summaryrefslogtreecommitdiff
path: root/src/modules/m_watch.cpp
blob: 1d2073972131f047deb88b8b014d9a75ccaedf1f (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
/*       +------------------------------------+
 *       | 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"

/* $ModDesc: Provides support for the /WATCH command */


/*
 * Okay, it's nice that this was documented and all, but I at least understood very little
 * of it, so I'm going to attempt to explain the data structures in here a bit more.
 *
 * For efficiency, many data structures are kept.
 *
 * The first is a global list `watchentries':
 *	hash_map<irc::string, std::deque<User*> >
 *
 * That is, if nick 'w00t' is being watched by user pointer 'Brain' and 'Om', <w00t, (Brain, Om)>
 * will be in the watchentries list.
 *
 * The second is that each user has a per-user data structure attached to their user record via Extensible:
 *	std::map<irc::string, std::string> watchlist;
 * So, in the above example with w00t watched by Brain and Om, we'd have:
 * 	Brain-
 * 	      `- w00t
 * 	Om-
 * 	   `- w00t
 *
 * Hopefully this helps any brave soul that ventures into this file other than me. :-)
 *		-- w00t (mar 30, 2008)
 */


/* This module has been refactored to provide a very efficient (in terms of cpu time)
 * implementation of /WATCH.
 *
 * To improve the efficiency of watch, many lists are kept. The first primary list is
 * a hash_map of who's being watched by who. For example:
 *
 * KEY: Brain   --->  Watched by:  Boo, w00t, Om
 * KEY: Boo     --->  Watched by:  Brain, w00t
 *
 * This is used when we want to tell all the users that are watching someone that
 * they are now available or no longer available. For example, if the hash was
 * populated as shown above, then when Brain signs on, messages are sent to Boo, w00t
 * and Om by reading their 'watched by' list. When this occurs, their online status
 * in each of these users lists (see below) is also updated.
 *
 * Each user also has a seperate (smaller) map attached to their User whilst they
 * have any watch entries, which is managed by class Extensible. When they add or remove
 * a watch entry from their list, it is inserted here, as well as the main list being
 * maintained. This map also contains the user's online status. For users that are
 * offline, the key points at an empty string, and for users that are online, the key
 * points at a string containing "users-ident users-host users-signon-time". This is
 * stored in this manner so that we don't have to FindUser() to fetch this info, the
 * users signon can populate the field for us.
 *
 * For example, going again on the example above, this would be w00t's watchlist:
 *
 * KEY: Boo    --->  Status: "Boo brains.sexy.babe 535342348"
 * KEY: Brain  --->  Status: ""
 *
 * In this list we can see that Boo is online, and Brain is offline. We can then
 * use this list for 'WATCH L', and 'WATCH S' can be implemented as a combination
 * of the above two data structures, with minimum CPU penalty for doing so.
 *
 * In short, the least efficient this ever gets is O(n), and thats only because
 * there are parts that *must* loop (e.g. telling all users that are watching a
 * nick that the user online), however this is a *major* improvement over the
 * 1.0 implementation, which in places had O(n^n) and worse in it, because this
 * implementation scales based upon the sizes of the watch entries, whereas the
 * old system would scale (or not as the case may be) according to the total number
 * of users using WATCH.
 */

/*
 * Before you start screaming, this definition is only used here, so moving it to a header is pointless.
 * Yes, it's horrid. Blame cl for being different. -- w00t
 */
#if defined(WINDOWS) && !defined(HASHMAP_DEPRECATED)
	typedef nspace::hash_map<irc::string, std::deque<User*>, nspace::hash_compare<irc::string, std::less<irc::string> > > watchentries;
#else
	typedef nspace::hash_map<irc::string, std::deque<User*>, nspace::hash<irc::string> > watchentries;
#endif
typedef std::map<irc::string, std::string> watchlist;

/* Who's watching each nickname.
 * NOTE: We do NOT iterate this to display a user's WATCH list!
 * See the comments above!
 */
watchentries* whos_watching_me;

class CommandSVSWatch : public Command
{
 public:
	CommandSVSWatch(Module* Creator) : Command(Creator,"SVSWATCH", 2)
	{
		syntax = "<target> [C|L|S]|[+|-<nick>]";
		TRANSLATE3(TR_NICK, TR_TEXT, TR_END); /* we watch for a nick. not a UID. */
	}

	CmdResult Handle (const std::vector<std::string> &parameters, User *user)
	{
		if (!ServerInstance->ULine(user->server))
			return CMD_FAILURE;

		User *u = ServerInstance->FindNick(parameters[0]);
		if (!u)
			return CMD_FAILURE;

		if (IS_LOCAL(u))
		{
			ServerInstance->Parser->CallHandler("WATCH", parameters, u);
		}

		return CMD_SUCCESS;
	}

	RouteDescriptor GetRouting(User* user, const std::vector<std::string>& parameters)
	{
		return ROUTE_BROADCAST;
	}
};

/** Handle /WATCH
 */
class CommandWatch : public Command
{
	unsigned int& MAX_WATCH;
 public:
	SimpleExtItem<watchlist> ext;
	CmdResult remove_watch(User* user, const char* nick)
	{
		// removing an item from the list
		if (!ServerInstance->IsNick(nick, ServerInstance->Config->Limits.NickMax))
		{
			user->WriteNumeric(942, "%s %s :Invalid nickname", user->nick.c_str(), nick);
			return CMD_FAILURE;
		}

		watchlist* wl = ext.get(user);
		if (wl)
		{
			/* Yup, is on my list */
			watchlist::iterator n = wl->find(nick);

			if (!wl)
				return CMD_FAILURE;

			if (n != wl->end())
			{
				if (!n->second.empty())
					user->WriteNumeric(602, "%s %s %s :stopped watching", user->nick.c_str(), n->first.c_str(), n->second.c_str());
				else
					user->WriteNumeric(602, "%s %s * * 0 :stopped watching", user->nick.c_str(), nick);

				wl->erase(n);
			}

			if (wl->empty())
			{
				ext.unset(user);
			}

			watchentries::iterator x = whos_watching_me->find(nick);
			if (x != whos_watching_me->end())
			{
				/* People are watching this user, am i one of them? */
				std::deque<User*>::iterator n2 = std::find(x->second.begin(), x->second.end(), user);
				if (n2 != x->second.end())
					/* I'm no longer watching you... */
					x->second.erase(n2);

				if (x->second.empty())
					/* nobody else is, either. */
					whos_watching_me->erase(nick);
			}
		}

		return CMD_SUCCESS;
	}

	CmdResult add_watch(User* user, const char* nick)
	{
		if (!ServerInstance->IsNick(nick, ServerInstance->Config->Limits.NickMax))
		{
			user->WriteNumeric(942, "%s %s :Invalid nickname",user->nick.c_str(),nick);
			return CMD_FAILURE;
		}

		watchlist* wl = ext.get(user);
		if (!wl)
		{
			wl = new watchlist();
			ext.set(user, wl);
		}

		if (wl->size() == MAX_WATCH)
		{
			user->WriteNumeric(512, "%s %s :Too many WATCH entries", user->nick.c_str(), nick);
			return CMD_FAILURE;
		}

		watchlist::iterator n = wl->find(nick);
		if (n == wl->end())
		{
			/* Don't already have the user on my watch list, proceed */
			watchentries::iterator x = whos_watching_me->find(nick);
			if (x != whos_watching_me->end())
			{
				/* People are watching this user, add myself */
				x->second.push_back(user);
			}
			else
			{
				std::deque<User*> newlist;
				newlist.push_back(user);
				(*(whos_watching_me))[nick] = newlist;
			}

			User* target = ServerInstance->FindNick(nick);
			if (target)
			{
				(*wl)[nick] = std::string(target->ident).append(" ").append(target->dhost).append(" ").append(ConvToStr(target->age));
				user->WriteNumeric(604, "%s %s %s :is online",user->nick.c_str(), nick, (*wl)[nick].c_str());
				if (IS_AWAY(target))
				{
					user->WriteNumeric(609, "%s %s %s %s %lu :is away", user->nick.c_str(), target->nick.c_str(), target->ident.c_str(), target->dhost.c_str(), (unsigned long) target->awaytime);
				}
			}
			else
			{
				(*wl)[nick] = "";
				user->WriteNumeric(605, "%s %s * * 0 :is offline",user->nick.c_str(), nick);
			}
		}

		return CMD_SUCCESS;
	}

	CommandWatch(Module* parent, unsigned int &maxwatch) : Command(parent,"WATCH", 0), MAX_WATCH(maxwatch), ext("watchlist", parent)
	{
		syntax = "[C|L|S]|[+|-<nick>]";
		TRANSLATE2(TR_TEXT, TR_END); /* we watch for a nick. not a UID. */
	}

	CmdResult Handle (const std::vector<std::string> &parameters, User *user)
	{
		if (parameters.empty())
		{
			watchlist* wl = ext.get(user);
			if (wl)
			{
				for (watchlist::iterator q = wl->begin(); q != wl->end(); q++)
				{
					if (!q->second.empty())
						user->WriteNumeric(604, "%s %s %s :is online", user->nick.c_str(), q->first.c_str(), q->second.c_str());
				}
			}
			user->WriteNumeric(607, "%s :End of WATCH list",user->nick.c_str());
		}
		else if (parameters.size() > 0)
		{
			for (int x = 0; x < (int)parameters.size(); x++)
			{
				const char *nick = parameters[x].c_str();
				if (!strcasecmp(nick,"C"))
				{
					// watch clear
					watchlist* wl = ext.get(user);
					if (wl)
					{
						for (watchlist::iterator i = wl->begin(); i != wl->end(); i++)
						{
							watchentries::iterator i2 = whos_watching_me->find(i->first);
							if (i2 != whos_watching_me->end())
							{
								/* People are watching this user, am i one of them? */
								std::deque<User*>::iterator n = std::find(i2->second.begin(), i2->second.end(), user);
								if (n != i2->second.end())
									/* I'm no longer watching you... */
									i2->second.erase(n);

								if (i2->second.empty())
									/* nobody else is, either. */
									whos_watching_me->erase(i2);
							}
						}

						ext.unset(user);
					}
				}
				else if (!strcasecmp(nick,"L"))
				{
					watchlist* wl = ext.get(user);
					if (wl)
					{
						for (watchlist::iterator q = wl->begin(); q != wl->end(); q++)
						{
							if (!q->second.empty())
							{
								user->WriteNumeric(604, "%s %s %s :is online", user->nick.c_str(), q->first.c_str(), q->second.c_str());
								User *targ = ServerInstance->FindNick(q->first.c_str());
								if (IS_AWAY(targ))
								{
									user->WriteNumeric(609, "%s %s %s %s %lu :is away", user->nick.c_str(), targ->nick.c_str(), targ->ident.c_str(), targ->dhost.c_str(), (unsigned long) targ->awaytime);
								}
							}
							else
								user->WriteNumeric(605, "%s %s * * 0 :is offline", user->nick.c_str(), q->first.c_str());
						}
					}
					user->WriteNumeric(607, "%s :End of WATCH list",user->nick.c_str());
				}
				else if (!strcasecmp(nick,"S"))
				{
					watchlist* wl = ext.get(user);
					int you_have = 0;
					int youre_on = 0;
					std::string list;

					if (wl)
					{
						for (watchlist::iterator q = wl->begin(); q != wl->end(); q++)
							list.append(q->first.c_str()).append(" ");
						you_have = wl->size();
					}

					watchentries::iterator i2 = whos_watching_me->find(user->nick.c_str());
					if (i2 != whos_watching_me->end())
						youre_on = i2->second.size();

					user->WriteNumeric(603, "%s :You have %d and are on %d WATCH entries", user->nick.c_str(), you_have, youre_on);
					user->WriteNumeric(606, "%s :%s",user->nick.c_str(), list.c_str());
					user->WriteNumeric(607, "%s :End of WATCH S",user->nick.c_str());
				}
				else if (nick[0] == '-')
				{
					nick++;
					remove_watch(user, nick);
				}
				else if (nick[0] == '+')
				{
					nick++;
					add_watch(user, nick);
				}
			}
		}
		return CMD_SUCCESS;
	}
};

class Modulewatch : public Module
{
	unsigned int maxwatch;
	CommandWatch cmdw;
	CommandSVSWatch sw;

 public:
	Modulewatch()
		: maxwatch(32), cmdw(this, maxwatch), sw(this) 
	{
		OnRehash(NULL);
		whos_watching_me = new watchentries();
		ServerInstance->AddCommand(&cmdw);
		ServerInstance->AddCommand(&sw);
		ServerInstance->Extensions.Register(&cmdw.ext);
		Implementation eventlist[] = { I_OnRehash, I_OnGarbageCollect, I_OnUserQuit, I_OnPostConnect, I_OnUserPostNick, I_On005Numeric, I_OnSetAway };
		ServerInstance->Modules->Attach(eventlist, this, 7);
	}

	virtual void OnRehash(User* user)
	{
		ConfigReader Conf;
		maxwatch = Conf.ReadInteger("watch", "maxentries", 0, true);
		if (!maxwatch)
			maxwatch = 32;
	}

	virtual ModResult OnSetAway(User *user, const std::string &awaymsg)
	{
		std::string numeric;
		int inum;

		if (awaymsg.empty())
		{
			numeric = std::string(user->nick) + " " + user->ident + " " + user->dhost + " " + ConvToStr(ServerInstance->Time()) + " :is no longer away";
			inum = 599;
		}
		else
		{
			numeric = std::string(user->nick) + " " + user->ident + " " + user->dhost + " " + ConvToStr(ServerInstance->Time()) + " :" + awaymsg;
			inum = 598;
		}

		watchentries::iterator x = whos_watching_me->find(user->nick.c_str());
		if (x != whos_watching_me->end())
		{
			for (std::deque<User*>::iterator n = x->second.begin(); n != x->second.end(); n++)
			{
				(*n)->WriteNumeric(inum, numeric);
			}
		}

		return MOD_RES_PASSTHRU;
	}

	virtual void OnUserQuit(User* user, const std::string &reason, const std::string &oper_message)
	{
		watchentries::iterator x = whos_watching_me->find(user->nick.c_str());
		if (x != whos_watching_me->end())
		{
			for (std::deque<User*>::iterator n = x->second.begin(); n != x->second.end(); n++)
			{
				(*n)->WriteNumeric(601, "%s %s %s %s %lu :went offline", (*n)->nick.c_str() ,user->nick.c_str(), user->ident.c_str(), user->dhost.c_str(), (unsigned long) ServerInstance->Time());

				watchlist* wl = cmdw.ext.get(*n);
				if (wl)
					/* We were on somebody's notify list, set ourselves offline */
					(*wl)[user->nick.c_str()] = "";
			}
		}

		/* Now im quitting, if i have a notify list, im no longer watching anyone */
		watchlist* wl = cmdw.ext.get(user);
		if (wl)
		{
			/* Iterate every user on my watch list, and take me out of the whos_watching_me map for each one we're watching */
			for (watchlist::iterator i = wl->begin(); i != wl->end(); i++)
			{
				watchentries::iterator i2 = whos_watching_me->find(i->first);
				if (i2 != whos_watching_me->end())
				{
						/* People are watching this user, am i one of them? */
						std::deque<User*>::iterator n = std::find(i2->second.begin(), i2->second.end(), user);
						if (n != i2->second.end())
							/* I'm no longer watching you... */
							i2->second.erase(n);

						if (i2->second.empty())
							/* and nobody else is, either. */
							whos_watching_me->erase(i2);
				}
			}
		}
	}

	virtual void OnGarbageCollect()
	{
		watchentries* old_watch = whos_watching_me;
		whos_watching_me = new watchentries();

		for (watchentries::const_iterator n = old_watch->begin(); n != old_watch->end(); n++)
			whos_watching_me->insert(*n);

		delete old_watch;
	}

	virtual void OnPostConnect(User* user)
	{
		watchentries::iterator x = whos_watching_me->find(user->nick.c_str());
		if (x != whos_watching_me->end())
		{
			for (std::deque<User*>::iterator n = x->second.begin(); n != x->second.end(); n++)
			{
				(*n)->WriteNumeric(600, "%s %s %s %s %lu :arrived online", (*n)->nick.c_str(), user->nick.c_str(), user->ident.c_str(), user->dhost.c_str(), (unsigned long) user->age);

				watchlist* wl = cmdw.ext.get(*n);
				if (wl)
					/* We were on somebody's notify list, set ourselves online */
					(*wl)[user->nick.c_str()] = std::string(user->ident).append(" ").append(user->dhost).append(" ").append(ConvToStr(user->age));
			}
		}
	}

	virtual void OnUserPostNick(User* user, const std::string &oldnick)
	{
		watchentries::iterator new_offline = whos_watching_me->find(oldnick.c_str());
		watchentries::iterator new_online = whos_watching_me->find(user->nick.c_str());

		if (new_offline != whos_watching_me->end())
		{
			for (std::deque<User*>::iterator n = new_offline->second.begin(); n != new_offline->second.end(); n++)
			{
				watchlist* wl = cmdw.ext.get(*n);
				if (wl)
				{
					(*n)->WriteNumeric(601, "%s %s %s %s %lu :went offline", (*n)->nick.c_str(), oldnick.c_str(), user->ident.c_str(), user->dhost.c_str(), (unsigned long) user->age);
					(*wl)[oldnick.c_str()] = "";
				}
			}
		}

		if (new_online != whos_watching_me->end())
		{
			for (std::deque<User*>::iterator n = new_online->second.begin(); n != new_online->second.end(); n++)
			{
				watchlist* wl = cmdw.ext.get(*n);
				if (wl)
				{
					(*wl)[user->nick.c_str()] = std::string(user->ident).append(" ").append(user->dhost).append(" ").append(ConvToStr(user->age));
					(*n)->WriteNumeric(600, "%s %s %s :arrived online", (*n)->nick.c_str(), user->nick.c_str(), (*wl)[user->nick.c_str()].c_str());
				}
			}
		}
	}

	virtual void On005Numeric(std::string &output)
	{
		// we don't really have a limit...
		output = output + " WATCH=" + ConvToStr(maxwatch);
	}

	virtual ~Modulewatch()
	{
		delete whos_watching_me;
	}

	virtual Version GetVersion()
	{
		return Version("Provides support for the /WATCH command", VF_COMMON | VF_VENDOR, API_VERSION);
	}
};

MODULE_INIT(Modulewatch)