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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "chrome/browser/sync/glue/synced_device_tracker.h"
      6 
      7 #include "base/strings/stringprintf.h"
      8 #include "base/strings/utf_string_conversions.h"
      9 #include "chrome/browser/sync/glue/device_info.h"
     10 #include "sync/internal_api/public/base/model_type.h"
     11 #include "sync/internal_api/public/read_node.h"
     12 #include "sync/internal_api/public/read_transaction.h"
     13 #include "sync/internal_api/public/user_share.h"
     14 #include "sync/internal_api/public/write_node.h"
     15 #include "sync/internal_api/public/write_transaction.h"
     16 
     17 namespace browser_sync {
     18 
     19 namespace {
     20 
     21 // Return the DeviceInfo UNIQUE_CLIENT_TAG value for the given sync cache_guid.
     22 std::string DeviceInfoLookupString(const std::string& cache_guid) {
     23   return base::StringPrintf("DeviceInfo_%s", cache_guid.c_str());
     24 }
     25 
     26 }  // namespace
     27 
     28 SyncedDeviceTracker::SyncedDeviceTracker(syncer::UserShare* user_share,
     29                                          const std::string& cache_guid)
     30   : ChangeProcessor(NULL),
     31     user_share_(user_share),
     32     cache_guid_(cache_guid),
     33     local_device_info_tag_(DeviceInfoLookupString(cache_guid)),
     34     weak_factory_(this) {
     35   observers_ = new ObserverListThreadSafe<Observer>;
     36 }
     37 
     38 SyncedDeviceTracker::~SyncedDeviceTracker() {
     39 }
     40 
     41 void SyncedDeviceTracker::StartImpl() { }
     42 
     43 void SyncedDeviceTracker::ApplyChangesFromSyncModel(
     44       const syncer::BaseTransaction* trans,
     45       int64 model_version,
     46       const syncer::ImmutableChangeRecordList& changes) {
     47   // If desired, we could maintain a cache of device info.  This method will be
     48   // called with a transaction every time the device info is modified, so this
     49   // would be the right place to update the cache.
     50 }
     51 
     52 void SyncedDeviceTracker::CommitChangesFromSyncModel() {
     53   observers_->Notify(&Observer::OnDeviceInfoChange);
     54 }
     55 
     56 scoped_ptr<DeviceInfo> SyncedDeviceTracker::ReadLocalDeviceInfo() const {
     57   syncer::ReadTransaction trans(FROM_HERE, user_share_);
     58   return ReadLocalDeviceInfo(trans);
     59 }
     60 
     61 scoped_ptr<DeviceInfo> SyncedDeviceTracker::ReadLocalDeviceInfo(
     62     const syncer::BaseTransaction& trans) const {
     63   syncer::ReadNode node(&trans);
     64   if (node.InitByClientTagLookup(syncer::DEVICE_INFO, local_device_info_tag_) !=
     65       syncer::BaseNode::INIT_OK) {
     66     return scoped_ptr<DeviceInfo>();
     67   }
     68 
     69   const sync_pb::DeviceInfoSpecifics& specifics = node.GetDeviceInfoSpecifics();
     70   return scoped_ptr<DeviceInfo> (
     71       new DeviceInfo(specifics.cache_guid(),
     72                      specifics.client_name(),
     73                      specifics.chrome_version(),
     74                      specifics.sync_user_agent(),
     75                      specifics.device_type()));
     76 }
     77 
     78 scoped_ptr<DeviceInfo> SyncedDeviceTracker::ReadDeviceInfo(
     79     const std::string& client_id) const {
     80   syncer::ReadTransaction trans(FROM_HERE, user_share_);
     81   syncer::ReadNode node(&trans);
     82   std::string lookup_string = DeviceInfoLookupString(client_id);
     83   if (node.InitByClientTagLookup(syncer::DEVICE_INFO, lookup_string) !=
     84       syncer::BaseNode::INIT_OK) {
     85     return scoped_ptr<DeviceInfo>();
     86   }
     87 
     88   const sync_pb::DeviceInfoSpecifics& specifics = node.GetDeviceInfoSpecifics();
     89   return scoped_ptr<DeviceInfo> (
     90       new DeviceInfo(specifics.cache_guid(),
     91                      specifics.client_name(),
     92                      specifics.chrome_version(),
     93                      specifics.sync_user_agent(),
     94                      specifics.device_type()));
     95 }
     96 
     97 void SyncedDeviceTracker::GetAllSyncedDeviceInfo(
     98     ScopedVector<DeviceInfo>* device_info) const {
     99   if (device_info == NULL)
    100     return;
    101 
    102   device_info->clear();
    103 
    104   syncer::ReadTransaction trans(FROM_HERE, user_share_);
    105   syncer::ReadNode root_node(&trans);
    106 
    107   if (root_node.InitTypeRoot(syncer::DEVICE_INFO) !=
    108       syncer::BaseNode::INIT_OK) {
    109     return;
    110   }
    111 
    112   // Get all the children of the root node and use the child id to read
    113   // device info for devices.
    114   std::vector<int64> children;
    115   root_node.GetChildIds(&children);
    116 
    117   for (std::vector<int64>::const_iterator it = children.begin();
    118        it != children.end(); ++it) {
    119     syncer::ReadNode node(&trans);
    120     if (node.InitByIdLookup(*it) != syncer::BaseNode::INIT_OK)
    121       return;
    122 
    123     const sync_pb::DeviceInfoSpecifics& specifics =
    124         node.GetDeviceInfoSpecifics();
    125     device_info->push_back(
    126         new DeviceInfo(specifics.cache_guid(),
    127                        specifics.client_name(),
    128                        specifics.chrome_version(),
    129                        specifics.sync_user_agent(),
    130                        specifics.device_type()));
    131   }
    132 }
    133 
    134 std::string SyncedDeviceTracker::cache_guid() const {
    135   return cache_guid_;
    136 }
    137 
    138 void SyncedDeviceTracker::AddObserver(Observer* observer) {
    139   observers_->AddObserver(observer);
    140 }
    141 
    142 void SyncedDeviceTracker::RemoveObserver(Observer* observer) {
    143   observers_->RemoveObserver(observer);
    144 }
    145 
    146 void SyncedDeviceTracker::InitLocalDeviceInfo(const base::Closure& callback) {
    147   DeviceInfo::CreateLocalDeviceInfo(
    148       cache_guid_,
    149       base::Bind(&SyncedDeviceTracker::InitLocalDeviceInfoContinuation,
    150                  weak_factory_.GetWeakPtr(), callback));
    151 }
    152 
    153 void SyncedDeviceTracker::InitLocalDeviceInfoContinuation(
    154     const base::Closure& callback, const DeviceInfo& local_info) {
    155   WriteLocalDeviceInfo(local_info);
    156   callback.Run();
    157 }
    158 
    159 void SyncedDeviceTracker::WriteLocalDeviceInfo(const DeviceInfo& info) {
    160   sync_pb::DeviceInfoSpecifics specifics;
    161   DCHECK_EQ(cache_guid_, info.guid());
    162   specifics.set_cache_guid(cache_guid_);
    163   specifics.set_client_name(info.client_name());
    164   specifics.set_chrome_version(info.chrome_version());
    165   specifics.set_sync_user_agent(info.sync_user_agent());
    166   specifics.set_device_type(info.device_type());
    167 
    168   WriteDeviceInfo(specifics, local_device_info_tag_);
    169 }
    170 
    171 void SyncedDeviceTracker::WriteDeviceInfo(
    172     const sync_pb::DeviceInfoSpecifics& specifics,
    173     const std::string& tag) {
    174   syncer::WriteTransaction trans(FROM_HERE, user_share_);
    175   syncer::WriteNode node(&trans);
    176 
    177   if (node.InitByClientTagLookup(syncer::DEVICE_INFO, tag) ==
    178       syncer::BaseNode::INIT_OK) {
    179     node.SetDeviceInfoSpecifics(specifics);
    180     node.SetTitle(specifics.client_name());
    181   } else {
    182     syncer::ReadNode type_root(&trans);
    183     syncer::BaseNode::InitByLookupResult type_root_lookup_result =
    184         type_root.InitTypeRoot(syncer::DEVICE_INFO);
    185     DCHECK_EQ(syncer::BaseNode::INIT_OK, type_root_lookup_result);
    186 
    187     syncer::WriteNode new_node(&trans);
    188     syncer::WriteNode::InitUniqueByCreationResult create_result =
    189         new_node.InitUniqueByCreation(syncer::DEVICE_INFO,
    190                                       type_root,
    191                                       tag);
    192     DCHECK_EQ(syncer::WriteNode::INIT_SUCCESS, create_result);
    193     new_node.SetDeviceInfoSpecifics(specifics);
    194     new_node.SetTitle(specifics.client_name());
    195   }
    196 }
    197 
    198 }  // namespace browser_sync
    199