#pragma once
#include <cstdio>
#include <string>
#include <mutex>

class OrderLog {
public:
    void open(const std::string& path);
    void close();
    void log_order(const std::string& order_json, const std::string& external_id = "");
private:
    FILE* fp_ = nullptr;
    std::mutex mutex_;
    int sequence_ = 0;
};

extern OrderLog g_order_log;