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22 * @file rps/gnunet-service-rps.c
23 * @brief rps service implementation
24 * @author Julius Bünger
27 #include "gnunet_util_lib.h"
28 #include "gnunet_cadet_service.h"
29 #include "gnunet_nse_service.h"
32 #include "gnunet-service-rps_sampler.h"
37 #define LOG(kind, ...) GNUNET_log(kind, __VA_ARGS__)
39 // TODO modify @brief in every file
41 // TODO check for overflows
43 // TODO align message structs
45 // (TODO api -- possibility of getting weak random peer immideately)
47 // TODO malicious peer
49 // TODO connect to friends
51 // TODO store peers somewhere
55 // hist_size_init, hist_size_max
60 static const struct GNUNET_CONFIGURATION_Handle *cfg;
65 static struct GNUNET_PeerIdentity *own_identity;
68 struct GNUNET_PeerIdentity *
69 get_rand_peer_ignore_list (const struct GNUNET_PeerIdentity *peer_list, unsigned int size,
70 const struct GNUNET_PeerIdentity *ignore_list, unsigned int ignore_size);
73 /***********************************************************************
74 * Housekeeping with peers
75 ***********************************************************************/
78 * Struct used to store the context of a connected client.
83 * The message queue to communicate with the client.
85 struct GNUNET_MQ_Handle *mq;
89 * Used to keep track in what lists single peerIDs are.
93 PULL_REPLY_PENDING = 0x01,
94 IN_OTHER_GOSSIP_LIST = 0x02, // unneeded?
95 IN_OWN_SAMPLER_LIST = 0x04, // unneeded?
96 IN_OWN_GOSSIP_LIST = 0x08, // unneeded?
99 * We set this bit when we can be sure the other peer is/was live.
106 * Functions of this type can be used to be stored at a peer for later execution.
108 typedef void (* PeerOp) (void *cls, const struct GNUNET_PeerIdentity *peer);
111 * Outstanding operation on peer consisting of callback and closure
113 struct PeerOutstandingOp
128 * Struct used to keep track of other peer's status
130 * This is stored in a multipeermap.
135 * In own gossip/sampler list, in other's gossip/sampler list
140 * Message queue open to client
142 struct GNUNET_MQ_Handle *mq;
145 * Channel open to client.
147 struct GNUNET_CADET_Channel *send_channel;
150 * Channel open from client.
152 struct GNUNET_CADET_Channel *recv_channel; // unneeded?
155 * Array of outstanding operations on this peer.
157 struct PeerOutstandingOp *outstanding_ops;
160 * Number of outstanding operations.
162 unsigned int num_outstanding_ops;
163 //size_t num_outstanding_ops;
166 * Handle to the callback given to cadet_ntfy_tmt_rdy()
168 * To be canceled on shutdown.
170 struct GNUNET_CADET_TransmitHandle *is_live_task;
173 * This is pobably followed by 'statistical' data (when we first saw
174 * him, how did we get his ID, how many pushes (in a timeinterval),
179 /***********************************************************************
180 * /Housekeeping with peers
181 ***********************************************************************/
183 /***********************************************************************
185 ***********************************************************************/
188 * Set of all peers to keep track of them.
190 static struct GNUNET_CONTAINER_MultiPeerMap *peer_map;
194 * The gossiped list of peers.
196 static struct GNUNET_PeerIdentity *gossip_list;
199 * Size of the gossiped list
201 //static unsigned int gossip_list_size;
202 static uint32_t gossip_list_size;
206 * The actual size of the sampler
208 static unsigned int sampler_size;
209 //size_t sampler_size;
212 * The size of sampler we need to be able to satisfy the client's need of
215 static unsigned int sampler_size_client_need;
218 * The size of sampler we need to be able to satisfy the Brahms protocol's
219 * need of random peers.
221 * This is directly taken as the #gossip_list_size on update of the
224 * This is one minimum size the sampler grows to.
226 static unsigned int sampler_size_est_need;
230 * Percentage of total peer number in the gossip list
231 * to send random PUSHes to
236 * Percentage of total peer number in the gossip list
237 * to send random PULLs to
242 * The percentage gamma of history updates.
243 * Simply 1 - alpha - beta
248 * Identifier for the main task that runs periodically.
250 static struct GNUNET_SCHEDULER_Task *do_round_task;
253 * Time inverval the do_round task runs in.
255 static struct GNUNET_TIME_Relative round_interval;
260 * List to store peers received through pushes temporary.
262 * TODO -> multipeermap
264 static struct GNUNET_PeerIdentity *push_list;
267 * Size of the push_list;
269 static unsigned int push_list_size;
270 //size_t push_list_size;
273 * List to store peers received through pulls temporary.
275 * TODO -> multipeermap
277 static struct GNUNET_PeerIdentity *pull_list;
280 * Size of the pull_list;
282 static unsigned int pull_list_size;
283 //size_t pull_list_size;
289 static struct GNUNET_NSE_Handle *nse;
294 static struct GNUNET_CADET_Handle *cadet_handle;
300 * Only needed in the beginning to check how many of the 64 deltas
303 static unsigned int req_counter;
306 * Time of the last request we received.
308 * Used to compute the expected request rate.
310 static struct GNUNET_TIME_Absolute last_request;
313 * Size of #request_deltas.
315 #define REQUEST_DELTAS_SIZE 64
316 static unsigned int request_deltas_size = REQUEST_DELTAS_SIZE;
319 * Last 64 deltas between requests
321 static struct GNUNET_TIME_Relative request_deltas[REQUEST_DELTAS_SIZE];
324 * The prediction of the rate of requests
326 static struct GNUNET_TIME_Relative request_rate;
330 * List with the peers we sent requests to.
332 struct GNUNET_PeerIdentity *pending_pull_reply_list;
335 * Size of #pending_pull_reply_list.
337 uint32_t pending_pull_reply_list_size;
341 * Number of history update tasks.
343 uint32_t num_hist_update_tasks;
346 /***********************************************************************
348 ***********************************************************************/
351 /***********************************************************************
353 ***********************************************************************/
356 * Check if peer is already in peer array.
359 in_arr (const struct GNUNET_PeerIdentity *array,
360 unsigned int arr_size,
361 const struct GNUNET_PeerIdentity *peer)
363 GNUNET_assert (NULL != peer);
368 GNUNET_assert (NULL != array);
373 while (0 != GNUNET_CRYPTO_cmp_peer_identity (&array[i], peer) &&
384 * Remove peer from list.
387 rem_from_list (struct GNUNET_PeerIdentity *peer_list,
388 unsigned int *list_size,
389 const struct GNUNET_PeerIdentity *peer)
393 for ( i = 0 ; i < *list_size ; i++ )
395 if (0 == GNUNET_CRYPTO_cmp_peer_identity (&peer_list[i], peer))
397 if (i < *list_size -1)
398 { /* Not at the last entry -- shift peers left */
399 memcpy (&peer_list[i], &peer_list[i +1],
400 (*list_size - i -1) * sizeof (struct GNUNET_PeerIdentity));
402 /* Remove last entry (should be now useless PeerID) */
403 GNUNET_array_grow (peer_list, *list_size, *list_size -1);
409 * Get random peer from the given list but don't return one from the @a ignore_list.
411 struct GNUNET_PeerIdentity *
412 get_rand_peer_ignore_list (const struct GNUNET_PeerIdentity *peer_list,
414 const struct GNUNET_PeerIdentity *ignore_list,
415 uint32_t ignore_size)
419 struct GNUNET_PeerIdentity *tmp_peer_list;
420 struct GNUNET_PeerIdentity *peer;
422 GNUNET_assert (NULL != peer_list);
425 tmp_peer_list = NULL;
426 GNUNET_array_grow (tmp_peer_list, tmp_size, list_size);
427 memcpy (tmp_peer_list, peer_list, list_size * sizeof (struct GNUNET_PeerIdentity));
428 peer = GNUNET_new (struct GNUNET_PeerIdentity);
433 * Choose the r_index of the peer we want to return
434 * at random from the interval of the gossip list
436 r_index = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_STRONG,
439 *peer = tmp_peer_list[r_index];
440 if (in_arr (tmp_peer_list, list_size, peer))
442 rem_from_list (tmp_peer_list, &tmp_size, peer);
448 } while (NULL == peer);
450 GNUNET_free (tmp_peer_list);
457 * Get the context of a peer. If not existing, create.
460 get_peer_ctx (struct GNUNET_CONTAINER_MultiPeerMap *peer_map,
461 const struct GNUNET_PeerIdentity *peer)
463 struct PeerContext *ctx;
465 if ( GNUNET_YES == GNUNET_CONTAINER_multipeermap_contains (peer_map, peer))
467 ctx = GNUNET_CONTAINER_multipeermap_get (peer_map, peer);
471 ctx = GNUNET_new (struct PeerContext);
474 ctx->send_channel = NULL;
475 ctx->recv_channel = NULL;
476 ctx->outstanding_ops = NULL;
477 ctx->num_outstanding_ops = 0;
478 (void) GNUNET_CONTAINER_multipeermap_put (peer_map, peer, ctx,
479 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
486 * Put random peer from sampler into the gossip list as history update.
489 hist_update (void *cls, struct GNUNET_PeerIdentity *ids, uint32_t num_peers)
491 GNUNET_assert (1 == num_peers);
493 if (gossip_list_size < sampler_size_est_need)
494 GNUNET_array_append (gossip_list, gossip_list_size, *ids);
496 if (0 < num_hist_update_tasks)
497 num_hist_update_tasks--;
502 * Callback that is called when a channel was effectively established.
503 * This is given to ntfy_tmt_rdy and called when the channel was
504 * successfully established.
507 peer_is_live (void *cls, size_t size, void *buf)
509 struct GNUNET_PeerIdentity *peer;
510 struct PeerContext *peer_ctx;
512 peer = (struct GNUNET_PeerIdentity *) cls;
513 peer_ctx = get_peer_ctx (peer_map, peer);
514 peer_ctx->peer_flags |= LIVING;
516 LOG (GNUNET_ERROR_TYPE_DEBUG, "Peer %s is live\n", GNUNET_i2s (peer));
518 if (0 != peer_ctx->num_outstanding_ops)
519 { /* Call outstanding operations */
522 for ( i = 0 ; i < peer_ctx->num_outstanding_ops ; i++ )
523 peer_ctx->outstanding_ops[i].op (peer_ctx->outstanding_ops[i].op_cls, peer);
524 GNUNET_array_grow (peer_ctx->outstanding_ops, peer_ctx->num_outstanding_ops, 0);
535 * Get the channel of a peer. If not existing, create.
537 struct GNUNET_CADET_Channel *
538 get_channel (struct GNUNET_CONTAINER_MultiPeerMap *peer_map,
539 const struct GNUNET_PeerIdentity *peer)
541 struct PeerContext *ctx;
542 struct GNUNET_PeerIdentity *tmp_peer;
544 ctx = get_peer_ctx (peer_map, peer);
545 if (NULL == ctx->send_channel)
547 ctx->send_channel = GNUNET_CADET_channel_create (cadet_handle, NULL, peer,
548 GNUNET_RPS_CADET_PORT,
549 GNUNET_CADET_OPTION_RELIABLE);
551 if (NULL == ctx->recv_channel)
553 tmp_peer = GNUNET_new (struct GNUNET_PeerIdentity);
555 ctx->is_live_task = GNUNET_CADET_notify_transmit_ready (ctx->send_channel, GNUNET_NO,
556 GNUNET_TIME_UNIT_FOREVER_REL,
557 0, peer_is_live, tmp_peer);
560 // do I have to explicitly put it in the peer_map?
561 (void) GNUNET_CONTAINER_multipeermap_put (peer_map, peer, ctx,
562 GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
564 return ctx->send_channel;
569 * Get the message queue of a specific peer.
571 * If we already have a message queue open to this client,
572 * simply return it, otherways create one.
574 struct GNUNET_MQ_Handle *
575 get_mq (struct GNUNET_CONTAINER_MultiPeerMap *peer_map,
576 const struct GNUNET_PeerIdentity *peer_id)
578 struct PeerContext *ctx;
580 ctx = get_peer_ctx (peer_map, peer_id);
583 (void) get_channel (peer_map, peer_id);
584 ctx->mq = GNUNET_CADET_mq_create (ctx->send_channel);
585 //do I have to explicitly put it in the peer_map?
586 (void) GNUNET_CONTAINER_multipeermap_put (peer_map, peer_id, ctx,
587 GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
594 * Sum all time relatives of an array.
596 struct GNUNET_TIME_Relative
597 T_relative_sum (const struct GNUNET_TIME_Relative *rel_array, uint32_t arr_size)
599 struct GNUNET_TIME_Relative sum;
602 sum = GNUNET_TIME_UNIT_ZERO;
603 for ( i = 0 ; i < arr_size ; i++ )
605 sum = GNUNET_TIME_relative_add (sum, rel_array[i]);
612 * Compute the average of given time relatives.
614 struct GNUNET_TIME_Relative
615 T_relative_avg (const struct GNUNET_TIME_Relative *rel_array, uint32_t arr_size)
617 return GNUNET_TIME_relative_divide (T_relative_sum (rel_array, arr_size), arr_size);
622 * Insert PeerID in #pull_list
624 * Called once we know a peer is live.
627 insert_in_pull_list (void *cls, const struct GNUNET_PeerIdentity *peer)
629 if (GNUNET_NO == in_arr (pull_list, pull_list_size, peer))
630 GNUNET_array_append (pull_list, pull_list_size, *peer);
634 * Check whether #insert_in_pull_list was already scheduled
637 insert_in_pull_list_scheduled (const struct PeerContext *peer_ctx)
641 for ( i = 0 ; i < peer_ctx->num_outstanding_ops ; i++ )
642 if (insert_in_pull_list == peer_ctx->outstanding_ops[i].op)
649 * Insert PeerID in #gossip_list
651 * Called once we know a peer is live.
654 insert_in_gossip_list (void *cls, const struct GNUNET_PeerIdentity *peer)
656 if (GNUNET_NO == in_arr (gossip_list, gossip_list_size, peer))
657 GNUNET_array_append (gossip_list, gossip_list_size, *peer);
661 * Check whether #insert_in_pull_list was already scheduled
664 insert_in_gossip_list_scheduled (const struct PeerContext *peer_ctx)
668 for ( i = 0 ; i < peer_ctx->num_outstanding_ops ; i++ )
669 if (insert_in_gossip_list == peer_ctx->outstanding_ops[i].op)
676 * Update sampler with given PeerID.
679 insert_in_sampler (void *cls, const struct GNUNET_PeerIdentity *peer)
681 RPS_sampler_update_list (peer);
686 * Check whether #insert_in_sampler was already scheduled
689 insert_in_sampler_scheduled (const struct PeerContext *peer_ctx)
693 for ( i = 0 ; i < peer_ctx->num_outstanding_ops ; i++ )
694 if (insert_in_sampler== peer_ctx->outstanding_ops[i].op)
701 * Wrapper around #RPS_sampler_resize()
706 uint32_t bigger_size;
710 if (sampler_size_est_need > sampler_size_client_need)
711 bigger_size = sampler_size_client_need;
713 bigger_size = sampler_size_est_need;
715 // TODO respect the min, max
716 if (sampler_size > bigger_size*4)
718 RPS_sampler_resize (sampler_size/2);
720 else if (sampler_size < bigger_size)
722 RPS_sampler_resize (sampler_size*2);
728 * Estimate request rate
730 * Called every time we receive a request from the client.
735 struct GNUNET_TIME_Relative max_round_duration;
737 if (request_deltas_size > req_counter)
739 if ( 1 < req_counter)
741 /* Shift last request deltas to the right */
742 memcpy (&request_deltas[1],
744 (req_counter - 1) * sizeof (struct GNUNET_TIME_Relative));
746 /* Add current delta to beginning */
747 request_deltas[0] = GNUNET_TIME_absolute_get_difference (last_request,
748 GNUNET_TIME_absolute_get ());
749 request_rate = T_relative_avg (request_deltas, req_counter);
751 /* Compute the duration a round will maximally take */
752 max_round_duration = GNUNET_TIME_relative_add (round_interval,
753 GNUNET_TIME_relative_divide (round_interval, 2));
755 /* Set the estimated size the sampler has to have to
756 * satisfy the current client request rate */
757 sampler_size_client_need = max_round_duration.rel_value_us / request_rate.rel_value_us;
759 /* Resize the sampler */
762 last_request = GNUNET_TIME_absolute_get ();
766 /***********************************************************************
768 ***********************************************************************/
771 * Function called by NSE.
773 * Updates sizes of sampler list and gossip list and adapt those lists
777 nse_callback (void *cls, struct GNUNET_TIME_Absolute timestamp, double logestimate, double std_dev)
780 //double scale; // TODO this might go gloabal/config
782 LOG (GNUNET_ERROR_TYPE_DEBUG,
783 "Received a ns estimate - logest: %f, std_dev: %f (old_size: %f)\n",
784 logestimate, std_dev, sampler_size);
786 estimate = GNUNET_NSE_log_estimate_to_n (logestimate);
787 // GNUNET_NSE_log_estimate_to_n (logestimate);
788 estimate = pow (estimate, 1./3);
789 // TODO add if std_dev is a number
790 // estimate += (std_dev * scale);
791 if ( 0 < estimate ) {
792 LOG (GNUNET_ERROR_TYPE_DEBUG, "Changing estimate to %f\n", estimate);
793 sampler_size_est_need = estimate;
795 LOG (GNUNET_ERROR_TYPE_DEBUG, "Not using estimate %f\n", estimate);
797 /* If the NSE has changed adapt the lists accordingly */
803 * Callback called once the requested PeerIDs are ready.
805 * Sends those to the requesting client.
807 void client_respond (void *cls,
808 struct GNUNET_PeerIdentity *ids, uint32_t num_peers)
810 LOG (GNUNET_ERROR_TYPE_DEBUG, "sampler returned %" PRIX32 " peers\n", num_peers);
811 struct GNUNET_MQ_Envelope *ev;
812 struct GNUNET_RPS_CS_ReplyMessage *out_msg;
813 struct GNUNET_SERVER_Client *client;
814 uint32_t size_needed;
815 struct client_ctx *cli_ctx;
817 client = (struct GNUNET_SERVER_Client *) cls;
819 size_needed = sizeof (struct GNUNET_RPS_CS_ReplyMessage) +
820 num_peers * sizeof (struct GNUNET_PeerIdentity);
822 GNUNET_assert (GNUNET_SERVER_MAX_MESSAGE_SIZE >= size_needed);
824 ev = GNUNET_MQ_msg_extra (out_msg,
825 num_peers * sizeof (struct GNUNET_PeerIdentity),
826 GNUNET_MESSAGE_TYPE_RPS_CS_REPLY);
827 out_msg->num_peers = htonl (num_peers);
831 num_peers * sizeof (struct GNUNET_PeerIdentity));
834 cli_ctx = GNUNET_SERVER_client_get_user_context (client, struct client_ctx);
835 if ( NULL == cli_ctx ) {
836 cli_ctx = GNUNET_new (struct client_ctx);
837 cli_ctx->mq = GNUNET_MQ_queue_for_server_client (client);
838 GNUNET_SERVER_client_set_user_context (client, cli_ctx);
841 GNUNET_MQ_send (cli_ctx->mq, ev);
846 * Handle RPS request from the client.
849 * @param client identification of the client
850 * @param message the actual message
853 handle_client_request (void *cls,
854 struct GNUNET_SERVER_Client *client,
855 const struct GNUNET_MessageHeader *message)
857 struct GNUNET_RPS_CS_RequestMessage *msg;
859 uint32_t size_needed;
862 msg = (struct GNUNET_RPS_CS_RequestMessage *) message;
864 num_peers = ntohl (msg->num_peers);
865 size_needed = sizeof (struct GNUNET_RPS_CS_ReplyMessage) +
866 num_peers * sizeof (struct GNUNET_PeerIdentity);
868 if (GNUNET_SERVER_MAX_MESSAGE_SIZE < size_needed)
870 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
874 for (i = 0 ; i < num_peers ; i++)
877 LOG (GNUNET_ERROR_TYPE_DEBUG, "Client requested %" PRIX32 " random peer(s).\n", num_peers);
879 RPS_sampler_get_n_rand_peers (client_respond, client, num_peers, GNUNET_YES);
881 GNUNET_SERVER_receive_done (client,
887 * Handle seed from the client.
890 * @param client identification of the client
891 * @param message the actual message
894 handle_client_seed (void *cls,
895 struct GNUNET_SERVER_Client *client,
896 const struct GNUNET_MessageHeader *message)
898 struct GNUNET_RPS_CS_SeedMessage *in_msg;
899 struct GNUNET_PeerIdentity *peers;
902 if (sizeof (struct GNUNET_RPS_CS_SeedMessage) < ntohs (message->size))
905 GNUNET_SERVER_receive_done (client,
908 in_msg = (struct GNUNET_RPS_CS_SeedMessage *) message;
909 if ((ntohs (message->size) - sizeof (struct GNUNET_RPS_CS_SeedMessage)) /
910 sizeof (struct GNUNET_PeerIdentity) != ntohl (in_msg->num_peers))
913 GNUNET_SERVER_receive_done (client,
917 in_msg = (struct GNUNET_RPS_CS_SeedMessage *) message;
918 peers = (struct GNUNET_PeerIdentity *) &message[1];
920 for ( i = 0 ; i < ntohl (in_msg->num_peers) ; i++ )
921 RPS_sampler_update_list (&peers[i]);
923 GNUNET_SERVER_receive_done (client,
929 * Handle a PUSH message from another peer.
931 * Check the proof of work and store the PeerID
932 * in the temporary list for pushed PeerIDs.
935 * @param channel The channel the PUSH was received over
936 * @param channel_ctx The context associated with this channel
937 * @param msg The message header
940 handle_peer_push (void *cls,
941 struct GNUNET_CADET_Channel *channel,
943 const struct GNUNET_MessageHeader *msg)
945 const struct GNUNET_PeerIdentity *peer;
947 // (check the proof of work)
949 peer = (const struct GNUNET_PeerIdentity *) GNUNET_CADET_channel_get_info (channel, GNUNET_CADET_OPTION_PEER);
950 // FIXME wait for cadet to change this function
951 LOG (GNUNET_ERROR_TYPE_DEBUG, "PUSH received (%s)\n", GNUNET_i2s (peer));
953 /* Add the sending peer to the push_list */
954 if (GNUNET_NO == in_arr (push_list, pull_list_size, peer))
955 GNUNET_array_append (push_list, push_list_size, *peer);
961 * Handle PULL REQUEST request message from another peer.
963 * Reply with the gossip list of PeerIDs.
966 * @param channel The channel the PUSH was received over
967 * @param channel_ctx The context associated with this channel
968 * @param msg The message header
971 handle_peer_pull_request (void *cls,
972 struct GNUNET_CADET_Channel *channel,
974 const struct GNUNET_MessageHeader *msg)
976 struct GNUNET_PeerIdentity *peer;
978 struct GNUNET_MQ_Handle *mq;
979 struct GNUNET_MQ_Envelope *ev;
980 struct GNUNET_RPS_P2P_PullReplyMessage *out_msg;
983 peer = (struct GNUNET_PeerIdentity *) GNUNET_CADET_channel_get_info (channel,
984 GNUNET_CADET_OPTION_PEER);
985 // FIXME wait for cadet to change this function
987 /* Compute actual size */
988 send_size = sizeof (struct GNUNET_RPS_P2P_PullReplyMessage) +
989 gossip_list_size * sizeof (struct GNUNET_PeerIdentity);
991 if (GNUNET_CONSTANTS_MAX_CADET_MESSAGE_SIZE < send_size)
992 /* Compute number of peers to send
993 * If too long, simply truncate */
994 send_size = (GNUNET_CONSTANTS_MAX_CADET_MESSAGE_SIZE -
995 sizeof (struct GNUNET_RPS_P2P_PullReplyMessage)) /
996 sizeof (struct GNUNET_PeerIdentity);
998 send_size = gossip_list_size;
1000 LOG (GNUNET_ERROR_TYPE_DEBUG,
1001 "PULL REQUEST from peer %s received, going to send %u peers\n",
1002 GNUNET_i2s (peer), send_size);
1004 mq = get_mq (peer_map, peer);
1006 ev = GNUNET_MQ_msg_extra (out_msg,
1007 send_size * sizeof (struct GNUNET_PeerIdentity),
1008 GNUNET_MESSAGE_TYPE_RPS_PP_PULL_REPLY);
1009 //out_msg->num_peers = htonl (gossip_list_size);
1010 out_msg->num_peers = htonl (send_size);
1011 memcpy (&out_msg[1], gossip_list,
1012 send_size * sizeof (struct GNUNET_PeerIdentity));
1014 GNUNET_MQ_send (mq, ev);
1020 * Handle PULL REPLY message from another peer.
1022 * Check whether we sent a corresponding request and
1023 * whether this reply is the first one.
1025 * @param cls Closure
1026 * @param channel The channel the PUSH was received over
1027 * @param channel_ctx The context associated with this channel
1028 * @param msg The message header
1031 handle_peer_pull_reply (void *cls,
1032 struct GNUNET_CADET_Channel *channel,
1034 const struct GNUNET_MessageHeader *msg)
1036 LOG (GNUNET_ERROR_TYPE_DEBUG, "PULL REPLY received\n");
1038 struct GNUNET_RPS_P2P_PullReplyMessage *in_msg;
1039 struct GNUNET_PeerIdentity *peers;
1040 struct PeerContext *peer_ctx;
1041 struct GNUNET_PeerIdentity *sender;
1042 struct PeerContext *sender_ctx;
1043 struct PeerOutstandingOp out_op;
1046 if (sizeof (struct GNUNET_RPS_P2P_PullReplyMessage) > ntohs (msg->size))
1048 GNUNET_break_op (0); // At the moment our own implementation seems to break that.
1049 return GNUNET_SYSERR;
1051 in_msg = (struct GNUNET_RPS_P2P_PullReplyMessage *) msg;
1052 if ((ntohs (msg->size) - sizeof (struct GNUNET_RPS_P2P_PullReplyMessage)) / sizeof (struct GNUNET_PeerIdentity) != ntohl (in_msg->num_peers))
1054 LOG (GNUNET_ERROR_TYPE_ERROR, "message says it sends %" PRIu64 " peers, have space for %i peers\n",
1055 ntohl (in_msg->num_peers),
1056 (ntohs (msg->size) - sizeof (struct GNUNET_RPS_P2P_PullReplyMessage)) / sizeof (struct GNUNET_PeerIdentity));
1057 GNUNET_break_op (0);
1058 return GNUNET_SYSERR;
1061 sender = (struct GNUNET_PeerIdentity *) GNUNET_CADET_channel_get_info (
1062 (struct GNUNET_CADET_Channel *) channel, GNUNET_CADET_OPTION_PEER);
1063 // Guess simply casting isn't the nicest way...
1064 // FIXME wait for cadet to change this function
1065 sender_ctx = get_peer_ctx (peer_map, sender);
1067 if (0 == (peer_ctx->peer_flags || PULL_REPLY_PENDING))
1069 GNUNET_break_op (0);
1073 peers = (struct GNUNET_PeerIdentity *) &msg[1];
1074 for ( i = 0 ; i < ntohl (in_msg->num_peers) ; i++ )
1076 peer_ctx = get_peer_ctx (peer_map, &peers[i]);
1077 if ((0 != (peer_ctx->peer_flags && LIVING)) ||
1078 NULL != peer_ctx->recv_channel)
1080 if (GNUNET_NO == in_arr (pull_list, pull_list_size, &peers[i]))
1081 GNUNET_array_append (pull_list, pull_list_size, peers[i]);
1083 else if (GNUNET_NO == insert_in_pull_list_scheduled (peer_ctx))
1085 out_op.op = insert_in_pull_list;
1086 GNUNET_array_append (peer_ctx->outstanding_ops, peer_ctx->num_outstanding_ops, out_op);
1090 sender_ctx->peer_flags &= (~PULL_REPLY_PENDING);
1091 rem_from_list (pending_pull_reply_list, &pending_pull_reply_list_size, sender);
1098 * Send out PUSHes and PULLs.
1100 * This is executed regylary.
1103 do_round (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1105 LOG (GNUNET_ERROR_TYPE_DEBUG, "Going to execute next round\n");
1108 unsigned int *permut;
1109 unsigned int n_peers; /* Number of peers we send pushes/pulls to */
1110 struct GNUNET_MQ_Envelope *ev;
1111 const struct GNUNET_PeerIdentity *peer;
1112 struct GNUNET_MQ_Handle *mq;
1114 // TODO log lists, ...
1117 /* Would it make sense to have one shuffeled gossip list and then
1118 * to send PUSHes to first alpha peers, PULL requests to next beta peers and
1119 * use the rest to update sampler?
1120 * in essence get random peers with consumption */
1123 if (0 < gossip_list_size)
1125 permut = GNUNET_CRYPTO_random_permute (GNUNET_CRYPTO_QUALITY_STRONG,
1126 (unsigned int) gossip_list_size);
1127 if (0 != gossip_list_size)
1129 n_peers = round (alpha * gossip_list_size);
1132 LOG (GNUNET_ERROR_TYPE_DEBUG, "Going to send pushes to %u (%f * %u) peers.\n",
1133 n_peers, alpha, gossip_list_size);
1134 for ( i = 0 ; i < n_peers ; i++ )
1136 peer = &gossip_list[permut[i]];
1137 if (own_identity != peer) // TODO
1138 { // FIXME if this fails schedule/loop this for later
1139 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending PUSH to peer %s of gossiped list.\n", GNUNET_i2s (peer));
1141 ev = GNUNET_MQ_msg_header (GNUNET_MESSAGE_TYPE_RPS_PP_PUSH);
1142 mq = get_mq (peer_map, peer);
1143 GNUNET_MQ_send (mq, ev);
1150 /* Send PULL requests */
1151 //permut = GNUNET_CRYPTO_random_permute (GNUNET_CRYPTO_QUALITY_STRONG, (unsigned int) sampler_list->size);
1152 if (0 != gossip_list_size)
1154 n_peers = round (beta * gossip_list_size);
1157 LOG (GNUNET_ERROR_TYPE_DEBUG, "Going to send pulls to %u (%f * %u) peers.\n",
1158 n_peers, beta, gossip_list_size);
1159 for ( i = 0 ; i < n_peers ; i++ )
1161 peer = get_rand_peer_ignore_list (gossip_list, gossip_list_size,
1162 pending_pull_reply_list, pending_pull_reply_list_size);
1165 GNUNET_array_append (pending_pull_reply_list, pending_pull_reply_list_size, *peer);
1167 if (own_identity != peer)
1168 { // FIXME if this fails schedule/loop this for later
1169 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending PULL request to peer %s of gossiped list.\n", GNUNET_i2s (peer));
1171 ev = GNUNET_MQ_msg_header (GNUNET_MESSAGE_TYPE_RPS_PP_PULL_REQUEST);
1173 mq = get_mq (peer_map, peer);
1174 GNUNET_MQ_send (mq, ev);
1181 /* Update gossip list */
1184 if ( push_list_size <= alpha * gossip_list_size &&
1185 push_list_size != 0 &&
1186 pull_list_size != 0 )
1188 LOG (GNUNET_ERROR_TYPE_DEBUG, "Update of the gossip list.\n");
1190 uint32_t first_border;
1191 uint32_t second_border;
1193 first_border = round (alpha * sampler_size_est_need);
1194 second_border = first_border + round (beta * sampler_size_est_need);
1196 GNUNET_array_grow (gossip_list, gossip_list_size, second_border);
1198 for ( i = 0 ; i < first_border ; i++ )
1199 { // TODO use RPS_sampler_get_n_rand_peers
1200 /* Update gossip list with peers received through PUSHes */
1201 r_index = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_STRONG,
1203 gossip_list[i] = push_list[r_index];
1204 // TODO change the peer_flags accordingly
1207 for ( i = first_border ; i < second_border ; i++ )
1209 /* Update gossip list with peers received through PULLs */
1210 r_index = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_STRONG,
1212 gossip_list[i] = pull_list[r_index];
1213 // TODO change the peer_flags accordingly
1216 for ( i = second_border ; i < gossip_list_size ; i++ )
1218 /* Update gossip list with peers from history */
1219 RPS_sampler_get_n_rand_peers (hist_update, NULL, 1, GNUNET_NO);
1220 num_hist_update_tasks++;
1221 // TODO change the peer_flags accordingly
1227 LOG (GNUNET_ERROR_TYPE_DEBUG, "No update of the gossip list. ()\n");
1229 // TODO independent of that also get some peers from CADET_get_peers()?
1232 /* Update samplers */
1234 for ( i = 0 ; i < push_list_size ; i++ )
1236 RPS_sampler_update_list (&push_list[i]);
1237 // TODO set in_flag?
1240 for ( i = 0 ; i < pull_list_size ; i++ )
1242 RPS_sampler_update_list (&pull_list[i]);
1243 // TODO set in_flag?
1247 /* Empty push/pull lists */
1248 GNUNET_array_grow (push_list, push_list_size, 0);
1249 GNUNET_array_grow (pull_list, pull_list_size, 0);
1251 struct GNUNET_TIME_Relative time_next_round;
1252 struct GNUNET_TIME_Relative half_round_interval;
1253 unsigned int rand_delay;
1255 /* Compute random time value between .5 * round_interval and 1.5 *round_interval */
1256 half_round_interval = GNUNET_TIME_relative_divide (round_interval, 2);
1260 * Compute random value between (0 and 1) * round_interval
1261 * via multiplying round_interval with a 'fraction' (0 to value)/value
1263 rand_delay = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, UINT_MAX/10);
1264 time_next_round = GNUNET_TIME_relative_multiply (round_interval, rand_delay);
1265 time_next_round = GNUNET_TIME_relative_divide (time_next_round, UINT_MAX/10);
1266 time_next_round = GNUNET_TIME_relative_add (time_next_round, half_round_interval);
1267 } while (GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us == time_next_round.rel_value_us);
1269 /* Schedule next round */
1270 do_round_task = GNUNET_SCHEDULER_add_delayed (round_interval, &do_round, NULL);
1271 LOG (GNUNET_ERROR_TYPE_DEBUG, "Finished round\n");
1276 * Open a connection to given peer and store channel and mq.
1279 insertCB (void *cls, const struct GNUNET_PeerIdentity *id)
1281 // We open a channel to be notified when this peer goes down.
1282 (void) get_channel (peer_map, id);
1287 * Close the connection to given peer and delete channel and mq.
1290 removeCB (void *cls, const struct GNUNET_PeerIdentity *id)
1293 struct PeerContext *ctx;
1295 s = RPS_sampler_count_id (id);
1298 if (GNUNET_YES == GNUNET_CONTAINER_multipeermap_contains (peer_map, id))
1300 ctx = GNUNET_CONTAINER_multipeermap_get (peer_map, id);
1301 if (NULL != ctx->send_channel)
1303 if (NULL != ctx->mq)
1305 GNUNET_MQ_destroy (ctx->mq);
1307 // may already be freed at shutdown of cadet
1308 //GNUNET_CADET_channel_destroy (ctx->send_channel);
1310 // TODO cleanup peer
1311 (void) GNUNET_CONTAINER_multipeermap_remove_all (peer_map, id);
1317 rps_start (struct GNUNET_SERVER_Handle *server);
1320 * This is called from GNUNET_CADET_get_peers().
1322 * It is called on every peer(ID) that cadet somehow has contact with.
1323 * We use those to initialise the sampler.
1326 init_peer_cb (void *cls,
1327 const struct GNUNET_PeerIdentity *peer,
1328 int tunnel, // "Do we have a tunnel towards this peer?"
1329 unsigned int n_paths, // "Number of known paths towards this peer"
1330 unsigned int best_path) // "How long is the best path?
1331 // (0 = unknown, 1 = ourselves, 2 = neighbor)"
1333 struct GNUNET_SERVER_Handle *server;
1334 struct PeerOutstandingOp out_op;
1335 struct PeerContext *peer_ctx;
1337 server = (struct GNUNET_SERVER_Handle *) cls;
1340 LOG (GNUNET_ERROR_TYPE_DEBUG,
1341 "Got peer %s (at %p) from CADET (gossip_list_size: %u)\n",
1342 GNUNET_i2s (peer), peer, gossip_list_size);
1344 // maybe create a function for that
1345 peer_ctx = get_peer_ctx (peer_map, peer);
1346 if (GNUNET_NO == insert_in_sampler_scheduled (peer_ctx))
1348 out_op.op = insert_in_sampler;
1349 GNUNET_array_append (peer_ctx->outstanding_ops, peer_ctx->num_outstanding_ops, out_op);
1352 if (GNUNET_NO == insert_in_gossip_list_scheduled (peer_ctx))
1354 out_op.op = insert_in_gossip_list;
1355 GNUNET_array_append (peer_ctx->outstanding_ops, peer_ctx->num_outstanding_ops, out_op);
1358 /* Issue livelyness test on peer */
1359 (void) get_channel (peer_map, peer);
1361 // send push/pull to each of those peers?
1369 * Callback used to clean the multipeermap.
1372 peer_remove_cb (void *cls, const struct GNUNET_PeerIdentity *key, void *value)
1374 struct PeerContext *peer_ctx;
1376 peer_ctx = (struct PeerContext *) value;
1378 if ( NULL != peer_ctx->mq)
1379 GNUNET_MQ_destroy (peer_ctx->mq);
1381 if ( NULL != peer_ctx->is_live_task)
1382 GNUNET_CADET_notify_transmit_ready_cancel (peer_ctx->is_live_task);
1384 if ( NULL != peer_ctx->send_channel)
1385 GNUNET_CADET_channel_destroy (peer_ctx->send_channel);
1387 if ( NULL != peer_ctx->recv_channel)
1388 GNUNET_CADET_channel_destroy (peer_ctx->recv_channel);
1390 if (GNUNET_NO == GNUNET_CONTAINER_multipeermap_remove_all (peer_map, key))
1391 LOG (GNUNET_ERROR_TYPE_WARNING, "removing peer from peer_map failed\n");
1398 * Task run during shutdown.
1404 shutdown_task (void *cls,
1405 const struct GNUNET_SCHEDULER_TaskContext *tc)
1407 LOG (GNUNET_ERROR_TYPE_DEBUG, "RPS is going down\n");
1409 if ( NULL != do_round_task )
1411 GNUNET_SCHEDULER_cancel (do_round_task);
1412 do_round_task = NULL;
1416 if (GNUNET_SYSERR == GNUNET_CONTAINER_multipeermap_iterate (peer_map, peer_remove_cb, NULL))
1417 LOG (GNUNET_ERROR_TYPE_WARNING,
1418 "Iterating over peers to disconnect from them was cancelled\n");
1420 GNUNET_CONTAINER_multipeermap_destroy (peer_map);
1422 GNUNET_NSE_disconnect (nse);
1423 GNUNET_CADET_disconnect (cadet_handle);
1424 GNUNET_free (own_identity);
1425 RPS_sampler_destroy ();
1426 GNUNET_array_grow (request_deltas, request_deltas_size, 0);
1427 GNUNET_array_grow (gossip_list, gossip_list_size, 0);
1428 GNUNET_array_grow (push_list, push_list_size, 0);
1429 GNUNET_array_grow (pull_list, pull_list_size, 0);
1434 * A client disconnected. Remove all of its data structure entries.
1436 * @param cls closure, NULL
1437 * @param client identification of the client
1440 handle_client_disconnect (void *cls,
1441 struct GNUNET_SERVER_Client * client)
1447 * Handle the channel a peer opens to us.
1449 * @param cls The closure
1450 * @param channel The channel the peer wants to establish
1451 * @param initiator The peer's peer ID
1452 * @param port The port the channel is being established over
1453 * @param options Further options
1456 handle_inbound_channel (void *cls,
1457 struct GNUNET_CADET_Channel *channel,
1458 const struct GNUNET_PeerIdentity *initiator,
1460 enum GNUNET_CADET_ChannelOption options)
1462 struct PeerContext *ctx;
1464 LOG (GNUNET_ERROR_TYPE_DEBUG,
1465 "New channel was established to us (Peer %s).\n",
1466 GNUNET_i2s (initiator));
1468 GNUNET_assert (NULL != channel);
1470 // we might not even store the recv_channel
1472 ctx = get_peer_ctx (peer_map, initiator);
1473 if (NULL != ctx->recv_channel)
1475 ctx->recv_channel = channel;
1478 ctx->peer_flags |= LIVING;
1480 //ctx->peer_flags = IN_OTHER_GOSSIP_LIST;
1483 (void) GNUNET_CONTAINER_multipeermap_put (peer_map, initiator, ctx,
1484 GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
1486 return NULL; // TODO
1491 * This is called when a remote peer destroys a channel.
1493 * @param cls The closure
1494 * @param channel The channel being closed
1495 * @param channel_ctx The context associated with this channel
1498 cleanup_channel (void *cls,
1499 const struct GNUNET_CADET_Channel *channel,
1502 struct GNUNET_PeerIdentity *peer;
1503 struct PeerContext *peer_ctx;
1505 LOG (GNUNET_ERROR_TYPE_DEBUG, "Channel to remote peer was destroyed.\n");
1507 peer = (struct GNUNET_PeerIdentity *) GNUNET_CADET_channel_get_info (
1508 (struct GNUNET_CADET_Channel *) channel, GNUNET_CADET_OPTION_PEER);
1509 // Guess simply casting isn't the nicest way...
1510 // FIXME wait for cadet to change this function
1511 RPS_sampler_reinitialise_by_value (peer);
1513 peer_ctx = GNUNET_CONTAINER_multipeermap_get (peer_map, peer);
1514 /* Somwewhat {ab,re}use the iterator function */
1515 (void) peer_remove_cb (peer, peer, peer_ctx);
1520 * Actually start the service.
1523 rps_start (struct GNUNET_SERVER_Handle *server)
1525 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
1526 {&handle_client_request, NULL, GNUNET_MESSAGE_TYPE_RPS_CS_REQUEST,
1527 sizeof (struct GNUNET_RPS_CS_RequestMessage)},
1528 {&handle_client_seed, NULL, GNUNET_MESSAGE_TYPE_RPS_CS_SEED, 0},
1532 GNUNET_SERVER_add_handlers (server, handlers);
1533 GNUNET_SERVER_disconnect_notify (server,
1534 &handle_client_disconnect,
1536 LOG (GNUNET_ERROR_TYPE_DEBUG, "Ready to receive requests from clients\n");
1539 num_hist_update_tasks = 0;
1541 do_round_task = GNUNET_SCHEDULER_add_now (&do_round, NULL);
1542 LOG (GNUNET_ERROR_TYPE_DEBUG, "Scheduled first round\n");
1544 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
1551 * Process statistics requests.
1553 * @param cls closure
1554 * @param server the initialized server
1555 * @param c configuration to use
1559 struct GNUNET_SERVER_Handle *server,
1560 const struct GNUNET_CONFIGURATION_Handle *c)
1562 // TODO check what this does -- copied from gnunet-boss
1563 // - seems to work as expected
1564 GNUNET_log_setup ("rps", GNUNET_error_type_to_string (GNUNET_ERROR_TYPE_DEBUG), NULL);
1566 LOG (GNUNET_ERROR_TYPE_DEBUG, "RPS started\n");
1573 own_identity = GNUNET_new (struct GNUNET_PeerIdentity);
1574 GNUNET_CRYPTO_get_peer_identity (cfg, own_identity); // TODO check return value
1575 GNUNET_assert (NULL != own_identity);
1576 LOG (GNUNET_ERROR_TYPE_DEBUG, "Own identity is %s (at %p).\n", GNUNET_i2s (own_identity), own_identity);
1579 /* Get time interval from the configuration */
1580 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_time (cfg, "RPS",
1584 LOG (GNUNET_ERROR_TYPE_DEBUG, "Failed to read ROUNDINTERVAL from config\n");
1585 GNUNET_SCHEDULER_shutdown ();
1589 /* Get initial size of sampler/gossip list from the configuration */
1590 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (cfg, "RPS",
1592 (long long unsigned int *) &sampler_size_est_need))
1594 LOG (GNUNET_ERROR_TYPE_DEBUG, "Failed to read INITSIZE from config\n");
1595 GNUNET_SCHEDULER_shutdown ();
1598 LOG (GNUNET_ERROR_TYPE_DEBUG, "INITSIZE is %" PRIu64 "\n", sampler_size_est_need);
1604 /* connect to NSE */
1605 nse = GNUNET_NSE_connect (cfg, nse_callback, NULL);
1606 // TODO check whether that was successful
1607 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connected to NSE\n");
1613 peer_map = GNUNET_CONTAINER_multipeermap_create (sampler_size_est_need, GNUNET_NO);
1616 /* Initialise cadet */
1617 static const struct GNUNET_CADET_MessageHandler cadet_handlers[] = {
1618 {&handle_peer_push , GNUNET_MESSAGE_TYPE_RPS_PP_PUSH ,
1619 sizeof (struct GNUNET_MessageHeader)},
1620 {&handle_peer_pull_request, GNUNET_MESSAGE_TYPE_RPS_PP_PULL_REQUEST,
1621 sizeof (struct GNUNET_MessageHeader)},
1622 {&handle_peer_pull_reply , GNUNET_MESSAGE_TYPE_RPS_PP_PULL_REPLY , 0},
1626 const uint32_t ports[] = {GNUNET_RPS_CADET_PORT, 0}; // _PORT specified in src/rps/rps.h
1627 cadet_handle = GNUNET_CADET_connect (cfg,
1629 &handle_inbound_channel,
1633 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connected to CADET\n");
1636 /* Initialise sampler */
1637 struct GNUNET_TIME_Relative half_round_interval;
1638 struct GNUNET_TIME_Relative max_round_interval;
1640 half_round_interval = GNUNET_TIME_relative_multiply (round_interval, .5);
1641 max_round_interval = GNUNET_TIME_relative_add (round_interval, half_round_interval);
1643 RPS_sampler_init (sampler_size_est_need, max_round_interval,
1644 insertCB, NULL, removeCB, NULL);
1645 sampler_size = sampler_size_est_need;
1647 /* Initialise push and pull maps */
1652 pending_pull_reply_list = NULL;
1653 pending_pull_reply_list_size = 0;
1656 LOG (GNUNET_ERROR_TYPE_DEBUG, "Requesting peers from CADET\n");
1657 GNUNET_CADET_get_peers (cadet_handle, &init_peer_cb, server);
1659 // TODO send push/pull to each of those peers?
1664 * The main function for the rps service.
1666 * @param argc number of arguments from the command line
1667 * @param argv command line arguments
1668 * @return 0 ok, 1 on error
1671 main (int argc, char *const *argv)
1673 return (GNUNET_OK ==
1674 GNUNET_SERVICE_run (argc,
1677 GNUNET_SERVICE_OPTION_NONE,
1678 &run, NULL)) ? 0 : 1;
1681 /* end of gnunet-service-rps.c */