chrome/browser/media_galleries/fileapi/picasa_data_provider.cc

   1 // Copyright 2013 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/media_galleries/fileapi/picasa_data_provider.h"
   6
   7 #include <utility>
   8
   9 #include "base/basictypes.h"
  10 #include "base/bind_helpers.h"
  11 #include "base/callback.h"
  12 #include "base/file_util.h"
  13 #include "base/strings/stringprintf.h"
  14 #include "chrome/browser/media_galleries/fileapi/file_path_watcher_util.h"
  15 #include "chrome/browser/media_galleries/fileapi/media_file_system_backend.h"
  16 #include "chrome/browser/media_galleries/fileapi/safe_picasa_album_table_reader.h"
  17 #include "chrome/browser/media_galleries/fileapi/safe_picasa_albums_indexer.h"
  18 #include "chrome/browser/media_galleries/imported_media_gallery_registry.h"
  19 #include "webkit/browser/fileapi/file_system_operation_context.h"
  20 #include "webkit/browser/fileapi/file_system_url.h"
  21
  22 namespace picasa {
  23
  24 namespace {
  25
  26 void RunAllCallbacks(
  27     std::vector<PicasaDataProvider::ReadyCallback>* ready_callbacks,
  28     bool success) {
  29   for (std::vector<PicasaDataProvider::ReadyCallback>::const_iterator it =
  30            ready_callbacks->begin();
  31        it != ready_callbacks->end();
  32        ++it) {
  33     it->Run(success);
  34   }
  35   ready_callbacks->clear();
  36 }
  37
  38 }  // namespace
  39
  40 PicasaDataProvider::PicasaDataProvider(const base::FilePath& database_path)
  41     : database_path_(database_path),
  42       state_(STALE_DATA_STATE),
  43       weak_factory_(this) {
  44   DCHECK(MediaFileSystemBackend::CurrentlyOnMediaTaskRunnerThread());
  45
  46   StartFilePathWatchOnMediaTaskRunner(
  47       database_path_.DirName().AppendASCII(kPicasaTempDirName),
  48       base::Bind(&PicasaDataProvider::OnTempDirWatchStarted,
  49                  weak_factory_.GetWeakPtr()),
  50       base::Bind(&PicasaDataProvider::OnTempDirChanged,
  51                  weak_factory_.GetWeakPtr()));
  52 }
  53
  54 PicasaDataProvider::~PicasaDataProvider() {}
  55
  56 void PicasaDataProvider::RefreshData(DataType needed_data,
  57                                      const ReadyCallback& ready_callback) {
  58   DCHECK(MediaFileSystemBackend::CurrentlyOnMediaTaskRunnerThread());
  59   // TODO(tommycli): Need to watch the database_path_ folder and handle
  60   // rereading the data when it changes.
  61
  62   if (state_ == INVALID_DATA_STATE) {
  63     ready_callback.Run(false /* success */);
  64     return;
  65   }
  66
  67   if (needed_data == LIST_OF_ALBUMS_AND_FOLDERS_DATA) {
  68     if (state_ == LIST_OF_ALBUMS_AND_FOLDERS_FRESH_STATE ||
  69         state_ == ALBUMS_IMAGES_FRESH_STATE) {
  70       ready_callback.Run(true /* success */);
  71       return;
  72     }
  73     album_list_ready_callbacks_.push_back(ready_callback);
  74   } else {
  75     if (state_ == ALBUMS_IMAGES_FRESH_STATE) {
  76       ready_callback.Run(true /* success */);
  77       return;
  78     }
  79     albums_index_ready_callbacks_.push_back(ready_callback);
  80   }
  81   DoRefreshIfNecessary();
  82 }
  83
  84 scoped_ptr<AlbumMap> PicasaDataProvider::GetFolders() {
  85   DCHECK(MediaFileSystemBackend::CurrentlyOnMediaTaskRunnerThread());
  86   DCHECK(state_ == LIST_OF_ALBUMS_AND_FOLDERS_FRESH_STATE ||
  87          state_ == ALBUMS_IMAGES_FRESH_STATE);
  88   return make_scoped_ptr(new AlbumMap(folder_map_));
  89 }
  90
  91 scoped_ptr<AlbumMap> PicasaDataProvider::GetAlbums() {
  92   DCHECK(MediaFileSystemBackend::CurrentlyOnMediaTaskRunnerThread());
  93   DCHECK(state_ == LIST_OF_ALBUMS_AND_FOLDERS_FRESH_STATE ||
  94          state_ == ALBUMS_IMAGES_FRESH_STATE);
  95   return make_scoped_ptr(new AlbumMap(album_map_));
  96 }
  97
  98 scoped_ptr<AlbumImages> PicasaDataProvider::FindAlbumImages(
  99     const std::string& key,
 100     base::PlatformFileError* error) {
 101   DCHECK(MediaFileSystemBackend::CurrentlyOnMediaTaskRunnerThread());
 102   DCHECK(state_ == ALBUMS_IMAGES_FRESH_STATE);
 103   DCHECK(error);
 104
 105   AlbumImagesMap::const_iterator it = albums_images_.find(key);
 106
 107   if (it == albums_images_.end()) {
 108     *error = base::PLATFORM_FILE_ERROR_NOT_FOUND;
 109     return scoped_ptr<AlbumImages>();
 110   }
 111
 112   *error = base::PLATFORM_FILE_OK;
 113   return make_scoped_ptr(new AlbumImages(it->second));
 114 }
 115
 116 void PicasaDataProvider::InvalidateData() {
 117   DCHECK(MediaFileSystemBackend::CurrentlyOnMediaTaskRunnerThread());
 118
 119   // Set data state to stale and ignore responses from any in-flight processes.
 120   // TODO(tommycli): Implement and call Cancel function for these
 121   // UtilityProcessHostClients to actually kill the in-flight processes.
 122   state_ = STALE_DATA_STATE;
 123   album_table_reader_ = NULL;
 124   albums_indexer_ = NULL;
 125
 126   DoRefreshIfNecessary();
 127 }
 128
 129 void PicasaDataProvider::OnTempDirWatchStarted(
 130     scoped_ptr<base::FilePathWatcher> temp_dir_watcher) {
 131   DCHECK(MediaFileSystemBackend::CurrentlyOnMediaTaskRunnerThread());
 132   temp_dir_watcher_.reset(temp_dir_watcher.release());
 133 }
 134
 135 void PicasaDataProvider::OnTempDirChanged(const base::FilePath& temp_dir_path,
 136                                           bool error) {
 137   DCHECK(MediaFileSystemBackend::CurrentlyOnMediaTaskRunnerThread());
 138   if (base::IsDirectoryEmpty(temp_dir_path))
 139     InvalidateData();
 140 }
 141
 142 void PicasaDataProvider::DoRefreshIfNecessary() {
 143   DCHECK(state_ != INVALID_DATA_STATE);
 144   DCHECK(state_ != ALBUMS_IMAGES_FRESH_STATE);
 145   DCHECK(!(album_table_reader_ && albums_indexer_));
 146
 147   if (album_list_ready_callbacks_.empty() &&
 148       albums_index_ready_callbacks_.empty()) {
 149     return;
 150   }
 151
 152   if (state_ == STALE_DATA_STATE) {
 153     if (album_table_reader_)
 154       return;
 155     album_table_reader_ =
 156         new SafePicasaAlbumTableReader(AlbumTableFiles(database_path_));
 157     album_table_reader_->Start(
 158         base::Bind(&PicasaDataProvider::OnAlbumTableReaderDone,
 159                    weak_factory_.GetWeakPtr(),
 160                    album_table_reader_));
 161   } else {
 162     DCHECK(state_ == LIST_OF_ALBUMS_AND_FOLDERS_FRESH_STATE);
 163     if (albums_indexer_)
 164       return;
 165     albums_indexer_ = new SafePicasaAlbumsIndexer(album_map_, folder_map_);
 166     albums_indexer_->Start(base::Bind(&PicasaDataProvider::OnAlbumsIndexerDone,
 167                                       weak_factory_.GetWeakPtr(),
 168                                       albums_indexer_));
 169   }
 170 }
 171
 172 void PicasaDataProvider::OnAlbumTableReaderDone(
 173     scoped_refptr<SafePicasaAlbumTableReader> reader,
 174     bool parse_success,
 175     const std::vector<AlbumInfo>& albums,
 176     const std::vector<AlbumInfo>& folders) {
 177   DCHECK(MediaFileSystemBackend::CurrentlyOnMediaTaskRunnerThread());
 178   // If the reader has already been deemed stale, ignore the result.
 179   if (reader != album_table_reader_)
 180     return;
 181   album_table_reader_ = NULL;
 182
 183   DCHECK(state_ == STALE_DATA_STATE);
 184
 185   if (!parse_success) {
 186     // If we didn't get the list successfully, fail all those waiting for
 187     // the albums indexer also.
 188     state_ = INVALID_DATA_STATE;
 189     RunAllCallbacks(&album_list_ready_callbacks_, false /* success */);
 190     RunAllCallbacks(&albums_index_ready_callbacks_, false /* success */);
 191     return;
 192   }
 193
 194   album_map_.clear();
 195   folder_map_.clear();
 196   UniquifyNames(albums, &album_map_);
 197   UniquifyNames(folders, &folder_map_);
 198
 199   state_ = LIST_OF_ALBUMS_AND_FOLDERS_FRESH_STATE;
 200   RunAllCallbacks(&album_list_ready_callbacks_, parse_success);
 201
 202   // Chain from this process onto refreshing the albums images if necessary.
 203   DoRefreshIfNecessary();
 204 }
 205
 206 void PicasaDataProvider::OnAlbumsIndexerDone(
 207     scoped_refptr<SafePicasaAlbumsIndexer> indexer,
 208     bool success,
 209     const picasa::AlbumImagesMap& albums_images) {
 210   DCHECK(MediaFileSystemBackend::CurrentlyOnMediaTaskRunnerThread());
 211   // If the indexer has already been deemed stale, ignore the result.
 212   if (indexer != albums_indexer_)
 213     return;
 214   albums_indexer_ = NULL;
 215
 216   DCHECK(state_ == LIST_OF_ALBUMS_AND_FOLDERS_FRESH_STATE);
 217
 218   if (success) {
 219     state_ = ALBUMS_IMAGES_FRESH_STATE;
 220
 221     albums_images_ = albums_images;
 222   }
 223
 224   RunAllCallbacks(&albums_index_ready_callbacks_, success);
 225 }
 226
 227 // static
 228 std::string PicasaDataProvider::DateToPathString(const base::Time& time) {
 229   base::Time::Exploded exploded_time;
 230   time.LocalExplode(&exploded_time);
 231
 232   // TODO(tommycli): Investigate better localization and persisting which locale
 233   // we use to generate these unique names.
 234   return base::StringPrintf("%04d-%02d-%02d", exploded_time.year,
 235                             exploded_time.month, exploded_time.day_of_month);
 236 }
 237
 238 // static
 239 void PicasaDataProvider::UniquifyNames(const std::vector<AlbumInfo>& info_list,
 240                                        AlbumMap* result_map) {
 241   // TODO(tommycli): We should persist the uniquified names.
 242   std::vector<std::string> desired_names;
 243
 244   std::map<std::string, int> total_counts;
 245   std::map<std::string, int> current_counts;
 246
 247   for (std::vector<AlbumInfo>::const_iterator it = info_list.begin();
 248        it != info_list.end(); ++it) {
 249     std::string desired_name =
 250         it->name + " " + DateToPathString(it->timestamp);
 251     desired_names.push_back(desired_name);
 252     ++total_counts[desired_name];
 253   }
 254
 255   for (unsigned int i = 0; i < info_list.size(); i++) {
 256     std::string name = desired_names[i];
 257
 258     if (total_counts[name] != 1) {
 259       name = base::StringPrintf("%s (%d)", name.c_str(),
 260                                 ++current_counts[name]);
 261     }
 262
 263     result_map->insert(std::pair<std::string, AlbumInfo>(name, info_list[i]));
 264   }
 265 }
 266
 267 }  // namespace picasa