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/*
* This file is open source software, licensed to you under the terms
* of the Apache License, Version 2.0 (the "License"). See the NOTICE file
* distributed with this work for additional information regarding copyright
* ownership. You may not use this file except in compliance with the License.
*
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
/*
* Copyright (C) 2017 ScyllaDB Ltd.
*/
#pragma once
#include <boost/range/numeric.hpp>
#include <seastar/testing/seastar_test.hh>
#include <seastar/core/file.hh>
namespace seastar {
class mock_read_only_file final : public file_impl {
bool _closed = false;
uint64_t _total_file_size;
size_t _allowed_read_requests = 0;
std::function<void(size_t)> _verify_length;
private:
size_t verify_read(uint64_t position, size_t length) {
BOOST_CHECK(!_closed);
BOOST_CHECK_LE(position, _total_file_size);
BOOST_CHECK_LE(position + length, _total_file_size);
if (position + length != _total_file_size) {
_verify_length(length);
}
BOOST_CHECK(_allowed_read_requests);
assert(_allowed_read_requests);
_allowed_read_requests--;
return length;
}
public:
explicit mock_read_only_file(uint64_t file_size) noexcept
: _total_file_size(file_size)
, _verify_length([] (auto) { })
{ }
void set_read_size_verifier(std::function<void(size_t)> fn) {
_verify_length = fn;
}
void set_expected_read_size(size_t expected) {
_verify_length = [expected] (auto length) {
BOOST_CHECK_EQUAL(length, expected);
};
}
void set_allowed_read_requests(size_t requests) {
_allowed_read_requests = requests;
}
virtual future<size_t> write_dma(uint64_t, const void*, size_t, const io_priority_class&) override {
throw std::bad_function_call();
}
virtual future<size_t> write_dma(uint64_t, std::vector<iovec>, const io_priority_class&) override {
throw std::bad_function_call();
}
virtual future<size_t> read_dma(uint64_t pos, void*, size_t len, const io_priority_class&) override {
return make_ready_future<size_t>(verify_read(pos, len));
}
virtual future<size_t> read_dma(uint64_t pos, std::vector<iovec> iov, const io_priority_class&) override {
auto length = boost::accumulate(iov | boost::adaptors::transformed([] (auto&& iov) { return iov.iov_len; }),
size_t(0), std::plus<size_t>());
return make_ready_future<size_t>(verify_read(pos, length));
}
virtual future<> flush() override {
return make_ready_future<>();
}
virtual future<struct stat> stat() override {
throw std::bad_function_call();
}
virtual future<> truncate(uint64_t) {
throw std::bad_function_call();
}
virtual future<> discard(uint64_t offset, uint64_t length) override {
throw std::bad_function_call();
}
virtual future<> allocate(uint64_t position, uint64_t length) override {
throw std::bad_function_call();
}
virtual future<uint64_t> size() override {
return make_ready_future<uint64_t>(_total_file_size);
}
virtual future<> close() override {
BOOST_CHECK(!_closed);
_closed = true;
return make_ready_future<>();
}
virtual subscription<directory_entry> list_directory(std::function<future<> (directory_entry de)>) override {
throw std::bad_function_call();
}
virtual future<temporary_buffer<uint8_t>> dma_read_bulk(uint64_t offset, size_t range_size, const io_priority_class&) override {
auto length = verify_read(offset, range_size);
return make_ready_future<temporary_buffer<uint8_t>>(temporary_buffer<uint8_t>(length));
}
};
}
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