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 "helperfuncs.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 ../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 extern InspIRCd* ServerInstance;
  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 class QueryQueue : public classbase
  88 {
  89 private:
  90         typedef std::deque<SQLrequest> ReqDeque;
  91
  92         ReqDeque priority;      /* The priority queue */
  93         ReqDeque normal;        /* The 'normal' queue */
  94         enum { PRI, NOR, NON } which;   /* Which queue the currently active element is at the front of */
  95
  96 public:
  97         QueryQueue()
  98         : which(NON)
  99         {
 100         }
 101
 102         void push(const SQLrequest &q)
 103         {
 104                 log(DEBUG, "QueryQueue::push(): Adding %s query to queue: %s", ((q.pri) ? "priority" : "non-priority"), q.query.q.c_str());
 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 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         int rows;
 211         int cols;
 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                 log(DEBUG,"Created new MySQLresult of non-error type");
 219                 fieldlists.clear();
 220                 rows = 0;
 221                 if (affected_rows >= 1)
 222                 {
 223                         rows = affected_rows;
 224                         fieldlists.resize(rows);
 225                 }
 226                 unsigned int field_count = 0;
 227                 if (res)
 228                 {
 229                         MYSQL_ROW row;
 230                         int n = 0;
 231                         while ((row = mysql_fetch_row(res)))
 232                         {
 233                                 if (fieldlists.size() < (unsigned int)rows+1)
 234                                 {
 235                                         fieldlists.resize(fieldlists.size()+1);
 236                                 }
 237                                 field_count = 0;
 238                                 MYSQL_FIELD *fields = mysql_fetch_fields(res);
 239                                 if(mysql_num_fields(res) == 0)
 240                                         break;
 241                                 if (fields && mysql_num_fields(res))
 242                                 {
 243                                         colnames.clear();
 244                                         while (field_count < mysql_num_fields(res))
 245                                         {
 246                                                 std::string a = (fields[field_count].name ? fields[field_count].name : "");
 247                                                 std::string b = (row[field_count] ? row[field_count] : "");
 248                                                 SQLfield sqlf(b, !row[field_count]);
 249                                                 colnames.push_back(a);
 250                                                 fieldlists[n].push_back(sqlf);
 251                                                 log(DEBUG,"Inc field count to %d",field_count+1);
 252                                                 field_count++;
 253                                         }
 254                                         n++;
 255                                 }
 256                                 rows++;
 257                         }
 258                         mysql_free_result(res);
 259                 }
 260                 log(DEBUG, "Created new MySQL result; %d rows, %d columns", rows, colnames.size());
 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                 log(DEBUG,"Created new MySQLresult of error type");
 268         }
 269
 270         ~MySQLresult()
 271         {
 272         }
 273
 274         virtual int Rows()
 275         {
 276                 return rows;
 277         }
 278
 279         virtual int Cols()
 280         {
 281                 return colnames.size();
 282         }
 283
 284         virtual std::string ColName(int column)
 285         {
 286                 if (column < (int)colnames.size())
 287                 {
 288                         return colnames[column];
 289                 }
 290                 else
 291                 {
 292                         throw SQLbadColName();
 293                 }
 294                 return "";
 295         }
 296
 297         virtual int ColNum(const std::string &column)
 298         {
 299                 for (unsigned int i = 0; i < colnames.size(); i++)
 300                 {
 301                         if (column == colnames[i])
 302                                 return i;
 303                 }
 304                 throw SQLbadColName();
 305                 return 0;
 306         }
 307
 308         virtual SQLfield GetValue(int row, int column)
 309         {
 310                 if ((row >= 0) && (row < rows) && (column >= 0) && (column < Cols()))
 311                 {
 312                         return fieldlists[row][column];
 313                 }
 314
 315                 log(DEBUG,"Danger will robinson, we don't have row %d, column %d!", row, column);
 316                 throw SQLbadColName();
 317
 318                 /* XXX: We never actually get here because of the throw */
 319                 return SQLfield("",true);
 320         }
 321
 322         virtual SQLfieldList& GetRow()
 323         {
 324                 return fieldlists[currentrow];
 325         }
 326
 327         virtual SQLfieldMap& GetRowMap()
 328         {
 329                 fieldmap2 = SQLfieldMap();
 330
 331                 if (currentrow < rows)
 332                 {
 333                         for (int i = 0; i < cols; i++)
 334                         {
 335                                 fieldmap2.insert(std::make_pair(colnames[cols],GetValue(currentrow, i)));
 336                         }
 337                         currentrow++;
 338                 }
 339
 340                 return fieldmap2;
 341         }
 342
 343         virtual SQLfieldList* GetRowPtr()
 344         {
 345                 return &fieldlists[currentrow++];
 346         }
 347
 348         virtual SQLfieldMap* GetRowMapPtr()
 349         {
 350                 fieldmap = new SQLfieldMap();
 351
 352                 if (currentrow < rows)
 353                 {
 354                         for (int i = 0; i < cols; i++)
 355                         {
 356                                 fieldmap->insert(std::make_pair(colnames[cols],GetValue(currentrow, i)));
 357                         }
 358                         currentrow++;
 359                 }
 360
 361                 return fieldmap;
 362         }
 363
 364         virtual void Free(SQLfieldMap* fm)
 365         {
 366                 delete fm;
 367         }
 368
 369         virtual void Free(SQLfieldList* fl)
 370         {
 371                 /* XXX: Yes, this is SUPPOSED to do nothing, we
 372                  * dont want to free our fieldlist until we
 373                  * destruct the object. Unlike the pgsql module,
 374                  * we only have the one.
 375                  */
 376         }
 377 };
 378
 379 class SQLConnection;
 380
 381 void NotifyMainThread(SQLConnection* connection_with_new_result);
 382
 383 class SQLConnection : public classbase
 384 {
 385  protected:
 386
 387         MYSQL connection;
 388         MYSQL_RES *res;
 389         MYSQL_ROW row;
 390         std::string host;
 391         std::string user;
 392         std::string pass;
 393         std::string db;
 394         std::map<std::string,std::string> thisrow;
 395         bool Enabled;
 396         std::string id;
 397
 398  public:
 399
 400         QueryQueue queue;
 401         ResultQueue rq;
 402
 403         // This constructor creates an SQLConnection object with the given credentials, and creates the underlying
 404         // MYSQL struct, but does not connect yet.
 405         SQLConnection(std::string thishost, std::string thisuser, std::string thispass, std::string thisdb, const std::string &myid)
 406         {
 407                 this->Enabled = true;
 408                 this->host = thishost;
 409                 this->user = thisuser;
 410                 this->pass = thispass;
 411                 this->db = thisdb;
 412                 this->id = myid;
 413         }
 414
 415         // This method connects to the database using the credentials supplied to the constructor, and returns
 416         // true upon success.
 417         bool Connect()
 418         {
 419                 unsigned int timeout = 1;
 420                 mysql_init(&connection);
 421                 mysql_options(&connection,MYSQL_OPT_CONNECT_TIMEOUT,(char*)&timeout);
 422                 return mysql_real_connect(&connection, host.c_str(), user.c_str(), pass.c_str(), db.c_str(), 0, NULL, 0);
 423         }
 424
 425         void DoLeadingQuery()
 426         {
 427                 if (!CheckConnection())
 428                         return;
 429
 430                 /* Parse the command string and dispatch it to mysql */
 431                 SQLrequest& req = queue.front();
 432                 log(DEBUG,"DO QUERY: %s",req.query.q.c_str());
 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                                 {
 485                                         log(DEBUG, "Found a substitution location but no parameter to substitute :|");
 486                                         break;
 487                                 }
 488                         }
 489                         else
 490                         {
 491                                 *queryend = req.query.q[i];
 492                                 queryend++;
 493                         }
 494                         querylength++;
 495                 }
 496
 497                 *queryend = 0;
 498
 499                 log(DEBUG, "Attempting to dispatch query: %s", query);
 500
 501                 pthread_mutex_lock(&queue_mutex);
 502                 req.query.q = query;
 503                 pthread_mutex_unlock(&queue_mutex);
 504
 505                 log(DEBUG,"REQUEST ID: %d",req.id);
 506
 507                 if (!mysql_real_query(&connection, req.query.q.data(), req.query.q.length()))
 508                 {
 509                         /* Successfull query */
 510                         res = mysql_use_result(&connection);
 511                         unsigned long rows = mysql_affected_rows(&connection);
 512                         MySQLresult* r = new MySQLresult(SQLModule, req.GetSource(), res, rows, req.id);
 513                         r->dbid = this->GetID();
 514                         r->query = req.query.q;
 515                         /* Put this new result onto the results queue.
 516                          * XXX: Remember to mutex the queue!
 517                          */
 518                         pthread_mutex_lock(&results_mutex);
 519                         rq.push_back(r);
 520                         pthread_mutex_unlock(&results_mutex);
 521                 }
 522                 else
 523                 {
 524                         /* XXX: See /usr/include/mysql/mysqld_error.h for a list of
 525                          * possible error numbers and error messages */
 526                         log(DEBUG,"SQL ERROR: %s",mysql_error(&connection));
 527                         SQLerror e(QREPLY_FAIL, ConvToStr(mysql_errno(&connection)) + std::string(": ") + mysql_error(&connection));
 528                         MySQLresult* r = new MySQLresult(SQLModule, req.GetSource(), e, req.id);
 529                         r->dbid = this->GetID();
 530                         r->query = req.query.q;
 531
 532                         pthread_mutex_lock(&results_mutex);
 533                         rq.push_back(r);
 534                         pthread_mutex_unlock(&results_mutex);
 535                 }
 536
 537                 /* Now signal the main thread that we've got a result to process.
 538                  * Pass them this connection id as what to examine
 539                  */
 540
 541                 NotifyMainThread(this);
 542         }
 543
 544         bool ConnectionLost()
 545         {
 546                 if (&connection) {
 547                         return (mysql_ping(&connection) != 0);
 548                 }
 549                 else return false;
 550         }
 551
 552         bool CheckConnection()
 553         {
 554                 if (ConnectionLost()) {
 555                         return Connect();
 556                 }
 557                 else return true;
 558         }
 559
 560         std::string GetError()
 561         {
 562                 return mysql_error(&connection);
 563         }
 564
 565         const std::string& GetID()
 566         {
 567                 return id;
 568         }
 569
 570         std::string GetHost()
 571         {
 572                 return host;
 573         }
 574
 575         void SetEnable(bool Enable)
 576         {
 577                 Enabled = Enable;
 578         }
 579
 580         bool IsEnabled()
 581         {
 582                 return Enabled;
 583         }
 584
 585 };
 586
 587 ConnMap Connections;
 588
 589 void ConnectDatabases(Server* Srv)
 590 {
 591         for (ConnMap::iterator i = Connections.begin(); i != Connections.end(); i++)
 592         {
 593                 i->second->SetEnable(true);
 594                 if (i->second->Connect())
 595                 {
 596                         Srv->Log(DEFAULT,"SQL: Successfully connected database "+i->second->GetHost());
 597                 }
 598                 else
 599                 {
 600                         Srv->Log(DEFAULT,"SQL: Failed to connect database "+i->second->GetHost()+": Error: "+i->second->GetError());
 601                         i->second->SetEnable(false);
 602                 }
 603         }
 604 }
 605
 606
 607 void LoadDatabases(ConfigReader* ThisConf, Server* Srv)
 608 {
 609         Srv->Log(DEFAULT,"SQL: Loading database settings");
 610         Connections.clear();
 611         Srv->Log(DEBUG,"Cleared connections");
 612         for (int j =0; j < ThisConf->Enumerate("database"); j++)
 613         {
 614                 std::string db = ThisConf->ReadValue("database","name",j);
 615                 std::string user = ThisConf->ReadValue("database","username",j);
 616                 std::string pass = ThisConf->ReadValue("database","password",j);
 617                 std::string host = ThisConf->ReadValue("database","hostname",j);
 618                 std::string id = ThisConf->ReadValue("database","id",j);
 619                 Srv->Log(DEBUG,"Read database settings");
 620                 if ((db != "") && (host != "") && (user != "") && (id != "") && (pass != ""))
 621                 {
 622                         SQLConnection* ThisSQL = new SQLConnection(host,user,pass,db,id);
 623                         Srv->Log(DEFAULT,"Loaded database: "+ThisSQL->GetHost());
 624                         Connections[id] = ThisSQL;
 625                         Srv->Log(DEBUG,"Pushed back connection");
 626                 }
 627         }
 628         ConnectDatabases(Srv);
 629 }
 630
 631 void NotifyMainThread(SQLConnection* connection_with_new_result)
 632 {
 633         /* Here we write() to the socket the main thread has open
 634          * and we connect()ed back to before our thread became active.
 635          * The main thread is using a nonblocking socket tied into
 636          * the socket engine, so they wont block and they'll receive
 637          * nearly instant notification. Because we're in a seperate
 638          * thread, we can just use standard connect(), and we can
 639          * block if we like. We just send the connection id of the
 640          * connection back.
 641          */
 642         log(DEBUG,"Notify of result on connection: %s",connection_with_new_result->GetID().c_str());
 643         if (send(QueueFD, connection_with_new_result->GetID().c_str(), connection_with_new_result->GetID().length()+1, 0) < 1) // add one for null terminator
 644         {
 645                 log(DEBUG,"Error writing to QueueFD: %s",strerror(errno));
 646         }
 647         log(DEBUG,"Sent it on its way via fd=%d",QueueFD);
 648 }
 649
 650 void* DispatcherThread(void* arg);
 651
 652 class Notifier : public InspSocket
 653 {
 654         sockaddr_in sock_us;
 655         socklen_t uslen;
 656         Server* Srv;
 657
 658  public:
 659
 660         /* Create a socket on a random port. Let the tcp stack allocate us an available port */
 661         Notifier(Server* S) : InspSocket("127.0.0.1", 0, true, 3000), Srv(S)
 662         {
 663                 uslen = sizeof(sock_us);
 664                 if (getsockname(this->fd,(sockaddr*)&sock_us,&uslen))
 665                 {
 666                         throw ModuleException("Could not create random listening port on localhost");
 667                 }
 668         }
 669
 670         Notifier(int newfd, char* ip, Server* S) : InspSocket(newfd, ip), Srv(S)
 671         {
 672                 log(DEBUG,"Constructor of new socket");
 673         }
 674
 675         /* Using getsockname and ntohs, we can determine which port number we were allocated */
 676         int GetPort()
 677         {
 678                 return ntohs(sock_us.sin_port);
 679         }
 680
 681         virtual int OnIncomingConnection(int newsock, char* ip)
 682         {
 683                 log(DEBUG,"Inbound connection on fd %d!",newsock);
 684                 Notifier* n = new Notifier(newsock, ip, Srv);
 685                 Srv->AddSocket(n);
 686                 return true;
 687         }
 688
 689         virtual bool OnDataReady()
 690         {
 691                 log(DEBUG,"Inbound data!");
 692                 char* data = this->Read();
 693                 ConnMap::iterator iter;
 694
 695                 if (data && *data)
 696                 {
 697                         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                                 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 class ModuleSQL : public Module
 718 {
 719  public:
 720         Server *Srv;
 721         ConfigReader *Conf;
 722         pthread_t Dispatcher;
 723         int currid;
 724
 725         void Implements(char* List)
 726         {
 727                 List[I_OnRehash] = List[I_OnRequest] = 1;
 728         }
 729
 730         unsigned long NewID()
 731         {
 732                 if (currid+1 == 0)
 733                         currid++;
 734                 return ++currid;
 735         }
 736
 737         char* OnRequest(Request* request)
 738         {
 739                 if(strcmp(SQLREQID, request->GetData()) == 0)
 740                 {
 741                         SQLrequest* req = (SQLrequest*)request;
 742
 743                         /* XXX: Lock */
 744                         pthread_mutex_lock(&queue_mutex);
 745
 746                         ConnMap::iterator iter;
 747
 748                         char* returnval = NULL;
 749
 750                         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());
 751
 752                         if((iter = Connections.find(req->dbid)) != Connections.end())
 753                         {
 754                                 req->id = NewID();
 755                                 iter->second->queue.push(*req);
 756                                 returnval = SQLSUCCESS;
 757                         }
 758                         else
 759                         {
 760                                 req->error.Id(BAD_DBID);
 761                         }
 762
 763                         pthread_mutex_unlock(&queue_mutex);
 764                         /* XXX: Unlock */
 765
 766                         return returnval;
 767                 }
 768
 769                 log(DEBUG, "Got unsupported API version string: %s", request->GetData());
 770
 771                 return NULL;
 772         }
 773
 774         ModuleSQL(Server* Me)
 775                 : Module::Module(Me)
 776         {
 777                 Srv = Me;
 778                 Conf = new ConfigReader();
 779                 currid = 0;
 780                 SQLModule = this;
 781
 782                 MessagePipe = new Notifier(Srv);
 783                 Srv->AddSocket(MessagePipe);
 784                 log(DEBUG,"Bound notifier to 127.0.0.1:%d",MessagePipe->GetPort());
 785
 786                 pthread_attr_t attribs;
 787                 pthread_attr_init(&attribs);
 788                 pthread_attr_setdetachstate(&attribs, PTHREAD_CREATE_DETACHED);
 789                 if (pthread_create(&this->Dispatcher, &attribs, DispatcherThread, (void *)this) != 0)
 790                 {
 791                         throw ModuleException("m_mysql: Failed to create dispatcher thread: " + std::string(strerror(errno)));
 792                 }
 793                 if (!Srv->PublishFeature("SQL", this))
 794                 {
 795                         /* Tell worker thread to exit NOW */
 796                         giveup = true;
 797                         throw ModuleException("m_mysql: Unable to publish feature 'SQL'");
 798                 }
 799         }
 800
 801         virtual ~ModuleSQL()
 802         {
 803                 DELETE(Conf);
 804         }
 805
 806         virtual void OnRehash(const std::string &parameter)
 807         {
 808                 /* TODO: set rehash bool here, which makes the dispatcher thread rehash at next opportunity */
 809         }
 810
 811         virtual Version GetVersion()
 812         {
 813                 return Version(1,1,0,0,VF_VENDOR|VF_SERVICEPROVIDER);
 814         }
 815
 816 };
 817
 818 void* DispatcherThread(void* arg)
 819 {
 820         log(DEBUG,"Starting Dispatcher thread, mysql version %d",mysql_get_client_version());
 821         ModuleSQL* thismodule = (ModuleSQL*)arg;
 822         LoadDatabases(thismodule->Conf, thismodule->Srv);
 823
 824         /* Connect back to the Notifier */
 825
 826         if ((QueueFD = socket(AF_INET, SOCK_STREAM, 0)) == -1)
 827         {
 828                 /* crap, we're out of sockets... */
 829                 log(DEBUG,"QueueFD cant be created");
 830                 return NULL;
 831         }
 832
 833         log(DEBUG,"Initialize QueueFD to %d",QueueFD);
 834
 835         sockaddr_in addr;
 836         in_addr ia;
 837         inet_aton("127.0.0.1", &ia);
 838         addr.sin_family = AF_INET;
 839         addr.sin_addr = ia;
 840         addr.sin_port = htons(MessagePipe->GetPort());
 841
 842         if (connect(QueueFD, (sockaddr*)&addr,sizeof(addr)) == -1)
 843         {
 844                 /* wtf, we cant connect to it, but we just created it! */
 845                 log(DEBUG,"QueueFD cant connect!");
 846                 return NULL;
 847         }
 848
 849         log(DEBUG,"Connect QUEUE FD");
 850
 851         while (!giveup)
 852         {
 853                 SQLConnection* conn = NULL;
 854                 /* XXX: Lock here for safety */
 855                 pthread_mutex_lock(&queue_mutex);
 856                 for (ConnMap::iterator i = Connections.begin(); i != Connections.end(); i++)
 857                 {
 858                         if (i->second->queue.totalsize())
 859                         {
 860                                 conn = i->second;
 861                                 break;
 862                         }
 863                 }
 864                 pthread_mutex_unlock(&queue_mutex);
 865                 /* XXX: Unlock */
 866
 867                 /* Theres an item! */
 868                 if (conn)
 869                 {
 870                         log(DEBUG,"Process Leading query");
 871                         conn->DoLeadingQuery();
 872
 873                         /* XXX: Lock */
 874                         pthread_mutex_lock(&queue_mutex);
 875                         conn->queue.pop();
 876                         pthread_mutex_unlock(&queue_mutex);
 877                         /* XXX: Unlock */
 878                 }
 879
 880                 usleep(50);
 881         }
 882
 883         return NULL;
 884 }
 885
 886
 887 // stuff down here is the module-factory stuff. For basic modules you can ignore this.
 888
 889 class ModuleSQLFactory : public ModuleFactory
 890 {
 891  public:
 892         ModuleSQLFactory()
 893         {
 894         }
 895
 896         ~ModuleSQLFactory()
 897         {
 898         }
 899
 900         virtual Module * CreateModule(Server* Me)
 901         {
 902                 return new ModuleSQL(Me);
 903         }
 904
 905 };
 906
 907
 908 extern "C" void * init_module( void )
 909 {
 910         return new ModuleSQLFactory;
 911 }
 912