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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     weak_factory_(this),
     32     user_share_(user_share),
     33     cache_guid_(cache_guid),
     34     local_device_info_tag_(DeviceInfoLookupString(cache_guid)) {
     35 }
     36 
     37 SyncedDeviceTracker::~SyncedDeviceTracker() {
     38 }
     39 
     40 void SyncedDeviceTracker::StartImpl(Profile* profile) { }
     41 
     42 void SyncedDeviceTracker::ApplyChangesFromSyncModel(
     43       const syncer::BaseTransaction* trans,
     44       int64 model_version,
     45       const syncer::ImmutableChangeRecordList& changes) {
     46   // If desired, we could maintain a cache of device info.  This method will be
     47   // called with a transaction every time the device info is modified, so this
     48   // would be the right place to update the cache.
     49 }
     50 
     51 void SyncedDeviceTracker::CommitChangesFromSyncModel() {
     52   // TODO(sync): notify our listeners.
     53 }
     54 
     55 scoped_ptr<DeviceInfo> SyncedDeviceTracker::ReadLocalDeviceInfo() const {
     56   syncer::ReadTransaction trans(FROM_HERE, user_share_);
     57   return ReadLocalDeviceInfo(trans);
     58 }
     59 
     60 scoped_ptr<DeviceInfo> SyncedDeviceTracker::ReadLocalDeviceInfo(
     61     const syncer::BaseTransaction& trans) const {
     62   syncer::ReadNode node(&trans);
     63   if (node.InitByClientTagLookup(syncer::DEVICE_INFO, local_device_info_tag_) !=
     64       syncer::BaseNode::INIT_OK) {
     65     return scoped_ptr<DeviceInfo>();
     66   }
     67 
     68   const sync_pb::DeviceInfoSpecifics& specifics = node.GetDeviceInfoSpecifics();
     69   return scoped_ptr<DeviceInfo> (
     70       new DeviceInfo(specifics.cache_guid(),
     71                      specifics.client_name(),
     72                      specifics.chrome_version(),
     73                      specifics.sync_user_agent(),
     74                      specifics.device_type()));
     75 }
     76 
     77 scoped_ptr<DeviceInfo> SyncedDeviceTracker::ReadDeviceInfo(
     78     const std::string& client_id) const {
     79   syncer::ReadTransaction trans(FROM_HERE, user_share_);
     80   syncer::ReadNode node(&trans);
     81   std::string lookup_string = DeviceInfoLookupString(client_id);
     82   if (node.InitByClientTagLookup(syncer::DEVICE_INFO, lookup_string) !=
     83       syncer::BaseNode::INIT_OK) {
     84     return scoped_ptr<DeviceInfo>();
     85   }
     86 
     87   const sync_pb::DeviceInfoSpecifics& specifics = node.GetDeviceInfoSpecifics();
     88   return scoped_ptr<DeviceInfo> (
     89       new DeviceInfo(specifics.cache_guid(),
     90                      specifics.client_name(),
     91                      specifics.chrome_version(),
     92                      specifics.sync_user_agent(),
     93                      specifics.device_type()));
     94 }
     95 
     96 void SyncedDeviceTracker::GetAllSyncedDeviceInfo(
     97     ScopedVector<DeviceInfo>* device_info) const {
     98   if (device_info == NULL)
     99     return;
    100 
    101   device_info->clear();
    102 
    103   syncer::ReadTransaction trans(FROM_HERE, user_share_);
    104   syncer::ReadNode root_node(&trans);
    105 
    106   if (root_node.InitByTagLookup(
    107           syncer::ModelTypeToRootTag(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 
    135 void SyncedDeviceTracker::InitLocalDeviceInfo(const base::Closure& callback) {
    136   DeviceInfo::CreateLocalDeviceInfo(
    137       cache_guid_,
    138       base::Bind(&SyncedDeviceTracker::InitLocalDeviceInfoContinuation,
    139                  weak_factory_.GetWeakPtr(), callback));
    140 }
    141 
    142 void SyncedDeviceTracker::InitLocalDeviceInfoContinuation(
    143     const base::Closure& callback, const DeviceInfo& local_info) {
    144   WriteLocalDeviceInfo(local_info);
    145   callback.Run();
    146 }
    147 
    148 void SyncedDeviceTracker::WriteLocalDeviceInfo(const DeviceInfo& info) {
    149   sync_pb::DeviceInfoSpecifics specifics;
    150   DCHECK_EQ(cache_guid_, info.guid());
    151   specifics.set_cache_guid(cache_guid_);
    152   specifics.set_client_name(info.client_name());
    153   specifics.set_chrome_version(info.chrome_version());
    154   specifics.set_sync_user_agent(info.sync_user_agent());
    155   specifics.set_device_type(info.device_type());
    156 
    157   WriteDeviceInfo(specifics, local_device_info_tag_);
    158 }
    159 
    160 void SyncedDeviceTracker::WriteDeviceInfo(
    161     const sync_pb::DeviceInfoSpecifics& specifics,
    162     const std::string& tag) {
    163   syncer::WriteTransaction trans(FROM_HERE, user_share_);
    164   syncer::WriteNode node(&trans);
    165 
    166   if (node.InitByClientTagLookup(syncer::DEVICE_INFO, tag) ==
    167       syncer::BaseNode::INIT_OK) {
    168     node.SetDeviceInfoSpecifics(specifics);
    169     node.SetTitle(UTF8ToWide(specifics.client_name()));
    170   } else {
    171     syncer::ReadNode type_root(&trans);
    172     syncer::BaseNode::InitByLookupResult type_root_lookup_result =
    173         type_root.InitByTagLookup(ModelTypeToRootTag(syncer::DEVICE_INFO));
    174     DCHECK_EQ(syncer::BaseNode::INIT_OK, type_root_lookup_result);
    175 
    176     syncer::WriteNode new_node(&trans);
    177     syncer::WriteNode::InitUniqueByCreationResult create_result =
    178         new_node.InitUniqueByCreation(syncer::DEVICE_INFO,
    179                                       type_root,
    180                                       tag);
    181     DCHECK_EQ(syncer::WriteNode::INIT_SUCCESS, create_result);
    182     new_node.SetDeviceInfoSpecifics(specifics);
    183     new_node.SetTitle(UTF8ToWide(specifics.client_name()));
    184   }
    185 }
    186 
    187 }  // namespace browser_sync
    188