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/*
* SPDX-License-Identifier: GPL-2.0-or-later
* SPDX-FileName: SQLiteUtils.cpp
* SPDX-FileContributor: Dmitry Vedenko
*/
#include "SQLiteUtils.h"
#include "sqlite3.h"
namespace audacity::sqlite
{
namespace
{
// This singleton handles initialization/shutdown of the SQLite library.
// It is needed because our local SQLite is built with SQLITE_OMIT_AUTOINIT
// defined.
//
// It's safe to use even if a system version of SQLite is used that didn't
// have SQLITE_OMIT_AUTOINIT defined.
class SQLiteIniter
{
public:
SQLiteIniter()
{
// Enable URI filenames for all connections
mError = Error(sqlite3_config(SQLITE_CONFIG_URI, 1));
if (mError.IsError())
return;
mError =
Error(sqlite3_config(SQLITE_CONFIG_LOG, SQLiteLogCallback, this));
if (mError.IsError())
return;
mError = Error(sqlite3_initialize());
#ifdef NO_SHM
if (mError.IsError())
return;
// Use the "unix-excl" VFS to make access to the DB exclusive. This
// gets rid of the "<database name>-shm" shared memory file.
//
// Though it shouldn't, it doesn't matter if this fails.
auto vfs = sqlite3_vfs_find("unix-excl");
if (vfs)
sqlite3_vfs_register(vfs, 1);
#endif
}
~SQLiteIniter()
{
// This function must be called single-threaded only
// It returns a value, but there's nothing we can do with it
(void)sqlite3_shutdown();
}
static void SQLiteLogCallback(void* initer, int code, const char* msg)
{
SQLiteIniter* self = static_cast<SQLiteIniter*>(initer);
if (self->mLogCallback)
self->mLogCallback(code, msg);
}
Error GetError() const noexcept
{
return mError;
}
void SetLogCallback (LogCallback callback)
{
mLogCallback = std::move(callback);
}
private:
Error mError;
LogCallback mLogCallback;
};
static SQLiteIniter& GetIniter()
{
static SQLiteIniter sIniter;
return sIniter;
}
} // namespace
Error Initialize() noexcept
{
return GetIniter().GetError();
}
void SetLogCallback(LogCallback callback)
{
GetIniter().SetLogCallback(std::move(callback));
}
} // namespace audacity::sqlite
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