src/sync/engine/sync_directory_commit_contribution.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 "sync/engine/sync_directory_commit_contribution.h"
   6
   7 #include "sync/engine/commit_util.h"
   8 #include "sync/engine/get_commit_ids.h"
   9 #include "sync/engine/syncer_util.h"
  10 #include "sync/syncable/model_neutral_mutable_entry.h"
  11 #include "sync/syncable/syncable_model_neutral_write_transaction.h"
  12
  13 namespace syncer {
  14
  15 using syncable::GET_BY_HANDLE;
  16 using syncable::SYNCER;
  17
  18 SyncDirectoryCommitContribution::~SyncDirectoryCommitContribution() {
  19   DCHECK(!syncing_bits_set_);
  20 }
  21
  22 // static.
  23 SyncDirectoryCommitContribution* SyncDirectoryCommitContribution::Build(
  24     syncable::Directory* dir,
  25     ModelType type,
  26     size_t max_entries) {
  27   std::vector<int64> metahandles;
  28
  29   syncable::ModelNeutralWriteTransaction trans(FROM_HERE, SYNCER, dir);
  30   GetCommitIdsForType(&trans, type, max_entries, &metahandles);
  31
  32   if (metahandles.empty())
  33     return NULL;
  34
  35   google::protobuf::RepeatedPtrField<sync_pb::SyncEntity> entities;
  36   for (std::vector<int64>::iterator it = metahandles.begin();
  37        it != metahandles.end(); ++it) {
  38     sync_pb::SyncEntity* entity = entities.Add();
  39     syncable::ModelNeutralMutableEntry entry(&trans, GET_BY_HANDLE, *it);
  40     commit_util::BuildCommitItem(entry, entity);
  41     entry.PutSyncing(true);
  42   }
  43
  44   return new SyncDirectoryCommitContribution(metahandles, entities, dir);
  45 }
  46
  47 void SyncDirectoryCommitContribution::AddToCommitMessage(
  48     sync_pb::ClientToServerMessage* msg) {
  49   DCHECK(syncing_bits_set_);
  50   sync_pb::CommitMessage* commit_message = msg->mutable_commit();
  51   entries_start_index_ = commit_message->entries_size();
  52   std::copy(entities_.begin(),
  53             entities_.end(),
  54             RepeatedPtrFieldBackInserter(commit_message->mutable_entries()));
  55 }
  56
  57 SyncerError SyncDirectoryCommitContribution::ProcessCommitResponse(
  58     const sync_pb::ClientToServerResponse& response,
  59     sessions::StatusController* status) {
  60   DCHECK(syncing_bits_set_);
  61   const sync_pb::CommitResponse& commit_response = response.commit();
  62
  63   int transient_error_commits = 0;
  64   int conflicting_commits = 0;
  65   int error_commits = 0;
  66   int successes = 0;
  67
  68   std::set<syncable::Id> deleted_folders;
  69   {
  70     syncable::ModelNeutralWriteTransaction trans(FROM_HERE, SYNCER, dir_);
  71     for (size_t i = 0; i < metahandles_.size(); ++i) {
  72       sync_pb::CommitResponse::ResponseType response_type =
  73           commit_util::ProcessSingleCommitResponse(
  74               &trans,
  75               commit_response.entryresponse(entries_start_index_ + i),
  76               entities_.Get(i),
  77               metahandles_[i],
  78               &deleted_folders);
  79       switch (response_type) {
  80         case sync_pb::CommitResponse::INVALID_MESSAGE:
  81           ++error_commits;
  82           break;
  83         case sync_pb::CommitResponse::CONFLICT:
  84           ++conflicting_commits;
  85           status->increment_num_server_conflicts();
  86           break;
  87         case sync_pb::CommitResponse::SUCCESS:
  88           ++successes;
  89           {
  90             syncable::Entry e(&trans, GET_BY_HANDLE, metahandles_[i]);
  91             if (e.GetModelType() == BOOKMARKS)
  92               status->increment_num_successful_bookmark_commits();
  93           }
  94           status->increment_num_successful_commits();
  95           break;
  96         case sync_pb::CommitResponse::OVER_QUOTA:
  97           // We handle over quota like a retry, which is same as transient.
  98         case sync_pb::CommitResponse::RETRY:
  99         case sync_pb::CommitResponse::TRANSIENT_ERROR:
 100           ++transient_error_commits;
 101           break;
 102         default:
 103           LOG(FATAL) << "Bad return from ProcessSingleCommitResponse";
 104       }
 105     }
 106     MarkDeletedChildrenSynced(dir_, &trans, &deleted_folders);
 107   }
 108
 109   int commit_count = static_cast<int>(metahandles_.size());
 110   if (commit_count == successes) {
 111     return SYNCER_OK;
 112   } else if (error_commits > 0) {
 113     return SERVER_RETURN_UNKNOWN_ERROR;
 114   } else if (transient_error_commits > 0) {
 115     return SERVER_RETURN_TRANSIENT_ERROR;
 116   } else if (conflicting_commits > 0) {
 117     // This means that the server already has an item with this version, but
 118     // we haven't seen that update yet.
 119     //
 120     // A well-behaved client should respond to this by proceeding to the
 121     // download updates phase, fetching the conflicting items, then attempting
 122     // to resolve the conflict.  That's not what this client does.
 123     //
 124     // We don't currently have any code to support that exceptional control
 125     // flow.  Instead, we abort the current sync cycle and start a new one.  The
 126     // end result is the same.
 127     return SERVER_RETURN_CONFLICT;
 128   } else {
 129     LOG(FATAL) << "Inconsistent counts when processing commit response";
 130     return SYNCER_OK;
 131   }
 132 }
 133
 134 void SyncDirectoryCommitContribution::CleanUp() {
 135   DCHECK(syncing_bits_set_);
 136   UnsetSyncingBits();
 137 }
 138
 139 size_t SyncDirectoryCommitContribution::GetNumEntries() const {
 140   return metahandles_.size();
 141 }
 142
 143 SyncDirectoryCommitContribution::SyncDirectoryCommitContribution(
 144     const std::vector<int64>& metahandles,
 145     const google::protobuf::RepeatedPtrField<sync_pb::SyncEntity>& entities,
 146     syncable::Directory* dir)
 147   : dir_(dir),
 148     metahandles_(metahandles),
 149     entities_(entities),
 150     entries_start_index_(0xDEADBEEF),
 151     syncing_bits_set_(true) {
 152 }
 153
 154 void SyncDirectoryCommitContribution::UnsetSyncingBits() {
 155   syncable::ModelNeutralWriteTransaction trans(FROM_HERE, SYNCER, dir_);
 156   for (std::vector<int64>::const_iterator it = metahandles_.begin();
 157        it != metahandles_.end(); ++it) {
 158     syncable::ModelNeutralMutableEntry entry(&trans, GET_BY_HANDLE, *it);
 159     entry.PutSyncing(false);
 160   }
 161   syncing_bits_set_ = false;
 162 }
 163
 164 }  // namespace syncer