如何从配置中设置boost日志严重级别?

How do I set the boost logging severity level from config?

本文关键字：日志 boost 配置 设置      更新时间：2023-10-16

我希望能够从配置中指定日志严重性级别:

# my config file
LogSeverity = info

我该怎么做?目前，我在我的main函数中有这样的东西:

// logging settings
boost::log::trivial::severity_level logSeverity;
boost::program_options::options_description loggingSettings                     
    ("Logging settings");                                                       
loggingSettings.add_options()                                                   
("LogSeverity", value<boost::log::trivial::severity_level>(&logSeverity)       
    ->required(),                                                               
        "log level to output");
variables_map vm;
store(parse_config_file(configFilestream, loggingSettings), vm);
notify(vm);
boost::log::core::get()->set_filter(                                         
    boost::log::trivial::severity >= logSeverity);
BOOST_LOG_TRIVIAL(info) << "severity " << logSeverity;

程序的输出是:

[2015-05-18 09:58:40.783298] [0x000007f017445078] [info] severity trace

但是，我在配置中将严重性设置为info(如上所述)，那么为什么它被设置为trace呢?

完整示例:

default.conf: 

# my config file
LogSeverity = info

main.cpp: 

#include <string>
#include <fstream>
#include <boost/log/trivial.hpp>
#include <boost/log/expressions.hpp>
#include <boost/program_options.hpp>
int main()
{
    // logging settings
    boost::log::trivial::severity_level logSeverity;
    boost::program_options::options_description loggingSettings
    ("Logging settings");
    loggingSettings.add_options()
    ("LogSeverity", boost::program_options::value<boost::log::trivial::severity_level>(&logSeverity)
    ->required(),
    "log level to output");
    std::ifstream conf_file("./default.conf");
    if (!conf_file)
        return 1;
    boost::program_options::variables_map variables_map;
    boost::program_options::store(boost::program_options::parse_config_file(conf_file, loggingSettings), variables_map);
    boost::program_options::notify(variables_map);
    boost::log::core::get()->set_filter(
    boost::log::trivial::severity >= logSeverity);
    BOOST_LOG_TRIVIAL(info) << "severity " << logSeverity;
    return 0;
}
输出:

[2015-05-19 01:22:57.666571] [0xc000027d] [info]    severity info

问题似乎是您不能直接从program_options分配到boost::log::trivia::severity类型。为了实现这一点，我将变量存储在std::string中，然后使用>>运算符将值输入severity类型:

// logging settings
std::string logSeverityString;
boost::log::trivial::severity_level logSeverity;
boost::program_options::options_description loggingSettings                     
    ("Logging settings");                                                       
loggingSettings.add_options()                                                   
("LogSeverity", value<boost::log::trivial::severity_level>(&logSeverityString)       
    ->required(),                                                               
        "log level to output");
variables_map vm;
store(parse_config_file(configFilestream, loggingSettings), vm);
notify(vm);
std::istringstream{logSeverityString} >> logSeverity;
boost::log::core::get()->set_filter(                                         
    boost::log::trivial::severity >= logSeverity);
BOOST_LOG_TRIVIAL(info) << "severity " << logSeverity;
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