/*
This file is part of GNUnet
- (C) 2012 Christian Grothoff (and other contributing authors)
+ (C) 2012, 2013 Christian Grothoff (and other contributing authors)
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 2, or (at your
+ 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
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 consensus/gnunet-service-consensus.c
+ * @brief multi-peer set reconciliation
+ * @author Florian Dold
+ */
#include "platform.h"
+#include "gnunet_util_lib.h"
#include "gnunet_protocols.h"
-#include "gnunet_common.h"
-#include "gnunet_service_lib.h"
+#include "gnunet_applications.h"
+#include "gnunet_set_service.h"
#include "gnunet_consensus_service.h"
-#include "gnunet_core_service.h"
-#include "gnunet_container_lib.h"
+#include "consensus_protocol.h"
#include "consensus.h"
-struct ConsensusClient;
+/**
+ * Log macro that prefixes the local peer and the peer we are in contact with.
+ */
+#define LOG_PP(kind, cpi, m,...) GNUNET_log (kind, "P%d for P%d: " m, \
+ cpi->session->local_peer_idx, (int) (cpi - cpi->session->info),##__VA_ARGS__)
+
+
+/**
+ * Number of exponential rounds, used in the exp and completion round.
+ */
+#define NUM_EXP_ROUNDS 4
+
+/* forward declarations */
+
+/* mutual recursion with struct ConsensusSession */
+struct ConsensusPeerInformation;
+/* mutual recursion with round_over */
static void
-send_next (struct ConsensusClient *cli);
+subround_over (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
/**
- * An element that is waiting to be transmitted to a client.
+ * Describes the current round a consensus session is in.
*/
-struct PendingElement
+enum ConsensusRound
{
/**
- * Pending elements are kept in a DLL.
+ * Not started the protocol yet.
*/
- struct PendingElement *next;
-
+ CONSENSUS_ROUND_BEGIN=0,
/**
- * Pending elements are kept in a DLL.
+ * Distribution of elements with the exponential scheme.
*/
- struct PendingElement *prev;
+ CONSENSUS_ROUND_EXCHANGE,
+ /**
+ * Exchange which elements each peer has, but don't
+ * transmit the element's data, only their SHA-512 hashes.
+ * This round uses the all-to-all scheme.
+ */
+ CONSENSUS_ROUND_INVENTORY,
+ /**
+ * Collect and distribute missing values with the exponential scheme.
+ */
+ CONSENSUS_ROUND_COMPLETION,
+ /**
+ * Consensus concluded. After timeout and finished communication with client,
+ * consensus session will be destroyed.
+ */
+ CONSENSUS_ROUND_FINISH
+};
+
+/**
+ * Complete information about the current round and all
+ * subrounds.
+ */
+struct RoundInfo
+{
/**
- * The actual element
+ * The current main round.
*/
- struct GNUNET_CONSENSUS_Element *element;
+ enum ConsensusRound round;
+ /**
+ * The current exp round, valid if
+ * the main round is an exp round.
+ */
+ uint32_t exp_round;
+ /**
+ * The current exp subround, valid if
+ * the main round is an exp round.
+ */
+ uint32_t exp_subround;
};
/**
- * A consensus session consists of one or more local clients,
- * as well as zero or more remote authorities.
+ * A consensus session consists of one local client and the remote authorities.
*/
struct ConsensusSession
{
struct ConsensusSession *prev;
/**
- * Consensus clients are kept in a DLL.
+ * Global consensus identification, computed
+ * from the session id and participating authorities.
+ */
+ struct GNUNET_HashCode global_id;
+
+ /**
+ * Client that inhabits the session
*/
- struct ConsensusClient *clients_head;
+ struct GNUNET_SERVER_Client *client;
/**
- * Consensus clients are kept in a DLL.
+ * Queued messages to the client.
*/
- struct ConsensusClient *clients_tail;
+ struct GNUNET_MQ_Handle *client_mq;
/**
- * Local consensus identification, chosen by clients.
- */
- struct GNUNET_HashCode *local_id;
-
+ * Timeout for all rounds together, single rounds will schedule a timeout task
+ * with a fraction of the conclude timeout.
+ * Only valid once the current round is not CONSENSUS_ROUND_BEGIN.
+ */
+ struct GNUNET_TIME_Relative conclude_timeout;
+
/**
- * Global consensus identification, computed
- * from the local id and participating authorities.
- */
- struct GNUNET_HashCode *global_id;
+ * Timeout task identifier for the current round.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier round_timeout_tid;
/**
- * Values in the consensus set of this session.
+ * Number of other peers in the consensus.
*/
- struct GNUNET_CONTAINER_MultiHashMap *values;
-};
+ unsigned int num_peers;
+ /**
+ * Information about the other peers,
+ * their state, etc.
+ */
+ struct ConsensusPeerInformation *info;
-struct ConsensusClient
-{
/**
- * Consensus clients are kept in a DLL.
+ * Index of the local peer in the peers array
*/
- struct ConsensusClient *next;
+ unsigned int local_peer_idx;
+
/**
- * Consensus clients are kept in a DLL.
+ * Current round
*/
- struct ConsensusClient *prev;
+ enum ConsensusRound current_round;
/**
- * Corresponding server handle.
+ * Permutation of peers for the current round,
*/
- struct GNUNET_SERVER_Client *client;
+ uint32_t *shuffle;
/**
- * Client wants to receive and send updates.
+ * Inverse permutation of peers for the current round,
*/
- int begin;
+ uint32_t *shuffle_inv;
/**
- * Session this client belongs to
+ * Current round of the exponential scheme.
*/
- struct ConsensusSession *session;
+ uint32_t exp_round;
/**
- * Values in the consensus set of this client.
- * Includes pending elements.
+ * Current sub-round of the exponential scheme.
*/
- struct GNUNET_CONTAINER_MultiHashMap *values;
+ uint32_t exp_subround;
/**
- * Elements that have not been set to the client yet.
+ * The partner for the current exp-round
*/
- struct PendingElement *pending_head;
+ struct ConsensusPeerInformation *partner_outgoing;
+
+ /**
+ * The partner for the current exp-round
+ */
+ struct ConsensusPeerInformation *partner_incoming;
+
/**
- * Elements that have not been set to the client yet.
+ * The consensus set of this session.
*/
- struct PendingElement *pending_tail;
+ struct GNUNET_SET_Handle *element_set;
/**
- * Currently active transmit handle for sending to the client
+ * Listener for requests from other peers.
+ * Uses the session's global id as app id.
*/
- struct GNUNET_SERVER_TransmitHandle *th;
+ struct GNUNET_SET_ListenHandle *set_listener;
+};
+
+/**
+ * Information about a peer that is in a consensus session.
+ */
+struct ConsensusPeerInformation
+{
/**
- * Once conclude_requested is GNUNET_YES, the client may not
- * insert any more values.
+ * Peer identitty of the peer in the consensus session
*/
- int conclude_requested;
+ struct GNUNET_PeerIdentity peer_id;
/**
- * Client has been informed about the conclusion.
+ * Back-reference to the consensus session,
+ * to that ConsensusPeerInformation can be used as a closure
*/
- int conclude_sent;
+ struct ConsensusSession *session;
+
+ /**
+ * We have finishes the exp-subround with the peer.
+ */
+ int exp_subround_finished;
+
+ /**
+ * Set operation we are currently executing with this peer.
+ */
+ struct GNUNET_SET_OperationHandle *set_op;
+
+ /**
+ * Set operation we are planning on executing with this peer.
+ */
+ struct GNUNET_SET_OperationHandle *delayed_set_op;
+
+ /**
+ * Info about the round of the delayed set operation.
+ */
+ struct RoundInfo delayed_round_info;
};
/**
- * Linked list of sesstions this peer participates in.
+ * Linked list of sessions this peer participates in.
*/
static struct ConsensusSession *sessions_head;
/**
- * Linked list of sesstions this peer participates in.
+ * Linked list of sessions this peer participates in.
*/
static struct ConsensusSession *sessions_tail;
static struct GNUNET_SERVER_Handle *srv;
/**
- * Peer that runs this service
+ * Peer that runs this service.
*/
-static struct GNUNET_PeerIdentity *my_peer;
+static struct GNUNET_PeerIdentity my_peer;
-struct ConsensusClient *
-find_client (const struct GNUNET_SERVER_Client *srv_client)
+static int
+have_exp_subround_finished (const struct ConsensusSession *session)
{
- struct ConsensusSession *session;
- struct ConsensusClient *client;
+ int not_finished;
+ not_finished = 0;
+ if ( (NULL != session->partner_outgoing) &&
+ (GNUNET_NO == session->partner_outgoing->exp_subround_finished) )
+ not_finished++;
+ if ( (NULL != session->partner_incoming) &&
+ (GNUNET_NO == session->partner_incoming->exp_subround_finished) )
+ not_finished++;
+ if (0 == not_finished)
+ return GNUNET_YES;
+ return GNUNET_NO;
+}
- session = sessions_head;
- while (NULL != session)
+
+/**
+ * Destroy a session, free all resources associated with it.
+ *
+ * @param session the session to destroy
+ */
+static void
+destroy_session (struct ConsensusSession *session)
+{
+ int i;
+
+ GNUNET_CONTAINER_DLL_remove (sessions_head, sessions_tail, session);
+ if (NULL != session->element_set)
+ {
+ GNUNET_SET_destroy (session->element_set);
+ session->element_set = NULL;
+ }
+ if (NULL != session->set_listener)
{
- client = session->clients_head;
- while (NULL != client)
+ GNUNET_SET_listen_cancel (session->set_listener);
+ session->set_listener = NULL;
+ }
+ if (NULL != session->client_mq)
+ {
+ GNUNET_MQ_destroy (session->client_mq);
+ session->client_mq = NULL;
+ }
+ if (NULL != session->client)
+ {
+ GNUNET_SERVER_client_disconnect (session->client);
+ session->client = NULL;
+ }
+ if (NULL != session->shuffle)
+ {
+ GNUNET_free (session->shuffle);
+ session->shuffle = NULL;
+ }
+ if (NULL != session->shuffle_inv)
+ {
+ GNUNET_free (session->shuffle_inv);
+ session->shuffle_inv = NULL;
+ }
+ if (NULL != session->info)
+ {
+ for (i = 0; i < session->num_peers; i++)
{
- if (client->client == srv_client)
+ struct ConsensusPeerInformation *cpi;
+ cpi = &session->info[i];
+ if (NULL != cpi->set_op)
{
- return client;
+ GNUNET_SET_operation_cancel (cpi->set_op);
+ cpi->set_op = NULL;
}
- client = client->next;
}
- session = session->next;
+ GNUNET_free (session->info);
+ session->info = NULL;
}
- return NULL;
+ GNUNET_free (session);
}
-static void
-disconnect_client (struct GNUNET_SERVER_Client *client)
-{
- /* FIXME */
-}
-static void
-compute_global_id (struct GNUNET_HashCode *dst,
- const struct GNUNET_HashCode *local_id,
- const struct GNUNET_PeerIdentity *peers,
- int num_peers)
+/**
+ * Iterator for set elements.
+ *
+ * @param cls closure
+ * @param element the current element, NULL if all elements have been
+ * iterated over
+ * @return GNUNET_YES to continue iterating, GNUNET_NO to stop.
+ */
+static int
+send_to_client_iter (void *cls,
+ const struct GNUNET_SET_Element *element)
{
- *dst = *local_id;
+ struct ConsensusSession *session = cls;
+ struct GNUNET_MQ_Envelope *ev;
- /* FIXME: hash other peers into global id */
-}
+ if (NULL != element)
+ {
+ struct GNUNET_CONSENSUS_ElementMessage *m;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "P%d: got element for client\n",
+ session->local_peer_idx);
+
+ ev = GNUNET_MQ_msg_extra (m, element->size, GNUNET_MESSAGE_TYPE_CONSENSUS_CLIENT_RECEIVED_ELEMENT);
+ m->element_type = htons (element->type);
+ memcpy (&m[1], element->data, element->size);
+ GNUNET_MQ_send (session->client_mq, ev);
+ }
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "P%d: finished iterating elements for client\n",
+ session->local_peer_idx);
+ ev = GNUNET_MQ_msg_header (GNUNET_MESSAGE_TYPE_CONSENSUS_CLIENT_CONCLUDE_DONE);
+ GNUNET_MQ_send (session->client_mq, ev);
+ }
+ return GNUNET_YES;
+}
/**
- * Iterator over hash map entries.
+ * Start the next round.
+ * This function can be invoked as a timeout task, or called manually (tc will be NULL then).
*
- * @param cls closure, the client
- * @param key current key code
- * @param value value in the hash map
- * @return GNUNET_YES if we should continue to
- * iterate,
- * GNUNET_NO if not.
+ * @param cls the session
+ * @param tc task context, for when this task is invoked by the scheduler,
+ * NULL if invoked for another reason
*/
-int
-update_pending (void *cls,
- const struct GNUNET_HashCode *key,
- void *value)
+static void
+round_over (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
- struct ConsensusClient *cli;
- struct GNUNET_CONSENSUS_Element *element;
- struct PendingElement *pending_element;
+ struct ConsensusSession *session;
- cli = (struct ConsensusClient *) cls;
- element = (struct GNUNET_CONSENSUS_Element *) value;
- pending_element = GNUNET_malloc (sizeof (struct PendingElement));
- pending_element->element = element;
+ /* don't kick off next round if we're shutting down */
+ if ((NULL != tc) && (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ return;
- if (GNUNET_NO == GNUNET_CONTAINER_multihashmap_contains (cli->values, key))
+ session = cls;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "P%d: round over\n", session->local_peer_idx);
+
+ if (session->round_timeout_tid != GNUNET_SCHEDULER_NO_TASK)
{
- GNUNET_CONTAINER_DLL_insert_tail (cli->pending_head, cli->pending_tail, pending_element);
- GNUNET_CONTAINER_multihashmap_put (cli->values, key, element, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
+ GNUNET_SCHEDULER_cancel (session->round_timeout_tid);
+ session->round_timeout_tid = GNUNET_SCHEDULER_NO_TASK;
}
-
- return GNUNET_YES;
-}
-
+ switch (session->current_round)
+ {
+ case CONSENSUS_ROUND_BEGIN:
+ session->current_round = CONSENSUS_ROUND_EXCHANGE;
+ session->exp_round = 0;
+ subround_over (session, NULL);
+ break;
+ case CONSENSUS_ROUND_EXCHANGE:
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "P%d: finished, sending elements to client\n",
+ session->local_peer_idx);
+ session->current_round = CONSENSUS_ROUND_FINISH;
+ GNUNET_SET_iterate (session->element_set, send_to_client_iter, session);
+ break;
+ default:
+ GNUNET_assert (0);
+ }
+}
-static size_t
-transmit_pending (void *cls, size_t size, void *buf)
+/**
+ * Create a new permutation for the session's peers in session->shuffle.
+ * Uses a Fisher-Yates shuffle with pseudo-randomness coming from
+ * both the global session id and the current round index.
+ *
+ * @param session the session to create the new permutation for
+ */
+static void
+shuffle (struct ConsensusSession *session)
{
- struct GNUNET_CONSENSUS_Element *element;
- struct GNUNET_CONSENSUS_ElementMessage *msg;
- struct ConsensusClient *cli;
-
- cli = (struct ConsensusClient *) cls;
- msg = (struct GNUNET_CONSENSUS_ElementMessage *) buf;
- element = cli->pending_head->element;
+ uint32_t i;
+ uint32_t randomness[session->num_peers-1];
- GNUNET_assert (NULL != element);
+ if (NULL == session->shuffle)
+ session->shuffle = GNUNET_malloc (session->num_peers * sizeof (*session->shuffle));
+ if (NULL == session->shuffle_inv)
+ session->shuffle_inv = GNUNET_malloc (session->num_peers * sizeof (*session->shuffle_inv));
- cli->th = NULL;
+ GNUNET_CRYPTO_kdf (randomness, sizeof (randomness),
+ &session->exp_round, sizeof (uint32_t),
+ &session->global_id, sizeof (struct GNUNET_HashCode),
+ NULL);
- msg->element_type = element->type;
- msg->header.type = htons (GNUNET_MESSAGE_TYPE_CONSENSUS_CLIENT_RECEIVED_ELEMENT);
- msg->header.size = htons (sizeof (struct GNUNET_CONSENSUS_ElementMessage) + element->size);
- memcpy (&msg[1], element->data, element->size);
+ for (i = 0; i < session->num_peers; i++)
+ session->shuffle[i] = i;
+ for (i = session->num_peers - 1; i > 0; i--)
+ {
+ uint32_t x;
+ uint32_t tmp;
+ x = randomness[i-1] % session->num_peers;
+ tmp = session->shuffle[x];
+ session->shuffle[x] = session->shuffle[i];
+ session->shuffle[i] = tmp;
+ }
- cli->pending_head = cli->pending_head->next;
+ /* create the inverse */
+ for (i = 0; i < session->num_peers; i++)
+ session->shuffle_inv[session->shuffle[i]] = i;
+}
- send_next (cli);
- return sizeof (struct GNUNET_CONSENSUS_ElementMessage) + element->size;
+/**
+ * Find and set the partner_incoming and partner_outgoing of our peer,
+ * one of them may not exist (and thus set to NULL) if the number of peers
+ * in the session is not a power of two.
+ *
+ * @param session the consensus session
+ */
+static void
+find_partners (struct ConsensusSession *session)
+{
+ unsigned int arc;
+ unsigned int num_ghosts;
+ unsigned int largest_arc;
+ int partner_idx;
+
+ /* shuffled local index */
+ int my_idx = session->shuffle[session->local_peer_idx];
+
+ /* distance to neighboring peer in current subround */
+ arc = 1 << session->exp_subround;
+ largest_arc = 1;
+ while (largest_arc < session->num_peers)
+ largest_arc <<= 1;
+ num_ghosts = largest_arc - session->num_peers;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "largest arc: %u\n", largest_arc);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "arc: %u\n", arc);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "num ghosts: %u\n", num_ghosts);
+
+ if (0 == (my_idx & arc))
+ {
+ /* we are outgoing */
+ partner_idx = (my_idx + arc) % session->num_peers;
+ session->partner_outgoing = &session->info[session->shuffle_inv[partner_idx]];
+ session->partner_outgoing->exp_subround_finished = GNUNET_NO;
+ /* are we a 'ghost' of a peer that would exist if
+ * the number of peers was a power of two, and thus have to partner
+ * with an additional peer?
+ */
+ if (my_idx < num_ghosts)
+ {
+ int ghost_partner_idx;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "my index %d, arc %d, peers %u\n", my_idx, arc, session->num_peers);
+ ghost_partner_idx = (my_idx - (int) arc) % (int) session->num_peers;
+ /* platform dependent; modulo sometimes returns negative values */
+ if (ghost_partner_idx < 0)
+ ghost_partner_idx += session->num_peers;
+ /* we only need to have a ghost partner if the partner is outgoing */
+ if (0 == (ghost_partner_idx & arc))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "ghost partner is %d\n", ghost_partner_idx);
+ session->partner_incoming = &session->info[session->shuffle_inv[ghost_partner_idx]];
+ session->partner_incoming->exp_subround_finished = GNUNET_NO;
+ return;
+ }
+ }
+ session->partner_incoming = NULL;
+ return;
+ }
+ /* we only have an incoming connection */
+ partner_idx = (my_idx - (int) arc) % (int) session->num_peers;
+ if (partner_idx < 0)
+ partner_idx += session->num_peers;
+ session->partner_outgoing = NULL;
+ session->partner_incoming = &session->info[session->shuffle_inv[partner_idx]];
+ session->partner_incoming->exp_subround_finished = GNUNET_NO;
}
-static size_t
-transmit_conclude_done (void *cls, size_t size, void *buf)
+/**
+ * Callback for set operation results. Called for each element
+ * in the result set.
+ *
+ * @param cls closure
+ * @param element a result element, only valid if status is GNUNET_SET_STATUS_OK
+ * @param status see enum GNUNET_SET_Status
+ */
+static void
+set_result_cb (void *cls,
+ const struct GNUNET_SET_Element *element,
+ enum GNUNET_SET_Status status)
{
- struct GNUNET_CONSENSUS_ConcludeDoneMessage *msg;
+ struct ConsensusPeerInformation *cpi = cls;
+ unsigned int remote_idx = cpi - cpi->session->info;
+ unsigned int local_idx = cpi->session->local_peer_idx;
+
+ GNUNET_assert ((cpi == cpi->session->partner_outgoing) ||
+ (cpi == cpi->session->partner_incoming));
+
+ switch (status)
+ {
+ case GNUNET_SET_STATUS_OK:
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "P%u: set result from P%u: element\n",
+ local_idx, remote_idx);
+ break;
+ case GNUNET_SET_STATUS_FAILURE:
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "P%u: set result from P%u: failure\n",
+ local_idx, remote_idx);
+ cpi->set_op = NULL;
+ return;
+ case GNUNET_SET_STATUS_HALF_DONE:
+ case GNUNET_SET_STATUS_DONE:
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "P%u: set result from P%u: done\n",
+ local_idx, remote_idx);
+ cpi->exp_subround_finished = GNUNET_YES;
+ cpi->set_op = NULL;
+ if (have_exp_subround_finished (cpi->session) == GNUNET_YES)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "P%u: all reconciliations of subround done\n",
+ local_idx);
+ subround_over (cpi->session, NULL);
+ }
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "P%u: waiting for further set results\n",
+ local_idx);
+ }
+ return;
+ default:
+ GNUNET_break (0);
+ return;
+ }
+
+ switch (cpi->session->current_round)
+ {
+ case CONSENSUS_ROUND_EXCHANGE:
+ GNUNET_SET_add_element (cpi->session->element_set, element, NULL, NULL);
+ break;
+ default:
+ GNUNET_break (0);
+ return;
+ }
+}
- msg = (struct GNUNET_CONSENSUS_ConcludeDoneMessage *) buf;
- msg->header.type = htons (GNUNET_MESSAGE_TYPE_CONSENSUS_CLIENT_CONCLUDE);
- msg->header.size = htons (sizeof (struct GNUNET_CONSENSUS_ConcludeDoneMessage));
- msg->num_peers = htons (0);
- return sizeof (struct GNUNET_CONSENSUS_ConcludeDoneMessage);
+/**
+ * Compare the round the session is in with the round of the given context message.
+ *
+ * @param session a consensus session
+ * @param ri a round context message
+ * @return 0 if it's the same round, -1 if the session is in an earlier round,
+ * 1 if the session is in a later round
+ */
+static int
+rounds_compare (struct ConsensusSession *session,
+ struct RoundInfo* ri)
+{
+ if (session->current_round < ri->round)
+ return -1;
+ if (session->current_round > ri->round)
+ return 1;
+ if (session->current_round == CONSENSUS_ROUND_EXCHANGE)
+ {
+ if (session->exp_round < ri->exp_round)
+ return -1;
+ if (session->exp_round > ri->exp_round)
+ return 1;
+ if (session->exp_subround < ri->exp_subround)
+ return -1;
+ if (session->exp_subround < ri->exp_subround)
+ return 1;
+ return 0;
+ }
+ /* comparing rounds when we are not in a exp round */
+ GNUNET_assert (0);
}
/**
- * Schedule sending the next message (if there is any) to a client.
+ * Do the next subround in the exp-scheme.
+ * This function can be invoked as a timeout task, or called manually (tc will be NULL then).
*
- * @param cli the client to send the next message to
+ * @param cls the session
+ * @param tc task context, for when this task is invoked by the scheduler,
+ * NULL if invoked for another reason
*/
static void
-send_next (struct ConsensusClient *cli)
+subround_over (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
- int msize;
+ struct ConsensusSession *session;
+ int i;
- GNUNET_assert (NULL != cli);
+ /* don't kick off next subround if we're shutting down */
+ if ((NULL != tc) && (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ return;
+ session = cls;
+ /* cancel timeout */
+ if (session->round_timeout_tid != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel (session->round_timeout_tid);
+ session->round_timeout_tid = GNUNET_SCHEDULER_NO_TASK;
+ }
- if (NULL != cli->th)
+ if (session->exp_round >= NUM_EXP_ROUNDS)
{
+ round_over (session, NULL);
return;
}
- if ((cli->conclude_requested == GNUNET_YES) && (cli->conclude_sent == GNUNET_NO))
+ if (session->exp_round == 0)
{
- /* just the conclude message with no other authorities in the dummy */
- msize = sizeof (struct GNUNET_CONSENSUS_ConcludeMessage);
- cli->th =
- GNUNET_SERVER_notify_transmit_ready (cli->client, msize,
- GNUNET_TIME_UNIT_FOREVER_REL, &transmit_conclude_done, cli);
- cli->conclude_sent = GNUNET_YES;
+ /* initialize everything for the log-rounds */
+ session->exp_round = 1;
+ session->exp_subround = 0;
+ if (NULL == session->shuffle)
+ session->shuffle = GNUNET_malloc ((sizeof (int)) * session->num_peers);
+ if (NULL == session->shuffle_inv)
+ session->shuffle_inv = GNUNET_malloc ((sizeof (int)) * session->num_peers);
+ for (i = 0; i < session->num_peers; i++)
+ session->shuffle[i] = session->shuffle_inv[i] = i;
}
- else if (NULL != cli->pending_head)
+ else if (session->exp_subround + 1 >= (int) ceil (log2 (session->num_peers)))
{
- msize = cli->pending_head->element->size + sizeof (struct GNUNET_CONSENSUS_ElementMessage);
- cli->th =
- GNUNET_SERVER_notify_transmit_ready (cli->client, msize,
- GNUNET_TIME_UNIT_FOREVER_REL, &transmit_pending, cli);
+ /* subrounds done, start new log-round */
+ session->exp_round++;
+ session->exp_subround = 0;
+ shuffle (session);
}
+ else
+ {
+ session->exp_subround++;
+ }
+
+ /* determine the incoming and outgoing partner */
+ find_partners (session);
+
+ GNUNET_assert (session->partner_outgoing != &session->info[session->local_peer_idx]);
+ GNUNET_assert (session->partner_incoming != &session->info[session->local_peer_idx]);
+
+ /* initiate set operation with the outgoing partner */
+ if (NULL != session->partner_outgoing)
+ {
+ struct GNUNET_CONSENSUS_RoundContextMessage *msg;
+ msg = GNUNET_new (struct GNUNET_CONSENSUS_RoundContextMessage);
+ msg->header.type = htons (GNUNET_MESSAGE_TYPE_CONSENSUS_P2P_ROUND_CONTEXT);
+ msg->header.size = htons (sizeof *msg);
+ msg->round = htonl (session->current_round);
+ msg->exp_round = htonl (session->exp_round);
+ msg->exp_subround = htonl (session->exp_subround);
+
+ if (NULL != session->partner_outgoing->set_op)
+ {
+ GNUNET_SET_operation_cancel (session->partner_outgoing->set_op);
+ }
+ session->partner_outgoing->set_op =
+ GNUNET_SET_prepare (&session->partner_outgoing->peer_id,
+ &session->global_id,
+ (struct GNUNET_MessageHeader *) msg,
+ 0, /* FIXME: salt */
+ GNUNET_SET_RESULT_ADDED,
+ set_result_cb, session->partner_outgoing);
+ GNUNET_free (msg);
+ GNUNET_SET_commit (session->partner_outgoing->set_op, session->element_set);
+ }
+
+ /* commit to the delayed set operation */
+ if ((NULL != session->partner_incoming) && (NULL != session->partner_incoming->delayed_set_op))
+ {
+ int cmp = rounds_compare (session, &session->partner_incoming->delayed_round_info);
+
+ if (NULL != session->partner_incoming->set_op)
+ {
+ GNUNET_SET_operation_cancel (session->partner_incoming->set_op);
+ session->partner_incoming->set_op = NULL;
+ }
+ if (cmp == 0)
+ {
+ GNUNET_SET_commit (session->partner_incoming->delayed_set_op, session->element_set);
+ session->partner_incoming->set_op = session->partner_incoming->delayed_set_op;
+ session->partner_incoming->delayed_set_op = NULL;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "P%d resumed delayed round with P%d\n",
+ session->local_peer_idx, (int) (session->partner_incoming - session->info));
+ }
+ else
+ {
+ /* this should not happen -- a round has been skipped! */
+ GNUNET_break_op (0);
+ }
+ }
+
+#ifdef GNUNET_EXTRA_LOGGING
+ {
+ int in;
+ int out;
+ if (session->partner_outgoing == NULL)
+ out = -1;
+ else
+ out = (int) (session->partner_outgoing - session->info);
+ if (session->partner_incoming == NULL)
+ in = -1;
+ else
+ in = (int) (session->partner_incoming - session->info);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "P%u: doing exp-round, r=%d, sub=%d, in: %d, out: %d\n", session->local_peer_idx,
+ session->exp_round, session->exp_subround, in, out);
+ }
+#endif /* GNUNET_EXTRA_LOGGING */
+
}
/**
- * Called when a client wants to join a consensus session.
+ * Search peer in the list of peers in session.
+ *
+ * @param peer peer to find
+ * @param session session with peer
+ * @return index of peer, -1 if peer is not in session
*/
-static void
-client_join (void *cls,
- struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *m)
+static int
+get_peer_idx (const struct GNUNET_PeerIdentity *peer, const struct ConsensusSession *session)
{
- struct GNUNET_HashCode global_id;
- const struct GNUNET_CONSENSUS_JoinMessage *msg;
- struct ConsensusSession *session;
- struct ConsensusClient *consensus_client;
+ int i;
+ for (i = 0; i < session->num_peers; i++)
+ if (0 == memcmp (peer, &session->info[i].peer_id, sizeof *peer))
+ return i;
+ return -1;
+}
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "join\n");
- fprintf(stderr, "foobar\n");
+/**
+ * Compute a global, (hopefully) unique consensus session id,
+ * from the local id of the consensus session, and the identities of all participants.
+ * Thus, if the local id of two consensus sessions coincide, but are not comprised of
+ * exactly the same peers, the global id will be different.
+ *
+ * @param session session to generate the global id for
+ * @param session_id local id of the consensus session
+ */
+static void
+compute_global_id (struct ConsensusSession *session,
+ const struct GNUNET_HashCode *session_id)
+{
+ int i;
+ struct GNUNET_HashCode tmp;
+ struct GNUNET_HashCode phash;
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "client joined\n");
+ /* FIXME: use kdf? */
- msg = (struct GNUNET_CONSENSUS_JoinMessage *) m;
-
- /* kill the client if it already is in a session */
- if (NULL != find_client (client))
+ session->global_id = *session_id;
+ for (i = 0; i < session->num_peers; ++i)
{
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "client tried to join twice\n");
- disconnect_client (client);
- return;
+ GNUNET_CRYPTO_hash (&session->info[i].peer_id, sizeof (struct GNUNET_PeerIdentity), &phash);
+ GNUNET_CRYPTO_hash_xor (&session->global_id, &phash, &tmp);
+ session->global_id = tmp;
+ GNUNET_CRYPTO_hash (&session->global_id, sizeof (struct GNUNET_PeerIdentity), &tmp);
+ session->global_id = tmp;
}
+}
- consensus_client = GNUNET_malloc (sizeof (struct ConsensusClient));
- consensus_client->client = client;
- consensus_client->begin = GNUNET_NO;
- consensus_client->values = GNUNET_CONTAINER_multihashmap_create (4, GNUNET_NO);
- GNUNET_SERVER_client_keep (client);
+/**
+ * Although GNUNET_CRYPTO_hash_cmp exisits, it does not have
+ * the correct signature to be used with e.g. qsort.
+ * We use this function instead.
+ *
+ * @param h1 some hash code
+ * @param h2 some hash code
+ * @return 1 if h1 > h2, -1 if h1 < h2 and 0 if h1 == h2.
+ */
+static int
+hash_cmp (const void *h1, const void *h2)
+{
+ return GNUNET_CRYPTO_hash_cmp ((struct GNUNET_HashCode *) h1, (struct GNUNET_HashCode *) h2);
+}
- GNUNET_assert (NULL != consensus_client->values);
- compute_global_id (&global_id, &msg->session_id, (struct GNUNET_PeerIdentity *) &m[1], msg->num_peers);
+/**
+ * Create the sorted list of peers for the session,
+ * add the local peer if not in the join message.
+ */
+static void
+initialize_session_peer_list (struct ConsensusSession *session,
+ struct GNUNET_CONSENSUS_JoinMessage *join_msg)
+{
+ unsigned int local_peer_in_list;
+ uint32_t listed_peers;
+ const struct GNUNET_PeerIdentity *msg_peers;
+ struct GNUNET_PeerIdentity *peers;
+ unsigned int i;
- /* look if we already have a session for this local id */
- session = sessions_head;
- while (NULL != session)
+ GNUNET_assert (NULL != join_msg);
+
+ /* peers in the join message, may or may not include the local peer */
+ listed_peers = ntohl (join_msg->num_peers);
+
+ session->num_peers = listed_peers;
+
+ msg_peers = (struct GNUNET_PeerIdentity *) &join_msg[1];
+
+ local_peer_in_list = GNUNET_NO;
+ for (i = 0; i < listed_peers; i++)
{
- if (0 == memcmp(&global_id, session->global_id, sizeof (struct GNUNET_HashCode)))
+ if (0 == memcmp (&msg_peers[i], &my_peer, sizeof (struct GNUNET_PeerIdentity)))
{
- GNUNET_CONTAINER_DLL_insert (session->clients_head, session->clients_tail, consensus_client);
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
- return;
+ local_peer_in_list = GNUNET_YES;
+ break;
}
- session = session->next;
}
- /* session does not exist yet, create it */
- session = GNUNET_malloc (sizeof (struct ConsensusSession));
- session->local_id = GNUNET_memdup (&msg->session_id, sizeof (struct GNUNET_HashCode));
- session->global_id = GNUNET_memdup (&global_id, sizeof (struct GNUNET_HashCode));
- session->values = GNUNET_CONTAINER_multihashmap_create (4, GNUNET_NO);
+ if (GNUNET_NO == local_peer_in_list)
+ session->num_peers++;
- GNUNET_CONTAINER_DLL_insert (sessions_head, sessions_tail, session);
- GNUNET_CONTAINER_DLL_insert (session->clients_head, session->clients_tail, consensus_client);
+ peers = GNUNET_malloc (session->num_peers * sizeof (struct GNUNET_PeerIdentity));
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "created new session");
+ if (GNUNET_NO == local_peer_in_list)
+ peers[session->num_peers - 1] = my_peer;
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
+ memcpy (peers, msg_peers, listed_peers * sizeof (struct GNUNET_PeerIdentity));
+ qsort (peers, session->num_peers, sizeof (struct GNUNET_PeerIdentity), &hash_cmp);
+
+ session->info = GNUNET_malloc (session->num_peers * sizeof (struct ConsensusPeerInformation));
+
+ for (i = 0; i < session->num_peers; ++i)
+ {
+ /* initialize back-references, so consensus peer information can
+ * be used as closure */
+ session->info[i].session = session;
+ session->info[i].peer_id = peers[i];
+ }
+
+ GNUNET_free (peers);
}
/**
- * Called when a client performs an insert operation.
+ * Called when another peer wants to do a set operation with the
+ * local peer.
+ *
+ * @param cls closure
+ * @param other_peer the other peer
+ * @param context_msg message with application specific information from
+ * the other peer
+ * @param request request from the other peer, use GNUNET_SET_accept
+ * to accept it, otherwise the request will be refused
+ * Note that we don't use a return value here, as it is also
+ * necessary to specify the set we want to do the operation with,
+ * whith sometimes can be derived from the context message.
+ * Also necessary to specify the timeout.
*/
-void
-client_insert (void *cls,
- struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *m)
+static void
+set_listen_cb (void *cls,
+ const struct GNUNET_PeerIdentity *other_peer,
+ const struct GNUNET_MessageHeader *context_msg,
+ struct GNUNET_SET_Request *request)
{
- struct ConsensusClient *consensus_client;
- struct GNUNET_CONSENSUS_ElementMessage *msg;
- struct GNUNET_CONSENSUS_Element *element;
- struct PendingElement *pending_element;
- struct GNUNET_HashCode key;
- int element_size;
-
- GNUNET_log(GNUNET_ERROR_TYPE_INFO, "insert\n");
+ struct ConsensusSession *session = cls;
+ struct GNUNET_CONSENSUS_RoundContextMessage *msg = (struct GNUNET_CONSENSUS_RoundContextMessage *) context_msg;
+ struct ConsensusPeerInformation *cpi;
+ struct GNUNET_SET_OperationHandle *set_op;
+ struct RoundInfo round_info;
+ int index;
+ int cmp;
+
+ if (NULL == context_msg)
+ {
+ GNUNET_break_op (0);
+ return;
+ }
- consensus_client = find_client (client);
+ index = get_peer_idx (other_peer, session);
- if (NULL == consensus_client)
+ if (index < 0)
{
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "client tried to insert, but client is not in any session\n");
- GNUNET_SERVER_client_disconnect (client);
+ GNUNET_break_op (0);
return;
}
- msg = (struct GNUNET_CONSENSUS_ElementMessage *) m;
- element_size = msg->header.size - sizeof (struct GNUNET_CONSENSUS_ElementMessage);
+ round_info.round = ntohl (msg->round);
+ round_info.exp_round = ntohl (msg->exp_round);
+ round_info.exp_subround = ntohl (msg->exp_subround);
- element = GNUNET_malloc (sizeof (struct GNUNET_CONSENSUS_Element) + element_size);
+ cpi = &session->info[index];
- element->type = msg->element_type;
- element->size = element_size;
- memcpy (&element[1], &msg[1], element_size);
- element->data = &element[1];
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "P%d got set request from P%d\n", session->local_peer_idx, index);
- GNUNET_CRYPTO_hash (element, element_size, &key);
+ switch (session->current_round)
+ {
+ case CONSENSUS_ROUND_BEGIN:
+ /* we're in the begin round, so requests for the exchange round may
+ * come in, they will be delayed for now! */
+ case CONSENSUS_ROUND_EXCHANGE:
+ cmp = rounds_compare (session, &round_info);
+ if (cmp > 0)
+ {
+ /* the other peer is too late */
+ GNUNET_break_op (0);
+ return;
+ }
+ /* kill old request, if any. this is legal,
+ * as the other peer would not make a new request if it would want to
+ * complete the old one! */
+ if (NULL != cpi->set_op)
+ {
+ GNUNET_SET_operation_cancel (cpi->set_op);
+ cpi->set_op = NULL;
+ }
+ set_op = GNUNET_SET_accept (request, GNUNET_SET_RESULT_ADDED,
+ set_result_cb, &session->info[index]);
+ if (cmp == 0)
+ {
+ cpi->set_op = set_op;
+ GNUNET_SET_commit (set_op, session->element_set);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "P%d commited to set request from P%d\n", session->local_peer_idx, index);
+ }
+ else
+ {
+ /* if there's a exp subround running, mark it as finished, as the set op has been canceled! */
+ cpi->delayed_set_op = set_op;
+ cpi->delayed_round_info = round_info;
+ cpi->exp_subround_finished = GNUNET_YES;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "P%d delaying set request from P%d\n", session->local_peer_idx, index);
+ }
+ break;
+ default:
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "P%d got unexpected set request in round %d from P%d\n",
+ session->local_peer_idx, session->current_round, index);
+ GNUNET_break_op (0);
+ return;
+ }
+}
- GNUNET_CONTAINER_multihashmap_put (consensus_client->session->values, &key, element,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
- GNUNET_CONTAINER_multihashmap_put (consensus_client->values, &key, element,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
- /* send the new value to all clients that don't have it */
+/**
+ * Initialize the session, continue receiving messages from the owning client
+ *
+ * @param session the session to initialize
+ * @param join_msg the join message from the client
+ */
+static void
+initialize_session (struct ConsensusSession *session,
+ struct GNUNET_CONSENSUS_JoinMessage *join_msg)
+{
+ struct ConsensusSession *other_session;
- consensus_client = consensus_client->session->clients_head;
- while (NULL != consensus_client)
+ initialize_session_peer_list (session, join_msg);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "session with %u peers\n", session->num_peers);
+ compute_global_id (session, &join_msg->session_id);
+
+ /* check if some local client already owns the session.
+ * it is only legal to have a session with an existing global id
+ * if all other sessions with this global id are finished.*/
+ other_session = sessions_head;
+ while (NULL != other_session)
{
- if (GNUNET_NO == GNUNET_CONTAINER_multihashmap_contains (consensus_client->values, &key))
+ if ((other_session != session) &&
+ (0 == GNUNET_CRYPTO_hash_cmp (&session->global_id, &other_session->global_id)))
{
- pending_element = GNUNET_malloc (sizeof (struct PendingElement));
- pending_element->element = element;
- GNUNET_CONTAINER_DLL_insert_tail (consensus_client->pending_head, consensus_client->pending_tail, pending_element);
- GNUNET_CONTAINER_multihashmap_put (consensus_client->values, &key, element,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
- send_next (consensus_client);
+ if (CONSENSUS_ROUND_FINISH != other_session->current_round)
+ {
+ GNUNET_break (0);
+ destroy_session (session);
+ return;
+ }
+ break;
}
+ other_session = other_session->next;
}
+ session->local_peer_idx = get_peer_idx (&my_peer, session);
+ GNUNET_assert (-1 != session->local_peer_idx);
+ session->element_set = GNUNET_SET_create (cfg, GNUNET_SET_OPERATION_UNION);
+ GNUNET_assert (NULL != session->element_set);
+ session->set_listener = GNUNET_SET_listen (cfg, GNUNET_SET_OPERATION_UNION,
+ &session->global_id,
+ set_listen_cb, session);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "%d is the local peer\n", session->local_peer_idx);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "session %s initialized\n", GNUNET_h2s (&session->global_id));
+}
+
+
+static struct ConsensusSession *
+get_session_by_client (struct GNUNET_SERVER_Client *client)
+{
+ struct ConsensusSession *session;
+
+ session = sessions_head;
+ while (NULL != session)
+ {
+ if (session->client == client)
+ return session;
+ session = session->next;
+ }
+ return NULL;
+}
+
+
+/**
+ * Called when a client wants to join a consensus session.
+ *
+ * @param cls unused
+ * @param client client that sent the message
+ * @param m message sent by the client
+ */
+static void
+client_join (void *cls,
+ struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *m)
+{
+ struct ConsensusSession *session;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "join message sent by client\n");
+
+ session = get_session_by_client (client);
+ if (NULL != session)
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+ session = GNUNET_new (struct ConsensusSession);
+ session->client = client;
+ session->client_mq = GNUNET_MQ_queue_for_server_client (client);
+ GNUNET_CONTAINER_DLL_insert (sessions_head, sessions_tail, session);
+ initialize_session (session, (struct GNUNET_CONSENSUS_JoinMessage *) m);
GNUNET_SERVER_receive_done (client, GNUNET_OK);
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "join done\n");
}
/**
- * Called when a client wants to begin
+ * Called when a client performs an insert operation.
+ *
+ * @param cls (unused)
+ * @param client client handle
+ * @param m message sent by the client
*/
void
-client_begin (void *cls,
- struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
+client_insert (void *cls,
+ struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *m)
{
- struct ConsensusClient *consensus_client;
+ struct ConsensusSession *session;
+ struct GNUNET_CONSENSUS_ElementMessage *msg;
+ struct GNUNET_SET_Element *element;
+ ssize_t element_size;
- consensus_client = find_client (client);
+ session = get_session_by_client (client);
- if (NULL == consensus_client)
+ if (NULL == session)
{
+ GNUNET_break (0);
GNUNET_SERVER_client_disconnect (client);
return;
}
- consensus_client->begin = GNUNET_YES;
+ if (CONSENSUS_ROUND_BEGIN != session->current_round)
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_client_disconnect (client);
+ return;
+ }
- GNUNET_CONTAINER_multihashmap_iterate (consensus_client->session->values, &update_pending, NULL);
- send_next (consensus_client);
+ msg = (struct GNUNET_CONSENSUS_ElementMessage *) m;
+ element_size = ntohs (msg->header.size) - sizeof (struct GNUNET_CONSENSUS_ElementMessage);
+ if (element_size < 0)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ element = GNUNET_malloc (sizeof (struct GNUNET_SET_Element) + element_size);
+ element->type = msg->element_type;
+ element->size = element_size;
+ memcpy (&element[1], &msg[1], element_size);
+ element->data = &element[1];
+ GNUNET_SET_add_element (session->element_set, element, NULL, NULL);
+ GNUNET_free (element);
GNUNET_SERVER_receive_done (client, GNUNET_OK);
-}
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "P%u: element added\n", session->local_peer_idx);
+}
/**
* Called when a client performs the conclude operation.
+ *
+ * @param cls (unused)
+ * @param client client handle
+ * @param message message sent by the client
*/
-void
+static void
client_conclude (void *cls,
- struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
+ struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *message)
{
- struct ConsensusClient *consensus_client;
+ struct ConsensusSession *session;
+ struct GNUNET_CONSENSUS_ConcludeMessage *cmsg;
- consensus_client = find_client (client);
- if (NULL == consensus_client)
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "conclude requested\n");
+ cmsg = (struct GNUNET_CONSENSUS_ConcludeMessage *) message;
+ session = get_session_by_client (client);
+ if (NULL == session)
{
+ /* client not found */
+ GNUNET_break (0);
GNUNET_SERVER_client_disconnect (client);
return;
}
- consensus_client->conclude_requested = GNUNET_YES;
- send_next (consensus_client);
+ if (CONSENSUS_ROUND_BEGIN != session->current_round)
+ {
+ /* client requested conclude twice */
+ GNUNET_break (0);
+ return;
+ }
+ if (session->num_peers <= 1)
+ {
+ session->current_round = CONSENSUS_ROUND_FINISH;
+ GNUNET_SET_iterate (session->element_set, send_to_client_iter, session);
+ }
+ else
+ {
+ session->conclude_timeout = GNUNET_TIME_relative_ntoh (cmsg->timeout);
+ /* the 'begin' round is over, start with the next, actual round */
+ round_over (session, NULL);
+ }
+ GNUNET_assert (CONSENSUS_ROUND_BEGIN != session->current_round);
GNUNET_SERVER_receive_done (client, GNUNET_OK);
}
+
/**
- * Task that disconnects from core.
+ * Called to clean up, after a shutdown has been requested.
*
- * @param cls core handle
+ * @param cls closure
* @param tc context information (why was this task triggered now)
*/
static void
-disconnect_core (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
+shutdown_task (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
{
- struct GNUNET_CORE_Handle *core;
- core = (struct GNUNET_CORE_Handle *) cls;
- GNUNET_CORE_disconnect (core);
+ while (NULL != sessions_head)
+ destroy_session (sessions_head);
- GNUNET_log(GNUNET_ERROR_TYPE_INFO, "disconnected from core\n");
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "handled shutdown request\n");
}
-static void
-core_startup (void *cls,
- struct GNUNET_CORE_Handle *core,
- const struct GNUNET_PeerIdentity *peer)
+/**
+ * Clean up after a client after it is
+ * disconnected (either by us or by itself)
+ *
+ * @param cls closure, unused
+ * @param client the client to clean up after
+ */
+void
+handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
{
- static const struct GNUNET_SERVER_MessageHandler handlers[] = {
- {&client_join, NULL, GNUNET_MESSAGE_TYPE_CONSENSUS_CLIENT_JOIN, 0},
- {&client_insert, NULL, GNUNET_MESSAGE_TYPE_CONSENSUS_CLIENT_INSERT, 0},
- {&client_begin, NULL, GNUNET_MESSAGE_TYPE_CONSENSUS_CLIENT_BEGIN,
- sizeof (struct GNUNET_MessageHeader)},
- {&client_conclude, NULL, GNUNET_MESSAGE_TYPE_CONSENSUS_CLIENT_CONCLUDE,
- sizeof (struct GNUNET_CONSENSUS_ConcludeMessage)},
- {NULL, NULL, 0, 0}
- };
-
-
- GNUNET_SERVER_add_handlers (srv, handlers);
-
- my_peer = GNUNET_memdup(peer, sizeof (struct GNUNET_PeerIdentity));
-
- GNUNET_SCHEDULER_add_now (&disconnect_core, core);
+ struct ConsensusSession *session;
- GNUNET_log(GNUNET_ERROR_TYPE_INFO, "connected to core\n");
+ session = get_session_by_client (client);
+ if (NULL == session)
+ return;
+ if ((CONSENSUS_ROUND_BEGIN == session->current_round) ||
+ (CONSENSUS_ROUND_FINISH == session->current_round))
+ destroy_session (session);
+ else
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client disconnected, but waiting for consensus to finish\n");
}
/**
- * Process consensus requests.
+ * Start processing consensus 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)
+run (void *cls, struct GNUNET_SERVER_Handle *server,
+ const struct GNUNET_CONFIGURATION_Handle *c)
{
- struct GNUNET_CORE_Handle *my_core;
- static const struct GNUNET_CORE_MessageHandler handlers[] = {
- {NULL, 0, 0}
+ static const struct GNUNET_SERVER_MessageHandler server_handlers[] = {
+ {&client_conclude, NULL, GNUNET_MESSAGE_TYPE_CONSENSUS_CLIENT_CONCLUDE,
+ sizeof (struct GNUNET_CONSENSUS_ConcludeMessage)},
+ {&client_insert, NULL, GNUNET_MESSAGE_TYPE_CONSENSUS_CLIENT_INSERT, 0},
+ {&client_join, NULL, GNUNET_MESSAGE_TYPE_CONSENSUS_CLIENT_JOIN, 0},
+ {NULL, NULL, 0, 0}
};
- GNUNET_log(GNUNET_ERROR_TYPE_INFO, "run\n");
-
cfg = c;
srv = server;
- my_core = GNUNET_CORE_connect (c, NULL, &core_startup, NULL, NULL, NULL, GNUNET_NO, NULL, GNUNET_NO, handlers);
- GNUNET_assert (NULL != my_core);
+ if (GNUNET_OK != GNUNET_CRYPTO_get_peer_identity (cfg, &my_peer))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "could not retrieve host identity\n");
+ GNUNET_break (0);
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+ GNUNET_SERVER_add_handlers (server, server_handlers);
+ GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task, NULL);
+ GNUNET_SERVER_disconnect_notify (server, handle_client_disconnect, NULL);
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO, "consensus running\n");
}
/**
- * The main function for the statistics service.
+ * The main function for the consensus service.
*
* @param argc number of arguments from the command line
* @param argv command line arguments
int
main (int argc, char *const *argv)
{
- return (GNUNET_OK ==
- GNUNET_SERVICE_run (argc, argv, "consensus", GNUNET_SERVICE_OPTION_NONE, &run, NULL)) ? 0 : 1;
+ int ret;
+ ret = GNUNET_SERVICE_run (argc, argv, "consensus", GNUNET_SERVICE_OPTION_NONE, &run, NULL);
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO, "exit (%d)\n", GNUNET_OK != ret);
+ return (GNUNET_OK == ret) ? 0 : 1;
}