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