/* This file is part of GNUnet. (C) GNUnet is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GNUnet is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNUnet; see the file COPYING. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /** * @file rps/gnunet-service-rps.c * @brief rps service implementation * @author Julius Bünger */ #include "platform.h" #include "gnunet_util_lib.h" #include "gnunet_cadet_service.h" #include "gnunet_nse_service.h" #include "rps.h" #include "gnunet-service-rps_sampler.h" #include #include #define LOG(kind, ...) GNUNET_log(kind, __VA_ARGS__) // TODO modify @brief in every file // TODO take care that messages are not longer than 64k // TODO check for overflows // TODO align message structs // (TODO api -- possibility of getting weak random peer immideately) // TODO malicious peer // TODO Change API to accept initialisation peers // TODO Change API to accept good peers 'friends' // TODO store peers somewhere // TODO check that every id we get is valid - is it reachable? // hist_size_init, hist_size_max /** * Our configuration. */ static const struct GNUNET_CONFIGURATION_Handle *cfg; /** * Our own identity. */ static struct GNUNET_PeerIdentity *own_identity; /** * Closure to the callback cadet calls on each peer it passes to us */ struct init_peer_cls { /** * The server handle to later listen to client requests */ struct GNUNET_SERVER_Handle *server; /** * Counts how many peers cadet already passed to us */ uint32_t i; }; struct GNUNET_PeerIdentity * get_rand_peer (const struct GNUNET_PeerIdentity *peer_list, unsigned int size); /*********************************************************************** * Housekeeping with peers ***********************************************************************/ /** * Struct used to store the context of a connected client. */ struct client_ctx { /** * The message queue to communicate with the client. */ struct GNUNET_MQ_Handle *mq; }; /** * Used to keep track in what lists single peerIDs are. */ enum in_list_flag // probably unneeded { in_other_sampler_list = 0x1, in_other_gossip_list = 0x2, // unneeded? in_own_sampler_list = 0x4, in_own_gossip_list = 0x8 // unneeded? }; /** * Struct used to keep track of other peer's status * * This is stored in a multipeermap. */ struct peer_context { /** * In own gossip/sampler list, in other's gossip/sampler list */ uint32_t in_flags; // unneeded? /** * Message queue open to client */ struct GNUNET_MQ_Handle *mq; /** * Channel open to client. */ struct GNUNET_CADET_Channel *to_channel; /** * Channel open from client. */ struct GNUNET_CADET_Channel *from_channel; // unneeded /** * This is pobably followed by 'statistical' data (when we first saw * him, how did we get his ID, how many pushes (in a timeinterval), * ...) */ }; /*********************************************************************** * /Housekeeping with peers ***********************************************************************/ /*********************************************************************** * Globals ***********************************************************************/ /** * Set of all peers to keep track of them. */ static struct GNUNET_CONTAINER_MultiPeerMap *peer_map; /** * The gossiped list of peers. */ static struct GNUNET_PeerIdentity *gossip_list; /** * Size of the gossiped list */ static unsigned int gossip_list_size; /** * The estimated size of the network. * * Influenced by the stdev. */ static unsigned int est_size; //size_t est_size; /** * Percentage of total peer number in the gossip list * to send random PUSHes to * * TODO do not read from configuration */ static float alpha; /** * Percentage of total peer number in the gossip list * to send random PULLs to * * TODO do not read from configuration */ static float beta; /** * The percentage gamma of history updates. * Simply 1 - alpha - beta */ /** * Identifier for the main task that runs periodically. */ static struct GNUNET_SCHEDULER_Task * do_round_task; /** * Time inverval the do_round task runs in. */ static struct GNUNET_TIME_Relative round_interval; /** * List to store peers received through pushes temporary. * * TODO -> multipeermap */ static struct GNUNET_PeerIdentity *push_list; /** * Size of the push_list; */ static unsigned int push_list_size; //size_t push_list_size; /** * List to store peers received through pulls temporary. * * TODO -> multipeermap */ static struct GNUNET_PeerIdentity *pull_list; /** * Size of the pull_list; */ static unsigned int pull_list_size; //size_t pull_list_size; /** * Handler to NSE. */ static struct GNUNET_NSE_Handle *nse; /** * Handler to CADET. */ static struct GNUNET_CADET_Handle *cadet_handle; /** * Global counter */ uint64_t g_i = 0; /** * Request counter. * * Only needed in the beginning to check how many of the 64 deltas * we already have */ static unsigned int req_counter; /** * Time of the last request we received. * * Used to compute the expected request rate. */ static struct GNUNET_TIME_Absolute last_request; /** * Size of #request_deltas. */ #define REQUEST_DELTAS_SIZE 64 static unsigned int request_deltas_size = REQUEST_DELTAS_SIZE; /** * Last 64 deltas between requests */ static struct GNUNET_TIME_Relative request_deltas[REQUEST_DELTAS_SIZE]; /** * The prediction of the rate of requests */ static struct GNUNET_TIME_Relative request_rate; /*********************************************************************** * /Globals ***********************************************************************/ /*********************************************************************** * Util functions ***********************************************************************/ /** * Check if peer is already in peer array. */ int in_arr (const struct GNUNET_PeerIdentity *array, unsigned int arr_size, const struct GNUNET_PeerIdentity *peer) { GNUNET_assert (NULL != peer); if (0 == arr_size) return GNUNET_NO; GNUNET_assert (NULL != array); unsigned int i; i = 0; while (0 != GNUNET_CRYPTO_cmp_peer_identity (&array[i], peer) && i < arr_size) i++; if (i == arr_size) return GNUNET_NO; else return GNUNET_YES; } /** * Get random peer from the gossip list. */ struct GNUNET_PeerIdentity * get_rand_peer(const struct GNUNET_PeerIdentity *peer_list, unsigned int list_size) { uint64_t r_index; struct GNUNET_PeerIdentity *peer; peer = GNUNET_new(struct GNUNET_PeerIdentity); // FIXME if we have only NULL in gossip list this will block // but then we might have a problem nevertheless do { /**; * Choose the r_index of the peer we want to return * at random from the interval of the gossip list */ r_index = GNUNET_CRYPTO_random_u64(GNUNET_CRYPTO_QUALITY_STRONG, list_size); *peer = peer_list[r_index]; } while (NULL == peer); return peer; } /** * Get the context of a peer. If not existing, create. */ struct peer_context * get_peer_ctx (struct GNUNET_CONTAINER_MultiPeerMap *peer_map, const struct GNUNET_PeerIdentity *peer) { struct peer_context *ctx; if ( GNUNET_YES == GNUNET_CONTAINER_multipeermap_contains (peer_map, peer)) { ctx = GNUNET_CONTAINER_multipeermap_get (peer_map, peer); } else { ctx = GNUNET_new (struct peer_context); ctx->in_flags = 0; ctx->mq = NULL; ctx->to_channel = NULL; ctx->from_channel = NULL; (void) GNUNET_CONTAINER_multipeermap_put (peer_map, peer, ctx, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST); } return ctx; } /** * Get the channel of a peer. If not existing, create. */ struct GNUNET_CADET_Channel * get_channel (struct GNUNET_CONTAINER_MultiPeerMap *peer_map, const struct GNUNET_PeerIdentity *peer) { struct peer_context *ctx; ctx = get_peer_ctx (peer_map, peer); if (NULL == ctx->to_channel) { ctx->to_channel = GNUNET_CADET_channel_create (cadet_handle, NULL, peer, GNUNET_RPS_CADET_PORT, GNUNET_CADET_OPTION_RELIABLE); // do I have to explicitly put it in the peer_map? (void) GNUNET_CONTAINER_multipeermap_put (peer_map, peer, ctx, GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE); } return ctx->to_channel; } /** * Get the message queue of a specific peer. * * If we already have a message queue open to this client, * simply return it, otherways create one. */ struct GNUNET_MQ_Handle * get_mq (struct GNUNET_CONTAINER_MultiPeerMap *peer_map, const struct GNUNET_PeerIdentity *peer_id) { struct peer_context *ctx; ctx = get_peer_ctx (peer_map, peer_id); if (NULL == ctx->mq) { (void) get_channel (peer_map, peer_id); ctx->mq = GNUNET_CADET_mq_create (ctx->to_channel); //do I have to explicitly put it in the peer_map? (void) GNUNET_CONTAINER_multipeermap_put (peer_map, peer_id, ctx, GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE); } return ctx->mq; } /** * Sum all time relatives of an array. */ struct GNUNET_TIME_Relative T_relative_sum (const struct GNUNET_TIME_Relative *rel_array, uint64_t arr_size) { struct GNUNET_TIME_Relative sum; uint64_t i; sum = GNUNET_TIME_UNIT_ZERO; for ( i = 0 ; i < arr_size ; i++ ) { sum = GNUNET_TIME_relative_add (sum, rel_array[i]); } return sum; } /** * Compute the average of given time relatives. */ struct GNUNET_TIME_Relative T_relative_avg (const struct GNUNET_TIME_Relative *rel_array, uint64_t arr_size) { return GNUNET_TIME_relative_divide (T_relative_sum (rel_array, arr_size), arr_size); // FIXME find a way to devide that by arr_size } /*********************************************************************** * /Util functions ***********************************************************************/ /** * Function called by NSE. * * Updates sizes of sampler list and gossip list and adapt those lists * accordingly. */ void nse_callback(void *cls, struct GNUNET_TIME_Absolute timestamp, double logestimate, double std_dev) { double estimate; unsigned int old_est; //double scale; // TODO this might go gloabal/config old_est = est_size; LOG (GNUNET_ERROR_TYPE_DEBUG, "Received a ns estimate - logest: %f, std_dev: %f (old_est: %f)\n", logestimate, std_dev, old_est); //scale = .01; estimate = GNUNET_NSE_log_estimate_to_n (logestimate); // GNUNET_NSE_log_estimate_to_n (logestimate); estimate = pow (estimate, 1./3); // TODO add if std_dev is a number // estimate += (std_dev * scale); if ( 0 < estimate ) { LOG (GNUNET_ERROR_TYPE_DEBUG, "Changing estimate to %f\n", estimate); est_size = estimate; } else LOG (GNUNET_ERROR_TYPE_DEBUG, "Not using estimate %f\n", estimate); /* If the NSE has changed adapt the lists accordingly */ // TODO respect the request rate, min, max if (old_est > est_size*4) { /* Shrinking */ RPS_sampler_resize (old_est/2); } else if (old_est < est_size) { /* Growing */ if (est_size < old_est*2) RPS_sampler_resize (old_est*2); else RPS_sampler_resize (est_size); } } /** * Handle RPS request from the client. * * @param cls closure * @param client identification of the client * @param message the actual message */ static void // TODO rename handle_cs_request (void *cls, struct GNUNET_SERVER_Client *client, const struct GNUNET_MessageHeader *message) { LOG(GNUNET_ERROR_TYPE_DEBUG, "Client requested (a) random peer(s).\n"); struct GNUNET_RPS_CS_RequestMessage *msg; //unsigned int n_arr[sampler_list->size];// = //GNUNET_CRYPTO_random_permute(GNUNET_CRYPTO_QUALITY_STRONG, (unsigned int) sampler_list->size); //struct GNUNET_MQ_Handle *mq; struct client_ctx *cli_ctx; struct GNUNET_MQ_Envelope *ev; struct GNUNET_RPS_CS_ReplyMessage *out_msg; uint64_t num_peers; const struct GNUNET_PeerIdentity *peers; //uint64_t i; /* Estimate request rate */ if (request_deltas_size > req_counter) req_counter++; if ( 1 < req_counter) { /* Shift last request deltas to the right */ memcpy (&request_deltas[1], request_deltas, (req_counter - 1) * sizeof (struct GNUNET_TIME_Relative)); /* Add current delta to beginning */ request_deltas[0] = GNUNET_TIME_absolute_get_difference (last_request, GNUNET_TIME_absolute_get ()); request_rate = T_relative_avg (request_deltas, req_counter); } last_request = GNUNET_TIME_absolute_get(); // TODO resize the size of the extended_samplers // TODO check message size msg = (struct GNUNET_RPS_CS_RequestMessage *) message; cli_ctx = GNUNET_SERVER_client_get_user_context (client, struct client_ctx); if ( NULL == cli_ctx ) { cli_ctx = GNUNET_new(struct client_ctx); cli_ctx->mq = GNUNET_MQ_queue_for_server_client (client); GNUNET_SERVER_client_set_user_context (client, cli_ctx); } // How many peers do we give back? // Wait until we have enough random peers? num_peers = GNUNET_ntohll (msg->num_peers); ev = GNUNET_MQ_msg_extra (out_msg, num_peers * sizeof (struct GNUNET_PeerIdentity), GNUNET_MESSAGE_TYPE_RPS_CS_REPLY); out_msg->num_peers = msg->num_peers; // No conversion between network and network order //&out_msg[1] = RPS_sampler_get_n_rand_peers (num_peers); peers = RPS_sampler_get_n_rand_peers (num_peers); memcpy(&out_msg[1], peers, num_peers * sizeof (struct GNUNET_PeerIdentity)); GNUNET_MQ_send (cli_ctx->mq, ev); //GNUNET_MQ_destroy(mq); GNUNET_SERVER_receive_done (client, GNUNET_OK); } /** * Handle a PUSH message from another peer. * * Check the proof of work and store the PeerID * in the temporary list for pushed PeerIDs. * * @param cls Closure * @param channel The channel the PUSH was received over * @param channel_ctx The context associated with this channel * @param msg The message header */ static int handle_peer_push (void *cls, struct GNUNET_CADET_Channel *channel, void **channel_ctx, const struct GNUNET_MessageHeader *msg) { const struct GNUNET_PeerIdentity *peer; // (check the proof of work) // TODO accept empty message if (ntohs(msg->size) != sizeof (struct GNUNET_RPS_P2P_PushMessage)) { GNUNET_break_op (0); // At the moment our own implementation seems to break that. return GNUNET_SYSERR; } peer = (const struct GNUNET_PeerIdentity *) GNUNET_CADET_channel_get_info (channel, GNUNET_CADET_OPTION_PEER); // FIXME wait for cadet to change this function LOG (GNUNET_ERROR_TYPE_DEBUG, "PUSH received (%s)\n", GNUNET_i2s (peer)); /* Add the sending peer to the push_list */ if (GNUNET_NO == in_arr (push_list, pull_list_size, peer)) GNUNET_array_append (push_list, push_list_size, *peer); return GNUNET_OK; } /** * Handle PULL REQUEST request message from another peer. * * Reply with the gossip list of PeerIDs. * * @param cls Closure * @param channel The channel the PUSH was received over * @param channel_ctx The context associated with this channel * @param msg The message header */ static int handle_peer_pull_request (void *cls, struct GNUNET_CADET_Channel *channel, void **channel_ctx, const struct GNUNET_MessageHeader *msg) { struct GNUNET_PeerIdentity *peer; struct GNUNET_MQ_Handle *mq; struct GNUNET_MQ_Envelope *ev; struct GNUNET_RPS_P2P_PullReplyMessage *out_msg; // assert that msg->size is 0 // TODO accept empty message if (ntohs(msg->size) != sizeof (struct GNUNET_RPS_P2P_PullRequestMessage)) { GNUNET_break_op (0); // At the moment our own implementation seems to break that. return GNUNET_SYSERR; } peer = (struct GNUNET_PeerIdentity *) GNUNET_CADET_channel_get_info (channel, GNUNET_CADET_OPTION_PEER); // FIXME wait for cadet to change this function LOG (GNUNET_ERROR_TYPE_DEBUG, "PULL REQUEST from peer %s received\n", GNUNET_i2s (peer)); mq = get_mq (peer_map, peer); ev = GNUNET_MQ_msg_extra (out_msg, gossip_list_size * sizeof (struct GNUNET_PeerIdentity), GNUNET_MESSAGE_TYPE_RPS_PP_PULL_REPLY); out_msg->num_peers = GNUNET_htonll (gossip_list_size); memcpy (&out_msg[1], gossip_list, gossip_list_size * sizeof (struct GNUNET_PeerIdentity)); GNUNET_MQ_send (mq, ev); return GNUNET_OK; } /** * Handle PULL REPLY message from another peer. * * Check whether we sent a corresponding request and * whether this reply is the first one. * * @param cls Closure * @param channel The channel the PUSH was received over * @param channel_ctx The context associated with this channel * @param msg The message header */ static int handle_peer_pull_reply (void *cls, struct GNUNET_CADET_Channel *channel, void **channel_ctx, const struct GNUNET_MessageHeader *msg) { LOG (GNUNET_ERROR_TYPE_DEBUG, "PULL REPLY received\n"); struct GNUNET_RPS_P2P_PullReplyMessage *in_msg; struct GNUNET_PeerIdentity *peers; uint64_t i; if (sizeof (struct GNUNET_RPS_P2P_PullReplyMessage) < ntohs (msg->size)) { GNUNET_break_op (0); // At the moment our own implementation seems to break that. return GNUNET_SYSERR; } in_msg = (struct GNUNET_RPS_P2P_PullReplyMessage *) msg; if (ntohs (msg->size) - sizeof (struct GNUNET_RPS_P2P_PullReplyMessage) / sizeof (struct GNUNET_PeerIdentity) != GNUNET_ntohll (in_msg->num_peers)) { GNUNET_break_op (0); return GNUNET_SYSERR; } // TODO check that we sent a request and that it is the first reply peers = (struct GNUNET_PeerIdentity *) &msg[1]; for ( i = 0 ; i < GNUNET_ntohll (in_msg->num_peers) ; i++ ) { if (GNUNET_NO == in_arr(pull_list, pull_list_size, &peers[i])) GNUNET_array_append (pull_list, pull_list_size, peers[i]); } // TODO check that id is valid - whether it is reachable return GNUNET_OK; } /** * Send out PUSHes and PULLs. * * This is executed regylary. */ static void do_round (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { LOG(GNUNET_ERROR_TYPE_DEBUG, "Going to execute next round\n"); uint64_t i; //unsigned int *n_arr; unsigned int n_peers; /* Number of peers we send pushes/pulls to */ struct GNUNET_RPS_P2P_PushMessage *push_msg; struct GNUNET_RPS_P2P_PullRequestMessage *pull_msg; // FIXME Send empty message struct GNUNET_MQ_Envelope *ev; const struct GNUNET_PeerIdentity *peer; struct GNUNET_MQ_Handle *mq; // TODO print lists, ... // TODO randomise and spread calls herein over time /* Would it make sense to have one shuffeled gossip list and then * to send PUSHes to first alpha peers, PULL requests to next beta peers and * use the rest to update sampler? * in essence get random peers with consumption */ /* Send PUSHes */ //n_arr = GNUNET_CRYPTO_random_permute(GNUNET_CRYPTO_QUALITY_STRONG, (unsigned int) gossip_list_size); n_peers = round (alpha * gossip_list_size); if (0 == n_peers) n_peers = 1; LOG(GNUNET_ERROR_TYPE_DEBUG, "Going to send pushes to %u (%f * %u) peers.\n", n_peers, alpha, gossip_list_size); for ( i = 0 ; i < n_peers ; i++ ) { peer = get_rand_peer (gossip_list, gossip_list_size); if (own_identity != peer) { // FIXME if this fails schedule/loop this for later LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending PUSH to peer %s of gossiped list.\n", GNUNET_i2s (peer)); ev = GNUNET_MQ_msg (push_msg, GNUNET_MESSAGE_TYPE_RPS_PP_PUSH); push_msg = NULL; // FIXME sometimes it returns a pointer to a freed mq mq = get_mq (peer_map, peer); GNUNET_MQ_send (mq, ev); } } /* Send PULL requests */ //n_arr = GNUNET_CRYPTO_random_permute(GNUNET_CRYPTO_QUALITY_STRONG, (unsigned int) sampler_list->size); n_peers = round (beta * gossip_list_size); if (0 == n_peers) n_peers = 1; LOG (GNUNET_ERROR_TYPE_DEBUG, "Going to send pulls to %u (%f * %u) peers.\n", n_peers, beta, gossip_list_size); for ( i = 0 ; i < n_peers ; i++ ) { peer = get_rand_peer (gossip_list, gossip_list_size); if (own_identity != peer) { // FIXME if this fails schedule/loop this for later LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending PULL request to peer %s of gossiped list.\n", GNUNET_i2s (peer)); ev = GNUNET_MQ_msg (pull_msg, GNUNET_MESSAGE_TYPE_RPS_PP_PULL_REQUEST); pull_msg = NULL; mq = get_mq (peer_map, peer); GNUNET_MQ_send (mq, ev); } } /* Update gossip list */ uint64_t r_index; if ( push_list_size <= alpha * gossip_list_size && push_list_size != 0 && pull_list_size != 0 ) { LOG(GNUNET_ERROR_TYPE_DEBUG, "Update of the gossip list. ()\n"); uint64_t first_border; uint64_t second_border; GNUNET_array_grow(gossip_list, gossip_list_size, est_size); first_border = round(alpha * gossip_list_size); for ( i = 0 ; i < first_border ; i++ ) { // TODO use RPS_sampler_get_n_rand_peers /* Update gossip list with peers received through PUSHes */ r_index = GNUNET_CRYPTO_random_u64(GNUNET_CRYPTO_QUALITY_STRONG, push_list_size); gossip_list[i] = push_list[r_index]; // TODO change the in_flags accordingly } second_border = first_border + round(beta * gossip_list_size); for ( i = first_border ; i < second_border ; i++ ) { /* Update gossip list with peers received through PULLs */ r_index = GNUNET_CRYPTO_random_u64(GNUNET_CRYPTO_QUALITY_STRONG, pull_list_size); gossip_list[i] = pull_list[r_index]; // TODO change the in_flags accordingly } for ( i = second_border ; i < gossip_list_size ; i++ ) { /* Update gossip list with peers from history */ peer = RPS_sampler_get_n_rand_peers (1), gossip_list[i] = *peer; // TODO change the in_flags accordingly } } else { LOG(GNUNET_ERROR_TYPE_DEBUG, "No update of the gossip list. ()\n"); } // TODO independent of that also get some peers from CADET_get_peers()? /* Update samplers */ for ( i = 0 ; i < push_list_size ; i++ ) { RPS_sampler_update_list (&push_list[i]); // TODO set in_flag? } for ( i = 0 ; i < pull_list_size ; i++ ) { RPS_sampler_update_list (&pull_list[i]); // TODO set in_flag? } /* Empty push/pull lists */ GNUNET_array_grow (push_list, push_list_size, 0); GNUNET_array_grow (pull_list, pull_list_size, 0); struct GNUNET_TIME_Relative time_next_round; struct GNUNET_TIME_Relative half_round_interval; unsigned int rand_delay; /* Compute random time value between .5 * round_interval and 1.5 *round_interval */ half_round_interval = GNUNET_TIME_relative_divide (round_interval, 2); do { /* * Compute random value between (0 and 1) * round_interval * via multiplying round_interval with a 'fraction' (0 to value)/value */ rand_delay = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, UINT_MAX/10); time_next_round = GNUNET_TIME_relative_multiply (round_interval, rand_delay); time_next_round = GNUNET_TIME_relative_divide (time_next_round, UINT_MAX/10); time_next_round = GNUNET_TIME_relative_add (time_next_round, half_round_interval); } while (GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us == time_next_round.rel_value_us); /* Schedule next round */ do_round_task = GNUNET_SCHEDULER_add_delayed (round_interval, &do_round, NULL); LOG (GNUNET_ERROR_TYPE_DEBUG, "Finished round\n"); } /** * Open a connection to given peer and store channel and mq. */ void insertCB (void *cls, const struct GNUNET_PeerIdentity *id) { // We open a channel to be notified when this peer goes down. (void) get_channel (peer_map, id); } /** * Close the connection to given peer and delete channel and mq. */ void removeCB (void *cls, const struct GNUNET_PeerIdentity *id) { size_t s; struct peer_context *ctx; s = RPS_sampler_count_id (id); if ( 1 >= s ) { if (GNUNET_YES == GNUNET_CONTAINER_multipeermap_contains (peer_map, id)) { ctx = GNUNET_CONTAINER_multipeermap_get (peer_map, id); if (NULL != ctx->to_channel) { if (NULL != ctx->mq) { GNUNET_MQ_destroy (ctx->mq); } // may already be freed at shutdown of cadet //GNUNET_CADET_channel_destroy (ctx->to_channel); } // TODO cleanup peer (void) GNUNET_CONTAINER_multipeermap_remove_all (peer_map, id); } } } static void rps_start (struct GNUNET_SERVER_Handle *server); /** * This is called from GNUNET_CADET_get_peers(). * * It is called on every peer(ID) that cadet somehow has contact with. * We use those to initialise the sampler. */ void init_peer_cb (void *cls, const struct GNUNET_PeerIdentity *peer, int tunnel, // "Do we have a tunnel towards this peer?" unsigned int n_paths, // "Number of known paths towards this peer" unsigned int best_path) // "How long is the best path? // (0 = unknown, 1 = ourselves, 2 = neighbor)" { struct init_peer_cls *ipc; ipc = (struct init_peer_cls *) cls; if ( NULL != peer ) { LOG (GNUNET_ERROR_TYPE_DEBUG, "Got %" PRIX32 ". peer %s (at %p) from CADET (gossip_list_size: %u)\n", ipc->i, GNUNET_i2s (peer), peer, gossip_list_size); RPS_sampler_update_list (peer); (void) get_peer_ctx (peer_map, peer); // unneeded? -> insertCB if (ipc->i < gossip_list_size) { gossip_list[ipc->i] = *peer; // FIXME sometimes we're writing to invalid space here // not sure whether fixed ipc->i++; } // send push/pull to each of those peers? } else { if (ipc->i < gossip_list_size) { memcpy(&gossip_list[ipc->i], RPS_sampler_get_n_rand_peers (1), (gossip_list_size - ipc->i) * sizeof(struct GNUNET_PeerIdentity)); } rps_start (ipc->server); GNUNET_free (ipc); } } /** * Task run during shutdown. * * @param cls unused * @param tc unused */ static void shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { LOG(GNUNET_ERROR_TYPE_DEBUG, "RPS is going down\n"); if ( NULL != do_round_task ) { GNUNET_SCHEDULER_cancel (do_round_task); do_round_task = NULL; } GNUNET_NSE_disconnect (nse); GNUNET_CADET_disconnect (cadet_handle); GNUNET_free (own_identity); RPS_sampler_destroy (); GNUNET_array_grow (request_deltas, request_deltas_size, 0); GNUNET_array_grow (gossip_list, gossip_list_size, 0); GNUNET_array_grow (push_list, push_list_size, 0); GNUNET_array_grow (pull_list, pull_list_size, 0); } /** * A client disconnected. Remove all of its data structure entries. * * @param cls closure, NULL * @param client identification of the client */ static void handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client * client) { } /** * Handle the channel a peer opens to us. * * @param cls The closure * @param channel The channel the peer wants to establish * @param initiator The peer's peer ID * @param port The port the channel is being established over * @param options Further options */ static void * handle_inbound_channel (void *cls, struct GNUNET_CADET_Channel *channel, const struct GNUNET_PeerIdentity *initiator, uint32_t port, enum GNUNET_CADET_ChannelOption options) { struct peer_context *ctx; LOG(GNUNET_ERROR_TYPE_DEBUG, "New channel was established to us (Peer %s).\n", GNUNET_i2s(initiator)); GNUNET_assert( NULL != channel ); // we might not even store the from_channel ctx = get_peer_ctx(peer_map, initiator); if (NULL != ctx->from_channel) { ctx->from_channel = channel; } // FIXME there might already be an established channel //ctx->in_flags = in_other_gossip_list; ctx->mq = NULL; // TODO create mq? (void) GNUNET_CONTAINER_multipeermap_put (peer_map, initiator, ctx, GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE); return NULL; // TODO } /** * This is called when a remote peer destroys a channel. * * @param cls The closure * @param channel The channel being closed * @param channel_ctx The context associated with this channel */ static void cleanup_channel(void *cls, const struct GNUNET_CADET_Channel *channel, void *channel_ctx) { struct GNUNET_PeerIdentity *peer; LOG(GNUNET_ERROR_TYPE_DEBUG, "Channel to remote peer was destroyed.\n"); peer = (struct GNUNET_PeerIdentity *) GNUNET_CADET_channel_get_info ( (struct GNUNET_CADET_Channel *) channel, GNUNET_CADET_OPTION_PEER); // Guess simply casting isn't the nicest way... // FIXME wait for cadet to change this function RPS_sampler_reinitialise_by_value (peer); } /** * Actually start the service. */ static void rps_start (struct GNUNET_SERVER_Handle *server) { static const struct GNUNET_SERVER_MessageHandler handlers[] = { {&handle_cs_request, NULL, GNUNET_MESSAGE_TYPE_RPS_CS_REQUEST, sizeof (struct GNUNET_RPS_CS_RequestMessage)}, {NULL, NULL, 0, 0} }; GNUNET_SERVER_add_handlers (server, handlers); GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL); LOG(GNUNET_ERROR_TYPE_DEBUG, "Ready to receive requests from clients\n"); do_round_task = GNUNET_SCHEDULER_add_now (&do_round, NULL); LOG(GNUNET_ERROR_TYPE_DEBUG, "Scheduled first round\n"); GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task, NULL); } /** * Process statistics requests. * * @param cls closure * @param server the initialized server * @param c configuration to use */ static void run (void *cls, struct GNUNET_SERVER_Handle *server, const struct GNUNET_CONFIGURATION_Handle *c) { // TODO check what this does -- copied from gnunet-boss // - seems to work as expected GNUNET_log_setup ("rps", GNUNET_error_type_to_string (GNUNET_ERROR_TYPE_DEBUG), NULL); LOG(GNUNET_ERROR_TYPE_DEBUG, "RPS started\n"); struct init_peer_cls *ipc; cfg = c; /* Get own ID */ own_identity = GNUNET_new (struct GNUNET_PeerIdentity); GNUNET_CRYPTO_get_peer_identity (cfg, own_identity); // TODO check return value GNUNET_assert (NULL != own_identity); LOG (GNUNET_ERROR_TYPE_DEBUG, "Own identity is %s (at %p).\n", GNUNET_i2s(own_identity), own_identity); /* Get time interval from the configuration */ if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_time (cfg, "RPS", "ROUNDINTERVAL", &round_interval)) { LOG (GNUNET_ERROR_TYPE_DEBUG, "Failed to read ROUNDINTERVAL from config\n"); GNUNET_SCHEDULER_shutdown(); return; } /* Get initial size of sampler/gossip list from the configuration */ if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (cfg, "RPS", "INITSIZE", (long long unsigned int *) &est_size)) { LOG (GNUNET_ERROR_TYPE_DEBUG, "Failed to read INITSIZE from config\n"); GNUNET_SCHEDULER_shutdown (); return; } LOG (GNUNET_ERROR_TYPE_DEBUG, "INITSIZE is %" PRIu64 "\n", est_size); //gossip_list_size = est_size; // TODO rename est_size gossip_list = NULL; GNUNET_array_grow (gossip_list, gossip_list_size, est_size); /* connect to NSE */ nse = GNUNET_NSE_connect(cfg, nse_callback, NULL); // TODO check whether that was successful // TODO disconnect on shutdown LOG(GNUNET_ERROR_TYPE_DEBUG, "Connected to NSE\n"); alpha = 0.45; beta = 0.45; // TODO initialise thresholds - ? /* Get alpha from the configuration */ if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_float (cfg, "RPS", "ALPHA", &alpha)) { LOG(GNUNET_ERROR_TYPE_DEBUG, "No ALPHA specified in the config\n"); } LOG(GNUNET_ERROR_TYPE_DEBUG, "ALPHA is %f\n", alpha); /* Get beta from the configuration */ if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_float (cfg, "RPS", "BETA", &beta)) { LOG (GNUNET_ERROR_TYPE_DEBUG, "No BETA specified in the config\n"); } LOG (GNUNET_ERROR_TYPE_DEBUG, "BETA is %f\n", beta); // TODO check that alpha + beta < 1 peer_map = GNUNET_CONTAINER_multipeermap_create (est_size, GNUNET_NO); /* Initialise cadet */ static const struct GNUNET_CADET_MessageHandler cadet_handlers[] = { {&handle_peer_push , GNUNET_MESSAGE_TYPE_RPS_PP_PUSH , 0}, {&handle_peer_pull_request, GNUNET_MESSAGE_TYPE_RPS_PP_PULL_REQUEST, 0}, {&handle_peer_pull_reply , GNUNET_MESSAGE_TYPE_RPS_PP_PULL_REPLY , 0}, {NULL, 0, 0} }; const uint32_t ports[] = {GNUNET_RPS_CADET_PORT, 0}; // _PORT specified in src/rps/rps.h cadet_handle = GNUNET_CADET_connect (cfg, cls, &handle_inbound_channel, &cleanup_channel, cadet_handlers, ports); LOG (GNUNET_ERROR_TYPE_DEBUG, "Connected to CADET\n"); /* Initialise sampler */ RPS_sampler_init (est_size, own_identity, insertCB, NULL, removeCB, NULL); /* Initialise push and pull maps */ push_list = NULL; push_list_size = 0; pull_list = NULL; pull_list_size = 0; ipc = GNUNET_new (struct init_peer_cls); ipc->server = server; ipc->i = 0; LOG (GNUNET_ERROR_TYPE_DEBUG, "Requesting peers from CADET\n"); GNUNET_CADET_get_peers (cadet_handle, &init_peer_cb, ipc); // TODO send push/pull to each of those peers? } /** * The main function for the rps service. * * @param argc number of arguments from the command line * @param argv command line arguments * @return 0 ok, 1 on error */ int main (int argc, char *const *argv) { return (GNUNET_OK == GNUNET_SERVICE_run (argc, argv, "rps", GNUNET_SERVICE_OPTION_NONE, &run, NULL)) ? 0 : 1; } /* end of gnunet-service-rps.c */