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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 "chrome/browser/sync/backup_rollback_controller.h"
#include "base/command_line.h"
#include "base/message_loop/message_loop.h"
#include "base/metrics/field_trial.h"
#include "chrome/browser/sync/supervised_user_signin_manager_wrapper.h"
#include "chrome/common/chrome_switches.h"
#include "components/sync_driver/sync_prefs.h"
namespace browser_sync {
#if defined(ENABLE_PRE_SYNC_BACKUP)
// Number of rollback attempts to try before giving up.
static const int kRollbackLimits = 3;
// Finch experiment name and group.
static char kSyncBackupFinchName[] = "SyncBackup";
static char kSyncBackupFinchDisabled[] = "disabled";
#endif
BackupRollbackController::BackupRollbackController(
sync_driver::SyncPrefs* sync_prefs,
const SupervisedUserSigninManagerWrapper* signin,
base::Closure start_backup,
base::Closure start_rollback)
: sync_prefs_(sync_prefs),
signin_(signin),
start_backup_(start_backup),
start_rollback_(start_rollback) {
}
BackupRollbackController::~BackupRollbackController() {
}
bool BackupRollbackController::StartBackup() {
if (!IsBackupEnabled())
return false;
// Disable rollback to previous backup DB because it will be overwritten by
// new backup.
sync_prefs_->SetRemainingRollbackTries(0);
base::MessageLoop::current()->PostTask(FROM_HERE, start_backup_);
return true;
}
bool BackupRollbackController::StartRollback() {
if (!IsBackupEnabled())
return false;
// Don't roll back if disabled or user is signed in.
if (CommandLine::ForCurrentProcess()->HasSwitch(
switches::kSyncDisableRollback) ||
!signin_->GetEffectiveUsername().empty()) {
sync_prefs_->SetRemainingRollbackTries(0);
return false;
}
int rollback_tries = sync_prefs_->GetRemainingRollbackTries();
if (rollback_tries <= 0)
return false; // No pending rollback.
sync_prefs_->SetRemainingRollbackTries(rollback_tries - 1);
base::MessageLoop::current()->PostTask(FROM_HERE, start_rollback_);
return true;
}
void BackupRollbackController::OnRollbackReceived() {
#if defined(ENABLE_PRE_SYNC_BACKUP)
sync_prefs_->SetRemainingRollbackTries(kRollbackLimits);
#endif
}
void BackupRollbackController::OnRollbackDone() {
#if defined(ENABLE_PRE_SYNC_BACKUP)
sync_prefs_->SetRemainingRollbackTries(0);
#endif
}
// static
bool BackupRollbackController::IsBackupEnabled() {
#if defined(ENABLE_PRE_SYNC_BACKUP)
const std::string group_name =
base::FieldTrialList::FindFullName(kSyncBackupFinchName);
if (CommandLine::ForCurrentProcess()->HasSwitch(
switches::kSyncDisableBackup) ||
group_name == kSyncBackupFinchDisabled) {
return false;
}
return true;
#else
return false;
#endif
}
} // namespace browser_sync
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