summaryrefslogtreecommitdiff
path: root/src/modules/extra/m_pgsql.cpp
blob: b417fc0192b039185240dfcb263725789e0ed933 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
/*       +------------------------------------+
 *       | Inspire Internet Relay Chat Daemon |
 *       +------------------------------------+
 *
 *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
 * See: http://wiki.inspircd.org/Credits
 *
 * This program is free but copyrighted software; see
 *            the file COPYING for details.
 *
 * ---------------------------------------------------
 */

#include "inspircd.h"
#include <cstdlib>
#include <sstream>
#include <libpq-fe.h>
#include "m_sqlv2.h"

/* $ModDesc: PostgreSQL Service Provider module for all other m_sql* modules, uses v2 of the SQL API */
/* $CompileFlags: -Iexec("pg_config --includedir") eval("my $s = `pg_config --version`;$s =~ /^.*?(\d+)\.(\d+)\.(\d+).*?$/;my $v = hex(sprintf("0x%02x%02x%02x", $1, $2, $3));print "-DPGSQL_HAS_ESCAPECONN" if(($v >= 0x080104) || ($v >= 0x07030F && $v < 0x070400) || ($v >= 0x07040D && $v < 0x080000) || ($v >= 0x080008 && $v < 0x080100));") */
/* $LinkerFlags: -Lexec("pg_config --libdir") -lpq */
/* $ModDep: m_sqlv2.h */


/* SQLConn rewritten by peavey to
 * use EventHandler instead of
 * BufferedSocket. This is much neater
 * and gives total control of destroy
 * and delete of resources.
 */

/* Forward declare, so we can have the typedef neatly at the top */
class SQLConn;

typedef std::map<std::string, SQLConn*> ConnMap;

/* CREAD,	Connecting and wants read event
 * CWRITE,	Connecting and wants write event
 * WREAD,	Connected/Working and wants read event
 * WWRITE,	Connected/Working and wants write event
 * RREAD,	Resetting and wants read event
 * RWRITE,	Resetting and wants write event
 */
enum SQLstatus { CREAD, CWRITE, WREAD, WWRITE, RREAD, RWRITE };

unsigned long count(const char * const str, char a)
{
	unsigned long n = 0;
	for (const char *p = reinterpret_cast<const char *>(str); *p; ++p)
	{
		if (*p == '?')
			++n;
	}
	return n;
}

/** SQLhost::GetDSN() - Overload to return correct DSN for PostgreSQL
 */
std::string SQLhost::GetDSN()
{
	std::ostringstream conninfo("connect_timeout = '5'");

	if (host.length())
		conninfo << " host = '" << host << "'";

	if (port)
		conninfo << " port = '" << port << "'";

	if (name.length())
		conninfo << " dbname = '" << name << "'";

	if (user.length())
		conninfo << " user = '" << user << "'";

	if (pass.length())
		conninfo << " password = '" << pass << "'";

	if (ssl)
	{
		conninfo << " sslmode = 'require'";
	}
	else
	{
		conninfo << " sslmode = 'disable'";
	}

	return conninfo.str();
}

class ReconnectTimer : public Timer
{
 private:
	Module* mod;
 public:
	ReconnectTimer(InspIRCd* SI, Module* m)
	: Timer(5, SI->Time(), false), mod(m)
	{
	}
	virtual void Tick(time_t TIME);
};


/** PgSQLresult is a subclass of the mostly-pure-virtual class SQLresult.
 * All SQL providers must create their own subclass and define it's methods using that
 * database library's data retriveal functions. The aim is to avoid a slow and inefficient process
 * of converting all data to a common format before it reaches the result structure. This way
 * data is passes to the module nearly as directly as if it was using the API directly itself.
 */

class PgSQLresult : public SQLresult
{
	PGresult* res;
	int currentrow;
	int rows;
	int cols;

	SQLfieldList* fieldlist;
	SQLfieldMap* fieldmap;
public:
	PgSQLresult(Module* self, Module* to, unsigned long rid, PGresult* result)
	: SQLresult(self, to, rid), res(result), currentrow(0), fieldlist(NULL), fieldmap(NULL)
	{
		rows = PQntuples(res);
		cols = PQnfields(res);
	}

	~PgSQLresult()
	{
		/* If we allocated these, free them... */
		if(fieldlist)
			delete fieldlist;

		if(fieldmap)
			delete fieldmap;

		PQclear(res);
	}

	virtual int Rows()
	{
		if(!cols && !rows)
		{
			return atoi(PQcmdTuples(res));
		}
		else
		{
			return rows;
		}
	}

	virtual int Cols()
	{
		return PQnfields(res);
	}

	virtual std::string ColName(int column)
	{
		char* name = PQfname(res, column);

		return (name) ? name : "";
	}

	virtual int ColNum(const std::string &column)
	{
		int n = PQfnumber(res, column.c_str());

		if(n == -1)
		{
			throw SQLbadColName();
		}
		else
		{
			return n;
		}
	}

	virtual SQLfield GetValue(int row, int column)
	{
		char* v = PQgetvalue(res, row, column);

		if(v)
		{
			return SQLfield(std::string(v, PQgetlength(res, row, column)), PQgetisnull(res, row, column));
		}
		else
		{
			throw SQLbadColName();
		}
	}

	virtual SQLfieldList& GetRow()
	{
		/* In an effort to reduce overhead we don't actually allocate the list
		 * until the first time it's needed...so...
		 */
		if(fieldlist)
		{
			fieldlist->clear();
		}
		else
		{
			fieldlist = new SQLfieldList;
		}

		if(currentrow < PQntuples(res))
		{
			int ncols = PQnfields(res);

			for(int i = 0; i < ncols; i++)
			{
				fieldlist->push_back(GetValue(currentrow, i));
			}

			currentrow++;
		}

		return *fieldlist;
	}

	virtual SQLfieldMap& GetRowMap()
	{
		/* In an effort to reduce overhead we don't actually allocate the map
		 * until the first time it's needed...so...
		 */
		if(fieldmap)
		{
			fieldmap->clear();
		}
		else
		{
			fieldmap = new SQLfieldMap;
		}

		if(currentrow < PQntuples(res))
		{
			int ncols = PQnfields(res);

			for(int i = 0; i < ncols; i++)
			{
				fieldmap->insert(std::make_pair(ColName(i), GetValue(currentrow, i)));
			}

			currentrow++;
		}

		return *fieldmap;
	}

	virtual SQLfieldList* GetRowPtr()
	{
		SQLfieldList* fl = new SQLfieldList;

		if(currentrow < PQntuples(res))
		{
			int ncols = PQnfields(res);

			for(int i = 0; i < ncols; i++)
			{
				fl->push_back(GetValue(currentrow, i));
			}

			currentrow++;
		}

		return fl;
	}

	virtual SQLfieldMap* GetRowMapPtr()
	{
		SQLfieldMap* fm = new SQLfieldMap;

		if(currentrow < PQntuples(res))
		{
			int ncols = PQnfields(res);

			for(int i = 0; i < ncols; i++)
			{
				fm->insert(std::make_pair(ColName(i), GetValue(currentrow, i)));
			}

			currentrow++;
		}

		return fm;
	}

	virtual void Free(SQLfieldMap* fm)
	{
		delete fm;
	}

	virtual void Free(SQLfieldList* fl)
	{
		delete fl;
	}
};

/** SQLConn represents one SQL session.
 */
class SQLConn : public EventHandler
{
 private:
	InspIRCd*		ServerInstance;
	SQLhost			confhost;	/* The <database> entry */
	Module*			us;			/* Pointer to the SQL provider itself */
	PGconn* 		sql;		/* PgSQL database connection handle */
	SQLstatus		status;		/* PgSQL database connection status */
	bool			qinprog;	/* If there is currently a query in progress */
	QueryQueue		queue;		/* Queue of queries waiting to be executed on this connection */
	time_t			idle;		/* Time we last heard from the database */

 public:
	SQLConn(InspIRCd* SI, Module* self, const SQLhost& hi)
	: EventHandler(), ServerInstance(SI), confhost(hi), us(self), sql(NULL), status(CWRITE), qinprog(false)
	{
		idle = this->ServerInstance->Time();
		if(!DoConnect())
		{
			ServerInstance->Logs->Log("m_pgsql",DEFAULT, "WARNING: Could not connect to database with id: " + ConvToStr(hi.id));
			DelayReconnect();
		}
	}

	~SQLConn()
	{
		Close();
	}

	virtual void HandleEvent(EventType et, int errornum)
	{
		switch (et)
		{
			case EVENT_READ:
				OnDataReady();
			break;

			case EVENT_WRITE:
				OnWriteReady();
			break;

			case EVENT_ERROR:
				DelayReconnect();
			break;

			default:
			break;
		}
	}

	bool DoConnect()
	{
		if(!(sql = PQconnectStart(confhost.GetDSN().c_str())))
			return false;

		if(PQstatus(sql) == CONNECTION_BAD)
			return false;

		if(PQsetnonblocking(sql, 1) == -1)
			return false;

		/* OK, we've initalised the connection, now to get it hooked into the socket engine
		* and then start polling it.
		*/
		this->fd = PQsocket(sql);

		if(this->fd <= -1)
			return false;

		if (!this->ServerInstance->SE->AddFd(this))
		{
			ServerInstance->Logs->Log("m_pgsql",DEBUG, "BUG: Couldn't add pgsql socket to socket engine");
			return false;
		}

		/* Socket all hooked into the engine, now to tell PgSQL to start connecting */
		return DoPoll();
	}

	bool DoPoll()
	{
		switch(PQconnectPoll(sql))
		{
			case PGRES_POLLING_WRITING:
				ServerInstance->SE->WantWrite(this);
				status = CWRITE;
				return true;
			case PGRES_POLLING_READING:
				status = CREAD;
				return true;
			case PGRES_POLLING_FAILED:
				return false;
			case PGRES_POLLING_OK:
				status = WWRITE;
				return DoConnectedPoll();
			default:
				return true;
		}
	}

	bool DoConnectedPoll()
	{
		if(!qinprog && queue.totalsize())
		{
			/* There's no query currently in progress, and there's queries in the queue. */
			SQLrequest& query = queue.front();
			DoQuery(query);
		}

		if(PQconsumeInput(sql))
		{
			/* We just read stuff from the server, that counts as it being alive
			 * so update the idle-since time :p
			 */
			idle = this->ServerInstance->Time();

			if (PQisBusy(sql))
			{
				/* Nothing happens here */
			}
			else if (qinprog)
			{
				/* Grab the request we're processing */
				SQLrequest& query = queue.front();

				/* Get a pointer to the module we're about to return the result to */
				Module* to = query.GetSource();

				/* Fetch the result.. */
				PGresult* result = PQgetResult(sql);

				/* PgSQL would allow a query string to be sent which has multiple
				 * queries in it, this isn't portable across database backends and
				 * we don't want modules doing it. But just in case we make sure we
				 * drain any results there are and just use the last one.
				 * If the module devs are behaving there will only be one result.
				 */
				while (PGresult* temp = PQgetResult(sql))
				{
					PQclear(result);
					result = temp;
				}

				if(to)
				{
					/* ..and the result */
					PgSQLresult reply(us, to, query.id, result);

					/* Fix by brain, make sure the original query gets sent back in the reply */
					reply.query = query.query.q;

					switch(PQresultStatus(result))
					{
						case PGRES_EMPTY_QUERY:
						case PGRES_BAD_RESPONSE:
						case PGRES_FATAL_ERROR:
							reply.error.Id(SQL_QREPLY_FAIL);
							reply.error.Str(PQresultErrorMessage(result));
						default:
							;
							/* No action, other values are not errors */
					}

					reply.Send();

					/* PgSQLresult's destructor will free the PGresult */
				}
				else
				{
					/* If the client module is unloaded partway through a query then the provider will set
					 * the pointer to NULL. We cannot just cancel the query as the result will still come
					 * through at some point...and it could get messy if we play with invalid pointers...
					 */
					PQclear(result);
				}
				qinprog = false;
				queue.pop();
				DoConnectedPoll();
			}
			return true;
		}
		else
		{
			/* I think we'll assume this means the server died...it might not,
			 * but I think that any error serious enough we actually get here
			 * deserves to reconnect [/excuse]
			 * Returning true so the core doesn't try and close the connection.
			 */
			DelayReconnect();
			return true;
		}
	}

	bool DoResetPoll()
	{
		switch(PQresetPoll(sql))
		{
			case PGRES_POLLING_WRITING:
				ServerInstance->SE->WantWrite(this);
				status = CWRITE;
				return DoPoll();
			case PGRES_POLLING_READING:
				status = CREAD;
				return true;
			case PGRES_POLLING_FAILED:
				return false;
			case PGRES_POLLING_OK:
				status = WWRITE;
				return DoConnectedPoll();
			default:
				return true;
		}
	}

	bool OnDataReady()
	{
		/* Always return true here, false would close the socket - we need to do that ourselves with the pgsql API */
		return DoEvent();
	}

	bool OnWriteReady()
	{
		/* Always return true here, false would close the socket - we need to do that ourselves with the pgsql API */
		return DoEvent();
	}

	bool OnConnected()
	{
		return DoEvent();
	}

	void DelayReconnect();

	bool DoEvent()
	{
		bool ret;

		if((status == CREAD) || (status == CWRITE))
		{
			ret = DoPoll();
		}
		else if((status == RREAD) || (status == RWRITE))
		{
			ret = DoResetPoll();
		}
		else
		{
			ret = DoConnectedPoll();
		}
		return ret;
	}

	SQLerror DoQuery(SQLrequest &req)
	{
		if((status == WREAD) || (status == WWRITE))
		{
			if(!qinprog)
			{
				/* Parse the command string and dispatch it */

				/* Pointer to the buffer we screw around with substitution in */
				char* query;
				/* Pointer to the current end of query, where we append new stuff */
				char* queryend;

				/* Total length of the unescaped parameters */
				unsigned long maxparamlen, paramcount;

				/* The length of the longest parameter */
				maxparamlen = 0;

				for(ParamL::iterator i = req.query.p.begin(); i != req.query.p.end(); i++)
				{
					if (i->size() > maxparamlen)
						maxparamlen = i->size();
				}

				/* How many params are there in the query? */
				paramcount = count(req.query.q.c_str(), '?');

				/* This stores copy of params to be inserted with using numbered params 1;3B*/
				ParamL paramscopy(req.query.p);

				/* To avoid a lot of allocations, allocate enough memory for the biggest the escaped query could possibly be.
				 * sizeofquery + (maxtotalparamlength*2) + 1
				 *
				 * The +1 is for null-terminating the string for PQsendQuery()
				 */

				query = new char[req.query.q.length() + (maxparamlen*paramcount*2) + 1];
				queryend = query;

				/* Okay, now we have a buffer large enough we need to start copying the query into it and escaping and substituting
				 * the parameters into it...
				 */

				for(unsigned int i = 0; i < req.query.q.length(); i++)
				{
					if(req.query.q[i] == '?')
					{
						/* We found a place to substitute..what fun.
						 * Use the PgSQL calls to escape and write the
						 * escaped string onto the end of our query buffer,
						 * then we "just" need to make sure queryend is
						 * pointing at the right place.
						 */

						/* Is it numbered parameter?
						 */

						bool numbered;
						numbered = false;

						/* Numbered parameter number :|
						 */
						unsigned int paramnum;
						paramnum = 0;

						/* Let's check if it's a numbered param. And also calculate it's number.
						 */

						while ((i < req.query.q.length() - 1) && (req.query.q[i+1] >= '0') && (req.query.q[i+1] <= '9'))
						{
							numbered = true;
							++i;
							paramnum = paramnum * 10 + req.query.q[i] - '0';
						}

						if (paramnum > paramscopy.size() - 1)
						{
							/* index is out of range!
							 */
							numbered = false;
						}

						if (numbered)
						{
							int error = 0;
							size_t len = 0;

#ifdef PGSQL_HAS_ESCAPECONN
							len = PQescapeStringConn(sql, queryend, paramscopy[paramnum].c_str(), paramscopy[paramnum].length(), &error);
#else
							len = PQescapeString         (queryend, paramscopy[paramnum].c_str(), paramscopy[paramnum].length());
#endif
							if (error)
							{
								ServerInstance->Logs->Log("m_pgsql", DEBUG, "BUG: Apparently PQescapeStringConn() failed somehow...don't know how or what to do...");
							}

							/* Incremenet queryend to the end of the newly escaped parameter */
							queryend += len;
						}
						else if (req.query.p.size())
						{
							int error = 0;
							size_t len = 0;

#ifdef PGSQL_HAS_ESCAPECONN
							len = PQescapeStringConn(sql, queryend, req.query.p.front().c_str(), req.query.p.front().length(), &error);
#else
							len = PQescapeString         (queryend, req.query.p.front().c_str(), req.query.p.front().length());
#endif
							if(error)
							{
								ServerInstance->Logs->Log("m_pgsql",DEBUG, "BUG: Apparently PQescapeStringConn() failed somehow...don't know how or what to do...");
							}

							/* Incremenet queryend to the end of the newly escaped parameter */
							queryend += len;

							/* Remove the parameter we just substituted in */
							req.query.p.pop_front();
						}
						else
						{
							ServerInstance->Logs->Log("m_pgsql",DEBUG, "BUG: Found a substitution location but no parameter to substitute :|");
							break;
						}
					}
					else
					{
						*queryend = req.query.q[i];
						queryend++;
					}
				}

				/* Null-terminate the query */
				*queryend = 0;
				req.query.q = query;

				if(PQsendQuery(sql, query))
				{
					qinprog = true;
					delete[] query;
					return SQLerror();
				}
				else
				{
					delete[] query;
					return SQLerror(SQL_QSEND_FAIL, PQerrorMessage(sql));
				}
			}
		}
		return SQLerror(SQL_BAD_CONN, "Can't query until connection is complete");
	}

	SQLerror Query(const SQLrequest &req)
	{
		queue.push(req);

		if(!qinprog && queue.totalsize())
		{
			/* There's no query currently in progress, and there's queries in the queue. */
			SQLrequest& query = queue.front();
			return DoQuery(query);
		}
		else
		{
			return SQLerror();
		}
	}

	void OnUnloadModule(Module* mod)
	{
		queue.PurgeModule(mod);
	}

	const SQLhost GetConfHost()
	{
		return confhost;
	}

	void Close()
	{
		if (!this->ServerInstance->SE->DelFd(this))
		{
			if (sql && PQstatus(sql) == CONNECTION_BAD)
			{
				this->ServerInstance->SE->DelFd(this, true);
			}
			else
			{
				ServerInstance->Logs->Log("m_pgsql",DEBUG, "BUG: PQsocket cant be removed from socket engine!");
			}
		}

		if(sql)
		{
			PQfinish(sql);
			sql = NULL;
		}
	}

};

class ModulePgSQL : public Module
{
 private:
	ConnMap connections;
	unsigned long currid;
	char* sqlsuccess;
	ReconnectTimer* retimer;

 public:
	ModulePgSQL(InspIRCd* Me)
	: Module(Me), currid(0)
	{
		ServerInstance->Modules->UseInterface("SQLutils");

		sqlsuccess = new char[strlen(SQLSUCCESS)+1];

		strlcpy(sqlsuccess, SQLSUCCESS, strlen(SQLSUCCESS));

		if (!ServerInstance->Modules->PublishFeature("SQL", this))
		{
			throw ModuleException("BUG: PgSQL Unable to publish feature 'SQL'");
		}

		ReadConf();

		ServerInstance->Modules->PublishInterface("SQL", this);
		Implementation eventlist[] = { I_OnUnloadModule, I_OnRequest, I_OnRehash };
		ServerInstance->Modules->Attach(eventlist, this, 3);
	}

	virtual ~ModulePgSQL()
	{
		if (retimer)
			ServerInstance->Timers->DelTimer(retimer);
		ClearAllConnections();
		delete[] sqlsuccess;
		ServerInstance->Modules->UnpublishInterface("SQL", this);
		ServerInstance->Modules->UnpublishFeature("SQL");
		ServerInstance->Modules->DoneWithInterface("SQLutils");
	}


	virtual void OnRehash(User* user)
	{
		ReadConf();
	}

	bool HasHost(const SQLhost &host)
	{
		for (ConnMap::iterator iter = connections.begin(); iter != connections.end(); iter++)
		{
			if (host == iter->second->GetConfHost())
				return true;
		}
		return false;
	}

	bool HostInConf(const SQLhost &h)
	{
		ConfigReader conf(ServerInstance);
		for(int i = 0; i < conf.Enumerate("database"); i++)
		{
			SQLhost host;
			host.id		= conf.ReadValue("database", "id", i);
			host.host	= conf.ReadValue("database", "hostname", i);
			host.port	= conf.ReadInteger("database", "port", i, true);
			host.name	= conf.ReadValue("database", "name", i);
			host.user	= conf.ReadValue("database", "username", i);
			host.pass	= conf.ReadValue("database", "password", i);
			host.ssl	= conf.ReadFlag("database", "ssl", "0", i);
			if (h == host)
				return true;
		}
		return false;
	}

	void ReadConf()
	{
		ClearOldConnections();

		ConfigReader conf(ServerInstance);
		for(int i = 0; i < conf.Enumerate("database"); i++)
		{
			SQLhost host;

			host.id		= conf.ReadValue("database", "id", i);
			host.host	= conf.ReadValue("database", "hostname", i);
			host.port	= conf.ReadInteger("database", "port", i, true);
			host.name	= conf.ReadValue("database", "name", i);
			host.user	= conf.ReadValue("database", "username", i);
			host.pass	= conf.ReadValue("database", "password", i);
			host.ssl	= conf.ReadFlag("database", "ssl", "0", i);

			if (HasHost(host))
				continue;

			this->AddConn(host);
		}
	}

	void ClearOldConnections()
	{
		ConnMap::iterator iter,safei;
		for (iter = connections.begin(); iter != connections.end(); iter++)
		{
			if (!HostInConf(iter->second->GetConfHost()))
			{
				delete iter->second;
				safei = iter;
				--iter;
				connections.erase(safei);
			}
		}
	}

	void ClearAllConnections()
	{
		ConnMap::iterator i;
		while ((i = connections.begin()) != connections.end())
		{
			connections.erase(i);
			delete i->second;
		}
	}

	void AddConn(const SQLhost& hi)
	{
		if (HasHost(hi))
		{
			ServerInstance->Logs->Log("m_pgsql",DEFAULT, "WARNING: A pgsql connection with id: %s already exists. Aborting connection attempt.", hi.id.c_str());
			return;
		}

		SQLConn* newconn;

		newconn = new SQLConn(ServerInstance, this, hi);

		connections.insert(std::make_pair(hi.id, newconn));
	}

	void ReconnectConn(SQLConn* conn)
	{
		for (ConnMap::iterator iter = connections.begin(); iter != connections.end(); iter++)
		{
			if (conn == iter->second)
			{
				delete iter->second;
				connections.erase(iter);
				break;
			}
		}
		retimer = new ReconnectTimer(ServerInstance, this);
		ServerInstance->Timers->AddTimer(retimer);
	}

	virtual const char* OnRequest(Request* request)
	{
		if(strcmp(SQLREQID, request->GetId()) == 0)
		{
			SQLrequest* req = (SQLrequest*)request;
			ConnMap::iterator iter;
			if((iter = connections.find(req->dbid)) != connections.end())
			{
				/* Execute query */
				req->id = NewID();
				req->error = iter->second->Query(*req);

				return (req->error.Id() == SQL_NO_ERROR) ? sqlsuccess : NULL;
			}
			else
			{
				req->error.Id(SQL_BAD_DBID);
				return NULL;
			}
		}
		return NULL;
	}

	virtual void OnUnloadModule(Module* mod, const std::string&	name)
	{
		/* When a module unloads we have to check all the pending queries for all our connections
		 * and set the Module* specifying where the query came from to NULL. If the query has already
		 * been dispatched then when it is processed it will be dropped if the pointer is NULL.
		 *
		 * If the queries we find are not already being executed then we can simply remove them immediately.
		 */
		for(ConnMap::iterator iter = connections.begin(); iter != connections.end(); iter++)
		{
			iter->second->OnUnloadModule(mod);
		}
	}

	unsigned long NewID()
	{
		if (currid+1 == 0)
			currid++;

		return ++currid;
	}

	virtual Version GetVersion()
	{
		return Version("$Id$", VF_VENDOR|VF_SERVICEPROVIDER, API_VERSION);
	}
};

void ReconnectTimer::Tick(time_t time)
{
	((ModulePgSQL*)mod)->ReadConf();
}

void SQLConn::DelayReconnect()
{
	((ModulePgSQL*)us)->ReconnectConn(this);
}

MODULE_INIT(ModulePgSQL)