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//
// Created by root on 4/24/18.
//
#ifndef FEATHER_FEATHER_CFG_HPP
#define FEATHER_FEATHER_CFG_HPP
namespace feather{
struct feather_cfg{
int thread_num;
std::string port;
std::string db_ip;
std::string user_name;
std::string pwd;
std::string db_name;
int timeout;
int db_conn_num;
bool drop_all_table;
std::string log_path;
std::string log_name;
int roll_file_size;
};
REFLECTION(feather_cfg, thread_num, port, db_ip, user_name, pwd, db_name, timeout, db_conn_num,
drop_all_table, log_path, log_name, roll_file_size);
class config_manager {
public:
config_manager() = delete;
template<typename T>
inline static T get(std::string_view key, std::string_view file_path) {
feather_cfg cfg{};
bool r = from_file(cfg, file_path);
if (!r) {
return {};
}
T val{};
bool has_key = false;
iguana::for_each(cfg, [key, &val, &cfg, &has_key](const auto& item, auto I) {
if (key == iguana::get_name<feather_cfg>(decltype(I)::value)) {
assign(val, cfg.*item);
has_key = true;
}
});
if (!has_key) {
return {};
}
return val;
}
template<typename T>
inline static bool set(std::string_view key, T&& val, std::string_view file_path) {
feather_cfg cfg{};
bool r = from_file(cfg, file_path);
if (!r) {
return false;
}
bool has_key = false;
iguana::for_each(cfg, [key, &val, &cfg, &has_key](auto& item, auto I) {
if (key == iguana::get_name<feather_cfg>(decltype(I)::value)) {
assign(cfg.*item, val);
has_key = true;
}
});
if (!has_key)
return false;
return to_file(cfg, file_path);
}
template<typename T>
inline static bool from_file(T& t, std::string_view file_path) {
std::ifstream in(file_path.data(), std::ios::binary);
if (!in.is_open()) {
return false;
}
in.seekg(0, std::ios::end);
size_t len = (size_t)in.tellg();
in.seekg(0);
std::string str;
str.resize(len);
in.read(str.data(), len);
bool r = iguana::json::from_json(t, str.data(), len);
if (!r) {
return false;
}
return true;
}
template<typename T, typename U>
inline static void assign(T& t, U& u) {
if constexpr(std::is_same_v<U, T>) {
t = u;
}
}
template<typename T>
inline static bool to_file(T& t, std::string_view file_path) {
iguana::string_stream ss;
iguana::json::to_json(ss, t);
std::ofstream out(file_path.data(), std::ios::binary);
if (!out.is_open()) {
return false;
}
out.write(ss.str().data(), ss.str().size());
out.close();
return true;
}
};
}
#endif //FEATHER_FEATHER_CFG_HPP
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