src/experimentation/gnunet-daemon-experimentation_nodes.c

   1 /*
   2      This file is part of GNUnet.
   3      (C) 2009 Christian Grothoff (and other contributing authors)
   4
   5      GNUnet is free software; you can redistribute it and/or modify
   6      it under the terms of the GNU General Public License as published
   7      by the Free Software Foundation; either version 3, or (at your
   8      option) any later version.
   9
  10      GNUnet is distributed in the hope that it will be useful, but
  11      WITHOUT ANY WARRANTY; without even the implied warranty of
  12      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13      General Public License for more details.
  14
  15      You should have received a copy of the GNU General Public License
  16      along with GNUnet; see the file COPYING.  If not, write to the
  17      Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18      Boston, MA 02111-1307, USA.
  19 */
  20
  21 /**
  22  * @file experimentation/gnunet-daemon-experimentation_nodes.c
  23  * @brief experimentation daemon: node management
  24  * @author Christian Grothoff
  25  * @author Matthias Wachs
  26  */
  27 #include "platform.h"
  28 #include "gnunet_getopt_lib.h"
  29 #include "gnunet_util_lib.h"
  30 #include "gnunet_core_service.h"
  31 #include "gnunet_statistics_service.h"
  32 #include "gnunet-daemon-experimentation.h"
  33
  34 static struct GNUNET_CORE_Handle *ch;
  35
  36 static struct GNUNET_PeerIdentity me;
  37
  38 /**
  39  * Nodes with a pending request
  40  */
  41
  42 struct GNUNET_CONTAINER_MultiHashMap *nodes_requested;
  43
  44 /**
  45  * Active experimentation nodes
  46  */
  47 struct GNUNET_CONTAINER_MultiHashMap *nodes_active;
  48
  49 /**
  50  * Inactive experimentation nodes
  51  * To be excluded from future requests
  52  */
  53 struct GNUNET_CONTAINER_MultiHashMap *nodes_inactive;
  54
  55
  56 static void update_stats (struct GNUNET_CONTAINER_MultiHashMap *m)
  57 {
  58         GNUNET_assert (NULL != m);
  59         GNUNET_assert (NULL != GSE_stats);
  60
  61         if (m == nodes_active)
  62         {
  63                         GNUNET_STATISTICS_set (GSE_stats, "# nodes active",
  64                                         GNUNET_CONTAINER_multihashmap_size(m), GNUNET_NO);
  65         }
  66         else if (m == nodes_inactive)
  67         {
  68                         GNUNET_STATISTICS_set (GSE_stats, "# nodes inactive",
  69                                         GNUNET_CONTAINER_multihashmap_size(m), GNUNET_NO);
  70         }
  71         else if (m == nodes_requested)
  72         {
  73                         GNUNET_STATISTICS_set (GSE_stats, "# nodes requested",
  74                                         GNUNET_CONTAINER_multihashmap_size(m), GNUNET_NO);
  75         }
  76         else
  77                 GNUNET_break (0);
  78
  79 }
  80
  81 static int
  82 cleanup_nodes (void *cls,
  83                                                          const struct GNUNET_HashCode * key,
  84                                                          void *value)
  85 {
  86         struct Node *n;
  87         struct GNUNET_CONTAINER_MultiHashMap *cur = cls;
  88
  89         n = value;
  90         if (GNUNET_SCHEDULER_NO_TASK != n->timeout_task)
  91         {
  92                 GNUNET_SCHEDULER_cancel (n->timeout_task);
  93                 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
  94         }
  95         if (NULL != n->cth)
  96         {
  97                 GNUNET_CORE_notify_transmit_ready_cancel (n->cth);
  98                 n->cth = NULL;
  99         }
 100
 101
 102         GNUNET_CONTAINER_multihashmap_remove (cur, key, value);
 103         GNUNET_free (value);
 104         return GNUNET_OK;
 105 }
 106
 107
 108 static int is_me (const struct GNUNET_PeerIdentity *id)
 109 {
 110         if (0 == memcmp (&me, id, sizeof (me)))
 111                 return GNUNET_YES;
 112         else
 113                 return GNUNET_NO;
 114 }
 115
 116 static void
 117 core_startup_handler (void *cls,
 118                                                                                         struct GNUNET_CORE_Handle * server,
 119                       const struct GNUNET_PeerIdentity *my_identity)
 120 {
 121         me = *my_identity;
 122 }
 123
 124 static void
 125 remove_request (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
 126 {
 127         struct Node *n = cls;
 128
 129         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Removing request for peer %s due to timeout\n"),
 130                         GNUNET_i2s (&n->id));
 131
 132         if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains (nodes_requested, &n->id.hashPubKey))
 133         {
 134                         GNUNET_CONTAINER_multihashmap_remove (nodes_requested, &n->id.hashPubKey, n);
 135                         update_stats (nodes_requested);
 136                         GNUNET_CONTAINER_multihashmap_put (nodes_inactive, &n->id.hashPubKey, n,
 137                                         GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
 138                         update_stats (nodes_inactive);
 139         }
 140
 141         n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
 142         if (NULL != n->cth)
 143         {
 144                 GNUNET_CORE_notify_transmit_ready_cancel (n->cth);
 145                 n->cth = NULL;
 146         }
 147 }
 148
 149 size_t send_request_cb (void *cls, size_t bufsize, void *buf)
 150 {
 151         struct Node *n = cls;
 152         struct Experimentation_Request msg;
 153         size_t size = sizeof (msg);
 154
 155         n->cth = NULL;
 156   if (buf == NULL)
 157   {
 158     /* client disconnected */
 159     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Client disconnected\n");
 160     if (GNUNET_SCHEDULER_NO_TASK != n->timeout_task)
 161                 GNUNET_SCHEDULER_cancel (n->timeout_task);
 162     GNUNET_SCHEDULER_add_now (&remove_request, n);
 163     return 0;
 164   }
 165   GNUNET_assert (bufsize >= size);
 166
 167         msg.msg.size = htons (size);
 168         msg.msg.type = htons (GNUNET_MESSAGE_TYPE_EXPERIMENTATION_REQUEST);
 169         msg.capabilities = htonl (GSE_node_capabilities);
 170         memcpy (buf, &msg, size);
 171
 172         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Sending request to peer %s\n"),
 173                         GNUNET_i2s (&n->id));
 174         return size;
 175 }
 176
 177 static void send_request (const struct GNUNET_PeerIdentity *peer)
 178 {
 179         struct Node *n;
 180         size_t size;
 181
 182         size = sizeof (struct Experimentation_Request);
 183         n = GNUNET_malloc (sizeof (struct Node));
 184         n->id = *peer;
 185         n->timeout_task = GNUNET_SCHEDULER_add_delayed (EXP_RESPONSE_TIMEOUT, &remove_request, n);
 186         n->cth = GNUNET_CORE_notify_transmit_ready(ch, GNUNET_NO, 0,
 187                                                                 GNUNET_TIME_relative_get_forever_(),
 188                                                                 peer, size, send_request_cb, n);
 189         n->capabilities = NONE;
 190
 191         GNUNET_assert (GNUNET_OK == GNUNET_CONTAINER_multihashmap_put (nodes_requested,
 192                         &peer->hashPubKey, n, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
 193
 194         update_stats (nodes_requested);
 195 }
 196
 197 size_t send_response_cb (void *cls, size_t bufsize, void *buf)
 198 {
 199         struct Node *n = cls;
 200         struct Experimentation_Response msg;
 201         size_t size = sizeof (msg);
 202
 203         n->cth = NULL;
 204   if (buf == NULL)
 205   {
 206     /* client disconnected */
 207     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Client disconnected\n");
 208     return 0;
 209   }
 210   GNUNET_assert (bufsize >= size);
 211
 212         msg.msg.size = htons (size);
 213         msg.msg.type = htons (GNUNET_MESSAGE_TYPE_EXPERIMENTATION_RESPONSE);
 214         msg.capabilities = htonl (GSE_node_capabilities);
 215         memcpy (buf, &msg, size);
 216
 217         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Sending response to peer %s\n"),
 218                         GNUNET_i2s (&n->id));
 219         return size;
 220 }
 221
 222 static void node_make_active (struct Node *n)
 223 {
 224   GNUNET_CONTAINER_multihashmap_put (nodes_active,
 225                         &n->id.hashPubKey, n, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
 226         update_stats (nodes_active);
 227         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Added peer `%s' as active node\n"),
 228                         GNUNET_i2s (&n->id));
 229 }
 230
 231
 232 static void handle_request (const struct GNUNET_PeerIdentity *peer,
 233                                                                                                                 const struct GNUNET_MessageHeader *message)
 234 {
 235         struct Node *n;
 236         struct Experimentation_Request *rm = (struct Experimentation_Request *) message;
 237
 238         if (NULL != (n = GNUNET_CONTAINER_multihashmap_get (nodes_active, &peer->hashPubKey)))
 239         {
 240                         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Received %s from %s peer `%s'\n"),
 241                                         "REQUEST", "active", GNUNET_i2s (peer));
 242                         n->capabilities = ntohl (rm->capabilities);
 243         }
 244         else if (NULL != (n = GNUNET_CONTAINER_multihashmap_get (nodes_requested, &peer->hashPubKey)))
 245         {
 246                         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Received %s from %s peer `%s'\n"),
 247                                         "REQUEST", "requested", GNUNET_i2s (peer));
 248                         n->capabilities = ntohl (rm->capabilities);
 249                         GNUNET_CONTAINER_multihashmap_remove (nodes_requested, &peer->hashPubKey, n);
 250                         if (GNUNET_SCHEDULER_NO_TASK != n->timeout_task)
 251                         {
 252                                 GNUNET_SCHEDULER_cancel (n->timeout_task);
 253                                 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
 254                         }
 255                         if (NULL != n->cth)
 256                         {
 257                                 GNUNET_CORE_notify_transmit_ready_cancel (n->cth);
 258                                 n->cth = NULL;
 259                         }
 260                         update_stats (nodes_requested);
 261                         node_make_active (n);
 262         }
 263         else if (NULL != (n = GNUNET_CONTAINER_multihashmap_get (nodes_inactive, &peer->hashPubKey)))
 264         {
 265                         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Received %s from %s peer `%s'\n"),
 266                                         "REQUEST", "inactive", GNUNET_i2s (peer));
 267                         n->capabilities = ntohl (rm->capabilities);
 268                         GNUNET_CONTAINER_multihashmap_remove (nodes_inactive, &peer->hashPubKey, n);
 269                         update_stats (nodes_inactive);
 270                         node_make_active (n);
 271         }
 272         else
 273         {
 274                         /* Create new node */
 275                         n = GNUNET_malloc (sizeof (struct Node));
 276                         n->id = *peer;
 277                         n->capabilities = NONE;
 278                         n->capabilities = ntohl (rm->capabilities);
 279                         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Received %s from %s peer `%s'\n"),
 280                                         "REQUEST", "new", GNUNET_i2s (peer));
 281                         node_make_active (n);
 282         }
 283         n->cth = GNUNET_CORE_notify_transmit_ready (ch, GNUNET_NO, 0,
 284                                                                 GNUNET_TIME_relative_get_forever_(),
 285                                                                 peer, sizeof (struct Experimentation_Response),
 286                                                                 send_response_cb, n);
 287 }
 288
 289 static void handle_response (const struct GNUNET_PeerIdentity *peer,
 290                                                                                                                  const struct GNUNET_MessageHeader *message)
 291 {
 292         struct Node *n;
 293         struct Experimentation_Request *rm = (struct Experimentation_Request *) message;
 294
 295         if (NULL != (n = GNUNET_CONTAINER_multihashmap_get (nodes_active, &peer->hashPubKey)))
 296         {
 297                         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Received %s from %s peer `%s'\n"),
 298                                         "RESPONSE", "active", GNUNET_i2s (peer));
 299                         n->capabilities = ntohl (rm->capabilities);
 300         }
 301         else if (NULL != (n = GNUNET_CONTAINER_multihashmap_get (nodes_requested, &peer->hashPubKey)))
 302         {
 303                         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Received %s from %s peer `%s'\n"),
 304                                         "RESPONSE", "requested", GNUNET_i2s (peer));
 305                         n->capabilities = ntohl (rm->capabilities);
 306                         GNUNET_CONTAINER_multihashmap_remove (nodes_requested, &peer->hashPubKey, n);
 307                         if (GNUNET_SCHEDULER_NO_TASK != n->timeout_task)
 308                         {
 309                                 GNUNET_SCHEDULER_cancel (n->timeout_task);
 310                                 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
 311                         }
 312                         if (NULL != n->cth)
 313                         {
 314                                 GNUNET_CORE_notify_transmit_ready_cancel (n->cth);
 315                                 n->cth = NULL;
 316                         }
 317                         update_stats (nodes_requested);
 318                         node_make_active (n);
 319         }
 320         else if (NULL != (n = GNUNET_CONTAINER_multihashmap_get (nodes_inactive, &peer->hashPubKey)))
 321         {
 322                         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Received %s from peer `%s'\n"),
 323                                         "RESPONSE", "inactive", GNUNET_i2s (peer));
 324                         n->capabilities = ntohl (rm->capabilities);
 325                         GNUNET_CONTAINER_multihashmap_remove (nodes_inactive, &peer->hashPubKey, n);
 326                         update_stats (nodes_inactive);
 327                         node_make_active (n);
 328         }
 329         else
 330         {
 331                         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Received %s from %s peer `%s'\n"),
 332                                         "RESPONSE", "unknown", GNUNET_i2s (peer));
 333                         return;
 334         }
 335 }
 336
 337 /**
 338  * Method called whenever a given peer connects.
 339  *
 340  * @param cls closure
 341  * @param peer peer identity this notification is about
 342  */
 343 void core_connect_handler (void *cls,
 344                            const struct GNUNET_PeerIdentity *peer)
 345 {
 346         if (GNUNET_YES == is_me(peer))
 347                 return;
 348
 349         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Connected to peer %s\n"),
 350                         GNUNET_i2s (peer));
 351
 352         if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains (nodes_requested, &peer->hashPubKey))
 353                 return; /* We already sent a request */
 354
 355         if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains (nodes_active, &peer->hashPubKey))
 356                 return; /* This peer is known as active  */
 357
 358         if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains (nodes_inactive, &peer->hashPubKey))
 359                 return; /* This peer is known as inactive  */
 360
 361         send_request (peer);
 362
 363 }
 364
 365
 366 /**
 367  * Method called whenever a given peer disconnects.
 368  *
 369  * @param cls closure
 370  * @param peer peer identity this notification is about
 371  */
 372 void core_disconnect_handler (void *cls,
 373                            const struct GNUNET_PeerIdentity * peer)
 374 {
 375         if (GNUNET_YES == is_me(peer))
 376                 return;
 377
 378         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Disconnected from peer %s\n"),
 379                         GNUNET_i2s (peer));
 380
 381 }
 382
 383
 384 static int
 385 core_receive_handler (void *cls,
 386                                                                                         const struct GNUNET_PeerIdentity *other,
 387                                                                                         const struct GNUNET_MessageHeader *message)
 388 {
 389         if (ntohs (message->size) < sizeof (struct GNUNET_MessageHeader))
 390         {
 391                         GNUNET_break (0);
 392                         return GNUNET_SYSERR;
 393         }
 394
 395         switch (ntohs (message->type)) {
 396                 case GNUNET_MESSAGE_TYPE_EXPERIMENTATION_REQUEST:
 397                         handle_request (other, message);
 398                         break;
 399                 case GNUNET_MESSAGE_TYPE_EXPERIMENTATION_RESPONSE:
 400                         handle_response (other, message);
 401                         break;
 402                 default:
 403                         break;
 404         }
 405
 406         return GNUNET_OK;
 407 }
 408
 409
 410
 411 /**
 412  * Start the nodes management
 413  *
 414  * @param cfg configuration handle
 415  */
 416 void
 417 GNUNET_EXPERIMENTATION_nodes_start ()
 418 {
 419         /* Connecting to core service to find partners */
 420         ch = GNUNET_CORE_connect (GSE_cfg, NULL,
 421                                                                                                                 &core_startup_handler,
 422                                                                                                                 &core_connect_handler,
 423                                                                                                                 &core_disconnect_handler,
 424                                                                                                                 &core_receive_handler,
 425                                                                                                                 GNUNET_NO, NULL, GNUNET_NO, NULL);
 426         if (NULL == ch)
 427         {
 428                         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Failed to connect to CORE service!\n"));
 429                         return;
 430         }
 431
 432         nodes_requested = GNUNET_CONTAINER_multihashmap_create (10, GNUNET_NO);
 433         nodes_active = GNUNET_CONTAINER_multihashmap_create (10, GNUNET_NO);
 434         nodes_inactive = GNUNET_CONTAINER_multihashmap_create (10, GNUNET_NO);
 435 }
 436
 437 /**
 438  * Stop the nodes management
 439  */
 440 void
 441 GNUNET_EXPERIMENTATION_nodes_stop ()
 442 {
 443   if (NULL != ch)
 444   {
 445                 GNUNET_CORE_disconnect (ch);
 446                 ch = NULL;
 447   }
 448
 449   if (NULL != nodes_requested)
 450   {
 451                 GNUNET_CONTAINER_multihashmap_iterate (nodes_requested,
 452                                                                                                                                                                          &cleanup_nodes,
 453                                                                                                                                                                          nodes_requested);
 454                 update_stats (nodes_requested);
 455                 GNUNET_CONTAINER_multihashmap_destroy (nodes_requested);
 456                 nodes_requested = NULL;
 457   }
 458
 459   if (NULL != nodes_active)
 460   {
 461                 GNUNET_CONTAINER_multihashmap_iterate (nodes_active,
 462                                                                                                                                                                          &cleanup_nodes,
 463                                                                                                                                                                          nodes_active);
 464                 update_stats (nodes_active);
 465                 GNUNET_CONTAINER_multihashmap_destroy (nodes_active);
 466                 nodes_active = NULL;
 467   }
 468
 469   if (NULL != nodes_inactive)
 470   {
 471                 GNUNET_CONTAINER_multihashmap_iterate (nodes_inactive,
 472                                                                                                                                                                          &cleanup_nodes,
 473                                                                                                                                                                          nodes_inactive);
 474                 update_stats (nodes_inactive);
 475                 GNUNET_CONTAINER_multihashmap_destroy (nodes_inactive);
 476                 nodes_inactive = NULL;
 477   }
 478 }
 479
 480 /* end of gnunet-daemon-experimentation_nodes.c */