e7fdadd748
Allow file_random_access_reader constructor to set the input stream to prepare for futurizing seek() by adding a protected set() method. Signed-off-by: Benny Halevy <bhalevy@scylladb.com>
78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
/*
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* Copyright (C) 2020 ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <exception>
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#include "sstables/random_access_reader.hh"
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#include "utils/disk-error-handler.hh"
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#include "log.hh"
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namespace sstables {
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extern logging::logger sstlog;
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future <temporary_buffer<char>> random_access_reader::read_exactly(size_t n) {
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return _in->read_exactly(n);
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}
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void random_access_reader::seek(uint64_t pos) {
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if (_in) {
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// Future is waited on indirectly in `close()` (via `_close_gate`).
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// FIXME: error handling
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(void)seastar::with_gate(_close_gate, [in = std::move(_in)]() mutable {
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auto fut = in->close();
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return fut.then([in = std::move(in)] {});
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});
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}
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set(open_at(pos));
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}
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future<> random_access_reader::close() {
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return _close_gate.close().then([this] {
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return _in->close();
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});
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}
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file_random_access_reader::file_random_access_reader(file f, uint64_t file_size, size_t buffer_size, unsigned read_ahead)
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: _file(std::move(f)), _file_size(file_size), _buffer_size(buffer_size), _read_ahead(read_ahead) {
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set(open_at(0));
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}
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input_stream<char> file_random_access_reader::open_at(uint64_t pos) {
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auto len = _file_size - pos;
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file_input_stream_options options;
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options.buffer_size = _buffer_size;
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options.read_ahead = _read_ahead;
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return make_file_input_stream(_file, pos, len, std::move(options));
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}
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future<> file_random_access_reader::close() {
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return random_access_reader::close().finally([this] {
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return _file.close().handle_exception([save = _file](auto ep) {
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sstlog.warn("sstable close failed: {}", ep);
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general_disk_error();
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});
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});
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}
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}
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