src/modules/extra/m_mysql.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd is copyright (C) 2002-2004 ChatSpike-Dev.
   6  *                     E-mail:
   7  *              <brain@chatspike.net>
   8  *                <Craig@chatspike.net>
   9  *
  10  * Written by Craig Edwards, Craig McLure, and others.
  11  * This program is free but copyrighted software; see
  12  *          the file COPYING for details.
  13  *
  14  * ---------------------------------------------------
  15  */
  16
  17 using namespace std;
  18
  19 #include <stdio.h>
  20 #include <string>
  21 #include <mysql.h>
  22 #include <pthread.h>
  23 #include "users.h"
  24 #include "channels.h"
  25 #include "modules.h"
  26 #include "helperfuncs.h"
  27 #include "m_sqlv2.h"
  28
  29 /* VERSION 2 API: With nonblocking (threaded) requests */
  30
  31 /* $ModDesc: SQL Service Provider module for all other m_sql* modules */
  32 /* $CompileFlags: `mysql_config --include` */
  33 /* $LinkerFlags: `mysql_config --libs_r` `perl ../mysql_rpath.pl` */
  34
  35
  36 class SQLConnection;
  37 class Notifier;
  38
  39 extern InspIRCd* ServerInstance;
  40 typedef std::map<std::string, SQLConnection*> ConnMap;
  41 bool giveup = false;
  42 static Module* SQLModule = NULL;
  43 static Notifier* MessagePipe = NULL;
  44 int QueueFD = -1;
  45
  46
  47 #if !defined(MYSQL_VERSION_ID) || MYSQL_VERSION_ID<32224
  48 #define mysql_field_count mysql_num_fields
  49 #endif
  50
  51 typedef std::deque<SQLresult*> ResultQueue;
  52
  53 class QueryQueue : public classbase
  54 {
  55 private:
  56         typedef std::deque<SQLrequest> ReqDeque;
  57
  58         ReqDeque priority;      /* The priority queue */
  59         ReqDeque normal;        /* The 'normal' queue */
  60         enum { PRI, NOR, NON } which;   /* Which queue the currently active element is at the front of */
  61
  62 public:
  63         QueryQueue()
  64         : which(NON)
  65         {
  66         }
  67
  68         void push(const SQLrequest &q)
  69         {
  70                 log(DEBUG, "QueryQueue::push(): Adding %s query to queue: %s", ((q.pri) ? "priority" : "non-priority"), q.query.q.c_str());
  71
  72                 if(q.pri)
  73                         priority.push_back(q);
  74                 else
  75                         normal.push_back(q);
  76         }
  77
  78         void pop()
  79         {
  80                 if((which == PRI) && priority.size())
  81                 {
  82                         priority.pop_front();
  83                 }
  84                 else if((which == NOR) && normal.size())
  85                 {
  86                         normal.pop_front();
  87                 }
  88
  89                 /* Reset this */
  90                 which = NON;
  91
  92                 /* Silently do nothing if there was no element to pop() */
  93         }
  94
  95         SQLrequest& front()
  96         {
  97                 switch(which)
  98                 {
  99                         case PRI:
 100                                 return priority.front();
 101                         case NOR:
 102                                 return normal.front();
 103                         default:
 104                                 if(priority.size())
 105                                 {
 106                                         which = PRI;
 107                                         return priority.front();
 108                                 }
 109
 110                                 if(normal.size())
 111                                 {
 112                                         which = NOR;
 113                                         return normal.front();
 114                                 }
 115
 116                                 /* This will probably result in a segfault,
 117                                  * but the caller should have checked totalsize()
 118                                  * first so..meh - moron :p
 119                                  */
 120
 121                                 return priority.front();
 122                 }
 123         }
 124
 125         std::pair<int, int> size()
 126         {
 127                 return std::make_pair(priority.size(), normal.size());
 128         }
 129
 130         int totalsize()
 131         {
 132                 return priority.size() + normal.size();
 133         }
 134
 135         void PurgeModule(Module* mod)
 136         {
 137                 DoPurgeModule(mod, priority);
 138                 DoPurgeModule(mod, normal);
 139         }
 140
 141 private:
 142         void DoPurgeModule(Module* mod, ReqDeque& q)
 143         {
 144                 for(ReqDeque::iterator iter = q.begin(); iter != q.end(); iter++)
 145                 {
 146                         if(iter->GetSource() == mod)
 147                         {
 148                                 if(iter->id == front().id)
 149                                 {
 150                                         /* It's the currently active query.. :x */
 151                                         iter->SetSource(NULL);
 152                                 }
 153                                 else
 154                                 {
 155                                         /* It hasn't been executed yet..just remove it */
 156                                         iter = q.erase(iter);
 157                                 }
 158                         }
 159                 }
 160         }
 161 };
 162
 163 /* A mutex to wrap around queue accesses */
 164 pthread_mutex_t queue_mutex = PTHREAD_MUTEX_INITIALIZER;
 165
 166 pthread_mutex_t results_mutex = PTHREAD_MUTEX_INITIALIZER;
 167
 168 class MySQLresult : public SQLresult
 169 {
 170         int currentrow;
 171         //std::vector<std::map<std::string,std::string> > results;
 172         std::vector<std::string> colnames;
 173         std::vector<SQLfieldList> fieldlists;
 174         SQLfieldMap* fieldmap;
 175         int rows;
 176         int cols;
 177  public:
 178
 179         MySQLresult(Module* self, Module* to, MYSQL_RES* res, int affected_rows) : SQLresult(self, to), currentrow(0), fieldmap(NULL)
 180         {
 181                 /* A number of affected rows from from mysql_affected_rows.
 182                  */
 183                 log(DEBUG,"Created new MySQLresult of non-error type");
 184                 fieldlists.clear();
 185                 rows = 0;
 186                 if (affected_rows >= 1)
 187                 {
 188                         rows = affected_rows;
 189                         fieldlists.resize(rows);
 190                 }
 191                 unsigned int field_count;
 192                 if (res)
 193                 {
 194                         MYSQL_ROW row;
 195                         int n = 0;
 196                         while ((row = mysql_fetch_row(res)))
 197                         {
 198                                 if (fieldlists.size() < (unsigned int)rows+1)
 199                                 {
 200                                         fieldlists.resize(fieldlists.size()+1);
 201                                 }
 202                                 field_count = 0;
 203                                 MYSQL_FIELD *fields = mysql_fetch_fields(res);
 204                                 if(mysql_num_fields(res) == 0)
 205                                         break;
 206                                 if (fields && mysql_num_fields(res))
 207                                 {
 208                                         colnames.clear();
 209                                         while (field_count < mysql_num_fields(res))
 210                                         {
 211                                                 std::string a = (fields[field_count].name ? fields[field_count].name : "");
 212                                                 std::string b = (row[field_count] ? row[field_count] : "");
 213                                                 SQLfield sqlf(b, !row[field_count]);
 214                                                 colnames.push_back(a);
 215                                                 fieldlists[n].push_back(sqlf);
 216                                                 field_count++;
 217                                         }
 218                                         n++;
 219                                 }
 220                                 rows++;
 221                         }
 222                         cols = mysql_num_fields(res);
 223                         mysql_free_result(res);
 224                 }
 225                 cols = field_count;
 226                 log(DEBUG, "Created new MySQL result; %d rows, %d columns", rows, cols);
 227         }
 228
 229         MySQLresult(Module* self, Module* to, SQLerror e) : SQLresult(self, to), currentrow(0)
 230         {
 231                 rows = 0;
 232                 cols = 0;
 233                 error = e;
 234                 log(DEBUG,"Created new MySQLresult of error type");
 235         }
 236
 237         ~MySQLresult()
 238         {
 239         }
 240
 241         virtual int Rows()
 242         {
 243                 return rows;
 244         }
 245
 246         virtual int Cols()
 247         {
 248                 return cols;
 249         }
 250
 251         virtual std::string ColName(int column)
 252         {
 253                 if (column < (int)colnames.size())
 254                 {
 255                         return colnames[column];
 256                 }
 257                 else
 258                 {
 259                         throw SQLbadColName();
 260                 }
 261                 return "";
 262         }
 263
 264         virtual int ColNum(const std::string &column)
 265         {
 266                 for (unsigned int i = 0; i < colnames.size(); i++)
 267                 {
 268                         if (column == colnames[i])
 269                                 return i;
 270                 }
 271                 throw SQLbadColName();
 272                 return 0;
 273         }
 274
 275         virtual SQLfield GetValue(int row, int column)
 276         {
 277                 if ((row >= 0) && (row < rows) && (column >= 0) && (column < cols))
 278                 {
 279                         return fieldlists[row][column];
 280                 }
 281
 282                 log(DEBUG,"Danger will robinson, we don't have row %d, column %d!", row, column);
 283                 throw SQLbadColName();
 284
 285                 /* XXX: We never actually get here because of the throw */
 286                 return SQLfield("",true);
 287         }
 288
 289         virtual SQLfieldList& GetRow()
 290         {
 291                 return fieldlists[currentrow];
 292         }
 293
 294         virtual SQLfieldMap& GetRowMap()
 295         {
 296                 fieldmap = new SQLfieldMap();
 297
 298                 for (int i = 0; i < cols; i++)
 299                 {
 300                         fieldmap->insert(std::make_pair(colnames[cols],GetValue(currentrow, i)));
 301                 }
 302                 currentrow++;
 303
 304                 return *fieldmap;
 305         }
 306
 307         virtual SQLfieldList* GetRowPtr()
 308         {
 309                 return &fieldlists[currentrow++];
 310         }
 311
 312         virtual SQLfieldMap* GetRowMapPtr()
 313         {
 314                 fieldmap = new SQLfieldMap();
 315
 316                 for (int i = 0; i < cols; i++)
 317                 {
 318                         fieldmap->insert(std::make_pair(colnames[cols],GetValue(currentrow, i)));
 319                 }
 320                 currentrow++;
 321
 322                 return fieldmap;
 323         }
 324
 325         virtual void Free(SQLfieldMap* fm)
 326         {
 327                 delete fm;
 328         }
 329
 330         virtual void Free(SQLfieldList* fl)
 331         {
 332                 /* XXX: Yes, this is SUPPOSED to do nothing, we
 333                  * dont want to free our fieldlist until we
 334                  * destruct the object. Unlike the pgsql module,
 335                  * we only have the one.
 336                  */
 337         }
 338 };
 339
 340 class SQLConnection;
 341
 342 void NotifyMainThread(SQLConnection* connection_with_new_result);
 343
 344 class SQLConnection : public classbase
 345 {
 346  protected:
 347
 348         MYSQL connection;
 349         MYSQL_RES *res;
 350         MYSQL_ROW row;
 351         std::string host;
 352         std::string user;
 353         std::string pass;
 354         std::string db;
 355         std::map<std::string,std::string> thisrow;
 356         bool Enabled;
 357         std::string id;
 358
 359  public:
 360
 361         QueryQueue queue;
 362         ResultQueue rq;
 363
 364         // This constructor creates an SQLConnection object with the given credentials, and creates the underlying
 365         // MYSQL struct, but does not connect yet.
 366         SQLConnection(std::string thishost, std::string thisuser, std::string thispass, std::string thisdb, const std::string &myid)
 367         {
 368                 this->Enabled = true;
 369                 this->host = thishost;
 370                 this->user = thisuser;
 371                 this->pass = thispass;
 372                 this->db = thisdb;
 373                 this->id = myid;
 374         }
 375
 376         // This method connects to the database using the credentials supplied to the constructor, and returns
 377         // true upon success.
 378         bool Connect()
 379         {
 380                 unsigned int timeout = 1;
 381                 mysql_init(&connection);
 382                 mysql_options(&connection,MYSQL_OPT_CONNECT_TIMEOUT,(char*)&timeout);
 383                 return mysql_real_connect(&connection, host.c_str(), user.c_str(), pass.c_str(), db.c_str(), 0, NULL, 0);
 384         }
 385
 386         void DoLeadingQuery()
 387         {
 388                 /* Parse the command string and dispatch it to mysql */
 389                 SQLrequest& req = queue.front();
 390                 log(DEBUG,"DO QUERY: %s",req.query.q.c_str());
 391
 392                 /* Pointer to the buffer we screw around with substitution in */
 393                 char* query;
 394
 395                 /* Pointer to the current end of query, where we append new stuff */
 396                 char* queryend;
 397
 398                 /* Total length of the unescaped parameters */
 399                 unsigned long paramlen;
 400
 401                 /* Total length of query, used for binary-safety in mysql_real_query */
 402                 unsigned long querylength = 0;
 403
 404                 paramlen = 0;
 405
 406                 for(ParamL::iterator i = req.query.p.begin(); i != req.query.p.end(); i++)
 407                 {
 408                         paramlen += i->size();
 409                 }
 410
 411                 /* To avoid a lot of allocations, allocate enough memory for the biggest the escaped query could possibly be.
 412                  * sizeofquery + (totalparamlength*2) + 1
 413                  *
 414                  * The +1 is for null-terminating the string for mysql_real_escape_string
 415                  */
 416
 417                 query = new char[req.query.q.length() + (paramlen*2)];
 418                 queryend = query;
 419
 420                 /* Okay, now we have a buffer large enough we need to start copying the query into it and escaping and substituting
 421                  * the parameters into it...
 422                  */
 423
 424                 for(unsigned long i = 0; i < req.query.q.length(); i++)
 425                 {
 426                         if(req.query.q[i] == '?')
 427                         {
 428                                 /* We found a place to substitute..what fun.
 429                                  * use mysql calls to escape and write the
 430                                  * escaped string onto the end of our query buffer,
 431                                  * then we "just" need to make sure queryend is
 432                                  * pointing at the right place.
 433                                  */
 434                                 if(req.query.p.size())
 435                                 {
 436                                         unsigned long len = mysql_real_escape_string(&connection, queryend, req.query.p.front().c_str(), req.query.p.front().length());
 437
 438                                         queryend += len;
 439                                         req.query.p.pop_front();
 440                                 }
 441                                 else
 442                                 {
 443                                         log(DEBUG, "Found a substitution location but no parameter to substitute :|");
 444                                         break;
 445                                 }
 446                         }
 447                         else
 448                         {
 449                                 *queryend = req.query.q[i];
 450                                 queryend++;
 451                         }
 452                         querylength++;
 453                 }
 454
 455                 *queryend = 0;
 456
 457                 log(DEBUG, "Attempting to dispatch query: %s", query);
 458
 459                 pthread_mutex_lock(&queue_mutex);
 460                 req.query.q = query;
 461                 pthread_mutex_unlock(&queue_mutex);
 462
 463                 if (!mysql_real_query(&connection, req.query.q.data(), req.query.q.length()))
 464                 {
 465                         /* Successfull query */
 466                         res = mysql_use_result(&connection);
 467                         unsigned long rows = mysql_affected_rows(&connection);
 468                         MySQLresult* r = new MySQLresult(SQLModule, req.GetSource(), res, rows);
 469                         r->dbid = this->GetID();
 470                         r->query = req.query.q;
 471                         /* Put this new result onto the results queue.
 472                          * XXX: Remember to mutex the queue!
 473                          */
 474                         pthread_mutex_lock(&results_mutex);
 475                         rq.push_back(r);
 476                         pthread_mutex_unlock(&results_mutex);
 477                 }
 478                 else
 479                 {
 480                         /* XXX: See /usr/include/mysql/mysqld_error.h for a list of
 481                          * possible error numbers and error messages */
 482                         log(DEBUG,"SQL ERROR: %s",mysql_error(&connection));
 483                         SQLerror e((SQLerrorNum)mysql_errno(&connection), mysql_error(&connection));
 484                         MySQLresult* r = new MySQLresult(SQLModule, req.GetSource(), e);
 485                         r->dbid = this->GetID();
 486                         r->query = req.query.q;
 487
 488                         pthread_mutex_lock(&results_mutex);
 489                         rq.push_back(r);
 490                         pthread_mutex_unlock(&results_mutex);
 491                 }
 492
 493                 /* Now signal the main thread that we've got a result to process.
 494                  * Pass them this connection id as what to examine
 495                  */
 496
 497                 NotifyMainThread(this);
 498         }
 499
 500         bool ConnectionLost()
 501         {
 502                 if (&connection) {
 503                         return (mysql_ping(&connection) != 0);
 504                 }
 505                 else return false;
 506         }
 507
 508         bool CheckConnection()
 509         {
 510                 if (ConnectionLost()) {
 511                         return Connect();
 512                 }
 513                 else return true;
 514         }
 515
 516         std::string GetError()
 517         {
 518                 return mysql_error(&connection);
 519         }
 520
 521         const std::string& GetID()
 522         {
 523                 return id;
 524         }
 525
 526         std::string GetHost()
 527         {
 528                 return host;
 529         }
 530
 531         void SetEnable(bool Enable)
 532         {
 533                 Enabled = Enable;
 534         }
 535
 536         bool IsEnabled()
 537         {
 538                 return Enabled;
 539         }
 540
 541 };
 542
 543 ConnMap Connections;
 544
 545 void ConnectDatabases(Server* Srv)
 546 {
 547         for (ConnMap::iterator i = Connections.begin(); i != Connections.end(); i++)
 548         {
 549                 i->second->SetEnable(true);
 550                 if (i->second->Connect())
 551                 {
 552                         Srv->Log(DEFAULT,"SQL: Successfully connected database "+i->second->GetHost());
 553                 }
 554                 else
 555                 {
 556                         Srv->Log(DEFAULT,"SQL: Failed to connect database "+i->second->GetHost()+": Error: "+i->second->GetError());
 557                         i->second->SetEnable(false);
 558                 }
 559         }
 560 }
 561
 562
 563 void LoadDatabases(ConfigReader* ThisConf, Server* Srv)
 564 {
 565         Srv->Log(DEFAULT,"SQL: Loading database settings");
 566         Connections.clear();
 567         Srv->Log(DEBUG,"Cleared connections");
 568         for (int j =0; j < ThisConf->Enumerate("database"); j++)
 569         {
 570                 std::string db = ThisConf->ReadValue("database","name",j);
 571                 std::string user = ThisConf->ReadValue("database","username",j);
 572                 std::string pass = ThisConf->ReadValue("database","password",j);
 573                 std::string host = ThisConf->ReadValue("database","hostname",j);
 574                 std::string id = ThisConf->ReadValue("database","id",j);
 575                 Srv->Log(DEBUG,"Read database settings");
 576                 if ((db != "") && (host != "") && (user != "") && (id != "") && (pass != ""))
 577                 {
 578                         SQLConnection* ThisSQL = new SQLConnection(host,user,pass,db,id);
 579                         Srv->Log(DEFAULT,"Loaded database: "+ThisSQL->GetHost());
 580                         Connections[id] = ThisSQL;
 581                         Srv->Log(DEBUG,"Pushed back connection");
 582                 }
 583         }
 584         ConnectDatabases(Srv);
 585 }
 586
 587 void NotifyMainThread(SQLConnection* connection_with_new_result)
 588 {
 589         /* Here we write() to the socket the main thread has open
 590          * and we connect()ed back to before our thread became active.
 591          * The main thread is using a nonblocking socket tied into
 592          * the socket engine, so they wont block and they'll receive
 593          * nearly instant notification. Because we're in a seperate
 594          * thread, we can just use standard connect(), and we can
 595          * block if we like. We just send the connection id of the
 596          * connection back.
 597          */
 598         log(DEBUG,"Notify of result on connection: %s",connection_with_new_result->GetID().c_str());
 599         if (send(QueueFD, connection_with_new_result->GetID().c_str(), connection_with_new_result->GetID().length()+1, 0) < 1) // add one for null terminator
 600         {
 601                 log(DEBUG,"Error writing to QueueFD: %s",strerror(errno));
 602         }
 603         log(DEBUG,"Sent it on its way via fd=%d",QueueFD);
 604 }
 605
 606 void* DispatcherThread(void* arg);
 607
 608 class Notifier : public InspSocket
 609 {
 610         sockaddr_in sock_us;
 611         socklen_t uslen;
 612         Server* Srv;
 613
 614  public:
 615
 616         /* Create a socket on a random port. Let the tcp stack allocate us an available port */
 617         Notifier(Server* S) : InspSocket("127.0.0.1", 0, true, 3000), Srv(S)
 618         {
 619                 uslen = sizeof(sock_us);
 620                 if (getsockname(this->fd,(sockaddr*)&sock_us,&uslen))
 621                 {
 622                         throw ModuleException("Could not create random listening port on localhost");
 623                 }
 624         }
 625
 626         Notifier(int newfd, char* ip, Server* S) : InspSocket(newfd, ip), Srv(S)
 627         {
 628                 log(DEBUG,"Constructor of new socket");
 629         }
 630
 631         /* Using getsockname and ntohs, we can determine which port number we were allocated */
 632         int GetPort()
 633         {
 634                 return ntohs(sock_us.sin_port);
 635         }
 636
 637         virtual int OnIncomingConnection(int newsock, char* ip)
 638         {
 639                 log(DEBUG,"Inbound connection on fd %d!",newsock);
 640                 Notifier* n = new Notifier(newsock, ip, Srv);
 641                 Srv->AddSocket(n);
 642                 return true;
 643         }
 644
 645         virtual bool OnDataReady()
 646         {
 647                 log(DEBUG,"Inbound data!");
 648                 char* data = this->Read();
 649                 ConnMap::iterator iter;
 650
 651                 if (data && *data)
 652                 {
 653                         log(DEBUG,"Looking for connection %s",data);
 654                         /* We expect to be sent a null terminated string */
 655                         if((iter = Connections.find(data)) != Connections.end())
 656                         {
 657                                 log(DEBUG,"Found it!");
 658
 659                                 /* Lock the mutex, send back the data */
 660                                 pthread_mutex_lock(&results_mutex);
 661                                 ResultQueue::iterator n = iter->second->rq.begin();
 662                                 (*n)->Send();
 663                                 iter->second->rq.pop_front();
 664                                 pthread_mutex_unlock(&results_mutex);
 665                                 return true;
 666                         }
 667                 }
 668
 669                 return false;
 670         }
 671 };
 672
 673 class ModuleSQL : public Module
 674 {
 675  public:
 676         Server *Srv;
 677         ConfigReader *Conf;
 678         pthread_t Dispatcher;
 679         int currid;
 680
 681         void Implements(char* List)
 682         {
 683                 List[I_OnRehash] = List[I_OnRequest] = 1;
 684         }
 685
 686         unsigned long NewID()
 687         {
 688                 if (currid+1 == 0)
 689                         currid++;
 690                 return ++currid;
 691         }
 692
 693         char* OnRequest(Request* request)
 694         {
 695                 if(strcmp(SQLREQID, request->GetData()) == 0)
 696                 {
 697                         SQLrequest* req = (SQLrequest*)request;
 698
 699                         /* XXX: Lock */
 700                         pthread_mutex_lock(&queue_mutex);
 701
 702                         ConnMap::iterator iter;
 703
 704                         char* returnval = NULL;
 705
 706                         log(DEBUG, "Got query: '%s' with %d replacement parameters on id '%s'", req->query.q.c_str(), req->query.p.size(), req->dbid.c_str());
 707
 708                         if((iter = Connections.find(req->dbid)) != Connections.end())
 709                         {
 710                                 iter->second->queue.push(*req);
 711                                 req->id = NewID();
 712                                 returnval = SQLSUCCESS;
 713                         }
 714                         else
 715                         {
 716                                 req->error.Id(BAD_DBID);
 717                         }
 718
 719                         pthread_mutex_unlock(&queue_mutex);
 720                         /* XXX: Unlock */
 721
 722                         return returnval;
 723                 }
 724
 725                 log(DEBUG, "Got unsupported API version string: %s", request->GetData());
 726
 727                 return NULL;
 728         }
 729
 730         ModuleSQL(Server* Me)
 731                 : Module::Module(Me)
 732         {
 733                 Srv = Me;
 734                 Conf = new ConfigReader();
 735                 currid = 0;
 736                 SQLModule = this;
 737
 738                 MessagePipe = new Notifier(Srv);
 739                 Srv->AddSocket(MessagePipe);
 740                 log(DEBUG,"Bound notifier to 127.0.0.1:%d",MessagePipe->GetPort());
 741
 742                 pthread_attr_t attribs;
 743                 pthread_attr_init(&attribs);
 744                 pthread_attr_setdetachstate(&attribs, PTHREAD_CREATE_DETACHED);
 745                 if (pthread_create(&this->Dispatcher, &attribs, DispatcherThread, (void *)this) != 0)
 746                 {
 747                         throw ModuleException("m_mysql: Failed to create dispatcher thread: " + std::string(strerror(errno)));
 748                 }
 749                 Srv->PublishFeature("SQL", this);
 750                 Srv->PublishFeature("MySQL", this);
 751         }
 752
 753         virtual ~ModuleSQL()
 754         {
 755                 DELETE(Conf);
 756         }
 757
 758         virtual void OnRehash(const std::string &parameter)
 759         {
 760                 /* TODO: set rehash bool here, which makes the dispatcher thread rehash at next opportunity */
 761         }
 762
 763         virtual Version GetVersion()
 764         {
 765                 return Version(1,1,0,0,VF_VENDOR|VF_SERVICEPROVIDER);
 766         }
 767
 768 };
 769
 770 void* DispatcherThread(void* arg)
 771 {
 772         log(DEBUG,"Starting Dispatcher thread, mysql version %d",mysql_get_client_version());
 773         ModuleSQL* thismodule = (ModuleSQL*)arg;
 774         LoadDatabases(thismodule->Conf, thismodule->Srv);
 775
 776         /* Connect back to the Notifier */
 777
 778         if ((QueueFD = socket(AF_INET, SOCK_STREAM, 0)) == -1)
 779         {
 780                 /* crap, we're out of sockets... */
 781                 log(DEBUG,"QueueFD cant be created");
 782                 return NULL;
 783         }
 784
 785         log(DEBUG,"Initialize QueueFD to %d",QueueFD);
 786
 787         sockaddr_in addr;
 788         in_addr ia;
 789         inet_aton("127.0.0.1", &ia);
 790         addr.sin_family = AF_INET;
 791         addr.sin_addr = ia;
 792         addr.sin_port = htons(MessagePipe->GetPort());
 793
 794         if (connect(QueueFD, (sockaddr*)&addr,sizeof(addr)) == -1)
 795         {
 796                 /* wtf, we cant connect to it, but we just created it! */
 797                 log(DEBUG,"QueueFD cant connect!");
 798                 return NULL;
 799         }
 800
 801         log(DEBUG,"Connect QUEUE FD");
 802
 803         while (!giveup)
 804         {
 805                 SQLConnection* conn = NULL;
 806                 /* XXX: Lock here for safety */
 807                 pthread_mutex_lock(&queue_mutex);
 808                 for (ConnMap::iterator i = Connections.begin(); i != Connections.end(); i++)
 809                 {
 810                         if (i->second->queue.totalsize())
 811                         {
 812                                 conn = i->second;
 813                                 break;
 814                         }
 815                 }
 816                 pthread_mutex_unlock(&queue_mutex);
 817                 /* XXX: Unlock */
 818
 819                 /* Theres an item! */
 820                 if (conn)
 821                 {
 822                         log(DEBUG,"Process Leading query");
 823                         conn->DoLeadingQuery();
 824
 825                         /* XXX: Lock */
 826                         pthread_mutex_lock(&queue_mutex);
 827                         conn->queue.pop();
 828                         pthread_mutex_unlock(&queue_mutex);
 829                         /* XXX: Unlock */
 830                 }
 831
 832                 usleep(50);
 833         }
 834
 835         return NULL;
 836 }
 837
 838
 839 // stuff down here is the module-factory stuff. For basic modules you can ignore this.
 840
 841 class ModuleSQLFactory : public ModuleFactory
 842 {
 843  public:
 844         ModuleSQLFactory()
 845         {
 846         }
 847
 848         ~ModuleSQLFactory()
 849         {
 850         }
 851
 852         virtual Module * CreateModule(Server* Me)
 853         {
 854                 return new ModuleSQL(Me);
 855         }
 856
 857 };
 858
 859
 860 extern "C" void * init_module( void )
 861 {
 862         return new ModuleSQLFactory;
 863 }
 864