> SyncedDeviceTracker::ReadLocalDeviceInfo(
+    const syncer::BaseTransaction& trans) {
+  syncer::ReadNode node(&trans);
+  if (node.InitByClientTagLookup(syncer::DEVICE_INFO, local_device_info_tag_) !=
+      syncer::BaseNode::INIT_OK) {
+    return scoped_ptr<DeviceInfo>();
+  }
+
+  const sync_pb::DeviceInfoSpecifics& specifics = node.GetDeviceInfoSpecifics();
+  return scoped_ptr<DeviceInfo> (
+      new DeviceInfo(specifics.client_name(),
+                     specifics.chrome_version(),
+                     specifics.sync_user_agent(),
+                     specifics.device_type()));
+}
+
+void SyncedDeviceTracker::InitLocalDeviceInfo(const base::Closure& callback) {
+  DeviceInfo::CreateLocalDeviceInfo(
+      base::Bind(&SyncedDeviceTracker::InitLocalDeviceInfoContinuation,
+                 weak_factory_.GetWeakPtr(), callback));
+}
+
+void SyncedDeviceTracker::InitLocalDeviceInfoContinuation(
+    const base::Closure& callback, const DeviceInfo& local_info) {
+  WriteLocalDeviceInfo(local_info);
+  callback.Run();
+}
+
+void SyncedDeviceTracker::WriteLocalDeviceInfo(const DeviceInfo& info) {
+  sync_pb::DeviceInfoSpecifics specifics;
+  specifics.set_cache_guid(cache_guid_);
+  specifics.set_client_name(info.client_name());
+  specifics.set_chrome_version(info.chrome_version());
+  specifics.set_sync_user_agent(info.sync_user_agent());
+  specifics.set_device_type(info.device_type());
+
+  syncer::WriteTransaction trans(FROM_HERE, user_share_);
+  syncer::WriteNode node(&trans);
+
+  if (node.InitByClientTagLookup(syncer::DEVICE_INFO, local_device_info_tag_) ==
+      syncer::BaseNode::INIT_OK) {
+    node.SetDeviceInfoSpecifics(specifics);
+    node.SetTitle(ASCIIToWide(specifics.client_name()));
+  } else {
+    syncer::ReadNode type_root(&trans);
+    syncer::BaseNode::InitByLookupResult type_root_lookup_result =
+        type_root.InitByTagLookup(ModelTypeToRootTag(syncer::DEVICE_INFO));
+    DCHECK_EQ(syncer::BaseNode::INIT_OK, type_root_lookup_result);
+
+    syncer::WriteNode new_node(&trans);
+    syncer::WriteNode::InitUniqueByCreationResult create_result =
+        new_node.InitUniqueByCreation(syncer::DEVICE_INFO,
+                                      type_root,
+                                      local_device_info_tag_);
+    DCHECK_EQ(syncer::WriteNode::INIT_SUCCESS, create_result);
+    new_node.SetDeviceInfoSpecifics(specifics);
+    new_node.SetTitle(ASCIIToWide(specifics.client_name()));
+  }
+}
+
+}  // namespace browser_sync