src/sync/engine/get_updates_processor.cc

   1 // Copyright 2014 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 "sync/engine/get_updates_processor.h"
   6
   7 #include <map>
   8
   9 #include "base/debug/trace_event.h"
  10 #include "sync/engine/get_updates_delegate.h"
  11 #include "sync/engine/syncer_proto_util.h"
  12 #include "sync/engine/update_handler.h"
  13 #include "sync/internal_api/public/events/get_updates_response_event.h"
  14 #include "sync/protocol/sync.pb.h"
  15 #include "sync/sessions/status_controller.h"
  16 #include "sync/sessions/sync_session.h"
  17 #include "sync/syncable/directory.h"
  18 #include "sync/syncable/nigori_handler.h"
  19 #include "sync/syncable/syncable_read_transaction.h"
  20
  21 typedef std::vector<const sync_pb::SyncEntity*> SyncEntityList;
  22 typedef std::map<syncer::ModelType, SyncEntityList> TypeSyncEntityMap;
  23
  24 namespace syncer {
  25
  26 typedef std::map<ModelType, size_t> TypeToIndexMap;
  27
  28 namespace {
  29
  30 bool ShouldRequestEncryptionKey(sessions::SyncSessionContext* context) {
  31   syncable::Directory* dir = context->directory();
  32   syncable::ReadTransaction trans(FROM_HERE, dir);
  33   syncable::NigoriHandler* nigori_handler = dir->GetNigoriHandler();
  34   return nigori_handler->NeedKeystoreKey(&trans);
  35 }
  36
  37
  38 SyncerError HandleGetEncryptionKeyResponse(
  39     const sync_pb::ClientToServerResponse& update_response,
  40     syncable::Directory* dir) {
  41   bool success = false;
  42   if (update_response.get_updates().encryption_keys_size() == 0) {
  43     LOG(ERROR) << "Failed to receive encryption key from server.";
  44     return SERVER_RESPONSE_VALIDATION_FAILED;
  45   }
  46   syncable::ReadTransaction trans(FROM_HERE, dir);
  47   syncable::NigoriHandler* nigori_handler = dir->GetNigoriHandler();
  48   success = nigori_handler->SetKeystoreKeys(
  49       update_response.get_updates().encryption_keys(),
  50       &trans);
  51
  52   DVLOG(1) << "GetUpdates returned "
  53            << update_response.get_updates().encryption_keys_size()
  54            << "encryption keys. Nigori keystore key "
  55            << (success ? "" : "not ") << "updated.";
  56   return (success ? SYNCER_OK : SERVER_RESPONSE_VALIDATION_FAILED);
  57 }
  58
  59 // Given a GetUpdates response, iterates over all the returned items and
  60 // divides them according to their type.  Outputs a map from model types to
  61 // received SyncEntities.  The output map will have entries (possibly empty)
  62 // for all types in |requested_types|.
  63 void PartitionUpdatesByType(const sync_pb::GetUpdatesResponse& gu_response,
  64                             ModelTypeSet requested_types,
  65                             TypeSyncEntityMap* updates_by_type) {
  66   int update_count = gu_response.entries().size();
  67   for (ModelTypeSet::Iterator it = requested_types.First();
  68        it.Good(); it.Inc()) {
  69     updates_by_type->insert(std::make_pair(it.Get(), SyncEntityList()));
  70   }
  71   for (int i = 0; i < update_count; ++i) {
  72     const sync_pb::SyncEntity& update = gu_response.entries(i);
  73     ModelType type = GetModelType(update);
  74     if (!IsRealDataType(type)) {
  75       NOTREACHED() << "Received update with invalid type.";
  76       continue;
  77     }
  78
  79     TypeSyncEntityMap::iterator it = updates_by_type->find(type);
  80     if (it == updates_by_type->end()) {
  81       NOTREACHED() << "Received update for unexpected type "
  82                    << ModelTypeToString(type);
  83       continue;
  84     }
  85
  86     it->second.push_back(&update);
  87   }
  88 }
  89
  90 // Builds a map of ModelTypes to indices to progress markers in the given
  91 // |gu_response| message.  The map is returned in the |index_map| parameter.
  92 void PartitionProgressMarkersByType(
  93     const sync_pb::GetUpdatesResponse& gu_response,
  94     ModelTypeSet request_types,
  95     TypeToIndexMap* index_map) {
  96   for (int i = 0; i < gu_response.new_progress_marker_size(); ++i) {
  97     int field_number = gu_response.new_progress_marker(i).data_type_id();
  98     ModelType model_type = GetModelTypeFromSpecificsFieldNumber(field_number);
  99     if (!IsRealDataType(model_type)) {
 100       DLOG(WARNING) << "Unknown field number " << field_number;
 101       continue;
 102     }
 103     if (!request_types.Has(model_type)) {
 104       DLOG(WARNING)
 105           << "Skipping unexpected progress marker for non-enabled type "
 106           << ModelTypeToString(model_type);
 107       continue;
 108     }
 109     index_map->insert(std::make_pair(model_type, i));
 110   }
 111 }
 112
 113 void PartitionContextMutationsByType(
 114     const sync_pb::GetUpdatesResponse& gu_response,
 115     ModelTypeSet request_types,
 116     TypeToIndexMap* index_map) {
 117   for (int i = 0; i < gu_response.context_mutations_size(); ++i) {
 118     int field_number = gu_response.context_mutations(i).data_type_id();
 119     ModelType model_type = GetModelTypeFromSpecificsFieldNumber(field_number);
 120     if (!IsRealDataType(model_type)) {
 121       DLOG(WARNING) << "Unknown field number " << field_number;
 122       continue;
 123     }
 124     if (!request_types.Has(model_type)) {
 125       DLOG(WARNING)
 126           << "Skipping unexpected context mutation for non-enabled type "
 127           << ModelTypeToString(model_type);
 128       continue;
 129     }
 130     index_map->insert(std::make_pair(model_type, i));
 131   }
 132 }
 133
 134 // Initializes the parts of the GetUpdatesMessage that depend on shared state,
 135 // like the ShouldRequestEncryptionKey() status.  This is kept separate from the
 136 // other of the message-building functions to make the rest of the code easier
 137 // to test.
 138 void InitDownloadUpdatesContext(
 139     sessions::SyncSession* session,
 140     bool create_mobile_bookmarks_folder,
 141     sync_pb::ClientToServerMessage* message) {
 142   message->set_share(session->context()->account_name());
 143   message->set_message_contents(sync_pb::ClientToServerMessage::GET_UPDATES);
 144
 145   sync_pb::GetUpdatesMessage* get_updates = message->mutable_get_updates();
 146
 147   // We want folders for our associated types, always.  If we were to set
 148   // this to false, the server would send just the non-container items
 149   // (e.g. Bookmark URLs but not their containing folders).
 150   get_updates->set_fetch_folders(true);
 151
 152   get_updates->set_create_mobile_bookmarks_folder(
 153       create_mobile_bookmarks_folder);
 154   bool need_encryption_key = ShouldRequestEncryptionKey(session->context());
 155   get_updates->set_need_encryption_key(need_encryption_key);
 156
 157   // Set legacy GetUpdatesMessage.GetUpdatesCallerInfo information.
 158   get_updates->mutable_caller_info()->set_notifications_enabled(
 159       session->context()->notifications_enabled());
 160 }
 161
 162 }  // namespace
 163
 164 GetUpdatesProcessor::GetUpdatesProcessor(UpdateHandlerMap* update_handler_map,
 165                                          const GetUpdatesDelegate& delegate)
 166     : update_handler_map_(update_handler_map), delegate_(delegate) {}
 167
 168 GetUpdatesProcessor::~GetUpdatesProcessor() {}
 169
 170 SyncerError GetUpdatesProcessor::DownloadUpdates(
 171     ModelTypeSet request_types,
 172     sessions::SyncSession* session,
 173     bool create_mobile_bookmarks_folder) {
 174   TRACE_EVENT0("sync", "DownloadUpdates");
 175
 176   sync_pb::ClientToServerMessage message;
 177   InitDownloadUpdatesContext(session,
 178                              create_mobile_bookmarks_folder,
 179                              &message);
 180   PrepareGetUpdates(request_types, &message);
 181
 182   SyncerError result = ExecuteDownloadUpdates(request_types, session, &message);
 183   session->mutable_status_controller()->set_last_download_updates_result(
 184       result);
 185   return result;
 186 }
 187
 188 void GetUpdatesProcessor::PrepareGetUpdates(
 189     ModelTypeSet gu_types,
 190     sync_pb::ClientToServerMessage* message) {
 191   sync_pb::GetUpdatesMessage* get_updates = message->mutable_get_updates();
 192
 193   for (ModelTypeSet::Iterator it = gu_types.First(); it.Good(); it.Inc()) {
 194     UpdateHandlerMap::iterator handler_it = update_handler_map_->find(it.Get());
 195     DCHECK(handler_it != update_handler_map_->end())
 196         << "Failed to look up handler for " << ModelTypeToString(it.Get());
 197     sync_pb::DataTypeProgressMarker* progress_marker =
 198         get_updates->add_from_progress_marker();
 199     handler_it->second->GetDownloadProgress(progress_marker);
 200     progress_marker->clear_gc_directive();
 201
 202     sync_pb::DataTypeContext context;
 203     handler_it->second->GetDataTypeContext(&context);
 204     if (!context.context().empty())
 205       get_updates->add_client_contexts()->Swap(&context);
 206   }
 207
 208   delegate_.HelpPopulateGuMessage(get_updates);
 209 }
 210
 211 SyncerError GetUpdatesProcessor::ExecuteDownloadUpdates(
 212     ModelTypeSet request_types,
 213     sessions::SyncSession* session,
 214     sync_pb::ClientToServerMessage* msg) {
 215   sync_pb::ClientToServerResponse update_response;
 216   sessions::StatusController* status = session->mutable_status_controller();
 217   bool need_encryption_key = ShouldRequestEncryptionKey(session->context());
 218
 219   if (session->context()->debug_info_getter()) {
 220     sync_pb::DebugInfo* debug_info = msg->mutable_debug_info();
 221     CopyClientDebugInfo(session->context()->debug_info_getter(), debug_info);
 222   }
 223
 224   session->SendProtocolEvent(
 225       *(delegate_.GetNetworkRequestEvent(base::Time::Now(), *msg)));
 226
 227   SyncerError result = SyncerProtoUtil::PostClientToServerMessage(
 228       msg,
 229       &update_response,
 230       session);
 231
 232   DVLOG(2) << SyncerProtoUtil::ClientToServerResponseDebugString(
 233       update_response);
 234
 235   if (result != SYNCER_OK) {
 236     GetUpdatesResponseEvent response_event(
 237         base::Time::Now(), update_response, result);
 238     session->SendProtocolEvent(response_event);
 239
 240     LOG(ERROR) << "PostClientToServerMessage() failed during GetUpdates";
 241     return result;
 242   }
 243
 244   DVLOG(1) << "GetUpdates returned "
 245            << update_response.get_updates().entries_size()
 246            << " updates.";
 247
 248
 249   if (session->context()->debug_info_getter()) {
 250     // Clear debug info now that we have successfully sent it to the server.
 251     DVLOG(1) << "Clearing client debug info.";
 252     session->context()->debug_info_getter()->ClearDebugInfo();
 253   }
 254
 255   if (need_encryption_key ||
 256       update_response.get_updates().encryption_keys_size() > 0) {
 257     syncable::Directory* dir = session->context()->directory();
 258     status->set_last_get_key_result(
 259         HandleGetEncryptionKeyResponse(update_response, dir));
 260   }
 261
 262   SyncerError process_result = ProcessResponse(update_response.get_updates(),
 263                                               request_types,
 264                                               status);
 265
 266   GetUpdatesResponseEvent response_event(
 267       base::Time::Now(), update_response, process_result);
 268   session->SendProtocolEvent(response_event);
 269
 270   DVLOG(1) << "GetUpdates result: " << process_result;
 271
 272   return process_result;
 273 }
 274
 275 SyncerError GetUpdatesProcessor::ProcessResponse(
 276     const sync_pb::GetUpdatesResponse& gu_response,
 277     ModelTypeSet request_types,
 278     sessions::StatusController* status) {
 279   status->increment_num_updates_downloaded_by(gu_response.entries_size());
 280
 281   // The changes remaining field is used to prevent the client from looping.  If
 282   // that field is being set incorrectly, we're in big trouble.
 283   if (!gu_response.has_changes_remaining()) {
 284     return SERVER_RESPONSE_VALIDATION_FAILED;
 285   }
 286
 287   syncer::SyncerError result =
 288       ProcessGetUpdatesResponse(request_types, gu_response, status);
 289   if (result != syncer::SYNCER_OK)
 290     return result;
 291
 292   if (gu_response.changes_remaining() == 0) {
 293     return SYNCER_OK;
 294   } else {
 295     return SERVER_MORE_TO_DOWNLOAD;
 296   }
 297 }
 298
 299 syncer::SyncerError GetUpdatesProcessor::ProcessGetUpdatesResponse(
 300     ModelTypeSet gu_types,
 301     const sync_pb::GetUpdatesResponse& gu_response,
 302     sessions::StatusController* status_controller) {
 303   TypeSyncEntityMap updates_by_type;
 304   PartitionUpdatesByType(gu_response, gu_types, &updates_by_type);
 305   DCHECK_EQ(gu_types.Size(), updates_by_type.size());
 306
 307   TypeToIndexMap progress_index_by_type;
 308   PartitionProgressMarkersByType(gu_response,
 309                                  gu_types,
 310                                  &progress_index_by_type);
 311   if (gu_types.Size() != progress_index_by_type.size()) {
 312     NOTREACHED() << "Missing progress markers in GetUpdates response.";
 313     return syncer::SERVER_RESPONSE_VALIDATION_FAILED;
 314   }
 315
 316   TypeToIndexMap context_by_type;
 317   PartitionContextMutationsByType(gu_response, gu_types, &context_by_type);
 318
 319   // Iterate over these maps in parallel, processing updates for each type.
 320   TypeToIndexMap::iterator progress_marker_iter =
 321       progress_index_by_type.begin();
 322   TypeSyncEntityMap::iterator updates_iter = updates_by_type.begin();
 323   for (; (progress_marker_iter != progress_index_by_type.end()
 324            && updates_iter != updates_by_type.end());
 325        ++progress_marker_iter, ++updates_iter) {
 326     DCHECK_EQ(progress_marker_iter->first, updates_iter->first);
 327     ModelType type = progress_marker_iter->first;
 328
 329     UpdateHandlerMap::iterator update_handler_iter =
 330         update_handler_map_->find(type);
 331
 332     sync_pb::DataTypeContext context;
 333     TypeToIndexMap::iterator context_iter = context_by_type.find(type);
 334     if (context_iter != context_by_type.end())
 335       context.CopyFrom(gu_response.context_mutations(context_iter->second));
 336
 337     if (update_handler_iter != update_handler_map_->end()) {
 338       syncer::SyncerError result =
 339           update_handler_iter->second->ProcessGetUpdatesResponse(
 340               gu_response.new_progress_marker(progress_marker_iter->second),
 341               context,
 342               updates_iter->second,
 343               status_controller);
 344       if (result != syncer::SYNCER_OK)
 345         return result;
 346     } else {
 347       DLOG(WARNING)
 348           << "Ignoring received updates of a type we can't handle.  "
 349           << "Type is: " << ModelTypeToString(type);
 350       continue;
 351     }
 352   }
 353   DCHECK(progress_marker_iter == progress_index_by_type.end() &&
 354          updates_iter == updates_by_type.end());
 355
 356   return syncer::SYNCER_OK;
 357 }
 358
 359 void GetUpdatesProcessor::ApplyUpdates(
 360     ModelTypeSet gu_types,
 361     sessions::StatusController* status_controller) {
 362   delegate_.ApplyUpdates(gu_types, status_controller, update_handler_map_);
 363 }
 364
 365 void GetUpdatesProcessor::CopyClientDebugInfo(
 366     sessions::DebugInfoGetter* debug_info_getter,
 367     sync_pb::DebugInfo* debug_info) {
 368   DVLOG(1) << "Copying client debug info to send.";
 369   debug_info_getter->GetDebugInfo(debug_info);
 370 }
 371
 372 }  // namespace syncer