src/modules/extra/m_mysql.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 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 #include <stdio.h>
  15 #include <string>
  16 #include <mysql.h>
  17 #include <pthread.h>
  18 #include "users.h"
  19 #include "channels.h"
  20 #include "modules.h"
  21 #include "inspircd.h"
  22 #include "m_sqlv2.h"
  23
  24 /* VERSION 2 API: With nonblocking (threaded) requests */
  25
  26 /* $ModDesc: SQL Service Provider module for all other m_sql* modules */
  27 /* $CompileFlags: `mysql_config --include` */
  28 /* $LinkerFlags: `mysql_config --libs_r` `perl extra/mysql_rpath.pl` */
  29 /* $ModDep: m_sqlv2.h */
  30
  31 /* THE NONBLOCKING MYSQL API!
  32  *
  33  * MySQL provides no nonblocking (asyncronous) API of its own, and its developers recommend
  34  * that instead, you should thread your program. This is what i've done here to allow for
  35  * asyncronous SQL requests via mysql. The way this works is as follows:
  36  *
  37  * The module spawns a thread via pthreads, and performs its mysql queries in this thread,
  38  * using a queue with priorities. There is a mutex on either end which prevents two threads
  39  * adjusting the queue at the same time, and crashing the ircd. Every 50 milliseconds, the
  40  * worker thread wakes up, and checks if there is a request at the head of its queue.
  41  * If there is, it processes this request, blocking the worker thread but leaving the ircd
  42  * thread to go about its business as usual. During this period, the ircd thread is able
  43  * to insert futher pending requests into the queue.
  44  *
  45  * Once the processing of a request is complete, it is removed from the incoming queue to
  46  * an outgoing queue, and initialized as a 'response'. The worker thread then signals the
  47  * ircd thread (via a loopback socket) of the fact a result is available, by sending the
  48  * connection ID through the connection.
  49  *
  50  * The ircd thread then mutexes the queue once more, reads the outbound response off the head
  51  * of the queue, and sends it on its way to the original calling module.
  52  *
  53  * XXX: You might be asking "why doesnt he just send the response from within the worker thread?"
  54  * The answer to this is simple. The majority of InspIRCd, and in fact most ircd's are not
  55  * threadsafe. This module is designed to be threadsafe and is careful with its use of threads,
  56  * however, if we were to call a module's OnRequest even from within a thread which was not the
  57  * one the module was originally instantiated upon, there is a chance of all hell breaking loose
  58  * if a module is ever put in a re-enterant state (stack corruption could occur, crashes, data
  59  * corruption, and worse, so DONT think about it until the day comes when InspIRCd is 100%
  60  * gauranteed threadsafe!)
  61  *
  62  * For a diagram of this system please see http://www.inspircd.org/wiki/Mysql2
  63  */
  64
  65
  66 class SQLConnection;
  67 class Notifier;
  68
  69
  70 typedef std::map<std::string, SQLConnection*> ConnMap;
  71 bool giveup = false;
  72 static Module* SQLModule = NULL;
  73 static Notifier* MessagePipe = NULL;
  74 int QueueFD = -1;
  75
  76
  77 #if !defined(MYSQL_VERSION_ID) || MYSQL_VERSION_ID<32224
  78 #define mysql_field_count mysql_num_fields
  79 #endif
  80
  81 typedef std::deque<SQLresult*> ResultQueue;
  82
  83 /** Represents a mysql query queue
  84  */
  85 class QueryQueue : public classbase
  86 {
  87 private:
  88         typedef std::deque<SQLrequest> ReqDeque;
  89
  90         ReqDeque priority;      /* The priority queue */
  91         ReqDeque normal;        /* The 'normal' queue */
  92         enum { PRI, NOR, NON } which;   /* Which queue the currently active element is at the front of */
  93
  94 public:
  95         QueryQueue()
  96         : which(NON)
  97         {
  98         }
  99
 100         void push(const SQLrequest &q)
 101         {
 102                 if(q.pri)
 103                         priority.push_back(q);
 104                 else
 105                         normal.push_back(q);
 106         }
 107
 108         void pop()
 109         {
 110                 if((which == PRI) && priority.size())
 111                 {
 112                         priority.pop_front();
 113                 }
 114                 else if((which == NOR) && normal.size())
 115                 {
 116                         normal.pop_front();
 117                 }
 118
 119                 /* Reset this */
 120                 which = NON;
 121
 122                 /* Silently do nothing if there was no element to pop() */
 123         }
 124
 125         SQLrequest& front()
 126         {
 127                 switch(which)
 128                 {
 129                         case PRI:
 130                                 return priority.front();
 131                         case NOR:
 132                                 return normal.front();
 133                         default:
 134                                 if(priority.size())
 135                                 {
 136                                         which = PRI;
 137                                         return priority.front();
 138                                 }
 139
 140                                 if(normal.size())
 141                                 {
 142                                         which = NOR;
 143                                         return normal.front();
 144                                 }
 145
 146                                 /* This will probably result in a segfault,
 147                                  * but the caller should have checked totalsize()
 148                                  * first so..meh - moron :p
 149                                  */
 150
 151                                 return priority.front();
 152                 }
 153         }
 154
 155         std::pair<int, int> size()
 156         {
 157                 return std::make_pair(priority.size(), normal.size());
 158         }
 159
 160         int totalsize()
 161         {
 162                 return priority.size() + normal.size();
 163         }
 164
 165         void PurgeModule(Module* mod)
 166         {
 167                 DoPurgeModule(mod, priority);
 168                 DoPurgeModule(mod, normal);
 169         }
 170
 171 private:
 172         void DoPurgeModule(Module* mod, ReqDeque& q)
 173         {
 174                 for(ReqDeque::iterator iter = q.begin(); iter != q.end(); iter++)
 175                 {
 176                         if(iter->GetSource() == mod)
 177                         {
 178                                 if(iter->id == front().id)
 179                                 {
 180                                         /* It's the currently active query.. :x */
 181                                         iter->SetSource(NULL);
 182                                 }
 183                                 else
 184                                 {
 185                                         /* It hasn't been executed yet..just remove it */
 186                                         iter = q.erase(iter);
 187                                 }
 188                         }
 189                 }
 190         }
 191 };
 192
 193 /* A mutex to wrap around queue accesses */
 194 pthread_mutex_t queue_mutex = PTHREAD_MUTEX_INITIALIZER;
 195
 196 pthread_mutex_t results_mutex = PTHREAD_MUTEX_INITIALIZER;
 197
 198 pthread_mutex_t logging_mutex = PTHREAD_MUTEX_INITIALIZER;
 199
 200 /** Represents a mysql result set
 201  */
 202 class MySQLresult : public SQLresult
 203 {
 204         int currentrow;
 205         //std::vector<std::map<std::string,std::string> > results;
 206         std::vector<std::string> colnames;
 207         std::vector<SQLfieldList> fieldlists;
 208         SQLfieldMap* fieldmap;
 209         SQLfieldMap fieldmap2;
 210         SQLfieldList emptyfieldlist;
 211         int rows;
 212  public:
 213
 214         MySQLresult(Module* self, Module* to, MYSQL_RES* res, int affected_rows, unsigned int id) : SQLresult(self, to, id), currentrow(0), fieldmap(NULL)
 215         {
 216                 /* A number of affected rows from from mysql_affected_rows.
 217                  */
 218                 fieldlists.clear();
 219                 rows = 0;
 220                 if (affected_rows >= 1)
 221                 {
 222                         rows = affected_rows;
 223                         fieldlists.resize(rows);
 224                 }
 225                 unsigned int field_count = 0;
 226                 if (res)
 227                 {
 228                         MYSQL_ROW row;
 229                         int n = 0;
 230                         while ((row = mysql_fetch_row(res)))
 231                         {
 232                                 if (fieldlists.size() < (unsigned int)rows+1)
 233                                 {
 234                                         fieldlists.resize(fieldlists.size()+1);
 235                                 }
 236                                 field_count = 0;
 237                                 MYSQL_FIELD *fields = mysql_fetch_fields(res);
 238                                 if(mysql_num_fields(res) == 0)
 239                                         break;
 240                                 if (fields && mysql_num_fields(res))
 241                                 {
 242                                         colnames.clear();
 243                                         while (field_count < mysql_num_fields(res))
 244                                         {
 245                                                 std::string a = (fields[field_count].name ? fields[field_count].name : "");
 246                                                 std::string b = (row[field_count] ? row[field_count] : "");
 247                                                 SQLfield sqlf(b, !row[field_count]);
 248                                                 colnames.push_back(a);
 249                                                 fieldlists[n].push_back(sqlf);
 250                                                 field_count++;
 251                                         }
 252                                         n++;
 253                                 }
 254                                 rows++;
 255                         }
 256                         mysql_free_result(res);
 257                 }
 258         }
 259
 260         MySQLresult(Module* self, Module* to, SQLerror e, unsigned int id) : SQLresult(self, to, id), currentrow(0)
 261         {
 262                 rows = 0;
 263                 error = e;
 264         }
 265
 266         ~MySQLresult()
 267         {
 268         }
 269
 270         virtual int Rows()
 271         {
 272                 return rows;
 273         }
 274
 275         virtual int Cols()
 276         {
 277                 return colnames.size();
 278         }
 279
 280         virtual std::string ColName(int column)
 281         {
 282                 if (column < (int)colnames.size())
 283                 {
 284                         return colnames[column];
 285                 }
 286                 else
 287                 {
 288                         throw SQLbadColName();
 289                 }
 290                 return "";
 291         }
 292
 293         virtual int ColNum(const std::string &column)
 294         {
 295                 for (unsigned int i = 0; i < colnames.size(); i++)
 296                 {
 297                         if (column == colnames[i])
 298                                 return i;
 299                 }
 300                 throw SQLbadColName();
 301                 return 0;
 302         }
 303
 304         virtual SQLfield GetValue(int row, int column)
 305         {
 306                 if ((row >= 0) && (row < rows) && (column >= 0) && (column < Cols()))
 307                 {
 308                         return fieldlists[row][column];
 309                 }
 310
 311                 throw SQLbadColName();
 312
 313                 /* XXX: We never actually get here because of the throw */
 314                 return SQLfield("",true);
 315         }
 316
 317         virtual SQLfieldList& GetRow()
 318         {
 319                 if (currentrow < rows)
 320                         return fieldlists[currentrow];
 321                 else
 322                         return emptyfieldlist;
 323         }
 324
 325         virtual SQLfieldMap& GetRowMap()
 326         {
 327                 fieldmap2.clear();
 328
 329                 if (currentrow < rows)
 330                 {
 331                         for (int i = 0; i < Cols(); i++)
 332                         {
 333                                 fieldmap2.insert(std::make_pair(colnames[i],GetValue(currentrow, i)));
 334                         }
 335                         currentrow++;
 336                 }
 337
 338                 return fieldmap2;
 339         }
 340
 341         virtual SQLfieldList* GetRowPtr()
 342         {
 343                 SQLfieldList* fieldlist = new SQLfieldList();
 344
 345                 if (currentrow < rows)
 346                 {
 347                         for (int i = 0; i < Rows(); i++)
 348                         {
 349                                 fieldlist->push_back(fieldlists[currentrow][i]);
 350                         }
 351                         currentrow++;
 352                 }
 353                 return fieldlist;
 354         }
 355
 356         virtual SQLfieldMap* GetRowMapPtr()
 357         {
 358                 fieldmap = new SQLfieldMap();
 359
 360                 if (currentrow < rows)
 361                 {
 362                         for (int i = 0; i < Cols(); i++)
 363                         {
 364                                 fieldmap->insert(std::make_pair(colnames[i],GetValue(currentrow, i)));
 365                         }
 366                         currentrow++;
 367                 }
 368
 369                 return fieldmap;
 370         }
 371
 372         virtual void Free(SQLfieldMap* fm)
 373         {
 374                 delete fm;
 375         }
 376
 377         virtual void Free(SQLfieldList* fl)
 378         {
 379                 delete fl;
 380         }
 381 };
 382
 383 class SQLConnection;
 384
 385 void NotifyMainThread(SQLConnection* connection_with_new_result);
 386
 387 /** Represents a connection to a mysql database
 388  */
 389 class SQLConnection : public classbase
 390 {
 391  protected:
 392
 393         MYSQL connection;
 394         MYSQL_RES *res;
 395         MYSQL_ROW row;
 396         std::string host;
 397         std::string user;
 398         std::string pass;
 399         std::string db;
 400         std::map<std::string,std::string> thisrow;
 401         bool Enabled;
 402         std::string id;
 403
 404  public:
 405
 406         QueryQueue queue;
 407         ResultQueue rq;
 408
 409         // This constructor creates an SQLConnection object with the given credentials, but does not connect yet.
 410         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)
 411         {
 412         }
 413
 414         // This method connects to the database using the credentials supplied to the constructor, and returns
 415         // true upon success.
 416         bool Connect()
 417         {
 418                 unsigned int timeout = 1;
 419                 mysql_init(&connection);
 420                 mysql_options(&connection,MYSQL_OPT_CONNECT_TIMEOUT,(char*)&timeout);
 421                 return mysql_real_connect(&connection, host.c_str(), user.c_str(), pass.c_str(), db.c_str(), 0, NULL, 0);
 422         }
 423
 424         void DoLeadingQuery()
 425         {
 426                 if (!CheckConnection())
 427                         return;
 428
 429                 /* Parse the command string and dispatch it to mysql */
 430                 SQLrequest& req = queue.front();
 431
 432                 /* Pointer to the buffer we screw around with substitution in */
 433                 char* query;
 434
 435                 /* Pointer to the current end of query, where we append new stuff */
 436                 char* queryend;
 437
 438                 /* Total length of the unescaped parameters */
 439                 unsigned long paramlen;
 440
 441                 /* Total length of query, used for binary-safety in mysql_real_query */
 442                 unsigned long querylength = 0;
 443
 444                 paramlen = 0;
 445
 446                 for(ParamL::iterator i = req.query.p.begin(); i != req.query.p.end(); i++)
 447                 {
 448                         paramlen += i->size();
 449                 }
 450
 451                 /* To avoid a lot of allocations, allocate enough memory for the biggest the escaped query could possibly be.
 452                  * sizeofquery + (totalparamlength*2) + 1
 453                  *
 454                  * The +1 is for null-terminating the string for mysql_real_escape_string
 455                  */
 456
 457                 query = new char[req.query.q.length() + (paramlen*2)];
 458                 queryend = query;
 459
 460                 /* Okay, now we have a buffer large enough we need to start copying the query into it and escaping and substituting
 461                  * the parameters into it...
 462                  */
 463
 464                 for(unsigned long i = 0; i < req.query.q.length(); i++)
 465                 {
 466                         if(req.query.q[i] == '?')
 467                         {
 468                                 /* We found a place to substitute..what fun.
 469                                  * use mysql calls to escape and write the
 470                                  * escaped string onto the end of our query buffer,
 471                                  * then we "just" need to make sure queryend is
 472                                  * pointing at the right place.
 473                                  */
 474                                 if(req.query.p.size())
 475                                 {
 476                                         unsigned long len = mysql_real_escape_string(&connection, queryend, req.query.p.front().c_str(), req.query.p.front().length());
 477
 478                                         queryend += len;
 479                                         req.query.p.pop_front();
 480                                 }
 481                                 else
 482                                         break;
 483                         }
 484                         else
 485                         {
 486                                 *queryend = req.query.q[i];
 487                                 queryend++;
 488                         }
 489                         querylength++;
 490                 }
 491
 492                 *queryend = 0;
 493
 494                 pthread_mutex_lock(&queue_mutex);
 495                 req.query.q = query;
 496                 pthread_mutex_unlock(&queue_mutex);
 497
 498                 if (!mysql_real_query(&connection, req.query.q.data(), req.query.q.length()))
 499                 {
 500                         /* Successfull query */
 501                         res = mysql_use_result(&connection);
 502                         unsigned long rows = mysql_affected_rows(&connection);
 503                         MySQLresult* r = new MySQLresult(SQLModule, req.GetSource(), res, rows, req.id);
 504                         r->dbid = this->GetID();
 505                         r->query = req.query.q;
 506                         /* Put this new result onto the results queue.
 507                          * XXX: Remember to mutex the queue!
 508                          */
 509                         pthread_mutex_lock(&results_mutex);
 510                         rq.push_back(r);
 511                         pthread_mutex_unlock(&results_mutex);
 512                 }
 513                 else
 514                 {
 515                         /* XXX: See /usr/include/mysql/mysqld_error.h for a list of
 516                          * possible error numbers and error messages */
 517                         SQLerror e(QREPLY_FAIL, ConvToStr(mysql_errno(&connection)) + std::string(": ") + mysql_error(&connection));
 518                         MySQLresult* r = new MySQLresult(SQLModule, req.GetSource(), e, req.id);
 519                         r->dbid = this->GetID();
 520                         r->query = req.query.q;
 521
 522                         pthread_mutex_lock(&results_mutex);
 523                         rq.push_back(r);
 524                         pthread_mutex_unlock(&results_mutex);
 525                 }
 526
 527                 /* Now signal the main thread that we've got a result to process.
 528                  * Pass them this connection id as what to examine
 529                  */
 530
 531                 delete[] query;
 532
 533                 NotifyMainThread(this);
 534         }
 535
 536         bool ConnectionLost()
 537         {
 538                 if (&connection) {
 539                         return (mysql_ping(&connection) != 0);
 540                 }
 541                 else return false;
 542         }
 543
 544         bool CheckConnection()
 545         {
 546                 if (ConnectionLost()) {
 547                         return Connect();
 548                 }
 549                 else return true;
 550         }
 551
 552         std::string GetError()
 553         {
 554                 return mysql_error(&connection);
 555         }
 556
 557         const std::string& GetID()
 558         {
 559                 return id;
 560         }
 561
 562         std::string GetHost()
 563         {
 564                 return host;
 565         }
 566
 567         void SetEnable(bool Enable)
 568         {
 569                 Enabled = Enable;
 570         }
 571
 572         bool IsEnabled()
 573         {
 574                 return Enabled;
 575         }
 576
 577 };
 578
 579 ConnMap Connections;
 580
 581 void ConnectDatabases(InspIRCd* ServerInstance)
 582 {
 583         for (ConnMap::iterator i = Connections.begin(); i != Connections.end(); i++)
 584         {
 585                 i->second->SetEnable(true);
 586                 if (!i->second->Connect())
 587                 {
 588                         /* XXX: MUTEX */
 589                         pthread_mutex_lock(&logging_mutex);
 590                         ServerInstance->Log(DEFAULT,"SQL: Failed to connect database "+i->second->GetHost()+": Error: "+i->second->GetError());
 591                         i->second->SetEnable(false);
 592                         pthread_mutex_unlock(&logging_mutex);
 593                 }
 594         }
 595 }
 596
 597 void ClearDatabases()
 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 LoadDatabases(ConfigReader* ThisConf, InspIRCd* ServerInstance)
 608 {
 609         ClearDatabases();
 610         for (int j =0; j < ThisConf->Enumerate("database"); j++)
 611         {
 612                 std::string db = ThisConf->ReadValue("database","name",j);
 613                 std::string user = ThisConf->ReadValue("database","username",j);
 614                 std::string pass = ThisConf->ReadValue("database","password",j);
 615                 std::string host = ThisConf->ReadValue("database","hostname",j);
 616                 std::string id = ThisConf->ReadValue("database","id",j);
 617                 if ((db != "") && (host != "") && (user != "") && (id != "") && (pass != ""))
 618                 {
 619                         SQLConnection* ThisSQL = new SQLConnection(host,user,pass,db,id);
 620                         Connections[id] = ThisSQL;
 621                 }
 622         }
 623         ConnectDatabases(ServerInstance);
 624 }
 625
 626 void NotifyMainThread(SQLConnection* connection_with_new_result)
 627 {
 628         /* Here we write() to the socket the main thread has open
 629          * and we connect()ed back to before our thread became active.
 630          * The main thread is using a nonblocking socket tied into
 631          * the socket engine, so they wont block and they'll receive
 632          * nearly instant notification. Because we're in a seperate
 633          * thread, we can just use standard connect(), and we can
 634          * block if we like. We just send the connection id of the
 635          * connection back.
 636          */
 637         send(QueueFD, connection_with_new_result->GetID().c_str(), connection_with_new_result->GetID().length()+1, 0);
 638 }
 639
 640 void* DispatcherThread(void* arg);
 641
 642 /** Used by m_mysql to notify one thread when the other has a result
 643  */
 644 class Notifier : public InspSocket
 645 {
 646         insp_sockaddr sock_us;
 647         socklen_t uslen;
 648
 649
 650  public:
 651
 652         /* Create a socket on a random port. Let the tcp stack allocate us an available port */
 653 #ifdef IPV6
 654         Notifier(InspIRCd* SI) : InspSocket(SI, "::1", 0, true, 3000)
 655 #else
 656         Notifier(InspIRCd* SI) : InspSocket(SI, "127.0.0.1", 0, true, 3000)
 657 #endif
 658         {
 659                 uslen = sizeof(sock_us);
 660                 if (getsockname(this->fd,(sockaddr*)&sock_us,&uslen))
 661                 {
 662                         throw ModuleException("Could not create random listening port on localhost");
 663                 }
 664         }
 665
 666         Notifier(InspIRCd* SI, int newfd, char* ip) : InspSocket(SI, newfd, ip)
 667         {
 668                 Instance->Log(DEBUG,"Constructor of new socket");
 669         }
 670
 671         /* Using getsockname and ntohs, we can determine which port number we were allocated */
 672         int GetPort()
 673         {
 674 #ifdef IPV6
 675                 return ntohs(sock_us.sin6_port);
 676 #else
 677                 return ntohs(sock_us.sin_port);
 678 #endif
 679         }
 680
 681         virtual int OnIncomingConnection(int newsock, char* ip)
 682         {
 683                 Instance->Log(DEBUG,"Inbound connection on fd %d!",newsock);
 684                 Notifier* n = new Notifier(this->Instance, newsock, ip);
 685                 n = n; /* Stop bitching at me, GCC */
 686                 return true;
 687         }
 688
 689         virtual bool OnDataReady()
 690         {
 691                 Instance->Log(DEBUG,"Inbound data!");
 692                 char* data = this->Read();
 693                 ConnMap::iterator iter;
 694
 695                 if (data && *data)
 696                 {
 697                         Instance->Log(DEBUG,"Looking for connection %s",data);
 698                         /* We expect to be sent a null terminated string */
 699                         if((iter = Connections.find(data)) != Connections.end())
 700                         {
 701                                 Instance->Log(DEBUG,"Found it!");
 702
 703                                 /* Lock the mutex, send back the data */
 704                                 pthread_mutex_lock(&results_mutex);
 705                                 ResultQueue::iterator n = iter->second->rq.begin();
 706                                 (*n)->Send();
 707                                 iter->second->rq.pop_front();
 708                                 pthread_mutex_unlock(&results_mutex);
 709                                 return true;
 710                         }
 711                 }
 712
 713                 return false;
 714         }
 715 };
 716
 717 /** MySQL module
 718  */
 719 class ModuleSQL : public Module
 720 {
 721  public:
 722
 723         ConfigReader *Conf;
 724         InspIRCd* PublicServerInstance;
 725         pthread_t Dispatcher;
 726         int currid;
 727
 728         void Implements(char* List)
 729         {
 730                 List[I_OnRehash] = List[I_OnRequest] = 1;
 731         }
 732
 733         unsigned long NewID()
 734         {
 735                 if (currid+1 == 0)
 736                         currid++;
 737                 return ++currid;
 738         }
 739
 740         char* OnRequest(Request* request)
 741         {
 742                 if(strcmp(SQLREQID, request->GetId()) == 0)
 743                 {
 744                         SQLrequest* req = (SQLrequest*)request;
 745
 746                         /* XXX: Lock */
 747                         pthread_mutex_lock(&queue_mutex);
 748
 749                         ConnMap::iterator iter;
 750
 751                         char* returnval = NULL;
 752
 753                         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());
 754
 755                         if((iter = Connections.find(req->dbid)) != Connections.end())
 756                         {
 757                                 req->id = NewID();
 758                                 iter->second->queue.push(*req);
 759                                 returnval = SQLSUCCESS;
 760                         }
 761                         else
 762                         {
 763                                 req->error.Id(BAD_DBID);
 764                         }
 765
 766                         pthread_mutex_unlock(&queue_mutex);
 767                         /* XXX: Unlock */
 768
 769                         return returnval;
 770                 }
 771
 772                 ServerInstance->Log(DEBUG, "Got unsupported API version string: %s", request->GetId());
 773
 774                 return NULL;
 775         }
 776
 777         ModuleSQL(InspIRCd* Me)
 778                 : Module::Module(Me)
 779         {
 780
 781                 Conf = new ConfigReader(ServerInstance);
 782                 PublicServerInstance = ServerInstance;
 783                 currid = 0;
 784                 SQLModule = this;
 785
 786                 MessagePipe = new Notifier(ServerInstance);
 787                 ServerInstance->Log(DEBUG,"Bound notifier to 127.0.0.1:%d",MessagePipe->GetPort());
 788
 789                 pthread_attr_t attribs;
 790                 pthread_attr_init(&attribs);
 791                 pthread_attr_setdetachstate(&attribs, PTHREAD_CREATE_DETACHED);
 792                 if (pthread_create(&this->Dispatcher, &attribs, DispatcherThread, (void *)this) != 0)
 793                 {
 794                         throw ModuleException("m_mysql: Failed to create dispatcher thread: " + std::string(strerror(errno)));
 795                 }
 796                 if (!ServerInstance->PublishFeature("SQL", this))
 797                 {
 798                         /* Tell worker thread to exit NOW */
 799                         giveup = true;
 800                         throw ModuleException("m_mysql: Unable to publish feature 'SQL'");
 801                 }
 802         }
 803
 804         virtual ~ModuleSQL()
 805         {
 806                 giveup = true;
 807                 ClearDatabases();
 808                 DELETE(Conf);
 809         }
 810
 811         virtual void OnRehash(const std::string &parameter)
 812         {
 813                 /* TODO: set rehash bool here, which makes the dispatcher thread rehash at next opportunity */
 814         }
 815
 816         virtual Version GetVersion()
 817         {
 818                 return Version(1,1,0,0,VF_VENDOR|VF_SERVICEPROVIDER,API_VERSION);
 819         }
 820
 821 };
 822
 823 void* DispatcherThread(void* arg)
 824 {
 825         ModuleSQL* thismodule = (ModuleSQL*)arg;
 826         LoadDatabases(thismodule->Conf, thismodule->PublicServerInstance);
 827
 828         /* Connect back to the Notifier */
 829
 830         if ((QueueFD = socket(AF_FAMILY, SOCK_STREAM, 0)) == -1)
 831         {
 832                 /* crap, we're out of sockets... */
 833                 return NULL;
 834         }
 835
 836         insp_sockaddr addr;
 837
 838 #ifdef IPV6
 839         insp_aton("::1", &addr.sin6_addr);
 840         addr.sin6_family = AF_FAMILY;
 841         addr.sin6_port = htons(MessagePipe->GetPort());
 842 #else
 843         insp_inaddr ia;
 844         insp_aton("127.0.0.1", &ia);
 845         addr.sin_family = AF_FAMILY;
 846         addr.sin_addr = ia;
 847         addr.sin_port = htons(MessagePipe->GetPort());
 848 #endif
 849
 850         if (connect(QueueFD, (sockaddr*)&addr,sizeof(addr)) == -1)
 851         {
 852                 /* wtf, we cant connect to it, but we just created it! */
 853                 return NULL;
 854         }
 855
 856         while (!giveup)
 857         {
 858                 SQLConnection* conn = NULL;
 859                 /* XXX: Lock here for safety */
 860                 pthread_mutex_lock(&queue_mutex);
 861                 for (ConnMap::iterator i = Connections.begin(); i != Connections.end(); i++)
 862                 {
 863                         if (i->second->queue.totalsize())
 864                         {
 865                                 conn = i->second;
 866                                 break;
 867                         }
 868                 }
 869                 pthread_mutex_unlock(&queue_mutex);
 870                 /* XXX: Unlock */
 871
 872                 /* Theres an item! */
 873                 if (conn)
 874                 {
 875                         conn->DoLeadingQuery();
 876
 877                         /* XXX: Lock */
 878                         pthread_mutex_lock(&queue_mutex);
 879                         conn->queue.pop();
 880                         pthread_mutex_unlock(&queue_mutex);
 881                         /* XXX: Unlock */
 882                 }
 883
 884                 usleep(50);
 885         }
 886
 887         return NULL;
 888 }
 889
 890
 891 // stuff down here is the module-factory stuff. For basic modules you can ignore this.
 892
 893 class ModuleSQLFactory : public ModuleFactory
 894 {
 895  public:
 896         ModuleSQLFactory()
 897         {
 898         }
 899
 900         ~ModuleSQLFactory()
 901         {
 902         }
 903
 904         virtual Module * CreateModule(InspIRCd* Me)
 905         {
 906                 return new ModuleSQL(Me);
 907         }
 908
 909 };
 910
 911
 912 extern "C" void * init_module( void )
 913 {
 914         return new ModuleSQLFactory;
 915 }