fcb8d040e8
Instead of lengthy blurbs, switch to single-line, machine-readable standardized (https://spdx.dev) license identifiers. The Linux kernel switched long ago, so there is strong precedent. Three cases are handled: AGPL-only, Apache-only, and dual licensed. For the latter case, I chose (AGPL-3.0-or-later and Apache-2.0), reasoning that our changes are extensive enough to apply our license. The changes we applied mechanically with a script, except to licenses/README.md. Closes #9937
114 lines
3.2 KiB
C++
114 lines
3.2 KiB
C++
/*
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* Copyright (C) 2018-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#include "utils/limiting_data_source.hh"
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#include <boost/test/unit_test.hpp>
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#include <seastar/testing/test_case.hh>
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#include <seastar/testing/thread_test_case.hh>
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#include <seastar/core/iostream.hh>
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#include <seastar/core/temporary_buffer.hh>
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#include <seastar/core/thread.hh>
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#include <cstdint>
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using namespace seastar;
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namespace {
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class test_data_source_impl : public data_source_impl {
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char _cur = 0;
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void advance(uint64_t n) {
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_cur = (_cur + n) % (std::numeric_limits<char>::max() + 1);
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}
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public:
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static const unsigned chunk_limit = 10;
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test_data_source_impl() { }
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test_data_source_impl(test_data_source_impl&&) noexcept = default;
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test_data_source_impl& operator=(test_data_source_impl&&) noexcept = default;
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virtual future<temporary_buffer<char>> get() override {
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temporary_buffer<char> res(chunk_limit);
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for (unsigned i = 0; i < chunk_limit; ++i) {
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res.get_write()[i] = _cur;
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advance(1);
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}
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return make_ready_future<temporary_buffer<char>>(std::move(res));
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}
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virtual future<temporary_buffer<char>> skip(uint64_t n) override {
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advance(n);
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return get();
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}
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};
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data_source create_test_data_source() {
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return data_source{std::make_unique<test_data_source_impl>()};
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}
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void test_get(unsigned limit) {
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auto src = create_test_data_source();
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auto tested = make_limiting_data_source(std::move(src), [limit] { return limit; });
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char expected = 0;
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auto test_get = [&] {
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auto buf = tested.get().get0();
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BOOST_REQUIRE(buf.size() <= limit);
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for (unsigned i = 0; i < buf.size(); ++i) {
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BOOST_REQUIRE_EQUAL(expected++, buf[i]);
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}
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};
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test_get();
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test_get();
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test_get();
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}
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data_source prepare_test_skip() {
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auto src = create_test_data_source();
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auto tested = make_limiting_data_source(std::move(src), [] { return 1; });
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auto buf = tested.get().get0();
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BOOST_REQUIRE_EQUAL(1, buf.size());
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BOOST_REQUIRE_EQUAL(0, buf[0]);
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// At this point we have 9 chars buffered in limiting_data_source_impl
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return tested;
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}
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}
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SEASTAR_THREAD_TEST_CASE(test_get_smaller_than_limit) {
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assert(test_data_source_impl::chunk_limit > 1);
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test_get(test_data_source_impl::chunk_limit - 1);
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}
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SEASTAR_THREAD_TEST_CASE(test_get_equal_to_limit) {
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test_get(test_data_source_impl::chunk_limit);
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}
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SEASTAR_THREAD_TEST_CASE(test_get_smaller_bigger_than_limit) {
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test_get(test_data_source_impl::chunk_limit + 1);
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}
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SEASTAR_THREAD_TEST_CASE(test_skip_smaller_than_buffered_data) {
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auto tested = prepare_test_skip();
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auto buf = tested.skip(8).get0();
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BOOST_REQUIRE_EQUAL(1, buf.size());
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BOOST_REQUIRE_EQUAL(9, buf[0]);
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}
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SEASTAR_THREAD_TEST_CASE(test_skip_equal_to_buffered_data) {
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auto tested = prepare_test_skip();
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auto buf = tested.skip(9).get0();
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BOOST_REQUIRE_EQUAL(1, buf.size());
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BOOST_REQUIRE_EQUAL(10, buf[0]);
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}
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SEASTAR_THREAD_TEST_CASE(test_skip_bigger_than_buffered_data) {
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auto tested = prepare_test_skip();
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auto buf = tested.skip(10).get0();
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BOOST_REQUIRE_EQUAL(1, buf.size());
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BOOST_REQUIRE_EQUAL(11, buf[0]);
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}
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