Legends-of-Azeroth-Pandaria-5.4.8

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/*
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* This file is part of the Pandaria 5.4.8 Project. See THANKS file for Copyright information
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "AppenderFile.h"
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#include "Log.h"
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#include "LogMessage.h"
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#include "StringConvert.h"
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#include "Util.h"
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#include <algorithm>
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AppenderFile::AppenderFile(uint8 id, std::string const& name, LogLevel level, AppenderFlags flags, std::vector<std::string_view> const& args) :
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    Appender(id, name, level, flags),
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    logfile(nullptr),
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    _logDir(sLog->GetLogsDir()),
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    _maxFileSize(0),
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    _fileSize(0)
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{
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    if (args.size() < 4)
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        throw InvalidAppenderArgsException(Trinity::StringFormat("Log::CreateAppenderFromConfig: Missing file name for appender %s", name.c_str()));
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    _fileName.assign(args[3]);
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    std::string mode = "a";
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    if (4 < args.size())
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        mode.assign(args[4]);
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    if (flags & APPENDER_FLAGS_USE_TIMESTAMP)
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    {
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        size_t dot_pos = _fileName.find_last_of('.');
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        if (dot_pos != std::string::npos)
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            _fileName.insert(dot_pos, sLog->GetLogsTimestamp());
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        else
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            _fileName += sLog->GetLogsTimestamp();
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    }
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    if (5 < args.size())
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    {
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        if (Optional<uint32> size = Trinity::StringTo<uint32>(args[5]))
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            _maxFileSize = *size;
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        else
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            throw InvalidAppenderArgsException(Trinity::StringFormat("Log::CreateAppenderFromConfig: Invalid size '%s' for appender %s", std::string(args[5]).c_str(), name.c_str()));
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    }
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    _dynamicName = std::string::npos != _fileName.find("%s");
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    _backup = (flags & APPENDER_FLAGS_MAKE_FILE_BACKUP) != 0;
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    if (!_dynamicName)
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        logfile = OpenFile(_fileName, mode, (mode == "w") && _backup);
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}
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AppenderFile::~AppenderFile()
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{
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    CloseFile();
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}
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void AppenderFile::_write(LogMessage const* message)
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{
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    bool exceedMaxSize = _maxFileSize > 0 && (_fileSize.load() + message->Size()) > _maxFileSize;
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    if (_dynamicName)
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    {
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        char namebuf[TRINITY_PATH_MAX];
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        snprintf(namebuf, TRINITY_PATH_MAX, _fileName.c_str(), message->param1.c_str());
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        // always use "a" with dynamic name otherwise it could delete the log we wrote in last _write() call
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        FILE* file = OpenFile(namebuf, "a", _backup || exceedMaxSize);
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        if (!file)
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            return;
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        fprintf(file, "%s%s\n", message->prefix.c_str(), message->text.c_str());
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        fflush(file);
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        _fileSize += uint64(message->Size());
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        fclose(file);
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        return;
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    }
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    else if (exceedMaxSize)
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        logfile = OpenFile(_fileName, "w", true);
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    if (!logfile)
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        return;
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    fprintf(logfile, "%s%s\n", message->prefix.c_str(), message->text.c_str());
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    fflush(logfile);
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    _fileSize += uint64(message->Size());
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}
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FILE* AppenderFile::OpenFile(std::string const& filename, std::string const& mode, bool backup)
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{
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    std::string fullName(_logDir + filename);
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    if (backup)
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    {
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        CloseFile();
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        std::string newName(fullName);
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        newName.push_back('.');
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        newName.append(LogMessage::getTimeStr(time(nullptr)));
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        std::replace(newName.begin(), newName.end(), ':', '-');
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        rename(fullName.c_str(), newName.c_str()); // no error handling... if we couldn't make a backup, just ignore
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    }
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    if (FILE* ret = fopen(fullName.c_str(), mode.c_str()))
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    {
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        _fileSize = ftell(ret);
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        return ret;
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    }
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    return nullptr;
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}
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void AppenderFile::CloseFile()
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{
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    if (logfile)
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    {
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        fclose(logfile);
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        logfile = nullptr;
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    }
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}
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