src/modules/m_watch.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15
  16 /* $ModDesc: Provides support for the /WATCH command */
  17
  18 /* This module has been refactored to provide a very efficient (in terms of cpu time)
  19  * implementation of /WATCH.
  20  *
  21  * To improve the efficiency of watch, many lists are kept. The first primary list is
  22  * a hash_map of who's being watched by who. For example:
  23  *
  24  * KEY: Brain   --->  Watched by:  Boo, w00t, Om
  25  * KEY: Boo     --->  Watched by:  Brain, w00t
  26  *
  27  * This is used when we want to tell all the users that are watching someone that
  28  * they are now available or no longer available. For example, if the hash was
  29  * populated as shown above, then when Brain signs on, messages are sent to Boo, w00t
  30  * and Om by reading their 'watched by' list. When this occurs, their online status
  31  * in each of these users lists (see below) is also updated.
  32  *
  33  * Each user also has a seperate (smaller) map attached to their userrec whilst they
  34  * have any watch entries, which is managed by class Extensible. When they add or remove
  35  * a watch entry from their list, it is inserted here, as well as the main list being
  36  * maintained. This map also contains the user's online status. For users that are
  37  * offline, the key points at an empty string, and for users that are online, the key
  38  * points at a string containing "users-ident users-host users-signon-time". This is
  39  * stored in this manner so that we don't have to FindUser() to fetch this info, the
  40  * users signon can populate the field for us.
  41  *
  42  * For example, going again on the example above, this would be w00t's watchlist:
  43  *
  44  * KEY: Boo    --->  Status: "Boo brains.sexy.babe 535342348"
  45  * KEY: Brain  --->  Status: ""
  46  *
  47  * In this list we can see that Boo is online, and Brain is offline. We can then
  48  * use this list for 'WATCH L', and 'WATCH S' can be implemented as a combination
  49  * of the above two data structures, with minimum CPU penalty for doing so.
  50  *
  51  * In short, the least efficient this ever gets is O(n), and thats only because
  52  * there are parts that *must* loop (e.g. telling all users that are watching a
  53  * nick that the user online), however this is a *major* improvement over the
  54  * 1.0 implementation, which in places had O(n^n) and worse in it, because this
  55  * implementation scales based upon the sizes of the watch entries, whereas the
  56  * old system would scale (or not as the case may be) according to the total number
  57  * of users using WATCH.
  58  */
  59
  60 /*
  61  * Before you start screaming, this definition is only used here, so moving it to a header is pointless.
  62  * Yes, it's horrid. Blame cl for being different. -- w00t
  63  */
  64 #ifdef WINDOWS
  65 typedef nspace::hash_map<irc::string, std::deque<userrec*>, nspace::hash_compare<irc::string, less<irc::string> > > watchentries;
  66 #else
  67 typedef nspace::hash_map<irc::string, std::deque<userrec*>, nspace::hash<irc::string> > watchentries;
  68 #endif
  69 typedef std::map<irc::string, std::string> watchlist;
  70
  71 /* Who's watching each nickname.
  72  * NOTE: We do NOT iterate this to display a user's WATCH list!
  73  * See the comments above!
  74  */
  75 watchentries* whos_watching_me;
  76
  77 /** Handle /WATCH
  78  */
  79 class cmd_watch : public command_t
  80 {
  81         unsigned int& MAX_WATCH;
  82  public:
  83         CmdResult remove_watch(userrec* user, const char* nick)
  84         {
  85                 // removing an item from the list
  86                 if (!ServerInstance->IsNick(nick))
  87                 {
  88                         user->WriteServ("942 %s %s :Invalid nickname", user->nick, nick);
  89                         return CMD_FAILURE;
  90                 }
  91
  92                 watchlist* wl;
  93                 if (user->GetExt("watchlist", wl))
  94                 {
  95                         /* Yup, is on my list */
  96                         watchlist::iterator n = wl->find(nick);
  97                         if (n != wl->end())
  98                         {
  99                                 if (!n->second.empty())
 100                                         user->WriteServ("602 %s %s %s :stopped watching", user->nick, n->first.c_str(), n->second.c_str());
 101                                 else
 102                                         user->WriteServ("602 %s %s * * 0 :stopped watching", user->nick, nick);
 103
 104                                 wl->erase(n);
 105                         }
 106
 107                         if (!wl->size())
 108                         {
 109                                 user->Shrink("watchlist");
 110                                 delete wl;
 111                         }
 112
 113                         watchentries::iterator x = whos_watching_me->find(nick);
 114                         if (x != whos_watching_me->end())
 115                         {
 116                                 /* People are watching this user, am i one of them? */
 117                                 std::deque<userrec*>::iterator n = std::find(x->second.begin(), x->second.end(), user);
 118                                 if (n != x->second.end())
 119                                         /* I'm no longer watching you... */
 120                                         x->second.erase(n);
 121
 122                                 if (!x->second.size())
 123                                         whos_watching_me->erase(nick);
 124                         }
 125                 }
 126
 127                 /* This might seem confusing, but we return CMD_FAILURE
 128                  * to indicate that this message shouldnt be routed across
 129                  * the network to other linked servers.
 130                  */
 131                 return CMD_FAILURE;
 132         }
 133
 134         CmdResult add_watch(userrec* user, const char* nick)
 135         {
 136                 if (!ServerInstance->IsNick(nick))
 137                 {
 138                         user->WriteServ("942 %s %s :Invalid nickname",user->nick,nick);
 139                         return CMD_FAILURE;
 140                 }
 141
 142                 watchlist* wl;
 143                 if (!user->GetExt("watchlist", wl))
 144                 {
 145                         wl = new watchlist();
 146                         user->Extend("watchlist", wl);
 147                 }
 148
 149                 if (wl->size() == MAX_WATCH)
 150                 {
 151                         user->WriteServ("512 %s %s :Too many WATCH entries", user->nick, nick);
 152                         return CMD_FAILURE;
 153                 }
 154
 155                 watchlist::iterator n = wl->find(nick);
 156                 if (n == wl->end())
 157                 {
 158                         /* Don't already have the user on my watch list, proceed */
 159                         watchentries::iterator x = whos_watching_me->find(nick);
 160                         if (x != whos_watching_me->end())
 161                         {
 162                                 /* People are watching this user, add myself */
 163                                 x->second.push_back(user);
 164                         }
 165                         else
 166                         {
 167                                 std::deque<userrec*> newlist;
 168                                 newlist.push_back(user);
 169                                 (*(whos_watching_me))[nick] = newlist;
 170                         }
 171
 172                         userrec* target = ServerInstance->FindNick(nick);
 173                         if (target)
 174                         {
 175                                 if (target->Visibility && !target->Visibility->VisibleTo(user))
 176                                 {
 177                                         (*wl)[nick] = "";
 178                                         user->WriteServ("605 %s %s * * 0 :is offline",user->nick, nick);
 179                                         return CMD_FAILURE;
 180                                 }
 181
 182                                 (*wl)[nick] = std::string(target->ident).append(" ").append(target->dhost).append(" ").append(ConvToStr(target->age));
 183                                 user->WriteServ("604 %s %s %s :is online",user->nick, nick, (*wl)[nick].c_str());
 184                         }
 185                         else
 186                         {
 187                                 (*wl)[nick] = "";
 188                                 user->WriteServ("605 %s %s * * 0 :is offline",user->nick, nick);
 189                         }
 190                 }
 191
 192                 return CMD_FAILURE;
 193         }
 194
 195         cmd_watch (InspIRCd* Instance, unsigned int &maxwatch) : command_t(Instance,"WATCH",0,0), MAX_WATCH(maxwatch)
 196         {
 197                 this->source = "m_watch.so";
 198                 syntax = "[C|L|S]|[+|-<nick>]";
 199                 TRANSLATE2(TR_TEXT, TR_END); /* we watch for a nick. not a UID. */
 200         }
 201
 202         CmdResult Handle (const char** parameters, int pcnt, userrec *user)
 203         {
 204                 if (!pcnt)
 205                 {
 206                         watchlist* wl;
 207                         if (user->GetExt("watchlist", wl))
 208                         {
 209                                 for (watchlist::iterator q = wl->begin(); q != wl->end(); q++)
 210                                 {
 211                                         if (!q->second.empty())
 212                                                 user->WriteServ("604 %s %s %s :is online", user->nick, q->first.c_str(), q->second.c_str());
 213                                 }
 214                         }
 215                         user->WriteServ("607 %s :End of WATCH list",user->nick);
 216                 }
 217                 else if (pcnt > 0)
 218                 {
 219                         for (int x = 0; x < pcnt; x++)
 220                         {
 221                                 const char *nick = parameters[x];
 222                                 if (!strcasecmp(nick,"C"))
 223                                 {
 224                                         // watch clear
 225                                         watchlist* wl;
 226                                         if (user->GetExt("watchlist", wl))
 227                                         {
 228                                                 for (watchlist::iterator i = wl->begin(); i != wl->end(); i++)
 229                                                 {
 230                                                         watchentries::iterator x = whos_watching_me->find(i->first);
 231                                                         if (x != whos_watching_me->end())
 232                                                         {
 233                                                                 /* People are watching this user, am i one of them? */
 234                                                                 std::deque<userrec*>::iterator n = std::find(x->second.begin(), x->second.end(), user);
 235                                                                 if (n != x->second.end())
 236                                                                         /* I'm no longer watching you... */
 237                                                                         x->second.erase(n);
 238
 239                                                                 if (!x->second.size())
 240                                                                         whos_watching_me->erase(user->nick);
 241                                                         }
 242                                                 }
 243
 244                                                 delete wl;
 245                                                 user->Shrink("watchlist");
 246                                         }
 247                                 }
 248                                 else if (!strcasecmp(nick,"L"))
 249                                 {
 250                                         watchlist* wl;
 251                                         if (user->GetExt("watchlist", wl))
 252                                         {
 253                                                 for (watchlist::iterator q = wl->begin(); q != wl->end(); q++)
 254                                                 {
 255                                                         if (!q->second.empty())
 256                                                                 user->WriteServ("604 %s %s %s :is online", user->nick, q->first.c_str(), q->second.c_str());
 257                                                         else
 258                                                                 user->WriteServ("605 %s %s * * 0 :is offline", user->nick, q->first.c_str());
 259                                                 }
 260                                         }
 261                                         user->WriteServ("607 %s :End of WATCH list",user->nick);
 262                                 }
 263                                 else if (!strcasecmp(nick,"S"))
 264                                 {
 265                                         watchlist* wl;
 266                                         int you_have = 0;
 267                                         int youre_on = 0;
 268                                         std::string list;
 269
 270                                         if (user->GetExt("watchlist", wl))
 271                                         {
 272                                                 for (watchlist::iterator q = wl->begin(); q != wl->end(); q++)
 273                                                         list.append(q->first.c_str()).append(" ");
 274                                                 you_have = wl->size();
 275                                         }
 276
 277                                         watchentries::iterator x = whos_watching_me->find(user->nick);
 278                                         if (x != whos_watching_me->end())
 279                                                 youre_on = x->second.size();
 280
 281                                         user->WriteServ("603 %s :You have %d and are on %d WATCH entries", user->nick, you_have, youre_on);
 282                                         user->WriteServ("606 %s :%s",user->nick, list.c_str());
 283                                         user->WriteServ("607 %s :End of WATCH S",user->nick);
 284                                 }
 285                                 else if (nick[0] == '-')
 286                                 {
 287                                         nick++;
 288                                         remove_watch(user, nick);
 289                                 }
 290                                 else if (nick[0] == '+')
 291                                 {
 292                                         nick++;
 293                                         add_watch(user, nick);
 294                                 }
 295                         }
 296                 }
 297                 /* So that spanningtree doesnt pass the WATCH commands to the network! */
 298                 return CMD_FAILURE;
 299         }
 300 };
 301
 302 class Modulewatch : public Module
 303 {
 304         cmd_watch* mycommand;
 305         unsigned int maxwatch;
 306  public:
 307
 308         Modulewatch(InspIRCd* Me)
 309                 : Module(Me), maxwatch(32)
 310         {
 311                 OnRehash(NULL, "");
 312                 whos_watching_me = new watchentries();
 313                 mycommand = new cmd_watch(ServerInstance, maxwatch);
 314                 ServerInstance->AddCommand(mycommand);
 315         }
 316
 317         virtual void OnRehash(userrec* user, const std::string &parameter)
 318         {
 319                 ConfigReader Conf(ServerInstance);
 320                 maxwatch = Conf.ReadInteger("watch", "maxentries", 0, true);
 321                 if (!maxwatch)
 322                         maxwatch = 32;
 323         }
 324
 325         void Implements(char* List)
 326         {
 327                 List[I_OnRehash] = List[I_OnGarbageCollect] = List[I_OnCleanup] = List[I_OnUserQuit] = List[I_OnPostConnect] = List[I_OnUserPostNick] = List[I_On005Numeric] = 1;
 328         }
 329
 330         virtual void OnUserQuit(userrec* user, const std::string &reason, const std::string &oper_message)
 331         {
 332                 watchentries::iterator x = whos_watching_me->find(user->nick);
 333                 if (x != whos_watching_me->end())
 334                 {
 335                         for (std::deque<userrec*>::iterator n = x->second.begin(); n != x->second.end(); n++)
 336                         {
 337                                 if (!user->Visibility || user->Visibility->VisibleTo(user))
 338                                         (*n)->WriteServ("601 %s %s %s %s %lu :went offline", (*n)->nick ,user->nick, user->ident, user->dhost, ServerInstance->Time());
 339
 340                                 watchlist* wl;
 341                                 if ((*n)->GetExt("watchlist", wl))
 342                                         /* We were on somebody's notify list, set ourselves offline */
 343                                         (*wl)[user->nick] = "";
 344                         }
 345                 }
 346
 347                 /* Now im quitting, if i have a notify list, im no longer watching anyone */
 348                 watchlist* wl;
 349                 if (user->GetExt("watchlist", wl))
 350                 {
 351                         /* Iterate every user on my watch list, and take me out of the whos_watching_me map for each one we're watching */
 352                         for (watchlist::iterator i = wl->begin(); i != wl->end(); i++)
 353                         {
 354                                 watchentries::iterator x = whos_watching_me->find(i->first);
 355                                 if (x != whos_watching_me->end())
 356                                 {
 357                                                 /* People are watching this user, am i one of them? */
 358                                                 std::deque<userrec*>::iterator n = std::find(x->second.begin(), x->second.end(), user);
 359                                                 if (n != x->second.end())
 360                                                         /* I'm no longer watching you... */
 361                                                         x->second.erase(n);
 362
 363                                                 if (!x->second.size())
 364                                                         whos_watching_me->erase(user->nick);
 365                                 }
 366                         }
 367
 368                         /* User's quitting, we're done with this. */
 369                         delete wl;
 370                 }
 371         }
 372
 373         virtual void OnGarbageCollect()
 374         {
 375                 watchentries* old_watch = whos_watching_me;
 376                 whos_watching_me = new watchentries();
 377
 378                 for (watchentries::const_iterator n = old_watch->begin(); n != old_watch->end(); n++)
 379                         whos_watching_me->insert(*n);
 380
 381                 delete old_watch;
 382         }
 383
 384         virtual void OnCleanup(int target_type, void* item)
 385         {
 386                 if (target_type == TYPE_USER)
 387                 {
 388                         watchlist* wl;
 389                         userrec* user = (userrec*)item;
 390
 391                         if (user->GetExt("watchlist", wl))
 392                         {
 393                                 user->Shrink("watchlist");
 394                                 delete wl;
 395                         }
 396                 }
 397         }
 398
 399         virtual void OnPostConnect(userrec* user)
 400         {
 401                 watchentries::iterator x = whos_watching_me->find(user->nick);
 402                 if (x != whos_watching_me->end())
 403                 {
 404                         for (std::deque<userrec*>::iterator n = x->second.begin(); n != x->second.end(); n++)
 405                         {
 406                                 if (!user->Visibility || user->Visibility->VisibleTo(user))
 407                                         (*n)->WriteServ("600 %s %s %s %s %lu :arrived online", (*n)->nick, user->nick, user->ident, user->dhost, user->age);
 408
 409                                 watchlist* wl;
 410                                 if ((*n)->GetExt("watchlist", wl))
 411                                         /* We were on somebody's notify list, set ourselves online */
 412                                         (*wl)[user->nick] = std::string(user->ident).append(" ").append(user->dhost).append(" ").append(ConvToStr(user->age));
 413                         }
 414                 }
 415         }
 416
 417         virtual void OnUserPostNick(userrec* user, const std::string &oldnick)
 418         {
 419                 watchentries::iterator new_offline = whos_watching_me->find(assign(oldnick));
 420                 watchentries::iterator new_online = whos_watching_me->find(user->nick);
 421
 422                 if (new_offline != whos_watching_me->end())
 423                 {
 424                         for (std::deque<userrec*>::iterator n = new_offline->second.begin(); n != new_offline->second.end(); n++)
 425                         {
 426                                 watchlist* wl;
 427                                 if ((*n)->GetExt("watchlist", wl))
 428                                 {
 429                                         if (!user->Visibility || user->Visibility->VisibleTo(user))
 430                                                 (*n)->WriteServ("601 %s %s %s %s %lu :went offline", (*n)->nick, oldnick.c_str(), user->ident, user->dhost, user->age);
 431                                         (*wl)[oldnick.c_str()] = "";
 432                                 }
 433                         }
 434                 }
 435
 436                 if (new_online != whos_watching_me->end())
 437                 {
 438                         for (std::deque<userrec*>::iterator n = new_online->second.begin(); n != new_online->second.end(); n++)
 439                         {
 440                                 watchlist* wl;
 441                                 if ((*n)->GetExt("watchlist", wl))
 442                                 {
 443                                         (*wl)[user->nick] = std::string(user->ident).append(" ").append(user->dhost).append(" ").append(ConvToStr(user->age));
 444                                         if (!user->Visibility || user->Visibility->VisibleTo(user))
 445                                                 (*n)->WriteServ("600 %s %s %s :arrived online", (*n)->nick, user->nick, (*wl)[user->nick].c_str());
 446                                 }
 447                         }
 448                 }
 449         }
 450
 451         virtual void On005Numeric(std::string &output)
 452         {
 453                 // we don't really have a limit...
 454                 output = output + " WATCH=" + ConvToStr(maxwatch);
 455         }
 456
 457         virtual ~Modulewatch()
 458         {
 459                 delete whos_watching_me;
 460         }
 461
 462         virtual Version GetVersion()
 463         {
 464                 return Version(1, 1, 0, 0, VF_COMMON | VF_VENDOR, API_VERSION);
 465         }
 466 };
 467
 468 MODULE_INIT(Modulewatch)
 469