src/modules/extra/m_mysql.cpp

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