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://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 "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://www.inspircd.org/wiki/Mysql2
  64  */
  65
  66
  67 class SQLConnection;
  68 class MySQLListener;
  69
  70
  71 typedef std::map<std::string, SQLConnection*> ConnMap;
  72 static MySQLListener *MessagePipe = NULL;
  73 int QueueFD = -1;
  74
  75 class DispatcherThread;
  76
  77 unsigned long count(const char * const str, char a)
  78 {
  79         unsigned long n = 0;
  80         for (const char *p = reinterpret_cast<const char *>(str); *p; ++p)
  81         {
  82                 if (*p == '?')
  83                         ++n;
  84         }
  85         return n;
  86 }
  87
  88
  89 /** MySQL module
  90  *  */
  91 class ModuleSQL : public Module
  92 {
  93  public:
  94
  95          ConfigReader *Conf;
  96          InspIRCd* PublicServerInstance;
  97          int currid;
  98          bool rehashing;
  99          DispatcherThread* Dispatcher;
 100          Mutex* QueueMutex;
 101          Mutex* ResultsMutex;
 102          Mutex* LoggingMutex;
 103          Mutex* ConnMutex;
 104
 105          ModuleSQL(InspIRCd* Me);
 106          ~ModuleSQL();
 107          unsigned long NewID();
 108          const char* OnRequest(Request* request);
 109          void OnRehash(User* user, const std::string &parameter);
 110          Version GetVersion();
 111 };
 112
 113
 114
 115 #if !defined(MYSQL_VERSION_ID) || MYSQL_VERSION_ID<32224
 116 #define mysql_field_count mysql_num_fields
 117 #endif
 118
 119 typedef std::deque<SQLresult*> ResultQueue;
 120
 121 /** Represents a mysql result set
 122  */
 123 class MySQLresult : public SQLresult
 124 {
 125         int currentrow;
 126         std::vector<std::string> colnames;
 127         std::vector<SQLfieldList> fieldlists;
 128         SQLfieldMap* fieldmap;
 129         SQLfieldMap fieldmap2;
 130         SQLfieldList emptyfieldlist;
 131         int rows;
 132  public:
 133
 134         MySQLresult(Module* self, Module* to, MYSQL_RES* res, int affected_rows, unsigned int rid) : SQLresult(self, to, rid), currentrow(0), fieldmap(NULL)
 135         {
 136                 /* A number of affected rows from from mysql_affected_rows.
 137                  */
 138                 fieldlists.clear();
 139                 rows = 0;
 140                 if (affected_rows >= 1)
 141                 {
 142                         rows = affected_rows;
 143                         fieldlists.resize(rows);
 144                 }
 145                 unsigned int field_count = 0;
 146                 if (res)
 147                 {
 148                         MYSQL_ROW row;
 149                         int n = 0;
 150                         while ((row = mysql_fetch_row(res)))
 151                         {
 152                                 if (fieldlists.size() < (unsigned int)rows+1)
 153                                 {
 154                                         fieldlists.resize(fieldlists.size()+1);
 155                                 }
 156                                 field_count = 0;
 157                                 MYSQL_FIELD *fields = mysql_fetch_fields(res);
 158                                 if(mysql_num_fields(res) == 0)
 159                                         break;
 160                                 if (fields && mysql_num_fields(res))
 161                                 {
 162                                         colnames.clear();
 163                                         while (field_count < mysql_num_fields(res))
 164                                         {
 165                                                 std::string a = (fields[field_count].name ? fields[field_count].name : "");
 166                                                 std::string b = (row[field_count] ? row[field_count] : "");
 167                                                 SQLfield sqlf(b, !row[field_count]);
 168                                                 colnames.push_back(a);
 169                                                 fieldlists[n].push_back(sqlf);
 170                                                 field_count++;
 171                                         }
 172                                         n++;
 173                                 }
 174                                 rows++;
 175                         }
 176                         mysql_free_result(res);
 177                 }
 178         }
 179
 180         MySQLresult(Module* self, Module* to, SQLerror e, unsigned int rid) : SQLresult(self, to, rid), currentrow(0)
 181         {
 182                 rows = 0;
 183                 error = e;
 184         }
 185
 186         ~MySQLresult()
 187         {
 188         }
 189
 190         virtual int Rows()
 191         {
 192                 return rows;
 193         }
 194
 195         virtual int Cols()
 196         {
 197                 return colnames.size();
 198         }
 199
 200         virtual std::string ColName(int column)
 201         {
 202                 if (column < (int)colnames.size())
 203                 {
 204                         return colnames[column];
 205                 }
 206                 else
 207                 {
 208                         throw SQLbadColName();
 209                 }
 210                 return "";
 211         }
 212
 213         virtual int ColNum(const std::string &column)
 214         {
 215                 for (unsigned int i = 0; i < colnames.size(); i++)
 216                 {
 217                         if (column == colnames[i])
 218                                 return i;
 219                 }
 220                 throw SQLbadColName();
 221                 return 0;
 222         }
 223
 224         virtual SQLfield GetValue(int row, int column)
 225         {
 226                 if ((row >= 0) && (row < rows) && (column >= 0) && (column < Cols()))
 227                 {
 228                         return fieldlists[row][column];
 229                 }
 230
 231                 throw SQLbadColName();
 232
 233                 /* XXX: We never actually get here because of the throw */
 234                 return SQLfield("",true);
 235         }
 236
 237         virtual SQLfieldList& GetRow()
 238         {
 239                 if (currentrow < rows)
 240                         return fieldlists[currentrow++];
 241                 else
 242                         return emptyfieldlist;
 243         }
 244
 245         virtual SQLfieldMap& GetRowMap()
 246         {
 247                 fieldmap2.clear();
 248
 249                 if (currentrow < rows)
 250                 {
 251                         for (int i = 0; i < Cols(); i++)
 252                         {
 253                                 fieldmap2.insert(std::make_pair(colnames[i],GetValue(currentrow, i)));
 254                         }
 255                         currentrow++;
 256                 }
 257
 258                 return fieldmap2;
 259         }
 260
 261         virtual SQLfieldList* GetRowPtr()
 262         {
 263                 SQLfieldList* fieldlist = new SQLfieldList();
 264
 265                 if (currentrow < rows)
 266                 {
 267                         for (int i = 0; i < Rows(); i++)
 268                         {
 269                                 fieldlist->push_back(fieldlists[currentrow][i]);
 270                         }
 271                         currentrow++;
 272                 }
 273                 return fieldlist;
 274         }
 275
 276         virtual SQLfieldMap* GetRowMapPtr()
 277         {
 278                 fieldmap = new SQLfieldMap();
 279
 280                 if (currentrow < rows)
 281                 {
 282                         for (int i = 0; i < Cols(); i++)
 283                         {
 284                                 fieldmap->insert(std::make_pair(colnames[i],GetValue(currentrow, i)));
 285                         }
 286                         currentrow++;
 287                 }
 288
 289                 return fieldmap;
 290         }
 291
 292         virtual void Free(SQLfieldMap* fm)
 293         {
 294                 delete fm;
 295         }
 296
 297         virtual void Free(SQLfieldList* fl)
 298         {
 299                 delete fl;
 300         }
 301 };
 302
 303 class SQLConnection;
 304
 305 void NotifyMainThread(SQLConnection* connection_with_new_result);
 306
 307 /** Represents a connection to a mysql database
 308  */
 309 class SQLConnection : public classbase
 310 {
 311  protected:
 312
 313         MYSQL connection;
 314         MYSQL_RES *res;
 315         MYSQL_ROW row;
 316         SQLhost host;
 317         std::map<std::string,std::string> thisrow;
 318         bool Enabled;
 319         ModuleSQL* Parent;
 320
 321  public:
 322
 323         QueryQueue queue;
 324         ResultQueue rq;
 325
 326         // This constructor creates an SQLConnection object with the given credentials, but does not connect yet.
 327         SQLConnection(const SQLhost &hi, ModuleSQL* Creator) : host(hi), Enabled(false), Parent(Creator)
 328         {
 329         }
 330
 331         ~SQLConnection()
 332         {
 333                 Close();
 334         }
 335
 336         // This method connects to the database using the credentials supplied to the constructor, and returns
 337         // true upon success.
 338         bool Connect()
 339         {
 340                 unsigned int timeout = 1;
 341                 mysql_init(&connection);
 342                 mysql_options(&connection,MYSQL_OPT_CONNECT_TIMEOUT,(char*)&timeout);
 343                 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);
 344         }
 345
 346         void DoLeadingQuery()
 347         {
 348                 if (!CheckConnection())
 349                         return;
 350
 351                 /* Parse the command string and dispatch it to mysql */
 352                 SQLrequest& req = queue.front();
 353
 354                 /* Pointer to the buffer we screw around with substitution in */
 355                 char* query;
 356
 357                 /* Pointer to the current end of query, where we append new stuff */
 358                 char* queryend;
 359
 360                 /* Total length of the unescaped parameters */
 361                 unsigned long maxparamlen, paramcount;
 362
 363                 /* Total length of query, used for binary-safety in mysql_real_query */
 364                 unsigned long querylength = 0;
 365
 366                 /* The length of the longest parameter */
 367                 maxparamlen = 0;
 368
 369                 for(ParamL::iterator i = req.query.p.begin(); i != req.query.p.end(); i++)
 370                 {
 371                         if (i->size() > maxparamlen)
 372                                 maxparamlen = i->size();
 373                 }
 374
 375                 /* How many params are there in the query? */
 376                 paramcount = count(req.query.q.c_str(), '?');
 377
 378                 /* This stores copy of params to be inserted with using numbered params 1;3B*/
 379                 ParamL paramscopy(req.query.p);
 380
 381                 /* To avoid a lot of allocations, allocate enough memory for the biggest the escaped query could possibly be.
 382                  * sizeofquery + (maxtotalparamlength*2) + 1
 383                  *
 384                  * The +1 is for null-terminating the string for mysql_real_escape_string
 385                  */
 386
 387                 query = new char[req.query.q.length() + (maxparamlen*paramcount*2) + 1];
 388                 queryend = query;
 389
 390                 /* Okay, now we have a buffer large enough we need to start copying the query into it and escaping and substituting
 391                  * the parameters into it...
 392                  */
 393
 394                 for(unsigned long i = 0; i < req.query.q.length(); i++)
 395                 {
 396                         if(req.query.q[i] == '?')
 397                         {
 398                                 /* We found a place to substitute..what fun.
 399                                  * use mysql calls to escape and write the
 400                                  * escaped string onto the end of our query buffer,
 401                                  * then we "just" need to make sure queryend is
 402                                  * pointing at the right place.
 403                                  */
 404
 405                                 /* Is it numbered parameter?
 406                                  */
 407
 408                                 bool numbered;
 409                                 numbered = false;
 410
 411                                 /* Numbered parameter number :|
 412                                  */
 413                                 unsigned int paramnum;
 414                                 paramnum = 0;
 415
 416                                 /* Let's check if it's a numbered param. And also calculate it's number.
 417                                  */
 418
 419                                 while ((i < req.query.q.length() - 1) && (req.query.q[i+1] >= '0') && (req.query.q[i+1] <= '9'))
 420                                 {
 421                                         numbered = true;
 422                                         ++i;
 423                                         paramnum = paramnum * 10 + req.query.q[i] - '0';
 424                                 }
 425
 426                                 if (paramnum > paramscopy.size() - 1)
 427                                 {
 428                                         /* index is out of range!
 429                                          */
 430                                         numbered = false;
 431                                 }
 432
 433                                 if (numbered)
 434                                 {
 435                                         unsigned long len = mysql_real_escape_string(&connection, queryend, paramscopy[paramnum].c_str(), paramscopy[paramnum].length());
 436
 437                                         queryend += len;
 438                                 }
 439                                 else if (req.query.p.size())
 440                                 {
 441                                         unsigned long len = mysql_real_escape_string(&connection, queryend, req.query.p.front().c_str(), req.query.p.front().length());
 442
 443                                         queryend += len;
 444                                         req.query.p.pop_front();
 445                                 }
 446                                 else
 447                                         break;
 448                         }
 449                         else
 450                         {
 451                                 *queryend = req.query.q[i];
 452                                 queryend++;
 453                         }
 454                         querylength++;
 455                 }
 456
 457                 *queryend = 0;
 458
 459                 Parent->QueueMutex->Lock();
 460                 req.query.q = query;
 461                 Parent->QueueMutex->Unlock();
 462
 463                 if (!mysql_real_query(&connection, req.query.q.data(), req.query.q.length()))
 464                 {
 465                         /* Successfull query */
 466                         res = mysql_use_result(&connection);
 467                         unsigned long rows = mysql_affected_rows(&connection);
 468                         MySQLresult* r = new MySQLresult(Parent, req.GetSource(), res, rows, req.id);
 469                         r->dbid = this->GetID();
 470                         r->query = req.query.q;
 471                         /* Put this new result onto the results queue.
 472                          * XXX: Remember to mutex the queue!
 473                          */
 474                         Parent->ResultsMutex->Lock();
 475                         rq.push_back(r);
 476                         Parent->ResultsMutex->Unlock();
 477                 }
 478                 else
 479                 {
 480                         /* XXX: See /usr/include/mysql/mysqld_error.h for a list of
 481                          * possible error numbers and error messages */
 482                         SQLerror e(SQL_QREPLY_FAIL, ConvToStr(mysql_errno(&connection)) + std::string(": ") + mysql_error(&connection));
 483                         MySQLresult* r = new MySQLresult(Parent, req.GetSource(), e, req.id);
 484                         r->dbid = this->GetID();
 485                         r->query = req.query.q;
 486
 487                         Parent->ResultsMutex->Lock();
 488                         rq.push_back(r);
 489                         Parent->ResultsMutex->Unlock();
 490                 }
 491
 492                 /* Now signal the main thread that we've got a result to process.
 493                  * Pass them this connection id as what to examine
 494                  */
 495
 496                 delete[] query;
 497
 498                 NotifyMainThread(this);
 499         }
 500
 501         bool ConnectionLost()
 502         {
 503                 if (&connection)
 504                 {
 505                         return (mysql_ping(&connection) != 0);
 506                 }
 507                 else return false;
 508         }
 509
 510         bool CheckConnection()
 511         {
 512                 if (ConnectionLost())
 513                 {
 514                         return Connect();
 515                 }
 516                 else return true;
 517         }
 518
 519         std::string GetError()
 520         {
 521                 return mysql_error(&connection);
 522         }
 523
 524         const std::string& GetID()
 525         {
 526                 return host.id;
 527         }
 528
 529         std::string GetHost()
 530         {
 531                 return host.host;
 532         }
 533
 534         void SetEnable(bool Enable)
 535         {
 536                 Enabled = Enable;
 537         }
 538
 539         bool IsEnabled()
 540         {
 541                 return Enabled;
 542         }
 543
 544         void Close()
 545         {
 546                 mysql_close(&connection);
 547         }
 548
 549         const SQLhost& GetConfHost()
 550         {
 551                 return host;
 552         }
 553
 554 };
 555
 556 ConnMap Connections;
 557
 558 bool HasHost(const SQLhost &host)
 559 {
 560         for (ConnMap::iterator iter = Connections.begin(); iter != Connections.end(); iter++)
 561         {
 562                 if (host == iter->second->GetConfHost())
 563                         return true;
 564         }
 565         return false;
 566 }
 567
 568 bool HostInConf(ConfigReader* conf, const SQLhost &h)
 569 {
 570         for(int i = 0; i < conf->Enumerate("database"); i++)
 571         {
 572                 SQLhost host;
 573                 host.id         = conf->ReadValue("database", "id", i);
 574                 host.host       = conf->ReadValue("database", "hostname", i);
 575                 host.port       = conf->ReadInteger("database", "port", i, true);
 576                 host.name       = conf->ReadValue("database", "name", i);
 577                 host.user       = conf->ReadValue("database", "username", i);
 578                 host.pass       = conf->ReadValue("database", "password", i);
 579                 host.ssl        = conf->ReadFlag("database", "ssl", i);
 580                 if (h == host)
 581                         return true;
 582         }
 583         return false;
 584 }
 585
 586 void ClearOldConnections(ConfigReader* conf)
 587 {
 588         ConnMap::iterator i,safei;
 589         for (i = Connections.begin(); i != Connections.end(); i++)
 590         {
 591                 if (!HostInConf(conf, i->second->GetConfHost()))
 592                 {
 593                         delete i->second;
 594                         safei = i;
 595                         --i;
 596                         Connections.erase(safei);
 597                 }
 598         }
 599 }
 600
 601 void ClearAllConnections()
 602 {
 603         ConnMap::iterator i;
 604         while ((i = Connections.begin()) != Connections.end())
 605         {
 606                 Connections.erase(i);
 607                 delete i->second;
 608         }
 609 }
 610
 611 void ConnectDatabases(InspIRCd* ServerInstance, ModuleSQL* Parent)
 612 {
 613         for (ConnMap::iterator i = Connections.begin(); i != Connections.end(); i++)
 614         {
 615                 if (i->second->IsEnabled())
 616                         continue;
 617
 618                 i->second->SetEnable(true);
 619                 if (!i->second->Connect())
 620                 {
 621                         /* XXX: MUTEX */
 622                         Parent->LoggingMutex->Lock();
 623                         ServerInstance->Logs->Log("m_mysql",DEFAULT,"SQL: Failed to connect database "+i->second->GetHost()+": Error: "+i->second->GetError());
 624                         i->second->SetEnable(false);
 625                         Parent->LoggingMutex->Unlock();
 626                 }
 627         }
 628 }
 629
 630 void LoadDatabases(ConfigReader* conf, InspIRCd* ServerInstance, ModuleSQL* Parent)
 631 {
 632         Parent->ConnMutex->Lock();
 633         ClearOldConnections(conf);
 634         for (int j =0; j < conf->Enumerate("database"); j++)
 635         {
 636                 SQLhost host;
 637                 host.id         = conf->ReadValue("database", "id", j);
 638                 host.host       = conf->ReadValue("database", "hostname", j);
 639                 host.port       = conf->ReadInteger("database", "port", j, true);
 640                 host.name       = conf->ReadValue("database", "name", j);
 641                 host.user       = conf->ReadValue("database", "username", j);
 642                 host.pass       = conf->ReadValue("database", "password", j);
 643                 host.ssl        = conf->ReadFlag("database", "ssl", j);
 644
 645                 if (HasHost(host))
 646                         continue;
 647
 648                 if (!host.id.empty() && !host.host.empty() && !host.name.empty() && !host.user.empty() && !host.pass.empty())
 649                 {
 650                         SQLConnection* ThisSQL = new SQLConnection(host, Parent);
 651                         Connections[host.id] = ThisSQL;
 652                 }
 653         }
 654         ConnectDatabases(ServerInstance, Parent);
 655         Parent->ConnMutex->Unlock();
 656 }
 657
 658 char FindCharId(const std::string &id)
 659 {
 660         char i = 1;
 661         for (ConnMap::iterator iter = Connections.begin(); iter != Connections.end(); ++iter, ++i)
 662         {
 663                 if (iter->first == id)
 664                 {
 665                         return i;
 666                 }
 667         }
 668         return 0;
 669 }
 670
 671 ConnMap::iterator GetCharId(char id)
 672 {
 673         char i = 1;
 674         for (ConnMap::iterator iter = Connections.begin(); iter != Connections.end(); ++iter, ++i)
 675         {
 676                 if (i == id)
 677                         return iter;
 678         }
 679         return Connections.end();
 680 }
 681
 682 void NotifyMainThread(SQLConnection* connection_with_new_result)
 683 {
 684         /* Here we write() to the socket the main thread has open
 685          * and we connect()ed back to before our thread became active.
 686          * The main thread is using a nonblocking socket tied into
 687          * the socket engine, so they wont block and they'll receive
 688          * nearly instant notification. Because we're in a seperate
 689          * thread, we can just use standard connect(), and we can
 690          * block if we like. We just send the connection id of the
 691          * connection back.
 692          *
 693          * NOTE: We only send a single char down the connection, this
 694          * way we know it wont get a partial read at the other end if
 695          * the system is especially congested (see bug #263).
 696          * The function FindCharId translates a connection name into a
 697          * one character id, and GetCharId translates a character id
 698          * back into an iterator.
 699          */
 700         char id = FindCharId(connection_with_new_result->GetID());
 701         send(QueueFD, &id, 1, 0);
 702 }
 703
 704 class ModuleSQL;
 705
 706 class DispatcherThread : public Thread
 707 {
 708  private:
 709         ModuleSQL* Parent;
 710         InspIRCd* ServerInstance;
 711  public:
 712         DispatcherThread(InspIRCd* Instance, ModuleSQL* CreatorModule) : Thread(), Parent(CreatorModule), ServerInstance(Instance) { }
 713         ~DispatcherThread() { }
 714         virtual void Run();
 715 };
 716
 717 /** Used by m_mysql to notify one thread when the other has a result
 718  */
 719 class Notifier : public BufferedSocket
 720 {
 721         ModuleSQL* Parent;
 722
 723  public:
 724         Notifier(ModuleSQL* P, InspIRCd* SI, int newfd, char* ip) : BufferedSocket(SI, newfd, ip), Parent(P) { }
 725
 726         virtual bool OnDataReady()
 727         {
 728                 char data = 0;
 729                 /* NOTE: Only a single character is read so we know we
 730                  * cant get a partial read. (We've been told that theres
 731                  * data waiting, so we wont ever get EAGAIN)
 732                  * The function GetCharId translates a single character
 733                  * back into an iterator.
 734                  */
 735
 736                 if (ServerInstance->SE->Recv(this, &data, 1, 0) > 0)
 737                 {
 738                         Parent->ConnMutex->Lock();
 739                         ConnMap::iterator iter = GetCharId(data);
 740                         if (iter != Connections.end())
 741                         {
 742                                 /* Lock the mutex, send back the data */
 743                                 Parent->ResultsMutex->Lock();
 744                                 ResultQueue::iterator n = iter->second->rq.begin();
 745                                 (*n)->Send();
 746                                 delete (*n);
 747                                 iter->second->rq.pop_front();
 748                                 Parent->ResultsMutex->Unlock();
 749                                 Parent->ConnMutex->Unlock();
 750                                 return true;
 751                         }
 752                         /* No error, but unknown id */
 753                         Parent->ConnMutex->Unlock();
 754                         return true;
 755                 }
 756
 757                 /* Erk, error on descriptor! */
 758                 return false;
 759         }
 760 };
 761
 762 /** Spawn sockets from a listener
 763  */
 764 class MySQLListener : public ListenSocketBase
 765 {
 766         ModuleSQL* Parent;
 767         irc::sockets::insp_sockaddr sock_us;
 768         socklen_t uslen;
 769         FileReader* index;
 770
 771  public:
 772         MySQLListener(ModuleSQL* P, InspIRCd* Instance, int port, const std::string &addr) : ListenSocketBase(Instance, port, addr), Parent(P)
 773         {
 774                 uslen = sizeof(sock_us);
 775                 if (getsockname(this->fd,(sockaddr*)&sock_us,&uslen))
 776                 {
 777                         throw ModuleException("Could not getsockname() to find out port number for ITC port");
 778                 }
 779         }
 780
 781         virtual void OnAcceptReady(const std::string &ipconnectedto, int nfd, const std::string &incomingip)
 782         {
 783                 // XXX unsafe casts suck
 784                 new Notifier(this->Parent, this->ServerInstance, nfd, (char *)ipconnectedto.c_str());
 785         }
 786
 787         /* Using getsockname and ntohs, we can determine which port number we were allocated */
 788         int GetPort()
 789         {
 790 #ifdef IPV6
 791                 return ntohs(sock_us.sin6_port);
 792 #else
 793                 return ntohs(sock_us.sin_port);
 794 #endif
 795         }
 796 };
 797
 798 ModuleSQL::ModuleSQL(InspIRCd* Me) : Module(Me), rehashing(false)
 799 {
 800         ServerInstance->Modules->UseInterface("SQLutils");
 801
 802         Conf = new ConfigReader(ServerInstance);
 803         PublicServerInstance = ServerInstance;
 804         currid = 0;
 805
 806         /* Create a socket on a random port. Let the tcp stack allocate us an available port */
 807 #ifdef IPV6
 808         MessagePipe = new MySQLListener(this, ServerInstance, 0, "::1");
 809 #else
 810         MessagePipe = new MySQLListener(this, ServerInstance, 0, "127.0.0.1");
 811 #endif
 812
 813         LoggingMutex = ServerInstance->Mutexes->CreateMutex();
 814         ConnMutex = ServerInstance->Mutexes->CreateMutex();
 815
 816         if (MessagePipe->GetFd() == -1)
 817         {
 818                 delete ConnMutex;
 819                 ServerInstance->Modules->DoneWithInterface("SQLutils");
 820                 throw ModuleException("m_mysql: unable to create ITC pipe");
 821         }
 822         else
 823         {
 824                 LoggingMutex->Lock();
 825                 ServerInstance->Logs->Log("m_mysql", DEBUG, "MySQL: Interthread comms port is %d", MessagePipe->GetPort());
 826                 LoggingMutex->Unlock();
 827         }
 828
 829         Dispatcher = new DispatcherThread(ServerInstance, this);
 830         ServerInstance->Threads->Create(Dispatcher);
 831
 832         ResultsMutex = ServerInstance->Mutexes->CreateMutex();
 833         QueueMutex = ServerInstance->Mutexes->CreateMutex();
 834
 835         if (!ServerInstance->Modules->PublishFeature("SQL", this))
 836         {
 837                 /* Tell worker thread to exit NOW,
 838                  * Automatically joins */
 839                 delete Dispatcher;
 840                 delete LoggingMutex;
 841                 delete ResultsMutex;
 842                 delete QueueMutex;
 843                 delete ConnMutex;
 844                 ServerInstance->Modules->DoneWithInterface("SQLutils");
 845                 throw ModuleException("m_mysql: Unable to publish feature 'SQL'");
 846         }
 847
 848         ServerInstance->Modules->PublishInterface("SQL", this);
 849         Implementation eventlist[] = { I_OnRehash, I_OnRequest };
 850         ServerInstance->Modules->Attach(eventlist, this, 2);
 851 }
 852
 853 ModuleSQL::~ModuleSQL()
 854 {
 855         delete Dispatcher;
 856         ClearAllConnections();
 857         delete Conf;
 858         ServerInstance->Modules->UnpublishInterface("SQL", this);
 859         ServerInstance->Modules->UnpublishFeature("SQL");
 860         ServerInstance->Modules->DoneWithInterface("SQLutils");
 861         delete LoggingMutex;
 862         delete ResultsMutex;
 863         delete QueueMutex;
 864         delete ConnMutex;
 865 }
 866
 867 unsigned long ModuleSQL::NewID()
 868 {
 869         if (currid+1 == 0)
 870                 currid++;
 871         return ++currid;
 872 }
 873
 874 const char* ModuleSQL::OnRequest(Request* request)
 875 {
 876         if(strcmp(SQLREQID, request->GetId()) == 0)
 877         {
 878                 SQLrequest* req = (SQLrequest*)request;
 879
 880                 /* XXX: Lock */
 881                 QueueMutex->Lock();
 882
 883                 ConnMap::iterator iter;
 884
 885                 const char* returnval = NULL;
 886
 887                 ConnMutex->Lock();
 888                 if((iter = Connections.find(req->dbid)) != Connections.end())
 889                 {
 890                         req->id = NewID();
 891                         iter->second->queue.push(*req);
 892                         returnval = SQLSUCCESS;
 893                 }
 894                 else
 895                 {
 896                         req->error.Id(SQL_BAD_DBID);
 897                 }
 898
 899                 ConnMutex->Unlock();
 900                 QueueMutex->Unlock();
 901
 902                 return returnval;
 903         }
 904
 905         return NULL;
 906 }
 907
 908 void ModuleSQL::OnRehash(User* user, const std::string &parameter)
 909 {
 910         rehashing = true;
 911 }
 912
 913 Version ModuleSQL::GetVersion()
 914 {
 915         return Version("$Id$", VF_VENDOR | VF_SERVICEPROVIDER, API_VERSION);
 916 }
 917
 918 void DispatcherThread::Run()
 919 {
 920         LoadDatabases(Parent->Conf, Parent->PublicServerInstance, Parent);
 921
 922         /* Connect back to the Notifier */
 923
 924         if ((QueueFD = socket(AF_FAMILY, SOCK_STREAM, 0)) == -1)
 925         {
 926                 /* crap, we're out of sockets... */
 927                 return;
 928         }
 929
 930         irc::sockets::insp_sockaddr addr;
 931
 932 #ifdef IPV6
 933         irc::sockets::insp_aton("::1", &addr.sin6_addr);
 934         addr.sin6_family = AF_FAMILY;
 935         addr.sin6_port = htons(MessagePipe->GetPort());
 936 #else
 937         irc::sockets::insp_inaddr ia;
 938         irc::sockets::insp_aton("127.0.0.1", &ia);
 939         addr.sin_family = AF_FAMILY;
 940         addr.sin_addr = ia;
 941         addr.sin_port = htons(MessagePipe->GetPort());
 942 #endif
 943
 944         if (connect(QueueFD, (sockaddr*)&addr,sizeof(addr)) == -1)
 945         {
 946                 /* wtf, we cant connect to it, but we just created it! */
 947                 return;
 948         }
 949
 950         while (this->GetExitFlag() == false)
 951         {
 952                 if (Parent->rehashing)
 953                 {
 954                 /* XXX: Lock */
 955                         Parent->QueueMutex->Lock();
 956                         Parent->rehashing = false;
 957                         LoadDatabases(Parent->Conf, Parent->PublicServerInstance, Parent);
 958                         Parent->QueueMutex->Unlock();
 959                         /* XXX: Unlock */
 960                 }
 961
 962                 SQLConnection* conn = NULL;
 963                 /* XXX: Lock here for safety */
 964                 Parent->QueueMutex->Lock();
 965                 Parent->ConnMutex->Lock();
 966                 for (ConnMap::iterator i = Connections.begin(); i != Connections.end(); i++)
 967                 {
 968                         if (i->second->queue.totalsize())
 969                         {
 970                                 conn = i->second;
 971                                 break;
 972                         }
 973                 }
 974                 Parent->ConnMutex->Unlock();
 975                 Parent->QueueMutex->Unlock();
 976                 /* XXX: Unlock */
 977
 978                 /* Theres an item! */
 979                 if (conn)
 980                 {
 981                         conn->DoLeadingQuery();
 982
 983                         /* XXX: Lock */
 984                         Parent->QueueMutex->Lock();
 985                         conn->queue.pop();
 986                         Parent->QueueMutex->Unlock();
 987                         /* XXX: Unlock */
 988                 }
 989
 990                 usleep(1000);
 991         }
 992 }
 993
 994
 995 MODULE_INIT(ModuleSQL)