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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 * Identity of the peer
175 struct GNUNET_PeerIdentity peer_id;
178 * This is pobably followed by 'statistical' data (when we first saw
179 * him, how did we get his ID, how many pushes (in a timeinterval),
184 /***********************************************************************
185 * /Housekeeping with peers
186 ***********************************************************************/
188 /***********************************************************************
190 ***********************************************************************/
193 * Set of all peers to keep track of them.
195 static struct GNUNET_CONTAINER_MultiPeerMap *peer_map;
199 * The gossiped list of peers.
201 static struct GNUNET_PeerIdentity *gossip_list;
204 * Size of the gossiped list
206 //static unsigned int gossip_list_size;
207 static uint32_t gossip_list_size;
211 * The size of sampler we need to be able to satisfy the client's need of
214 static unsigned int sampler_size_client_need;
217 * The size of sampler we need to be able to satisfy the Brahms protocol's
218 * need of random peers.
220 * This is directly taken as the #gossip_list_size on update of the
223 * This is one minimum size the sampler grows to.
225 static unsigned int sampler_size_est_need;
229 * Percentage of total peer number in the gossip list
230 * to send random PUSHes to
235 * Percentage of total peer number in the gossip list
236 * to send random PULLs to
241 * The percentage gamma of history updates.
242 * Simply 1 - alpha - beta
247 * Identifier for the main task that runs periodically.
249 static struct GNUNET_SCHEDULER_Task *do_round_task;
252 * Time inverval the do_round task runs in.
254 static struct GNUNET_TIME_Relative round_interval;
259 * List to store peers received through pushes temporary.
261 * TODO -> multipeermap
263 static struct GNUNET_PeerIdentity *push_list;
266 * Size of the push_list;
268 static unsigned int push_list_size;
269 //size_t push_list_size;
272 * List to store peers received through pulls temporary.
274 * TODO -> multipeermap
276 static struct GNUNET_PeerIdentity *pull_list;
279 * Size of the pull_list;
281 static unsigned int pull_list_size;
282 //size_t pull_list_size;
288 static struct GNUNET_NSE_Handle *nse;
293 static struct GNUNET_CADET_Handle *cadet_handle;
299 * Only needed in the beginning to check how many of the 64 deltas
302 static unsigned int req_counter;
305 * Time of the last request we received.
307 * Used to compute the expected request rate.
309 static struct GNUNET_TIME_Absolute last_request;
312 * Size of #request_deltas.
314 #define REQUEST_DELTAS_SIZE 64
315 static unsigned int request_deltas_size = REQUEST_DELTAS_SIZE;
318 * Last 64 deltas between requests
320 static struct GNUNET_TIME_Relative request_deltas[REQUEST_DELTAS_SIZE];
323 * The prediction of the rate of requests
325 static struct GNUNET_TIME_Relative request_rate;
329 * List with the peers we sent requests to.
331 struct GNUNET_PeerIdentity *pending_pull_reply_list;
334 * Size of #pending_pull_reply_list.
336 uint32_t pending_pull_reply_list_size;
340 * Number of history update tasks.
342 uint32_t num_hist_update_tasks;
345 /***********************************************************************
347 ***********************************************************************/
350 /***********************************************************************
352 ***********************************************************************/
355 * Check if peer is already in peer array.
358 in_arr (const struct GNUNET_PeerIdentity *array,
359 unsigned int arr_size,
360 const struct GNUNET_PeerIdentity *peer)
362 GNUNET_assert (NULL != peer);
367 GNUNET_assert (NULL != array);
372 while (0 != GNUNET_CRYPTO_cmp_peer_identity (&array[i], peer) &&
383 * Remove peer from list.
386 rem_from_list (struct GNUNET_PeerIdentity *peer_list,
387 unsigned int *list_size,
388 const struct GNUNET_PeerIdentity *peer)
392 for ( i = 0 ; i < *list_size ; i++ )
394 if (0 == GNUNET_CRYPTO_cmp_peer_identity (&peer_list[i], peer))
396 if (i < *list_size -1)
397 { /* Not at the last entry -- shift peers left */
398 memcpy (&peer_list[i], &peer_list[i +1],
399 (*list_size - i -1) * sizeof (struct GNUNET_PeerIdentity));
401 /* Remove last entry (should be now useless PeerID) */
402 GNUNET_array_grow (peer_list, *list_size, *list_size -1);
408 * Get random peer from the given list but don't return one from the @a ignore_list.
410 struct GNUNET_PeerIdentity *
411 get_rand_peer_ignore_list (const struct GNUNET_PeerIdentity *peer_list,
413 const struct GNUNET_PeerIdentity *ignore_list,
414 uint32_t ignore_size)
418 struct GNUNET_PeerIdentity *tmp_peer_list;
419 struct GNUNET_PeerIdentity *peer;
421 GNUNET_assert (NULL != peer_list);
424 tmp_peer_list = NULL;
425 GNUNET_array_grow (tmp_peer_list, tmp_size, list_size);
426 memcpy (tmp_peer_list, peer_list, list_size * sizeof (struct GNUNET_PeerIdentity));
427 peer = GNUNET_new (struct GNUNET_PeerIdentity);
432 * Choose the r_index of the peer we want to return
433 * at random from the interval of the gossip list
435 r_index = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_STRONG,
438 *peer = tmp_peer_list[r_index];
439 if (in_arr (tmp_peer_list, list_size, peer))
441 rem_from_list (tmp_peer_list, &tmp_size, peer);
447 } while (NULL == peer);
449 GNUNET_free (tmp_peer_list);
456 * Get the context of a peer. If not existing, create.
459 get_peer_ctx (struct GNUNET_CONTAINER_MultiPeerMap *peer_map,
460 const struct GNUNET_PeerIdentity *peer)
462 struct PeerContext *ctx;
464 if ( GNUNET_YES == GNUNET_CONTAINER_multipeermap_contains (peer_map, peer))
466 ctx = GNUNET_CONTAINER_multipeermap_get (peer_map, peer);
470 ctx = GNUNET_new (struct PeerContext);
473 ctx->send_channel = NULL;
474 ctx->recv_channel = NULL;
475 ctx->outstanding_ops = NULL;
476 ctx->num_outstanding_ops = 0;
477 (void) GNUNET_CONTAINER_multipeermap_put (peer_map, peer, ctx,
478 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
485 * Put random peer from sampler into the gossip list as history update.
488 hist_update (void *cls, struct GNUNET_PeerIdentity *ids, uint32_t num_peers)
490 GNUNET_assert (1 == num_peers);
492 if (gossip_list_size < sampler_size_est_need)
493 GNUNET_array_append (gossip_list, gossip_list_size, *ids);
495 if (0 < num_hist_update_tasks)
496 num_hist_update_tasks--;
501 * Callback that is called when a channel was effectively established.
502 * This is given to ntfy_tmt_rdy and called when the channel was
503 * successfully established.
506 peer_is_live (void *cls, size_t size, void *buf)
508 struct PeerContext *ctx = cls;
509 struct GNUNET_PeerIdentity *peer;
510 struct PeerContext *peer_ctx;
516 ctx->is_live_task = NULL;
517 peer = &ctx->peer_id;
518 peer_ctx = get_peer_ctx (peer_map, peer);
519 peer_ctx->peer_flags |= LIVING;
521 LOG (GNUNET_ERROR_TYPE_DEBUG, "Peer %s is live\n", GNUNET_i2s (peer));
523 if (0 != peer_ctx->num_outstanding_ops)
524 { /* Call outstanding operations */
527 for ( i = 0 ; i < peer_ctx->num_outstanding_ops ; i++ )
528 peer_ctx->outstanding_ops[i].op (peer_ctx->outstanding_ops[i].op_cls, peer);
529 GNUNET_array_grow (peer_ctx->outstanding_ops, peer_ctx->num_outstanding_ops, 0);
532 //if (NULL != peer_ctx->is_live_task)
534 // GNUNET_CADET_notify_transmit_ready_cancel (peer_ctx->is_live_task);
535 // peer_ctx->is_live_task = NULL; // needed?
542 * Get the channel of a peer. If not existing, create.
544 struct GNUNET_CADET_Channel *
545 get_channel (struct GNUNET_CONTAINER_MultiPeerMap *peer_map,
546 const struct GNUNET_PeerIdentity *peer)
548 struct PeerContext *ctx;
550 ctx = get_peer_ctx (peer_map, peer);
551 if (NULL == ctx->send_channel)
553 ctx->send_channel = GNUNET_CADET_channel_create (cadet_handle, NULL, peer,
554 GNUNET_RPS_CADET_PORT,
555 GNUNET_CADET_OPTION_RELIABLE);
557 if (NULL == ctx->recv_channel)
559 ctx->peer_id = *peer;
561 GNUNET_CADET_notify_transmit_ready (ctx->send_channel, GNUNET_NO,
562 GNUNET_TIME_UNIT_FOREVER_REL,
563 sizeof (struct GNUNET_MessageHeader),
567 // do I have to explicitly put it in the peer_map?
568 (void) GNUNET_CONTAINER_multipeermap_put (peer_map, peer, ctx,
569 GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
571 return ctx->send_channel;
576 * Get the message queue of a specific peer.
578 * If we already have a message queue open to this client,
579 * simply return it, otherways create one.
581 struct GNUNET_MQ_Handle *
582 get_mq (struct GNUNET_CONTAINER_MultiPeerMap *peer_map,
583 const struct GNUNET_PeerIdentity *peer_id)
585 struct PeerContext *ctx;
587 ctx = get_peer_ctx (peer_map, peer_id);
590 (void) get_channel (peer_map, peer_id);
591 ctx->mq = GNUNET_CADET_mq_create (ctx->send_channel);
592 //do I have to explicitly put it in the peer_map?
593 (void) GNUNET_CONTAINER_multipeermap_put (peer_map, peer_id, ctx,
594 GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
601 * Sum all time relatives of an array.
603 struct GNUNET_TIME_Relative
604 T_relative_sum (const struct GNUNET_TIME_Relative *rel_array, uint32_t arr_size)
606 struct GNUNET_TIME_Relative sum;
609 sum = GNUNET_TIME_UNIT_ZERO;
610 for ( i = 0 ; i < arr_size ; i++ )
612 sum = GNUNET_TIME_relative_add (sum, rel_array[i]);
619 * Compute the average of given time relatives.
621 struct GNUNET_TIME_Relative
622 T_relative_avg (const struct GNUNET_TIME_Relative *rel_array, uint32_t arr_size)
624 return GNUNET_TIME_relative_divide (T_relative_sum (rel_array, arr_size), arr_size);
629 * Insert PeerID in #pull_list
631 * Called once we know a peer is live.
634 insert_in_pull_list (void *cls, const struct GNUNET_PeerIdentity *peer)
636 if (GNUNET_NO == in_arr (pull_list, pull_list_size, peer))
637 GNUNET_array_append (pull_list, pull_list_size, *peer);
641 * Check whether #insert_in_pull_list was already scheduled
644 insert_in_pull_list_scheduled (const struct PeerContext *peer_ctx)
648 for ( i = 0 ; i < peer_ctx->num_outstanding_ops ; i++ )
649 if (insert_in_pull_list == peer_ctx->outstanding_ops[i].op)
656 * Insert PeerID in #gossip_list
658 * Called once we know a peer is live.
661 insert_in_gossip_list (void *cls, const struct GNUNET_PeerIdentity *peer)
663 if (GNUNET_NO == in_arr (gossip_list, gossip_list_size, peer))
664 GNUNET_array_append (gossip_list, gossip_list_size, *peer);
668 * Check whether #insert_in_pull_list was already scheduled
671 insert_in_gossip_list_scheduled (const struct PeerContext *peer_ctx)
675 for ( i = 0 ; i < peer_ctx->num_outstanding_ops ; i++ )
676 if (insert_in_gossip_list == peer_ctx->outstanding_ops[i].op)
683 * Update sampler with given PeerID.
686 insert_in_sampler (void *cls, const struct GNUNET_PeerIdentity *peer)
688 RPS_sampler_update_list (peer);
693 * Check whether #insert_in_sampler was already scheduled
696 insert_in_sampler_scheduled (const struct PeerContext *peer_ctx)
700 for ( i = 0 ; i < peer_ctx->num_outstanding_ops ; i++ )
701 if (insert_in_sampler== peer_ctx->outstanding_ops[i].op)
708 * Wrapper around #RPS_sampler_resize()
713 uint32_t bigger_size;
714 unsigned int sampler_size;
718 if (sampler_size_est_need > sampler_size_client_need)
719 bigger_size = sampler_size_est_need;
721 bigger_size = sampler_size_client_need;
723 // TODO respect the min, max
724 sampler_size = RPS_sampler_get_size ();
725 if (sampler_size > bigger_size * 4)
727 RPS_sampler_resize (sampler_size / 2);
729 else if (sampler_size < bigger_size)
731 RPS_sampler_resize (sampler_size * 2);
733 LOG (GNUNET_ERROR_TYPE_DEBUG, "sampler_size is now %u\n", sampler_size);
738 * Estimate request rate
740 * Called every time we receive a request from the client.
745 struct GNUNET_TIME_Relative max_round_duration;
747 if (request_deltas_size > req_counter)
749 if ( 1 < req_counter)
751 /* Shift last request deltas to the right */
752 memcpy (&request_deltas[1],
754 (req_counter - 1) * sizeof (struct GNUNET_TIME_Relative));
756 /* Add current delta to beginning */
758 GNUNET_TIME_absolute_get_difference (last_request,
759 GNUNET_TIME_absolute_get ());
760 request_rate = T_relative_avg (request_deltas, req_counter);
762 /* Compute the duration a round will maximally take */
764 GNUNET_TIME_relative_add (round_interval,
765 GNUNET_TIME_relative_divide (round_interval, 2));
767 /* Set the estimated size the sampler has to have to
768 * satisfy the current client request rate */
769 sampler_size_client_need =
770 max_round_duration.rel_value_us / request_rate.rel_value_us;
772 /* Resize the sampler */
775 last_request = GNUNET_TIME_absolute_get ();
779 /***********************************************************************
781 ***********************************************************************/
784 * Function called by NSE.
786 * Updates sizes of sampler list and gossip list and adapt those lists
790 nse_callback (void *cls, struct GNUNET_TIME_Absolute timestamp,
791 double logestimate, double std_dev)
794 //double scale; // TODO this might go gloabal/config
796 LOG (GNUNET_ERROR_TYPE_DEBUG,
797 "Received a ns estimate - logest: %f, std_dev: %f (old_size: %u)\n",
798 logestimate, std_dev, RPS_sampler_get_size ());
800 estimate = GNUNET_NSE_log_estimate_to_n (logestimate);
801 // GNUNET_NSE_log_estimate_to_n (logestimate);
802 estimate = pow (estimate, 1.0 / 3);
803 // TODO add if std_dev is a number
804 // estimate += (std_dev * scale);
805 if (0 < ceil (estimate))
807 LOG (GNUNET_ERROR_TYPE_DEBUG, "Changing estimate to %f\n", estimate);
808 sampler_size_est_need = estimate;
810 LOG (GNUNET_ERROR_TYPE_DEBUG, "Not using estimate %f\n", estimate);
812 /* If the NSE has changed adapt the lists accordingly */
818 * Callback called once the requested PeerIDs are ready.
820 * Sends those to the requesting client.
822 void client_respond (void *cls,
823 struct GNUNET_PeerIdentity *ids, uint32_t num_peers)
825 LOG (GNUNET_ERROR_TYPE_DEBUG, "sampler returned %" PRIX32 " peers\n", num_peers);
826 struct GNUNET_MQ_Envelope *ev;
827 struct GNUNET_RPS_CS_ReplyMessage *out_msg;
828 struct GNUNET_SERVER_Client *client;
829 uint32_t size_needed;
830 struct client_ctx *cli_ctx;
832 client = (struct GNUNET_SERVER_Client *) cls;
834 size_needed = sizeof (struct GNUNET_RPS_CS_ReplyMessage) +
835 num_peers * sizeof (struct GNUNET_PeerIdentity);
837 GNUNET_assert (GNUNET_SERVER_MAX_MESSAGE_SIZE >= size_needed);
839 ev = GNUNET_MQ_msg_extra (out_msg,
840 num_peers * sizeof (struct GNUNET_PeerIdentity),
841 GNUNET_MESSAGE_TYPE_RPS_CS_REPLY);
842 out_msg->num_peers = htonl (num_peers);
846 num_peers * sizeof (struct GNUNET_PeerIdentity));
849 cli_ctx = GNUNET_SERVER_client_get_user_context (client, struct client_ctx);
850 if ( NULL == cli_ctx ) {
851 cli_ctx = GNUNET_new (struct client_ctx);
852 cli_ctx->mq = GNUNET_MQ_queue_for_server_client (client);
853 GNUNET_SERVER_client_set_user_context (client, cli_ctx);
856 GNUNET_MQ_send (cli_ctx->mq, ev);
861 * Handle RPS request from the client.
864 * @param client identification of the client
865 * @param message the actual message
868 handle_client_request (void *cls,
869 struct GNUNET_SERVER_Client *client,
870 const struct GNUNET_MessageHeader *message)
872 struct GNUNET_RPS_CS_RequestMessage *msg;
874 uint32_t size_needed;
877 msg = (struct GNUNET_RPS_CS_RequestMessage *) message;
879 num_peers = ntohl (msg->num_peers);
880 size_needed = sizeof (struct GNUNET_RPS_CS_ReplyMessage) +
881 num_peers * sizeof (struct GNUNET_PeerIdentity);
883 if (GNUNET_SERVER_MAX_MESSAGE_SIZE < size_needed)
885 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
889 for (i = 0 ; i < num_peers ; i++)
892 LOG (GNUNET_ERROR_TYPE_DEBUG, "Client requested %" PRIX32 " random peer(s).\n", num_peers);
894 RPS_sampler_get_n_rand_peers (client_respond, client, num_peers, GNUNET_YES);
896 GNUNET_SERVER_receive_done (client,
902 * Handle seed from the client.
905 * @param client identification of the client
906 * @param message the actual message
909 handle_client_seed (void *cls,
910 struct GNUNET_SERVER_Client *client,
911 const struct GNUNET_MessageHeader *message)
913 struct GNUNET_RPS_CS_SeedMessage *in_msg;
914 struct GNUNET_PeerIdentity *peers;
917 if (sizeof (struct GNUNET_RPS_CS_SeedMessage) < ntohs (message->size))
920 GNUNET_SERVER_receive_done (client,
923 in_msg = (struct GNUNET_RPS_CS_SeedMessage *) message;
924 if ((ntohs (message->size) - sizeof (struct GNUNET_RPS_CS_SeedMessage)) /
925 sizeof (struct GNUNET_PeerIdentity) != ntohl (in_msg->num_peers))
928 GNUNET_SERVER_receive_done (client,
932 in_msg = (struct GNUNET_RPS_CS_SeedMessage *) message;
933 peers = (struct GNUNET_PeerIdentity *) &message[1];
935 for ( i = 0 ; i < ntohl (in_msg->num_peers) ; i++ )
936 RPS_sampler_update_list (&peers[i]);
938 GNUNET_SERVER_receive_done (client,
944 * Handle a PUSH message from another peer.
946 * Check the proof of work and store the PeerID
947 * in the temporary list for pushed PeerIDs.
950 * @param channel The channel the PUSH was received over
951 * @param channel_ctx The context associated with this channel
952 * @param msg The message header
955 handle_peer_push (void *cls,
956 struct GNUNET_CADET_Channel *channel,
958 const struct GNUNET_MessageHeader *msg)
960 const struct GNUNET_PeerIdentity *peer;
962 // (check the proof of work)
964 peer = (const struct GNUNET_PeerIdentity *) GNUNET_CADET_channel_get_info (channel, GNUNET_CADET_OPTION_PEER);
965 // FIXME wait for cadet to change this function
966 LOG (GNUNET_ERROR_TYPE_DEBUG, "PUSH received (%s)\n", GNUNET_i2s (peer));
968 /* Add the sending peer to the push_list */
969 if (GNUNET_NO == in_arr (push_list, pull_list_size, peer))
970 GNUNET_array_append (push_list, push_list_size, *peer);
976 * Handle PULL REQUEST request message from another peer.
978 * Reply with the gossip list of PeerIDs.
981 * @param channel The channel the PUSH was received over
982 * @param channel_ctx The context associated with this channel
983 * @param msg The message header
986 handle_peer_pull_request (void *cls,
987 struct GNUNET_CADET_Channel *channel,
989 const struct GNUNET_MessageHeader *msg)
991 struct GNUNET_PeerIdentity *peer;
993 struct GNUNET_MQ_Handle *mq;
994 struct GNUNET_MQ_Envelope *ev;
995 struct GNUNET_RPS_P2P_PullReplyMessage *out_msg;
998 peer = (struct GNUNET_PeerIdentity *) GNUNET_CADET_channel_get_info (channel,
999 GNUNET_CADET_OPTION_PEER);
1000 // FIXME wait for cadet to change this function
1002 /* Compute actual size */
1003 send_size = sizeof (struct GNUNET_RPS_P2P_PullReplyMessage) +
1004 gossip_list_size * sizeof (struct GNUNET_PeerIdentity);
1006 if (GNUNET_CONSTANTS_MAX_CADET_MESSAGE_SIZE < send_size)
1007 /* Compute number of peers to send
1008 * If too long, simply truncate */
1009 send_size = (GNUNET_CONSTANTS_MAX_CADET_MESSAGE_SIZE -
1010 sizeof (struct GNUNET_RPS_P2P_PullReplyMessage)) /
1011 sizeof (struct GNUNET_PeerIdentity);
1013 send_size = gossip_list_size;
1015 LOG (GNUNET_ERROR_TYPE_DEBUG,
1016 "PULL REQUEST from peer %s received, going to send %u peers\n",
1017 GNUNET_i2s (peer), send_size);
1019 mq = get_mq (peer_map, peer);
1021 ev = GNUNET_MQ_msg_extra (out_msg,
1022 send_size * sizeof (struct GNUNET_PeerIdentity),
1023 GNUNET_MESSAGE_TYPE_RPS_PP_PULL_REPLY);
1024 //out_msg->num_peers = htonl (gossip_list_size);
1025 out_msg->num_peers = htonl (send_size);
1026 memcpy (&out_msg[1], gossip_list,
1027 send_size * sizeof (struct GNUNET_PeerIdentity));
1029 GNUNET_MQ_send (mq, ev);
1035 * Handle PULL REPLY message from another peer.
1037 * Check whether we sent a corresponding request and
1038 * whether this reply is the first one.
1040 * @param cls Closure
1041 * @param channel The channel the PUSH was received over
1042 * @param channel_ctx The context associated with this channel
1043 * @param msg The message header
1046 handle_peer_pull_reply (void *cls,
1047 struct GNUNET_CADET_Channel *channel,
1049 const struct GNUNET_MessageHeader *msg)
1051 LOG (GNUNET_ERROR_TYPE_DEBUG, "PULL REPLY received\n");
1053 struct GNUNET_RPS_P2P_PullReplyMessage *in_msg;
1054 struct GNUNET_PeerIdentity *peers;
1055 struct PeerContext *peer_ctx;
1056 struct GNUNET_PeerIdentity *sender;
1057 struct PeerContext *sender_ctx;
1058 struct PeerOutstandingOp out_op;
1061 if (sizeof (struct GNUNET_RPS_P2P_PullReplyMessage) > ntohs (msg->size))
1063 GNUNET_break_op (0); // At the moment our own implementation seems to break that.
1064 return GNUNET_SYSERR;
1066 in_msg = (struct GNUNET_RPS_P2P_PullReplyMessage *) msg;
1067 if ((ntohs (msg->size) - sizeof (struct GNUNET_RPS_P2P_PullReplyMessage)) / sizeof (struct GNUNET_PeerIdentity) != ntohl (in_msg->num_peers))
1069 LOG (GNUNET_ERROR_TYPE_ERROR, "message says it sends %" PRIu64 " peers, have space for %i peers\n",
1070 ntohl (in_msg->num_peers),
1071 (ntohs (msg->size) - sizeof (struct GNUNET_RPS_P2P_PullReplyMessage)) / sizeof (struct GNUNET_PeerIdentity));
1072 GNUNET_break_op (0);
1073 return GNUNET_SYSERR;
1076 sender = (struct GNUNET_PeerIdentity *) GNUNET_CADET_channel_get_info (
1077 (struct GNUNET_CADET_Channel *) channel, GNUNET_CADET_OPTION_PEER);
1078 // Guess simply casting isn't the nicest way...
1079 // FIXME wait for cadet to change this function
1080 sender_ctx = get_peer_ctx (peer_map, sender);
1082 if (0 == (peer_ctx->peer_flags || PULL_REPLY_PENDING))
1084 GNUNET_break_op (0);
1088 peers = (struct GNUNET_PeerIdentity *) &msg[1];
1089 for ( i = 0 ; i < ntohl (in_msg->num_peers) ; i++ )
1091 peer_ctx = get_peer_ctx (peer_map, &peers[i]);
1092 if ((0 != (peer_ctx->peer_flags && LIVING)) ||
1093 NULL != peer_ctx->recv_channel)
1095 if (GNUNET_NO == in_arr (pull_list, pull_list_size, &peers[i]))
1096 GNUNET_array_append (pull_list, pull_list_size, peers[i]);
1098 else if (GNUNET_NO == insert_in_pull_list_scheduled (peer_ctx))
1100 out_op.op = insert_in_pull_list;
1101 GNUNET_array_append (peer_ctx->outstanding_ops, peer_ctx->num_outstanding_ops, out_op);
1105 sender_ctx->peer_flags &= (~PULL_REPLY_PENDING);
1106 rem_from_list (pending_pull_reply_list, &pending_pull_reply_list_size, sender);
1113 * Send out PUSHes and PULLs.
1115 * This is executed regylary.
1118 do_round (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1120 LOG (GNUNET_ERROR_TYPE_DEBUG, "Going to execute next round\n");
1123 unsigned int *permut;
1124 unsigned int n_peers; /* Number of peers we send pushes/pulls to */
1125 struct GNUNET_MQ_Envelope *ev;
1126 const struct GNUNET_PeerIdentity *peer;
1127 struct GNUNET_MQ_Handle *mq;
1129 // TODO log lists, ...
1132 /* Would it make sense to have one shuffeled gossip list and then
1133 * to send PUSHes to first alpha peers, PULL requests to next beta peers and
1134 * use the rest to update sampler?
1135 * in essence get random peers with consumption */
1138 if (0 < gossip_list_size)
1140 permut = GNUNET_CRYPTO_random_permute (GNUNET_CRYPTO_QUALITY_STRONG,
1141 (unsigned int) gossip_list_size);
1142 if (0 != gossip_list_size)
1144 n_peers = round (alpha * gossip_list_size);
1147 LOG (GNUNET_ERROR_TYPE_DEBUG, "Going to send pushes to %u (%f * %u) peers.\n",
1148 n_peers, alpha, gossip_list_size);
1149 for ( i = 0 ; i < n_peers ; i++ )
1151 peer = &gossip_list[permut[i]];
1152 if (0 != GNUNET_CRYPTO_cmp_peer_identity (&own_identity, peer)) // TODO
1153 { // FIXME if this fails schedule/loop this for later
1154 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending PUSH to peer %s of gossiped list.\n", GNUNET_i2s (peer));
1156 ev = GNUNET_MQ_msg_header (GNUNET_MESSAGE_TYPE_RPS_PP_PUSH);
1157 mq = get_mq (peer_map, peer);
1158 GNUNET_MQ_send (mq, ev);
1162 GNUNET_free (permut);
1166 /* Send PULL requests */
1167 //permut = GNUNET_CRYPTO_random_permute (GNUNET_CRYPTO_QUALITY_STRONG, (unsigned int) sampler_list->size);
1168 if (0 != gossip_list_size)
1170 n_peers = round (beta * gossip_list_size);
1173 LOG (GNUNET_ERROR_TYPE_DEBUG, "Going to send pulls to %u (%f * %u) peers.\n",
1174 n_peers, beta, gossip_list_size);
1175 for ( i = 0 ; i < n_peers ; i++ )
1177 peer = get_rand_peer_ignore_list (gossip_list, gossip_list_size,
1178 pending_pull_reply_list, pending_pull_reply_list_size);
1181 GNUNET_array_append (pending_pull_reply_list, pending_pull_reply_list_size, *peer);
1183 if (0 != GNUNET_CRYPTO_cmp_peer_identity (&own_identity, peer))
1184 { // FIXME if this fails schedule/loop this for later
1185 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending PULL request to peer %s of gossiped list.\n", GNUNET_i2s (peer));
1187 ev = GNUNET_MQ_msg_header (GNUNET_MESSAGE_TYPE_RPS_PP_PULL_REQUEST);
1189 mq = get_mq (peer_map, peer);
1190 GNUNET_MQ_send (mq, ev);
1197 /* Update gossip list */
1200 if ( push_list_size <= alpha * gossip_list_size &&
1201 push_list_size != 0 &&
1202 pull_list_size != 0 )
1204 LOG (GNUNET_ERROR_TYPE_DEBUG, "Update of the gossip list.\n");
1206 uint32_t first_border;
1207 uint32_t second_border;
1209 first_border = ceil (alpha * sampler_size_est_need);
1210 second_border = first_border + ceil (beta * sampler_size_est_need);
1212 GNUNET_array_grow (gossip_list, gossip_list_size, second_border);
1214 for ( i = 0 ; i < first_border ; i++ )
1215 { // TODO use RPS_sampler_get_n_rand_peers
1216 /* Update gossip list with peers received through PUSHes */
1217 r_index = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_STRONG,
1219 gossip_list[i] = push_list[r_index];
1220 // TODO change the peer_flags accordingly
1223 for ( i = first_border ; i < second_border ; i++ )
1225 /* Update gossip list with peers received through PULLs */
1226 r_index = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_STRONG,
1228 gossip_list[i] = pull_list[r_index];
1229 // TODO change the peer_flags accordingly
1232 for ( i = second_border ; i < gossip_list_size ; i++ )
1234 /* Update gossip list with peers from history */
1235 RPS_sampler_get_n_rand_peers (hist_update, NULL, 1, GNUNET_NO);
1236 num_hist_update_tasks++;
1237 // TODO change the peer_flags accordingly
1243 LOG (GNUNET_ERROR_TYPE_DEBUG, "No update of the gossip list. ()\n");
1245 // TODO independent of that also get some peers from CADET_get_peers()?
1248 /* Update samplers */
1250 for ( i = 0 ; i < push_list_size ; i++ )
1252 RPS_sampler_update_list (&push_list[i]);
1253 // TODO set in_flag?
1256 for ( i = 0 ; i < pull_list_size ; i++ )
1258 RPS_sampler_update_list (&pull_list[i]);
1259 // TODO set in_flag?
1263 /* Empty push/pull lists */
1264 GNUNET_array_grow (push_list, push_list_size, 0);
1265 GNUNET_array_grow (pull_list, pull_list_size, 0);
1267 struct GNUNET_TIME_Relative time_next_round;
1268 struct GNUNET_TIME_Relative half_round_interval;
1269 unsigned int rand_delay;
1271 /* Compute random time value between .5 * round_interval and 1.5 *round_interval */
1272 half_round_interval = GNUNET_TIME_relative_divide (round_interval, 2);
1276 * Compute random value between (0 and 1) * round_interval
1277 * via multiplying round_interval with a 'fraction' (0 to value)/value
1279 rand_delay = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, UINT_MAX/10);
1280 time_next_round = GNUNET_TIME_relative_multiply (round_interval, rand_delay);
1281 time_next_round = GNUNET_TIME_relative_divide (time_next_round, UINT_MAX/10);
1282 time_next_round = GNUNET_TIME_relative_add (time_next_round, half_round_interval);
1283 } while (GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us == time_next_round.rel_value_us);
1285 /* Schedule next round */
1286 do_round_task = GNUNET_SCHEDULER_add_delayed (round_interval, &do_round, NULL);
1287 LOG (GNUNET_ERROR_TYPE_DEBUG, "Finished round\n");
1292 * Open a connection to given peer and store channel and mq.
1295 insertCB (void *cls, const struct GNUNET_PeerIdentity *id)
1297 // We open a channel to be notified when this peer goes down.
1298 (void) get_channel (peer_map, id);
1303 * Close the connection to given peer and delete channel and mq.
1306 removeCB (void *cls, const struct GNUNET_PeerIdentity *id)
1309 struct PeerContext *ctx;
1311 s = RPS_sampler_count_id (id);
1314 if (GNUNET_YES == GNUNET_CONTAINER_multipeermap_contains (peer_map, id))
1316 ctx = GNUNET_CONTAINER_multipeermap_get (peer_map, id);
1317 if (NULL != ctx->send_channel)
1319 if (NULL != ctx->mq)
1321 GNUNET_MQ_destroy (ctx->mq);
1323 // may already be freed at shutdown of cadet
1324 //GNUNET_CADET_channel_destroy (ctx->send_channel);
1326 // TODO cleanup peer
1327 (void) GNUNET_CONTAINER_multipeermap_remove_all (peer_map, id);
1333 rps_start (struct GNUNET_SERVER_Handle *server);
1336 * This is called from GNUNET_CADET_get_peers().
1338 * It is called on every peer(ID) that cadet somehow has contact with.
1339 * We use those to initialise the sampler.
1342 init_peer_cb (void *cls,
1343 const struct GNUNET_PeerIdentity *peer,
1344 int tunnel, // "Do we have a tunnel towards this peer?"
1345 unsigned int n_paths, // "Number of known paths towards this peer"
1346 unsigned int best_path) // "How long is the best path?
1347 // (0 = unknown, 1 = ourselves, 2 = neighbor)"
1349 struct GNUNET_SERVER_Handle *server;
1350 struct PeerOutstandingOp out_op;
1351 struct PeerContext *peer_ctx;
1353 server = (struct GNUNET_SERVER_Handle *) cls;
1356 LOG (GNUNET_ERROR_TYPE_DEBUG,
1357 "Got peer %s (at %p) from CADET (gossip_list_size: %u)\n",
1358 GNUNET_i2s (peer), peer, gossip_list_size);
1360 // maybe create a function for that
1361 peer_ctx = get_peer_ctx (peer_map, peer);
1362 if (GNUNET_NO == insert_in_sampler_scheduled (peer_ctx))
1364 out_op.op = insert_in_sampler;
1365 GNUNET_array_append (peer_ctx->outstanding_ops, peer_ctx->num_outstanding_ops, out_op);
1368 if (GNUNET_NO == insert_in_gossip_list_scheduled (peer_ctx))
1370 out_op.op = insert_in_gossip_list;
1371 GNUNET_array_append (peer_ctx->outstanding_ops, peer_ctx->num_outstanding_ops, out_op);
1374 /* Issue livelyness test on peer */
1375 (void) get_channel (peer_map, peer);
1377 // send push/pull to each of those peers?
1385 * Callback used to clean the multipeermap.
1388 peer_remove_cb (void *cls, const struct GNUNET_PeerIdentity *key, void *value)
1390 struct PeerContext *peer_ctx;
1391 const struct GNUNET_CADET_Channel *ch = (const struct GNUNET_CADET_Channel *) cls;
1392 struct GNUNET_CADET_Channel *recv;
1393 struct GNUNET_CADET_Channel *send;
1395 peer_ctx = (struct PeerContext *) value;
1397 if (NULL != peer_ctx->mq)
1398 GNUNET_MQ_destroy (peer_ctx->mq);
1400 if (NULL != peer_ctx->is_live_task)
1402 GNUNET_CADET_notify_transmit_ready_cancel (peer_ctx->is_live_task);
1403 peer_ctx->is_live_task = NULL;
1406 send = peer_ctx->send_channel;
1407 peer_ctx->send_channel = NULL;
1408 recv = peer_ctx->send_channel;
1409 peer_ctx->recv_channel = NULL;
1414 GNUNET_CADET_channel_destroy (send);
1420 GNUNET_CADET_channel_destroy (recv);
1423 if (GNUNET_NO == GNUNET_CONTAINER_multipeermap_remove_all (peer_map, key))
1424 LOG (GNUNET_ERROR_TYPE_WARNING, "removing peer from peer_map failed\n");
1426 GNUNET_free (peer_ctx);
1433 * Task run during shutdown.
1439 shutdown_task (void *cls,
1440 const struct GNUNET_SCHEDULER_TaskContext *tc)
1442 LOG (GNUNET_ERROR_TYPE_DEBUG, "RPS is going down\n");
1444 if ( NULL != do_round_task )
1446 GNUNET_SCHEDULER_cancel (do_round_task);
1447 do_round_task = NULL;
1452 if (GNUNET_SYSERR == GNUNET_CONTAINER_multipeermap_iterate (peer_map, peer_remove_cb, NULL))
1453 LOG (GNUNET_ERROR_TYPE_WARNING,
1454 "Iterating over peers to disconnect from them was cancelled\n");
1457 GNUNET_NSE_disconnect (nse);
1458 GNUNET_CADET_disconnect (cadet_handle);
1459 RPS_sampler_destroy ();
1460 GNUNET_break (0 == GNUNET_CONTAINER_multipeermap_size (peer_map));
1461 GNUNET_CONTAINER_multipeermap_destroy (peer_map);
1462 GNUNET_array_grow (gossip_list, gossip_list_size, 0);
1463 GNUNET_array_grow (push_list, push_list_size, 0);
1464 GNUNET_array_grow (pull_list, pull_list_size, 0);
1469 * A client disconnected. Remove all of its data structure entries.
1471 * @param cls closure, NULL
1472 * @param client identification of the client
1475 handle_client_disconnect (void *cls,
1476 struct GNUNET_SERVER_Client * client)
1482 * Handle the channel a peer opens to us.
1484 * @param cls The closure
1485 * @param channel The channel the peer wants to establish
1486 * @param initiator The peer's peer ID
1487 * @param port The port the channel is being established over
1488 * @param options Further options
1491 handle_inbound_channel (void *cls,
1492 struct GNUNET_CADET_Channel *channel,
1493 const struct GNUNET_PeerIdentity *initiator,
1495 enum GNUNET_CADET_ChannelOption options)
1497 struct PeerContext *ctx;
1499 LOG (GNUNET_ERROR_TYPE_DEBUG,
1500 "New channel was established to us (Peer %s).\n",
1501 GNUNET_i2s (initiator));
1503 GNUNET_assert (NULL != channel);
1505 // we might not even store the recv_channel
1507 ctx = get_peer_ctx (peer_map, initiator);
1508 if (NULL != ctx->recv_channel)
1510 ctx->recv_channel = channel;
1513 ctx->peer_flags |= LIVING;
1515 //ctx->peer_flags = IN_OTHER_GOSSIP_LIST;
1518 (void) GNUNET_CONTAINER_multipeermap_put (peer_map, initiator, ctx,
1519 GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
1521 return NULL; // TODO
1526 * This is called when a remote peer destroys a channel.
1528 * @param cls The closure
1529 * @param channel The channel being closed
1530 * @param channel_ctx The context associated with this channel
1533 cleanup_channel (void *cls,
1534 const struct GNUNET_CADET_Channel *channel,
1537 struct GNUNET_PeerIdentity *peer;
1538 struct PeerContext *peer_ctx;
1540 peer = (struct GNUNET_PeerIdentity *) GNUNET_CADET_channel_get_info (
1541 (struct GNUNET_CADET_Channel *) channel, GNUNET_CADET_OPTION_PEER);
1542 // Guess simply casting isn't the nicest way...
1543 // FIXME wait for cadet to change this function
1544 LOG (GNUNET_ERROR_TYPE_DEBUG, "Cleaning up channel to peer %s\n",
1547 RPS_sampler_reinitialise_by_value (peer);
1549 if (GNUNET_YES == GNUNET_CONTAINER_multipeermap_contains (peer_map, peer))
1551 peer_ctx = GNUNET_CONTAINER_multipeermap_get (peer_map, peer);
1553 if (NULL == peer_ctx) /* It could have been removed by shutdown_task */
1556 /* Somwewhat {ab,re}use the iterator function */
1557 /* Cast to void is ok, because it's used as void in peer_remove_cb */
1558 (void) peer_remove_cb ((void *) channel, peer, peer_ctx);
1564 * Actually start the service.
1567 rps_start (struct GNUNET_SERVER_Handle *server)
1569 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
1570 {&handle_client_request, NULL, GNUNET_MESSAGE_TYPE_RPS_CS_REQUEST,
1571 sizeof (struct GNUNET_RPS_CS_RequestMessage)},
1572 {&handle_client_seed, NULL, GNUNET_MESSAGE_TYPE_RPS_CS_SEED, 0},
1576 GNUNET_SERVER_add_handlers (server, handlers);
1577 GNUNET_SERVER_disconnect_notify (server,
1578 &handle_client_disconnect,
1580 LOG (GNUNET_ERROR_TYPE_DEBUG, "Ready to receive requests from clients\n");
1583 num_hist_update_tasks = 0;
1585 do_round_task = GNUNET_SCHEDULER_add_now (&do_round, NULL);
1586 LOG (GNUNET_ERROR_TYPE_DEBUG, "Scheduled first round\n");
1588 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
1595 * Process statistics requests.
1597 * @param cls closure
1598 * @param server the initialized server
1599 * @param c configuration to use
1603 struct GNUNET_SERVER_Handle *server,
1604 const struct GNUNET_CONFIGURATION_Handle *c)
1606 // TODO check what this does -- copied from gnunet-boss
1607 // - seems to work as expected
1608 GNUNET_log_setup ("rps", GNUNET_error_type_to_string (GNUNET_ERROR_TYPE_DEBUG), NULL);
1613 GNUNET_CRYPTO_get_peer_identity (cfg, &own_identity); // TODO check return value
1614 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1615 "STARTING SERVICE (rps) for peer [%s]\n",
1616 GNUNET_i2s (&own_identity));
1619 /* Get time interval from the configuration */
1620 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_time (cfg, "RPS",
1624 LOG (GNUNET_ERROR_TYPE_DEBUG, "Failed to read ROUNDINTERVAL from config\n");
1625 GNUNET_SCHEDULER_shutdown ();
1629 /* Get initial size of sampler/gossip list from the configuration */
1630 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (cfg, "RPS",
1632 (long long unsigned int *) &sampler_size_est_need))
1634 LOG (GNUNET_ERROR_TYPE_DEBUG, "Failed to read INITSIZE from config\n");
1635 GNUNET_SCHEDULER_shutdown ();
1638 LOG (GNUNET_ERROR_TYPE_DEBUG, "INITSIZE is %" PRIu64 "\n", sampler_size_est_need);
1644 /* connect to NSE */
1645 nse = GNUNET_NSE_connect (cfg, nse_callback, NULL);
1646 // TODO check whether that was successful
1647 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connected to NSE\n");
1653 peer_map = GNUNET_CONTAINER_multipeermap_create (sampler_size_est_need, GNUNET_NO);
1656 /* Initialise cadet */
1657 static const struct GNUNET_CADET_MessageHandler cadet_handlers[] = {
1658 {&handle_peer_push , GNUNET_MESSAGE_TYPE_RPS_PP_PUSH ,
1659 sizeof (struct GNUNET_MessageHeader)},
1660 {&handle_peer_pull_request, GNUNET_MESSAGE_TYPE_RPS_PP_PULL_REQUEST,
1661 sizeof (struct GNUNET_MessageHeader)},
1662 {&handle_peer_pull_reply , GNUNET_MESSAGE_TYPE_RPS_PP_PULL_REPLY , 0},
1666 const uint32_t ports[] = {GNUNET_RPS_CADET_PORT, 0}; // _PORT specified in src/rps/rps.h
1667 cadet_handle = GNUNET_CADET_connect (cfg,
1669 &handle_inbound_channel,
1673 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connected to CADET\n");
1676 /* Initialise sampler */
1677 struct GNUNET_TIME_Relative half_round_interval;
1678 struct GNUNET_TIME_Relative max_round_interval;
1680 half_round_interval = GNUNET_TIME_relative_multiply (round_interval, .5);
1681 max_round_interval = GNUNET_TIME_relative_add (round_interval, half_round_interval);
1683 RPS_sampler_init (sampler_size_est_need, max_round_interval,
1684 insertCB, NULL, removeCB, NULL);
1686 /* Initialise push and pull maps */
1691 pending_pull_reply_list = NULL;
1692 pending_pull_reply_list_size = 0;
1695 LOG (GNUNET_ERROR_TYPE_DEBUG, "Requesting peers from CADET\n");
1696 GNUNET_CADET_get_peers (cadet_handle, &init_peer_cb, server);
1698 // TODO send push/pull to each of those peers?
1703 * The main function for the rps service.
1705 * @param argc number of arguments from the command line
1706 * @param argv command line arguments
1707 * @return 0 ok, 1 on error
1710 main (int argc, char *const *argv)
1712 return (GNUNET_OK ==
1713 GNUNET_SERVICE_run (argc,
1716 GNUNET_SERVICE_OPTION_NONE,
1717 &run, NULL)) ? 0 : 1;
1720 /* end of gnunet-service-rps.c */