log.cpp

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/*******************************************************************************
* Copyright (C) 2016 Eddie Carle [eddie@isatec.ca]                             *
*                                                                              *
* This file is part of fastcgi++.                                              *
*                                                                              *
* fastcgi++ is free software: you can redistribute it and/or modify it under   *
* the terms of the GNU Lesser General Public License as  published by the Free *
* Software Foundation, either version 3 of the License, or (at your option)    *
* any later version.                                                           *
*                                                                              *
* fastcgi++ is distributed in the hope that it will be useful, but WITHOUT ANY *
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS    *
* FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for     *
* more details.                                                                *
*                                                                              *
* You should have received a copy of the GNU Lesser General Public License     *
* along with fastcgi++.  If not, see <http://www.gnu.org/licenses/>.           *
*******************************************************************************/

#include "fastcgi++/log.hpp"

#include <iomanip>
#include <iostream>
#include <ctime>
#include <codecvt>
#include <cstring>
#include <array>
#include <sstream>

#include <unistd.h>
#include <limits.h>
#include <sys/types.h>

namespace Fastcgipp
{
    namespace Logging
    {
        std::wstring getHostname()
        {
            char buffer[HOST_NAME_MAX+2];
            gethostname(buffer, sizeof(buffer));
            std::wstring_convert<std::codecvt_utf8<wchar_t>, wchar_t> converter;
            try
            {
                return(converter.from_bytes(
                            buffer,
                            buffer+std::strlen(buffer)));
            }
            catch(const std::range_error& e)
            {
                WARNING_LOG("Error in hostname code conversion from utf8")
                return std::wstring(L"localhost");
            }

        }

        std::wstring getProgram()
        {
            std::wstring_convert<std::codecvt_utf8<wchar_t>, wchar_t> converter;
            std::wostringstream ss;
            try
            {
                ss << converter.from_bytes(
                        program_invocation_name,
                        program_invocation_name
                            +std::strlen(program_invocation_name));
            }
            catch(const std::range_error& e)
            {
                WARNING_LOG("Error in program name code conversion from utf8")
                ss << "unknown";
            }

            ss << '[' << getpid() << ']';
            return ss.str();
        }

        std::array<std::wstring, 6> levels
        {{
            L"[info]: ",
            L"[fail]: ",
            L"[error]: ",
            L"[warning]: ",
            L"[debug]: ",
            L"[diagnostic]: "
        }};
    }
}

std::wostream* Fastcgipp::Logging::logstream(&std::wcerr);
std::mutex Fastcgipp::Logging::mutex;
bool Fastcgipp::Logging::suppress(false);
std::wstring Fastcgipp::Logging::hostname(Fastcgipp::Logging::getHostname());
std::wstring Fastcgipp::Logging::program(Fastcgipp::Logging::getProgram());

void Fastcgipp::Logging::header(Level level)
{
    const std::time_t now = std::time(nullptr);
    *logstream
        << std::put_time(std::localtime(&now), L"%b %d %H:%M:%S ")
        << hostname << ' ' << program << ' ' << levels[level];
}