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|
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/sync_driver/data_type_manager_impl.h"
#include <algorithm>
#include <functional>
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/logging.h"
#include "base/metrics/histogram_macros.h"
#include "base/profiler/scoped_tracker.h"
#include "base/strings/stringprintf.h"
#include "base/trace_event/trace_event.h"
#include "components/sync_driver/data_type_controller.h"
#include "components/sync_driver/data_type_encryption_handler.h"
#include "components/sync_driver/data_type_manager_observer.h"
#include "components/sync_driver/data_type_status_table.h"
#include "sync/internal_api/public/data_type_debug_info_listener.h"
namespace sync_driver {
namespace {
DataTypeStatusTable::TypeErrorMap
GenerateCryptoErrorsForTypes(syncer::ModelTypeSet encrypted_types) {
DataTypeStatusTable::TypeErrorMap crypto_errors;
for (syncer::ModelTypeSet::Iterator iter = encrypted_types.First();
iter.Good(); iter.Inc()) {
crypto_errors[iter.Get()] = syncer::SyncError(
FROM_HERE,
syncer::SyncError::CRYPTO_ERROR,
"",
iter.Get());
}
return crypto_errors;
}
} // namespace
DataTypeManagerImpl::AssociationTypesInfo::AssociationTypesInfo() {}
DataTypeManagerImpl::AssociationTypesInfo::~AssociationTypesInfo() {}
DataTypeManagerImpl::DataTypeManagerImpl(
const base::Closure& unrecoverable_error_method,
const syncer::WeakHandle<syncer::DataTypeDebugInfoListener>&
debug_info_listener,
const DataTypeController::TypeMap* controllers,
const DataTypeEncryptionHandler* encryption_handler,
BackendDataTypeConfigurer* configurer,
DataTypeManagerObserver* observer)
: configurer_(configurer),
controllers_(controllers),
state_(DataTypeManager::STOPPED),
needs_reconfigure_(false),
last_configure_reason_(syncer::CONFIGURE_REASON_UNKNOWN),
debug_info_listener_(debug_info_listener),
model_association_manager_(controllers, this),
observer_(observer),
encryption_handler_(encryption_handler),
unrecoverable_error_method_(unrecoverable_error_method),
catch_up_in_progress_(false),
weak_ptr_factory_(this) {
DCHECK(configurer_);
DCHECK(observer_);
}
DataTypeManagerImpl::~DataTypeManagerImpl() {}
void DataTypeManagerImpl::Configure(syncer::ModelTypeSet desired_types,
syncer::ConfigureReason reason) {
// Once requested, we will remain in "catch up" mode until we notify the
// caller (see NotifyDone). We do this to ensure that once started, subsequent
// calls to Configure won't take us out of "catch up" mode.
if (reason == syncer::CONFIGURE_REASON_CATCH_UP)
catch_up_in_progress_ = true;
if (reason == syncer::CONFIGURE_REASON_BACKUP_ROLLBACK)
desired_types.PutAll(syncer::ControlTypes());
else
desired_types.PutAll(syncer::CoreTypes());
// Only allow control types and types that have controllers.
syncer::ModelTypeSet filtered_desired_types;
for (syncer::ModelTypeSet::Iterator type = desired_types.First();
type.Good(); type.Inc()) {
DataTypeController::TypeMap::const_iterator iter =
controllers_->find(type.Get());
if (syncer::IsControlType(type.Get()) || iter != controllers_->end()) {
if (iter != controllers_->end()) {
if (!iter->second->ReadyForStart() &&
!data_type_status_table_.GetUnreadyErrorTypes().Has(
type.Get())) {
// Add the type to the unready types set to prevent purging it. It's
// up to the datatype controller to, if necessary, explicitly
// mark the type as broken to trigger a purge.
syncer::SyncError error(FROM_HERE,
syncer::SyncError::UNREADY_ERROR,
"Datatype not ready at config time.",
type.Get());
std::map<syncer::ModelType, syncer::SyncError> errors;
errors[type.Get()] = error;
data_type_status_table_.UpdateFailedDataTypes(errors);
} else if (iter->second->ReadyForStart()) {
data_type_status_table_.ResetUnreadyErrorFor(type.Get());
}
}
filtered_desired_types.Put(type.Get());
}
}
ConfigureImpl(filtered_desired_types, reason);
}
void DataTypeManagerImpl::ReenableType(syncer::ModelType type) {
// TODO(zea): move the "should we reconfigure" logic into the datatype handler
// itself.
// Only reconfigure if the type actually had a data type or unready error.
if (!data_type_status_table_.ResetDataTypeErrorFor(type) &&
!data_type_status_table_.ResetUnreadyErrorFor(type)) {
return;
}
// Only reconfigure if the type is actually desired.
if (!last_requested_types_.Has(type))
return;
DVLOG(1) << "Reenabling " << syncer::ModelTypeToString(type);
needs_reconfigure_ = true;
last_configure_reason_ = syncer::CONFIGURE_REASON_PROGRAMMATIC;
ProcessReconfigure();
}
void DataTypeManagerImpl::ResetDataTypeErrors() {
data_type_status_table_.Reset();
}
void DataTypeManagerImpl::PurgeForMigration(
syncer::ModelTypeSet undesired_types,
syncer::ConfigureReason reason) {
syncer::ModelTypeSet remainder = Difference(last_requested_types_,
undesired_types);
ConfigureImpl(remainder, reason);
}
void DataTypeManagerImpl::ConfigureImpl(
syncer::ModelTypeSet desired_types,
syncer::ConfigureReason reason) {
DCHECK_NE(reason, syncer::CONFIGURE_REASON_UNKNOWN);
DVLOG(1) << "Configuring for " << syncer::ModelTypeSetToString(desired_types)
<< " with reason " << reason;
if (state_ == STOPPING) {
// You can not set a configuration while stopping.
LOG(ERROR) << "Configuration set while stopping.";
return;
}
// TODO(zea): consider not performing a full configuration once there's a
// reliable way to determine if the requested set of enabled types matches the
// current set.
last_requested_types_ = desired_types;
last_configure_reason_ = reason;
// Only proceed if we're in a steady state or retrying.
if (state_ != STOPPED && state_ != CONFIGURED && state_ != RETRYING) {
DVLOG(1) << "Received configure request while configuration in flight. "
<< "Postponing until current configuration complete.";
needs_reconfigure_ = true;
return;
}
Restart(reason);
}
BackendDataTypeConfigurer::DataTypeConfigStateMap
DataTypeManagerImpl::BuildDataTypeConfigStateMap(
const syncer::ModelTypeSet& types_being_configured) const {
// 1. Get the failed types (due to fatal, crypto, and unready errors).
// 2. Add the difference between last_requested_types_ and the failed types
// as CONFIGURE_INACTIVE.
// 3. Flip |types_being_configured| to CONFIGURE_ACTIVE.
// 4. Set non-enabled user types as DISABLED.
// 5. Set the fatal, crypto, and unready types to their respective states.
syncer::ModelTypeSet error_types =
data_type_status_table_.GetFailedTypes();
syncer::ModelTypeSet fatal_types =
data_type_status_table_.GetFatalErrorTypes();
syncer::ModelTypeSet crypto_types =
data_type_status_table_.GetCryptoErrorTypes();
syncer::ModelTypeSet unready_types=
data_type_status_table_.GetUnreadyErrorTypes();
// Types with persistence errors are only purged/resynced when they're
// actively being configured.
syncer::ModelTypeSet clean_types =
data_type_status_table_.GetPersistenceErrorTypes();
clean_types.RetainAll(types_being_configured);
// Types with unready errors do not count as unready if they've been disabled.
unready_types.RetainAll(last_requested_types_);
syncer::ModelTypeSet enabled_types = last_requested_types_;
enabled_types.RemoveAll(error_types);
// If we're catching up, add all enabled (non-error) types to the clean set to
// ensure we download and apply them to the model types.
if (catch_up_in_progress_)
clean_types.PutAll(enabled_types);
syncer::ModelTypeSet disabled_types =
syncer::Difference(
syncer::Union(syncer::UserTypes(), syncer::ControlTypes()),
enabled_types);
syncer::ModelTypeSet to_configure = syncer::Intersection(
enabled_types, types_being_configured);
DVLOG(1) << "Enabling: " << syncer::ModelTypeSetToString(enabled_types);
DVLOG(1) << "Configuring: " << syncer::ModelTypeSetToString(to_configure);
DVLOG(1) << "Disabling: " << syncer::ModelTypeSetToString(disabled_types);
BackendDataTypeConfigurer::DataTypeConfigStateMap config_state_map;
BackendDataTypeConfigurer::SetDataTypesState(
BackendDataTypeConfigurer::CONFIGURE_INACTIVE, enabled_types,
&config_state_map);
BackendDataTypeConfigurer::SetDataTypesState(
BackendDataTypeConfigurer::CONFIGURE_ACTIVE, to_configure,
&config_state_map);
BackendDataTypeConfigurer::SetDataTypesState(
BackendDataTypeConfigurer::CONFIGURE_CLEAN, clean_types,
&config_state_map);
BackendDataTypeConfigurer::SetDataTypesState(
BackendDataTypeConfigurer::DISABLED, disabled_types,
&config_state_map);
BackendDataTypeConfigurer::SetDataTypesState(
BackendDataTypeConfigurer::FATAL, fatal_types,
&config_state_map);
BackendDataTypeConfigurer::SetDataTypesState(
BackendDataTypeConfigurer::CRYPTO, crypto_types,
&config_state_map);
BackendDataTypeConfigurer::SetDataTypesState(
BackendDataTypeConfigurer::UNREADY, unready_types,
&config_state_map);
return config_state_map;
}
void DataTypeManagerImpl::Restart(syncer::ConfigureReason reason) {
DVLOG(1) << "Restarting...";
// Only record the type histograms for user-triggered configurations or
// restarts.
if (reason == syncer::CONFIGURE_REASON_RECONFIGURATION ||
reason == syncer::CONFIGURE_REASON_NEW_CLIENT ||
reason == syncer::CONFIGURE_REASON_NEWLY_ENABLED_DATA_TYPE) {
for (syncer::ModelTypeSet::Iterator iter = last_requested_types_.First();
iter.Good(); iter.Inc()) {
UMA_HISTOGRAM_ENUMERATION("Sync.ConfigureDataTypes",
syncer::ModelTypeToHistogramInt(iter.Get()),
syncer::MODEL_TYPE_COUNT);
}
}
// Check for new or resolved data type crypto errors.
if (encryption_handler_->IsPassphraseRequired()) {
syncer::ModelTypeSet encrypted_types =
encryption_handler_->GetEncryptedDataTypes();
encrypted_types.RetainAll(last_requested_types_);
encrypted_types.RemoveAll(
data_type_status_table_.GetCryptoErrorTypes());
DataTypeStatusTable::TypeErrorMap crypto_errors =
GenerateCryptoErrorsForTypes(encrypted_types);
data_type_status_table_.UpdateFailedDataTypes(crypto_errors);
} else {
data_type_status_table_.ResetCryptoErrors();
}
syncer::ModelTypeSet failed_types =
data_type_status_table_.GetFailedTypes();
syncer::ModelTypeSet enabled_types =
syncer::Difference(last_requested_types_, failed_types);
last_restart_time_ = base::Time::Now();
configuration_stats_.clear();
DCHECK(state_ == STOPPED || state_ == CONFIGURED || state_ == RETRYING);
const State old_state = state_;
state_ = CONFIGURING;
// Starting from a "steady state" (stopped or configured) state
// should send a start notification.
// Note: NotifyStart() must be called with the updated (non-idle) state,
// otherwise logic listening for the configuration start might not be aware
// of the fact that the DTM is in a configuration state.
if (old_state == STOPPED || old_state == CONFIGURED)
NotifyStart();
download_types_queue_ = PrioritizeTypes(enabled_types);
association_types_queue_ = std::queue<AssociationTypesInfo>();
// If we're performing a "catch up", first stop the model types to ensure the
// call to Initialize triggers model association.
if (catch_up_in_progress_)
model_association_manager_.Stop();
model_association_manager_.Initialize(enabled_types);
StartNextDownload(syncer::ModelTypeSet());
}
syncer::ModelTypeSet DataTypeManagerImpl::GetPriorityTypes() const {
syncer::ModelTypeSet high_priority_types;
high_priority_types.PutAll(syncer::PriorityCoreTypes());
high_priority_types.PutAll(syncer::PriorityUserTypes());
return high_priority_types;
}
TypeSetPriorityList DataTypeManagerImpl::PrioritizeTypes(
const syncer::ModelTypeSet& types) {
syncer::ModelTypeSet high_priority_types = GetPriorityTypes();
high_priority_types.RetainAll(types);
syncer::ModelTypeSet low_priority_types =
syncer::Difference(types, high_priority_types);
TypeSetPriorityList result;
if (!high_priority_types.Empty())
result.push(high_priority_types);
if (!low_priority_types.Empty())
result.push(low_priority_types);
// Could be empty in case of purging for migration, sync nothing, etc.
// Configure empty set to purge data from backend.
if (result.empty())
result.push(syncer::ModelTypeSet());
return result;
}
void DataTypeManagerImpl::ProcessReconfigure() {
DCHECK(needs_reconfigure_);
// Wait for current download and association to finish.
if (!download_types_queue_.empty() ||
model_association_manager_.state() ==
ModelAssociationManager::ASSOCIATING) {
return;
}
association_types_queue_ = std::queue<AssociationTypesInfo>();
// An attempt was made to reconfigure while we were already configuring.
// This can be because a passphrase was accepted or the user changed the
// set of desired types. Either way, |last_requested_types_| will contain
// the most recent set of desired types, so we just call configure.
// Note: we do this whether or not GetControllersNeedingStart is true,
// because we may need to stop datatypes.
DVLOG(1) << "Reconfiguring due to previous configure attempt occuring while"
<< " busy.";
// Note: ConfigureImpl is called directly, rather than posted, in order to
// ensure that any purging/unapplying/journaling happens while the set of
// failed types is still up to date. If stack unwinding were to be done
// via PostTask, the failed data types may be reset before the purging was
// performed.
state_ = RETRYING;
needs_reconfigure_ = false;
ConfigureImpl(last_requested_types_, last_configure_reason_);
}
void DataTypeManagerImpl::OnDownloadRetry() {
DCHECK_EQ(CONFIGURING, state_);
}
void DataTypeManagerImpl::DownloadReady(
syncer::ModelTypeSet types_to_download,
syncer::ModelTypeSet first_sync_types,
syncer::ModelTypeSet failed_configuration_types) {
DCHECK_EQ(CONFIGURING, state_);
// Persistence errors are reset after each backend configuration attempt
// during which they would have been purged.
data_type_status_table_.ResetPersistenceErrorsFrom(types_to_download);
if (!failed_configuration_types.Empty()) {
DataTypeStatusTable::TypeErrorMap errors;
for (syncer::ModelTypeSet::Iterator iter =
failed_configuration_types.First(); iter.Good(); iter.Inc()) {
syncer::SyncError error(
FROM_HERE,
syncer::SyncError::DATATYPE_ERROR,
"Backend failed to download type.",
iter.Get());
errors[iter.Get()] = error;
}
data_type_status_table_.UpdateFailedDataTypes(errors);
needs_reconfigure_ = true;
}
if (needs_reconfigure_) {
download_types_queue_ = TypeSetPriorityList();
ProcessReconfigure();
return;
}
CHECK(!download_types_queue_.empty());
download_types_queue_.pop();
// Those types that were already downloaded (non first sync/error types)
// should already be associating. Just kick off association of the newly
// downloaded types if necessary.
if (!association_types_queue_.empty()) {
association_types_queue_.back().first_sync_types = first_sync_types;
association_types_queue_.back().download_ready_time = base::Time::Now();
StartNextAssociation(UNREADY_AT_CONFIG);
} else if (download_types_queue_.empty() &&
model_association_manager_.state() !=
ModelAssociationManager::ASSOCIATING) {
// There's nothing more to download or associate (implying either there were
// no types to associate or they associated as part of |ready_types|).
// If the model association manager is also finished, then we're done
// configuring.
state_ = CONFIGURED;
ConfigureResult result(OK, last_requested_types_);
NotifyDone(result);
return;
}
StartNextDownload(types_to_download);
}
void DataTypeManagerImpl::StartNextDownload(
syncer::ModelTypeSet high_priority_types_before) {
if (download_types_queue_.empty())
return;
// Tell the backend about the new set of data types we wish to sync.
// The task will be invoked when updates are downloaded.
syncer::ModelTypeSet ready_types = configurer_->ConfigureDataTypes(
last_configure_reason_,
BuildDataTypeConfigStateMap(download_types_queue_.front()),
base::Bind(&DataTypeManagerImpl::DownloadReady,
weak_ptr_factory_.GetWeakPtr(),
download_types_queue_.front()),
base::Bind(&DataTypeManagerImpl::OnDownloadRetry,
weak_ptr_factory_.GetWeakPtr()));
AssociationTypesInfo association_info;
association_info.types = download_types_queue_.front();
association_info.ready_types = ready_types;
association_info.download_start_time = base::Time::Now();
association_info.high_priority_types_before = high_priority_types_before;
association_types_queue_.push(association_info);
// Start associating those types that are already downloaded (does nothing
// if model associator is busy).
StartNextAssociation(READY_AT_CONFIG);
}
void DataTypeManagerImpl::StartNextAssociation(AssociationGroup group) {
CHECK(!association_types_queue_.empty());
// If the model association manager is already associating, let it finish.
// The model association done event will result in associating any remaining
// association groups.
if (model_association_manager_.state() !=
ModelAssociationManager::INITIALIZED) {
return;
}
syncer::ModelTypeSet types_to_associate;
if (group == READY_AT_CONFIG) {
association_types_queue_.front().ready_association_request_time =
base::Time::Now();
types_to_associate = association_types_queue_.front().ready_types;
} else {
DCHECK_EQ(UNREADY_AT_CONFIG, group);
// Only start associating the rest of the types if they have all finished
// downloading.
if (association_types_queue_.front().download_ready_time.is_null())
return;
association_types_queue_.front().full_association_request_time =
base::Time::Now();
// We request the full set of types here for completeness sake. All types
// within the READY_AT_CONFIG set will already be started and should be
// no-ops.
types_to_associate = association_types_queue_.front().types;
}
DVLOG(1) << "Associating "
<< syncer::ModelTypeSetToString(types_to_associate);
model_association_manager_.StartAssociationAsync(types_to_associate);
}
void DataTypeManagerImpl::OnSingleDataTypeWillStop(
syncer::ModelType type,
const syncer::SyncError& error) {
configurer_->DeactivateDataType(type);
if (error.IsSet()) {
DataTypeStatusTable::TypeErrorMap failed_types;
failed_types[type] = error;
data_type_status_table_.UpdateFailedDataTypes(
failed_types);
// Unrecoverable errors will shut down the entire backend, so no need to
// reconfigure.
if (error.error_type() != syncer::SyncError::UNRECOVERABLE_ERROR) {
needs_reconfigure_ = true;
last_configure_reason_ = syncer::CONFIGURE_REASON_PROGRAMMATIC;
ProcessReconfigure();
}
}
}
void DataTypeManagerImpl::OnSingleDataTypeAssociationDone(
syncer::ModelType type,
const syncer::DataTypeAssociationStats& association_stats) {
DCHECK(!association_types_queue_.empty());
DataTypeController::TypeMap::const_iterator c_it = controllers_->find(type);
DCHECK(c_it != controllers_->end());
if (c_it->second->state() == DataTypeController::RUNNING) {
// Tell the backend about the change processor for this type so it can
// begin routing changes to it.
configurer_->ActivateDataType(type, c_it->second->model_safe_group(),
c_it->second->GetChangeProcessor());
}
if (!debug_info_listener_.IsInitialized())
return;
AssociationTypesInfo& info = association_types_queue_.front();
configuration_stats_.push_back(syncer::DataTypeConfigurationStats());
configuration_stats_.back().model_type = type;
configuration_stats_.back().association_stats = association_stats;
if (info.types.Has(type)) {
// Times in |info| only apply to non-slow types.
configuration_stats_.back().download_wait_time =
info.download_start_time - last_restart_time_;
if (info.first_sync_types.Has(type)) {
configuration_stats_.back().download_time =
info.download_ready_time - info.download_start_time;
}
if (info.ready_types.Has(type)) {
configuration_stats_.back().association_wait_time_for_high_priority =
info.ready_association_request_time - info.download_start_time;
} else {
configuration_stats_.back().association_wait_time_for_high_priority =
info.full_association_request_time - info.download_ready_time;
}
configuration_stats_.back().high_priority_types_configured_before =
info.high_priority_types_before;
configuration_stats_.back().same_priority_types_configured_before =
info.configured_types;
info.configured_types.Put(type);
}
}
void DataTypeManagerImpl::OnModelAssociationDone(
const DataTypeManager::ConfigureResult& result) {
DCHECK(state_ == STOPPING || state_ == CONFIGURING);
if (state_ == STOPPING)
return;
// Ignore abort/unrecoverable error if we need to reconfigure anyways.
if (needs_reconfigure_) {
ProcessReconfigure();
return;
}
if (result.status == ABORTED || result.status == UNRECOVERABLE_ERROR) {
Abort(result.status);
return;
}
DCHECK(result.status == OK);
CHECK(!association_types_queue_.empty());
// If this model association was for the full set of types, then this priority
// set is done. Otherwise it was just the ready types and the unready types
// still need to be associated.
if (result.requested_types.Equals(association_types_queue_.front().types)) {
association_types_queue_.pop();
if (!association_types_queue_.empty()) {
StartNextAssociation(READY_AT_CONFIG);
} else if (download_types_queue_.empty()) {
state_ = CONFIGURED;
NotifyDone(result);
}
} else {
DCHECK(result.requested_types.Equals(
association_types_queue_.front().ready_types));
// Will do nothing if the types are still downloading.
StartNextAssociation(UNREADY_AT_CONFIG);
}
}
void DataTypeManagerImpl::Stop() {
if (state_ == STOPPED)
return;
bool need_to_notify = state_ == CONFIGURING;
StopImpl();
if (need_to_notify) {
ConfigureResult result(ABORTED,
last_requested_types_);
NotifyDone(result);
}
}
void DataTypeManagerImpl::Abort(ConfigureStatus status) {
DCHECK_EQ(CONFIGURING, state_);
StopImpl();
DCHECK_NE(OK, status);
ConfigureResult result(status,
last_requested_types_);
NotifyDone(result);
}
void DataTypeManagerImpl::StopImpl() {
state_ = STOPPING;
// Invalidate weak pointer to drop download callbacks.
weak_ptr_factory_.InvalidateWeakPtrs();
// Stop all data types. This may trigger association callback but the
// callback will do nothing because state is set to STOPPING above.
model_association_manager_.Stop();
state_ = STOPPED;
}
void DataTypeManagerImpl::NotifyStart() {
observer_->OnConfigureStart();
}
void DataTypeManagerImpl::NotifyDone(const ConfigureResult& raw_result) {
catch_up_in_progress_ = false;
AddToConfigureTime();
ConfigureResult result = raw_result;
result.data_type_status_table = data_type_status_table_;
DVLOG(1) << "Total time spent configuring: "
<< configure_time_delta_.InSecondsF() << "s";
switch (result.status) {
case DataTypeManager::OK:
DVLOG(1) << "NotifyDone called with result: OK";
UMA_HISTOGRAM_LONG_TIMES("Sync.ConfigureTime_Long.OK",
configure_time_delta_);
if (debug_info_listener_.IsInitialized() &&
!configuration_stats_.empty()) {
debug_info_listener_.Call(
FROM_HERE,
&syncer::DataTypeDebugInfoListener::OnDataTypeConfigureComplete,
configuration_stats_);
}
configuration_stats_.clear();
break;
case DataTypeManager::ABORTED:
DVLOG(1) << "NotifyDone called with result: ABORTED";
UMA_HISTOGRAM_LONG_TIMES("Sync.ConfigureTime_Long.ABORTED",
configure_time_delta_);
break;
case DataTypeManager::UNRECOVERABLE_ERROR:
DVLOG(1) << "NotifyDone called with result: UNRECOVERABLE_ERROR";
UMA_HISTOGRAM_LONG_TIMES("Sync.ConfigureTime_Long.UNRECOVERABLE_ERROR",
configure_time_delta_);
break;
case DataTypeManager::UNKNOWN:
NOTREACHED();
break;
}
observer_->OnConfigureDone(result);
}
DataTypeManager::State DataTypeManagerImpl::state() const {
return state_;
}
void DataTypeManagerImpl::AddToConfigureTime() {
DCHECK(!last_restart_time_.is_null());
configure_time_delta_ += (base::Time::Now() - last_restart_time_);
}
} // namespace sync_driver
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