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Faset_Engine/tests/build_cache_tests.cpp
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#include <faset/core/io.hpp>
#include <faset/editor/build_cache.hpp>
#include <faset/editor/build_service.hpp>
#include <faset/scripting/project.hpp>
#include <iostream>
using namespace faset;
namespace fs = std::filesystem;
namespace {
void check(bool condition, std::string_view message) {
if (!condition)
throw std::runtime_error(std::string(message));
}
void run(const fs::path& root) {
const auto project = root / "project";
const auto scripts = project / "Scripts";
atomic_write(scripts / "Gameplay.cpp", "#include \"Gameplay.hpp\"\n");
atomic_write(scripts / "Gameplay.hpp", "#pragma once\n");
atomic_write(scripts / "Extensions/Extra.hpp", "#define SPEED 1\n");
const auto compiler = root / "fake-compiler";
const auto cmake = root / "fake-cmake";
const auto slang = root / "fake-slangc";
atomic_write(compiler, "compiler-v1\n");
atomic_write(cmake, "cmake-v1\n");
atomic_write(slang, "slang-v1\n");
editor::BuildConfig config;
config.project_root = project;
config.engine_root = path_from_utf8(FASET_ENGINE_SOURCE);
config.build_directory = project / ".faset/build";
config.cmake = path_to_utf8(cmake);
config.configure_arguments = {
"-DCMAKE_C_COMPILER=" + path_to_utf8(compiler),
"-DCMAKE_CXX_COMPILER=" + path_to_utf8(compiler),
"-DSLANGC_EXECUTABLE=" + path_to_utf8(slang)};
const scripting::LuaProject none;
const auto initial = editor::capture_build_inputs(config, none);
atomic_write(scripts / "Extensions/Extra.hpp", "#define SPEED 2\n");
const auto changed_header = editor::capture_build_inputs(config, none);
check(initial.source_hash != changed_header.source_hash &&
initial.fingerprint() != changed_header.fingerprint(),
"Nested gameplay header changes the complete source snapshot");
atomic_write(scripts / "main.lua", "return {}\n");
atomic_write_json(project / "project.faset.json",
{{"format", "faset.project"},
{"version", 1},
{"scripting", {{"lua", {{"scripts", {"Scripts/main.lua"}}}}}}});
auto lua = scripting::loadLuaProject(project);
const auto with_lua = editor::capture_build_inputs(config, lua);
atomic_write(scripts / "other.lua", "return {}\n");
auto manifest = read_json(project / "project.faset.json");
manifest["scripting"]["lua"]["scripts"].push_back("Scripts/other.lua");
atomic_write_json(project / "project.faset.json", manifest);
lua = scripting::loadLuaProject(project);
const auto changed_declaration = editor::capture_build_inputs(config, lua);
check(with_lua.source_hash != changed_declaration.source_hash,
"Lua entry declaration changes the source snapshot");
const auto native = config.build_directory / "Debug";
editor::ensure_native_toolchain_stamp(config, native, changed_declaration);
atomic_write(native / "sentinel", "keep\n");
editor::ensure_native_toolchain_stamp(config, native, changed_declaration);
check(fs::exists(native / "sentinel"), "Unchanged toolchain preserves the native tree");
atomic_write(compiler, "compiler-v2\n");
const auto changed_tool = editor::capture_build_inputs(config, lua);
check(changed_tool.source_hash == changed_declaration.source_hash &&
changed_tool.toolchain_hash != changed_declaration.toolchain_hash,
"Changing compiler bytes at the same path changes toolchain identity");
editor::ensure_native_toolchain_stamp(config, native, changed_tool);
check(!fs::exists(native / "sentinel"),
"Changed toolchain invalidates only the generated native tree");
const auto user_directory = root / "important-user-data";
atomic_write(user_directory / "do-not-delete.txt", "valuable\n");
bool refused_unowned{};
try {
editor::ensure_native_toolchain_stamp(config, user_directory, changed_tool);
} catch (const std::exception&) {
refused_unowned = true;
}
check(refused_unowned && fs::is_regular_file(user_directory / "do-not-delete.txt"),
"Unowned native directory is never cleared");
std::error_code native_link_error;
fs::create_directory_symlink(user_directory, config.build_directory / "Release",
native_link_error);
if (!native_link_error) {
bool refused_link{};
try {
editor::ensure_native_toolchain_stamp(config, config.build_directory / "Release",
changed_tool);
} catch (const std::exception&) {
refused_link = true;
}
check(refused_link && fs::is_regular_file(user_directory / "do-not-delete.txt"),
"Symlinked native directory cannot redirect cleanup into user data");
}
const auto relative_tool = project / "tools/cmake-fixture";
atomic_write(relative_tool, "relative-cmake-v1\n");
auto relative_config = config;
relative_config.cmake = "tools/cmake-fixture";
const auto relative_before = editor::capture_build_inputs(relative_config, lua);
atomic_write(relative_tool, "relative-cmake-v2\n");
check(relative_before.toolchain_hash !=
editor::capture_build_inputs(relative_config, lua).toolchain_hash,
"Relative CMake executable resolves from the project working directory");
auto typed_config = config;
const auto typed_compiler = root / "typed-compiler";
atomic_write(typed_compiler, "typed-v1\n");
typed_config.configure_arguments = {
"-DCMAKE_C_COMPILER:FILEPATH=" + path_to_utf8(typed_compiler)};
const auto typed_before = editor::capture_build_inputs(typed_config, lua);
atomic_write(typed_compiler, "typed-v2\n");
check(typed_before.toolchain_hash !=
editor::capture_build_inputs(typed_config, lua).toolchain_hash,
"Typed CMake compiler overrides are included in toolchain identity");
auto malicious_config = config;
malicious_config.configure_arguments.push_back(
"-DFASET_GAMEPLAY_SOURCE_DIR:PATH=" + path_to_utf8(root / "outside"));
bool refused_source_override{};
try {
(void)editor::capture_build_inputs(malicious_config, lua);
} catch (const std::exception&) {
refused_source_override = true;
}
check(refused_source_override,
"Configure arguments cannot redirect gameplay compilation away from hashed Scripts");
const auto staged = editor::stage_gameplay_sources(config, changed_tool, lua,
"snapshot-fixture");
check(staged != scripts && fs::is_regular_file(staged / "Gameplay.cpp") &&
read_text(staged / "Extensions/Extra.hpp") == "#define SPEED 2\n",
"Native gameplay compilation uses a complete staged Scripts snapshot");
atomic_write(scripts / "Extensions/Extra.hpp", "#define SPEED 999\n");
check(read_text(staged / "Extensions/Extra.hpp") == "#define SPEED 2\n",
"A live edit cannot alter the source bytes of an in-flight native build");
atomic_write(scripts / "Extensions/Extra.hpp", "#define SPEED 2\n");
check(editor::stage_gameplay_sources(config, changed_tool, lua, "snapshot-again") ==
staged,
"Identical sources retain a stable native path for incremental Ninja builds");
atomic_write(native / "faset_player", "player-v1\n");
atomic_write(native / "faset_schema_exporter", "exporter-v1\n");
atomic_write(native / "CMakeCache.txt", "recipe-v1\n");
atomic_write(native / "shaders/vertexMain.spv", "shader-v1\n");
atomic_write(native / "faset_runtime.dll", "runtime-v1\n");
auto package_key = [&] (const editor::BuildInputs& inputs) {
return editor::build_package_key(inputs, native, "Debug", native / "faset_player",
native / "faset_schema_exporter");
};
const auto first_key = package_key(changed_tool);
check(first_key != package_key(changed_declaration) &&
first_key != package_key(with_lua),
"Toolchain and Lua source changes invalidate package identity");
auto option_config = config;
option_config.configure_arguments.push_back("-DFASET_TEST_OPTION=ON");
check(first_key != package_key(editor::capture_build_inputs(option_config, lua)),
"Configure option changes invalidate package identity");
atomic_write(native / "shaders/vertexMain.spv", "shader-v2\n");
check(first_key != package_key(changed_tool),
"Shader bytes invalidate package identity");
atomic_write(native / "shaders/vertexMain.spv", "shader-v1\n");
atomic_write(native / "faset_runtime.dll", "runtime-v2\n");
check(first_key != package_key(changed_tool),
"Runtime DLL bytes invalidate package identity");
fs::create_directories(root / "outside");
std::error_code link_error;
fs::create_directory_symlink(root / "outside", scripts / "linked", link_error);
if (!link_error) {
bool rejected = false;
try {
(void)editor::capture_build_inputs(config, lua);
} catch (const std::exception&) {
rejected = true;
}
check(rejected, "Source snapshot refuses a symlink escaping Scripts");
}
}
} // namespace
int main() {
const auto root = fs::temp_directory_path() / path_from_utf8("Faset build cache Café 世界 " + new_id());
try {
run(root);
fs::remove_all(root);
std::cout << "Source, toolchain and native package identity contracts passed\n";
return 0;
} catch (const std::exception& error) {
std::cerr << error.what() << '\n';
fs::remove_all(root);
return 1;
}
}