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Adding classes, functions, and utilities for common LMDB operations.

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Lee Clagett 2018-09-26 23:54:27 -04:00
parent f2f725d8db
commit 0c7e7bce18
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src/lmdb/error.cpp Normal file
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// Copyright (c) 2014-2018, The Monero Project
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "error.h"
#include <lmdb.h>
#include <string>
namespace {
struct category final : std::error_category
{
virtual const char* name() const noexcept override final
{
return "lmdb::error_category()";
}
virtual std::string message(int value) const override final
{
char const* const msg = mdb_strerror(value);
if (msg)
return msg;
return "Unknown lmdb::error_category() value";
}
virtual std::error_condition default_error_condition(int value) const noexcept override final
{
switch (value)
{
case MDB_KEYEXIST:
case MDB_NOTFOUND:
break; // map to nothing generic
case MDB_PAGE_NOTFOUND:
case MDB_CORRUPTED:
return std::errc::state_not_recoverable;
case MDB_PANIC:
case MDB_VERSION_MISMATCH:
case MDB_INVALID:
break; // map to nothing generic
case MDB_MAP_FULL:
return std::errc::no_buffer_space;
case MDB_DBS_FULL:
break; // map to nothing generic
case MDB_READERS_FULL:
case MDB_TLS_FULL:
return std::errc::no_lock_available;
case MDB_TXN_FULL:
case MDB_CURSOR_FULL:
case MDB_PAGE_FULL:
case MDB_MAP_RESIZED:
break; // map to nothing generic
case MDB_INCOMPATIBLE:
return std::errc::invalid_argument;
case MDB_BAD_RSLOT:
case MDB_BAD_TXN:
case MDB_BAD_VALSIZE:
case MDB_BAD_DBI:
return std::errc::invalid_argument;
default:
return std::error_condition{value, std::generic_category()};
}
return std::error_condition{value, *this};
}
};
}
namespace lmdb
{
std::error_category const& error_category() noexcept
{
static const category instance{};
return instance;
}
}