2 This file is part of GNUnet
3 (C) 2012 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file include/gnunet_consensus_service.h
24 * @author Florian Dold
27 #ifndef GNUNET_CONSENSUS_SERVICE_H
28 #define GNUNET_CONSENSUS_SERVICE_H
33 #if 0 /* keep Emacsens' auto-indent happy */
39 #include "gnunet_common.h"
40 #include "gnunet_time_lib.h"
44 * Called when a new element was received from another peer; elements
45 * given to a consensus operation by the local peer are NOT given
49 * @param element_size will match the size given to GNUNET_CONSENSUS_create
52 typedef void (*GNUNET_CONSENSUS_NewElementCallback) (void *cls,
59 * Opaque handle for the consensus service.
61 struct GNUNET_CONSENSUS_Handle;
65 * Create a consensus session.
69 * @param peers array of peers participating in this consensus session
70 * @param session_id session identifier
71 * Allows a group of peers to have more than consensus session.
72 * @param element_size size of the elements in the reconciled set in bytes
73 * @param num_initial_elements number of entries in the 'initial_elements' array
74 * @param initial_elements our elements for the consensus (each of 'element_size'
75 * @param new_element callback, called when a new element is added to the set by
77 * @param new_element_cls closure for new_element
78 * @return handle to use, NULL on error
80 struct GNUNET_CONSENSUS_Handle *
81 GNUNET_CONSENSUS_create (const struct GNUNET_CONFIGURATION_Handle *cfg,
82 unsigned int num_peers,
83 const struct GNUNET_PeerIdentity *peers,
84 const struct GNUNET_HashCode *session_id,
86 unsigned int num_initial_elements,
87 const void **initial_elements,
88 GNUNET_CONSENSUS_NewElementCallback new_element,
89 void *new_element_cls);
93 * Called when an insertion (transmission to consensus service,
94 * which does not imply fully consensus on this element with
95 * all other peers) was successful.
98 * @param success GNUNET_OK on success, GNUNET_SYSERR if
99 * the insertion and thus the consensus failed for good
101 typedef void (*GNUNET_CONSENSUS_InsertDoneCallback) (void *cls,
106 * Insert an element in the set being reconsiled. Must not be called after
107 * "GNUNET_CONSENSUS_conclude".
109 * @param consensus handle for the consensus session
110 * @param element_size must match element size from GNUNET_CONSENSUS_create
111 * @param element the element to be inserted
112 * @param idc function called when we are done with this element and it
113 * is thus allowed to call GNUNET_CONSENSUS_insert again
114 * @param idc_cls closure for 'idc'
117 GNUNET_CONSENSUS_insert (struct GNUNET_CONSENSUS_Handle *consensus,
120 GNUNET_CONSENSUS_InsertDoneCallback idc,
125 * Called when a conclusion was successful.
128 * @param num_peers_in_consensus
129 * @param peers_in_consensus
131 typedef void (*GNUNET_CONSENSUS_ConcludeCallback) (void *cls,
132 unsigned int num_peers_in_consensus,
133 const struct GNUNET_PeerIdentity *peers_in_consensus);
137 * We are finished inserting new elements into the consensus;
138 * try to conclude the consensus within a given time window.
140 * @param consensus consensus session
141 * @param timeout timeout after which the conculde callback
143 * @param conclude called when the conclusion was successful
144 * @param conclude_cls closure for the conclude callback
147 GNUNET_CONSENSUS_conclude (struct GNUNET_CONSENSUS_Handle *consensus,
148 struct GNUNET_TIME_Relative timeout,
149 GNUNET_CONSENSUS_ConcludeCallback conclude,
154 * Destroy a consensus handle (free all state associated with
155 * it, no longer call any of the callbacks).
157 * @param consensus handle to destroy
160 GNUNET_CONSENSUS_destroy (struct GNUNET_CONSENSUS_Handle *consensus);
163 #if 0 /* keep Emacsens' auto-indent happy */