src/modules/extra/m_mysql.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd is copyright (C) 2002-2004 ChatSpike-Dev.
   6  *                     E-mail:
   7  *              <brain@chatspike.net>
   8  *                <Craig@chatspike.net>
   9  *
  10  * Written by Craig Edwards, Craig McLure, and others.
  11  * This program is free but copyrighted software; see
  12  *          the file COPYING for details.
  13  *
  14  * ---------------------------------------------------
  15  */
  16
  17 using namespace std;
  18
  19 #include <stdio.h>
  20 #include <string>
  21 #include <mysql.h>
  22 #include <pthread.h>
  23 #include "users.h"
  24 #include "channels.h"
  25 #include "modules.h"
  26 #include "inspircd.h"
  27 #include "m_sqlv2.h"
  28
  29 /* VERSION 2 API: With nonblocking (threaded) requests */
  30
  31 /* $ModDesc: SQL Service Provider module for all other m_sql* modules */
  32 /* $CompileFlags: `mysql_config --include` */
  33 /* $LinkerFlags: `mysql_config --libs_r` `perl extra/mysql_rpath.pl` */
  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 pthreads, 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 Notifier;
  72
  73
  74 typedef std::map<std::string, SQLConnection*> ConnMap;
  75 bool giveup = false;
  76 static Module* SQLModule = NULL;
  77 static Notifier* MessagePipe = NULL;
  78 int QueueFD = -1;
  79
  80
  81 #if !defined(MYSQL_VERSION_ID) || MYSQL_VERSION_ID<32224
  82 #define mysql_field_count mysql_num_fields
  83 #endif
  84
  85 typedef std::deque<SQLresult*> ResultQueue;
  86
  87 /** Represents a mysql query queue
  88  */
  89 class QueryQueue : public classbase
  90 {
  91 private:
  92         typedef std::deque<SQLrequest> ReqDeque;
  93
  94         ReqDeque priority;      /* The priority queue */
  95         ReqDeque normal;        /* The 'normal' queue */
  96         enum { PRI, NOR, NON } which;   /* Which queue the currently active element is at the front of */
  97
  98 public:
  99         QueryQueue()
 100         : which(NON)
 101         {
 102         }
 103
 104         void push(const SQLrequest &q)
 105         {
 106                 if(q.pri)
 107                         priority.push_back(q);
 108                 else
 109                         normal.push_back(q);
 110         }
 111
 112         void pop()
 113         {
 114                 if((which == PRI) && priority.size())
 115                 {
 116                         priority.pop_front();
 117                 }
 118                 else if((which == NOR) && normal.size())
 119                 {
 120                         normal.pop_front();
 121                 }
 122
 123                 /* Reset this */
 124                 which = NON;
 125
 126                 /* Silently do nothing if there was no element to pop() */
 127         }
 128
 129         SQLrequest& front()
 130         {
 131                 switch(which)
 132                 {
 133                         case PRI:
 134                                 return priority.front();
 135                         case NOR:
 136                                 return normal.front();
 137                         default:
 138                                 if(priority.size())
 139                                 {
 140                                         which = PRI;
 141                                         return priority.front();
 142                                 }
 143
 144                                 if(normal.size())
 145                                 {
 146                                         which = NOR;
 147                                         return normal.front();
 148                                 }
 149
 150                                 /* This will probably result in a segfault,
 151                                  * but the caller should have checked totalsize()
 152                                  * first so..meh - moron :p
 153                                  */
 154
 155                                 return priority.front();
 156                 }
 157         }
 158
 159         std::pair<int, int> size()
 160         {
 161                 return std::make_pair(priority.size(), normal.size());
 162         }
 163
 164         int totalsize()
 165         {
 166                 return priority.size() + normal.size();
 167         }
 168
 169         void PurgeModule(Module* mod)
 170         {
 171                 DoPurgeModule(mod, priority);
 172                 DoPurgeModule(mod, normal);
 173         }
 174
 175 private:
 176         void DoPurgeModule(Module* mod, ReqDeque& q)
 177         {
 178                 for(ReqDeque::iterator iter = q.begin(); iter != q.end(); iter++)
 179                 {
 180                         if(iter->GetSource() == mod)
 181                         {
 182                                 if(iter->id == front().id)
 183                                 {
 184                                         /* It's the currently active query.. :x */
 185                                         iter->SetSource(NULL);
 186                                 }
 187                                 else
 188                                 {
 189                                         /* It hasn't been executed yet..just remove it */
 190                                         iter = q.erase(iter);
 191                                 }
 192                         }
 193                 }
 194         }
 195 };
 196
 197 /* A mutex to wrap around queue accesses */
 198 pthread_mutex_t queue_mutex = PTHREAD_MUTEX_INITIALIZER;
 199
 200 pthread_mutex_t results_mutex = PTHREAD_MUTEX_INITIALIZER;
 201
 202 /** Represents a mysql result set
 203  */
 204 class MySQLresult : public SQLresult
 205 {
 206         int currentrow;
 207         //std::vector<std::map<std::string,std::string> > results;
 208         std::vector<std::string> colnames;
 209         std::vector<SQLfieldList> fieldlists;
 210         SQLfieldMap* fieldmap;
 211         SQLfieldMap fieldmap2;
 212         SQLfieldList emptyfieldlist;
 213         int rows;
 214  public:
 215
 216         MySQLresult(Module* self, Module* to, MYSQL_RES* res, int affected_rows, unsigned int id) : SQLresult(self, to, id), currentrow(0), fieldmap(NULL)
 217         {
 218                 /* A number of affected rows from from mysql_affected_rows.
 219                  */
 220                 fieldlists.clear();
 221                 rows = 0;
 222                 if (affected_rows >= 1)
 223                 {
 224                         rows = affected_rows;
 225                         fieldlists.resize(rows);
 226                 }
 227                 unsigned int field_count = 0;
 228                 if (res)
 229                 {
 230                         MYSQL_ROW row;
 231                         int n = 0;
 232                         while ((row = mysql_fetch_row(res)))
 233                         {
 234                                 if (fieldlists.size() < (unsigned int)rows+1)
 235                                 {
 236                                         fieldlists.resize(fieldlists.size()+1);
 237                                 }
 238                                 field_count = 0;
 239                                 MYSQL_FIELD *fields = mysql_fetch_fields(res);
 240                                 if(mysql_num_fields(res) == 0)
 241                                         break;
 242                                 if (fields && mysql_num_fields(res))
 243                                 {
 244                                         colnames.clear();
 245                                         while (field_count < mysql_num_fields(res))
 246                                         {
 247                                                 std::string a = (fields[field_count].name ? fields[field_count].name : "");
 248                                                 std::string b = (row[field_count] ? row[field_count] : "");
 249                                                 SQLfield sqlf(b, !row[field_count]);
 250                                                 colnames.push_back(a);
 251                                                 fieldlists[n].push_back(sqlf);
 252                                                 field_count++;
 253                                         }
 254                                         n++;
 255                                 }
 256                                 rows++;
 257                         }
 258                         mysql_free_result(res);
 259                 }
 260         }
 261
 262         MySQLresult(Module* self, Module* to, SQLerror e, unsigned int id) : SQLresult(self, to, id), currentrow(0)
 263         {
 264                 rows = 0;
 265                 error = e;
 266         }
 267
 268         ~MySQLresult()
 269         {
 270         }
 271
 272         virtual int Rows()
 273         {
 274                 return rows;
 275         }
 276
 277         virtual int Cols()
 278         {
 279                 return colnames.size();
 280         }
 281
 282         virtual std::string ColName(int column)
 283         {
 284                 if (column < (int)colnames.size())
 285                 {
 286                         return colnames[column];
 287                 }
 288                 else
 289                 {
 290                         throw SQLbadColName();
 291                 }
 292                 return "";
 293         }
 294
 295         virtual int ColNum(const std::string &column)
 296         {
 297                 for (unsigned int i = 0; i < colnames.size(); i++)
 298                 {
 299                         if (column == colnames[i])
 300                                 return i;
 301                 }
 302                 throw SQLbadColName();
 303                 return 0;
 304         }
 305
 306         virtual SQLfield GetValue(int row, int column)
 307         {
 308                 if ((row >= 0) && (row < rows) && (column >= 0) && (column < Cols()))
 309                 {
 310                         return fieldlists[row][column];
 311                 }
 312
 313                 throw SQLbadColName();
 314
 315                 /* XXX: We never actually get here because of the throw */
 316                 return SQLfield("",true);
 317         }
 318
 319         virtual SQLfieldList& GetRow()
 320         {
 321                 if (currentrow < rows)
 322                         return fieldlists[currentrow];
 323                 else
 324                         return emptyfieldlist;
 325         }
 326
 327         virtual SQLfieldMap& GetRowMap()
 328         {
 329                 fieldmap2.clear();
 330
 331                 if (currentrow < rows)
 332                 {
 333                         for (int i = 0; i < Cols(); i++)
 334                         {
 335                                 fieldmap2.insert(std::make_pair(colnames[i],GetValue(currentrow, i)));
 336                         }
 337                         currentrow++;
 338                 }
 339
 340                 return fieldmap2;
 341         }
 342
 343         virtual SQLfieldList* GetRowPtr()
 344         {
 345                 SQLfieldList* fieldlist = new SQLfieldList();
 346
 347                 if (currentrow < rows)
 348                 {
 349                         for (int i = 0; i < Rows(); i++)
 350                         {
 351                                 fieldlist->push_back(fieldlists[currentrow][i]);
 352                         }
 353                         currentrow++;
 354                 }
 355                 return fieldlist;
 356         }
 357
 358         virtual SQLfieldMap* GetRowMapPtr()
 359         {
 360                 fieldmap = new SQLfieldMap();
 361
 362                 if (currentrow < rows)
 363                 {
 364                         for (int i = 0; i < Cols(); i++)
 365                         {
 366                                 fieldmap->insert(std::make_pair(colnames[i],GetValue(currentrow, i)));
 367                         }
 368                         currentrow++;
 369                 }
 370
 371                 return fieldmap;
 372         }
 373
 374         virtual void Free(SQLfieldMap* fm)
 375         {
 376                 delete fm;
 377         }
 378
 379         virtual void Free(SQLfieldList* fl)
 380         {
 381                 delete fl;
 382         }
 383 };
 384
 385 class SQLConnection;
 386
 387 void NotifyMainThread(SQLConnection* connection_with_new_result);
 388
 389 /** Represents a connection to a mysql database
 390  */
 391 class SQLConnection : public classbase
 392 {
 393  protected:
 394
 395         MYSQL connection;
 396         MYSQL_RES *res;
 397         MYSQL_ROW row;
 398         std::string host;
 399         std::string user;
 400         std::string pass;
 401         std::string db;
 402         std::map<std::string,std::string> thisrow;
 403         bool Enabled;
 404         std::string id;
 405
 406  public:
 407
 408         QueryQueue queue;
 409         ResultQueue rq;
 410
 411         // This constructor creates an SQLConnection object with the given credentials, but does not connect yet.
 412         SQLConnection(const std::string &thishost, const std::string &thisuser, const std::string &thispass, const std::string &thisdb, const std::string &myid) : host(thishost), user(thisuser), pass(thispass), db(thisdb), Enabled(true), id(myid)
 413         {
 414         }
 415
 416         // This method connects to the database using the credentials supplied to the constructor, and returns
 417         // true upon success.
 418         bool Connect()
 419         {
 420                 unsigned int timeout = 1;
 421                 mysql_init(&connection);
 422                 mysql_options(&connection,MYSQL_OPT_CONNECT_TIMEOUT,(char*)&timeout);
 423                 return mysql_real_connect(&connection, host.c_str(), user.c_str(), pass.c_str(), db.c_str(), 0, NULL, 0);
 424         }
 425
 426         void DoLeadingQuery()
 427         {
 428                 if (!CheckConnection())
 429                         return;
 430
 431                 /* Parse the command string and dispatch it to mysql */
 432                 SQLrequest& req = queue.front();
 433
 434                 /* Pointer to the buffer we screw around with substitution in */
 435                 char* query;
 436
 437                 /* Pointer to the current end of query, where we append new stuff */
 438                 char* queryend;
 439
 440                 /* Total length of the unescaped parameters */
 441                 unsigned long paramlen;
 442
 443                 /* Total length of query, used for binary-safety in mysql_real_query */
 444                 unsigned long querylength = 0;
 445
 446                 paramlen = 0;
 447
 448                 for(ParamL::iterator i = req.query.p.begin(); i != req.query.p.end(); i++)
 449                 {
 450                         paramlen += i->size();
 451                 }
 452
 453                 /* To avoid a lot of allocations, allocate enough memory for the biggest the escaped query could possibly be.
 454                  * sizeofquery + (totalparamlength*2) + 1
 455                  *
 456                  * The +1 is for null-terminating the string for mysql_real_escape_string
 457                  */
 458
 459                 query = new char[req.query.q.length() + (paramlen*2)];
 460                 queryend = query;
 461
 462                 /* Okay, now we have a buffer large enough we need to start copying the query into it and escaping and substituting
 463                  * the parameters into it...
 464                  */
 465
 466                 for(unsigned long i = 0; i < req.query.q.length(); i++)
 467                 {
 468                         if(req.query.q[i] == '?')
 469                         {
 470                                 /* We found a place to substitute..what fun.
 471                                  * use mysql calls to escape and write the
 472                                  * escaped string onto the end of our query buffer,
 473                                  * then we "just" need to make sure queryend is
 474                                  * pointing at the right place.
 475                                  */
 476                                 if(req.query.p.size())
 477                                 {
 478                                         unsigned long len = mysql_real_escape_string(&connection, queryend, req.query.p.front().c_str(), req.query.p.front().length());
 479
 480                                         queryend += len;
 481                                         req.query.p.pop_front();
 482                                 }
 483                                 else
 484                                         break;
 485                         }
 486                         else
 487                         {
 488                                 *queryend = req.query.q[i];
 489                                 queryend++;
 490                         }
 491                         querylength++;
 492                 }
 493
 494                 *queryend = 0;
 495
 496                 pthread_mutex_lock(&queue_mutex);
 497                 req.query.q = query;
 498                 pthread_mutex_unlock(&queue_mutex);
 499
 500                 if (!mysql_real_query(&connection, req.query.q.data(), req.query.q.length()))
 501                 {
 502                         /* Successfull query */
 503                         res = mysql_use_result(&connection);
 504                         unsigned long rows = mysql_affected_rows(&connection);
 505                         MySQLresult* r = new MySQLresult(SQLModule, req.GetSource(), res, rows, req.id);
 506                         r->dbid = this->GetID();
 507                         r->query = req.query.q;
 508                         /* Put this new result onto the results queue.
 509                          * XXX: Remember to mutex the queue!
 510                          */
 511                         pthread_mutex_lock(&results_mutex);
 512                         rq.push_back(r);
 513                         pthread_mutex_unlock(&results_mutex);
 514                 }
 515                 else
 516                 {
 517                         /* XXX: See /usr/include/mysql/mysqld_error.h for a list of
 518                          * possible error numbers and error messages */
 519                         SQLerror e(QREPLY_FAIL, ConvToStr(mysql_errno(&connection)) + std::string(": ") + mysql_error(&connection));
 520                         MySQLresult* r = new MySQLresult(SQLModule, req.GetSource(), e, req.id);
 521                         r->dbid = this->GetID();
 522                         r->query = req.query.q;
 523
 524                         pthread_mutex_lock(&results_mutex);
 525                         rq.push_back(r);
 526                         pthread_mutex_unlock(&results_mutex);
 527                 }
 528
 529                 /* Now signal the main thread that we've got a result to process.
 530                  * Pass them this connection id as what to examine
 531                  */
 532
 533                 delete[] query;
 534
 535                 NotifyMainThread(this);
 536         }
 537
 538         bool ConnectionLost()
 539         {
 540                 if (&connection) {
 541                         return (mysql_ping(&connection) != 0);
 542                 }
 543                 else return false;
 544         }
 545
 546         bool CheckConnection()
 547         {
 548                 if (ConnectionLost()) {
 549                         return Connect();
 550                 }
 551                 else return true;
 552         }
 553
 554         std::string GetError()
 555         {
 556                 return mysql_error(&connection);
 557         }
 558
 559         const std::string& GetID()
 560         {
 561                 return id;
 562         }
 563
 564         std::string GetHost()
 565         {
 566                 return host;
 567         }
 568
 569         void SetEnable(bool Enable)
 570         {
 571                 Enabled = Enable;
 572         }
 573
 574         bool IsEnabled()
 575         {
 576                 return Enabled;
 577         }
 578
 579 };
 580
 581 ConnMap Connections;
 582
 583 void ConnectDatabases(InspIRCd* ServerInstance)
 584 {
 585         for (ConnMap::iterator i = Connections.begin(); i != Connections.end(); i++)
 586         {
 587                 i->second->SetEnable(true);
 588                 if (i->second->Connect())
 589                 {
 590                         ServerInstance->Log(DEFAULT,"SQL: Successfully connected database "+i->second->GetHost());
 591                 }
 592                 else
 593                 {
 594                         ServerInstance->Log(DEFAULT,"SQL: Failed to connect database "+i->second->GetHost()+": Error: "+i->second->GetError());
 595                         i->second->SetEnable(false);
 596                 }
 597         }
 598 }
 599
 600
 601 void LoadDatabases(ConfigReader* ThisConf, InspIRCd* ServerInstance)
 602 {
 603         ServerInstance->Log(DEFAULT,"SQL: Loading database settings");
 604         Connections.clear();
 605         ServerInstance->Log(DEBUG,"Cleared connections");
 606         for (int j =0; j < ThisConf->Enumerate("database"); j++)
 607         {
 608                 std::string db = ThisConf->ReadValue("database","name",j);
 609                 std::string user = ThisConf->ReadValue("database","username",j);
 610                 std::string pass = ThisConf->ReadValue("database","password",j);
 611                 std::string host = ThisConf->ReadValue("database","hostname",j);
 612                 std::string id = ThisConf->ReadValue("database","id",j);
 613                 ServerInstance->Log(DEBUG,"Read database settings");
 614                 if ((db != "") && (host != "") && (user != "") && (id != "") && (pass != ""))
 615                 {
 616                         SQLConnection* ThisSQL = new SQLConnection(host,user,pass,db,id);
 617                         ServerInstance->Log(DEFAULT,"Loaded database: "+ThisSQL->GetHost());
 618                         Connections[id] = ThisSQL;
 619                         ServerInstance->Log(DEBUG,"Pushed back connection");
 620                 }
 621         }
 622         ConnectDatabases(ServerInstance);
 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         send(QueueFD, connection_with_new_result->GetID().c_str(), connection_with_new_result->GetID().length()+1, 0);
 637 }
 638
 639 void* DispatcherThread(void* arg);
 640
 641 /** Used by m_mysql to notify one thread when the other has a result
 642  */
 643 class Notifier : public InspSocket
 644 {
 645         insp_sockaddr sock_us;
 646         socklen_t uslen;
 647
 648
 649  public:
 650
 651         /* Create a socket on a random port. Let the tcp stack allocate us an available port */
 652 #ifdef IPV6
 653         Notifier(InspIRCd* SI) : InspSocket(SI, "::1", 0, true, 3000)
 654 #else
 655         Notifier(InspIRCd* SI) : InspSocket(SI, "127.0.0.1", 0, true, 3000)
 656 #endif
 657         {
 658                 uslen = sizeof(sock_us);
 659                 if (getsockname(this->fd,(sockaddr*)&sock_us,&uslen))
 660                 {
 661                         throw ModuleException("Could not create random listening port on localhost");
 662                 }
 663         }
 664
 665         Notifier(InspIRCd* SI, int newfd, char* ip) : InspSocket(SI, newfd, ip)
 666         {
 667                 Instance->Log(DEBUG,"Constructor of new socket");
 668         }
 669
 670         /* Using getsockname and ntohs, we can determine which port number we were allocated */
 671         int GetPort()
 672         {
 673 #ifdef IPV6
 674                 return ntohs(sock_us.sin6_port);
 675 #else
 676                 return ntohs(sock_us.sin_port);
 677 #endif
 678         }
 679
 680         virtual int OnIncomingConnection(int newsock, char* ip)
 681         {
 682                 Instance->Log(DEBUG,"Inbound connection on fd %d!",newsock);
 683                 Notifier* n = new Notifier(this->Instance, newsock, ip);
 684                 n = n; /* Stop bitching at me, GCC */
 685                 return true;
 686         }
 687
 688         virtual bool OnDataReady()
 689         {
 690                 Instance->Log(DEBUG,"Inbound data!");
 691                 char* data = this->Read();
 692                 ConnMap::iterator iter;
 693
 694                 if (data && *data)
 695                 {
 696                         Instance->Log(DEBUG,"Looking for connection %s",data);
 697                         /* We expect to be sent a null terminated string */
 698                         if((iter = Connections.find(data)) != Connections.end())
 699                         {
 700                                 Instance->Log(DEBUG,"Found it!");
 701
 702                                 /* Lock the mutex, send back the data */
 703                                 pthread_mutex_lock(&results_mutex);
 704                                 ResultQueue::iterator n = iter->second->rq.begin();
 705                                 (*n)->Send();
 706                                 iter->second->rq.pop_front();
 707                                 pthread_mutex_unlock(&results_mutex);
 708                                 return true;
 709                         }
 710                 }
 711
 712                 return false;
 713         }
 714 };
 715
 716 /** MySQL module
 717  */
 718 class ModuleSQL : public Module
 719 {
 720  public:
 721
 722         ConfigReader *Conf;
 723         InspIRCd* PublicServerInstance;
 724         pthread_t Dispatcher;
 725         int currid;
 726
 727         void Implements(char* List)
 728         {
 729                 List[I_OnRehash] = List[I_OnRequest] = 1;
 730         }
 731
 732         unsigned long NewID()
 733         {
 734                 if (currid+1 == 0)
 735                         currid++;
 736                 return ++currid;
 737         }
 738
 739         char* OnRequest(Request* request)
 740         {
 741                 if(strcmp(SQLREQID, request->GetId()) == 0)
 742                 {
 743                         SQLrequest* req = (SQLrequest*)request;
 744
 745                         /* XXX: Lock */
 746                         pthread_mutex_lock(&queue_mutex);
 747
 748                         ConnMap::iterator iter;
 749
 750                         char* returnval = NULL;
 751
 752                         ServerInstance->Log(DEBUG, "Got query: '%s' with %d replacement parameters on id '%s'", req->query.q.c_str(), req->query.p.size(), req->dbid.c_str());
 753
 754                         if((iter = Connections.find(req->dbid)) != Connections.end())
 755                         {
 756                                 req->id = NewID();
 757                                 iter->second->queue.push(*req);
 758                                 returnval = SQLSUCCESS;
 759                         }
 760                         else
 761                         {
 762                                 req->error.Id(BAD_DBID);
 763                         }
 764
 765                         pthread_mutex_unlock(&queue_mutex);
 766                         /* XXX: Unlock */
 767
 768                         return returnval;
 769                 }
 770
 771                 ServerInstance->Log(DEBUG, "Got unsupported API version string: %s", request->GetId());
 772
 773                 return NULL;
 774         }
 775
 776         ModuleSQL(InspIRCd* Me)
 777                 : Module::Module(Me)
 778         {
 779
 780                 Conf = new ConfigReader(ServerInstance);
 781                 PublicServerInstance = ServerInstance;
 782                 currid = 0;
 783                 SQLModule = this;
 784
 785                 MessagePipe = new Notifier(ServerInstance);
 786                 ServerInstance->Log(DEBUG,"Bound notifier to 127.0.0.1:%d",MessagePipe->GetPort());
 787
 788                 pthread_attr_t attribs;
 789                 pthread_attr_init(&attribs);
 790                 pthread_attr_setdetachstate(&attribs, PTHREAD_CREATE_DETACHED);
 791                 if (pthread_create(&this->Dispatcher, &attribs, DispatcherThread, (void *)this) != 0)
 792                 {
 793                         throw ModuleException("m_mysql: Failed to create dispatcher thread: " + std::string(strerror(errno)));
 794                 }
 795                 if (!ServerInstance->PublishFeature("SQL", this))
 796                 {
 797                         /* Tell worker thread to exit NOW */
 798                         giveup = true;
 799                         throw ModuleException("m_mysql: Unable to publish feature 'SQL'");
 800                 }
 801         }
 802
 803         virtual ~ModuleSQL()
 804         {
 805                 DELETE(Conf);
 806         }
 807
 808         virtual void OnRehash(const std::string &parameter)
 809         {
 810                 /* TODO: set rehash bool here, which makes the dispatcher thread rehash at next opportunity */
 811         }
 812
 813         virtual Version GetVersion()
 814         {
 815                 return Version(1,1,0,0,VF_VENDOR|VF_SERVICEPROVIDER,API_VERSION);
 816         }
 817
 818 };
 819
 820 void* DispatcherThread(void* arg)
 821 {
 822         ModuleSQL* thismodule = (ModuleSQL*)arg;
 823         LoadDatabases(thismodule->Conf, thismodule->PublicServerInstance);
 824
 825         /* Connect back to the Notifier */
 826
 827         if ((QueueFD = socket(AF_FAMILY, SOCK_STREAM, 0)) == -1)
 828         {
 829                 /* crap, we're out of sockets... */
 830                 return NULL;
 831         }
 832
 833         insp_sockaddr addr;
 834
 835 #ifdef IPV6
 836         insp_aton("::1", &addr.sin6_addr);
 837         addr.sin6_family = AF_FAMILY;
 838         addr.sin6_port = htons(MessagePipe->GetPort());
 839 #else
 840         insp_inaddr ia;
 841         insp_aton("127.0.0.1", &ia);
 842         addr.sin_family = AF_FAMILY;
 843         addr.sin_addr = ia;
 844         addr.sin_port = htons(MessagePipe->GetPort());
 845 #endif
 846
 847         if (connect(QueueFD, (sockaddr*)&addr,sizeof(addr)) == -1)
 848         {
 849                 /* wtf, we cant connect to it, but we just created it! */
 850                 return NULL;
 851         }
 852
 853         while (!giveup)
 854         {
 855                 SQLConnection* conn = NULL;
 856                 /* XXX: Lock here for safety */
 857                 pthread_mutex_lock(&queue_mutex);
 858                 for (ConnMap::iterator i = Connections.begin(); i != Connections.end(); i++)
 859                 {
 860                         if (i->second->queue.totalsize())
 861                         {
 862                                 conn = i->second;
 863                                 break;
 864                         }
 865                 }
 866                 pthread_mutex_unlock(&queue_mutex);
 867                 /* XXX: Unlock */
 868
 869                 /* Theres an item! */
 870                 if (conn)
 871                 {
 872                         conn->DoLeadingQuery();
 873
 874                         /* XXX: Lock */
 875                         pthread_mutex_lock(&queue_mutex);
 876                         conn->queue.pop();
 877                         pthread_mutex_unlock(&queue_mutex);
 878                         /* XXX: Unlock */
 879                 }
 880
 881                 usleep(50);
 882         }
 883
 884         return NULL;
 885 }
 886
 887
 888 // stuff down here is the module-factory stuff. For basic modules you can ignore this.
 889
 890 class ModuleSQLFactory : public ModuleFactory
 891 {
 892  public:
 893         ModuleSQLFactory()
 894         {
 895         }
 896
 897         ~ModuleSQLFactory()
 898         {
 899         }
 900
 901         virtual Module * CreateModule(InspIRCd* Me)
 902         {
 903                 return new ModuleSQL(Me);
 904         }
 905
 906 };
 907
 908
 909 extern "C" void * init_module( void )
 910 {
 911         return new ModuleSQLFactory;
 912 }