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 (&((char *) 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 (&((char *) 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
 318         /* Request experiment */
 319         GNUNET_EXPERIMENTATION_scheduler_add (n, e);
 320
 321         counter ++;
 322 }
 323
 324 /**
 325  * Set a specific node as active
 326  *
 327  * @param n the node
 328  */
 329 static void node_make_active (struct Node *n)
 330 {
 331         int c1;
 332   GNUNET_CONTAINER_multihashmap_put (nodes_active,
 333                         &n->id.hashPubKey, n, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
 334         update_stats (nodes_active);
 335         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Added peer `%s' as active node\n"),
 336                         GNUNET_i2s (&n->id));
 337
 338         /* Request experiments for this node to start them */
 339         for (c1 = 0; c1 < n->issuer_count; c1++)
 340         {
 341
 342                 GNUNET_EXPERIMENTATION_experiments_get (n, &n->issuer_id[c1], &get_experiments_cb);
 343         }
 344 }
 345
 346
 347 /**
 348  * Handle a request and send a response
 349  *
 350  * @param peer the source
 351  * @param message the message
 352  */
 353 static void handle_request (const struct GNUNET_PeerIdentity *peer,
 354                                                                                                                 const struct GNUNET_MessageHeader *message)
 355 {
 356         struct Node *n;
 357         struct Experimentation_Request *rm = (struct Experimentation_Request *) message;
 358         struct Experimentation_Issuer *rmi = (struct Experimentation_Issuer *) &rm[1];
 359         int c1;
 360         int c2;
 361         uint32_t ic;
 362         uint32_t ic_accepted;
 363         int make_active;
 364
 365         if (ntohs (message->size) < sizeof (struct Experimentation_Request))
 366         {
 367                 GNUNET_break (0);
 368                 return;
 369         }
 370         ic = ntohl (rm->issuer_count);
 371         if (ntohs (message->size) != sizeof (struct Experimentation_Request) + ic * sizeof (struct Experimentation_Issuer))
 372         {
 373                 GNUNET_break (0);
 374                 return;
 375         }
 376
 377         make_active = GNUNET_NO;
 378         if (NULL != (n = GNUNET_CONTAINER_multihashmap_get (nodes_active, &peer->hashPubKey)))
 379         {
 380                         /* Nothing to do */
 381         }
 382         else if (NULL != (n = GNUNET_CONTAINER_multihashmap_get (nodes_requested, &peer->hashPubKey)))
 383         {
 384                         GNUNET_CONTAINER_multihashmap_remove (nodes_requested, &peer->hashPubKey, n);
 385                         if (GNUNET_SCHEDULER_NO_TASK != n->timeout_task)
 386                         {
 387                                 GNUNET_SCHEDULER_cancel (n->timeout_task);
 388                                 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
 389                         }
 390                         if (NULL != n->cth)
 391                         {
 392                                 GNUNET_CORE_notify_transmit_ready_cancel (n->cth);
 393                                 n->cth = NULL;
 394                         }
 395                         update_stats (nodes_requested);
 396                         make_active = GNUNET_YES;
 397         }
 398         else if (NULL != (n = GNUNET_CONTAINER_multihashmap_get (nodes_inactive, &peer->hashPubKey)))
 399         {
 400                         GNUNET_CONTAINER_multihashmap_remove (nodes_inactive, &peer->hashPubKey, n);
 401                         update_stats (nodes_inactive);
 402                         make_active = GNUNET_YES;
 403         }
 404         else
 405         {
 406                         /* Create new node */
 407                         n = GNUNET_malloc (sizeof (struct Node));
 408                         n->id = *peer;
 409                         n->capabilities = NONE;
 410                         make_active = GNUNET_YES;
 411         }
 412
 413         /* Update node */
 414         n->capabilities = ntohl (rm->capabilities);
 415
 416         /* Filter accepted issuer */
 417         ic_accepted = 0;
 418         for (c1 = 0; c1 < ic; c1++)
 419         {
 420                 if (GNUNET_YES == GNUNET_EXPERIMENTATION_experiments_issuer_accepted(&rmi[c1].issuer_id))
 421                         ic_accepted ++;
 422         }
 423         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Request from peer `%s' with %u issuers, we accepted %u issuer \n"),
 424                         GNUNET_i2s (peer), ic, ic_accepted);
 425         GNUNET_free_non_null (n->issuer_id);
 426         n->issuer_id = GNUNET_malloc (ic_accepted * sizeof (struct GNUNET_PeerIdentity));
 427         c2 = 0;
 428         for (c1 = 0; c1 < ic; c1++)
 429         {
 430                         if (GNUNET_YES == GNUNET_EXPERIMENTATION_experiments_issuer_accepted(&rmi[c1].issuer_id))
 431                         {
 432                                 n->issuer_id[c2] = rmi[c1].issuer_id;
 433                                 c2 ++;
 434                         }
 435         }
 436         n->issuer_count = ic_accepted;
 437
 438         if (GNUNET_YES == make_active)
 439                 node_make_active (n);
 440
 441         /* Send response */
 442         n->cth = GNUNET_CORE_notify_transmit_ready (ch, GNUNET_NO, 0,
 443                                                                 GNUNET_TIME_relative_get_forever_(),
 444                                                                 peer,
 445                                                                 sizeof (struct Experimentation_Response) +
 446                                                                 GSE_my_issuer_count * sizeof (struct Experimentation_Issuer),
 447                                                                 send_response_cb, n);
 448 }
 449
 450
 451 /**
 452  * Handle a response
 453  *
 454  * @param peer the source
 455  * @param message the message
 456  */
 457 static void handle_response (const struct GNUNET_PeerIdentity *peer,
 458                                                                                                                  const struct GNUNET_MessageHeader *message)
 459 {
 460         struct Node *n;
 461         struct Experimentation_Response *rm = (struct Experimentation_Response *) message;
 462         struct Experimentation_Issuer *rmi = (struct Experimentation_Issuer *) &rm[1];
 463         uint32_t ic;
 464         uint32_t ic_accepted;
 465         int make_active;
 466         unsigned int c1;
 467         unsigned int c2;
 468
 469
 470         if (ntohs (message->size) < sizeof (struct Experimentation_Response))
 471         {
 472                 GNUNET_break (0);
 473                 return;
 474         }
 475         ic = ntohl (rm->issuer_count);
 476         if (ntohs (message->size) != sizeof (struct Experimentation_Response) + ic * sizeof (struct Experimentation_Issuer))
 477         {
 478                 GNUNET_break (0);
 479                 return;
 480         }
 481
 482         make_active = GNUNET_NO;
 483         if (NULL != (n = GNUNET_CONTAINER_multihashmap_get (nodes_active, &peer->hashPubKey)))
 484         {
 485                         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Received %s from %s peer `%s'\n"),
 486                                         "RESPONSE", "active", GNUNET_i2s (peer));
 487         }
 488         else if (NULL != (n = GNUNET_CONTAINER_multihashmap_get (nodes_requested, &peer->hashPubKey)))
 489         {
 490                         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Received %s from %s peer `%s'\n"),
 491                                         "RESPONSE", "requested", GNUNET_i2s (peer));
 492                         GNUNET_CONTAINER_multihashmap_remove (nodes_requested, &peer->hashPubKey, n);
 493                         if (GNUNET_SCHEDULER_NO_TASK != n->timeout_task)
 494                         {
 495                                 GNUNET_SCHEDULER_cancel (n->timeout_task);
 496                                 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
 497                         }
 498                         if (NULL != n->cth)
 499                         {
 500                                 GNUNET_CORE_notify_transmit_ready_cancel (n->cth);
 501                                 n->cth = NULL;
 502                         }
 503                         update_stats (nodes_requested);
 504                         make_active = GNUNET_YES;
 505         }
 506         else if (NULL != (n = GNUNET_CONTAINER_multihashmap_get (nodes_inactive, &peer->hashPubKey)))
 507         {
 508                         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Received %s from peer `%s'\n"),
 509                                         "RESPONSE", "inactive", GNUNET_i2s (peer));
 510                         GNUNET_CONTAINER_multihashmap_remove (nodes_inactive, &peer->hashPubKey, n);
 511                         update_stats (nodes_inactive);
 512                         make_active = GNUNET_YES;
 513         }
 514         else
 515         {
 516                         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Received %s from %s peer `%s'\n"),
 517                                         "RESPONSE", "unknown", GNUNET_i2s (peer));
 518                         return;
 519         }
 520
 521         /* Update */
 522         n->capabilities = ntohl (rm->capabilities);
 523
 524         /* Filter accepted issuer */
 525         ic_accepted = 0;
 526         for (c1 = 0; c1 < ic; c1++)
 527         {
 528                 if (GNUNET_YES == GNUNET_EXPERIMENTATION_experiments_issuer_accepted(&rmi[c1].issuer_id))
 529                         ic_accepted ++;
 530         }
 531         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Response from peer `%s' with %u issuers, we accepted %u issuer \n"),
 532                         GNUNET_i2s (peer), ic, ic_accepted);
 533         GNUNET_free_non_null (n->issuer_id);
 534         n->issuer_id = GNUNET_malloc (ic_accepted * sizeof (struct GNUNET_PeerIdentity));
 535         c2 = 0;
 536         for (c1 = 0; c1 < ic; c1++)
 537         {
 538                         if (GNUNET_YES == GNUNET_EXPERIMENTATION_experiments_issuer_accepted(&rmi[c1].issuer_id))
 539                         {
 540                                 n->issuer_id[c2] = rmi[c1].issuer_id;
 541                                 c2 ++;
 542                         }
 543         }
 544         n->issuer_count = ic_accepted;
 545
 546         if (GNUNET_YES == make_active)
 547                 node_make_active (n);
 548 }
 549
 550 /**
 551  * Method called whenever a given peer connects.
 552  *
 553  * @param cls closure
 554  * @param peer peer identity this notification is about
 555  */
 556 void core_connect_handler (void *cls,
 557                            const struct GNUNET_PeerIdentity *peer)
 558 {
 559         if (GNUNET_YES == is_me(peer))
 560                 return;
 561
 562         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Connected to peer %s\n"),
 563                         GNUNET_i2s (peer));
 564
 565         if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains (nodes_requested, &peer->hashPubKey))
 566                 return; /* We already sent a request */
 567
 568         if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains (nodes_active, &peer->hashPubKey))
 569                 return; /* This peer is known as active  */
 570
 571         if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains (nodes_inactive, &peer->hashPubKey))
 572                 return; /* This peer is known as inactive  */
 573
 574         send_request (peer);
 575
 576 }
 577
 578
 579 /**
 580  * Method called whenever a given peer disconnects.
 581  *
 582  * @param cls closure
 583  * @param peer peer identity this notification is about
 584  */
 585 void core_disconnect_handler (void *cls,
 586                            const struct GNUNET_PeerIdentity * peer)
 587 {
 588         if (GNUNET_YES == is_me(peer))
 589                 return;
 590
 591         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Disconnected from peer %s\n"),
 592                         GNUNET_i2s (peer));
 593
 594 }
 595
 596
 597 /**
 598  * Handle a request and send a response
 599  *
 600  * @param cls unused
 601  * @param other the sender
 602  * @param message the message
 603  * @return GNUNET_OK to keep connection, GNUNET_SYSERR on error
 604  */
 605 static int
 606 core_receive_handler (void *cls,
 607                                                                                         const struct GNUNET_PeerIdentity *other,
 608                                                                                         const struct GNUNET_MessageHeader *message)
 609 {
 610         if (ntohs (message->size) < sizeof (struct GNUNET_MessageHeader))
 611         {
 612                         GNUNET_break (0);
 613                         return GNUNET_SYSERR;
 614         }
 615
 616         switch (ntohs (message->type)) {
 617                 case GNUNET_MESSAGE_TYPE_EXPERIMENTATION_REQUEST:
 618                         handle_request (other, message);
 619                         break;
 620                 case GNUNET_MESSAGE_TYPE_EXPERIMENTATION_RESPONSE:
 621                         handle_response (other, message);
 622                         break;
 623                 default:
 624                         break;
 625         }
 626
 627         return GNUNET_OK;
 628 }
 629
 630
 631 void
 632 GNUNET_EXPERIMENT_nodes_request_start (struct Node *n, struct Experiment *e)
 633 {
 634         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Sending start request to peer `%s' for experiment `%s'\n"),
 635                         GNUNET_i2s(&n->id), e->name);
 636 }
 637
 638
 639 /**
 640  * Start the nodes management
 641  */
 642 void
 643 GNUNET_EXPERIMENTATION_nodes_start ()
 644 {
 645         /* Connecting to core service to find partners */
 646         ch = GNUNET_CORE_connect (GSE_cfg, NULL,
 647                                                                                                                 &core_startup_handler,
 648                                                                                                                 &core_connect_handler,
 649                                                                                                                 &core_disconnect_handler,
 650                                                                                                                 &core_receive_handler,
 651                                                                                                                 GNUNET_NO, NULL, GNUNET_NO, NULL);
 652         if (NULL == ch)
 653         {
 654                         GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Failed to connect to CORE service!\n"));
 655                         return;
 656         }
 657
 658         nodes_requested = GNUNET_CONTAINER_multihashmap_create (10, GNUNET_NO);
 659         nodes_active = GNUNET_CONTAINER_multihashmap_create (10, GNUNET_NO);
 660         nodes_inactive = GNUNET_CONTAINER_multihashmap_create (10, GNUNET_NO);
 661 }
 662
 663
 664 /**
 665  * Stop the nodes management
 666  */
 667 void
 668 GNUNET_EXPERIMENTATION_nodes_stop ()
 669 {
 670   if (NULL != ch)
 671   {
 672                 GNUNET_CORE_disconnect (ch);
 673                 ch = NULL;
 674   }
 675
 676   if (NULL != nodes_requested)
 677   {
 678                 GNUNET_CONTAINER_multihashmap_iterate (nodes_requested,
 679                                                                                                                                                                          &cleanup_nodes,
 680                                                                                                                                                                          nodes_requested);
 681                 update_stats (nodes_requested);
 682                 GNUNET_CONTAINER_multihashmap_destroy (nodes_requested);
 683                 nodes_requested = NULL;
 684   }
 685
 686   if (NULL != nodes_active)
 687   {
 688                 GNUNET_CONTAINER_multihashmap_iterate (nodes_active,
 689                                                                                                                                                                          &cleanup_nodes,
 690                                                                                                                                                                          nodes_active);
 691                 update_stats (nodes_active);
 692                 GNUNET_CONTAINER_multihashmap_destroy (nodes_active);
 693                 nodes_active = NULL;
 694   }
 695
 696   if (NULL != nodes_inactive)
 697   {
 698                 GNUNET_CONTAINER_multihashmap_iterate (nodes_inactive,
 699                                                                                                                                                                          &cleanup_nodes,
 700                                                                                                                                                                          nodes_inactive);
 701                 update_stats (nodes_inactive);
 702                 GNUNET_CONTAINER_multihashmap_destroy (nodes_inactive);
 703                 nodes_inactive = NULL;
 704   }
 705 }
 706
 707 /* end of gnunet-daemon-experimentation_nodes.c */