AppenderFile.cpp

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/*
 * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program 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 General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "AppenderFile.h"
#include "Log.h"
#include "LogMessage.h"
#include "StringConvert.h"
#include <algorithm>
 
AppenderFile::AppenderFile(uint8 id, std::string const& name, LogLevel level, AppenderFlags flags, std::vector<std::string_view> const& args) :
 Appender(id, name, level, flags),
 logfile(nullptr),
 _logDir(sLog->GetLogsDir()),
 _maxFileSize(0),
 _fileSize(0)
{
 if (args.size() < 4)
 throw InvalidAppenderArgsException(Trinity::StringFormat("Log::CreateAppenderFromConfig: Missing file name for appender {}", name));
 
 _fileName.assign(args[3]);
 
 std::string mode = "a";
 if (4 < args.size())
 mode.assign(args[4]);
 
 if (flags & APPENDER_FLAGS_USE_TIMESTAMP)
 {
 size_t dot_pos = _fileName.find_last_of('.');
 if (dot_pos != std::string::npos)
 _fileName.insert(dot_pos, sLog->GetLogsTimestamp());
 else
 _fileName += sLog->GetLogsTimestamp();
 }
 
 if (5 < args.size())
 {
 if (Optional<uint32> size = Trinity::StringTo<uint32>(args[5]))
 _maxFileSize = *size;
 else
 throw InvalidAppenderArgsException(Trinity::StringFormat("Log::CreateAppenderFromConfig: Invalid size '{}' for appender {}", args[5], name));
 }
 
 _dynamicName = std::string::npos != _fileName.find("%s");
 _backup = (flags & APPENDER_FLAGS_MAKE_FILE_BACKUP) != 0;
 
 if (!_dynamicName)
 logfile = OpenFile(_fileName, mode, (mode == "w") && _backup);
}
 
AppenderFile::~AppenderFile()
{
 CloseFile();
}
 
void AppenderFile::_write(LogMessage const* message)
{
 bool exceedMaxSize = _maxFileSize > 0 && (_fileSize.load() + message->Size()) > _maxFileSize;
 
 if (_dynamicName)
 {
 char namebuf[TRINITY_PATH_MAX];
 snprintf(namebuf, TRINITY_PATH_MAX, _fileName.c_str(), message->param1.c_str());
 // always use "a" with dynamic name otherwise it could delete the log we wrote in last _write() call
 FILE* file = OpenFile(namebuf, "a", _backup || exceedMaxSize);
 if (!file)
 return;
 fprintf(file, "%s%s\n", message->prefix.c_str(), message->text.c_str());
 fflush(file);
 _fileSize += uint64(message->Size());
 fclose(file);
 return;
 }
 else if (exceedMaxSize)
 logfile = OpenFile(_fileName, "w", true);
 
 if (!logfile)
 return;
 
 fprintf(logfile, "%s%s\n", message->prefix.c_str(), message->text.c_str());
 fflush(logfile);
 _fileSize += uint64(message->Size());
}
 
FILE* AppenderFile::OpenFile(std::string const& filename, std::string const& mode, bool backup)
{
 std::string fullName(_logDir + filename);
 if (backup)
 {
 CloseFile();
 std::string newName(fullName);
 newName.push_back('.');
 newName.append(LogMessage::getTimeStr(time(nullptr)));
 std::replace(newName.begin(), newName.end(), ':', '-');
 rename(fullName.c_str(), newName.c_str()); // no error handling... if we couldn't make a backup, just ignore
 }
 
 if (FILE* ret = fopen(fullName.c_str(), mode.c_str()))
 {
 _fileSize = ftell(ret);
 return ret;
 }
 
 return nullptr;
}
 
void AppenderFile::CloseFile()
{
 if (logfile)
 {
 fclose(logfile);
 logfile = nullptr;
 }
}