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m_mysql.cpp

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/*       +------------------------------------+
 *       | Inspire Internet Relay Chat Daemon |
 *       +------------------------------------+
 *
 *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
 * See: http://www.inspircd.org/wiki/index.php/Credits
 *
 * This program is free but copyrighted software; see
 *          the file COPYING for details.
 *
 * ---------------------------------------------------
 */

/* Stop mysql wanting to use long long */
#define NO_CLIENT_LONG_LONG

#include "inspircd.h"
#include <mysql.h>
#include "m_sqlv2.h"

#ifdef WINDOWS
#pragma comment(lib, "mysqlclient.lib")
#endif

/* VERSION 2 API: With nonblocking (threaded) requests */

/* $ModDesc: SQL Service Provider module for all other m_sql* modules */
/* $CompileFlags: exec("mysql_config --include") */
/* $LinkerFlags: exec("mysql_config --libs_r") rpath("mysql_config --libs_r") */
/* $ModDep: m_sqlv2.h */

/* THE NONBLOCKING MYSQL API!
 *
 * MySQL provides no nonblocking (asyncronous) API of its own, and its developers recommend
 * that instead, you should thread your program. This is what i've done here to allow for
 * asyncronous SQL requests via mysql. The way this works is as follows:
 *
 * The module spawns a thread via class Thread, and performs its mysql queries in this thread,
 * using a queue with priorities. There is a mutex on either end which prevents two threads
 * adjusting the queue at the same time, and crashing the ircd. Every 50 milliseconds, the
 * worker thread wakes up, and checks if there is a request at the head of its queue.
 * If there is, it processes this request, blocking the worker thread but leaving the ircd
 * thread to go about its business as usual. During this period, the ircd thread is able
 * to insert futher pending requests into the queue.
 *
 * Once the processing of a request is complete, it is removed from the incoming queue to
 * an outgoing queue, and initialized as a 'response'. The worker thread then signals the
 * ircd thread (via a loopback socket) of the fact a result is available, by sending the
 * connection ID through the connection.
 *
 * The ircd thread then mutexes the queue once more, reads the outbound response off the head
 * of the queue, and sends it on its way to the original calling module.
 *
 * XXX: You might be asking "why doesnt he just send the response from within the worker thread?"
 * The answer to this is simple. The majority of InspIRCd, and in fact most ircd's are not
 * threadsafe. This module is designed to be threadsafe and is careful with its use of threads,
 * however, if we were to call a module's OnRequest even from within a thread which was not the
 * one the module was originally instantiated upon, there is a chance of all hell breaking loose
 * if a module is ever put in a re-enterant state (stack corruption could occur, crashes, data
 * corruption, and worse, so DONT think about it until the day comes when InspIRCd is 100%
 * gauranteed threadsafe!)
 *
 * For a diagram of this system please see http://www.inspircd.org/wiki/Mysql2
 */


class SQLConnection;
class MySQLListener;


typedef std::map<std::string, SQLConnection*> ConnMap;
static MySQLListener *MessagePipe = NULL;
int QueueFD = -1;

class DispatcherThread;

class ModuleSQL : public Module
{
 public:

         ConfigReader *Conf;
         InspIRCd* PublicServerInstance;
         int currid;
         bool rehashing;
         DispatcherThread* Dispatcher;
         Mutex* QueueMutex;
         Mutex* ResultsMutex;
         Mutex* LoggingMutex;
         Mutex* ConnMutex;

         ModuleSQL(InspIRCd* Me);
         ~ModuleSQL();
         unsigned long NewID();
         const char* OnRequest(Request* request);
         void OnRehash(User* user, const std::string &parameter);
         Version GetVersion();
};



#if !defined(MYSQL_VERSION_ID) || MYSQL_VERSION_ID<32224
#define mysql_field_count mysql_num_fields
#endif

typedef std::deque<SQLresult*> ResultQueue;

class MySQLresult : public SQLresult
{
        int currentrow;
        std::vector<std::string> colnames;
        std::vector<SQLfieldList> fieldlists;
        SQLfieldMap* fieldmap;
        SQLfieldMap fieldmap2;
        SQLfieldList emptyfieldlist;
        int rows;
 public:

        MySQLresult(Module* self, Module* to, MYSQL_RES* res, int affected_rows, unsigned int rid) : SQLresult(self, to, rid), currentrow(0), fieldmap(NULL)
        {
                /* A number of affected rows from from mysql_affected_rows.
                 */
                fieldlists.clear();
                rows = 0;
                if (affected_rows >= 1)
                {
                        rows = affected_rows;
                        fieldlists.resize(rows);
                }
                unsigned int field_count = 0;
                if (res)
                {
                        MYSQL_ROW row;
                        int n = 0;
                        while ((row = mysql_fetch_row(res)))
                        {
                                if (fieldlists.size() < (unsigned int)rows+1)
                                {
                                        fieldlists.resize(fieldlists.size()+1);
                                }
                                field_count = 0;
                                MYSQL_FIELD *fields = mysql_fetch_fields(res);
                                if(mysql_num_fields(res) == 0)
                                        break;
                                if (fields && mysql_num_fields(res))
                                {
                                        colnames.clear();
                                        while (field_count < mysql_num_fields(res))
                                        {
                                                std::string a = (fields[field_count].name ? fields[field_count].name : "");
                                                std::string b = (row[field_count] ? row[field_count] : "");
                                                SQLfield sqlf(b, !row[field_count]);
                                                colnames.push_back(a);
                                                fieldlists[n].push_back(sqlf);
                                                field_count++;
                                        }
                                        n++;
                                }
                                rows++;
                        }
                        mysql_free_result(res);
                }
        }

        MySQLresult(Module* self, Module* to, SQLerror e, unsigned int rid) : SQLresult(self, to, rid), currentrow(0)
        {
                rows = 0;
                error = e;
        }

        ~MySQLresult()
        {
        }

        virtual int Rows()
        {
                return rows;
        }

        virtual int Cols()
        {
                return colnames.size();
        }

        virtual std::string ColName(int column)
        {
                if (column < (int)colnames.size())
                {
                        return colnames[column];
                }
                else
                {
                        throw SQLbadColName();
                }
                return "";
        }

        virtual int ColNum(const std::string &column)
        {
                for (unsigned int i = 0; i < colnames.size(); i++)
                {
                        if (column == colnames[i])
                                return i;
                }
                throw SQLbadColName();
                return 0;
        }

        virtual SQLfield GetValue(int row, int column)
        {
                if ((row >= 0) && (row < rows) && (column >= 0) && (column < Cols()))
                {
                        return fieldlists[row][column];
                }

                throw SQLbadColName();

                /* XXX: We never actually get here because of the throw */
                return SQLfield("",true);
        }

        virtual SQLfieldList& GetRow()
        {
                if (currentrow < rows)
                        return fieldlists[currentrow++];
                else
                        return emptyfieldlist;
        }

        virtual SQLfieldMap& GetRowMap()
        {
                fieldmap2.clear();

                if (currentrow < rows)
                {
                        for (int i = 0; i < Cols(); i++)
                        {
                                fieldmap2.insert(std::make_pair(colnames[i],GetValue(currentrow, i)));
                        }
                        currentrow++;
                }

                return fieldmap2;
        }

        virtual SQLfieldList* GetRowPtr()
        {
                SQLfieldList* fieldlist = new SQLfieldList();

                if (currentrow < rows)
                {
                        for (int i = 0; i < Rows(); i++)
                        {
                                fieldlist->push_back(fieldlists[currentrow][i]);
                        }
                        currentrow++;
                }
                return fieldlist;
        }

        virtual SQLfieldMap* GetRowMapPtr()
        {
                fieldmap = new SQLfieldMap();

                if (currentrow < rows)
                {
                        for (int i = 0; i < Cols(); i++)
                        {
                                fieldmap->insert(std::make_pair(colnames[i],GetValue(currentrow, i)));
                        }
                        currentrow++;
                }

                return fieldmap;
        }

        virtual void Free(SQLfieldMap* fm)
        {
                delete fm;
        }

        virtual void Free(SQLfieldList* fl)
        {
                delete fl;
        }
};

class SQLConnection;

void NotifyMainThread(SQLConnection* connection_with_new_result);

class SQLConnection : public classbase
{
 protected:

        MYSQL connection;
        MYSQL_RES *res;
        MYSQL_ROW row;
        SQLhost host;
        std::map<std::string,std::string> thisrow;
        bool Enabled;
        ModuleSQL* Parent;

 public:

        QueryQueue queue;
        ResultQueue rq;

        // This constructor creates an SQLConnection object with the given credentials, but does not connect yet.
        SQLConnection(const SQLhost &hi, ModuleSQL* Creator) : host(hi), Enabled(false), Parent(Creator)
        {
        }

        ~SQLConnection()
        {
                Close();
        }

        // This method connects to the database using the credentials supplied to the constructor, and returns
        // true upon success.
        bool Connect()
        {
                unsigned int timeout = 1;
                mysql_init(&connection);
                mysql_options(&connection,MYSQL_OPT_CONNECT_TIMEOUT,(char*)&timeout);
                return mysql_real_connect(&connection, host.host.c_str(), host.user.c_str(), host.pass.c_str(), host.name.c_str(), host.port, NULL, 0);
        }

        void DoLeadingQuery()
        {
                if (!CheckConnection())
                        return;

                /* Parse the command string and dispatch it to mysql */
                SQLrequest& req = queue.front();

                /* Pointer to the buffer we screw around with substitution in */
                char* query;

                /* Pointer to the current end of query, where we append new stuff */
                char* queryend;

                /* Total length of the unescaped parameters */
                unsigned long paramlen;

                /* Total length of query, used for binary-safety in mysql_real_query */
                unsigned long querylength = 0;

                paramlen = 0;

                for(ParamL::iterator i = req.query.p.begin(); i != req.query.p.end(); i++)
                {
                        paramlen += i->size();
                }

                /* To avoid a lot of allocations, allocate enough memory for the biggest the escaped query could possibly be.
                 * sizeofquery + (totalparamlength*2) + 1
                 *
                 * The +1 is for null-terminating the string for mysql_real_escape_string
                 */

                query = new char[req.query.q.length() + (paramlen*2) + 1];
                queryend = query;

                /* Okay, now we have a buffer large enough we need to start copying the query into it and escaping and substituting
                 * the parameters into it...
                 */

                for(unsigned long i = 0; i < req.query.q.length(); i++)
                {
                        if(req.query.q[i] == '?')
                        {
                                /* We found a place to substitute..what fun.
                                 * use mysql calls to escape and write the
                                 * escaped string onto the end of our query buffer,
                                 * then we "just" need to make sure queryend is
                                 * pointing at the right place.
                                 */
                                if(req.query.p.size())
                                {
                                        unsigned long len = mysql_real_escape_string(&connection, queryend, req.query.p.front().c_str(), req.query.p.front().length());

                                        queryend += len;
                                        req.query.p.pop_front();
                                }
                                else
                                        break;
                        }
                        else
                        {
                                *queryend = req.query.q[i];
                                queryend++;
                        }
                        querylength++;
                }

                *queryend = 0;

                Parent->QueueMutex->Lock();
                req.query.q = query;
                Parent->QueueMutex->Unlock();

                if (!mysql_real_query(&connection, req.query.q.data(), req.query.q.length()))
                {
                        /* Successfull query */
                        res = mysql_use_result(&connection);
                        unsigned long rows = mysql_affected_rows(&connection);
                        MySQLresult* r = new MySQLresult(Parent, req.GetSource(), res, rows, req.id);
                        r->dbid = this->GetID();
                        r->query = req.query.q;
                        /* Put this new result onto the results queue.
                         * XXX: Remember to mutex the queue!
                         */
                        Parent->ResultsMutex->Lock();
                        rq.push_back(r);
                        Parent->ResultsMutex->Unlock();
                }
                else
                {
                        /* XXX: See /usr/include/mysql/mysqld_error.h for a list of
                         * possible error numbers and error messages */
                        SQLerror e(SQL_QREPLY_FAIL, ConvToStr(mysql_errno(&connection)) + std::string(": ") + mysql_error(&connection));
                        MySQLresult* r = new MySQLresult(Parent, req.GetSource(), e, req.id);
                        r->dbid = this->GetID();
                        r->query = req.query.q;

                        Parent->ResultsMutex->Lock();
                        rq.push_back(r);
                        Parent->ResultsMutex->Unlock();
                }

                /* Now signal the main thread that we've got a result to process.
                 * Pass them this connection id as what to examine
                 */

                delete[] query;

                NotifyMainThread(this);
        }

        bool ConnectionLost()
        {
                if (&connection) {
                        return (mysql_ping(&connection) != 0);
                }
                else return false;
        }

        bool CheckConnection()
        {
                if (ConnectionLost()) {
                        return Connect();
                }
                else return true;
        }

        std::string GetError()
        {
                return mysql_error(&connection);
        }

        const std::string& GetID()
        {
                return host.id;
        }

        std::string GetHost()
        {
                return host.host;
        }

        void SetEnable(bool Enable)
        {
                Enabled = Enable;
        }

        bool IsEnabled()
        {
                return Enabled;
        }

        void Close()
        {
                mysql_close(&connection);
        }

        const SQLhost& GetConfHost()
        {
                return host;
        }

};

ConnMap Connections;

bool HasHost(const SQLhost &host)
{
        for (ConnMap::iterator iter = Connections.begin(); iter != Connections.end(); iter++)
        {
                if (host == iter->second->GetConfHost())
                        return true;
        }
        return false;
}

bool HostInConf(ConfigReader* conf, const SQLhost &h)
{
        for(int i = 0; i < conf->Enumerate("database"); i++)
        {
                SQLhost host;
                host.id         = conf->ReadValue("database", "id", i);
                host.host       = conf->ReadValue("database", "hostname", i);
                host.port       = conf->ReadInteger("database", "port", i, true);
                host.name       = conf->ReadValue("database", "name", i);
                host.user       = conf->ReadValue("database", "username", i);
                host.pass       = conf->ReadValue("database", "password", i);
                host.ssl        = conf->ReadFlag("database", "ssl", i);
                if (h == host)
                        return true;
        }
        return false;
}

void ClearOldConnections(ConfigReader* conf)
{
        ConnMap::iterator i,safei;
        for (i = Connections.begin(); i != Connections.end(); i++)
        {
                if (!HostInConf(conf, i->second->GetConfHost()))
                {
                        delete i->second;
                        safei = i;
                        --i;
                        Connections.erase(safei);
                }
        }
}

void ClearAllConnections()
{
        ConnMap::iterator i;
        while ((i = Connections.begin()) != Connections.end())
        {
                Connections.erase(i);
                delete i->second;
        }
}

void ConnectDatabases(InspIRCd* ServerInstance, ModuleSQL* Parent)
{
        for (ConnMap::iterator i = Connections.begin(); i != Connections.end(); i++)
        {
                if (i->second->IsEnabled())
                        continue;

                i->second->SetEnable(true);
                if (!i->second->Connect())
                {
                        /* XXX: MUTEX */
                        Parent->LoggingMutex->Lock();
                        ServerInstance->Logs->Log("m_mysql",DEFAULT,"SQL: Failed to connect database "+i->second->GetHost()+": Error: "+i->second->GetError());
                        i->second->SetEnable(false);
                        Parent->LoggingMutex->Unlock();
                }
        }
}

void LoadDatabases(ConfigReader* conf, InspIRCd* ServerInstance, ModuleSQL* Parent)
{
        Parent->ConnMutex->Lock();
        ClearOldConnections(conf);
        for (int j =0; j < conf->Enumerate("database"); j++)
        {
                SQLhost host;
                host.id         = conf->ReadValue("database", "id", j);
                host.host       = conf->ReadValue("database", "hostname", j);
                host.port       = conf->ReadInteger("database", "port", j, true);
                host.name       = conf->ReadValue("database", "name", j);
                host.user       = conf->ReadValue("database", "username", j);
                host.pass       = conf->ReadValue("database", "password", j);
                host.ssl        = conf->ReadFlag("database", "ssl", j);

                if (HasHost(host))
                        continue;

                if (!host.id.empty() && !host.host.empty() && !host.name.empty() && !host.user.empty() && !host.pass.empty())
                {
                        SQLConnection* ThisSQL = new SQLConnection(host, Parent);
                        Connections[host.id] = ThisSQL;
                }
        }
        ConnectDatabases(ServerInstance, Parent);
        Parent->ConnMutex->Unlock();
}

char FindCharId(const std::string &id)
{
        char i = 1;
        for (ConnMap::iterator iter = Connections.begin(); iter != Connections.end(); ++iter, ++i)
        {
                if (iter->first == id)
                {
                        return i;
                }
        }
        return 0;
}

ConnMap::iterator GetCharId(char id)
{
        char i = 1;
        for (ConnMap::iterator iter = Connections.begin(); iter != Connections.end(); ++iter, ++i)
        {
                if (i == id)
                        return iter;
        }
        return Connections.end();
}

void NotifyMainThread(SQLConnection* connection_with_new_result)
{
        /* Here we write() to the socket the main thread has open
         * and we connect()ed back to before our thread became active.
         * The main thread is using a nonblocking socket tied into
         * the socket engine, so they wont block and they'll receive
         * nearly instant notification. Because we're in a seperate
         * thread, we can just use standard connect(), and we can
         * block if we like. We just send the connection id of the
         * connection back.
         *
         * NOTE: We only send a single char down the connection, this
         * way we know it wont get a partial read at the other end if
         * the system is especially congested (see bug #263).
         * The function FindCharId translates a connection name into a
         * one character id, and GetCharId translates a character id
         * back into an iterator.
         */
        char id = FindCharId(connection_with_new_result->GetID());
        send(QueueFD, &id, 1, 0);
}

class ModuleSQL;

class DispatcherThread : public Thread
{
 private:
        ModuleSQL* Parent;
        InspIRCd* ServerInstance;
 public:
        DispatcherThread(InspIRCd* Instance, ModuleSQL* CreatorModule) : Thread(), Parent(CreatorModule), ServerInstance(Instance) { }
        ~DispatcherThread() { }
        virtual void Run();
};

class Notifier : public BufferedSocket
{
        ModuleSQL* Parent;

 public:
        Notifier(ModuleSQL* P, InspIRCd* SI, int newfd, char* ip) : BufferedSocket(SI, newfd, ip), Parent(P) { }

        virtual bool OnDataReady()
        {
                char data = 0;
                /* NOTE: Only a single character is read so we know we
                 * cant get a partial read. (We've been told that theres
                 * data waiting, so we wont ever get EAGAIN)
                 * The function GetCharId translates a single character
                 * back into an iterator.
                 */

                if (ServerInstance->SE->Recv(this, &data, 1, 0) > 0)
                {
                        Parent->ConnMutex->Lock();
                        ConnMap::iterator iter = GetCharId(data);
                        if (iter != Connections.end())
                        {
                                /* Lock the mutex, send back the data */
                                Parent->ResultsMutex->Lock();
                                ResultQueue::iterator n = iter->second->rq.begin();
                                (*n)->Send();
                                delete (*n);
                                iter->second->rq.pop_front();
                                Parent->ResultsMutex->Unlock();
                                Parent->ConnMutex->Unlock();
                                return true;
                        }
                        /* No error, but unknown id */
                        Parent->ConnMutex->Unlock();
                        return true;
                }

                /* Erk, error on descriptor! */
                return false;
        }
};

class MySQLListener : public ListenSocketBase
{
        ModuleSQL* Parent;
        irc::sockets::insp_sockaddr sock_us;
        socklen_t uslen;
        FileReader* index;

 public:
        MySQLListener(ModuleSQL* P, InspIRCd* Instance, int port, const std::string &addr) : ListenSocketBase(Instance, port, addr), Parent(P)
        {
                uslen = sizeof(sock_us);
                if (getsockname(this->fd,(sockaddr*)&sock_us,&uslen))
                {
                        throw ModuleException("Could not getsockname() to find out port number for ITC port");
                }
        }

        virtual void OnAcceptReady(const std::string &ipconnectedto, int nfd, const std::string &incomingip)
        {
                new Notifier(this->Parent, this->ServerInstance, nfd, (char *)ipconnectedto.c_str()); // XXX unsafe casts suck
        }

        /* Using getsockname and ntohs, we can determine which port number we were allocated */
        int GetPort()
        {
#ifdef IPV6
                return ntohs(sock_us.sin6_port);
#else
                return ntohs(sock_us.sin_port);
#endif
        }
};

ModuleSQL::ModuleSQL(InspIRCd* Me) : Module(Me), rehashing(false)
{
        ServerInstance->Modules->UseInterface("SQLutils");

        Conf = new ConfigReader(ServerInstance);
        PublicServerInstance = ServerInstance;
        currid = 0;

        /* Create a socket on a random port. Let the tcp stack allocate us an available port */
#ifdef IPV6
        MessagePipe = new MySQLListener(this, ServerInstance, 0, "::1");
#else
        MessagePipe = new MySQLListener(this, ServerInstance, 0, "127.0.0.1");
#endif

        LoggingMutex = ServerInstance->Mutexes->CreateMutex();
        ConnMutex = ServerInstance->Mutexes->CreateMutex();

        if (MessagePipe->GetFd() == -1)
        {
                delete ConnMutex;
                ServerInstance->Modules->DoneWithInterface("SQLutils");
                throw ModuleException("m_mysql: unable to create ITC pipe");
        }
        else
        {
                LoggingMutex->Lock();
                ServerInstance->Logs->Log("m_mysql", DEBUG, "MySQL: Interthread comms port is %d", MessagePipe->GetPort());
                LoggingMutex->Unlock();
        }

        Dispatcher = new DispatcherThread(ServerInstance, this);
        ServerInstance->Threads->Create(Dispatcher);

        ResultsMutex = ServerInstance->Mutexes->CreateMutex();
        QueueMutex = ServerInstance->Mutexes->CreateMutex();

        if (!ServerInstance->Modules->PublishFeature("SQL", this))
        {
                /* Tell worker thread to exit NOW,
                 * Automatically joins */
                delete Dispatcher;
                delete LoggingMutex;
                delete ResultsMutex;
                delete QueueMutex;
                delete ConnMutex;
                ServerInstance->Modules->DoneWithInterface("SQLutils");
                throw ModuleException("m_mysql: Unable to publish feature 'SQL'");
        }

        ServerInstance->Modules->PublishInterface("SQL", this);
        Implementation eventlist[] = { I_OnRehash, I_OnRequest };
        ServerInstance->Modules->Attach(eventlist, this, 2);
}

ModuleSQL::~ModuleSQL()
{
        delete Dispatcher;
        ClearAllConnections();
        delete Conf;
        ServerInstance->Modules->UnpublishInterface("SQL", this);
        ServerInstance->Modules->UnpublishFeature("SQL");
        ServerInstance->Modules->DoneWithInterface("SQLutils");
        delete LoggingMutex;
        delete ResultsMutex;
        delete QueueMutex;
        delete ConnMutex;
}

unsigned long ModuleSQL::NewID()
{
        if (currid+1 == 0)
                currid++;
        return ++currid;
}

const char* ModuleSQL::OnRequest(Request* request)
{
        if(strcmp(SQLREQID, request->GetId()) == 0)
        {
                SQLrequest* req = (SQLrequest*)request;

                /* XXX: Lock */
                QueueMutex->Lock();

                ConnMap::iterator iter;

                const char* returnval = NULL;

                ConnMutex->Lock();
                if((iter = Connections.find(req->dbid)) != Connections.end())
                {
                        req->id = NewID();
                        iter->second->queue.push(*req);
                        returnval = SQLSUCCESS;
                }
                else
                {
                        req->error.Id(SQL_BAD_DBID);
                }

                ConnMutex->Unlock();
                QueueMutex->Unlock();

                return returnval;
        }

        return NULL;
}

void ModuleSQL::OnRehash(User* user, const std::string &parameter)
{
        rehashing = true;
}

Version ModuleSQL::GetVersion()
{
        return Version("$Id: m_mysql.cpp 10622 2008-10-04 21:27:52Z brain $", VF_VENDOR | VF_SERVICEPROVIDER, API_VERSION);
}

void DispatcherThread::Run()
{
        LoadDatabases(Parent->Conf, Parent->PublicServerInstance, Parent);

        /* Connect back to the Notifier */

        if ((QueueFD = socket(AF_FAMILY, SOCK_STREAM, 0)) == -1)
        {
                /* crap, we're out of sockets... */
                return;
        }

        irc::sockets::insp_sockaddr addr;

#ifdef IPV6
        irc::sockets::insp_aton("::1", &addr.sin6_addr);
        addr.sin6_family = AF_FAMILY;
        addr.sin6_port = htons(MessagePipe->GetPort());
#else
        irc::sockets::insp_inaddr ia;
        irc::sockets::insp_aton("127.0.0.1", &ia);
        addr.sin_family = AF_FAMILY;
        addr.sin_addr = ia;
        addr.sin_port = htons(MessagePipe->GetPort());
#endif

        if (connect(QueueFD, (sockaddr*)&addr,sizeof(addr)) == -1)
        {
                /* wtf, we cant connect to it, but we just created it! */
                return;
        }

        while (this->GetExitFlag() == false)
        {
                if (Parent->rehashing)
                {
                /* XXX: Lock */
                        Parent->QueueMutex->Lock();
                        Parent->rehashing = false;
                        LoadDatabases(Parent->Conf, Parent->PublicServerInstance, Parent);
                        Parent->QueueMutex->Unlock();
                        /* XXX: Unlock */
                }

                SQLConnection* conn = NULL;
                /* XXX: Lock here for safety */
                Parent->QueueMutex->Lock();
                Parent->ConnMutex->Lock();
                for (ConnMap::iterator i = Connections.begin(); i != Connections.end(); i++)
                {
                        if (i->second->queue.totalsize())
                        {
                                conn = i->second;
                                break;
                        }
                }
                Parent->ConnMutex->Unlock();
                Parent->QueueMutex->Unlock();
                /* XXX: Unlock */

                /* Theres an item! */
                if (conn)
                {
                        conn->DoLeadingQuery();

                        /* XXX: Lock */
                        Parent->QueueMutex->Lock();
                        conn->queue.pop();
                        Parent->QueueMutex->Unlock();
                        /* XXX: Unlock */
                }

                usleep(1000);
        }
}

MODULE_INIT(ModuleSQL)