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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_file_path)
: DirectoryBackingStore(dir_name), backing_file_path_(backing_file_path) {
DCHECK(backing_file_path_.IsAbsolute());
}
OnDiskDirectoryBackingStore::~OnDiskDirectoryBackingStore() {
}
DirOpenResult OnDiskDirectoryBackingStore::TryLoad(
Directory::MetahandlesMap* handles_map,
JournalIndex* delete_journals,
MetahandleSet* metahandles_to_purge,
Directory::KernelLoadInfo* kernel_load_info) {
DCHECK(CalledOnValidThread());
if (!IsOpen()) {
if (!Open(backing_file_path_))
return FAILED_OPEN_DATABASE;
}
if (!InitializeTables())
return FAILED_OPEN_DATABASE;
if (!LoadEntries(handles_map, metahandles_to_purge))
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,
MetahandleSet* metahandles_to_purge,
Directory::KernelLoadInfo* kernel_load_info) {
DCHECK(CalledOnValidThread());
DirOpenResult result = TryLoad(handles_map, delete_journals,
metahandles_to_purge, 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);
ResetAndCreateConnection();
base::DeleteFile(backing_file_path_, false);
result = TryLoad(handles_map, delete_journals, metahandles_to_purge,
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";
}
const base::FilePath& OnDiskDirectoryBackingStore::backing_file_path() const {
DCHECK(CalledOnValidThread());
return backing_file_path_;
}
} // namespace syncable
} // namespace syncer
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