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// Copyright 2025 Huawei Cloud Computing Technology Co., Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// 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.
#include "src/utils/cpp/incremental_reader.hpp"
#include <cstddef>
#include <cstdint>
#include <filesystem>
#include <fstream>
#include <memory>
#include <optional>
#include <string>
#include <string_view>
#include "catch2/catch_test_macros.hpp"
#include "src/buildtool/storage/config.hpp"
#include "src/utils/cpp/expected.hpp"
#include "src/utils/cpp/tmp_dir.hpp"
#include "test/utils/hermeticity/test_storage_config.hpp"
#include "test/utils/large_objects/large_object_utils.hpp"
[[nodiscard]] static auto ReadFile(std::filesystem::path const& path) noexcept
-> std::optional<std::string> {
try {
std::size_t const file_size = std::filesystem::file_size(path);
std::string result(file_size, '\0');
std::ifstream istream(path.string(), std::ios_base::binary);
if (not istream.good()) {
return std::nullopt;
}
istream.read(result.data(), static_cast<std::streamsize>(file_size));
return result;
} catch (...) {
return std::nullopt;
}
}
TEST_CASE("IncrementalReader", "[incremental_reader]") {
static constexpr auto kFileSize =
static_cast<std::uintmax_t>(5 * 1024 * 1024);
static constexpr std::size_t kChunkWithRemainder = 107;
static_assert(kFileSize % kChunkWithRemainder != 0);
static constexpr std::size_t kChunkWithoutRemainder = 128;
static_assert(kFileSize % kChunkWithoutRemainder == 0);
auto const config = TestStorageConfig::Create();
auto temp_dir = config.Get().CreateTypedTmpDir("incremental_reader");
REQUIRE(temp_dir);
auto const file_path = temp_dir->GetPath() / "file";
REQUIRE(LargeObjectUtils::GenerateFile(file_path, kFileSize));
auto const file_content = ::ReadFile(file_path);
REQUIRE(file_content.has_value());
SECTION("File") {
auto reader =
IncrementalReader::FromFile(kChunkWithRemainder, file_path);
REQUIRE(reader.has_value());
std::string result;
result.reserve(reader->GetContentSize());
for (auto chunk : *reader) {
REQUIRE(chunk.has_value());
result.append(*chunk);
}
REQUIRE(result.size() == file_content->size());
REQUIRE(result == *file_content);
reader = IncrementalReader::FromFile(kChunkWithoutRemainder, file_path);
REQUIRE(reader.has_value());
result.clear();
for (auto chunk : *reader) {
REQUIRE(chunk.has_value());
result.append(*chunk);
}
REQUIRE(result.size() == file_content->size());
REQUIRE(result == *file_content);
}
SECTION("Memory") {
auto reader =
IncrementalReader::FromMemory(kChunkWithRemainder, &*file_content);
REQUIRE(reader.has_value());
std::string result;
result.reserve(reader->GetContentSize());
for (auto chunk : *reader) {
REQUIRE(chunk.has_value());
result.append(*chunk);
}
REQUIRE(result.size() == file_content->size());
REQUIRE(result == *file_content);
reader = IncrementalReader::FromMemory(kChunkWithoutRemainder,
&*file_content);
REQUIRE(reader.has_value());
result.clear();
for (auto chunk : *reader) {
REQUIRE(chunk.has_value());
result.append(*chunk);
}
REQUIRE(result.size() == file_content->size());
REQUIRE(result == *file_content);
}
}
TEST_CASE("IncrementalReader - Empty", "[incremental_reader]") {
static constexpr std::size_t kChunkSize = 128;
SECTION("File") {
auto const config = TestStorageConfig::Create();
auto temp_dir = config.Get().CreateTypedTmpDir("incremental_reader");
REQUIRE(temp_dir);
std::filesystem::path const empty_file = temp_dir->GetPath() / "file";
{
std::ofstream stream(empty_file);
stream << "";
}
auto const reader = IncrementalReader::FromFile(kChunkSize, empty_file);
REQUIRE(reader.has_value());
std::optional<std::string> result;
for (auto chunk : *reader) {
REQUIRE(chunk.has_value());
if (not result.has_value()) {
result = std::string{};
}
result->append(*chunk);
}
REQUIRE(result.has_value());
REQUIRE(result->empty());
}
SECTION("Memory") {
std::string const empty;
auto const reader = IncrementalReader::FromMemory(kChunkSize, &empty);
REQUIRE(reader.has_value());
std::optional<std::string> result;
for (auto chunk : *reader) {
REQUIRE(chunk.has_value());
if (not result.has_value()) {
result = std::string{};
}
result->append(*chunk);
}
REQUIRE(result.has_value());
REQUIRE(result->empty());
}
}
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