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