boost.log要点笔记

logging::add_file_log
(   
        keywords::file_name="sample_%N.log",        //文件名格式
        keywords::rotation_size=10*1024*1024,       //超过此大小自动建立新文件
        keywords::time_based_rotation=sinks::file::rotation_at_time_point(0,0,0),   //每隔指定时间重建新文件
        keywords::format="[%TimeStamp%]:%Message%"      //日志消息格式
);

sink->locked_backend()->set_file_collector(sinks::file::make_collector(
        keywords::target="logs",                //目标文件夹
        keywords::max_size=16*1024*1024,        //所有日志加起来的最大大小,
        keywords::min_free_space=100*1024*1024  //最低磁盘空间限制
        ));

logging::record rec=log.open_record();
if(rec)
{
        logging::record_ostream strm(rec);
        strm<<"Hello,World!";
        strm.flush();
        lg.push_record(boost::move(rec));
}

/*
 *  FILE: boost.log.init.hpp
 *  INSTRUCTION: 这个文件用于初始化boost.log
 *  DETAIL: 这里重新定义了日志级别和对应的文本内容. 
 *          文件大小限制等信息被硬编码在cpp文件中，如有需求可以修改。
 */
#ifndef BOOST_LOG_INIT_TAIRAN_HPP
#define BOOST_LOG_INIT_TAIRAN_HPP

#include <iostream>
#include <boost/date_time/posix_time/posix_time.hpp>
#include <boost/log/support/date_time.hpp>
#include <boost/log/common.hpp>
#include <boost/log/expressions.hpp>
#include <boost/log/expressions/keyword.hpp>

#include <boost/log/attributes.hpp>
#include <boost/log/attributes/timer.hpp>
#include <boost/log/sources/logger.hpp>
#include <boost/log/sources/severity_logger.hpp>
#include <boost/log/sinks/sync_frontend.hpp>
#include <boost/log/sinks/text_file_backend.hpp>

#include <boost/log/utility/setup/file.hpp>
#include <boost/log/utility/setup/console.hpp>
#include <boost/log/utility/setup/common_attributes.hpp>

#include <boost/log/attributes/named_scope.hpp>

namespace logging = boost::log;
namespace attrs = boost::log::attributes;
namespace src = boost::log::sources;
namespace sinks = boost::log::sinks;
namespace expr = boost::log::expressions;
namespace keywords = boost::log::keywords;

enum SeverityLevel
{
    Log_Info,
    Log_Notice,
    Log_Debug,
    Log_Warning,
    Log_Error,
    Log_Fatal
};

// The formatting logic for the severity level
template< typename CharT, typename TraitsT >
inline std::basic_ostream< CharT, TraitsT >& operator<< (
    std::basic_ostream< CharT, TraitsT >& strm, SeverityLevel lvl)
{
    static const char* const str[] =
    {
        "Info",
        "Notice",
        "Debug",
        "Warning",
        "Error",
        "Fatal"
    };
    if (static_cast< std::size_t >(lvl) < (sizeof(str) / sizeof(*str)))
        strm << str[lvl];
    else
        strm << static_cast< int >(lvl);
    return strm;
}

BOOST_LOG_ATTRIBUTE_KEYWORD(log_severity, "Severity", SeverityLevel)
BOOST_LOG_ATTRIBUTE_KEYWORD(log_timestamp, "TimeStamp", boost::posix_time::ptime)
BOOST_LOG_ATTRIBUTE_KEYWORD(log_uptime, "Uptime", attrs::timer::value_type)
BOOST_LOG_ATTRIBUTE_KEYWORD(log_scope, "Scope", attrs::named_scope::value_type)

void g_InitLog();

#endif

#include "boost.log.init.hpp"

void g_InitLog()
{
    logging::formatter formatter=
        expr::stream
        <<"["<<expr::format_date_time(log_timestamp,"%H:%M:%S")
        <<"]"<<expr::if_(expr::has_attr(log_uptime))
        [
            expr::stream<<" ["<<format_date_time(log_uptime,"%O:%M:%S")<<"]"
        ]

    <<expr::if_(expr::has_attr(log_scope))
        [
            expr::stream<<"["<<expr::format_named_scope(log_scope,keywords::format = "%n")<<"]"
        ]
    <<"<"<<log_severity<<">"<<expr::message;

    logging::add_common_attributes();

    auto console_sink=logging::add_console_log();
    auto file_sink=logging::add_file_log
        (
        keywords::file_name="%Y-%m-%d_%N.log",      //文件名
        keywords::rotation_size=10*1024*1024,       //单个文件限制大小
        keywords::time_based_rotation=sinks::file::rotation_at_time_point(0,0,0)    //每天重建
        );

    file_sink->locked_backend()->set_file_collector(sinks::file::make_collector(
        keywords::target="logs",        //文件夹名
        keywords::max_size=50*1024*1024,    //文件夹所占最大空间
        keywords::min_free_space=100*1024*1024  //磁盘最小预留空间
        ));

    file_sink->set_filter(log_severity>=Log_Warning);   //日志级别过滤

    file_sink->locked_backend()->scan_for_files();

    console_sink->set_formatter(formatter);
    file_sink->set_formatter(formatter);
    file_sink->locked_backend()->auto_flush(true);

    logging::core::get()->add_global_attribute("Scope",attrs::named_scope());
    logging::core::get()->add_sink(console_sink);
    logging::core::get()->add_sink(file_sink);
}