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 /* $ModDep: m_sqlv2.h */
  35
  36 /* THE NONBLOCKING MYSQL API!
  37  *
  38  * MySQL provides no nonblocking (asyncronous) API of its own, and its developers recommend
  39  * that instead, you should thread your program. This is what i've done here to allow for
  40  * asyncronous SQL requests via mysql. The way this works is as follows:
  41  *
  42  * The module spawns a thread via pthreads, and performs its mysql queries in this thread,
  43  * using a queue with priorities. There is a mutex on either end which prevents two threads
  44  * adjusting the queue at the same time, and crashing the ircd. Every 50 milliseconds, the
  45  * worker thread wakes up, and checks if there is a request at the head of its queue.
  46  * If there is, it processes this request, blocking the worker thread but leaving the ircd
  47  * thread to go about its business as usual. During this period, the ircd thread is able
  48  * to insert futher pending requests into the queue.
  49  *
  50  * Once the processing of a request is complete, it is removed from the incoming queue to
  51  * an outgoing queue, and initialized as a 'response'. The worker thread then signals the
  52  * ircd thread (via a loopback socket) of the fact a result is available, by sending the
  53  * connection ID through the connection.
  54  *
  55  * The ircd thread then mutexes the queue once more, reads the outbound response off the head
  56  * of the queue, and sends it on its way to the original calling module.
  57  *
  58  * XXX: You might be asking "why doesnt he just send the response from within the worker thread?"
  59  * The answer to this is simple. The majority of InspIRCd, and in fact most ircd's are not
  60  * threadsafe. This module is designed to be threadsafe and is careful with its use of threads,
  61  * however, if we were to call a module's OnRequest even from within a thread which was not the
  62  * one the module was originally instantiated upon, there is a chance of all hell breaking loose
  63  * if a module is ever put in a re-enterant state (stack corruption could occur, crashes, data
  64  * corruption, and worse, so DONT think about it until the day comes when InspIRCd is 100%
  65  * gauranteed threadsafe!)
  66  *
  67  * For a diagram of this system please see http://www.inspircd.org/wiki/Mysql2
  68  */
  69
  70
  71 class SQLConnection;
  72 class Notifier;
  73
  74
  75 typedef std::map<std::string, SQLConnection*> ConnMap;
  76 bool giveup = false;
  77 static Module* SQLModule = NULL;
  78 static Notifier* MessagePipe = NULL;
  79 int QueueFD = -1;
  80
  81
  82 #if !defined(MYSQL_VERSION_ID) || MYSQL_VERSION_ID<32224
  83 #define mysql_field_count mysql_num_fields
  84 #endif
  85
  86 typedef std::deque<SQLresult*> ResultQueue;
  87
  88 /** Represents a mysql query queue
  89  */
  90 class QueryQueue : public classbase
  91 {
  92 private:
  93         typedef std::deque<SQLrequest> ReqDeque;
  94
  95         ReqDeque priority;      /* The priority queue */
  96         ReqDeque normal;        /* The 'normal' queue */
  97         enum { PRI, NOR, NON } which;   /* Which queue the currently active element is at the front of */
  98
  99 public:
 100         QueryQueue()
 101         : which(NON)
 102         {
 103         }
 104
 105         void push(const SQLrequest &q)
 106         {
 107                 if(q.pri)
 108                         priority.push_back(q);
 109                 else
 110                         normal.push_back(q);
 111         }
 112
 113         void pop()
 114         {
 115                 if((which == PRI) && priority.size())
 116                 {
 117                         priority.pop_front();
 118                 }
 119                 else if((which == NOR) && normal.size())
 120                 {
 121                         normal.pop_front();
 122                 }
 123
 124                 /* Reset this */
 125                 which = NON;
 126
 127                 /* Silently do nothing if there was no element to pop() */
 128         }
 129
 130         SQLrequest& front()
 131         {
 132                 switch(which)
 133                 {
 134                         case PRI:
 135                                 return priority.front();
 136                         case NOR:
 137                                 return normal.front();
 138                         default:
 139                                 if(priority.size())
 140                                 {
 141                                         which = PRI;
 142                                         return priority.front();
 143                                 }
 144
 145                                 if(normal.size())
 146                                 {
 147                                         which = NOR;
 148                                         return normal.front();
 149                                 }
 150
 151                                 /* This will probably result in a segfault,
 152                                  * but the caller should have checked totalsize()
 153                                  * first so..meh - moron :p
 154                                  */
 155
 156                                 return priority.front();
 157                 }
 158         }
 159
 160         std::pair<int, int> size()
 161         {
 162                 return std::make_pair(priority.size(), normal.size());
 163         }
 164
 165         int totalsize()
 166         {
 167                 return priority.size() + normal.size();
 168         }
 169
 170         void PurgeModule(Module* mod)
 171         {
 172                 DoPurgeModule(mod, priority);
 173                 DoPurgeModule(mod, normal);
 174         }
 175
 176 private:
 177         void DoPurgeModule(Module* mod, ReqDeque& q)
 178         {
 179                 for(ReqDeque::iterator iter = q.begin(); iter != q.end(); iter++)
 180                 {
 181                         if(iter->GetSource() == mod)
 182                         {
 183                                 if(iter->id == front().id)
 184                                 {
 185                                         /* It's the currently active query.. :x */
 186                                         iter->SetSource(NULL);
 187                                 }
 188                                 else
 189                                 {
 190                                         /* It hasn't been executed yet..just remove it */
 191                                         iter = q.erase(iter);
 192                                 }
 193                         }
 194                 }
 195         }
 196 };
 197
 198 /* A mutex to wrap around queue accesses */
 199 pthread_mutex_t queue_mutex = PTHREAD_MUTEX_INITIALIZER;
 200
 201 pthread_mutex_t results_mutex = PTHREAD_MUTEX_INITIALIZER;
 202
 203 /** Represents a mysql result set
 204  */
 205 class MySQLresult : public SQLresult
 206 {
 207         int currentrow;
 208         //std::vector<std::map<std::string,std::string> > results;
 209         std::vector<std::string> colnames;
 210         std::vector<SQLfieldList> fieldlists;
 211         SQLfieldMap* fieldmap;
 212         SQLfieldMap fieldmap2;
 213         SQLfieldList emptyfieldlist;
 214         int rows;
 215  public:
 216
 217         MySQLresult(Module* self, Module* to, MYSQL_RES* res, int affected_rows, unsigned int id) : SQLresult(self, to, id), currentrow(0), fieldmap(NULL)
 218         {
 219                 /* A number of affected rows from from mysql_affected_rows.
 220                  */
 221                 fieldlists.clear();
 222                 rows = 0;
 223                 if (affected_rows >= 1)
 224                 {
 225                         rows = affected_rows;
 226                         fieldlists.resize(rows);
 227                 }
 228                 unsigned int field_count = 0;
 229                 if (res)
 230                 {
 231                         MYSQL_ROW row;
 232                         int n = 0;
 233                         while ((row = mysql_fetch_row(res)))
 234                         {
 235                                 if (fieldlists.size() < (unsigned int)rows+1)
 236                                 {
 237                                         fieldlists.resize(fieldlists.size()+1);
 238                                 }
 239                                 field_count = 0;
 240                                 MYSQL_FIELD *fields = mysql_fetch_fields(res);
 241                                 if(mysql_num_fields(res) == 0)
 242                                         break;
 243                                 if (fields && mysql_num_fields(res))
 244                                 {
 245                                         colnames.clear();
 246                                         while (field_count < mysql_num_fields(res))
 247                                         {
 248                                                 std::string a = (fields[field_count].name ? fields[field_count].name : "");
 249                                                 std::string b = (row[field_count] ? row[field_count] : "");
 250                                                 SQLfield sqlf(b, !row[field_count]);
 251                                                 colnames.push_back(a);
 252                                                 fieldlists[n].push_back(sqlf);
 253                                                 field_count++;
 254                                         }
 255                                         n++;
 256                                 }
 257                                 rows++;
 258                         }
 259                         mysql_free_result(res);
 260                 }
 261         }
 262
 263         MySQLresult(Module* self, Module* to, SQLerror e, unsigned int id) : SQLresult(self, to, id), currentrow(0)
 264         {
 265                 rows = 0;
 266                 error = e;
 267         }
 268
 269         ~MySQLresult()
 270         {
 271         }
 272
 273         virtual int Rows()
 274         {
 275                 return rows;
 276         }
 277
 278         virtual int Cols()
 279         {
 280                 return colnames.size();
 281         }
 282
 283         virtual std::string ColName(int column)
 284         {
 285                 if (column < (int)colnames.size())
 286                 {
 287                         return colnames[column];
 288                 }
 289                 else
 290                 {
 291                         throw SQLbadColName();
 292                 }
 293                 return "";
 294         }
 295
 296         virtual int ColNum(const std::string &column)
 297         {
 298                 for (unsigned int i = 0; i < colnames.size(); i++)
 299                 {
 300                         if (column == colnames[i])
 301                                 return i;
 302                 }
 303                 throw SQLbadColName();
 304                 return 0;
 305         }
 306
 307         virtual SQLfield GetValue(int row, int column)
 308         {
 309                 if ((row >= 0) && (row < rows) && (column >= 0) && (column < Cols()))
 310                 {
 311                         return fieldlists[row][column];
 312                 }
 313
 314                 throw SQLbadColName();
 315
 316                 /* XXX: We never actually get here because of the throw */
 317                 return SQLfield("",true);
 318         }
 319
 320         virtual SQLfieldList& GetRow()
 321         {
 322                 if (currentrow < rows)
 323                         return fieldlists[currentrow];
 324                 else
 325                         return emptyfieldlist;
 326         }
 327
 328         virtual SQLfieldMap& GetRowMap()
 329         {
 330                 fieldmap2.clear();
 331
 332                 if (currentrow < rows)
 333                 {
 334                         for (int i = 0; i < Cols(); i++)
 335                         {
 336                                 fieldmap2.insert(std::make_pair(colnames[i],GetValue(currentrow, i)));
 337                         }
 338                         currentrow++;
 339                 }
 340
 341                 return fieldmap2;
 342         }
 343
 344         virtual SQLfieldList* GetRowPtr()
 345         {
 346                 SQLfieldList* fieldlist = new SQLfieldList();
 347
 348                 if (currentrow < rows)
 349                 {
 350                         for (int i = 0; i < Rows(); i++)
 351                         {
 352                                 fieldlist->push_back(fieldlists[currentrow][i]);
 353                         }
 354                         currentrow++;
 355                 }
 356                 return fieldlist;
 357         }
 358
 359         virtual SQLfieldMap* GetRowMapPtr()
 360         {
 361                 fieldmap = new SQLfieldMap();
 362
 363                 if (currentrow < rows)
 364                 {
 365                         for (int i = 0; i < Cols(); i++)
 366                         {
 367                                 fieldmap->insert(std::make_pair(colnames[i],GetValue(currentrow, i)));
 368                         }
 369                         currentrow++;
 370                 }
 371
 372                 return fieldmap;
 373         }
 374
 375         virtual void Free(SQLfieldMap* fm)
 376         {
 377                 delete fm;
 378         }
 379
 380         virtual void Free(SQLfieldList* fl)
 381         {
 382                 delete fl;
 383         }
 384 };
 385
 386 class SQLConnection;
 387
 388 void NotifyMainThread(SQLConnection* connection_with_new_result);
 389
 390 /** Represents a connection to a mysql database
 391  */
 392 class SQLConnection : public classbase
 393 {
 394  protected:
 395
 396         MYSQL connection;
 397         MYSQL_RES *res;
 398         MYSQL_ROW row;
 399         std::string host;
 400         std::string user;
 401         std::string pass;
 402         std::string db;
 403         std::map<std::string,std::string> thisrow;
 404         bool Enabled;
 405         std::string id;
 406
 407  public:
 408
 409         QueryQueue queue;
 410         ResultQueue rq;
 411
 412         // This constructor creates an SQLConnection object with the given credentials, but does not connect yet.
 413         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)
 414         {
 415         }
 416
 417         // This method connects to the database using the credentials supplied to the constructor, and returns
 418         // true upon success.
 419         bool Connect()
 420         {
 421                 unsigned int timeout = 1;
 422                 mysql_init(&connection);
 423                 mysql_options(&connection,MYSQL_OPT_CONNECT_TIMEOUT,(char*)&timeout);
 424                 return mysql_real_connect(&connection, host.c_str(), user.c_str(), pass.c_str(), db.c_str(), 0, NULL, 0);
 425         }
 426
 427         void DoLeadingQuery()
 428         {
 429                 if (!CheckConnection())
 430                         return;
 431
 432                 /* Parse the command string and dispatch it to mysql */
 433                 SQLrequest& req = queue.front();
 434
 435                 /* Pointer to the buffer we screw around with substitution in */
 436                 char* query;
 437
 438                 /* Pointer to the current end of query, where we append new stuff */
 439                 char* queryend;
 440
 441                 /* Total length of the unescaped parameters */
 442                 unsigned long paramlen;
 443
 444                 /* Total length of query, used for binary-safety in mysql_real_query */
 445                 unsigned long querylength = 0;
 446
 447                 paramlen = 0;
 448
 449                 for(ParamL::iterator i = req.query.p.begin(); i != req.query.p.end(); i++)
 450                 {
 451                         paramlen += i->size();
 452                 }
 453
 454                 /* To avoid a lot of allocations, allocate enough memory for the biggest the escaped query could possibly be.
 455                  * sizeofquery + (totalparamlength*2) + 1
 456                  *
 457                  * The +1 is for null-terminating the string for mysql_real_escape_string
 458                  */
 459
 460                 query = new char[req.query.q.length() + (paramlen*2)];
 461                 queryend = query;
 462
 463                 /* Okay, now we have a buffer large enough we need to start copying the query into it and escaping and substituting
 464                  * the parameters into it...
 465                  */
 466
 467                 for(unsigned long i = 0; i < req.query.q.length(); i++)
 468                 {
 469                         if(req.query.q[i] == '?')
 470                         {
 471                                 /* We found a place to substitute..what fun.
 472                                  * use mysql calls to escape and write the
 473                                  * escaped string onto the end of our query buffer,
 474                                  * then we "just" need to make sure queryend is
 475                                  * pointing at the right place.
 476                                  */
 477                                 if(req.query.p.size())
 478                                 {
 479                                         unsigned long len = mysql_real_escape_string(&connection, queryend, req.query.p.front().c_str(), req.query.p.front().length());
 480
 481                                         queryend += len;
 482                                         req.query.p.pop_front();
 483                                 }
 484                                 else
 485                                         break;
 486                         }
 487                         else
 488                         {
 489                                 *queryend = req.query.q[i];
 490                                 queryend++;
 491                         }
 492                         querylength++;
 493                 }
 494
 495                 *queryend = 0;
 496
 497                 pthread_mutex_lock(&queue_mutex);
 498                 req.query.q = query;
 499                 pthread_mutex_unlock(&queue_mutex);
 500
 501                 if (!mysql_real_query(&connection, req.query.q.data(), req.query.q.length()))
 502                 {
 503                         /* Successfull query */
 504                         res = mysql_use_result(&connection);
 505                         unsigned long rows = mysql_affected_rows(&connection);
 506                         MySQLresult* r = new MySQLresult(SQLModule, req.GetSource(), res, rows, req.id);
 507                         r->dbid = this->GetID();
 508                         r->query = req.query.q;
 509                         /* Put this new result onto the results queue.
 510                          * XXX: Remember to mutex the queue!
 511                          */
 512                         pthread_mutex_lock(&results_mutex);
 513                         rq.push_back(r);
 514                         pthread_mutex_unlock(&results_mutex);
 515                 }
 516                 else
 517                 {
 518                         /* XXX: See /usr/include/mysql/mysqld_error.h for a list of
 519                          * possible error numbers and error messages */
 520                         SQLerror e(QREPLY_FAIL, ConvToStr(mysql_errno(&connection)) + std::string(": ") + mysql_error(&connection));
 521                         MySQLresult* r = new MySQLresult(SQLModule, req.GetSource(), e, req.id);
 522                         r->dbid = this->GetID();
 523                         r->query = req.query.q;
 524
 525                         pthread_mutex_lock(&results_mutex);
 526                         rq.push_back(r);
 527                         pthread_mutex_unlock(&results_mutex);
 528                 }
 529
 530                 /* Now signal the main thread that we've got a result to process.
 531                  * Pass them this connection id as what to examine
 532                  */
 533
 534                 delete[] query;
 535
 536                 NotifyMainThread(this);
 537         }
 538
 539         bool ConnectionLost()
 540         {
 541                 if (&connection) {
 542                         return (mysql_ping(&connection) != 0);
 543                 }
 544                 else return false;
 545         }
 546
 547         bool CheckConnection()
 548         {
 549                 if (ConnectionLost()) {
 550                         return Connect();
 551                 }
 552                 else return true;
 553         }
 554
 555         std::string GetError()
 556         {
 557                 return mysql_error(&connection);
 558         }
 559
 560         const std::string& GetID()
 561         {
 562                 return id;
 563         }
 564
 565         std::string GetHost()
 566         {
 567                 return host;
 568         }
 569
 570         void SetEnable(bool Enable)
 571         {
 572                 Enabled = Enable;
 573         }
 574
 575         bool IsEnabled()
 576         {
 577                 return Enabled;
 578         }
 579
 580 };
 581
 582 ConnMap Connections;
 583
 584 void ConnectDatabases(InspIRCd* ServerInstance)
 585 {
 586         for (ConnMap::iterator i = Connections.begin(); i != Connections.end(); i++)
 587         {
 588                 i->second->SetEnable(true);
 589                 if (i->second->Connect())
 590                 {
 591                         ServerInstance->Log(DEFAULT,"SQL: Successfully connected database "+i->second->GetHost());
 592                 }
 593                 else
 594                 {
 595                         ServerInstance->Log(DEFAULT,"SQL: Failed to connect database "+i->second->GetHost()+": Error: "+i->second->GetError());
 596                         i->second->SetEnable(false);
 597                 }
 598         }
 599 }
 600
 601
 602 void LoadDatabases(ConfigReader* ThisConf, InspIRCd* ServerInstance)
 603 {
 604         ServerInstance->Log(DEFAULT,"SQL: Loading database settings");
 605         Connections.clear();
 606         ServerInstance->Log(DEBUG,"Cleared connections");
 607         for (int j =0; j < ThisConf->Enumerate("database"); j++)
 608         {
 609                 std::string db = ThisConf->ReadValue("database","name",j);
 610                 std::string user = ThisConf->ReadValue("database","username",j);
 611                 std::string pass = ThisConf->ReadValue("database","password",j);
 612                 std::string host = ThisConf->ReadValue("database","hostname",j);
 613                 std::string id = ThisConf->ReadValue("database","id",j);
 614                 ServerInstance->Log(DEBUG,"Read database settings");
 615                 if ((db != "") && (host != "") && (user != "") && (id != "") && (pass != ""))
 616                 {
 617                         SQLConnection* ThisSQL = new SQLConnection(host,user,pass,db,id);
 618                         ServerInstance->Log(DEFAULT,"Loaded database: "+ThisSQL->GetHost());
 619                         Connections[id] = ThisSQL;
 620                         ServerInstance->Log(DEBUG,"Pushed back connection");
 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                 DELETE(Conf);
 807         }
 808
 809         virtual void OnRehash(const std::string &parameter)
 810         {
 811                 /* TODO: set rehash bool here, which makes the dispatcher thread rehash at next opportunity */
 812         }
 813
 814         virtual Version GetVersion()
 815         {
 816                 return Version(1,1,0,0,VF_VENDOR|VF_SERVICEPROVIDER,API_VERSION);
 817         }
 818
 819 };
 820
 821 void* DispatcherThread(void* arg)
 822 {
 823         ModuleSQL* thismodule = (ModuleSQL*)arg;
 824         LoadDatabases(thismodule->Conf, thismodule->PublicServerInstance);
 825
 826         /* Connect back to the Notifier */
 827
 828         if ((QueueFD = socket(AF_FAMILY, SOCK_STREAM, 0)) == -1)
 829         {
 830                 /* crap, we're out of sockets... */
 831                 return NULL;
 832         }
 833
 834         insp_sockaddr addr;
 835
 836 #ifdef IPV6
 837         insp_aton("::1", &addr.sin6_addr);
 838         addr.sin6_family = AF_FAMILY;
 839         addr.sin6_port = htons(MessagePipe->GetPort());
 840 #else
 841         insp_inaddr ia;
 842         insp_aton("127.0.0.1", &ia);
 843         addr.sin_family = AF_FAMILY;
 844         addr.sin_addr = ia;
 845         addr.sin_port = htons(MessagePipe->GetPort());
 846 #endif
 847
 848         if (connect(QueueFD, (sockaddr*)&addr,sizeof(addr)) == -1)
 849         {
 850                 /* wtf, we cant connect to it, but we just created it! */
 851                 return NULL;
 852         }
 853
 854         while (!giveup)
 855         {
 856                 SQLConnection* conn = NULL;
 857                 /* XXX: Lock here for safety */
 858                 pthread_mutex_lock(&queue_mutex);
 859                 for (ConnMap::iterator i = Connections.begin(); i != Connections.end(); i++)
 860                 {
 861                         if (i->second->queue.totalsize())
 862                         {
 863                                 conn = i->second;
 864                                 break;
 865                         }
 866                 }
 867                 pthread_mutex_unlock(&queue_mutex);
 868                 /* XXX: Unlock */
 869
 870                 /* Theres an item! */
 871                 if (conn)
 872                 {
 873                         conn->DoLeadingQuery();
 874
 875                         /* XXX: Lock */
 876                         pthread_mutex_lock(&queue_mutex);
 877                         conn->queue.pop();
 878                         pthread_mutex_unlock(&queue_mutex);
 879                         /* XXX: Unlock */
 880                 }
 881
 882                 usleep(50);
 883         }
 884
 885         return NULL;
 886 }
 887
 888
 889 // stuff down here is the module-factory stuff. For basic modules you can ignore this.
 890
 891 class ModuleSQLFactory : public ModuleFactory
 892 {
 893  public:
 894         ModuleSQLFactory()
 895         {
 896         }
 897
 898         ~ModuleSQLFactory()
 899         {
 900         }
 901
 902         virtual Module * CreateModule(InspIRCd* Me)
 903         {
 904                 return new ModuleSQL(Me);
 905         }
 906
 907 };
 908
 909
 910 extern "C" void * init_module( void )
 911 {
 912         return new ModuleSQLFactory;
 913 }