src/modules/extra/m_mysql.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 /* Stop mysql wanting to use long long */
  15 #define NO_CLIENT_LONG_LONG
  16
  17 #include "inspircd.h"
  18 #include <mysql.h>
  19 #include <pthread.h>
  20 #include "users.h"
  21 #include "channels.h"
  22 #include "modules.h"
  23 #include "m_sqlv2.h"
  24
  25 /* VERSION 2 API: With nonblocking (threaded) requests */
  26
  27 /* $ModDesc: SQL Service Provider module for all other m_sql* modules */
  28 /* $CompileFlags: exec("mysql_config --include") */
  29 /* $LinkerFlags: exec("mysql_config --libs_r") rpath("mysql_config --libs_r") */
  30 /* $ModDep: m_sqlv2.h */
  31
  32 /* THE NONBLOCKING MYSQL API!
  33  *
  34  * MySQL provides no nonblocking (asyncronous) API of its own, and its developers recommend
  35  * that instead, you should thread your program. This is what i've done here to allow for
  36  * asyncronous SQL requests via mysql. The way this works is as follows:
  37  *
  38  * The module spawns a thread via pthreads, and performs its mysql queries in this thread,
  39  * using a queue with priorities. There is a mutex on either end which prevents two threads
  40  * adjusting the queue at the same time, and crashing the ircd. Every 50 milliseconds, the
  41  * worker thread wakes up, and checks if there is a request at the head of its queue.
  42  * If there is, it processes this request, blocking the worker thread but leaving the ircd
  43  * thread to go about its business as usual. During this period, the ircd thread is able
  44  * to insert futher pending requests into the queue.
  45  *
  46  * Once the processing of a request is complete, it is removed from the incoming queue to
  47  * an outgoing queue, and initialized as a 'response'. The worker thread then signals the
  48  * ircd thread (via a loopback socket) of the fact a result is available, by sending the
  49  * connection ID through the connection.
  50  *
  51  * The ircd thread then mutexes the queue once more, reads the outbound response off the head
  52  * of the queue, and sends it on its way to the original calling module.
  53  *
  54  * XXX: You might be asking "why doesnt he just send the response from within the worker thread?"
  55  * The answer to this is simple. The majority of InspIRCd, and in fact most ircd's are not
  56  * threadsafe. This module is designed to be threadsafe and is careful with its use of threads,
  57  * however, if we were to call a module's OnRequest even from within a thread which was not the
  58  * one the module was originally instantiated upon, there is a chance of all hell breaking loose
  59  * if a module is ever put in a re-enterant state (stack corruption could occur, crashes, data
  60  * corruption, and worse, so DONT think about it until the day comes when InspIRCd is 100%
  61  * gauranteed threadsafe!)
  62  *
  63  * For a diagram of this system please see http://www.inspircd.org/wiki/Mysql2
  64  */
  65
  66
  67 class SQLConnection;
  68 class Notifier;
  69
  70
  71 typedef std::map<std::string, SQLConnection*> ConnMap;
  72 bool giveup = false;
  73 bool threadfinished = false;
  74 static Module* SQLModule = NULL;
  75 static Notifier* MessagePipe = NULL;
  76 int QueueFD = -1;
  77
  78
  79 #if !defined(MYSQL_VERSION_ID) || MYSQL_VERSION_ID<32224
  80 #define mysql_field_count mysql_num_fields
  81 #endif
  82
  83 typedef std::deque<SQLresult*> ResultQueue;
  84
  85 /* A mutex to wrap around queue accesses */
  86 pthread_mutex_t queue_mutex = PTHREAD_MUTEX_INITIALIZER;
  87
  88 pthread_mutex_t results_mutex = PTHREAD_MUTEX_INITIALIZER;
  89
  90 pthread_mutex_t logging_mutex = PTHREAD_MUTEX_INITIALIZER;
  91
  92 /** Represents a mysql result set
  93  */
  94 class MySQLresult : public SQLresult
  95 {
  96         int currentrow;
  97         std::vector<std::string> colnames;
  98         std::vector<SQLfieldList> fieldlists;
  99         SQLfieldMap* fieldmap;
 100         SQLfieldMap fieldmap2;
 101         SQLfieldList emptyfieldlist;
 102         int rows;
 103  public:
 104
 105         MySQLresult(Module* self, Module* to, MYSQL_RES* res, int affected_rows, unsigned int rid) : SQLresult(self, to, rid), currentrow(0), fieldmap(NULL)
 106         {
 107                 /* A number of affected rows from from mysql_affected_rows.
 108                  */
 109                 fieldlists.clear();
 110                 rows = 0;
 111                 if (affected_rows >= 1)
 112                 {
 113                         rows = affected_rows;
 114                         fieldlists.resize(rows);
 115                 }
 116                 unsigned int field_count = 0;
 117                 if (res)
 118                 {
 119                         MYSQL_ROW row;
 120                         int n = 0;
 121                         while ((row = mysql_fetch_row(res)))
 122                         {
 123                                 if (fieldlists.size() < (unsigned int)rows+1)
 124                                 {
 125                                         fieldlists.resize(fieldlists.size()+1);
 126                                 }
 127                                 field_count = 0;
 128                                 MYSQL_FIELD *fields = mysql_fetch_fields(res);
 129                                 if(mysql_num_fields(res) == 0)
 130                                         break;
 131                                 if (fields && mysql_num_fields(res))
 132                                 {
 133                                         colnames.clear();
 134                                         while (field_count < mysql_num_fields(res))
 135                                         {
 136                                                 std::string a = (fields[field_count].name ? fields[field_count].name : "");
 137                                                 std::string b = (row[field_count] ? row[field_count] : "");
 138                                                 SQLfield sqlf(b, !row[field_count]);
 139                                                 colnames.push_back(a);
 140                                                 fieldlists[n].push_back(sqlf);
 141                                                 field_count++;
 142                                         }
 143                                         n++;
 144                                 }
 145                                 rows++;
 146                         }
 147                         mysql_free_result(res);
 148                 }
 149         }
 150
 151         MySQLresult(Module* self, Module* to, SQLerror e, unsigned int rid) : SQLresult(self, to, rid), currentrow(0)
 152         {
 153                 rows = 0;
 154                 error = e;
 155         }
 156
 157         ~MySQLresult()
 158         {
 159         }
 160
 161         virtual int Rows()
 162         {
 163                 return rows;
 164         }
 165
 166         virtual int Cols()
 167         {
 168                 return colnames.size();
 169         }
 170
 171         virtual std::string ColName(int column)
 172         {
 173                 if (column < (int)colnames.size())
 174                 {
 175                         return colnames[column];
 176                 }
 177                 else
 178                 {
 179                         throw SQLbadColName();
 180                 }
 181                 return "";
 182         }
 183
 184         virtual int ColNum(const std::string &column)
 185         {
 186                 for (unsigned int i = 0; i < colnames.size(); i++)
 187                 {
 188                         if (column == colnames[i])
 189                                 return i;
 190                 }
 191                 throw SQLbadColName();
 192                 return 0;
 193         }
 194
 195         virtual SQLfield GetValue(int row, int column)
 196         {
 197                 if ((row >= 0) && (row < rows) && (column >= 0) && (column < Cols()))
 198                 {
 199                         return fieldlists[row][column];
 200                 }
 201
 202                 throw SQLbadColName();
 203
 204                 /* XXX: We never actually get here because of the throw */
 205                 return SQLfield("",true);
 206         }
 207
 208         virtual SQLfieldList& GetRow()
 209         {
 210                 if (currentrow < rows)
 211                         return fieldlists[currentrow];
 212                 else
 213                         return emptyfieldlist;
 214         }
 215
 216         virtual SQLfieldMap& GetRowMap()
 217         {
 218                 fieldmap2.clear();
 219
 220                 if (currentrow < rows)
 221                 {
 222                         for (int i = 0; i < Cols(); i++)
 223                         {
 224                                 fieldmap2.insert(std::make_pair(colnames[i],GetValue(currentrow, i)));
 225                         }
 226                         currentrow++;
 227                 }
 228
 229                 return fieldmap2;
 230         }
 231
 232         virtual SQLfieldList* GetRowPtr()
 233         {
 234                 SQLfieldList* fieldlist = new SQLfieldList();
 235
 236                 if (currentrow < rows)
 237                 {
 238                         for (int i = 0; i < Rows(); i++)
 239                         {
 240                                 fieldlist->push_back(fieldlists[currentrow][i]);
 241                         }
 242                         currentrow++;
 243                 }
 244                 return fieldlist;
 245         }
 246
 247         virtual SQLfieldMap* GetRowMapPtr()
 248         {
 249                 fieldmap = new SQLfieldMap();
 250
 251                 if (currentrow < rows)
 252                 {
 253                         for (int i = 0; i < Cols(); i++)
 254                         {
 255                                 fieldmap->insert(std::make_pair(colnames[i],GetValue(currentrow, i)));
 256                         }
 257                         currentrow++;
 258                 }
 259
 260                 return fieldmap;
 261         }
 262
 263         virtual void Free(SQLfieldMap* fm)
 264         {
 265                 delete fm;
 266         }
 267
 268         virtual void Free(SQLfieldList* fl)
 269         {
 270                 delete fl;
 271         }
 272 };
 273
 274 class SQLConnection;
 275
 276 void NotifyMainThread(SQLConnection* connection_with_new_result);
 277
 278 /** Represents a connection to a mysql database
 279  */
 280 class SQLConnection : public classbase
 281 {
 282  protected:
 283
 284         MYSQL connection;
 285         MYSQL_RES *res;
 286         MYSQL_ROW row;
 287         SQLhost host;
 288         std::map<std::string,std::string> thisrow;
 289         bool Enabled;
 290
 291  public:
 292
 293         QueryQueue queue;
 294         ResultQueue rq;
 295
 296         // This constructor creates an SQLConnection object with the given credentials, but does not connect yet.
 297         SQLConnection(const SQLhost &hi) : host(hi), Enabled(false)
 298         {
 299         }
 300
 301         ~SQLConnection()
 302         {
 303                 Close();
 304         }
 305
 306         // This method connects to the database using the credentials supplied to the constructor, and returns
 307         // true upon success.
 308         bool Connect()
 309         {
 310                 unsigned int timeout = 1;
 311                 mysql_init(&connection);
 312                 mysql_options(&connection,MYSQL_OPT_CONNECT_TIMEOUT,(char*)&timeout);
 313                 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);
 314         }
 315
 316         void DoLeadingQuery()
 317         {
 318                 if (!CheckConnection())
 319                         return;
 320
 321                 /* Parse the command string and dispatch it to mysql */
 322                 SQLrequest& req = queue.front();
 323
 324                 /* Pointer to the buffer we screw around with substitution in */
 325                 char* query;
 326
 327                 /* Pointer to the current end of query, where we append new stuff */
 328                 char* queryend;
 329
 330                 /* Total length of the unescaped parameters */
 331                 unsigned long paramlen;
 332
 333                 /* Total length of query, used for binary-safety in mysql_real_query */
 334                 unsigned long querylength = 0;
 335
 336                 paramlen = 0;
 337
 338                 for(ParamL::iterator i = req.query.p.begin(); i != req.query.p.end(); i++)
 339                 {
 340                         paramlen += i->size();
 341                 }
 342
 343                 /* To avoid a lot of allocations, allocate enough memory for the biggest the escaped query could possibly be.
 344                  * sizeofquery + (totalparamlength*2) + 1
 345                  *
 346                  * The +1 is for null-terminating the string for mysql_real_escape_string
 347                  */
 348
 349                 query = new char[req.query.q.length() + (paramlen*2) + 1];
 350                 queryend = query;
 351
 352                 /* Okay, now we have a buffer large enough we need to start copying the query into it and escaping and substituting
 353                  * the parameters into it...
 354                  */
 355
 356                 for(unsigned long i = 0; i < req.query.q.length(); i++)
 357                 {
 358                         if(req.query.q[i] == '?')
 359                         {
 360                                 /* We found a place to substitute..what fun.
 361                                  * use mysql calls to escape and write the
 362                                  * escaped string onto the end of our query buffer,
 363                                  * then we "just" need to make sure queryend is
 364                                  * pointing at the right place.
 365                                  */
 366                                 if(req.query.p.size())
 367                                 {
 368                                         unsigned long len = mysql_real_escape_string(&connection, queryend, req.query.p.front().c_str(), req.query.p.front().length());
 369
 370                                         queryend += len;
 371                                         req.query.p.pop_front();
 372                                 }
 373                                 else
 374                                         break;
 375                         }
 376                         else
 377                         {
 378                                 *queryend = req.query.q[i];
 379                                 queryend++;
 380                         }
 381                         querylength++;
 382                 }
 383
 384                 *queryend = 0;
 385
 386                 pthread_mutex_lock(&queue_mutex);
 387                 req.query.q = query;
 388                 pthread_mutex_unlock(&queue_mutex);
 389
 390                 if (!mysql_real_query(&connection, req.query.q.data(), req.query.q.length()))
 391                 {
 392                         /* Successfull query */
 393                         res = mysql_use_result(&connection);
 394                         unsigned long rows = mysql_affected_rows(&connection);
 395                         MySQLresult* r = new MySQLresult(SQLModule, req.GetSource(), res, rows, req.id);
 396                         r->dbid = this->GetID();
 397                         r->query = req.query.q;
 398                         /* Put this new result onto the results queue.
 399                          * XXX: Remember to mutex the queue!
 400                          */
 401                         pthread_mutex_lock(&results_mutex);
 402                         rq.push_back(r);
 403                         pthread_mutex_unlock(&results_mutex);
 404                 }
 405                 else
 406                 {
 407                         /* XXX: See /usr/include/mysql/mysqld_error.h for a list of
 408                          * possible error numbers and error messages */
 409                         SQLerror e(QREPLY_FAIL, ConvToStr(mysql_errno(&connection)) + std::string(": ") + mysql_error(&connection));
 410                         MySQLresult* r = new MySQLresult(SQLModule, req.GetSource(), e, req.id);
 411                         r->dbid = this->GetID();
 412                         r->query = req.query.q;
 413
 414                         pthread_mutex_lock(&results_mutex);
 415                         rq.push_back(r);
 416                         pthread_mutex_unlock(&results_mutex);
 417                 }
 418
 419                 /* Now signal the main thread that we've got a result to process.
 420                  * Pass them this connection id as what to examine
 421                  */
 422
 423                 delete[] query;
 424
 425                 NotifyMainThread(this);
 426         }
 427
 428         bool ConnectionLost()
 429         {
 430                 if (&connection) {
 431                         return (mysql_ping(&connection) != 0);
 432                 }
 433                 else return false;
 434         }
 435
 436         bool CheckConnection()
 437         {
 438                 if (ConnectionLost()) {
 439                         return Connect();
 440                 }
 441                 else return true;
 442         }
 443
 444         std::string GetError()
 445         {
 446                 return mysql_error(&connection);
 447         }
 448
 449         const std::string& GetID()
 450         {
 451                 return host.id;
 452         }
 453
 454         std::string GetHost()
 455         {
 456                 return host.host;
 457         }
 458
 459         void SetEnable(bool Enable)
 460         {
 461                 Enabled = Enable;
 462         }
 463
 464         bool IsEnabled()
 465         {
 466                 return Enabled;
 467         }
 468
 469         void Close()
 470         {
 471                 mysql_close(&connection);
 472         }
 473
 474         const SQLhost& GetConfHost()
 475         {
 476                 return host;
 477         }
 478
 479 };
 480
 481 ConnMap Connections;
 482
 483 bool HasHost(const SQLhost &host)
 484 {
 485         for (ConnMap::iterator iter = Connections.begin(); iter != Connections.end(); iter++)
 486         {
 487                 if (host == iter->second->GetConfHost())
 488                         return true;
 489         }
 490         return false;
 491 }
 492
 493 bool HostInConf(ConfigReader* conf, const SQLhost &h)
 494 {
 495         for(int i = 0; i < conf->Enumerate("database"); i++)
 496         {
 497                 SQLhost host;
 498                 host.id         = conf->ReadValue("database", "id", i);
 499                 host.host       = conf->ReadValue("database", "hostname", i);
 500                 host.port       = conf->ReadInteger("database", "port", i, true);
 501                 host.name       = conf->ReadValue("database", "name", i);
 502                 host.user       = conf->ReadValue("database", "username", i);
 503                 host.pass       = conf->ReadValue("database", "password", i);
 504                 host.ssl        = conf->ReadFlag("database", "ssl", i);
 505                 if (h == host)
 506                         return true;
 507         }
 508         return false;
 509 }
 510
 511 void ClearOldConnections(ConfigReader* conf)
 512 {
 513         ConnMap::iterator i,safei;
 514         for (i = Connections.begin(); i != Connections.end(); i++)
 515         {
 516                 if (!HostInConf(conf, i->second->GetConfHost()))
 517                 {
 518                         delete i->second;
 519                         safei = i;
 520                         --i;
 521                         Connections.erase(safei);
 522                 }
 523         }
 524 }
 525
 526 void ClearAllConnections()
 527 {
 528         ConnMap::iterator i;
 529         while ((i = Connections.begin()) != Connections.end())
 530         {
 531                 Connections.erase(i);
 532                 delete i->second;
 533         }
 534 }
 535
 536 void ConnectDatabases(InspIRCd* ServerInstance)
 537 {
 538         for (ConnMap::iterator i = Connections.begin(); i != Connections.end(); i++)
 539         {
 540                 if (i->second->IsEnabled())
 541                         continue;
 542
 543                 i->second->SetEnable(true);
 544                 if (!i->second->Connect())
 545                 {
 546                         /* XXX: MUTEX */
 547                         pthread_mutex_lock(&logging_mutex);
 548                         ServerInstance->Logs->Log("m_mysql",DEFAULT,"SQL: Failed to connect database "+i->second->GetHost()+": Error: "+i->second->GetError());
 549                         i->second->SetEnable(false);
 550                         pthread_mutex_unlock(&logging_mutex);
 551                 }
 552         }
 553 }
 554
 555 void LoadDatabases(ConfigReader* conf, InspIRCd* ServerInstance)
 556 {
 557         ClearOldConnections(conf);
 558         for (int j =0; j < conf->Enumerate("database"); j++)
 559         {
 560                 SQLhost host;
 561                 host.id         = conf->ReadValue("database", "id", j);
 562                 host.host       = conf->ReadValue("database", "hostname", j);
 563                 host.port       = conf->ReadInteger("database", "port", j, true);
 564                 host.name       = conf->ReadValue("database", "name", j);
 565                 host.user       = conf->ReadValue("database", "username", j);
 566                 host.pass       = conf->ReadValue("database", "password", j);
 567                 host.ssl        = conf->ReadFlag("database", "ssl", j);
 568
 569                 if (HasHost(host))
 570                         continue;
 571
 572                 if (!host.id.empty() && !host.host.empty() && !host.name.empty() && !host.user.empty() && !host.pass.empty())
 573                 {
 574                         SQLConnection* ThisSQL = new SQLConnection(host);
 575                         Connections[host.id] = ThisSQL;
 576                 }
 577         }
 578         ConnectDatabases(ServerInstance);
 579 }
 580
 581 char FindCharId(const std::string &id)
 582 {
 583         char i = 1;
 584         for (ConnMap::iterator iter = Connections.begin(); iter != Connections.end(); ++iter, ++i)
 585         {
 586                 if (iter->first == id)
 587                 {
 588                         return i;
 589                 }
 590         }
 591         return 0;
 592 }
 593
 594 ConnMap::iterator GetCharId(char id)
 595 {
 596         char i = 1;
 597         for (ConnMap::iterator iter = Connections.begin(); iter != Connections.end(); ++iter, ++i)
 598         {
 599                 if (i == id)
 600                         return iter;
 601         }
 602         return Connections.end();
 603 }
 604
 605 void NotifyMainThread(SQLConnection* connection_with_new_result)
 606 {
 607         /* Here we write() to the socket the main thread has open
 608          * and we connect()ed back to before our thread became active.
 609          * The main thread is using a nonblocking socket tied into
 610          * the socket engine, so they wont block and they'll receive
 611          * nearly instant notification. Because we're in a seperate
 612          * thread, we can just use standard connect(), and we can
 613          * block if we like. We just send the connection id of the
 614          * connection back.
 615          *
 616          * NOTE: We only send a single char down the connection, this
 617          * way we know it wont get a partial read at the other end if
 618          * the system is especially congested (see bug #263).
 619          * The function FindCharId translates a connection name into a
 620          * one character id, and GetCharId translates a character id
 621          * back into an iterator.
 622          */
 623         char id = FindCharId(connection_with_new_result->GetID());
 624         send(QueueFD, &id, 1, 0);
 625 }
 626
 627 void* DispatcherThread(void* arg);
 628
 629 /** Used by m_mysql to notify one thread when the other has a result
 630  */
 631 class Notifier : public BufferedSocket
 632 {
 633         insp_sockaddr sock_us;
 634         socklen_t uslen;
 635
 636
 637  public:
 638
 639         /* Create a socket on a random port. Let the tcp stack allocate us an available port */
 640 #ifdef IPV6
 641         Notifier(InspIRCd* SI) : BufferedSocket(SI, "::1", 0, true, 3000)
 642 #else
 643         Notifier(InspIRCd* SI) : BufferedSocket(SI, "127.0.0.1", 0, true, 3000)
 644 #endif
 645         {
 646                 uslen = sizeof(sock_us);
 647                 if (getsockname(this->fd,(sockaddr*)&sock_us,&uslen))
 648                 {
 649                         throw ModuleException("Could not create random listening port on localhost");
 650                 }
 651         }
 652
 653         Notifier(InspIRCd* SI, int newfd, char* ip) : BufferedSocket(SI, newfd, ip)
 654         {
 655         }
 656
 657         /* Using getsockname and ntohs, we can determine which port number we were allocated */
 658         int GetPort()
 659         {
 660 #ifdef IPV6
 661                 return ntohs(sock_us.sin6_port);
 662 #else
 663                 return ntohs(sock_us.sin_port);
 664 #endif
 665         }
 666
 667         virtual int OnIncomingConnection(int newsock, char* ip)
 668         {
 669                 Notifier* n = new Notifier(this->Instance, newsock, ip);
 670                 n = n; /* Stop bitching at me, GCC */
 671                 return true;
 672         }
 673
 674         virtual bool OnDataReady()
 675         {
 676                 char data = 0;
 677                 /* NOTE: Only a single character is read so we know we
 678                  * cant get a partial read. (We've been told that theres
 679                  * data waiting, so we wont ever get EAGAIN)
 680                  * The function GetCharId translates a single character
 681                  * back into an iterator.
 682                  */
 683                 if (Instance->SE->Recv(this, &data, 1, 0) > 0)
 684                 {
 685                         ConnMap::iterator iter = GetCharId(data);
 686                         if (iter != Connections.end())
 687                         {
 688                                 /* Lock the mutex, send back the data */
 689                                 pthread_mutex_lock(&results_mutex);
 690                                 ResultQueue::iterator n = iter->second->rq.begin();
 691                                 (*n)->Send();
 692                                 iter->second->rq.pop_front();
 693                                 pthread_mutex_unlock(&results_mutex);
 694                                 return true;
 695                         }
 696                         /* No error, but unknown id */
 697                         return true;
 698                 }
 699
 700                 /* Erk, error on descriptor! */
 701                 return false;
 702         }
 703 };
 704
 705 /** MySQL module
 706  */
 707 class ModuleSQL : public Module
 708 {
 709  public:
 710
 711         ConfigReader *Conf;
 712         InspIRCd* PublicServerInstance;
 713         pthread_t Dispatcher;
 714         int currid;
 715         bool rehashing;
 716
 717         ModuleSQL(InspIRCd* Me)
 718         : Module::Module(Me), rehashing(false)
 719         {
 720                 ServerInstance->Modules->UseInterface("SQLutils");
 721
 722                 Conf = new ConfigReader(ServerInstance);
 723                 PublicServerInstance = ServerInstance;
 724                 currid = 0;
 725                 SQLModule = this;
 726
 727                 MessagePipe = new Notifier(ServerInstance);
 728
 729                 pthread_attr_t attribs;
 730                 pthread_attr_init(&attribs);
 731                 pthread_attr_setdetachstate(&attribs, PTHREAD_CREATE_JOINABLE);
 732                 if (pthread_create(&this->Dispatcher, &attribs, DispatcherThread, (void *)this) != 0)
 733                 {
 734                         throw ModuleException("m_mysql: Failed to create dispatcher thread: " + std::string(strerror(errno)));
 735                 }
 736                 pthread_attr_destroy(&attribs);
 737
 738                 if (!ServerInstance->Modules->PublishFeature("SQL", this))
 739                 {
 740                         /* Tell worker thread to exit NOW */
 741                         int rc;
 742                         void *status;
 743                         giveup = true;
 744                         rc = pthread_join(Dispatcher, &status);
 745                         if (rc)
 746                         {
 747                                 ServerInstance->Logs->Log("m_mysql",DEFAULT,"SQL: Error code from pthread_join() is %d", rc);
 748                         }
 749                         throw ModuleException("m_mysql: Unable to publish feature 'SQL'");
 750                 }
 751
 752                 ServerInstance->Modules->PublishInterface("SQL", this);
 753                 Implementation eventlist[] = { I_OnRehash, I_OnRequest };
 754                 ServerInstance->Modules->Attach(eventlist, this, 2);
 755         }
 756
 757         virtual ~ModuleSQL()
 758         {
 759                 int rc;
 760                 void *status;
 761                 giveup = true;
 762                 rc = pthread_join(Dispatcher, &status);
 763                 if (rc)
 764                 {
 765                         ServerInstance->Logs->Log("m_mysql",DEFAULT,"SQL: Error code from pthread_join() is %d", rc);
 766                 }
 767                 ClearAllConnections();
 768                 delete Conf;
 769                 ServerInstance->Modules->UnpublishInterface("SQL", this);
 770                 ServerInstance->Modules->UnpublishFeature("SQL");
 771                 ServerInstance->Modules->DoneWithInterface("SQLutils");
 772         }
 773
 774
 775
 776         unsigned long NewID()
 777         {
 778                 if (currid+1 == 0)
 779                         currid++;
 780                 return ++currid;
 781         }
 782
 783         virtual const char* OnRequest(Request* request)
 784         {
 785                 if(strcmp(SQLREQID, request->GetId()) == 0)
 786                 {
 787                         SQLrequest* req = (SQLrequest*)request;
 788
 789                         /* XXX: Lock */
 790                         pthread_mutex_lock(&queue_mutex);
 791
 792                         ConnMap::iterator iter;
 793
 794                         const char* returnval = NULL;
 795
 796                         if((iter = Connections.find(req->dbid)) != Connections.end())
 797                         {
 798                                 req->id = NewID();
 799                                 iter->second->queue.push(*req);
 800                                 returnval = SQLSUCCESS;
 801                         }
 802                         else
 803                         {
 804                                 req->error.Id(BAD_DBID);
 805                         }
 806
 807                         pthread_mutex_unlock(&queue_mutex);
 808                         /* XXX: Unlock */
 809
 810                         return returnval;
 811                 }
 812
 813                 return NULL;
 814         }
 815
 816         virtual void OnRehash(User* user, const std::string &parameter)
 817         {
 818                 rehashing = true;
 819         }
 820
 821         virtual Version GetVersion()
 822         {
 823                 return Version(1,2,0,0,VF_VENDOR|VF_SERVICEPROVIDER,API_VERSION);
 824         }
 825
 826 };
 827
 828 void* DispatcherThread(void* arg)
 829 {
 830         ModuleSQL* thismodule = (ModuleSQL*)arg;
 831         LoadDatabases(thismodule->Conf, thismodule->PublicServerInstance);
 832
 833         /* Connect back to the Notifier */
 834
 835         if ((QueueFD = socket(AF_FAMILY, SOCK_STREAM, 0)) == -1)
 836         {
 837                 /* crap, we're out of sockets... */
 838                 return NULL;
 839         }
 840
 841         insp_sockaddr addr;
 842
 843 #ifdef IPV6
 844         insp_aton("::1", &addr.sin6_addr);
 845         addr.sin6_family = AF_FAMILY;
 846         addr.sin6_port = htons(MessagePipe->GetPort());
 847 #else
 848         insp_inaddr ia;
 849         insp_aton("127.0.0.1", &ia);
 850         addr.sin_family = AF_FAMILY;
 851         addr.sin_addr = ia;
 852         addr.sin_port = htons(MessagePipe->GetPort());
 853 #endif
 854
 855         if (connect(QueueFD, (sockaddr*)&addr,sizeof(addr)) == -1)
 856         {
 857                 /* wtf, we cant connect to it, but we just created it! */
 858                 return NULL;
 859         }
 860
 861         while (!giveup)
 862         {
 863                 if (thismodule->rehashing)
 864                 {
 865                 /* XXX: Lock */
 866                         pthread_mutex_lock(&queue_mutex);
 867                         thismodule->rehashing = false;
 868                         LoadDatabases(thismodule->Conf, thismodule->PublicServerInstance);
 869                         pthread_mutex_unlock(&queue_mutex);
 870                         /* XXX: Unlock */
 871                 }
 872
 873                 SQLConnection* conn = NULL;
 874                 /* XXX: Lock here for safety */
 875                 pthread_mutex_lock(&queue_mutex);
 876                 for (ConnMap::iterator i = Connections.begin(); i != Connections.end(); i++)
 877                 {
 878                         if (i->second->queue.totalsize())
 879                         {
 880                                 conn = i->second;
 881                                 break;
 882                         }
 883                 }
 884                 pthread_mutex_unlock(&queue_mutex);
 885                 /* XXX: Unlock */
 886
 887                 /* Theres an item! */
 888                 if (conn)
 889                 {
 890                         conn->DoLeadingQuery();
 891
 892                         /* XXX: Lock */
 893                         pthread_mutex_lock(&queue_mutex);
 894                         conn->queue.pop();
 895                         pthread_mutex_unlock(&queue_mutex);
 896                         /* XXX: Unlock */
 897                 }
 898
 899                 usleep(1000);
 900         }
 901
 902         pthread_exit((void *) 0);
 903 }
 904
 905 MODULE_INIT(ModuleSQL)