src/modules/extra/m_mysql.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/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 "m_sqlv2.h"
  20
  21 #ifdef WINDOWS
  22 #pragma comment(lib, "mysqlclient.lib")
  23 #endif
  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 class Thread, 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://wiki.inspircd.org/Mysql2
  64  */
  65
  66
  67 class SQLConnection;
  68 class DispatcherThread;
  69
  70 typedef std::map<std::string, SQLConnection*> ConnMap;
  71 typedef std::deque<SQLresult*> ResultQueue;
  72
  73 static unsigned long count(const char * const str, char a)
  74 {
  75         unsigned long n = 0;
  76         for (const char *p = str; *p; ++p)
  77         {
  78                 if (*p == '?')
  79                         ++n;
  80         }
  81         return n;
  82 }
  83
  84
  85 /** MySQL module
  86  *  */
  87 class ModuleSQL : public Module
  88 {
  89  public:
  90          int currid;
  91          bool rehashing;
  92          DispatcherThread* Dispatcher;
  93          Mutex ResultsMutex;
  94          Mutex LoggingMutex;
  95          Mutex ConnMutex;
  96
  97          ModuleSQL();
  98          ~ModuleSQL();
  99          unsigned long NewID();
 100          void OnRequest(Request& request);
 101          void OnRehash(User* user);
 102          Version GetVersion();
 103 };
 104
 105
 106 #if !defined(MYSQL_VERSION_ID) || MYSQL_VERSION_ID<32224
 107 #define mysql_field_count mysql_num_fields
 108 #endif
 109
 110 /** Represents a mysql result set
 111  */
 112 class MySQLresult : public SQLresult
 113 {
 114         int currentrow;
 115         std::vector<std::string> colnames;
 116         std::vector<SQLfieldList> fieldlists;
 117         SQLfieldMap* fieldmap;
 118         SQLfieldMap fieldmap2;
 119         SQLfieldList emptyfieldlist;
 120         int rows;
 121  public:
 122
 123         MySQLresult(Module* self, Module* to, MYSQL_RES* res, int affected_rows, unsigned int rid) : SQLresult(self, to, rid), currentrow(0), fieldmap(NULL)
 124         {
 125                 /* A number of affected rows from from mysql_affected_rows.
 126                  */
 127                 fieldlists.clear();
 128                 rows = 0;
 129                 if (affected_rows >= 1)
 130                 {
 131                         rows = affected_rows;
 132                         fieldlists.resize(rows);
 133                 }
 134                 unsigned int field_count = 0;
 135                 if (res)
 136                 {
 137                         MYSQL_ROW row;
 138                         int n = 0;
 139                         while ((row = mysql_fetch_row(res)))
 140                         {
 141                                 if (fieldlists.size() < (unsigned int)rows+1)
 142                                 {
 143                                         fieldlists.resize(fieldlists.size()+1);
 144                                 }
 145                                 field_count = 0;
 146                                 MYSQL_FIELD *fields = mysql_fetch_fields(res);
 147                                 if(mysql_num_fields(res) == 0)
 148                                         break;
 149                                 if (fields && mysql_num_fields(res))
 150                                 {
 151                                         colnames.clear();
 152                                         while (field_count < mysql_num_fields(res))
 153                                         {
 154                                                 std::string a = (fields[field_count].name ? fields[field_count].name : "");
 155                                                 std::string b = (row[field_count] ? row[field_count] : "");
 156                                                 SQLfield sqlf(b, !row[field_count]);
 157                                                 colnames.push_back(a);
 158                                                 fieldlists[n].push_back(sqlf);
 159                                                 field_count++;
 160                                         }
 161                                         n++;
 162                                 }
 163                                 rows++;
 164                         }
 165                         mysql_free_result(res);
 166                         res = NULL;
 167                 }
 168         }
 169
 170         MySQLresult(Module* self, Module* to, SQLerror e, unsigned int rid) : SQLresult(self, to, rid), currentrow(0)
 171         {
 172                 rows = 0;
 173                 error = e;
 174         }
 175
 176         ~MySQLresult()
 177         {
 178         }
 179
 180         virtual int Rows()
 181         {
 182                 return rows;
 183         }
 184
 185         virtual int Cols()
 186         {
 187                 return colnames.size();
 188         }
 189
 190         virtual std::string ColName(int column)
 191         {
 192                 if (column < (int)colnames.size())
 193                 {
 194                         return colnames[column];
 195                 }
 196                 else
 197                 {
 198                         throw SQLbadColName();
 199                 }
 200                 return "";
 201         }
 202
 203         virtual int ColNum(const std::string &column)
 204         {
 205                 for (unsigned int i = 0; i < colnames.size(); i++)
 206                 {
 207                         if (column == colnames[i])
 208                                 return i;
 209                 }
 210                 throw SQLbadColName();
 211                 return 0;
 212         }
 213
 214         virtual SQLfield GetValue(int row, int column)
 215         {
 216                 if ((row >= 0) && (row < rows) && (column >= 0) && (column < Cols()))
 217                 {
 218                         return fieldlists[row][column];
 219                 }
 220
 221                 throw SQLbadColName();
 222
 223                 /* XXX: We never actually get here because of the throw */
 224                 return SQLfield("",true);
 225         }
 226
 227         virtual SQLfieldList& GetRow()
 228         {
 229                 if (currentrow < rows)
 230                         return fieldlists[currentrow++];
 231                 else
 232                         return emptyfieldlist;
 233         }
 234
 235         virtual SQLfieldMap& GetRowMap()
 236         {
 237                 fieldmap2.clear();
 238
 239                 if (currentrow < rows)
 240                 {
 241                         for (int i = 0; i < Cols(); i++)
 242                         {
 243                                 fieldmap2.insert(std::make_pair(colnames[i],GetValue(currentrow, i)));
 244                         }
 245                         currentrow++;
 246                 }
 247
 248                 return fieldmap2;
 249         }
 250
 251         virtual SQLfieldList* GetRowPtr()
 252         {
 253                 SQLfieldList* fieldlist = new SQLfieldList();
 254
 255                 if (currentrow < rows)
 256                 {
 257                         for (int i = 0; i < Rows(); i++)
 258                         {
 259                                 fieldlist->push_back(fieldlists[currentrow][i]);
 260                         }
 261                         currentrow++;
 262                 }
 263                 return fieldlist;
 264         }
 265
 266         virtual SQLfieldMap* GetRowMapPtr()
 267         {
 268                 fieldmap = new SQLfieldMap();
 269
 270                 if (currentrow < rows)
 271                 {
 272                         for (int i = 0; i < Cols(); i++)
 273                         {
 274                                 fieldmap->insert(std::make_pair(colnames[i],GetValue(currentrow, i)));
 275                         }
 276                         currentrow++;
 277                 }
 278
 279                 return fieldmap;
 280         }
 281
 282         virtual void Free(SQLfieldMap* fm)
 283         {
 284                 delete fm;
 285         }
 286
 287         virtual void Free(SQLfieldList* fl)
 288         {
 289                 delete fl;
 290         }
 291 };
 292
 293 /** Represents a connection to a mysql database
 294  */
 295 class SQLConnection : public classbase
 296 {
 297  protected:
 298         MYSQL *connection;
 299         MYSQL_RES *res;
 300         MYSQL_ROW *row;
 301         SQLhost host;
 302         std::map<std::string,std::string> thisrow;
 303         bool Enabled;
 304         ModuleSQL* Parent;
 305         std::string initquery;
 306
 307  public:
 308
 309         QueryQueue queue;
 310         ResultQueue rq;
 311
 312         // This constructor creates an SQLConnection object with the given credentials, but does not connect yet.
 313         SQLConnection(const SQLhost &hi, ModuleSQL* Creator) : connection(NULL), host(hi), Enabled(false), Parent(Creator)
 314         {
 315         }
 316
 317         ~SQLConnection()
 318         {
 319                 Close();
 320         }
 321
 322         // This method connects to the database using the credentials supplied to the constructor, and returns
 323         // true upon success.
 324         bool Connect()
 325         {
 326                 unsigned int timeout = 1;
 327                 connection = mysql_init(connection);
 328                 mysql_options(connection,MYSQL_OPT_CONNECT_TIMEOUT,(char*)&timeout);
 329                 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);
 330         }
 331
 332         void DoLeadingQuery()
 333         {
 334                 if (!CheckConnection())
 335                         return;
 336
 337                 if( !initquery.empty() )
 338                         mysql_query(connection,initquery.c_str());
 339
 340                 /* Parse the command string and dispatch it to mysql */
 341                 SQLrequest* req = queue.front();
 342
 343                 /* Pointer to the buffer we screw around with substitution in */
 344                 char* query;
 345
 346                 /* Pointer to the current end of query, where we append new stuff */
 347                 char* queryend;
 348
 349                 /* Total length of the unescaped parameters */
 350                 unsigned long maxparamlen, paramcount;
 351
 352                 /* The length of the longest parameter */
 353                 maxparamlen = 0;
 354
 355                 for(ParamL::iterator i = req->query.p.begin(); i != req->query.p.end(); i++)
 356                 {
 357                         if (i->size() > maxparamlen)
 358                                 maxparamlen = i->size();
 359                 }
 360
 361                 /* How many params are there in the query? */
 362                 paramcount = count(req->query.q.c_str(), '?');
 363
 364                 /* This stores copy of params to be inserted with using numbered params 1;3B*/
 365                 ParamL paramscopy(req->query.p);
 366
 367                 /* To avoid a lot of allocations, allocate enough memory for the biggest the escaped query could possibly be.
 368                  * sizeofquery + (maxtotalparamlength*2) + 1
 369                  *
 370                  * The +1 is for null-terminating the string for mysql_real_escape_string
 371                  */
 372
 373                 query = new char[req->query.q.length() + (maxparamlen*paramcount*2) + 1];
 374                 queryend = query;
 375
 376                 /* Okay, now we have a buffer large enough we need to start copying the query into it and escaping and substituting
 377                  * the parameters into it...
 378                  */
 379
 380                 for(unsigned long i = 0; i < req->query.q.length(); i++)
 381                 {
 382                         if(req->query.q[i] == '?')
 383                         {
 384                                 /* We found a place to substitute..what fun.
 385                                  * use mysql calls to escape and write the
 386                                  * escaped string onto the end of our query buffer,
 387                                  * then we "just" need to make sure queryend is
 388                                  * pointing at the right place.
 389                                  */
 390
 391                                 /* Is it numbered parameter?
 392                                  */
 393
 394                                 bool numbered;
 395                                 numbered = false;
 396
 397                                 /* Numbered parameter number :|
 398                                  */
 399                                 unsigned int paramnum;
 400                                 paramnum = 0;
 401
 402                                 /* Let's check if it's a numbered param. And also calculate it's number.
 403                                  */
 404
 405                                 while ((i < req->query.q.length() - 1) && (req->query.q[i+1] >= '0') && (req->query.q[i+1] <= '9'))
 406                                 {
 407                                         numbered = true;
 408                                         ++i;
 409                                         paramnum = paramnum * 10 + req->query.q[i] - '0';
 410                                 }
 411
 412                                 if (paramnum > paramscopy.size() - 1)
 413                                 {
 414                                         /* index is out of range!
 415                                          */
 416                                         numbered = false;
 417                                 }
 418
 419                                 if (numbered)
 420                                 {
 421                                         unsigned long len = mysql_real_escape_string(connection, queryend, paramscopy[paramnum].c_str(), paramscopy[paramnum].length());
 422
 423                                         queryend += len;
 424                                 }
 425                                 else if (req->query.p.size())
 426                                 {
 427                                         unsigned long len = mysql_real_escape_string(connection, queryend, req->query.p.front().c_str(), req->query.p.front().length());
 428
 429                                         queryend += len;
 430                                         req->query.p.pop_front();
 431                                 }
 432                                 else
 433                                         break;
 434                         }
 435                         else
 436                         {
 437                                 *queryend = req->query.q[i];
 438                                 queryend++;
 439                         }
 440                 }
 441
 442                 *queryend = 0;
 443
 444                 req->query.q = query;
 445
 446                 if (!mysql_real_query(connection, req->query.q.data(), req->query.q.length()))
 447                 {
 448                         /* Successfull query */
 449                         res = mysql_use_result(connection);
 450                         unsigned long rows = mysql_affected_rows(connection);
 451                         MySQLresult* r = new MySQLresult(Parent, req->source, res, rows, req->id);
 452                         r->dbid = this->GetID();
 453                         r->query = req->query.q;
 454                         /* Put this new result onto the results queue.
 455                          * XXX: Remember to mutex the queue!
 456                          */
 457                         Parent->ResultsMutex.Lock();
 458                         rq.push_back(r);
 459                         Parent->ResultsMutex.Unlock();
 460                 }
 461                 else
 462                 {
 463                         /* XXX: See /usr/include/mysql/mysqld_error.h for a list of
 464                          * possible error numbers and error messages */
 465                         SQLerror e(SQL_QREPLY_FAIL, ConvToStr(mysql_errno(connection)) + std::string(": ") + mysql_error(connection));
 466                         MySQLresult* r = new MySQLresult(Parent, req->source, e, req->id);
 467                         r->dbid = this->GetID();
 468                         r->query = req->query.q;
 469
 470                         Parent->ResultsMutex.Lock();
 471                         rq.push_back(r);
 472                         Parent->ResultsMutex.Unlock();
 473                 }
 474
 475                 delete[] query;
 476         }
 477
 478         bool ConnectionLost()
 479         {
 480                 if (&connection)
 481                 {
 482                         return (mysql_ping(connection) != 0);
 483                 }
 484                 else return false;
 485         }
 486
 487         bool CheckConnection()
 488         {
 489                 if (ConnectionLost())
 490                 {
 491                         return Connect();
 492                 }
 493                 else return true;
 494         }
 495
 496         std::string GetError()
 497         {
 498                 return mysql_error(connection);
 499         }
 500
 501         const std::string& GetID()
 502         {
 503                 return host.id;
 504         }
 505
 506         std::string GetHost()
 507         {
 508                 return host.host;
 509         }
 510
 511         void setInitialQuery(std::string init)
 512         {
 513                 initquery = init;
 514         }
 515
 516         void SetEnable(bool Enable)
 517         {
 518                 Enabled = Enable;
 519         }
 520
 521         bool IsEnabled()
 522         {
 523                 return Enabled;
 524         }
 525
 526         void Close()
 527         {
 528                 mysql_close(connection);
 529         }
 530
 531         const SQLhost& GetConfHost()
 532         {
 533                 return host;
 534         }
 535
 536 };
 537
 538 ConnMap Connections;
 539
 540 bool HasHost(const SQLhost &host)
 541 {
 542         for (ConnMap::iterator iter = Connections.begin(); iter != Connections.end(); iter++)
 543         {
 544                 if (host == iter->second->GetConfHost())
 545                         return true;
 546         }
 547         return false;
 548 }
 549
 550 bool HostInConf(const SQLhost &h)
 551 {
 552         ConfigReader conf;
 553         for(int i = 0; i < conf.Enumerate("database"); i++)
 554         {
 555                 SQLhost host;
 556                 host.id         = conf.ReadValue("database", "id", i);
 557                 host.host       = conf.ReadValue("database", "hostname", i);
 558                 host.port       = conf.ReadInteger("database", "port", i, true);
 559                 host.name       = conf.ReadValue("database", "name", i);
 560                 host.user       = conf.ReadValue("database", "username", i);
 561                 host.pass       = conf.ReadValue("database", "password", i);
 562                 host.ssl        = conf.ReadFlag("database", "ssl", i);
 563                 if (h == host)
 564                         return true;
 565         }
 566         return false;
 567 }
 568
 569 void ClearOldConnections()
 570 {
 571         ConnMap::iterator i,safei;
 572         for (i = Connections.begin(); i != Connections.end(); i++)
 573         {
 574                 if (!HostInConf(i->second->GetConfHost()))
 575                 {
 576                         delete i->second;
 577                         safei = i;
 578                         --i;
 579                         Connections.erase(safei);
 580                 }
 581         }
 582 }
 583
 584 void ClearAllConnections()
 585 {
 586         ConnMap::iterator i;
 587         while ((i = Connections.begin()) != Connections.end())
 588         {
 589                 Connections.erase(i);
 590                 delete i->second;
 591         }
 592 }
 593
 594 void ConnectDatabases(ModuleSQL* Parent)
 595 {
 596         for (ConnMap::iterator i = Connections.begin(); i != Connections.end(); i++)
 597         {
 598                 if (i->second->IsEnabled())
 599                         continue;
 600
 601                 i->second->SetEnable(true);
 602                 if (!i->second->Connect())
 603                 {
 604                         /* XXX: MUTEX */
 605                         Parent->LoggingMutex.Lock();
 606                         ServerInstance->Logs->Log("m_mysql",DEFAULT,"SQL: Failed to connect database "+i->second->GetHost()+": Error: "+i->second->GetError());
 607                         i->second->SetEnable(false);
 608                         Parent->LoggingMutex.Unlock();
 609                 }
 610         }
 611 }
 612
 613 void LoadDatabases(ModuleSQL* Parent)
 614 {
 615         ConfigReader conf;
 616         Parent->ConnMutex.Lock();
 617         ClearOldConnections();
 618         for (int j =0; j < conf.Enumerate("database"); j++)
 619         {
 620                 SQLhost host;
 621                 host.id         = conf.ReadValue("database", "id", j);
 622                 host.host       = conf.ReadValue("database", "hostname", j);
 623                 host.port       = conf.ReadInteger("database", "port", j, true);
 624                 host.name       = conf.ReadValue("database", "name", j);
 625                 host.user       = conf.ReadValue("database", "username", j);
 626                 host.pass       = conf.ReadValue("database", "password", j);
 627                 host.ssl        = conf.ReadFlag("database", "ssl", j);
 628                 std::string initquery = conf.ReadValue("database", "initialquery", j);
 629
 630                 if (HasHost(host))
 631                         continue;
 632
 633                 if (!host.id.empty() && !host.host.empty() && !host.name.empty() && !host.user.empty() && !host.pass.empty())
 634                 {
 635                         SQLConnection* ThisSQL = new SQLConnection(host, Parent);
 636                         Connections[host.id] = ThisSQL;
 637
 638                         ThisSQL->setInitialQuery(initquery);
 639                 }
 640         }
 641         ConnectDatabases(Parent);
 642         Parent->ConnMutex.Unlock();
 643 }
 644
 645 char FindCharId(const std::string &id)
 646 {
 647         char i = 1;
 648         for (ConnMap::iterator iter = Connections.begin(); iter != Connections.end(); ++iter, ++i)
 649         {
 650                 if (iter->first == id)
 651                 {
 652                         return i;
 653                 }
 654         }
 655         return 0;
 656 }
 657
 658 ConnMap::iterator GetCharId(char id)
 659 {
 660         char i = 1;
 661         for (ConnMap::iterator iter = Connections.begin(); iter != Connections.end(); ++iter, ++i)
 662         {
 663                 if (i == id)
 664                         return iter;
 665         }
 666         return Connections.end();
 667 }
 668
 669 class ModuleSQL;
 670
 671 class DispatcherThread : public SocketThread
 672 {
 673  private:
 674         ModuleSQL* const Parent;
 675  public:
 676         DispatcherThread(ModuleSQL* CreatorModule) : Parent(CreatorModule) { }
 677         ~DispatcherThread() { }
 678         virtual void Run();
 679         virtual void OnNotify();
 680 };
 681
 682 ModuleSQL::ModuleSQL() : rehashing(false)
 683 {
 684         ServerInstance->Modules->UseInterface("SQLutils");
 685
 686         currid = 0;
 687
 688         Dispatcher = new DispatcherThread(this);
 689         ServerInstance->Threads->Start(Dispatcher);
 690
 691         if (!ServerInstance->Modules->PublishFeature("SQL", this))
 692         {
 693                 Dispatcher->join();
 694                 delete Dispatcher;
 695                 ServerInstance->Modules->DoneWithInterface("SQLutils");
 696                 throw ModuleException("m_mysql: Unable to publish feature 'SQL'");
 697         }
 698
 699         ServerInstance->Modules->PublishInterface("SQL", this);
 700         Implementation eventlist[] = { I_OnRehash };
 701         ServerInstance->Modules->Attach(eventlist, this, 1);
 702 }
 703
 704 ModuleSQL::~ModuleSQL()
 705 {
 706         delete Dispatcher;
 707         ClearAllConnections();
 708         ServerInstance->Modules->UnpublishInterface("SQL", this);
 709         ServerInstance->Modules->UnpublishFeature("SQL");
 710         ServerInstance->Modules->DoneWithInterface("SQLutils");
 711 }
 712
 713 unsigned long ModuleSQL::NewID()
 714 {
 715         if (currid+1 == 0)
 716                 currid++;
 717         return ++currid;
 718 }
 719
 720 void ModuleSQL::OnRequest(Request& request)
 721 {
 722         if(strcmp(SQLREQID, request.id) == 0)
 723         {
 724                 SQLrequest* req = (SQLrequest*)&request;
 725
 726                 ConnMap::iterator iter;
 727
 728                 Dispatcher->LockQueue();
 729                 ConnMutex.Lock();
 730                 if((iter = Connections.find(req->dbid)) != Connections.end())
 731                 {
 732                         req->id = NewID();
 733                         iter->second->queue.push(new SQLrequest(*req));
 734                 }
 735                 else
 736                 {
 737                         req->error.Id(SQL_BAD_DBID);
 738                 }
 739
 740                 ConnMutex.Unlock();
 741                 Dispatcher->UnlockQueueWakeup();
 742                 /* Yes, it's possible this will generate a spurious wakeup.
 743                  * That's fine, it'll just get ignored.
 744                  */
 745         }
 746 }
 747
 748 void ModuleSQL::OnRehash(User* user)
 749 {
 750         Dispatcher->LockQueue();
 751         rehashing = true;
 752         Dispatcher->UnlockQueueWakeup();
 753 }
 754
 755 Version ModuleSQL::GetVersion()
 756 {
 757         return Version("SQL Service Provider module for all other m_sql* modules", VF_VENDOR);
 758 }
 759
 760 void DispatcherThread::Run()
 761 {
 762         LoadDatabases(Parent);
 763
 764         SQLConnection* conn = NULL;
 765
 766         this->LockQueue();
 767         while (!this->GetExitFlag())
 768         {
 769                 if (Parent->rehashing)
 770                 {
 771                         Parent->rehashing = false;
 772                         LoadDatabases(Parent);
 773                 }
 774
 775                 conn = NULL;
 776                 Parent->ConnMutex.Lock();
 777                 for (ConnMap::iterator i = Connections.begin(); i != Connections.end(); i++)
 778                 {
 779                         if (i->second->queue.totalsize())
 780                         {
 781                                 conn = i->second;
 782                                 break;
 783                         }
 784                 }
 785                 Parent->ConnMutex.Unlock();
 786
 787                 if (conn)
 788                 {
 789                         /* There's an item! */
 790                         this->UnlockQueue();
 791                         conn->DoLeadingQuery();
 792                         this->NotifyParent();
 793                         this->LockQueue();
 794                         conn->queue.pop();
 795                 }
 796                 else
 797                 {
 798                         /* We know the queue is empty, we can safely hang this thread until
 799                          * something happens
 800                          */
 801                         this->WaitForQueue();
 802                 }
 803         }
 804         this->UnlockQueue();
 805 }
 806
 807 void DispatcherThread::OnNotify()
 808 {
 809         SQLConnection* conn;
 810         while (1)
 811         {
 812                 conn = NULL;
 813                 Parent->ConnMutex.Lock();
 814                 for (ConnMap::iterator iter = Connections.begin(); iter != Connections.end(); iter++)
 815                 {
 816                         if (!iter->second->rq.empty())
 817                         {
 818                                 conn = iter->second;
 819                                 break;
 820                         }
 821                 }
 822                 Parent->ConnMutex.Unlock();
 823
 824                 if (!conn)
 825                         break;
 826
 827                 Parent->ResultsMutex.Lock();
 828                 ResultQueue::iterator n = conn->rq.begin();
 829                 Parent->ResultsMutex.Unlock();
 830
 831                 (*n)->Send();
 832                 delete (*n);
 833
 834                 Parent->ResultsMutex.Lock();
 835                 conn->rq.pop_front();
 836                 Parent->ResultsMutex.Unlock();
 837         }
 838 }
 839
 840 MODULE_INIT(ModuleSQL)