src/modules/extra/m_mysql.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 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 #include "inspircd.h"
  15 #include <mysql.h>
  16 #include <pthread.h>
  17 #include "users.h"
  18 #include "channels.h"
  19 #include "modules.h"
  20 #include "m_sqlv2.h"
  21
  22 /* VERSION 2 API: With nonblocking (threaded) requests */
  23
  24 /* $ModDesc: SQL Service Provider module for all other m_sql* modules */
  25 /* $CompileFlags: exec("mysql_config --include") */
  26 /* $LinkerFlags: exec("mysql_config --libs_r") rpath("mysql_config --libs_r") */
  27 /* $ModDep: m_sqlv2.h */
  28 /* $NoPedantic */
  29
  30 /* THE NONBLOCKING MYSQL API!
  31  *
  32  * MySQL provides no nonblocking (asyncronous) API of its own, and its developers recommend
  33  * that instead, you should thread your program. This is what i've done here to allow for
  34  * asyncronous SQL requests via mysql. The way this works is as follows:
  35  *
  36  * The module spawns a thread via pthreads, and performs its mysql queries in this thread,
  37  * using a queue with priorities. There is a mutex on either end which prevents two threads
  38  * adjusting the queue at the same time, and crashing the ircd. Every 50 milliseconds, the
  39  * worker thread wakes up, and checks if there is a request at the head of its queue.
  40  * If there is, it processes this request, blocking the worker thread but leaving the ircd
  41  * thread to go about its business as usual. During this period, the ircd thread is able
  42  * to insert futher pending requests into the queue.
  43  *
  44  * Once the processing of a request is complete, it is removed from the incoming queue to
  45  * an outgoing queue, and initialized as a 'response'. The worker thread then signals the
  46  * ircd thread (via a loopback socket) of the fact a result is available, by sending the
  47  * connection ID through the connection.
  48  *
  49  * The ircd thread then mutexes the queue once more, reads the outbound response off the head
  50  * of the queue, and sends it on its way to the original calling module.
  51  *
  52  * XXX: You might be asking "why doesnt he just send the response from within the worker thread?"
  53  * The answer to this is simple. The majority of InspIRCd, and in fact most ircd's are not
  54  * threadsafe. This module is designed to be threadsafe and is careful with its use of threads,
  55  * however, if we were to call a module's OnRequest even from within a thread which was not the
  56  * one the module was originally instantiated upon, there is a chance of all hell breaking loose
  57  * if a module is ever put in a re-enterant state (stack corruption could occur, crashes, data
  58  * corruption, and worse, so DONT think about it until the day comes when InspIRCd is 100%
  59  * gauranteed threadsafe!)
  60  *
  61  * For a diagram of this system please see http://www.inspircd.org/wiki/Mysql2
  62  */
  63
  64
  65 class SQLConnection;
  66 class Notifier;
  67
  68
  69 typedef std::map<std::string, SQLConnection*> ConnMap;
  70 bool giveup = false;
  71 static Module* SQLModule = NULL;
  72 static Notifier* MessagePipe = NULL;
  73 int QueueFD = -1;
  74
  75
  76 #if !defined(MYSQL_VERSION_ID) || MYSQL_VERSION_ID<32224
  77 #define mysql_field_count mysql_num_fields
  78 #endif
  79
  80 typedef std::deque<SQLresult*> ResultQueue;
  81
  82 /* A mutex to wrap around queue accesses */
  83 pthread_mutex_t queue_mutex = PTHREAD_MUTEX_INITIALIZER;
  84
  85 pthread_mutex_t results_mutex = PTHREAD_MUTEX_INITIALIZER;
  86
  87 pthread_mutex_t logging_mutex = PTHREAD_MUTEX_INITIALIZER;
  88
  89 /** Represents a mysql result set
  90  */
  91 class MySQLresult : public SQLresult
  92 {
  93         int currentrow;
  94         std::vector<std::string> colnames;
  95         std::vector<SQLfieldList> fieldlists;
  96         SQLfieldMap* fieldmap;
  97         SQLfieldMap fieldmap2;
  98         SQLfieldList emptyfieldlist;
  99         int rows;
 100  public:
 101
 102         MySQLresult(Module* self, Module* to, MYSQL_RES* res, int affected_rows, unsigned int id) : SQLresult(self, to, id), currentrow(0), fieldmap(NULL)
 103         {
 104                 /* A number of affected rows from from mysql_affected_rows.
 105                  */
 106                 fieldlists.clear();
 107                 rows = 0;
 108                 if (affected_rows >= 1)
 109                 {
 110                         rows = affected_rows;
 111                         fieldlists.resize(rows);
 112                 }
 113                 unsigned int field_count = 0;
 114                 if (res)
 115                 {
 116                         MYSQL_ROW row;
 117                         int n = 0;
 118                         while ((row = mysql_fetch_row(res)))
 119                         {
 120                                 if (fieldlists.size() < (unsigned int)rows+1)
 121                                 {
 122                                         fieldlists.resize(fieldlists.size()+1);
 123                                 }
 124                                 field_count = 0;
 125                                 MYSQL_FIELD *fields = mysql_fetch_fields(res);
 126                                 if(mysql_num_fields(res) == 0)
 127                                         break;
 128                                 if (fields && mysql_num_fields(res))
 129                                 {
 130                                         colnames.clear();
 131                                         while (field_count < mysql_num_fields(res))
 132                                         {
 133                                                 std::string a = (fields[field_count].name ? fields[field_count].name : "");
 134                                                 std::string b = (row[field_count] ? row[field_count] : "");
 135                                                 SQLfield sqlf(b, !row[field_count]);
 136                                                 colnames.push_back(a);
 137                                                 fieldlists[n].push_back(sqlf);
 138                                                 field_count++;
 139                                         }
 140                                         n++;
 141                                 }
 142                                 rows++;
 143                         }
 144                         mysql_free_result(res);
 145                 }
 146         }
 147
 148         MySQLresult(Module* self, Module* to, SQLerror e, unsigned int id) : SQLresult(self, to, id), currentrow(0)
 149         {
 150                 rows = 0;
 151                 error = e;
 152         }
 153
 154         ~MySQLresult()
 155         {
 156         }
 157
 158         virtual int Rows()
 159         {
 160                 return rows;
 161         }
 162
 163         virtual int Cols()
 164         {
 165                 return colnames.size();
 166         }
 167
 168         virtual std::string ColName(int column)
 169         {
 170                 if (column < (int)colnames.size())
 171                 {
 172                         return colnames[column];
 173                 }
 174                 else
 175                 {
 176                         throw SQLbadColName();
 177                 }
 178                 return "";
 179         }
 180
 181         virtual int ColNum(const std::string &column)
 182         {
 183                 for (unsigned int i = 0; i < colnames.size(); i++)
 184                 {
 185                         if (column == colnames[i])
 186                                 return i;
 187                 }
 188                 throw SQLbadColName();
 189                 return 0;
 190         }
 191
 192         virtual SQLfield GetValue(int row, int column)
 193         {
 194                 if ((row >= 0) && (row < rows) && (column >= 0) && (column < Cols()))
 195                 {
 196                         return fieldlists[row][column];
 197                 }
 198
 199                 throw SQLbadColName();
 200
 201                 /* XXX: We never actually get here because of the throw */
 202                 return SQLfield("",true);
 203         }
 204
 205         virtual SQLfieldList& GetRow()
 206         {
 207                 if (currentrow < rows)
 208                         return fieldlists[currentrow];
 209                 else
 210                         return emptyfieldlist;
 211         }
 212
 213         virtual SQLfieldMap& GetRowMap()
 214         {
 215                 fieldmap2.clear();
 216
 217                 if (currentrow < rows)
 218                 {
 219                         for (int i = 0; i < Cols(); i++)
 220                         {
 221                                 fieldmap2.insert(std::make_pair(colnames[i],GetValue(currentrow, i)));
 222                         }
 223                         currentrow++;
 224                 }
 225
 226                 return fieldmap2;
 227         }
 228
 229         virtual SQLfieldList* GetRowPtr()
 230         {
 231                 SQLfieldList* fieldlist = new SQLfieldList();
 232
 233                 if (currentrow < rows)
 234                 {
 235                         for (int i = 0; i < Rows(); i++)
 236                         {
 237                                 fieldlist->push_back(fieldlists[currentrow][i]);
 238                         }
 239                         currentrow++;
 240                 }
 241                 return fieldlist;
 242         }
 243
 244         virtual SQLfieldMap* GetRowMapPtr()
 245         {
 246                 fieldmap = new SQLfieldMap();
 247
 248                 if (currentrow < rows)
 249                 {
 250                         for (int i = 0; i < Cols(); i++)
 251                         {
 252                                 fieldmap->insert(std::make_pair(colnames[i],GetValue(currentrow, i)));
 253                         }
 254                         currentrow++;
 255                 }
 256
 257                 return fieldmap;
 258         }
 259
 260         virtual void Free(SQLfieldMap* fm)
 261         {
 262                 delete fm;
 263         }
 264
 265         virtual void Free(SQLfieldList* fl)
 266         {
 267                 delete fl;
 268         }
 269 };
 270
 271 class SQLConnection;
 272
 273 void NotifyMainThread(SQLConnection* connection_with_new_result);
 274
 275 /** Represents a connection to a mysql database
 276  */
 277 class SQLConnection : public classbase
 278 {
 279  protected:
 280
 281         MYSQL connection;
 282         MYSQL_RES *res;
 283         MYSQL_ROW row;
 284         SQLhost host;
 285         std::map<std::string,std::string> thisrow;
 286         bool Enabled;
 287
 288  public:
 289
 290         QueryQueue queue;
 291         ResultQueue rq;
 292
 293         // This constructor creates an SQLConnection object with the given credentials, but does not connect yet.
 294         SQLConnection(const SQLhost &hi) : host(hi), Enabled(false)
 295         {
 296         }
 297
 298         ~SQLConnection()
 299         {
 300                 Close();
 301         }
 302
 303         // This method connects to the database using the credentials supplied to the constructor, and returns
 304         // true upon success.
 305         bool Connect()
 306         {
 307                 unsigned int timeout = 1;
 308                 mysql_init(&connection);
 309                 mysql_options(&connection,MYSQL_OPT_CONNECT_TIMEOUT,(char*)&timeout);
 310                 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);
 311         }
 312
 313         void DoLeadingQuery()
 314         {
 315                 if (!CheckConnection())
 316                         return;
 317
 318                 /* Parse the command string and dispatch it to mysql */
 319                 SQLrequest& req = queue.front();
 320
 321                 /* Pointer to the buffer we screw around with substitution in */
 322                 char* query;
 323
 324                 /* Pointer to the current end of query, where we append new stuff */
 325                 char* queryend;
 326
 327                 /* Total length of the unescaped parameters */
 328                 unsigned long paramlen;
 329
 330                 /* Total length of query, used for binary-safety in mysql_real_query */
 331                 unsigned long querylength = 0;
 332
 333                 paramlen = 0;
 334
 335                 for(ParamL::iterator i = req.query.p.begin(); i != req.query.p.end(); i++)
 336                 {
 337                         paramlen += i->size();
 338                 }
 339
 340                 /* To avoid a lot of allocations, allocate enough memory for the biggest the escaped query could possibly be.
 341                  * sizeofquery + (totalparamlength*2) + 1
 342                  *
 343                  * The +1 is for null-terminating the string for mysql_real_escape_string
 344                  */
 345
 346                 query = new char[req.query.q.length() + (paramlen*2) + 1];
 347                 queryend = query;
 348
 349                 /* Okay, now we have a buffer large enough we need to start copying the query into it and escaping and substituting
 350                  * the parameters into it...
 351                  */
 352
 353                 for(unsigned long i = 0; i < req.query.q.length(); i++)
 354                 {
 355                         if(req.query.q[i] == '?')
 356                         {
 357                                 /* We found a place to substitute..what fun.
 358                                  * use mysql calls to escape and write the
 359                                  * escaped string onto the end of our query buffer,
 360                                  * then we "just" need to make sure queryend is
 361                                  * pointing at the right place.
 362                                  */
 363                                 if(req.query.p.size())
 364                                 {
 365                                         unsigned long len = mysql_real_escape_string(&connection, queryend, req.query.p.front().c_str(), req.query.p.front().length());
 366
 367                                         queryend += len;
 368                                         req.query.p.pop_front();
 369                                 }
 370                                 else
 371                                         break;
 372                         }
 373                         else
 374                         {
 375                                 *queryend = req.query.q[i];
 376                                 queryend++;
 377                         }
 378                         querylength++;
 379                 }
 380
 381                 *queryend = 0;
 382
 383                 pthread_mutex_lock(&queue_mutex);
 384                 req.query.q = query;
 385                 pthread_mutex_unlock(&queue_mutex);
 386
 387                 if (!mysql_real_query(&connection, req.query.q.data(), req.query.q.length()))
 388                 {
 389                         /* Successfull query */
 390                         res = mysql_use_result(&connection);
 391                         unsigned long rows = mysql_affected_rows(&connection);
 392                         MySQLresult* r = new MySQLresult(SQLModule, req.GetSource(), res, rows, req.id);
 393                         r->dbid = this->GetID();
 394                         r->query = req.query.q;
 395                         /* Put this new result onto the results queue.
 396                          * XXX: Remember to mutex the queue!
 397                          */
 398                         pthread_mutex_lock(&results_mutex);
 399                         rq.push_back(r);
 400                         pthread_mutex_unlock(&results_mutex);
 401                 }
 402                 else
 403                 {
 404                         /* XXX: See /usr/include/mysql/mysqld_error.h for a list of
 405                          * possible error numbers and error messages */
 406                         SQLerror e(QREPLY_FAIL, ConvToStr(mysql_errno(&connection)) + std::string(": ") + mysql_error(&connection));
 407                         MySQLresult* r = new MySQLresult(SQLModule, req.GetSource(), e, req.id);
 408                         r->dbid = this->GetID();
 409                         r->query = req.query.q;
 410
 411                         pthread_mutex_lock(&results_mutex);
 412                         rq.push_back(r);
 413                         pthread_mutex_unlock(&results_mutex);
 414                 }
 415
 416                 /* Now signal the main thread that we've got a result to process.
 417                  * Pass them this connection id as what to examine
 418                  */
 419
 420                 delete[] query;
 421
 422                 NotifyMainThread(this);
 423         }
 424
 425         bool ConnectionLost()
 426         {
 427                 if (&connection) {
 428                         return (mysql_ping(&connection) != 0);
 429                 }
 430                 else return false;
 431         }
 432
 433         bool CheckConnection()
 434         {
 435                 if (ConnectionLost()) {
 436                         return Connect();
 437                 }
 438                 else return true;
 439         }
 440
 441         std::string GetError()
 442         {
 443                 return mysql_error(&connection);
 444         }
 445
 446         const std::string& GetID()
 447         {
 448                 return host.id;
 449         }
 450
 451         std::string GetHost()
 452         {
 453                 return host.host;
 454         }
 455
 456         void SetEnable(bool Enable)
 457         {
 458                 Enabled = Enable;
 459         }
 460
 461         bool IsEnabled()
 462         {
 463                 return Enabled;
 464         }
 465
 466         void Close()
 467         {
 468                 mysql_close(&connection);
 469         }
 470
 471         const SQLhost& GetConfHost()
 472         {
 473                 return host;
 474         }
 475
 476 };
 477
 478 ConnMap Connections;
 479
 480 bool HasHost(const SQLhost &host)
 481 {
 482         for (ConnMap::iterator iter = Connections.begin(); iter != Connections.end(); iter++)
 483         {
 484                 if (host == iter->second->GetConfHost())
 485                         return true;
 486         }
 487         return false;
 488 }
 489
 490 bool HostInConf(ConfigReader* conf, const SQLhost &h)
 491 {
 492         for(int i = 0; i < conf->Enumerate("database"); i++)
 493         {
 494                 SQLhost host;
 495                 host.id         = conf->ReadValue("database", "id", i);
 496                 host.host       = conf->ReadValue("database", "hostname", i);
 497                 host.port       = conf->ReadInteger("database", "port", i, true);
 498                 host.name       = conf->ReadValue("database", "name", i);
 499                 host.user       = conf->ReadValue("database", "username", i);
 500                 host.pass       = conf->ReadValue("database", "password", i);
 501                 host.ssl        = conf->ReadFlag("database", "ssl", i);
 502                 if (h == host)
 503                         return true;
 504         }
 505         return false;
 506 }
 507
 508 void ClearOldConnections(ConfigReader* conf)
 509 {
 510         ConnMap::iterator i,safei;
 511         for (i = Connections.begin(); i != Connections.end(); i++)
 512         {
 513                 if (!HostInConf(conf, i->second->GetConfHost()))
 514                 {
 515                         delete i->second;
 516                         safei = i;
 517                         --i;
 518                         Connections.erase(safei);
 519                 }
 520         }
 521 }
 522
 523 void ClearAllConnections()
 524 {
 525         ConnMap::iterator i;
 526         while ((i = Connections.begin()) != Connections.end())
 527         {
 528                 Connections.erase(i);
 529                 delete i->second;
 530         }
 531 }
 532
 533 void ConnectDatabases(InspIRCd* ServerInstance)
 534 {
 535         for (ConnMap::iterator i = Connections.begin(); i != Connections.end(); i++)
 536         {
 537                 if (i->second->IsEnabled())
 538                         continue;
 539
 540                 i->second->SetEnable(true);
 541                 if (!i->second->Connect())
 542                 {
 543                         /* XXX: MUTEX */
 544                         pthread_mutex_lock(&logging_mutex);
 545                         ServerInstance->Log(DEFAULT,"SQL: Failed to connect database "+i->second->GetHost()+": Error: "+i->second->GetError());
 546                         i->second->SetEnable(false);
 547                         pthread_mutex_unlock(&logging_mutex);
 548                 }
 549         }
 550 }
 551
 552 void LoadDatabases(ConfigReader* conf, InspIRCd* ServerInstance)
 553 {
 554         ClearOldConnections(conf);
 555         for (int j =0; j < conf->Enumerate("database"); j++)
 556         {
 557                 SQLhost host;
 558                 host.id         = conf->ReadValue("database", "id", j);
 559                 host.host       = conf->ReadValue("database", "hostname", j);
 560                 host.port       = conf->ReadInteger("database", "port", j, true);
 561                 host.name       = conf->ReadValue("database", "name", j);
 562                 host.user       = conf->ReadValue("database", "username", j);
 563                 host.pass       = conf->ReadValue("database", "password", j);
 564                 host.ssl        = conf->ReadFlag("database", "ssl", j);
 565
 566                 if (HasHost(host))
 567                         continue;
 568
 569                 if (!host.id.empty() && !host.host.empty() && !host.name.empty() && !host.user.empty() && !host.pass.empty())
 570                 {
 571                         SQLConnection* ThisSQL = new SQLConnection(host);
 572                         Connections[host.id] = ThisSQL;
 573                 }
 574         }
 575         ConnectDatabases(ServerInstance);
 576 }
 577
 578 char FindCharId(const std::string &id)
 579 {
 580         char i = 1;
 581         for (ConnMap::iterator iter = Connections.begin(); iter != Connections.end(); ++iter, ++i)
 582         {
 583                 if (iter->first == id)
 584                 {
 585                         return i;
 586                 }
 587         }
 588         return 0;
 589 }
 590
 591 ConnMap::iterator GetCharId(char id)
 592 {
 593         char i = 1;
 594         for (ConnMap::iterator iter = Connections.begin(); iter != Connections.end(); ++iter, ++i)
 595         {
 596                 if (i == id)
 597                         return iter;
 598         }
 599         return Connections.end();
 600 }
 601
 602 void NotifyMainThread(SQLConnection* connection_with_new_result)
 603 {
 604         /* Here we write() to the socket the main thread has open
 605          * and we connect()ed back to before our thread became active.
 606          * The main thread is using a nonblocking socket tied into
 607          * the socket engine, so they wont block and they'll receive
 608          * nearly instant notification. Because we're in a seperate
 609          * thread, we can just use standard connect(), and we can
 610          * block if we like. We just send the connection id of the
 611          * connection back.
 612          *
 613          * NOTE: We only send a single char down the connection, this
 614          * way we know it wont get a partial read at the other end if
 615          * the system is especially congested (see bug #263).
 616          * The function FindCharId translates a connection name into a
 617          * one character id, and GetCharId translates a character id
 618          * back into an iterator.
 619          */
 620         char id = FindCharId(connection_with_new_result->GetID());
 621         send(QueueFD, &id, 1, 0);
 622 }
 623
 624 void* DispatcherThread(void* arg);
 625
 626 /** Used by m_mysql to notify one thread when the other has a result
 627  */
 628 class Notifier : public BufferedSocket
 629 {
 630         insp_sockaddr sock_us;
 631         socklen_t uslen;
 632
 633
 634  public:
 635
 636         /* Create a socket on a random port. Let the tcp stack allocate us an available port */
 637 #ifdef IPV6
 638         Notifier(InspIRCd* SI) : BufferedSocket(SI, "::1", 0, true, 3000)
 639 #else
 640         Notifier(InspIRCd* SI) : BufferedSocket(SI, "127.0.0.1", 0, true, 3000)
 641 #endif
 642         {
 643                 uslen = sizeof(sock_us);
 644                 if (getsockname(this->fd,(sockaddr*)&sock_us,&uslen))
 645                 {
 646                         throw ModuleException("Could not create random listening port on localhost");
 647                 }
 648         }
 649
 650         Notifier(InspIRCd* SI, int newfd, char* ip) : BufferedSocket(SI, newfd, ip)
 651         {
 652         }
 653
 654         /* Using getsockname and ntohs, we can determine which port number we were allocated */
 655         int GetPort()
 656         {
 657 #ifdef IPV6
 658                 return ntohs(sock_us.sin6_port);
 659 #else
 660                 return ntohs(sock_us.sin_port);
 661 #endif
 662         }
 663
 664         virtual int OnIncomingConnection(int newsock, char* ip)
 665         {
 666                 Notifier* n = new Notifier(this->Instance, newsock, ip);
 667                 n = n; /* Stop bitching at me, GCC */
 668                 return true;
 669         }
 670
 671         virtual bool OnDataReady()
 672         {
 673                 char data = 0;
 674                 /* NOTE: Only a single character is read so we know we
 675                  * cant get a partial read. (We've been told that theres
 676                  * data waiting, so we wont ever get EAGAIN)
 677                  * The function GetCharId translates a single character
 678                  * back into an iterator.
 679                  */
 680                 if (Instance->SE->Recv(this, &data, 1, 0) > 0)
 681                 {
 682                         ConnMap::iterator iter = GetCharId(data);
 683                         if (iter != Connections.end())
 684                         {
 685                                 /* Lock the mutex, send back the data */
 686                                 pthread_mutex_lock(&results_mutex);
 687                                 ResultQueue::iterator n = iter->second->rq.begin();
 688                                 (*n)->Send();
 689                                 iter->second->rq.pop_front();
 690                                 pthread_mutex_unlock(&results_mutex);
 691                                 return true;
 692                         }
 693                         /* No error, but unknown id */
 694                         return true;
 695                 }
 696
 697                 /* Erk, error on descriptor! */
 698                 return false;
 699         }
 700 };
 701
 702 /** MySQL module
 703  */
 704 class ModuleSQL : public Module
 705 {
 706  public:
 707
 708         ConfigReader *Conf;
 709         InspIRCd* PublicServerInstance;
 710         pthread_t Dispatcher;
 711         int currid;
 712         bool rehashing;
 713
 714         ModuleSQL(InspIRCd* Me)
 715         : Module::Module(Me), rehashing(false)
 716         {
 717                 ServerInstance->Modules->UseInterface("SQLutils");
 718
 719                 Conf = new ConfigReader(ServerInstance);
 720                 PublicServerInstance = ServerInstance;
 721                 currid = 0;
 722                 SQLModule = this;
 723
 724                 MessagePipe = new Notifier(ServerInstance);
 725
 726                 pthread_attr_t attribs;
 727                 pthread_attr_init(&attribs);
 728                 pthread_attr_setdetachstate(&attribs, PTHREAD_CREATE_DETACHED);
 729                 if (pthread_create(&this->Dispatcher, &attribs, DispatcherThread, (void *)this) != 0)
 730                 {
 731                         throw ModuleException("m_mysql: Failed to create dispatcher thread: " + std::string(strerror(errno)));
 732                 }
 733
 734                 if (!ServerInstance->Modules->PublishFeature("SQL", this))
 735                 {
 736                         /* Tell worker thread to exit NOW */
 737                         giveup = true;
 738                         throw ModuleException("m_mysql: Unable to publish feature 'SQL'");
 739                 }
 740
 741                 ServerInstance->Modules->PublishInterface("SQL", this);
 742                 Implementation eventlist[] = { I_OnRehash, I_OnRequest };
 743                 ServerInstance->Modules->Attach(eventlist, this, 2);
 744         }
 745
 746         virtual ~ModuleSQL()
 747         {
 748                 giveup = true;
 749                 ClearAllConnections();
 750                 delete Conf;
 751                 ServerInstance->Modules->UnpublishInterface("SQL", this);
 752                 ServerInstance->Modules->UnpublishFeature("SQL");
 753                 ServerInstance->Modules->DoneWithInterface("SQLutils");
 754         }
 755
 756
 757
 758         unsigned long NewID()
 759         {
 760                 if (currid+1 == 0)
 761                         currid++;
 762                 return ++currid;
 763         }
 764
 765         char* OnRequest(Request* request)
 766         {
 767                 if(strcmp(SQLREQID, request->GetId()) == 0)
 768                 {
 769                         SQLrequest* req = (SQLrequest*)request;
 770
 771                         /* XXX: Lock */
 772                         pthread_mutex_lock(&queue_mutex);
 773
 774                         ConnMap::iterator iter;
 775
 776                         char* returnval = NULL;
 777
 778                         if((iter = Connections.find(req->dbid)) != Connections.end())
 779                         {
 780                                 req->id = NewID();
 781                                 iter->second->queue.push(*req);
 782                                 returnval = SQLSUCCESS;
 783                         }
 784                         else
 785                         {
 786                                 req->error.Id(BAD_DBID);
 787                         }
 788
 789                         pthread_mutex_unlock(&queue_mutex);
 790                         /* XXX: Unlock */
 791
 792                         return returnval;
 793                 }
 794
 795                 return NULL;
 796         }
 797
 798         virtual void OnRehash(User* user, const std::string &parameter)
 799         {
 800                 rehashing = true;
 801         }
 802
 803         virtual Version GetVersion()
 804         {
 805                 return Version(1,1,0,0,VF_VENDOR|VF_SERVICEPROVIDER,API_VERSION);
 806         }
 807
 808 };
 809
 810 void* DispatcherThread(void* arg)
 811 {
 812         ModuleSQL* thismodule = (ModuleSQL*)arg;
 813         LoadDatabases(thismodule->Conf, thismodule->PublicServerInstance);
 814
 815         /* Connect back to the Notifier */
 816
 817         if ((QueueFD = socket(AF_FAMILY, SOCK_STREAM, 0)) == -1)
 818         {
 819                 /* crap, we're out of sockets... */
 820                 return NULL;
 821         }
 822
 823         insp_sockaddr addr;
 824
 825 #ifdef IPV6
 826         insp_aton("::1", &addr.sin6_addr);
 827         addr.sin6_family = AF_FAMILY;
 828         addr.sin6_port = htons(MessagePipe->GetPort());
 829 #else
 830         insp_inaddr ia;
 831         insp_aton("127.0.0.1", &ia);
 832         addr.sin_family = AF_FAMILY;
 833         addr.sin_addr = ia;
 834         addr.sin_port = htons(MessagePipe->GetPort());
 835 #endif
 836
 837         if (connect(QueueFD, (sockaddr*)&addr,sizeof(addr)) == -1)
 838         {
 839                 /* wtf, we cant connect to it, but we just created it! */
 840                 return NULL;
 841         }
 842
 843         while (!giveup)
 844         {
 845                 if (thismodule->rehashing)
 846                 {
 847                 /* XXX: Lock */
 848                         pthread_mutex_lock(&queue_mutex);
 849                         thismodule->rehashing = false;
 850                         LoadDatabases(thismodule->Conf, thismodule->PublicServerInstance);
 851                         pthread_mutex_unlock(&queue_mutex);
 852                         /* XXX: Unlock */
 853                 }
 854
 855                 SQLConnection* conn = NULL;
 856                 /* XXX: Lock here for safety */
 857                 pthread_mutex_lock(&queue_mutex);
 858                 for (ConnMap::iterator i = Connections.begin(); i != Connections.end(); i++)
 859                 {
 860                         if (i->second->queue.totalsize())
 861                         {
 862                                 conn = i->second;
 863                                 break;
 864                         }
 865                 }
 866                 pthread_mutex_unlock(&queue_mutex);
 867                 /* XXX: Unlock */
 868
 869                 /* Theres an item! */
 870                 if (conn)
 871                 {
 872                         conn->DoLeadingQuery();
 873
 874                         /* XXX: Lock */
 875                         pthread_mutex_lock(&queue_mutex);
 876                         conn->queue.pop();
 877                         pthread_mutex_unlock(&queue_mutex);
 878                         /* XXX: Unlock */
 879                 }
 880
 881                 usleep(50);
 882         }
 883
 884         return NULL;
 885 }
 886
 887 MODULE_INIT(ModuleSQL)