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// Copyright (c) 2012 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 "sync/syncable/on_disk_directory_backing_store.h"
#include "base/logging.h"
#include "base/stl_util.h"
#include "base/metrics/histogram.h"
#include "sync/syncable/syncable-inl.h"
namespace syncer {
namespace syncable {
namespace {
enum HistogramResultEnum {
FIRST_TRY_SUCCESS,
SECOND_TRY_SUCCESS,
SECOND_TRY_FAILURE,
RESULT_COUNT
};
} // namespace
OnDiskDirectoryBackingStore::OnDiskDirectoryBackingStore(
const std::string& dir_name, const base::FilePath& backing_filepath)
: DirectoryBackingStore(dir_name),
allow_failure_for_test_(false),
backing_filepath_(backing_filepath) {
db_->set_exclusive_locking();
db_->set_page_size(4096);
}
OnDiskDirectoryBackingStore::~OnDiskDirectoryBackingStore() { }
DirOpenResult OnDiskDirectoryBackingStore::TryLoad(
Directory::MetahandlesMap* handles_map,
JournalIndex* delete_journals,
Directory::KernelLoadInfo* kernel_load_info) {
DCHECK(CalledOnValidThread());
if (!db_->is_open()) {
if (!db_->Open(backing_filepath_))
return FAILED_OPEN_DATABASE;
}
if (!InitializeTables())
return FAILED_OPEN_DATABASE;
if (!DropDeletedEntries())
return FAILED_DATABASE_CORRUPT;
if (!LoadEntries(handles_map))
return FAILED_DATABASE_CORRUPT;
if (!LoadDeleteJournals(delete_journals))
return FAILED_DATABASE_CORRUPT;
if (!LoadInfo(kernel_load_info))
return FAILED_DATABASE_CORRUPT;
if (!VerifyReferenceIntegrity(handles_map))
return FAILED_DATABASE_CORRUPT;
return OPENED;
}
DirOpenResult OnDiskDirectoryBackingStore::Load(
Directory::MetahandlesMap* handles_map,
JournalIndex* delete_journals,
Directory::KernelLoadInfo* kernel_load_info) {
DirOpenResult result = TryLoad(handles_map, delete_journals,
kernel_load_info);
if (result == OPENED) {
UMA_HISTOGRAM_ENUMERATION(
"Sync.DirectoryOpenResult", FIRST_TRY_SUCCESS, RESULT_COUNT);
return OPENED;
}
ReportFirstTryOpenFailure();
// The fallback: delete the current database and return a fresh one. We can
// fetch the user's data from the cloud.
STLDeleteValues(handles_map);
STLDeleteElements(delete_journals);
db_.reset(new sql::Connection);
// TODO: Manually propagating the default database settings is
// brittle. Either have a helper to set these up (or generate a new
// connection), or add something like Reset() to sql::Connection.
db_->set_exclusive_locking();
db_->set_page_size(4096);
db_->set_histogram_tag("SyncDirectory");
base::DeleteFile(backing_filepath_, false);
result = TryLoad(handles_map, delete_journals, kernel_load_info);
if (result == OPENED) {
UMA_HISTOGRAM_ENUMERATION(
"Sync.DirectoryOpenResult", SECOND_TRY_SUCCESS, RESULT_COUNT);
} else {
UMA_HISTOGRAM_ENUMERATION(
"Sync.DirectoryOpenResult", SECOND_TRY_FAILURE, RESULT_COUNT);
}
return result;
}
void OnDiskDirectoryBackingStore::ReportFirstTryOpenFailure() {
// In debug builds, the last thing we want is to silently clear the database.
// It's full of evidence that might help us determine what went wrong. It
// might be sqlite's fault, but it could also be a bug in sync. We crash
// immediately so a developer can investigate.
//
// Developers: If you're not interested in debugging this right now, just move
// aside the 'Sync Data' directory in your profile. This is similar to what
// the code would do if this DCHECK were disabled.
NOTREACHED() << "Crashing to preserve corrupt sync database";
}
} // namespace syncable
} // namespace syncer
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