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96 lines
3.4 KiB
96 lines
3.4 KiB
// Copyright (c) 2018, The Monero Project
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#pragma once
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#include <lmdb.h>
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#include <memory>
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#include "lmdb/error.h"
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//! Uses C++ type system to differentiate between cursors
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#define MONERO_CURSOR(name) \
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struct close_ ## name : ::lmdb::close_cursor {}; \
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using name = std::unique_ptr< MDB_cursor, close_ ## name >;
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namespace lmdb
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{
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struct abort_txn
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{
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void operator()(MDB_txn* ptr) const noexcept
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{
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if (ptr)
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mdb_txn_abort(ptr);
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}
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};
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/*!
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Only valid if used via `create_read_txn()`. Decrements active count in
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associated `context`, and aborts a LMDB transaction (`mdb_txn_abort`).
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*/
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struct release_read_txn
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{
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void operator()(MDB_txn* ptr) const noexcept;
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// implementation in database.cpp
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};
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/*!
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Only valid if used via `create_write_txn()`. Decrements active count in
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associated `context`, and aborts a LMDB transaction (`mdb_txn_abort`).
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*/
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struct abort_write_txn
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{
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void operator()(MDB_txn* ptr) const noexcept
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{
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release_read_txn{}(ptr);
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}
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};
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struct close_cursor
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{
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void operator()(MDB_cursor* ptr) const noexcept
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{
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if (ptr)
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mdb_cursor_close(ptr);
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}
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};
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template<typename D>
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inline expect<std::unique_ptr<MDB_cursor, D>>
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open_cursor(MDB_txn& txn, MDB_dbi tbl) noexcept
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{
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MDB_cursor* cur = nullptr;
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MONERO_LMDB_CHECK(mdb_cursor_open(&txn, tbl, &cur));
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return std::unique_ptr<MDB_cursor, D>{cur};
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}
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// The below use the C++ type system to designate `MDB_txn` status.
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using suspended_txn = std::unique_ptr<MDB_txn, abort_txn>;
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using read_txn = std::unique_ptr<MDB_txn, release_read_txn>;
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using write_txn = std::unique_ptr<MDB_txn, abort_write_txn>;
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} // lmdb
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