1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
/*
This file is part of GNUnet
(C) 2009, 2010 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 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @file include/gnunet_peerinfo_service.h
* @brief Code to maintain the list of currently known hosts
* (in memory structure of data/hosts).
* @author Christian Grothoff
*/
#ifndef GNUNET_PEERINFO_SERVICE_H
#define GNUNET_PEERINFO_SERVICE_H
#include "gnunet_common.h"
#include "gnunet_configuration_lib.h"
#include "gnunet_crypto_lib.h"
#include "gnunet_hello_lib.h"
#ifdef __cplusplus
extern "C"
{
#if 0 /* keep Emacsens' auto-indent happy */
}
#endif
#endif
/**
* Handle to the peerinfo service.
*/
struct GNUNET_PEERINFO_Handle;
/**
* Connect to the peerinfo service.
*
* @param cfg configuration to use
* @return NULL on error (configuration related, actual connection
* etablishment may happen asynchronously).
*/
struct GNUNET_PEERINFO_Handle *
GNUNET_PEERINFO_connect (const struct GNUNET_CONFIGURATION_Handle *cfg);
/**
* Disconnect from the peerinfo service. Note that all iterators must
* have completed or have been cancelled by the time this function is
* called (otherwise, calling this function is a serious error).
* Furthermore, if #GNUNET_PEERINFO_add_peer() operations are still
* pending, they will be cancelled silently on disconnect.
*
* @param h handle to disconnect
*/
void
GNUNET_PEERINFO_disconnect (struct GNUNET_PEERINFO_Handle *h);
/**
* Continuation called with a status result.
*
* @param cls closure
* @param emsg error message, NULL on success
*/
typedef void
(*GNUNET_PEERINFO_Continuation)(void *cls,
const char *emsg);
/**
* Opaque handle to cancel 'add' operation.
*/
struct GNUNET_PEERINFO_AddContext;
/**
* Add a host to the persistent list. This method operates in
* semi-reliable mode: if the transmission is not completed by
* the time #GNUNET_PEERINFO_disconnect() is called, it will be
* aborted. Furthermore, if a second HELLO is added for the
* same peer before the first one was transmitted, PEERINFO may
* merge the two HELLOs prior to transmission to the service.
*
* @param h handle to the peerinfo service
* @param hello the verified (!) HELLO message
* @param cont continuation to call when done, NULL is allowed
* @param cont_cls closure for @a cont
* @return handle to cancel add operation; all pending
* 'add' operations will be cancelled automatically
* on disconnect, so it is not necessary to keep this
* handle (unless @a cont is NULL and at some point
* calling @a cont must be prevented)
*/
struct GNUNET_PEERINFO_AddContext *
GNUNET_PEERINFO_add_peer (struct GNUNET_PEERINFO_Handle *h,
const struct GNUNET_HELLO_Message *hello,
GNUNET_PEERINFO_Continuation cont,
void *cont_cls);
/**
* Cancel pending 'add' operation. Must only be called before
* either 'cont' or #GNUNET_PEERINFO_disconnect() are invoked.
*
* @param ac handle for the add operation to cancel
*/
void
GNUNET_PEERINFO_add_peer_cancel (struct GNUNET_PEERINFO_AddContext *ac);
/**
* Type of an iterator over the hosts. Note that each
* host will be called with each available protocol.
*
* @param cls closure
* @param peer id of the peer, NULL for last call
* @param hello hello message for the peer (can be NULL)
* @param error message
*/
typedef void
(*GNUNET_PEERINFO_Processor) (void *cls,
const struct GNUNET_PeerIdentity *peer,
const struct GNUNET_HELLO_Message *hello,
const char *err_msg);
/**
* Handle for cancellation of iteration over peers.
*/
struct GNUNET_PEERINFO_IteratorContext;
/**
* Call a method for each known matching host. The callback method
* will be invoked once for each matching host and then finally once
* with a NULL pointer. After that final invocation, the iterator
* context must no longer be used.
*
* Instead of calling this function with `peer == NULL` it is often
* better to use #GNUNET_PEERINFO_notify().
*
* @param h handle to the peerinfo service
* @param include_friend_only include HELLO messages for friends only
* @param peer restrict iteration to this peer only (can be NULL)
* @param timeout how long to wait until timing out
* @param callback the method to call for each peer
* @param callback_cls closure for @a callback
* @return iterator context
*/
struct GNUNET_PEERINFO_IteratorContext *
GNUNET_PEERINFO_iterate (struct GNUNET_PEERINFO_Handle *h,
int include_friend_only,
const struct GNUNET_PeerIdentity *peer,
struct GNUNET_TIME_Relative timeout,
GNUNET_PEERINFO_Processor callback, void *callback_cls);
/**
* Cancel an iteration over peer information.
*
* @param ic context of the iterator to cancel
*/
void
GNUNET_PEERINFO_iterate_cancel (struct GNUNET_PEERINFO_IteratorContext *ic);
/**
* Handle for notifications about changes to the set of known peers.
*/
struct GNUNET_PEERINFO_NotifyContext;
/**
* Call a method whenever our known information about peers
* changes. Initially calls the given function for all known
* peers and then only signals changes.
*
* If include_friend_only is set to GNUNET_YES peerinfo will include HELLO
* messages which are intended for friend to friend mode and which do not
* have to be gossiped. Otherwise these messages are skipped.
*
* @param cfg configuration to use
* @param include_friend_only include HELLO messages for friends only
* @param callback the method to call for each peer
* @param callback_cls closure for @a callback
* @return NULL on error
*/
struct GNUNET_PEERINFO_NotifyContext *
GNUNET_PEERINFO_notify (const struct GNUNET_CONFIGURATION_Handle *cfg,
int include_friend_only,
GNUNET_PEERINFO_Processor callback,
void *callback_cls);
/**
* Stop notifying about changes.
*
* @param nc context to stop notifying
*/
void
GNUNET_PEERINFO_notify_cancel (struct GNUNET_PEERINFO_NotifyContext *nc);
#if 0 /* keep Emacsens' auto-indent happy */
{
#endif
#ifdef __cplusplus
}
#endif
/* end of gnunet_peerinfo_service.h */
#endif
|
