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      1 // Copyright (c) 2010 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 
      6 #include "chrome/browser/sync/engine/verify_updates_command.h"
      7 
      8 #include "chrome/browser/sync/engine/syncer.h"
      9 #include "chrome/browser/sync/engine/syncer_proto_util.h"
     10 #include "chrome/browser/sync/engine/syncer_types.h"
     11 #include "chrome/browser/sync/engine/syncer_util.h"
     12 #include "chrome/browser/sync/engine/syncproto.h"
     13 #include "chrome/browser/sync/protocol/bookmark_specifics.pb.h"
     14 #include "chrome/browser/sync/syncable/directory_manager.h"
     15 #include "chrome/browser/sync/syncable/syncable.h"
     16 
     17 namespace browser_sync {
     18 
     19 using syncable::ScopedDirLookup;
     20 using syncable::SyncName;
     21 using syncable::WriteTransaction;
     22 
     23 using syncable::GET_BY_ID;
     24 using syncable::SYNCER;
     25 
     26 VerifyUpdatesCommand::VerifyUpdatesCommand() {}
     27 VerifyUpdatesCommand::~VerifyUpdatesCommand() {}
     28 
     29 void VerifyUpdatesCommand::ModelChangingExecuteImpl(
     30     sessions::SyncSession* session) {
     31   VLOG(1) << "Beginning Update Verification";
     32   ScopedDirLookup dir(session->context()->directory_manager(),
     33                       session->context()->account_name());
     34   if (!dir.good()) {
     35     LOG(ERROR) << "Scoped dir lookup failed!";
     36     return;
     37   }
     38   WriteTransaction trans(dir, SYNCER, __FILE__, __LINE__);
     39   sessions::StatusController* status = session->status_controller();
     40   const GetUpdatesResponse& updates = status->updates_response().get_updates();
     41   int update_count = updates.entries().size();
     42 
     43   VLOG(1) << update_count << " entries to verify";
     44   for (int i = 0; i < update_count; i++) {
     45     const SyncEntity& update =
     46         *reinterpret_cast<const SyncEntity *>(&(updates.entries(i)));
     47     ModelSafeGroup g = GetGroupForModelType(update.GetModelType(),
     48                                             session->routing_info());
     49     if (g != status->group_restriction())
     50       continue;
     51 
     52     VerifyUpdateResult result = VerifyUpdate(&trans, update,
     53                                              session->routing_info());
     54     status->mutable_update_progress()->AddVerifyResult(result.value, update);
     55     status->increment_num_updates_downloaded_by(1);
     56     if (update.deleted())
     57       status->increment_num_tombstone_updates_downloaded_by(1);
     58   }
     59 }
     60 
     61 namespace {
     62 // In the event that IDs match, but tags differ AttemptReuniteClient tag
     63 // will have refused to unify the update.
     64 // We should not attempt to apply it at all since it violates consistency
     65 // rules.
     66 VerifyResult VerifyTagConsistency(const SyncEntity& entry,
     67                                   const syncable::MutableEntry& same_id) {
     68   if (entry.has_client_defined_unique_tag() &&
     69       entry.client_defined_unique_tag() !=
     70           same_id.Get(syncable::UNIQUE_CLIENT_TAG)) {
     71     return VERIFY_FAIL;
     72   }
     73   return VERIFY_UNDECIDED;
     74 }
     75 }  // namespace
     76 
     77 VerifyUpdatesCommand::VerifyUpdateResult VerifyUpdatesCommand::VerifyUpdate(
     78     syncable::WriteTransaction* trans, const SyncEntity& entry,
     79     const ModelSafeRoutingInfo& routes) {
     80   syncable::Id id = entry.id();
     81   VerifyUpdateResult result = {VERIFY_FAIL, GROUP_PASSIVE};
     82 
     83   const bool deleted = entry.has_deleted() && entry.deleted();
     84   const bool is_directory = entry.IsFolder();
     85   const syncable::ModelType model_type = entry.GetModelType();
     86 
     87   if (!id.ServerKnows()) {
     88     LOG(ERROR) << "Illegal negative id in received updates";
     89     return result;
     90   }
     91   {
     92     const std::string name = SyncerProtoUtil::NameFromSyncEntity(entry);
     93     if (name.empty() && !deleted) {
     94       LOG(ERROR) << "Zero length name in non-deleted update";
     95       return result;
     96     }
     97   }
     98 
     99   syncable::MutableEntry same_id(trans, GET_BY_ID, id);
    100   result.value = SyncerUtil::VerifyNewEntry(entry, &same_id, deleted);
    101 
    102   syncable::ModelType placement_type = !deleted ? entry.GetModelType()
    103       : same_id.good() ? same_id.GetModelType() : syncable::UNSPECIFIED;
    104   result.placement = GetGroupForModelType(placement_type, routes);
    105 
    106   if (VERIFY_UNDECIDED == result.value) {
    107     result.value = VerifyTagConsistency(entry, same_id);
    108   }
    109 
    110   if (VERIFY_UNDECIDED == result.value) {
    111     if (deleted)
    112       result.value = VERIFY_SUCCESS;
    113   }
    114 
    115   // If we have an existing entry, we check here for updates that break
    116   // consistency rules.
    117   if (VERIFY_UNDECIDED == result.value) {
    118     result.value = SyncerUtil::VerifyUpdateConsistency(trans, entry, &same_id,
    119         deleted, is_directory, model_type);
    120   }
    121 
    122   if (VERIFY_UNDECIDED == result.value)
    123     result.value = VERIFY_SUCCESS;  // No news is good news.
    124 
    125   return result;  // This might be VERIFY_SUCCESS as well
    126 }
    127 
    128 }  // namespace browser_sync
    129