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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 "chrome/browser/media_gallery/media_gallery_database.h"
#include <algorithm>
#include <string>
#include "base/file_path.h"
#include "base/logging.h"
#include "sql/diagnostic_error_delegate.h"
#include "sql/statement.h"
#include "sql/transaction.h"
#if defined(OS_WIN)
#include "base/string_util.h"
#include "base/sys_string_conversions.h"
#endif // OS_WIN
#define MEDIA_GALLERY_COLLECTION_ROW_FIELDS \
" collections.id, collections.path, collections.last_modified_time, " \
"collections.entry_count, collections.all_parsed "
namespace chrome {
namespace {
const int kCurrentVersionNumber = 1;
const int kCompatibleVersionNumber = 1;
const FilePath::CharType kMediaGalleryDatabaseName[] =
FILE_PATH_LITERAL(".media_gallery.db");
class HistogramName {
public:
static const char* name() {
return "Sqlite.MediaGallery.Error";
}
};
} // namespace
MediaGalleryDatabase::MediaGalleryDatabase() { }
MediaGalleryDatabase::~MediaGalleryDatabase() { }
sql::InitStatus MediaGalleryDatabase::Init(const FilePath& database_dir) {
// Set the exceptional sqlite error handler.
db_.set_error_delegate(new sql::DiagnosticErrorDelegate<HistogramName>());
// Set the database page size to something a little larger to give us
// better performance (we're typically seek rather than bandwidth limited).
// This only has an effect before any tables have been created, otherwise
// this is a NOP. Must be a power of 2 and a max of 8192.
db_.set_page_size(4096);
// Increase the cache size. The page size, plus a little extra, times this
// value, tells us how much memory the cache will use maximum.
// 6000 * 4KB = 24MB
db_.set_cache_size(6000);
if (!db_.Open(database_dir.Append(FilePath(kMediaGalleryDatabaseName))))
return sql::INIT_FAILURE;
return InitInternal(&db_);
}
sql::InitStatus MediaGalleryDatabase::InitInternal(sql::Connection* db) {
// Wrap the rest of init in a tranaction. This will prevent the database from
// getting corrupted if we crash in the middle of initialization or migration.
sql::Transaction committer(db);
if (!committer.Begin())
return sql::INIT_FAILURE;
// Prime the cache.
db->Preload();
// Create the tables and indices.
if (!meta_table_.Init(db, GetCurrentVersion(), kCompatibleVersionNumber))
return sql::INIT_FAILURE;
if (!CreateCollectionsTable(db))
return sql::INIT_FAILURE;
// Version check.
sql::InitStatus version_status = EnsureCurrentVersion();
if (version_status != sql::INIT_OK)
return version_status;
return committer.Commit() ? sql::INIT_OK : sql::INIT_FAILURE;
}
sql::Connection& MediaGalleryDatabase::GetDB() {
return db_;
}
sql::InitStatus MediaGalleryDatabase::EnsureCurrentVersion() {
// We can't read databases newer than we were designed for.
if (meta_table_.GetCompatibleVersionNumber() > kCurrentVersionNumber) {
VLOG(1) << "Media Gallery database is too new.";
return sql::INIT_TOO_NEW;
}
int cur_version = meta_table_.GetVersionNumber();
if (cur_version == 0) {
DVLOG(1) << "Initializing the Media Gallery database.";
++cur_version;
meta_table_.SetVersionNumber(cur_version);
meta_table_.SetCompatibleVersionNumber(
std::min(cur_version, kCompatibleVersionNumber));
}
return sql::INIT_OK;
}
// static
int MediaGalleryDatabase::GetCurrentVersion() {
return kCurrentVersionNumber;
}
CollectionId MediaGalleryDatabase::CreateCollectionRow(
CollectionRow* row) {
const char* sql = "INSERT INTO collections"
"(path, last_modified_time, entry_count, all_parsed) "
"VALUES(?, ?, ?, ?)";
sql::Statement statement(GetDB().GetCachedStatement(SQL_FROM_HERE, sql));
#if defined(OS_WIN)
// We standardize on UTF8 encoding for paths.
std::string path(base::SysWideToUTF8(row->path.value()));
#elif defined(OS_POSIX)
std::string path(row->path.value());
#endif
#if defined(FILE_PATH_USES_WIN_SEPARATORS)
// We standardize on POSIX-style paths, since any platform can understand
// them.
ReplaceChars(path, "\\", "/", &path);
#endif // FILE_PATH_USES_WIN_SEPARATORS
statement.BindString(0, path.c_str());
statement.BindInt64(1, row->last_modified_time.ToInternalValue());
statement.BindInt(2, row->entry_count);
statement.BindInt(3, row->all_parsed ? 1 : 0);
if (!statement.Run()) {
VLOG(0) << "Failed to add collection " << row->path.value()
<< " to table media_gallery.collections";
return 0;
}
return row->id = GetDB().GetLastInsertRowId();
}
bool MediaGalleryDatabase::GetCollectionRow(CollectionId id,
CollectionRow* row) {
sql::Statement statement(GetDB().GetCachedStatement(SQL_FROM_HERE,
"SELECT" MEDIA_GALLERY_COLLECTION_ROW_FIELDS
"FROM collections WHERE id=?"));
statement.BindInt64(0, id);
if (statement.Step()) {
FillCollectionRow(statement, row);
return true;
}
return false;
}
// Convenience method to fill a row from a statement. Must be in sync with the
// columns in MEDIA_GALLERY_COLLECTION_ROW_FIELDS
void MediaGalleryDatabase::FillCollectionRow(const sql::Statement& statement,
CollectionRow* row) {
row->id = statement.ColumnInt64(0);
#if defined(OS_WIN)
row->path = FilePath(base::SysUTF8ToWide(statement.ColumnString(1)));
#elif defined(OS_POSIX)
row->path = FilePath(statement.ColumnString(1));
#endif // OS_WIN
row->last_modified_time = base::Time::FromInternalValue(
statement.ColumnInt64(2));
row->entry_count = statement.ColumnInt(3);
row->all_parsed = statement.ColumnInt(4) != 0;
}
// static
bool MediaGalleryDatabase::DoesCollectionsTableExist(sql::Connection *db) {
return db->DoesTableExist("collections");
}
// static
bool MediaGalleryDatabase::CreateCollectionsTable(sql::Connection* db) {
if (DoesCollectionsTableExist(db))
return true;
// TODO(tpayne): Add unique constraint on path once we standardize on path
// format.
return db->Execute("CREATE TABLE collections"
"(id INTEGER PRIMARY KEY,"
" path LONGVARCHAR NOT NULL,"
" last_modified_time INTEGER NOT NULL,"
" entry_count INTEGER DEFAULT 0 NOT NULL,"
" all_parsed INTEGER DEFAULT 0 NOT NULL)");
}
} // namespace chrome
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