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