【日志库】spdlog的格式设置

小鱼儿 2022-12-15 03:55 301阅读 0赞

SPDLOG_INLINE void pattern_formatter::handle_flag_(char flag, details::padding_info padding)
    {
        // process custom flags
        auto it = custom_handlers_.find(flag);
        if (it != custom_handlers_.end())
        {
            auto custom_handler = it->second->clone();
            custom_handler->set_padding_info(padding);
            formatters_.push_back(std::move(custom_handler));
            return;
        }
    
        // process built-in flags
        switch (flag)
        {
        case ('+'): // default formatter
            formatters_.push_back(details::make_unique<details::full_formatter>(padding));
            break;
    
        case 'n': // logger name
            formatters_.push_back(details::make_unique<details::name_formatter<Padder>>(padding));
            break;
    
        case 'l': // level
            formatters_.push_back(details::make_unique<details::level_formatter<Padder>>(padding));
            break;
    
        case 'L': // short level
            formatters_.push_back(details::make_unique<details::short_level_formatter<Padder>>(padding));
            break;
    
        case ('t'): // thread id
            formatters_.push_back(details::make_unique<details::t_formatter<Padder>>(padding));
            break;
    
        case ('v'): // the message text
            formatters_.push_back(details::make_unique<details::v_formatter<Padder>>(padding));
            break;
    
        case ('a'): // weekday
            formatters_.push_back(details::make_unique<details::a_formatter<Padder>>(padding));
            break;
    
        case ('A'): // short weekday
            formatters_.push_back(details::make_unique<details::A_formatter<Padder>>(padding));
            break;
    
        case ('b'):
        case ('h'): // month
            formatters_.push_back(details::make_unique<details::b_formatter<Padder>>(padding));
            break;
    
        case ('B'): // short month
            formatters_.push_back(details::make_unique<details::B_formatter<Padder>>(padding));
            break;
    
        case ('c'): // datetime
            formatters_.push_back(details::make_unique<details::c_formatter<Padder>>(padding));
            break;
    
        case ('C'): // year 2 digits
            formatters_.push_back(details::make_unique<details::C_formatter<Padder>>(padding));
            break;
    
        case ('Y'): // year 4 digits
            formatters_.push_back(details::make_unique<details::Y_formatter<Padder>>(padding));
            break;
    
        case ('D'):
        case ('x'): // datetime MM/DD/YY
            formatters_.push_back(details::make_unique<details::D_formatter<Padder>>(padding));
            break;
    
        case ('m'): // month 1-12
            formatters_.push_back(details::make_unique<details::m_formatter<Padder>>(padding));
            break;
    
        case ('d'): // day of month 1-31
            formatters_.push_back(details::make_unique<details::d_formatter<Padder>>(padding));
            break;
    
        case ('H'): // hours 24
            formatters_.push_back(details::make_unique<details::H_formatter<Padder>>(padding));
            break;
    
        case ('I'): // hours 12
            formatters_.push_back(details::make_unique<details::I_formatter<Padder>>(padding));
            break;
    
        case ('M'): // minutes
            formatters_.push_back(details::make_unique<details::M_formatter<Padder>>(padding));
            break;
    
        case ('S'): // seconds
            formatters_.push_back(details::make_unique<details::S_formatter<Padder>>(padding));
            break;
    
        case ('e'): // milliseconds
            formatters_.push_back(details::make_unique<details::e_formatter<Padder>>(padding));
            break;
    
        case ('f'): // microseconds
            formatters_.push_back(details::make_unique<details::f_formatter<Padder>>(padding));
            break;
    
        case ('F'): // nanoseconds
            formatters_.push_back(details::make_unique<details::F_formatter<Padder>>(padding));
            break;
    
        case ('E'): // seconds since epoch
            formatters_.push_back(details::make_unique<details::E_formatter<Padder>>(padding));
            break;
    
        case ('p'): // am/pm
            formatters_.push_back(details::make_unique<details::p_formatter<Padder>>(padding));
            break;
    
        case ('r'): // 12 hour clock 02:55:02 pm
            formatters_.push_back(details::make_unique<details::r_formatter<Padder>>(padding));
            break;
    
        case ('R'): // 24-hour HH:MM time
            formatters_.push_back(details::make_unique<details::R_formatter<Padder>>(padding));
            break;
    
        case ('T'):
        case ('X'): // ISO 8601 time format (HH:MM:SS)
            formatters_.push_back(details::make_unique<details::T_formatter<Padder>>(padding));
            break;
    
        case ('z'): // timezone
            formatters_.push_back(details::make_unique<details::z_formatter<Padder>>(padding));
            break;
    
        case ('P'): // pid
            formatters_.push_back(details::make_unique<details::pid_formatter<Padder>>(padding));
            break;
    
        case ('^'): // color range start
            formatters_.push_back(details::make_unique<details::color_start_formatter>(padding));
            break;
    
        case ('$'): // color range end
            formatters_.push_back(details::make_unique<details::color_stop_formatter>(padding));
            break;
    
        case ('@'): // source location (filename:filenumber)
            formatters_.push_back(details::make_unique<details::source_location_formatter<Padder>>(padding));
            break;
    
        case ('s'): // short source filename - without directory name
            formatters_.push_back(details::make_unique<details::short_filename_formatter<Padder>>(padding));
            break;
    
        case ('g'): // full source filename
            formatters_.push_back(details::make_unique<details::source_filename_formatter<Padder>>(padding));
            break;
    
        case ('#'): // source line number
            formatters_.push_back(details::make_unique<details::source_linenum_formatter<Padder>>(padding));
            break;
    
        case ('!'): // source funcname
            formatters_.push_back(details::make_unique<details::source_funcname_formatter<Padder>>(padding));
            break;
    
        case ('%'): // % char
            formatters_.push_back(details::make_unique<details::ch_formatter>('%'));
            break;
    
        case ('u'): // elapsed time since last log message in nanos
            formatters_.push_back(details::make_unique<details::elapsed_formatter<Padder, std::chrono::nanoseconds>>(padding));
            break;
    
        case ('i'): // elapsed time since last log message in micros
            formatters_.push_back(details::make_unique<details::elapsed_formatter<Padder, std::chrono::microseconds>>(padding));
            break;
    
        case ('o'): // elapsed time since last log message in millis
            formatters_.push_back(details::make_unique<details::elapsed_formatter<Padder, std::chrono::milliseconds>>(padding));
            break;
    
        case ('O'): // elapsed time since last log message in seconds
            formatters_.push_back(details::make_unique<details::elapsed_formatter<Padder, std::chrono::seconds>>(padding));
            break;
    
        default: // Unknown flag appears as is
            auto unknown_flag = details::make_unique<details::aggregate_formatter>();
    
            if (!padding.truncate_)
            {
                unknown_flag->add_ch('%');
                unknown_flag->add_ch(flag);
                formatters_.push_back((std::move(unknown_flag)));
            }
            // fix issue #1617 (prev char was '!' and should have been treated as funcname flag instead of truncating flag)
            // spdlog::set_pattern("[%10!] %v") => "[      main] some message"
            // spdlog::set_pattern("[%3!!] %v") => "[mai] some message"
            else
            {
                padding.truncate_ = false;
                formatters_.push_back(details::make_unique<details::source_funcname_formatter<Padder>>(padding));
                unknown_flag->add_ch(flag);
                formatters_.push_back((std::move(unknown_flag)));
            }
    
            break;
        }
    }

**线程ID的获取**

// Return current thread id as size_t
    // It exists because the std::this_thread::get_id() is much slower(especially
    // under VS 2013)
    SPDLOG_INLINE size_t _thread_id() SPDLOG_NOEXCEPT
    {
    #ifdef _WIN32
        return static_cast<size_t>(::GetCurrentThreadId());
    #elif defined(__linux__)
    #if defined(__ANDROID__) && defined(__ANDROID_API__) && (__ANDROID_API__ < 21)
    #define SYS_gettid __NR_gettid
    #endif
        return static_cast<size_t>(::syscall(SYS_gettid));
    #elif defined(_AIX) || defined(__DragonFly__) || defined(__FreeBSD__)
        return static_cast<size_t>(::pthread_getthreadid_np());
    #elif defined(__NetBSD__)
        return static_cast<size_t>(::_lwp_self());
    #elif defined(__OpenBSD__)
        return static_cast<size_t>(::getthrid());
    #elif defined(__sun)
        return static_cast<size_t>(::thr_self());
    #elif __APPLE__
        uint64_t tid;
        pthread_threadid_np(nullptr, &tid);
        return static_cast<size_t>(tid);
    #else // Default to standard C++11 (other Unix)
        return static_cast<size_t>(std::hash<std::thread::id>()(std::this_thread::get_id()));
    #endif
    }