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
  35 /**
  36  * Core handle
  37  */
  38 static struct GNUNET_CORE_Handle *ch;
  39
  40
  41 /**
  42  * Peer's own identity
  43  */
  44 static struct GNUNET_PeerIdentity me;
  45
  46
  47 /**
  48  * Nodes with a pending request
  49  */
  50 struct GNUNET_CONTAINER_MultiHashMap *nodes_requested;
  51
  52
  53 /**
  54  * Active experimentation nodes
  55  */
  56 struct GNUNET_CONTAINER_MultiHashMap *nodes_active;
  57
  58
  59 /**
  60  * Inactive experimentation nodes
  61  * To be excluded from future requests
  62  */
  63 struct GNUNET_CONTAINER_MultiHashMap *nodes_inactive;
  64
  65
  66 /**
  67  * Update statistics
  68  *
  69  * @param m hashmap to update values from
  70  */
  71 static void update_stats (struct GNUNET_CONTAINER_MultiHashMap *m)
  72 {
  73         GNUNET_assert (NULL != m);
  74         GNUNET_assert (NULL != GSE_stats);
  75
  76         if (m == nodes_active)
  77         {
  78                         GNUNET_STATISTICS_set (GSE_stats, "# nodes active",
  79                                         GNUNET_CONTAINER_multihashmap_size(m), GNUNET_NO);
  80         }
  81         else if (m == nodes_inactive)
  82         {
  83                         GNUNET_STATISTICS_set (GSE_stats, "# nodes inactive",
  84                                         GNUNET_CONTAINER_multihashmap_size(m), GNUNET_NO);
  85         }
  86         else if (m == nodes_requested)
  87         {
  88                         GNUNET_STATISTICS_set (GSE_stats, "# nodes requested",
  89                                         GNUNET_CONTAINER_multihashmap_size(m), GNUNET_NO);
  90         }
  91         else
  92                 GNUNET_break (0);
  93
  94 }
  95
  96
  97 /**
  98  * Clean up nodes
  99  *
 100  * @param cls the hashmap to clean up
 101  * @param key key of the current node
 102  * @param value related node object
 103  * @return always GNUNET_OK
 104  */
 105 static int
 106 cleanup_nodes (void *cls,
 107                                                          const struct GNUNET_HashCode * key,
 108                                                          void *value)
 109 {
 110         struct Node *n;
 111         struct GNUNET_CONTAINER_MultiHashMap *cur = cls;
 112
 113         n = value;
 114         if (GNUNET_SCHEDULER_NO_TASK != n->timeout_task)
 115         {
 116                 GNUNET_SCHEDULER_cancel (n->timeout_task);
 117                 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
 118         }
 119         if (NULL != n->cth)
 120         {
 121                 GNUNET_CORE_notify_transmit_ready_cancel (n->cth);
 122                 n->cth = NULL;
 123         }
 124         GNUNET_free_non_null (n->issuer_id);
 125
 126         GNUNET_CONTAINER_multihashmap_remove (cur, key, value);
 127         GNUNET_free (value);
 128         return GNUNET_OK;
 129 }
 130
 131
 132 /**
 133  * Check if id passed is my id
 134  *
 135  * @param id the id to check
 136  * @return GNUNET_YES or GNUNET_NO
 137  */
 138 static int is_me (const struct GNUNET_PeerIdentity *id)
 139 {
 140         if (0 == memcmp (&me, id, sizeof (me)))
 141                 return GNUNET_YES;
 142         else
 143                 return GNUNET_NO;
 144 }
 145
 146 /**
 147  * Core startup callback
 148  *
 149  * @param cls unused
 150  * @param server core service's server handle
 151  * @param my_identity my id
 152  */
 153 static void
 154 core_startup_handler (void *cls,
 155                                                                                         struct GNUNET_CORE_Handle *server,
 156                       const struct GNUNET_PeerIdentity *my_identity)
 157 {
 158         me = *my_identity;
 159 }
 160
 161
 162 /**
 163  * Remove experimentation request due to timeout
 164  *
 165  * @param cls the related node
 166  * @param tc scheduler's task context
 167  */
 168 static void
 169 remove_request (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
 170 {
 171         struct Node *n = cls;
 172
 173         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Removing request for peer %s due to timeout\n"),
 174                         GNUNET_i2s (&n->id));
 175
 176         if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains (nodes_requested, &n->id.hashPubKey))
 177         {
 178                         GNUNET_CONTAINER_multihashmap_remove (nodes_requested, &n->id.hashPubKey, n);
 179                         update_stats (nodes_requested);
 180                         GNUNET_CONTAINER_multihashmap_put (nodes_inactive, &n->id.hashPubKey, n,
 181                                         GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
 182                         update_stats (nodes_inactive);
 183         }
 184
 185         n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
 186         if (NULL != n->cth)
 187         {
 188                 GNUNET_CORE_notify_transmit_ready_cancel (n->cth);
 189                 n->cth = NULL;
 190         }
 191 }
 192
 193
 194 /**
 195  * Core's transmit notify callback to send request
 196  *
 197  * @param cls the related node
 198  * @param bufsize buffer size
 199  * @param buf the buffer to copy to
 200  * @return bytes passed
 201  */
 202 size_t send_request_cb (void *cls, size_t bufsize, void *buf)
 203 {
 204         struct Node *n = cls;
 205         struct Experimentation_Request msg;
 206         size_t msg_size = sizeof (msg);
 207         size_t ri_size = sizeof (struct Experimentation_Issuer) * GSE_my_issuer_count;
 208         size_t total_size = msg_size + ri_size;
 209
 210         memset (buf, '0', bufsize);
 211         n->cth = NULL;
 212   if (buf == NULL)
 213   {
 214     /* client disconnected */
 215     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Client disconnected\n");
 216     if (GNUNET_SCHEDULER_NO_TASK != n->timeout_task)
 217                 GNUNET_SCHEDULER_cancel (n->timeout_task);
 218     GNUNET_SCHEDULER_add_now (&remove_request, n);
 219     return 0;
 220   }
 221   GNUNET_assert (bufsize >= total_size);
 222
 223         msg.msg.size = htons (total_size);
 224         msg.msg.type = htons (GNUNET_MESSAGE_TYPE_EXPERIMENTATION_REQUEST);
 225         msg.capabilities = htonl (GSE_node_capabilities);
 226         msg.issuer_count = htonl (GSE_my_issuer_count);
 227         memcpy (buf, &msg, msg_size);
 228         memcpy (&buf[msg_size], GSE_my_issuer, ri_size);
 229
 230         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Sending request to peer %s\n"),
 231                         GNUNET_i2s (&n->id));
 232         return total_size;
 233 }
 234
 235
 236 /**
 237  * Send request
 238  *
 239  * @param peer the peer to send to
 240  */
 241 static void send_request (const struct GNUNET_PeerIdentity *peer)
 242 {
 243         struct Node *n;
 244         size_t size;
 245         size_t c_issuers;
 246
 247         c_issuers = GSE_my_issuer_count;
 248
 249         size = sizeof (struct Experimentation_Request) +
 250                                  c_issuers * sizeof (struct Experimentation_Issuer);
 251         n = GNUNET_malloc (sizeof (struct Node));
 252         n->id = *peer;
 253         n->timeout_task = GNUNET_SCHEDULER_add_delayed (EXP_RESPONSE_TIMEOUT, &remove_request, n);
 254         n->capabilities = NONE;
 255         n->cth = GNUNET_CORE_notify_transmit_ready(ch, GNUNET_NO, 0,
 256                                                                 GNUNET_TIME_relative_get_forever_(),
 257                                                                 peer, size, send_request_cb, n);
 258
 259         GNUNET_assert (GNUNET_OK == GNUNET_CONTAINER_multihashmap_put (nodes_requested,
 260                         &peer->hashPubKey, n, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
 261         update_stats (nodes_requested);
 262 }
 263
 264
 265 /**
 266  * Core's transmit notify callback to send response
 267  *
 268  * @param cls the related node
 269  * @param bufsize buffer size
 270  * @param buf the buffer to copy to
 271  * @return bytes passed
 272  */
 273 size_t send_response_cb (void *cls, size_t bufsize, void *buf)
 274 {
 275         struct Node *n = cls;
 276         struct Experimentation_Response msg;
 277         size_t ri_size = GSE_my_issuer_count * sizeof (struct Experimentation_Issuer);
 278         size_t msg_size = sizeof (msg);
 279         size_t total_size = msg_size + ri_size;
 280
 281         n->cth = NULL;
 282   if (buf == NULL)
 283   {
 284     /* client disconnected */
 285     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Client disconnected\n");
 286     return 0;
 287   }
 288   GNUNET_assert (bufsize >= total_size);
 289
 290         msg.msg.size = htons (total_size);
 291         msg.msg.type = htons (GNUNET_MESSAGE_TYPE_EXPERIMENTATION_RESPONSE);
 292         msg.capabilities = htonl (GSE_node_capabilities);
 293         msg.issuer_count = htonl (GSE_my_issuer_count);
 294         memcpy (buf, &msg, msg_size);
 295         memcpy (&buf[msg_size], GSE_my_issuer, ri_size);
 296
 297         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Sending response to peer %s\n"),
 298                         GNUNET_i2s (&n->id));
 299         return total_size;
 300 }
 301
 302
 303 static void
 304 get_experiments_cb (struct Node *n, struct Experiment *e)
 305 {
 306         static int counter = 0;
 307         if (NULL == e)
 308         {
 309                         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Added %u experiments for peer %s\n"),
 310                                         counter, GNUNET_i2s (&n->id));
 311                         return;
 312         }
 313
 314         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Starting experiment `%s' with peer %s\n"),
 315                         e->name,
 316                         GNUNET_i2s (&n->id));
 317         //GNUNET_EXPERIMENTATION_scheduler_add (e);
 318         counter ++;
 319 }
 320
 321 /**
 322  * Set a specific node as active
 323  *
 324  * @param n the node
 325  */
 326 static void node_make_active (struct Node *n)
 327 {
 328         int c1;
 329   GNUNET_CONTAINER_multihashmap_put (nodes_active,
 330                         &n->id.hashPubKey, n, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
 331         update_stats (nodes_active);
 332         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Added peer `%s' as active node\n"),
 333                         GNUNET_i2s (&n->id));
 334
 335         /* Request experiments for this node to start them */
 336         for (c1 = 0; c1 < n->issuer_count; c1++)
 337         {
 338
 339                 GNUNET_EXPERIMENTATION_experiments_get (n, &n->issuer_id[c1], &get_experiments_cb);
 340         }
 341 }
 342
 343
 344 /**
 345  * Handle a request and send a response
 346  *
 347  * @param peer the source
 348  * @param message the message
 349  */
 350 static void handle_request (const struct GNUNET_PeerIdentity *peer,
 351                                                                                                                 const struct GNUNET_MessageHeader *message)
 352 {
 353         struct Node *n;
 354         struct Experimentation_Request *rm = (struct Experimentation_Request *) message;
 355         struct Experimentation_Issuer *rmi = (struct Experimentation_Issuer *) &rm[1];
 356         int c1;
 357         int c2;
 358         uint32_t ic;
 359         uint32_t ic_accepted;
 360         int make_active;
 361
 362         if (ntohs (message->size) < sizeof (struct Experimentation_Request))
 363         {
 364                 GNUNET_break (0);
 365                 return;
 366         }
 367         ic = ntohl (rm->issuer_count);
 368         if (ntohs (message->size) != sizeof (struct Experimentation_Request) + ic * sizeof (struct Experimentation_Issuer))
 369         {
 370                 GNUNET_break (0);
 371                 return;
 372         }
 373
 374         make_active = GNUNET_NO;
 375         if (NULL != (n = GNUNET_CONTAINER_multihashmap_get (nodes_active, &peer->hashPubKey)))
 376         {
 377                         /* Nothing to do */
 378         }
 379         else if (NULL != (n = GNUNET_CONTAINER_multihashmap_get (nodes_requested, &peer->hashPubKey)))
 380         {
 381                         GNUNET_CONTAINER_multihashmap_remove (nodes_requested, &peer->hashPubKey, n);
 382                         if (GNUNET_SCHEDULER_NO_TASK != n->timeout_task)
 383                         {
 384                                 GNUNET_SCHEDULER_cancel (n->timeout_task);
 385                                 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
 386                         }
 387                         if (NULL != n->cth)
 388                         {
 389                                 GNUNET_CORE_notify_transmit_ready_cancel (n->cth);
 390                                 n->cth = NULL;
 391                         }
 392                         update_stats (nodes_requested);
 393                         make_active = GNUNET_YES;
 394         }
 395         else if (NULL != (n = GNUNET_CONTAINER_multihashmap_get (nodes_inactive, &peer->hashPubKey)))
 396         {
 397                         GNUNET_CONTAINER_multihashmap_remove (nodes_inactive, &peer->hashPubKey, n);
 398                         update_stats (nodes_inactive);
 399                         make_active = GNUNET_YES;
 400         }
 401         else
 402         {
 403                         /* Create new node */
 404                         n = GNUNET_malloc (sizeof (struct Node));
 405                         n->id = *peer;
 406                         n->capabilities = NONE;
 407                         make_active = GNUNET_YES;
 408         }
 409
 410         /* Update node */
 411         n->capabilities = ntohl (rm->capabilities);
 412
 413         /* Filter accepted issuer */
 414         ic_accepted = 0;
 415         for (c1 = 0; c1 < ic; c1++)
 416         {
 417                 if (GNUNET_YES == GNUNET_EXPERIMENTATION_experiments_issuer_accepted(&rmi[c1].issuer_id))
 418                         ic_accepted ++;
 419         }
 420         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Request from peer `%s' with %u issuers, we accepted %u issuer \n"),
 421                         GNUNET_i2s (peer), ic, ic_accepted);
 422         GNUNET_free_non_null (n->issuer_id);
 423         n->issuer_id = GNUNET_malloc (ic_accepted * sizeof (struct GNUNET_PeerIdentity));
 424         c2 = 0;
 425         for (c1 = 0; c1 < ic; c1++)
 426         {
 427                         if (GNUNET_YES == GNUNET_EXPERIMENTATION_experiments_issuer_accepted(&rmi[c1].issuer_id))
 428                         {
 429                                 n->issuer_id[c2] = rmi[c1].issuer_id;
 430                                 c2 ++;
 431                         }
 432         }
 433         n->issuer_count = ic_accepted;
 434
 435         if (GNUNET_YES == make_active)
 436                 node_make_active (n);
 437
 438         /* Send response */
 439         n->cth = GNUNET_CORE_notify_transmit_ready (ch, GNUNET_NO, 0,
 440                                                                 GNUNET_TIME_relative_get_forever_(),
 441                                                                 peer,
 442                                                                 sizeof (struct Experimentation_Response) +
 443                                                                 GSE_my_issuer_count * sizeof (struct Experimentation_Issuer),
 444                                                                 send_response_cb, n);
 445 }
 446
 447
 448 /**
 449  * Handle a response
 450  *
 451  * @param peer the source
 452  * @param message the message
 453  */
 454 static void handle_response (const struct GNUNET_PeerIdentity *peer,
 455                                                                                                                  const struct GNUNET_MessageHeader *message)
 456 {
 457         struct Node *n;
 458         struct Experimentation_Response *rm = (struct Experimentation_Response *) message;
 459         struct Experimentation_Issuer *rmi = (struct Experimentation_Issuer *) &rm[1];
 460         uint32_t ic;
 461         uint32_t ic_accepted;
 462         int make_active;
 463         unsigned int c1;
 464         unsigned int c2;
 465
 466
 467         if (ntohs (message->size) < sizeof (struct Experimentation_Response))
 468         {
 469                 GNUNET_break (0);
 470                 return;
 471         }
 472         ic = ntohl (rm->issuer_count);
 473         if (ntohs (message->size) != sizeof (struct Experimentation_Response) + ic * sizeof (struct Experimentation_Issuer))
 474         {
 475                 GNUNET_break (0);
 476                 return;
 477         }
 478
 479         make_active = GNUNET_NO;
 480         if (NULL != (n = GNUNET_CONTAINER_multihashmap_get (nodes_active, &peer->hashPubKey)))
 481         {
 482                         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Received %s from %s peer `%s'\n"),
 483                                         "RESPONSE", "active", GNUNET_i2s (peer));
 484         }
 485         else if (NULL != (n = GNUNET_CONTAINER_multihashmap_get (nodes_requested, &peer->hashPubKey)))
 486         {
 487                         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Received %s from %s peer `%s'\n"),
 488                                         "RESPONSE", "requested", GNUNET_i2s (peer));
 489                         GNUNET_CONTAINER_multihashmap_remove (nodes_requested, &peer->hashPubKey, n);
 490                         if (GNUNET_SCHEDULER_NO_TASK != n->timeout_task)
 491                         {
 492                                 GNUNET_SCHEDULER_cancel (n->timeout_task);
 493                                 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
 494                         }
 495                         if (NULL != n->cth)
 496                         {
 497                                 GNUNET_CORE_notify_transmit_ready_cancel (n->cth);
 498                                 n->cth = NULL;
 499                         }
 500                         update_stats (nodes_requested);
 501                         make_active = GNUNET_YES;
 502         }
 503         else if (NULL != (n = GNUNET_CONTAINER_multihashmap_get (nodes_inactive, &peer->hashPubKey)))
 504         {
 505                         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Received %s from peer `%s'\n"),
 506                                         "RESPONSE", "inactive", GNUNET_i2s (peer));
 507                         GNUNET_CONTAINER_multihashmap_remove (nodes_inactive, &peer->hashPubKey, n);
 508                         update_stats (nodes_inactive);
 509                         make_active = GNUNET_YES;
 510         }
 511         else
 512         {
 513                         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Received %s from %s peer `%s'\n"),
 514                                         "RESPONSE", "unknown", GNUNET_i2s (peer));
 515                         return;
 516         }
 517
 518         /* Update */
 519         n->capabilities = ntohl (rm->capabilities);
 520
 521         /* Filter accepted issuer */
 522         ic_accepted = 0;
 523         for (c1 = 0; c1 < ic; c1++)
 524         {
 525                 if (GNUNET_YES == GNUNET_EXPERIMENTATION_experiments_issuer_accepted(&rmi[c1].issuer_id))
 526                         ic_accepted ++;
 527         }
 528         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Response from peer `%s' with %u issuers, we accepted %u issuer \n"),
 529                         GNUNET_i2s (peer), ic, ic_accepted);
 530         GNUNET_free_non_null (n->issuer_id);
 531         n->issuer_id = GNUNET_malloc (ic_accepted * sizeof (struct GNUNET_PeerIdentity));
 532         c2 = 0;
 533         for (c1 = 0; c1 < ic; c1++)
 534         {
 535                         if (GNUNET_YES == GNUNET_EXPERIMENTATION_experiments_issuer_accepted(&rmi[c1].issuer_id))
 536                         {
 537                                 n->issuer_id[c2] = rmi[c1].issuer_id;
 538                                 c2 ++;
 539                         }
 540         }
 541         n->issuer_count = ic_accepted;
 542
 543         if (GNUNET_YES == make_active)
 544                 node_make_active (n);
 545 }
 546
 547 /**
 548  * Method called whenever a given peer connects.
 549  *
 550  * @param cls closure
 551  * @param peer peer identity this notification is about
 552  */
 553 void core_connect_handler (void *cls,
 554                            const struct GNUNET_PeerIdentity *peer)
 555 {
 556         if (GNUNET_YES == is_me(peer))
 557                 return;
 558
 559         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Connected to peer %s\n"),
 560                         GNUNET_i2s (peer));
 561
 562         if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains (nodes_requested, &peer->hashPubKey))
 563                 return; /* We already sent a request */
 564
 565         if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains (nodes_active, &peer->hashPubKey))
 566                 return; /* This peer is known as active  */
 567
 568         if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains (nodes_inactive, &peer->hashPubKey))
 569                 return; /* This peer is known as inactive  */
 570
 571         send_request (peer);
 572
 573 }
 574
 575
 576 /**
 577  * Method called whenever a given peer disconnects.
 578  *
 579  * @param cls closure
 580  * @param peer peer identity this notification is about
 581  */
 582 void core_disconnect_handler (void *cls,
 583                            const struct GNUNET_PeerIdentity * peer)
 584 {
 585         if (GNUNET_YES == is_me(peer))
 586                 return;
 587
 588         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Disconnected from peer %s\n"),
 589                         GNUNET_i2s (peer));
 590
 591 }
 592
 593
 594 /**
 595  * Handle a request and send a response
 596  *
 597  * @param cls unused
 598  * @param other the sender
 599  * @param message the message
 600  * @return GNUNET_OK to keep connection, GNUNET_SYSERR on error
 601  */
 602 static int
 603 core_receive_handler (void *cls,
 604                                                                                         const struct GNUNET_PeerIdentity *other,
 605                                                                                         const struct GNUNET_MessageHeader *message)
 606 {
 607         if (ntohs (message->size) < sizeof (struct GNUNET_MessageHeader))
 608         {
 609                         GNUNET_break (0);
 610                         return GNUNET_SYSERR;
 611         }
 612
 613         switch (ntohs (message->type)) {
 614                 case GNUNET_MESSAGE_TYPE_EXPERIMENTATION_REQUEST:
 615                         handle_request (other, message);
 616                         break;
 617                 case GNUNET_MESSAGE_TYPE_EXPERIMENTATION_RESPONSE:
 618                         handle_response (other, message);
 619                         break;
 620                 default:
 621                         break;
 622         }
 623
 624         return GNUNET_OK;
 625 }
 626
 627
 628
 629 /**
 630  * Start the nodes management
 631  */
 632 void
 633 GNUNET_EXPERIMENTATION_nodes_start ()
 634 {
 635         /* Connecting to core service to find partners */
 636         ch = GNUNET_CORE_connect (GSE_cfg, NULL,
 637                                                                                                                 &core_startup_handler,
 638                                                                                                                 &core_connect_handler,
 639                                                                                                                 &core_disconnect_handler,
 640                                                                                                                 &core_receive_handler,
 641                                                                                                                 GNUNET_NO, NULL, GNUNET_NO, NULL);
 642         if (NULL == ch)
 643         {
 644                         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Failed to connect to CORE service!\n"));
 645                         return;
 646         }
 647
 648         nodes_requested = GNUNET_CONTAINER_multihashmap_create (10, GNUNET_NO);
 649         nodes_active = GNUNET_CONTAINER_multihashmap_create (10, GNUNET_NO);
 650         nodes_inactive = GNUNET_CONTAINER_multihashmap_create (10, GNUNET_NO);
 651 }
 652
 653
 654 /**
 655  * Stop the nodes management
 656  */
 657 void
 658 GNUNET_EXPERIMENTATION_nodes_stop ()
 659 {
 660   if (NULL != ch)
 661   {
 662                 GNUNET_CORE_disconnect (ch);
 663                 ch = NULL;
 664   }
 665
 666   if (NULL != nodes_requested)
 667   {
 668                 GNUNET_CONTAINER_multihashmap_iterate (nodes_requested,
 669                                                                                                                                                                          &cleanup_nodes,
 670                                                                                                                                                                          nodes_requested);
 671                 update_stats (nodes_requested);
 672                 GNUNET_CONTAINER_multihashmap_destroy (nodes_requested);
 673                 nodes_requested = NULL;
 674   }
 675
 676   if (NULL != nodes_active)
 677   {
 678                 GNUNET_CONTAINER_multihashmap_iterate (nodes_active,
 679                                                                                                                                                                          &cleanup_nodes,
 680                                                                                                                                                                          nodes_active);
 681                 update_stats (nodes_active);
 682                 GNUNET_CONTAINER_multihashmap_destroy (nodes_active);
 683                 nodes_active = NULL;
 684   }
 685
 686   if (NULL != nodes_inactive)
 687   {
 688                 GNUNET_CONTAINER_multihashmap_iterate (nodes_inactive,
 689                                                                                                                                                                          &cleanup_nodes,
 690                                                                                                                                                                          nodes_inactive);
 691                 update_stats (nodes_inactive);
 692                 GNUNET_CONTAINER_multihashmap_destroy (nodes_inactive);
 693                 nodes_inactive = NULL;
 694   }
 695 }
 696
 697 /* end of gnunet-daemon-experimentation_nodes.c */