/*
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
*/
#include "platform.h"
-#include "gnunet_common.h"
+#include "gnunet_util_lib.h"
#include "gnunet_protocols.h"
#include "gnunet_applications.h"
-#include "gnunet_util_lib.h"
+#include "gnunet_set_service.h"
#include "gnunet_consensus_service.h"
-#include "gnunet_core_service.h"
-#include "gnunet_stream_lib.h"
#include "consensus_protocol.h"
-#include "ibf.h"
#include "consensus.h"
/**
- * Number of IBFs in a strata estimator.
- */
-#define STRATA_COUNT 32
-/**
- * Number of buckets per IBF.
- */
-#define STRATA_IBF_BUCKETS 80
-/**
- * hash num parameter for the difference digests and strata estimators
- */
-#define STRATA_HASH_NUM 3
-
-/**
- * Number of buckets that can be transmitted in one message.
+ * Log macro that prefixes the local peer and the peer we are in contact with.
*/
-#define BUCKETS_PER_MESSAGE ((1<<15) / IBF_BUCKET_SIZE)
+#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__)
-/**
- * The maximum size of an ibf we use is 2^(MAX_IBF_ORDER).
- * Choose this value so that computing the IBF is still cheaper
- * than transmitting all values.
- */
-#define MAX_IBF_ORDER (16)
/**
- * Number exp-rounds.
+ * Number of exponential rounds, used in the exp and completion round.
*/
-#define NUM_EXP_ROUNDS (4)
-
+#define NUM_EXP_ROUNDS 4
/* forward declarations */
-struct ConsensusSession;
-struct IncomingSocket;
+/* mutual recursion with struct ConsensusSession */
struct ConsensusPeerInformation;
-static void
-client_send_next (struct ConsensusSession *session);
-
-static int
-get_peer_idx (const struct GNUNET_PeerIdentity *peer, const struct ConsensusSession *session);
-
-static void
-round_over (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
-
-static void
-send_ibf (struct ConsensusPeerInformation *cpi);
-
-static void
-send_strata_estimator (struct ConsensusPeerInformation *cpi);
-
-static void
-decode (struct ConsensusPeerInformation *cpi);
-
-static void
-write_queued (void *cls, enum GNUNET_STREAM_Status status, size_t size);
-
+/* mutual recursion with round_over */
static void
subround_over (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
-/**
- * An element that is waiting to be transmitted to the client.
- */
-struct PendingElement
-{
- /**
- * Pending elements are kept in a DLL.
- */
- struct PendingElement *next;
-
- /**
- * Pending elements are kept in a DLL.
- */
- struct PendingElement *prev;
-
- /**
- * The actual element
- */
- struct GNUNET_CONSENSUS_Element *element;
-
- /* peer this element is coming from */
- struct ConsensusPeerInformation *cpi;
-};
-
-
-struct ElementList
-{
- struct ElementList *next;
- struct GNUNET_CONSENSUS_Element *element;
- struct GNUNET_HashCode *element_hash;
-};
-
-
/**
* Describes the current round a consensus session is in.
*/
*/
CONSENSUS_ROUND_EXCHANGE,
/**
- * Exchange which elements each peer has, but not the elements.
+ * 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.
+ * Collect and distribute missing values with the exponential scheme.
*/
- CONSENSUS_ROUND_STOCK,
+ CONSENSUS_ROUND_COMPLETION,
/**
- * Consensus concluded.
+ * Consensus concluded. After timeout and finished communication with client,
+ * consensus session will be destroyed.
*/
CONSENSUS_ROUND_FINISH
};
/**
- * Information about a peer that is in a consensus session.
+ * Complete information about the current round and all
+ * subrounds.
*/
-struct ConsensusPeerInformation
+struct RoundInfo
{
- struct GNUNET_PeerIdentity peer_id;
-
- /**
- * Socket for communicating with the peer, either created by the local peer,
- * or the remote peer.
- */
- struct GNUNET_STREAM_Socket *socket;
-
- /**
- * Message tokenizer, for the data received from this peer via the stream socket.
- */
- struct GNUNET_SERVER_MessageStreamTokenizer *mst;
-
- /**
- * Do we connect to the peer, or does the peer connect to us?
- * Only valid for all-to-all phases
- */
- int is_outgoing;
-
- /**
- * Did we receive/send a consensus hello?
- */
- int hello;
-
- /**
- * Handle for currently active read
- */
- struct GNUNET_STREAM_ReadHandle *rh;
-
- /**
- * Handle for currently active read
- */
- struct GNUNET_STREAM_WriteHandle *wh;
-
- enum {
- /* beginning of round */
- IBF_STATE_NONE=0,
- /* we currently receive an ibf */
- IBF_STATE_RECEIVING,
- /* we currently transmit an ibf */
- IBF_STATE_TRANSMITTING,
- /* we decode a received ibf */
- IBF_STATE_DECODING,
- /* wait for elements and element requests */
- IBF_STATE_ANTICIPATE_DIFF
- } ibf_state ;
-
- /**
- * What is the order (=log2 size) of the ibf
- * we're currently dealing with?
- * Interpretation depends on ibf_state.
- */
- int ibf_order;
-
- /**
- * The current IBF for this peer,
- * purpose dependent on ibf_state
- */
- struct InvertibleBloomFilter *ibf;
-
- /**
- * How many buckets have we transmitted/received?
- * Interpretatin depends on ibf_state
- */
- int ibf_bucket_counter;
-
- /**
- * Strata estimator of the peer, NULL if our peer
- * initiated the reconciliation.
- */
- struct StrataEstimator *se;
-
- /**
- * Element keys that this peer misses, but we have them.
- */
- struct GNUNET_CONTAINER_MultiHashMap *requested_keys;
-
- /**
- * Element keys that this peer has, but we miss.
- */
- struct GNUNET_CONTAINER_MultiHashMap *reported_keys;
-
- /**
- * Back-reference to the consensus session,
- * to that ConsensusPeerInformation can be used as a closure
- */
- struct ConsensusSession *session;
-
- /**
- * Messages queued for the current round.
- */
- struct QueuedMessage *messages_head;
-
- /**
- * Messages queued for the current round.
- */
- struct QueuedMessage *messages_tail;
-
/**
- * True if we are actually replaying the strata message,
- * e.g. currently handling the premature_strata_message.
+ * The current main round.
*/
- int replaying_strata_message;
-
- /**
- * A strata message that is not actually for the current round,
- * used in the exp-scheme.
- */
- struct StrataMessage *premature_strata_message;
-
- /**
- * We have finishes the exp-subround with the peer.
- */
- int exp_subround_finished;
-
- int inventory_synced;
-
- /**
- * Round this peer seems to be in, according to the last SE we got.
- * Necessary to store this, as we sometimes need to respond to a request from an
- * older round, while we are already in the next round.
- */
- enum ConsensusRound apparent_round;
-
-};
-
-typedef void (*QueuedMessageCallback) (void *msg);
-
-/**
- * A doubly linked list of messages.
- */
-struct QueuedMessage
-{
- struct GNUNET_MessageHeader *msg;
-
+ enum ConsensusRound round;
/**
- * Queued messages are stored in a doubly linked list.
+ * The current exp round, valid if
+ * the main round is an exp round.
*/
- struct QueuedMessage *next;
-
+ uint32_t exp_round;
/**
- * Queued messages are stored in a doubly linked list.
+ * The current exp subround, valid if
+ * the main round is an exp round.
*/
- struct QueuedMessage *prev;
-
- QueuedMessageCallback cb;
-
- void *cls;
-};
-
-
-struct StrataEstimator
-{
- struct InvertibleBloomFilter **strata;
+ uint32_t exp_subround;
};
*/
struct ConsensusSession *prev;
- /**
- * Join message. Used to initialize the session later,
- * if the identity of the local peer is not yet known.
- * NULL if the session has been fully initialized.
- */
- struct GNUNET_CONSENSUS_JoinMessage *join_msg;
-
/**
* Global consensus identification, computed
* from the session id and participating authorities.
struct GNUNET_HashCode global_id;
/**
- * Local client in this consensus session.
- * There is only one client per consensus session.
+ * Client that inhabits the session
*/
struct GNUNET_SERVER_Client *client;
/**
- * Elements in the consensus set of this session,
- * all of them either have been sent by or approved by the client.
- * Contains ElementList.
- * Used as a unique-key hashmap.
- */
- struct GNUNET_CONTAINER_MultiHashMap *values;
-
- /**
- * Elements that have not been approved (or rejected) by the client yet.
+ * Queued messages to the client.
*/
- struct PendingElement *client_approval_head;
+ struct GNUNET_MQ_Handle *client_mq;
/**
- * Elements that have not been approved (or rejected) by the client yet.
+ * Time when the conclusion of the consensus should begin.
*/
- struct PendingElement *client_approval_tail;
-
- /**
- * Messages to be sent to the local client that owns this session
- */
- struct QueuedMessage *client_messages_head;
-
- /**
- * Messages to be sent to the local client that owns this session
- */
- struct QueuedMessage *client_messages_tail;
-
- /**
- * Currently active transmit handle for sending to the client
- */
- struct GNUNET_SERVER_TransmitHandle *client_th;
+ struct GNUNET_TIME_Absolute conclude_start;
/**
* 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;
-
+ struct GNUNET_TIME_Absolute conclude_deadline;
+
/**
- * Timeout task identifier for the current round
+ * Timeout task identifier for the current round.
*/
GNUNET_SCHEDULER_TaskIdentifier round_timeout_tid;
/**
- * Number of other peers in the consensus
+ * Number of other peers in the consensus.
*/
unsigned int num_peers;
/**
* Index of the local peer in the peers array
*/
- int local_peer_idx;
+ unsigned int local_peer_idx;
/**
- * Strata estimator, computed online
+ * Current round
*/
- struct StrataEstimator *se;
+ enum ConsensusRound current_round;
/**
- * Pre-computed IBFs
+ * Permutation of peers for the current round,
*/
- struct InvertibleBloomFilter **ibfs;
+ uint32_t *shuffle;
/**
- * Current round
+ * Inverse permutation of peers for the current round,
*/
- enum ConsensusRound current_round;
-
- int exp_round;
+ uint32_t *shuffle_inv;
- int exp_subround;
+ /**
+ * Current round of the exponential scheme.
+ */
+ uint32_t exp_round;
/**
- * Permutation of peers for the current round,
- * maps logical index (for current round) to physical index (location in info array)
+ * Current sub-round of the exponential scheme.
*/
- int *shuffle;
+ uint32_t exp_subround;
/**
* The partner for the current exp-round
*/
- struct ConsensusPeerInformation* partner_outgoing;
+ struct ConsensusPeerInformation *partner_outgoing;
/**
* The partner for the current exp-round
*/
- struct ConsensusPeerInformation* partner_incoming;
-};
+ struct ConsensusPeerInformation *partner_incoming;
-
-/**
- * Sockets from other peers who want to communicate with us.
- * It may not be known yet which consensus session they belong to.
- * Also, the session might not exist yet locally.
- */
-struct IncomingSocket
-{
/**
- * Incoming sockets are kept in a double linked list.
+ * The consensus set of this session.
*/
- struct IncomingSocket *next;
+ struct GNUNET_SET_Handle *element_set;
/**
- * Incoming sockets are kept in a double linked list.
+ * Listener for requests from other peers.
+ * Uses the session's global id as app id.
*/
- struct IncomingSocket *prev;
+ struct GNUNET_SET_ListenHandle *set_listener;
+};
+
+/**
+ * Information about a peer that is in a consensus session.
+ */
+struct ConsensusPeerInformation
+{
/**
- * The actual socket.
+ * Peer identitty of the peer in the consensus session
*/
- struct GNUNET_STREAM_Socket *socket;
+ struct GNUNET_PeerIdentity peer_id;
/**
- * Handle for currently active read
+ * Back-reference to the consensus session,
+ * to that ConsensusPeerInformation can be used as a closure
*/
- struct GNUNET_STREAM_ReadHandle *rh;
+ struct ConsensusSession *session;
/**
- * Peer that connected to us with the socket.
+ * We have finishes the exp-subround with the peer.
*/
- struct GNUNET_PeerIdentity peer_id;
+ int exp_subround_finished;
/**
- * Message stream tokenizer for this socket.
+ * Set operation we are currently executing with this peer.
*/
- struct GNUNET_SERVER_MessageStreamTokenizer *mst;
+ struct GNUNET_SET_OperationHandle *set_op;
/**
- * Peer-in-session this socket belongs to, once known, otherwise NULL.
+ * Set operation we are planning on executing with this peer.
*/
- struct ConsensusPeerInformation *cpi;
+ struct GNUNET_SET_OperationHandle *delayed_set_op;
/**
- * Set to the global session id, if the peer sent us a hello-message,
- * but the session does not exist yet.
+ * Info about the round of the delayed set operation.
*/
- struct GNUNET_HashCode *requested_gid;
+ struct RoundInfo delayed_round_info;
};
-static struct IncomingSocket *incoming_sockets_head;
-static struct IncomingSocket *incoming_sockets_tail;
-
/**
- * 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;
/**
* Peer that runs this service.
*/
-static struct GNUNET_PeerIdentity *my_peer;
+static struct GNUNET_PeerIdentity my_peer;
-/**
- * Handle to the core service. Only used during service startup, will be NULL after that.
- */
-static struct GNUNET_CORE_Handle *core;
-
-/**
- * Listener for sockets from peers that want to reconcile with us.
- */
-static struct GNUNET_STREAM_ListenSocket *listener;
-
-
-/**
- * Queue a message to be sent to the inhabiting client of a session.
- *
- * @param session session
- * @param msg message we want to queue
- */
-static void
-queue_client_message (struct ConsensusSession *session, struct GNUNET_MessageHeader *msg)
-{
- struct QueuedMessage *qm;
- qm = GNUNET_malloc (sizeof *qm);
- qm->msg = msg;
- GNUNET_CONTAINER_DLL_insert_tail (session->client_messages_head, session->client_messages_tail, qm);
-}
-/**
- * Queue a message to be sent to another peer
- *
- * @param cpi peer
- * @param msg message we want to queue
- * @param cb callback, called when the message is given to strem
- * @param cls closure for cb
- */
-static void
-queue_peer_message_with_cls (struct ConsensusPeerInformation *cpi, struct GNUNET_MessageHeader *msg, QueuedMessageCallback cb, void *cls)
+static int
+have_exp_subround_finished (const struct ConsensusSession *session)
{
- struct QueuedMessage *qm;
- qm = GNUNET_malloc (sizeof *qm);
- qm->msg = msg;
- qm->cls = cls;
- qm->cb = cb;
- GNUNET_CONTAINER_DLL_insert_tail (cpi->messages_head, cpi->messages_tail, qm);
- if (cpi->wh == NULL)
- write_queued (cpi, GNUNET_STREAM_OK, 0);
+ 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;
}
/**
- * Queue a message to be sent to another peer
+ * Destroy a session, free all resources associated with it.
*
- * @param cpi peer
- * @param msg message we want to queue
+ * @param session the session to destroy
*/
static void
-queue_peer_message (struct ConsensusPeerInformation *cpi, struct GNUNET_MessageHeader *msg)
-{
- queue_peer_message_with_cls (cpi, msg, NULL, NULL);
-}
-
-
-/*
-static void
-clear_peer_messages (struct ConsensusPeerInformation *cpi)
-{
- cpi->messages_head = NULL;
- cpi->messages_tail = NULL;
-}
-*/
-
-
-/**
- * Estimate set difference with two strata estimators,
- * i.e. arrays of IBFs.
- * Does not not modify its arguments.
- *
- * @param se1 first strata estimator
- * @param se2 second strata estimator
- * @return the estimated difference
- */
-static int
-estimate_difference (const struct StrataEstimator *se1,
- const struct StrataEstimator *se2)
+destroy_session (struct ConsensusSession *session)
{
int i;
- int count;
- count = 0;
- for (i = STRATA_COUNT - 1; i >= 0; 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)
+ {
+ 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)
{
- struct InvertibleBloomFilter *diff;
- /* number of keys decoded from the ibf */
- int ibf_count;
- int more;
- ibf_count = 0;
- /* FIXME: implement this without always allocating new IBFs */
- diff = ibf_dup (se1->strata[i]);
- ibf_subtract (diff, se2->strata[i]);
- for (;;)
+ GNUNET_free (session->shuffle_inv);
+ session->shuffle_inv = NULL;
+ }
+ if (NULL != session->info)
+ {
+ for (i = 0; i < session->num_peers; i++)
{
- more = ibf_decode (diff, NULL, NULL);
- if (GNUNET_NO == more)
- {
- count += ibf_count;
- break;
- }
- if (GNUNET_SYSERR == more)
+ struct ConsensusPeerInformation *cpi;
+ cpi = &session->info[i];
+ if (NULL != cpi->set_op)
{
- ibf_destroy (diff);
- return count * (1 << (i + 1));
+ GNUNET_SET_operation_cancel (cpi->set_op);
+ cpi->set_op = NULL;
}
- ibf_count++;
}
- ibf_destroy (diff);
+ GNUNET_free (session->info);
+ session->info = NULL;
}
- return count;
+ GNUNET_free (session);
}
/**
- * Called when receiving data from a peer that is member of
- * an inhabited consensus session.
+ * Iterator for set elements.
*
- * @param cls the closure from GNUNET_STREAM_read
- * @param status the status of the stream at the time this function is called
- * @param data traffic from the other side
- * @param size the number of bytes available in data read; will be 0 on timeout
- * @return number of bytes of processed from 'data' (any data remaining should be
- * given to the next time the read processor is called).
+ * @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 size_t
-session_stream_data_processor (void *cls,
- enum GNUNET_STREAM_Status status,
- const void *data,
- size_t size)
+static int
+send_to_client_iter (void *cls,
+ const struct GNUNET_SET_Element *element)
{
- struct ConsensusPeerInformation *cpi;
- int ret;
+ struct ConsensusSession *session = cls;
+ struct GNUNET_MQ_Envelope *ev;
+
+ 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);
- GNUNET_assert (GNUNET_STREAM_OK == status);
- cpi = cls;
- GNUNET_assert (NULL != cpi->mst);
- ret = GNUNET_SERVER_mst_receive (cpi->mst, cpi, data, size, GNUNET_NO, GNUNET_YES);
- if (GNUNET_SYSERR == ret)
+ 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
{
- /* FIXME: handle this correctly */
- GNUNET_assert (0);
+ 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);
}
- /* read again */
- cpi->rh = GNUNET_STREAM_read (cpi->socket, GNUNET_TIME_UNIT_FOREVER_REL,
- &session_stream_data_processor, cpi);
- /* we always read all data */
- return size;
+ return GNUNET_YES;
}
+
/**
- * Called when we receive data from a peer that is not member of
- * a session yet, or the session is not yet inhabited.
+ * Start the next round.
+ * This function can be invoked as a timeout task, or called manually (tc will be NULL then).
*
- * @param cls the closure from GNUNET_STREAM_read
- * @param status the status of the stream at the time this function is called
- * @param data traffic from the other side
- * @param size the number of bytes available in data read; will be 0 on timeout
- * @return number of bytes of processed from 'data' (any data remaining should be
- * given to the next time the read processor is called).
+ * @param cls the session
+ * @param tc task context, for when this task is invoked by the scheduler,
+ * NULL if invoked for another reason
*/
-static size_t
-incoming_stream_data_processor (void *cls,
- enum GNUNET_STREAM_Status status,
- const void *data,
- size_t size)
+static void
+round_over (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
- struct IncomingSocket *incoming;
- int ret;
+ struct ConsensusSession *session;
- GNUNET_assert (GNUNET_STREAM_OK == status);
- incoming = cls;
- ret = GNUNET_SERVER_mst_receive (incoming->mst, incoming, data, size, GNUNET_NO, GNUNET_YES);
- if (GNUNET_SYSERR == ret)
- {
- /* FIXME: handle this correctly */
- GNUNET_assert (0);
- }
- /* read again */
- incoming->rh = GNUNET_STREAM_read (incoming->socket, GNUNET_TIME_UNIT_FOREVER_REL,
- &incoming_stream_data_processor, incoming);
- /* we always read all data */
- return size;
-}
-
-
-static void
-send_elements (struct ConsensusPeerInformation *cpi, struct ElementList *head)
-{
- struct GNUNET_CONSENSUS_Element *element;
- struct GNUNET_MessageHeader *element_msg;
- size_t msize;
-
- while (NULL != head)
- {
- element = head->element;
- msize = sizeof (struct GNUNET_MessageHeader) + element->size;
- element_msg = GNUNET_malloc (msize);
- element_msg->size = htons (msize);
- switch (cpi->apparent_round)
- {
- case CONSENSUS_ROUND_STOCK:
- case CONSENSUS_ROUND_EXCHANGE:
- element_msg->type = htons (GNUNET_MESSAGE_TYPE_CONSENSUS_P2P_ELEMENTS);
- break;
- case CONSENSUS_ROUND_INVENTORY:
- element_msg->type = htons (GNUNET_MESSAGE_TYPE_CONSENSUS_P2P_ELEMENTS_REPORT);
- break;
- default:
- GNUNET_break (0);
- }
- GNUNET_assert (NULL != element->data);
- memcpy (&element_msg[1], element->data, element->size);
- queue_peer_message (cpi, element_msg);
- head = head->next;
- }
-}
-
-/**
- * Iterator to insert values into an ibf.
- *
- * @param cls closure
- * @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.
- */
-static int
-ibf_values_iterator (void *cls,
- const struct GNUNET_HashCode *key,
- void *value)
-{
- struct ConsensusPeerInformation *cpi;
- struct ElementList *head;
- struct IBF_Key ibf_key;
- cpi = cls;
- head = value;
- ibf_key = ibf_key_from_hashcode (head->element_hash);
- GNUNET_assert (ibf_key.key_val == ibf_key_from_hashcode (key).key_val);
- ibf_insert (cpi->session->ibfs[cpi->ibf_order], ibf_key);
- return GNUNET_YES;
-}
-
-/**
- * Create and populate an IBF for the specified peer,
- * if it does not already exist.
- *
- * @param cpi peer to create the ibf for
- */
-static void
-prepare_ibf (struct ConsensusPeerInformation *cpi)
-{
- if (NULL == cpi->session->ibfs[cpi->ibf_order])
- {
- cpi->session->ibfs[cpi->ibf_order] = ibf_create (1 << cpi->ibf_order, STRATA_HASH_NUM, 0);
- GNUNET_CONTAINER_multihashmap_iterate (cpi->session->values, ibf_values_iterator, cpi);
- }
-}
-
-
-/**
- * Called when a remote peer wants to inform the local peer
- * that the remote peer misses elements.
- * Elements are not reconciled.
- *
- * @param cpi session
- * @param msg message
- */
-static int
-handle_p2p_element_report (struct ConsensusPeerInformation *cpi, const struct GNUNET_MessageHeader *msg)
-{
- GNUNET_assert (0);
-}
-
-
-static int
-exp_subround_finished (const struct ConsensusSession *session)
-{
- int not_finished;
- not_finished = 0;
- if ((session->partner_outgoing != NULL) && (session->partner_outgoing->exp_subround_finished == GNUNET_NO))
- not_finished++;
- if ((session->partner_incoming != NULL) && (session->partner_incoming->exp_subround_finished == GNUNET_NO))
- not_finished++;
- if (0 == not_finished)
- return GNUNET_YES;
- return GNUNET_NO;
-}
-
-static int
-inventory_round_finished (struct ConsensusSession *session)
-{
- int i;
- int finished;
- finished = 0;
- for (i = 0; i < session->num_peers; i++)
- if (GNUNET_YES == session->info[i].inventory_synced)
- finished++;
- if (finished >= (session->num_peers / 2))
- return GNUNET_YES;
- return GNUNET_NO;
-}
-
-
-
-static void
-fin_sent_cb (void *cls)
-{
- struct ConsensusPeerInformation *cpi;
- cpi = cls;
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%d: sent FIN\n", cpi->session->local_peer_idx);
- switch (cpi->session->current_round)
- {
- case CONSENSUS_ROUND_EXCHANGE:
- case CONSENSUS_ROUND_STOCK:
- if (cpi->session->current_round != cpi->apparent_round)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%d: FIN to SYNC from the past\n", cpi->session->local_peer_idx);
- break;
- }
- cpi->exp_subround_finished = GNUNET_YES;
- /* the subround is only really over if *both* partners are done */
- if (GNUNET_YES == exp_subround_finished (cpi->session))
- subround_over (cpi->session, NULL);
- else
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%d: still waiting for more after FIN sent\n", cpi->session->local_peer_idx);
- break;
- case CONSENSUS_ROUND_INVENTORY:
- cpi->inventory_synced = GNUNET_YES;
- if (inventory_round_finished (cpi->session) && cpi->session->current_round == cpi->apparent_round)
- round_over (cpi->session, NULL);
- /* FIXME: maybe go to next round */
- break;
- default:
- GNUNET_break (0);
- }
-}
-
-
-/**
- * Gets called when the other peer wants us to inform that
- * it has decoded our ibf and sent us all elements / requests
- */
-static int
-handle_p2p_synced (struct ConsensusPeerInformation *cpi, const struct GNUNET_MessageHeader *msg)
-{
- struct ConsensusRoundMessage *fin_msg;
-
- switch (cpi->session->current_round)
- {
- case CONSENSUS_ROUND_INVENTORY:
- cpi->inventory_synced = GNUNET_YES;
- case CONSENSUS_ROUND_STOCK:
- case CONSENSUS_ROUND_EXCHANGE:
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%d: got SYNC from P%d\n", cpi->session->local_peer_idx, (int) (cpi - cpi->session->info));
- fin_msg = GNUNET_malloc (sizeof *fin_msg);
- fin_msg->header.type = htons (GNUNET_MESSAGE_TYPE_CONSENSUS_P2P_FIN);
- fin_msg->header.size = htons (sizeof *fin_msg);
- fin_msg->round = cpi->apparent_round;
- /* the subround os over once we kicked off sending the fin msg */
- /* FIXME: assert we are talking to the right peer! */
- queue_peer_message_with_cls (cpi, (struct GNUNET_MessageHeader *) fin_msg, fin_sent_cb, cpi);
- /* FIXME: mark peer as synced */
- break;
- default:
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "unexpected SYNCED message the current round\n");
- break;
- }
- return GNUNET_YES;
-}
-
-
-/**
- * The other peer wants us to inform that he sent us all the elements we requested.
- */
-static int
-handle_p2p_fin (struct ConsensusPeerInformation *cpi, const struct GNUNET_MessageHeader *msg)
-{
- struct ConsensusRoundMessage *round_msg;
- round_msg = (struct ConsensusRoundMessage *) msg;
- /* FIXME: only call subround_over if round is the current one! */
- switch (cpi->session->current_round)
- {
- case CONSENSUS_ROUND_EXCHANGE:
- case CONSENSUS_ROUND_STOCK:
- if (cpi->session->current_round != round_msg->round)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%d: got FIN from P%d (past round)\n", cpi->session->local_peer_idx, (int) (cpi - cpi->session->info));
- cpi->ibf_state = IBF_STATE_NONE;
- cpi->ibf_bucket_counter = 0;
- break;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%d: got FIN from P%d (exp)\n", cpi->session->local_peer_idx, (int) (cpi - cpi->session->info));
- cpi->exp_subround_finished = GNUNET_YES;
- if (GNUNET_YES == exp_subround_finished (cpi->session))
- subround_over (cpi->session, NULL);
- else
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%d: still waiting for more after got FIN\n", cpi->session->local_peer_idx);
- break;
- case CONSENSUS_ROUND_INVENTORY:
- cpi->inventory_synced = GNUNET_YES;
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%d: got FIN from P%d (a2a)\n", cpi->session->local_peer_idx, (int) (cpi - cpi->session->info));
- if (inventory_round_finished (cpi->session))
- round_over (cpi->session, NULL);
- break;
- default:
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "unexpected FIN message the current round\n");
- break;
- }
- return GNUNET_YES;
-}
-
-
-static struct StrataEstimator *
-strata_estimator_create ()
-{
- struct StrataEstimator *se;
- int i;
-
- /* fixme: allocate everything in one chunk */
-
- se = GNUNET_malloc (sizeof (struct StrataEstimator));
- se->strata = GNUNET_malloc (sizeof (struct InvertibleBloomFilter) * STRATA_COUNT);
- for (i = 0; i < STRATA_COUNT; i++)
- se->strata[i] = ibf_create (STRATA_IBF_BUCKETS, STRATA_HASH_NUM, 0);
-
- return se;
-}
-
-static void
-strata_estimator_destroy (struct StrataEstimator *se)
-{
- int i;
- for (i = 0; i < STRATA_COUNT; i++)
- ibf_destroy (se->strata[i]);
- GNUNET_free (se->strata);
- GNUNET_free (se);
-}
-
-
-static int
-is_premature_strata_message (const struct ConsensusSession *session, const struct StrataMessage *strata_msg)
-{
- switch (strata_msg->round)
- {
- case CONSENSUS_ROUND_STOCK:
- case CONSENSUS_ROUND_EXCHANGE:
- /* here, we also have to compare subrounds */
- if ( (strata_msg->round != session->current_round) ||
- (strata_msg->exp_round != session->exp_round) ||
- (strata_msg->exp_subround != session->exp_subround))
- return GNUNET_YES;
- break;
- default:
- if (session->current_round != strata_msg->round)
- return GNUNET_YES;
- break;
- }
- return GNUNET_NO;
-}
-
-
-/**
- * Called when a peer sends us its strata estimator.
- * In response, we sent out IBF of appropriate size back.
- *
- * @param cpi session
- * @param strata_msg message
- */
-static int
-handle_p2p_strata (struct ConsensusPeerInformation *cpi, const struct StrataMessage *strata_msg)
-{
- int i;
- unsigned int diff;
- void *buf;
- size_t size;
-
- if ((cpi->session->current_round == CONSENSUS_ROUND_STOCK) && (strata_msg->round == CONSENSUS_ROUND_INVENTORY))
- {
- /* we still have to handle this request appropriately */
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%d: got inventory SE from P%d, we are already further alog\n",
- cpi->session->local_peer_idx, (int) (cpi - cpi->session->info));
- }
- else if (is_premature_strata_message (cpi->session, strata_msg))
- {
- if (GNUNET_NO == cpi->replaying_strata_message)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%d: got probably premature SE from P%d, (%d,%d)\n",
- cpi->session->local_peer_idx, (int) (cpi - cpi->session->info), strata_msg->exp_round, strata_msg->exp_subround);
- cpi->premature_strata_message = (struct StrataMessage *) GNUNET_copy_message ((struct GNUNET_MessageHeader *) strata_msg);
- }
- return GNUNET_YES;
- }
-
- if (NULL == cpi->se)
- cpi->se = strata_estimator_create ();
-
- cpi->apparent_round = strata_msg->round;
-
- size = ntohs (strata_msg->header.size);
- buf = (void *) &strata_msg[1];
- for (i = 0; i < STRATA_COUNT; i++)
- {
- int res;
- res = ibf_read (&buf, &size, cpi->se->strata[i]);
- GNUNET_assert (GNUNET_OK == res);
- }
-
- diff = estimate_difference (cpi->session->se, cpi->se);
-
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%d: got SE from P%d, diff=%d\n",
- cpi->session->local_peer_idx, (int) (cpi - cpi->session->info), diff);
-
- switch (cpi->session->current_round)
- {
- case CONSENSUS_ROUND_EXCHANGE:
- case CONSENSUS_ROUND_INVENTORY:
- case CONSENSUS_ROUND_STOCK:
- /* send IBF of the right size */
- cpi->ibf_order = 0;
- while (((1 << cpi->ibf_order) < diff) || STRATA_HASH_NUM > (1 << cpi->ibf_order) )
- cpi->ibf_order++;
- if (cpi->ibf_order > MAX_IBF_ORDER)
- cpi->ibf_order = MAX_IBF_ORDER;
- cpi->ibf_order += 1;
- /* create ibf if not already pre-computed */
- prepare_ibf (cpi);
- if (NULL != cpi->ibf)
- ibf_destroy (cpi->ibf);
- cpi->ibf = ibf_dup (cpi->session->ibfs[cpi->ibf_order]);
- cpi->ibf_state = IBF_STATE_TRANSMITTING;
- cpi->ibf_bucket_counter = 0;
- send_ibf (cpi);
- break;
- default:
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%d: got unexpected SE from P%d\n",
- cpi->session->local_peer_idx, (int) (cpi - cpi->session->info));
- break;
- }
- return GNUNET_YES;
-}
-
-
-static int
-handle_p2p_ibf (struct ConsensusPeerInformation *cpi, const struct DifferenceDigest *digest)
-{
- int num_buckets;
- void *buf;
-
- /* FIXME: find out if we're still expecting the same ibf! */
-
- cpi->apparent_round = cpi->session->current_round;
-
- num_buckets = (ntohs (digest->header.size) - (sizeof *digest)) / IBF_BUCKET_SIZE;
- switch (cpi->ibf_state)
- {
- case IBF_STATE_NONE:
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%d: receiving IBF from P%d\n", cpi->session->local_peer_idx, (int) (cpi - cpi->session->info));
- cpi->ibf_state = IBF_STATE_RECEIVING;
- cpi->ibf_order = digest->order;
- cpi->ibf_bucket_counter = 0;
- if (NULL != cpi->ibf)
- {
- ibf_destroy (cpi->ibf);
- cpi->ibf = NULL;
- }
- break;
- case IBF_STATE_ANTICIPATE_DIFF:
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%d: receiving IBF from P%d (probably out IBF did not decode)\n",
- cpi->session->local_peer_idx, (int) (cpi - cpi->session->info));
- cpi->ibf_state = IBF_STATE_RECEIVING;
- cpi->ibf_order = digest->order;
- cpi->ibf_bucket_counter = 0;
- if (NULL != cpi->ibf)
- {
- ibf_destroy (cpi->ibf);
- cpi->ibf = NULL;
- }
- break;
- case IBF_STATE_RECEIVING:
- break;
- default:
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%d: unexpected IBF from P%d\n", cpi->session->local_peer_idx, (int) (cpi - cpi->session->info));
- return GNUNET_YES;
- }
-
- if (cpi->ibf_bucket_counter + num_buckets > (1 << cpi->ibf_order))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%d: overfull IBF from P%d\n", cpi->session->local_peer_idx, (int) (cpi - cpi->session->info));
- return GNUNET_YES;
- }
-
-
- if (NULL == cpi->ibf)
- cpi->ibf = ibf_create (1 << cpi->ibf_order, STRATA_HASH_NUM, 0);
-
- buf = (void *) &digest[1];
- ibf_read_slice (&buf, NULL, cpi->ibf_bucket_counter, num_buckets, cpi->ibf);
-
- cpi->ibf_bucket_counter += num_buckets;
-
- if (cpi->ibf_bucket_counter == (1 << cpi->ibf_order))
- {
- cpi->ibf_state = IBF_STATE_DECODING;
- cpi->ibf_bucket_counter = 0;
- prepare_ibf (cpi);
- ibf_subtract (cpi->ibf, cpi->session->ibfs[cpi->ibf_order]);
- decode (cpi);
- }
- return GNUNET_YES;
-}
-
-
-/**
- * Handle an element that another peer sent us
- */
-static int
-handle_p2p_element (struct ConsensusPeerInformation *cpi, const struct GNUNET_MessageHeader *element_msg)
-{
- struct PendingElement *pending_element;
- struct GNUNET_CONSENSUS_Element *element;
- struct GNUNET_CONSENSUS_ElementMessage *client_element_msg;
- size_t size;
-
- switch (cpi->session->current_round)
- {
- case CONSENSUS_ROUND_STOCK:
- /* FIXME: check if we really expect the element */
- case CONSENSUS_ROUND_EXCHANGE:
- break;
- default:
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "got unexpected element, ignoring\n");
- return GNUNET_YES;
- }
-
- size = ntohs (element_msg->size) - sizeof *element_msg;
-
- element = GNUNET_malloc (size + sizeof *element);
- element->size = size;
- memcpy (&element[1], &element_msg[1], size);
- element->data = &element[1];
-
- pending_element = GNUNET_malloc (sizeof *pending_element);
- pending_element->element = element;
- GNUNET_CONTAINER_DLL_insert_tail (cpi->session->client_approval_head, cpi->session->client_approval_tail, pending_element);
-
- client_element_msg = GNUNET_malloc (size + sizeof *client_element_msg);
- client_element_msg->header.type = htons (GNUNET_MESSAGE_TYPE_CONSENSUS_CLIENT_RECEIVED_ELEMENT);
- client_element_msg->header.size = htons (size + sizeof *client_element_msg);
- memcpy (&client_element_msg[1], &element[1], size);
-
- queue_client_message (cpi->session, (struct GNUNET_MessageHeader *) client_element_msg);
-
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "received element, size=%d\n", size);
-
- client_send_next (cpi->session);
-
- return GNUNET_YES;
-}
-
-
-/**
- * Handle a request for elements.
- *
- * @param cpi peer that is requesting the element
- * @param msg the element request message
- */
-static int
-handle_p2p_element_request (struct ConsensusPeerInformation *cpi, const struct ElementRequest *msg)
-{
- struct GNUNET_HashCode hashcode;
- struct IBF_Key *ibf_key;
- unsigned int num;
-
- /* element requests are allowed in every round */
-
- num = ntohs (msg->header.size) / sizeof (struct IBF_Key);
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "handling element request for %u elements\n", num);
-
- ibf_key = (struct IBF_Key *) &msg[1];
- while (num--)
- {
- struct ElementList *head;
- ibf_hashcode_from_key (*ibf_key, &hashcode);
- head = GNUNET_CONTAINER_multihashmap_get (cpi->session->values, &hashcode);
- send_elements (cpi, head);
- ibf_key++;
- }
- return GNUNET_YES;
-}
-
-/**
- * If necessary, send a message to the peer, depending on the current
- * round.
- */
-static void
-embrace_peer (struct ConsensusPeerInformation *cpi)
-{
- GNUNET_assert (GNUNET_YES == cpi->hello);
- switch (cpi->session->current_round)
- {
- case CONSENSUS_ROUND_EXCHANGE:
- if (cpi->session->partner_outgoing != cpi)
- break;
- /* fallthrough */
- case CONSENSUS_ROUND_INVENTORY:
- /* fallthrough */
- case CONSENSUS_ROUND_STOCK:
- if (cpi == cpi->session->partner_outgoing)
- send_strata_estimator (cpi);
- default:
- break;
- }
-}
-
-
-/**
- * Handle a HELLO-message, send when another peer wants to join a session where
- * our peer is a member. The session may or may not be inhabited yet.
- */
-static int
-handle_p2p_hello (struct IncomingSocket *inc, const struct ConsensusHello *hello)
-{
- /* FIXME: session might not exist yet. create an uninhabited session and wait for a client */
- struct ConsensusSession *session;
-
- session = sessions_head;
- while (NULL != session)
- {
- if (0 == GNUNET_CRYPTO_hash_cmp (&session->global_id, &hello->global_id))
- {
- int idx;
- idx = get_peer_idx (&inc->peer_id, session);
- GNUNET_assert (-1 != idx);
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "peer %d hello'ed session %d\n", idx);
- inc->cpi = &session->info[idx];
- inc->cpi->mst = inc->mst;
- inc->cpi->hello = GNUNET_YES;
- inc->cpi->socket = inc->socket;
- embrace_peer (inc->cpi);
- return GNUNET_YES;
- }
- session = session->next;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "peer tried to HELLO uninhabited session\n");
- return GNUNET_NO;
-}
-
-
-/**
- * Send a strata estimator.
- *
- * @param cpi the peer
- */
-static void
-send_strata_estimator (struct ConsensusPeerInformation *cpi)
-{
- struct StrataMessage *strata_msg;
- void *buf;
- size_t msize;
- int i;
-
- cpi->apparent_round = cpi->session->current_round;
- cpi->ibf_state = IBF_STATE_NONE;
- cpi->ibf_bucket_counter = 0;
-
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%d: sending SE(%d) to P%d\n",
- cpi->session->local_peer_idx, cpi->session->current_round, (int) (cpi - cpi->session->info));
-
- msize = (sizeof *strata_msg) + (STRATA_COUNT * IBF_BUCKET_SIZE * STRATA_IBF_BUCKETS);
-
- strata_msg = GNUNET_malloc (msize);
- strata_msg->header.size = htons (msize);
- strata_msg->header.type = htons (GNUNET_MESSAGE_TYPE_CONSENSUS_P2P_DELTA_ESTIMATE);
- strata_msg->round = cpi->session->current_round;
- strata_msg->exp_round = cpi->session->exp_round;
- strata_msg->exp_subround = cpi->session->exp_subround;
-
- buf = &strata_msg[1];
- for (i = 0; i < STRATA_COUNT; i++)
- {
- ibf_write (cpi->session->se->strata[i], &buf, NULL);
- }
-
- queue_peer_message (cpi, (struct GNUNET_MessageHeader *) strata_msg);
-}
-
-
-/**
- * Send an IBF of the order specified in cpi.
- *
- * @param cpi the peer
- */
-static void
-send_ibf (struct ConsensusPeerInformation *cpi)
-{
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%d: sending IBF to P%d\n",
- cpi->session->local_peer_idx, (int) (cpi - cpi->session->info));
-
- cpi->ibf_bucket_counter = 0;
- while (cpi->ibf_bucket_counter < (1 << cpi->ibf_order))
- {
- int num_buckets;
- void *buf;
- struct DifferenceDigest *digest;
- int msize;
-
- num_buckets = (1 << cpi->ibf_order) - cpi->ibf_bucket_counter;
- /* limit to maximum */
- if (num_buckets > BUCKETS_PER_MESSAGE)
- num_buckets = BUCKETS_PER_MESSAGE;
-
- msize = (sizeof *digest) + (num_buckets * IBF_BUCKET_SIZE);
-
- digest = GNUNET_malloc (msize);
- digest->header.size = htons (msize);
- digest->header.type = htons (GNUNET_MESSAGE_TYPE_CONSENSUS_P2P_DIFFERENCE_DIGEST);
- digest->order = cpi->ibf_order;
- digest->round = cpi->apparent_round;
-
- buf = &digest[1];
- ibf_write_slice (cpi->ibf, cpi->ibf_bucket_counter, num_buckets, &buf, NULL);
-
- queue_peer_message (cpi, (struct GNUNET_MessageHeader *) digest);
-
- cpi->ibf_bucket_counter += num_buckets;
- }
- cpi->ibf_bucket_counter = 0;
- cpi->ibf_state = IBF_STATE_ANTICIPATE_DIFF;
-}
-
-
-/**
- * Decode the current diff ibf, and send elements/requests/reports/
- *
- * @param cpi partner peer
- */
-static void
-decode (struct ConsensusPeerInformation *cpi)
-{
- struct IBF_Key key;
- struct GNUNET_HashCode hashcode;
- int side;
-
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%d: decoding ibf from P%d\n", cpi->session->local_peer_idx, (int) (cpi - cpi->session->info));
-
- for (;;)
- {
- int res;
-
- res = ibf_decode (cpi->ibf, &side, &key);
- if (GNUNET_SYSERR == res)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "decoding failed, transmitting larger IBF\n");
- /* decoding failed, we tell the other peer by sending our ibf with a larger order */
- cpi->ibf_order++;
- prepare_ibf (cpi);
- cpi->ibf = ibf_dup (cpi->session->ibfs[cpi->ibf_order]);
- cpi->ibf_state = IBF_STATE_TRANSMITTING;
- cpi->ibf_bucket_counter = 0;
- send_ibf (cpi);
- return;
- }
- if (GNUNET_NO == res)
- {
- struct ConsensusRoundMessage *msg;
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%d: transmitted all values, sending SYNC\n", cpi->session->local_peer_idx);
- msg = GNUNET_malloc (sizeof *msg);
- msg->header.size = htons (sizeof *msg);
- msg->header.type = htons (GNUNET_MESSAGE_TYPE_CONSENSUS_P2P_SYNCED);
- msg->round = cpi->apparent_round;
- queue_peer_message (cpi, (struct GNUNET_MessageHeader *) msg);
- return;
- }
- if (-1 == side)
- {
- struct ElementList *head;
- /* we have the element(s), send it to the other peer */
- ibf_hashcode_from_key (key, &hashcode);
- head = GNUNET_CONTAINER_multihashmap_get (cpi->session->values, &hashcode);
- send_elements (cpi, head);
- }
- else
- {
- struct ElementRequest *msg;
- size_t msize;
- struct IBF_Key *p;
-
- msize = (sizeof *msg) + sizeof (struct IBF_Key);
- msg = GNUNET_malloc (msize);
- switch (cpi->apparent_round)
- {
- case CONSENSUS_ROUND_STOCK:
- /* FIXME: check if we really want to request the element */
- case CONSENSUS_ROUND_EXCHANGE:
- msg->header.type = htons (GNUNET_MESSAGE_TYPE_CONSENSUS_P2P_ELEMENTS_REQUEST);
- break;
- case CONSENSUS_ROUND_INVENTORY:
- msg->header.type = htons (GNUNET_MESSAGE_TYPE_CONSENSUS_P2P_ELEMENTS_REPORT);
- break;
- default:
- GNUNET_assert (0);
- }
- msg->header.size = htons (msize);
- p = (struct IBF_Key *) &msg[1];
- *p = key;
- queue_peer_message (cpi, (struct GNUNET_MessageHeader *) msg);
- }
- }
-}
-
-
-/**
- * Functions with this signature are called whenever a
- * complete message is received by the tokenizer.
- *
- * Do not call GNUNET_SERVER_mst_destroy in callback
- *
- * @param cls closure
- * @param client identification of the client
- * @param message the actual message
- * @return GNUNET_OK on success, GNUNET_SYSERR to stop further processing
- */
-static int
-mst_session_callback (void *cls, void *client, const struct GNUNET_MessageHeader *message)
-{
- struct ConsensusPeerInformation *cpi;
- cpi = cls;
- switch (ntohs (message->type))
- {
- case GNUNET_MESSAGE_TYPE_CONSENSUS_P2P_DELTA_ESTIMATE:
- return handle_p2p_strata (cpi, (struct StrataMessage *) message);
- case GNUNET_MESSAGE_TYPE_CONSENSUS_P2P_DIFFERENCE_DIGEST:
- return handle_p2p_ibf (cpi, (struct DifferenceDigest *) message);
- case GNUNET_MESSAGE_TYPE_CONSENSUS_P2P_ELEMENTS:
- return handle_p2p_element (cpi, message);
- case GNUNET_MESSAGE_TYPE_CONSENSUS_P2P_ELEMENTS_REPORT:
- return handle_p2p_element_report (cpi, message);
- case GNUNET_MESSAGE_TYPE_CONSENSUS_P2P_ELEMENTS_REQUEST:
- return handle_p2p_element_request (cpi, (struct ElementRequest *) message);
- case GNUNET_MESSAGE_TYPE_CONSENSUS_P2P_SYNCED:
- return handle_p2p_synced (cpi, message);
- case GNUNET_MESSAGE_TYPE_CONSENSUS_P2P_FIN:
- return handle_p2p_fin (cpi, message);
- default:
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "ignoring unexpected message type (%u) from peer: %s\n",
- ntohs (message->type), GNUNET_h2s (&cpi->peer_id.hashPubKey));
- }
- return GNUNET_OK;
-}
-
-
-/**
- * Handle tokenized messages from stream sockets.
- * Delegate them if the socket belongs to a session,
- * handle hello messages otherwise.
- *
- * Do not call GNUNET_SERVER_mst_destroy in callback
- *
- * @param cls closure, unused
- * @param client incoming socket this message comes from
- * @param message the actual message
- *
- * @return GNUNET_OK on success, GNUNET_SYSERR to stop further processing
- */
-static int
-mst_incoming_callback (void *cls, void *client, const struct GNUNET_MessageHeader *message)
-{
- struct IncomingSocket *inc;
- inc = (struct IncomingSocket *) client;
- switch (ntohs( message->type))
- {
- case GNUNET_MESSAGE_TYPE_CONSENSUS_P2P_HELLO:
- return handle_p2p_hello (inc, (struct ConsensusHello *) message);
- default:
- if (NULL != inc->cpi)
- return mst_session_callback (inc->cpi, client, message);
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "ignoring unexpected message type (%u) from peer: %s (not in session)\n",
- ntohs (message->type), GNUNET_h2s (&inc->peer_id.hashPubKey));
- }
- return GNUNET_OK;
-}
-
-
-/**
- * Functions of this type are called upon new stream connection from other peers
- * or upon binding error which happen when the app_port given in
- * GNUNET_STREAM_listen() is already taken.
- *
- * @param cls the closure from GNUNET_STREAM_listen
- * @param socket the socket representing the stream; NULL on binding error
- * @param initiator the identity of the peer who wants to establish a stream
- * with us; NULL on binding error
- * @return GNUNET_OK to keep the socket open, GNUNET_SYSERR to close the
- * stream (the socket will be invalid after the call)
- */
-static int
-listen_cb (void *cls,
- struct GNUNET_STREAM_Socket *socket,
- const struct GNUNET_PeerIdentity *initiator)
-{
- struct IncomingSocket *incoming;
- GNUNET_assert (NULL != socket);
- incoming = GNUNET_malloc (sizeof *incoming);
- incoming->socket = socket;
- incoming->peer_id = *initiator;
- incoming->rh = GNUNET_STREAM_read (socket, GNUNET_TIME_UNIT_FOREVER_REL,
- &incoming_stream_data_processor, incoming);
- incoming->mst = GNUNET_SERVER_mst_create (mst_incoming_callback, incoming);
- GNUNET_CONTAINER_DLL_insert_tail (incoming_sockets_head, incoming_sockets_tail, incoming);
- return GNUNET_OK;
-}
-
-
-/**
- * Iterator over hash map entries.
- *
- * @param cls closure
- * @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.
- */
-static int
-destroy_element_list_iter (void *cls,
- const struct GNUNET_HashCode * key,
- void *value)
-{
- struct ElementList *el;
- el = value;
- while (NULL != el)
- {
- struct ElementList *el_old;
- el_old = el;
- el = el->next;
- GNUNET_free (el_old->element_hash);
- GNUNET_free (el_old->element);
- GNUNET_free (el_old);
- }
- return GNUNET_YES;
-}
-
-
-/**
- * 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);
- GNUNET_SERVER_client_drop (session->client);
- session->client = NULL;
- if (NULL != session->shuffle)
- {
- GNUNET_free (session->shuffle);
- session->shuffle = NULL;
- }
- if (NULL != session->se)
- {
- strata_estimator_destroy (session->se);
- session->se = NULL;
- }
- if (NULL != session->info)
- {
- for (i = 0; i < session->num_peers; i++)
- {
- struct ConsensusPeerInformation *cpi;
- cpi = &session->info[i];
- if ((NULL != cpi) && (NULL != cpi->socket))
- {
- if (NULL != cpi->rh)
- {
- GNUNET_STREAM_read_cancel (cpi->rh);
- cpi->rh = NULL;
- }
- if (NULL != cpi->wh)
- {
- GNUNET_STREAM_write_cancel (cpi->wh);
- cpi->wh = NULL;
- }
- GNUNET_STREAM_close (cpi->socket);
- cpi->socket = NULL;
- }
- if (NULL != cpi->se)
- {
- strata_estimator_destroy (cpi->se);
- cpi->se = NULL;
- }
- if (NULL != cpi->ibf)
- {
- ibf_destroy (cpi->ibf);
- cpi->ibf = NULL;
- }
- if (NULL != cpi->mst)
- {
- GNUNET_SERVER_mst_destroy (cpi->mst);
- cpi->mst = NULL;
- }
- }
- GNUNET_free (session->info);
- session->info = NULL;
- }
- if (NULL != session->ibfs)
- {
- for (i = 0; i <= MAX_IBF_ORDER; i++)
- {
- if (NULL != session->ibfs[i])
- {
- ibf_destroy (session->ibfs[i]);
- session->ibfs[i] = NULL;
- }
- }
- GNUNET_free (session->ibfs);
- session->ibfs = NULL;
- }
- if (NULL != session->values)
- {
- GNUNET_CONTAINER_multihashmap_iterate (session->values, destroy_element_list_iter, NULL);
- GNUNET_CONTAINER_multihashmap_destroy (session->values);
- session->values = NULL;
- }
- GNUNET_free (session);
-}
-
-
-/**
- * Disconnect a client, and destroy all sessions associated with it.
- *
- * @param client the client to disconnect
- */
-static void
-disconnect_client (struct GNUNET_SERVER_Client *client)
-{
- struct ConsensusSession *session;
- GNUNET_SERVER_client_disconnect (client);
-
- /* if the client owns a session, remove it */
- session = sessions_head;
- while (NULL != session)
- {
- if (client == session->client)
- {
- destroy_session (session);
- break;
- }
- session = session->next;
- }
-}
-
-
-/**
- * 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;
-
- session->global_id = *session_id;
- for (i = 0; i < session->num_peers; ++i)
- {
- GNUNET_CRYPTO_hash_xor (&session->global_id, &session->info[i].peer_id.hashPubKey, &tmp);
- session->global_id = tmp;
- GNUNET_CRYPTO_hash (&session->global_id, sizeof (struct GNUNET_PeerIdentity), &tmp);
- session->global_id = tmp;
- }
-}
-
-
-/**
- * Transmit a queued message to the session's client.
- *
- * @param cls consensus session
- * @param size number of bytes available in buf
- * @param buf where the callee should write the message
- * @return number of bytes written to buf
- */
-static size_t
-transmit_queued (void *cls, size_t size,
- void *buf)
-{
- struct ConsensusSession *session;
- struct QueuedMessage *qmsg;
- size_t msg_size;
-
- session = cls;
- session->client_th = NULL;
-
- qmsg = session->client_messages_head;
- GNUNET_CONTAINER_DLL_remove (session->client_messages_head, session->client_messages_tail, qmsg);
- GNUNET_assert (qmsg);
-
- if (NULL == buf)
- {
- destroy_session (session);
- return 0;
- }
-
- msg_size = ntohs (qmsg->msg->size);
-
- GNUNET_assert (size >= msg_size);
-
- memcpy (buf, qmsg->msg, msg_size);
- GNUNET_free (qmsg->msg);
- GNUNET_free (qmsg);
-
- client_send_next (session);
-
- return msg_size;
-}
-
-
-/**
- * Schedule transmitting the next queued message (if any) to the inhabiting client of a session.
- *
- * @param session the consensus session
- */
-static void
-client_send_next (struct ConsensusSession *session)
-{
-
- GNUNET_assert (NULL != session);
-
- if (NULL != session->client_th)
- return;
-
- if (NULL != session->client_messages_head)
- {
- int msize;
- msize = ntohs (session->client_messages_head->msg->size);
- session->client_th = GNUNET_SERVER_notify_transmit_ready (session->client, msize,
- GNUNET_TIME_UNIT_FOREVER_REL,
- &transmit_queued, session);
- }
-}
-
-
-/**
- * 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);
-}
-
-
-/**
- * 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 int
-get_peer_idx (const struct GNUNET_PeerIdentity *peer, const struct ConsensusSession *session)
-{
- 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;
-}
-
-
-/**
- * Called when stream has finishes writing the hello message
- */
-static void
-hello_cont (void *cls, enum GNUNET_STREAM_Status status, size_t size)
-{
- struct ConsensusPeerInformation *cpi;
-
- cpi = cls;
- cpi->wh = NULL;
- cpi->hello = GNUNET_YES;
- GNUNET_assert (GNUNET_STREAM_OK == status);
- embrace_peer (cpi);
-}
-
-
-/**
- * Called when we established a stream connection to another peer
- *
- * @param cls cpi of the peer we just connected to
- * @param socket socket to use to communicate with the other side (read/write)
- */
-static void
-open_cb (void *cls, struct GNUNET_STREAM_Socket *socket)
-{
- struct ConsensusPeerInformation *cpi;
- struct ConsensusHello *hello;
-
- cpi = cls;
- hello = GNUNET_malloc (sizeof *hello);
- hello->header.size = htons (sizeof *hello);
- hello->header.type = htons (GNUNET_MESSAGE_TYPE_CONSENSUS_P2P_HELLO);
- memcpy (&hello->global_id, &cpi->session->global_id, sizeof (struct GNUNET_HashCode));
- GNUNET_assert (NULL == cpi->mst);
- cpi->mst = GNUNET_SERVER_mst_create (mst_session_callback, cpi);
- cpi->wh =
- GNUNET_STREAM_write (socket, hello, sizeof *hello, GNUNET_TIME_UNIT_FOREVER_REL, hello_cont, cpi);
- GNUNET_free (hello);
- cpi->rh = GNUNET_STREAM_read (socket, GNUNET_TIME_UNIT_FOREVER_REL,
- &session_stream_data_processor, cpi);
-}
-
-
-/**
- * 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)
-{
- unsigned int local_peer_in_list;
- uint32_t listed_peers;
- const struct GNUNET_PeerIdentity *msg_peers;
- struct GNUNET_PeerIdentity *peers;
- unsigned int i;
-
- GNUNET_assert (NULL != session->join_msg);
-
- /* peers in the join message, may or may not include the local peer */
- listed_peers = ntohl (session->join_msg->num_peers);
-
- session->num_peers = listed_peers;
-
- msg_peers = (struct GNUNET_PeerIdentity *) &session->join_msg[1];
-
- local_peer_in_list = GNUNET_NO;
- for (i = 0; i < listed_peers; i++)
- {
- if (0 == memcmp (&msg_peers[i], my_peer, sizeof (struct GNUNET_PeerIdentity)))
- {
- local_peer_in_list = GNUNET_YES;
- break;
- }
- }
-
- if (GNUNET_NO == local_peer_in_list)
- session->num_peers++;
-
- peers = GNUNET_malloc (session->num_peers * sizeof (struct GNUNET_PeerIdentity));
-
- if (GNUNET_NO == local_peer_in_list)
- peers[session->num_peers - 1] = *my_peer;
-
- 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];
- }
-
- free (peers);
-}
-
-
-static void
-strata_estimator_insert (struct StrataEstimator *se, struct GNUNET_HashCode *key)
-{
- uint32_t v;
- int i;
- v = key->bits[0];
- /* count trailing '1'-bits of v */
- for (i = 0; v & 1; v>>=1, i++)
- /* empty */;
- ibf_insert (se->strata[i], ibf_key_from_hashcode (key));
-}
-
-
-/**
- * Add incoming peer connections to the session,
- * for peers who have connected to us before the local session has been established
- *
- * @param session ...
- */
-static void
-add_incoming_peers (struct ConsensusSession *session)
-{
- struct IncomingSocket *inc;
- inc = incoming_sockets_head;
-
- while (NULL != inc)
- {
- if (0 == GNUNET_CRYPTO_hash_cmp (&session->global_id, inc->requested_gid))
- {
- int i;
- for (i = 0; i < session->num_peers; i++)
- {
- struct ConsensusPeerInformation *cpi;
- cpi = &session->info[i];
- if (0 == memcmp (&inc->peer_id, &cpi->peer_id, sizeof (struct GNUNET_PeerIdentity)))
- {
- cpi->socket = inc->socket;
- inc->cpi = cpi;
- inc->cpi->mst = inc->mst;
- inc->cpi->hello = GNUNET_YES;
- break;
- }
- }
- }
- inc = inc->next;
- }
-}
-
-
-/**
- * Initialize the session, continue receiving messages from the owning client
- *
- * @param session the session to initialize
- */
-static void
-initialize_session (struct ConsensusSession *session)
-{
- const struct ConsensusSession *other_session;
-
- GNUNET_assert (NULL != session->join_msg);
- initialize_session_peer_list (session);
- session->current_round = CONSENSUS_ROUND_BEGIN;
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "session with %u peers\n", session->num_peers);
- compute_global_id (session, &session->join_msg->session_id);
-
- /* Check if some local client already owns the session. */
- other_session = sessions_head;
- while (NULL != other_session)
- {
- if ((other_session != session) &&
- (0 == GNUNET_CRYPTO_hash_cmp (&session->global_id, &other_session->global_id)))
- {
- /* session already owned by another client */
- GNUNET_break (0);
- disconnect_client (session->client);
- return;
- }
- other_session = other_session->next;
- }
-
- session->values = GNUNET_CONTAINER_multihashmap_create (256, GNUNET_NO);
- session->local_peer_idx = get_peer_idx (my_peer, session);
- GNUNET_assert (-1 != session->local_peer_idx);
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "%d is the local peer\n", session->local_peer_idx);
- session->se = strata_estimator_create ();
- session->ibfs = GNUNET_malloc ((MAX_IBF_ORDER+1) * sizeof (struct InvertibleBloomFilter *));
- GNUNET_free (session->join_msg);
- session->join_msg = NULL;
- add_incoming_peers (session);
- GNUNET_SERVER_receive_done (session->client, GNUNET_OK);
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "session %s initialized\n", GNUNET_h2s (&session->global_id));
-}
-
-
-/**
- * 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;
-
- // make sure the client has not already joined a session
- session = sessions_head;
- while (NULL != session)
- {
- if (session->client == client)
- {
- GNUNET_break (0);
- disconnect_client (client);
- return;
- }
- session = session->next;
- }
-
- session = GNUNET_malloc (sizeof (struct ConsensusSession));
- session->join_msg = (struct GNUNET_CONSENSUS_JoinMessage *) GNUNET_copy_message (m);
- session->client = client;
- GNUNET_SERVER_client_keep (client);
-
- GNUNET_CONTAINER_DLL_insert (sessions_head, sessions_tail, session);
-
- // Initialize session later if local peer identity is not known yet.
- if (NULL == my_peer)
- {
- GNUNET_SERVER_disable_receive_done_warning (client);
+ /* don't kick off next round if we're shutting down */
+ if ((NULL != tc) && (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
return;
- }
-
- initialize_session (session);
-}
-
-
-/**
- * Hash a block of data, producing a replicated ibf hash.
- */
-static void
-hash_for_ibf (const void *block, size_t size, struct GNUNET_HashCode *ret)
-{
- struct IBF_Key ibf_key;
- GNUNET_CRYPTO_hash (block, size, ret);
- ibf_key = ibf_key_from_hashcode (ret);
- ibf_hashcode_from_key (ibf_key, ret);
-}
+ session = cls;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "P%d: round over\n", session->local_peer_idx);
-static void
-insert_element (struct ConsensusSession *session, struct GNUNET_CONSENSUS_Element *element)
-{
- struct GNUNET_HashCode hash;
- struct ElementList *head;
-
- hash_for_ibf (element->data, element->size, &hash);
-
- head = GNUNET_CONTAINER_multihashmap_get (session->values, &hash);
-
- if (NULL == head)
+ if (session->round_timeout_tid != GNUNET_SCHEDULER_NO_TASK)
{
- int i;
-
- head = GNUNET_malloc (sizeof *head);
- head->element = element;
- head->next = NULL;
- head->element_hash = GNUNET_memdup (&hash, sizeof hash);
- GNUNET_CONTAINER_multihashmap_put (session->values, &hash, head,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
- strata_estimator_insert (session->se, &hash);
-
- for (i = 0; i <= MAX_IBF_ORDER; i++)
- if (NULL != session->ibfs[i])
- ibf_insert (session->ibfs[i], ibf_key_from_hashcode (&hash));
+ GNUNET_SCHEDULER_cancel (session->round_timeout_tid);
+ session->round_timeout_tid = GNUNET_SCHEDULER_NO_TASK;
}
- else
+
+ switch (session->current_round)
{
- struct ElementList *el;
- el = GNUNET_malloc (sizeof *el);
- head->element = element;
- head->next = NULL;
- head->element_hash = GNUNET_memdup (&hash, sizeof hash);
- while (NULL != head->next)
- head = head->next;
- head->next = el;
+ 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);
}
}
/**
- * Called when a client performs an insert operation.
+ * 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 cls (unused)
- * @param client client handle
- * @param m message sent by the client
+ * @param session the session to create the new permutation for
*/
-void
-client_insert (void *cls,
- struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *m)
+static void
+shuffle (struct ConsensusSession *session)
{
- struct ConsensusSession *session;
- struct GNUNET_CONSENSUS_ElementMessage *msg;
- struct GNUNET_CONSENSUS_Element *element;
- int element_size;
-
- session = sessions_head;
- while (NULL != session)
- {
- if (session->client == client)
- break;
- }
-
- if (NULL == session)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "client tried to insert, but client is not in any session\n");
- GNUNET_SERVER_client_disconnect (client);
- return;
- }
-
- msg = (struct GNUNET_CONSENSUS_ElementMessage *) m;
- element_size = ntohs (msg->header.size )- sizeof (struct GNUNET_CONSENSUS_ElementMessage);
+ uint32_t i;
+ uint32_t randomness[session->num_peers-1];
- element = GNUNET_malloc (sizeof (struct GNUNET_CONSENSUS_Element) + element_size);
+ 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));
- element->type = msg->element_type;
- element->size = element_size;
- memcpy (&element[1], &msg[1], element_size);
- element->data = &element[1];
-
- GNUNET_assert (NULL != element->data);
-
- insert_element (session, element);
-
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
+ GNUNET_CRYPTO_kdf (randomness, sizeof (randomness),
+ &session->exp_round, sizeof (uint32_t),
+ &session->global_id, sizeof (struct GNUNET_HashCode),
+ NULL);
- client_send_next (session);
-}
-
-
-
-/**
- * Functions of this signature are called whenever writing operations
- * on a stream are executed
- *
- * @param cls the closure from GNUNET_STREAM_write
- * @param status the status of the stream at the time this function is called;
- * GNUNET_STREAM_OK if writing to stream was completed successfully;
- * GNUNET_STREAM_TIMEOUT if the given data is not sent successfully
- * (this doesn't mean that the data is never sent, the receiver may
- * have read the data but its ACKs may have been lost);
- * GNUNET_STREAM_SHUTDOWN if the stream is shutdown for writing in the
- * mean time; GNUNET_STREAM_SYSERR if the stream is broken and cannot
- * be processed.
- * @param size the number of bytes written
- */
-static void
-write_queued (void *cls, enum GNUNET_STREAM_Status status, size_t size)
-{
- struct ConsensusPeerInformation *cpi;
+ for (i = 0; i < session->num_peers; i++)
+ session->shuffle[i] = i;
- GNUNET_assert (GNUNET_STREAM_OK == status);
- cpi = cls;
- cpi->wh = NULL;
- if (NULL != cpi->messages_head)
+ for (i = session->num_peers - 1; i > 0; i--)
{
- struct QueuedMessage *qm;
- qm = cpi->messages_head;
- GNUNET_CONTAINER_DLL_remove (cpi->messages_head, cpi->messages_tail, qm);
- cpi->wh = GNUNET_STREAM_write (cpi->socket, qm->msg, ntohs (qm->msg->size),
- GNUNET_TIME_UNIT_FOREVER_REL,
- write_queued, cpi);
- if (NULL != qm->cb)
- qm->cb (qm->cls);
- GNUNET_free (qm->msg);
- GNUNET_free (qm);
- GNUNET_assert (NULL != cpi->wh);
+ 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;
}
-}
-
-static void
-shuffle (struct ConsensusSession *session)
-{
- /* FIXME: implement */
+ /* create the inverse */
+ for (i = 0; i < session->num_peers; i++)
+ session->shuffle_inv[session->shuffle[i]] = i;
}
/**
* Find and set the partner_incoming and partner_outgoing of our peer,
- * one of them may not exist in most cases.
+ * 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)
{
- int mark[session->num_peers];
- int i;
- memset (mark, 0, session->num_peers * sizeof (int));
- session->partner_incoming = session->partner_outgoing = NULL;
- for (i = 0; i < session->num_peers; i++)
- {
- int arc;
- if (0 != mark[i])
- continue;
- arc = (i + (1 << session->exp_subround)) % session->num_peers;
- mark[i] = mark[arc] = 1;
- GNUNET_assert (i != arc);
- if (i == session->local_peer_idx)
- {
- GNUNET_assert (NULL == session->partner_outgoing);
- session->partner_outgoing = &session->info[session->shuffle[arc]];
- session->partner_outgoing->exp_subround_finished = GNUNET_NO;
- }
- if (arc == session->local_peer_idx)
+ 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)
{
- GNUNET_assert (NULL == session->partner_incoming);
- session->partner_incoming = &session->info[session->shuffle[i]];
- session->partner_incoming->exp_subround_finished = GNUNET_NO;
+ 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;
}
+/**
+ * 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
-replay_premature_message (struct ConsensusPeerInformation *cpi)
+set_result_cb (void *cls,
+ const struct GNUNET_SET_Element *element,
+ enum GNUNET_SET_Status status)
{
- if (NULL != cpi->premature_strata_message)
+ 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)
{
- struct StrataMessage *sm;
+ 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;
+ }
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "replaying premature SE\n");
- sm = cpi->premature_strata_message;
- cpi->premature_strata_message = NULL;
+ 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;
+ }
+}
- cpi->replaying_strata_message = GNUNET_YES;
- handle_p2p_strata (cpi, sm);
- cpi->replaying_strata_message = GNUNET_NO;
- GNUNET_free (sm);
+/**
+ * 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);
}
if ((NULL != tc) && (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
return;
session = cls;
- /* don't send any messages from the last round */
- /*
- clear_peer_messages (session->partner_outgoing);
- clear_peer_messages (session->partner_incoming);
- for (i = 0; i < session->num_peers; i++)
- clear_peer_messages (&session->info[i]);
- */
/* cancel timeout */
- if ((NULL == tc) && (session->round_timeout_tid != GNUNET_SCHEDULER_NO_TASK))
+ if (session->round_timeout_tid != GNUNET_SCHEDULER_NO_TASK)
+ {
GNUNET_SCHEDULER_cancel (session->round_timeout_tid);
- session->round_timeout_tid = GNUNET_SCHEDULER_NO_TASK;
- /* check if we are done with the log phase, 2-peer consensus only does one log round */
- if ( (session->exp_round == NUM_EXP_ROUNDS) ||
- ((session->num_peers == 2) && (session->exp_round == 1)))
+ session->round_timeout_tid = GNUNET_SCHEDULER_NO_TASK;
+ }
+
+ if (session->exp_round >= NUM_EXP_ROUNDS)
{
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%d: exp-round over\n", session->local_peer_idx);
round_over (session, NULL);
return;
}
+
if (session->exp_round == 0)
{
/* initialize everything for the log-rounds */
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] = i;
+ session->shuffle[i] = session->shuffle_inv[i] = i;
}
else if (session->exp_subround + 1 >= (int) ceil (log2 (session->num_peers)))
{
session->exp_subround = 0;
shuffle (session);
}
- else
+ 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;
in = -1;
else
in = (int) (session->partner_incoming - session->info);
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%u: doing exp-round, r=%d, sub=%d, in: %d, out: %d\n", session->local_peer_idx,
+ 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 */
- if (NULL != session->partner_incoming)
+}
+
+
+/**
+ * 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 int
+get_peer_idx (const struct GNUNET_PeerIdentity *peer, const struct ConsensusSession *session)
+{
+ 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;
+}
+
+
+/**
+ * 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;
+
+ /* FIXME: use kdf? */
+
+ session->global_id = *session_id;
+ for (i = 0; i < session->num_peers; ++i)
+ {
+ 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;
+ }
+}
+
+
+/**
+ * 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);
+}
+
+
+/**
+ * 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;
+
+ 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++)
{
- session->partner_incoming->ibf_state = IBF_STATE_NONE;
- session->partner_incoming->exp_subround_finished = GNUNET_NO;
- session->partner_incoming->ibf_bucket_counter = 0;
+ if (0 == memcmp (&msg_peers[i], &my_peer, sizeof (struct GNUNET_PeerIdentity)))
+ {
+ local_peer_in_list = GNUNET_YES;
+ break;
+ }
+ }
+
+ if (GNUNET_NO == local_peer_in_list)
+ session->num_peers++;
+
+ peers = GNUNET_malloc (session->num_peers * sizeof (struct GNUNET_PeerIdentity));
+
+ if (GNUNET_NO == local_peer_in_list)
+ peers[session->num_peers - 1] = my_peer;
+
+ memcpy (peers, msg_peers, listed_peers * sizeof (struct GNUNET_PeerIdentity));
+ qsort (peers, session->num_peers, sizeof (struct GNUNET_PeerIdentity), &hash_cmp);
- /* maybe there's an early strata estimator? */
- replay_premature_message (session->partner_incoming);
- }
+ session->info = GNUNET_malloc (session->num_peers * sizeof (struct ConsensusPeerInformation));
- if (NULL != session->partner_outgoing)
+ for (i = 0; i < session->num_peers; ++i)
{
- session->partner_outgoing->ibf_state = IBF_STATE_NONE;
- session->partner_outgoing->ibf_bucket_counter = 0;
- session->partner_outgoing->exp_subround_finished = GNUNET_NO;
-
- if (NULL == session->partner_outgoing->socket)
- {
- session->partner_outgoing->socket =
- GNUNET_STREAM_open (cfg, &session->partner_outgoing->peer_id, GNUNET_APPLICATION_TYPE_CONSENSUS,
- open_cb, session->partner_outgoing,
- GNUNET_STREAM_OPTION_END);
- }
- else if (GNUNET_YES == session->partner_outgoing->hello)
- {
- send_strata_estimator (session->partner_outgoing);
- }
- /* else: do nothing, the send hello cb will handle this */
+ /* initialize back-references, so consensus peer information can
+ * be used as closure */
+ session->info[i].session = session;
+ session->info[i].peer_id = peers[i];
}
- /*
- session->round_timeout_tid = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (session->conclude_timeout, 3 * NUM_EXP_ROUNDS),
- subround_over, session);
- */
+ GNUNET_free (peers);
}
+
+/**
+ * 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.
+ */
static void
-contact_peer_a2a (struct ConsensusPeerInformation *cpi)
+set_listen_cb (void *cls,
+ const struct GNUNET_PeerIdentity *other_peer,
+ const struct GNUNET_MessageHeader *context_msg,
+ struct GNUNET_SET_Request *request)
{
- cpi->is_outgoing = GNUNET_YES;
- if (NULL == cpi->socket)
+ 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;
+ }
+
+ index = get_peer_idx (other_peer, session);
+
+ if (index < 0)
{
- cpi->socket = GNUNET_STREAM_open (cfg, &cpi->peer_id, GNUNET_APPLICATION_TYPE_CONSENSUS,
- open_cb, cpi, GNUNET_STREAM_OPTION_END);
+ GNUNET_break_op (0);
+ return;
}
- else if (GNUNET_YES == cpi->hello)
+
+ round_info.round = ntohl (msg->round);
+ round_info.exp_round = ntohl (msg->exp_round);
+ round_info.exp_subround = ntohl (msg->exp_subround);
+
+ cpi = &session->info[index];
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "P%d got set request from P%d\n", session->local_peer_idx, index);
+
+ switch (session->current_round)
{
- send_strata_estimator (cpi);
+ 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;
}
}
+
/**
- * Start the inventory round, contact all peers we are supposed to contact.
+ * Initialize the session, continue receiving messages from the owning client
*
- * @param session the current session
+ * @param session the session to initialize
+ * @param join_msg the join message from the client
*/
static void
-start_inventory (struct ConsensusSession *session)
+initialize_session (struct ConsensusSession *session,
+ struct GNUNET_CONSENSUS_JoinMessage *join_msg)
{
- int i;
- int last;
+ struct ConsensusSession *other_session;
- for (i = 0; i < session->num_peers; i++)
- {
- session->info[i].ibf_bucket_counter = 0;
- session->info[i].ibf_state = IBF_STATE_NONE;
- session->info[i].is_outgoing = GNUNET_NO;
- }
+ 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);
- last = (session->local_peer_idx + ((session->num_peers - 1) / 2) + 1) % session->num_peers;
- i = (session->local_peer_idx + 1) % session->num_peers;
- while (i != last)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%d contacting P%d in all-to-all\n", session->local_peer_idx, i);
- contact_peer_a2a (&session->info[i]);
- session->info[i].is_outgoing = GNUNET_YES;
- i = (i + 1) % session->num_peers;
- }
- // tie-breaker for even number of peers
- if (((session->num_peers % 2) == 0) && (session->local_peer_idx < last))
+ /* 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)
{
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%d contacting P%d in all-to-all (tie-breaker)\n", session->local_peer_idx, i);
- session->info[last].is_outgoing = GNUNET_YES;
- contact_peer_a2a (&session->info[last]);
+ if ((other_session != session) &&
+ (0 == GNUNET_CRYPTO_hash_cmp (&session->global_id, &other_session->global_id)))
+ {
+ if (CONSENSUS_ROUND_FINISH != other_session->current_round)
+ {
+ GNUNET_break (0);
+ destroy_session (session);
+ return;
+ }
+ break;
+ }
+ other_session = other_session->next;
}
- for (i = 0; i < session->num_peers; i++)
- {
- if (GNUNET_NO == session->info[i].is_outgoing)
- replay_premature_message (&session->info[i]);
- }
+ session->conclude_deadline = GNUNET_TIME_absolute_ntoh (join_msg->deadline);
+ session->conclude_start = GNUNET_TIME_absolute_ntoh (join_msg->start);
+
+ 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 void
-send_client_conclude_done (struct ConsensusSession *session)
+
+static struct ConsensusSession *
+get_session_by_client (struct GNUNET_SERVER_Client *client)
{
- struct GNUNET_MessageHeader *msg;
- session->current_round = CONSENSUS_ROUND_FINISH;
- msg = GNUNET_malloc (sizeof *msg);
- msg->type = htons (GNUNET_MESSAGE_TYPE_CONSENSUS_CLIENT_CONCLUDE_DONE);
- msg->size = htons (sizeof *msg);
- queue_client_message (session, msg);
- client_send_next (session);
+ struct ConsensusSession *session;
+
+ session = sessions_head;
+ while (NULL != session)
+ {
+ if (session->client == client)
+ return session;
+ session = session->next;
+ }
+ return NULL;
}
+
/**
- * Start the next round.
- * This function can be invoked as a timeout task, or called manually (tc will be NULL then).
+ * Called when a client wants to join a consensus session.
*
- * @param cls the session
- * @param tc task context, for when this task is invoked by the scheduler,
- * NULL if invoked for another reason
+ * @param cls unused
+ * @param client client that sent the message
+ * @param m message sent by the client
*/
-static void
-round_over (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+static void
+client_join (void *cls,
+ struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *m)
{
struct ConsensusSession *session;
- /* don't kick off next round if we're shutting down */
- if ((NULL != tc) && (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
- return;
-
- session = cls;
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%d: round over\n", session->local_peer_idx);
-
- /*
- for (i = 0; i < session->num_peers; i++)
- clear_peer_messages (&session->info[i]);
- */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "join message sent by client\n");
- if ((NULL == tc) && (session->round_timeout_tid != GNUNET_SCHEDULER_NO_TASK))
+ session = get_session_by_client (client);
+ if (NULL != session)
{
- GNUNET_SCHEDULER_cancel (session->round_timeout_tid);
- session->round_timeout_tid = GNUNET_SCHEDULER_NO_TASK;
+ 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);
- 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:
- /* handle two peers specially */
- if (session->num_peers <= 2)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "P%d: done\n", session->local_peer_idx);
- send_client_conclude_done (session);
- return;
- }
- session->current_round = CONSENSUS_ROUND_INVENTORY;
- start_inventory (session);
- break;
- case CONSENSUS_ROUND_INVENTORY:
- session->current_round = CONSENSUS_ROUND_STOCK;
- session->exp_round = 0;
- subround_over (session, NULL);
- break;
- case CONSENSUS_ROUND_STOCK:
- session->current_round = CONSENSUS_ROUND_FINISH;
- send_client_conclude_done (session);
- break;
- default:
- GNUNET_assert (0);
- }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "join done\n");
}
/**
- * Called when a client performs the conclude operation.
+ * Called when a client performs an insert operation.
*
* @param cls (unused)
* @param client client handle
- * @param message message sent by the client
+ * @param m message sent by the client
*/
-static void
-client_conclude (void *cls,
- struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
+void
+client_insert (void *cls,
+ struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *m)
{
struct ConsensusSession *session;
- struct GNUNET_CONSENSUS_ConcludeMessage *cmsg;
+ struct GNUNET_CONSENSUS_ElementMessage *msg;
+ struct GNUNET_SET_Element *element;
+ ssize_t element_size;
- cmsg = (struct GNUNET_CONSENSUS_ConcludeMessage *) message;
+ session = get_session_by_client (client);
- session = sessions_head;
- while ((session != NULL) && (session->client != client))
- session = session->next;
if (NULL == session)
{
- /* client not found */
GNUNET_break (0);
GNUNET_SERVER_client_disconnect (client);
return;
if (CONSENSUS_ROUND_BEGIN != session->current_round)
{
- /* client requested conclude twice */
GNUNET_break (0);
- /* client may still own a session, destroy it */
- disconnect_client (client);
+ GNUNET_SERVER_client_disconnect (client);
return;
}
- if (session->num_peers <= 1)
- {
- send_client_conclude_done (session);
- }
- else
+ msg = (struct GNUNET_CONSENSUS_ElementMessage *) m;
+ element_size = ntohs (msg->header.size) - sizeof (struct GNUNET_CONSENSUS_ElementMessage);
+ if (element_size < 0)
{
- session->conclude_timeout = GNUNET_TIME_relative_ntoh (cmsg->timeout);
- /* the 'begin' round is over, start with the next, real round */
- round_over (session, NULL);
+ 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);
- client_send_next (session);
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "P%u: element added\n", session->local_peer_idx);
}
/**
- * Called when a client sends an ack
+ * Called when a client performs the conclude operation.
*
* @param cls (unused)
* @param client client handle
* @param message message sent by the client
*/
-void
-client_ack (void *cls,
- struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
+static void
+client_conclude (void *cls,
+ struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *message)
{
struct ConsensusSession *session;
- struct GNUNET_CONSENSUS_AckMessage *msg;
- struct PendingElement *pending;
- struct GNUNET_CONSENSUS_Element *element;
-
- session = sessions_head;
- while (NULL != session)
- {
- if (session->client == client)
- break;
- }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "conclude requested\n");
+ session = get_session_by_client (client);
if (NULL == session)
{
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "client tried to ack, but client is not in any session\n");
+ /* client not found */
+ GNUNET_break (0);
GNUNET_SERVER_client_disconnect (client);
return;
}
-
- pending = session->client_approval_head;
-
- GNUNET_CONTAINER_DLL_remove (session->client_approval_head, session->client_approval_tail, pending);
-
- msg = (struct GNUNET_CONSENSUS_AckMessage *) message;
-
- if (msg->keep)
+ if (CONSENSUS_ROUND_BEGIN != session->current_round)
{
- element = pending->element;
- insert_element (session, element);
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "got client ack\n");
+ /* client requested conclude twice */
+ GNUNET_break (0);
+ return;
}
-
- GNUNET_free (pending);
-
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
-}
-
-
-/**
- * Task that disconnects from core.
- *
- * @param cls core handle
- * @param tc context information (why was this task triggered now)
- */
-static void
-disconnect_core (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- if (core != NULL)
+ if (session->num_peers <= 1)
{
- GNUNET_CORE_disconnect (core);
- core = NULL;
+ session->current_round = CONSENSUS_ROUND_FINISH;
+ GNUNET_SET_iterate (session->element_set, send_to_client_iter, session);
}
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "disconnected from core\n");
-}
-
-
-static void
-core_startup (void *cls,
- struct GNUNET_CORE_Handle *core,
- const struct GNUNET_PeerIdentity *peer)
-{
- struct ConsensusSession *session;
-
- my_peer = GNUNET_memdup(peer, sizeof (struct GNUNET_PeerIdentity));
- /* core can't be disconnected directly in the core startup callback, schedule a task to do it! */
- GNUNET_SCHEDULER_add_now (&disconnect_core, core);
- GNUNET_log(GNUNET_ERROR_TYPE_INFO, "connected to core\n");
-
- session = sessions_head;
- while (NULL != session)
+ else
{
- if (NULL != session->join_msg)
- initialize_session (session);
- session = session->next;
+ /* 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);
}
shutdown_task (void *cls,
const struct GNUNET_SCHEDULER_TaskContext *tc)
{
- /* FIXME: complete; write separate destructors for different data types */
-
- while (NULL != incoming_sockets_head)
- {
- struct IncomingSocket *socket;
- socket = incoming_sockets_head;
- if (NULL != socket->rh)
- {
- GNUNET_STREAM_read_cancel (socket->rh);
- socket->rh = NULL;
- }
- if (NULL == socket->cpi)
- {
- GNUNET_STREAM_close (socket->socket);
- socket->socket = NULL;
- if (NULL != socket->mst)
- {
- GNUNET_SERVER_mst_destroy (socket->mst);
- socket->mst = NULL;
- }
- }
- incoming_sockets_head = incoming_sockets_head->next;
- GNUNET_free (socket);
- }
-
while (NULL != sessions_head)
- {
- struct ConsensusSession *session;
- session = sessions_head->next;
destroy_session (sessions_head);
- sessions_head = session;
- }
- if (NULL != core)
- {
- GNUNET_CORE_disconnect (core);
- core = NULL;
- }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "handled shutdown request\n");
+}
- if (NULL != listener)
- {
- GNUNET_STREAM_listen_close (listener);
- listener = NULL;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "handled shutdown request\n");
+/**
+ * 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)
+{
+ struct ConsensusSession *session;
+
+ 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");
}
* @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)
{
- /* core is only used to retrieve the peer identity */
- static const struct GNUNET_CORE_MessageHandler core_handlers[] = {
- {NULL, 0, 0}
- };
static const struct GNUNET_SERVER_MessageHandler server_handlers[] = {
- {&client_join, NULL, GNUNET_MESSAGE_TYPE_CONSENSUS_CLIENT_JOIN, 0},
- {&client_insert, NULL, GNUNET_MESSAGE_TYPE_CONSENSUS_CLIENT_INSERT, 0},
{&client_conclude, NULL, GNUNET_MESSAGE_TYPE_CONSENSUS_CLIENT_CONCLUDE,
- sizeof (struct GNUNET_CONSENSUS_ConcludeMessage)},
- {&client_ack, NULL, GNUNET_MESSAGE_TYPE_CONSENSUS_CLIENT_ACK,
- sizeof (struct GNUNET_CONSENSUS_AckMessage)},
+ sizeof (struct GNUNET_MessageHeader)},
+ {&client_insert, NULL, GNUNET_MESSAGE_TYPE_CONSENSUS_CLIENT_INSERT, 0},
+ {&client_join, NULL, GNUNET_MESSAGE_TYPE_CONSENSUS_CLIENT_JOIN, 0},
{NULL, NULL, 0, 0}
};
cfg = c;
srv = server;
-
+ 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);
-
- listener = GNUNET_STREAM_listen (cfg, GNUNET_APPLICATION_TYPE_CONSENSUS,
- listen_cb, NULL,
- GNUNET_STREAM_OPTION_END);
-
- /* we have to wait for the core_startup callback before proceeding with the consensus service startup */
- core = GNUNET_CORE_connect (c, NULL, &core_startup, NULL, NULL, NULL, GNUNET_NO, NULL, GNUNET_NO, core_handlers);
- GNUNET_assert (NULL != core);
-
- GNUNET_log(GNUNET_ERROR_TYPE_INFO, "consensus running\n");
+ GNUNET_SERVER_disconnect_notify (server, handle_client_disconnect, NULL);
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO, "consensus running\n");
}
{
int ret;
ret = GNUNET_SERVICE_run (argc, argv, "consensus", GNUNET_SERVICE_OPTION_NONE, &run, NULL);
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "exit\n");
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO, "exit (%d)\n", GNUNET_OK != ret);
return (GNUNET_OK == ret) ? 0 : 1;
}
projects / oweals / gnunet.git / blobdiff