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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2008 Thomas Stagner <aquanight@inspircd.org>
* Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
*
* This file is part of InspIRCd. InspIRCd 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, version 2.
*
* 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 "inspircd.h"
#include "xline.h"
#include <fstream>
class ModuleXLineDB : public Module
{
bool dirty;
std::string xlinedbpath;
public:
void init() CXX11_OVERRIDE
{
/* Load the configuration
* Note:
* this is on purpose not in the OnRehash() method. It would be non-trivial to change the database on-the-fly.
* Imagine a scenario where the new file already exists. Merging the current XLines with the existing database is likely a bad idea
* ...and so is discarding all current in-memory XLines for the ones in the database.
*/
ConfigTag* Conf = ServerInstance->Config->ConfValue("xlinedb");
xlinedbpath = Conf->getString("filename", DATA_PATH "/xline.db");
// Read xlines before attaching to events
ReadDatabase();
Implementation eventlist[] = { I_OnAddLine, I_OnDelLine, I_OnExpireLine, I_OnBackgroundTimer };
ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
dirty = false;
}
/** Called whenever an xline is added by a local user.
* This method is triggered after the line is added.
* @param source The sender of the line or NULL for local server
* @param line The xline being added
*/
void OnAddLine(User* source, XLine* line) CXX11_OVERRIDE
{
dirty = true;
}
/** Called whenever an xline is deleted.
* This method is triggered after the line is deleted.
* @param source The user removing the line or NULL for local server
* @param line the line being deleted
*/
void OnDelLine(User* source, XLine* line) CXX11_OVERRIDE
{
dirty = true;
}
void OnExpireLine(XLine *line) CXX11_OVERRIDE
{
dirty = true;
}
void OnBackgroundTimer(time_t now) CXX11_OVERRIDE
{
if (dirty)
{
if (WriteDatabase())
dirty = false;
}
}
bool WriteDatabase()
{
/*
* We need to perform an atomic write so as not to fuck things up.
* So, let's write to a temporary file, flush it, then rename the file..
* Technically, that means that this can block, but I have *never* seen that.
* -- w00t
*/
ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "xlinedb: Opening temporary database");
std::string xlinenewdbpath = xlinedbpath + ".new";
std::ofstream stream(xlinenewdbpath.c_str());
if (!stream.is_open())
{
ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "xlinedb: Cannot create database! %s (%d)", strerror(errno), errno);
ServerInstance->SNO->WriteToSnoMask('a', "database: cannot create new db: %s (%d)", strerror(errno), errno);
return false;
}
ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "xlinedb: Opened. Writing..");
/*
* Now, much as I hate writing semi-unportable formats, additional
* xline types may not have a conf tag, so let's just write them.
* In addition, let's use a file version, so we can maintain some
* semblance of backwards compatibility for reading on startup..
* -- w00t
*/
stream << "VERSION 1" << std::endl;
// Now, let's write.
std::vector<std::string> types = ServerInstance->XLines->GetAllTypes();
for (std::vector<std::string>::const_iterator it = types.begin(); it != types.end(); ++it)
{
XLineLookup* lookup = ServerInstance->XLines->GetAll(*it);
if (!lookup)
continue; // Not possible as we just obtained the list from XLineManager
for (LookupIter i = lookup->begin(); i != lookup->end(); ++i)
{
XLine* line = i->second;
stream << "LINE " << line->type << " " << line->Displayable() << " "
<< ServerInstance->Config->ServerName << " " << line->set_time << " "
<< line->duration << " " << line->reason << std::endl;
}
}
ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "xlinedb: Finished writing XLines. Checking for error..");
if (stream.fail())
{
ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "xlinedb: Cannot write to new database! %s (%d)", strerror(errno), errno);
ServerInstance->SNO->WriteToSnoMask('a', "database: cannot write to new db: %s (%d)", strerror(errno), errno);
return false;
}
stream.close();
#ifdef _WIN32
if (remove(xlinedbpath.c_str()))
{
ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "xlinedb: Cannot remove old database! %s (%d)", strerror(errno), errno);
ServerInstance->SNO->WriteToSnoMask('a', "database: cannot remove old database: %s (%d)", strerror(errno), errno);
return false;
}
#endif
// Use rename to move temporary to new db - this is guarenteed not to fuck up, even in case of a crash.
if (rename(xlinenewdbpath.c_str(), xlinedbpath.c_str()) < 0)
{
ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "xlinedb: Cannot move new to old database! %s (%d)", strerror(errno), errno);
ServerInstance->SNO->WriteToSnoMask('a', "database: cannot replace old with new db: %s (%d)", strerror(errno), errno);
return false;
}
return true;
}
bool ReadDatabase()
{
// If the xline database doesn't exist then we don't need to load it.
if (!ServerConfig::FileExists(xlinedbpath.c_str()))
return true;
std::ifstream stream(xlinedbpath.c_str());
if (!stream.is_open())
{
ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "xlinedb: Cannot read database! %s (%d)", strerror(errno), errno);
ServerInstance->SNO->WriteToSnoMask('a', "database: cannot read db: %s (%d)", strerror(errno), errno);
return false;
}
std::string line;
while (std::getline(stream, line))
{
// Inspired by the command parser. :)
irc::tokenstream tokens(line);
int items = 0;
std::string command_p[7];
std::string tmp;
while (tokens.GetToken(tmp) && (items < 7))
{
command_p[items] = tmp;
items++;
}
ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "xlinedb: Processing %s", line.c_str());
if (command_p[0] == "VERSION")
{
if (command_p[1] != "1")
{
stream.close();
ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "xlinedb: I got database version %s - I don't understand it", command_p[1].c_str());
ServerInstance->SNO->WriteToSnoMask('a', "database: I got a database version (%s) I don't understand", command_p[1].c_str());
return false;
}
}
else if (command_p[0] == "LINE")
{
// Mercilessly stolen from spanningtree
XLineFactory* xlf = ServerInstance->XLines->GetFactory(command_p[1]);
if (!xlf)
{
ServerInstance->SNO->WriteToSnoMask('a', "database: Unknown line type (%s).", command_p[1].c_str());
continue;
}
XLine* xl = xlf->Generate(ServerInstance->Time(), atoi(command_p[5].c_str()), command_p[3], command_p[6], command_p[2]);
xl->SetCreateTime(atoi(command_p[4].c_str()));
if (ServerInstance->XLines->AddLine(xl, NULL))
{
ServerInstance->SNO->WriteToSnoMask('x', "database: Added a line of type %s", command_p[1].c_str());
}
else
delete xl;
}
}
stream.close();
return true;
}
Version GetVersion() CXX11_OVERRIDE
{
return Version("Keeps a dynamic log of all XLines created, and stores them in a separate conf file (xline.db).", VF_VENDOR);
}
};
MODULE_INIT(ModuleXLineDB)
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