CPP_Core/Core/system/export.h

#pragma once

#include "../Base/global_include.h"
#include "magic_enum/../../../export.h"

#include <algorithm>
#include <atomic>
#include <cassert>
#include <csignal>
#include <cstdint>
#include <ctime>
#include <deque>
#include <functional>
#include <iostream>
#include <mutex>
#include <set>
#include <stack>
#include <string>
#include <system_error>
#include <thread>
#include <utility>
#include <vector>

#define PSC_LOAD_LIBRARY_PARAMS(M, SEP) \
    M(const std::string&, library_path)

#define PSC_LOAD_FUNCTION_PARAMS(M, SEP) \
    M(void*, library) SEP()              \
    M(const std::string&, function_name)

#define DELETE_COPY(Class)                         \
    Class(const Class&) = delete;                  \
    Class& operator=(const Class&) = delete;

namespace Psc {
    void set_console_utf8();

    std::string get_stack_trace();
    std::string get_computer_serial_number();

    PSC_DECLARE_TRIPLE_API(void*, load_library, PSC_LOAD_LIBRARY_PARAMS);
    void* load_library_fail_fast(const std::string& library_path);

    void free_library(void* library);

    PSC_DECLARE_TRIPLE_API(void*, load_function, PSC_LOAD_FUNCTION_PARAMS);
    void* load_function_fail_fast(void* library, const std::string& function_name);

    std::string get_home_dir();
    std::string get_exe_path();
    std::string get_exe_dir();

    std::string get_abs_path(const std::string& path);
    std::string to_upper_case(const std::string& input);
    std::string base64_encode(const std::string& data);
    std::string base64_decode(const std::string& data);

    // strftime 格式，例如 "%Y-%m-%d %H:%M:%S" / "%H:%M:%S"。
    std::string utc_2_local_time(std::time_t us_timestamp, const char* format = "%H:%M:%S");

    std::uint64_t get_current_millisecond_timestamp();
    void set_current_thread_name(const std::string& name);

    using Main_Function_Type = int (*)(int, char**);

    // 接管 main 函数，联通 gtest。
    int redict_main_with_gtest(int argc, char* argv[], Main_Function_Type main_func);

    // 设置给定 std::thread 的优先级。
    // Windows: void* 版本要求传 Win32 HANDLE。
    // Linux:   void* 版本要求传 pthread_t*，例如 pthread_t pt = pthread_self(); set_thread_priority(&pt, ...)。
    bool set_thread_priority(void* thread, int priority, bool realtime);
    bool set_thread_priority(std::thread* thread, int priority, bool realtime);

    // 设置给定线程的 CPU 亲和性。
    // Windows: void* 版本要求传 Win32 HANDLE。
    // Linux:   void* 版本要求传 pthread_t*。
    bool set_thread_affinity(void* thread, unsigned cpu_index);
    bool set_thread_affinity(std::thread* thread, unsigned cpu_index);

    size_t get_system_memory();
    size_t get_process_memory();
    std::string get_memory_info();

    std::string signal_to_string(int signal);
    std::string get_current_time_as_string();
    void create_file_if_not_exists(const std::string& file_name);
    void create_dir_if_not_exists(const std::string& dir_name);

    void init_signal_config(std::set<int> normal_quit = {SIGINT, SIGTERM}, std::set<int> ignore_signal = {});

    class String_Pool {
    public:
        explicit String_Pool(size_t block_size, size_t pool_size)
            : block_size(block_size), pool_size(pool_size) {
            grow(pool_size);
        }

        size_t remain_size() {
            std::lock_guard g(mtx);
            return strings_.size() * block_size;
        }

        size_t free_size() {
            std::lock_guard g(mtx);
            return free_.size() * block_size;
        }

        std::string* get() {
            std::lock_guard g(mtx);

            if (free_.empty()) {
                const size_t grow_count = strings_.empty() ? std::max<size_t>(pool_size, 1) : strings_.size();

                std::cout << "String_Pool 扩容对象数 【" << grow_count
                          << "】，理论容量 【" << grow_count * block_size << "】"
                          << std::endl;

                grow(grow_count);
            }

            std::string* ptr = free_.top();
            free_.pop();
            return ptr;
        }

        [[nodiscard]] size_t capacity() const {
            std::lock_guard g(mtx);
            return strings_.size();
        }

        [[nodiscard]] size_t free_count() const {
            std::lock_guard g(mtx);
            return free_.size();
        }

    private:
        void grow(size_t count) {
            for (size_t i = 0; i < count; ++i) {
                strings_.emplace_back();
                std::string& str = strings_.back();
                str.reserve(block_size);
                free_.push(&str);
            }
        }

        void release(std::string* ptr) {
            std::lock_guard g(mtx);
            if (ptr) {
                ptr->clear();
                free_.push(ptr);
            }
        }

        void release(const std::vector<std::string*>& list) {
            std::lock_guard g(mtx);
            for (auto* li : list) {
                if (li) {
                    li->clear();
                    free_.push(li);
                }
            }
        }

    private:
        std::deque<std::string> strings_;
        std::stack<std::string*> free_{};

        mutable Spin_Lock mtx;

        size_t block_size; // 每个 std::string 预留的容量。
        size_t pool_size;  // 初始创建多少个 string 对象。

        friend struct Pool_Guard;
    };

    struct Pool_Guard {
        Pool_Guard(String_Pool* pool, std::string* buf)
            : pool(pool), buf(buf) {}

        Pool_Guard(String_Pool* pool, std::vector<std::string*> list)
            : pool(pool), list(std::move(list)) {}

        ~Pool_Guard() {
            if (!pool) {
                return;
            }

            if (buf) {
                pool->release(buf);
            }

            if (!list.empty()) {
                pool->release(list);
            }
        }

        Pool_Guard(const Pool_Guard&) = delete;
        Pool_Guard& operator=(const Pool_Guard&) = delete;

        Pool_Guard(Pool_Guard&& other) noexcept
            : pool(other.pool),
              list(std::move(other.list)),
              buf(other.buf) {
            other.pool = nullptr;
            other.buf = nullptr;
        }

        Pool_Guard& operator=(Pool_Guard&& other) noexcept {
            if (this != &other) {
                pool = other.pool;
                list = std::move(other.list);
                buf = other.buf;

                other.pool = nullptr;
                other.buf = nullptr;
            }

            return *this;
        }

    protected:
        String_Pool* pool{};
        std::vector<std::string*> list;
        std::string* buf{};
    };

    template <typename Enum_Type>
    class Enum_Err {
    public:
        explicit Enum_Err(Enum_Type errc)
            : nerr(errc),
              native(get_error_code(), std::system_category()) {}

        Enum_Err(Enum_Type errc, ERROR_CODE_TYPE code)
            : nerr(errc),
              native(std::error_code(code, std::system_category())) {}

        Enum_Type nerr;
        std::error_code native;

        std::string to_string() {
            auto enum_name = std::string(magic_enum::enum_type_name<Enum_Type>());
            return enum_name + "【" + Psc::to_string(nerr) + "  native:" + get_error_message(native.value()) + "】";
        }
    };

} // namespace Psc