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
|
/*
This file is part of GNUnet
(C) 2004, 2005, 2006, 2008, 2009, 2011 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_dht_service.h
* @brief API to the DHT service
* @author Christian Grothoff
*/
#ifndef GNUNET_DHT_SERVICE_H
#define GNUNET_DHT_SERVICE_H
#include "gnunet_util_lib.h"
#include "gnunet_block_lib.h"
#include "gnunet_hello_lib.h"
#ifdef __cplusplus
extern "C"
{
#if 0 /* keep Emacsens' auto-indent happy */
}
#endif
#endif
/**
* Default republication frequency for stored data in the DHT.
*/
#define GNUNET_DHT_DEFAULT_REPUBLISH_FREQUENCY GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MINUTES, 60)
/**
* Connection to the DHT service.
*/
struct GNUNET_DHT_Handle;
/**
* Handle to control a get operation.
*/
struct GNUNET_DHT_GetHandle;
/**
* Handle to control a find peer operation.
*/
struct GNUNET_DHT_FindPeerHandle;
/**
* Options for routing.
*/
enum GNUNET_DHT_RouteOption
{
/**
* Default. Do nothing special.
*/
GNUNET_DHT_RO_NONE = 0,
/**
* Each peer along the way should look at 'enc' (otherwise
* only the k-peers closest to the key should look at it).
*/
GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE = 1,
/**
* We should keep track of the route that the message
* took in the P2P network.
*/
GNUNET_DHT_RO_RECORD_ROUTE = 2,
/**
* This is a 'FIND-PEER' request, so approximate results are fine.
*/
GNUNET_DHT_RO_FIND_PEER = 4,
/**
* Possible message option for query key randomization.
*/
GNUNET_DHT_RO_BART = 8
};
/**
* Initialize the connection with the DHT service.
*
* @param cfg configuration to use
* @param ht_len size of the internal hash table to use for
* processing multiple GET/FIND requests in parallel
* @return NULL on error
*/
struct GNUNET_DHT_Handle *
GNUNET_DHT_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
unsigned int ht_len);
/**
* Shutdown connection with the DHT service.
*
* @param handle connection to shut down
*/
void
GNUNET_DHT_disconnect (struct GNUNET_DHT_Handle *handle);
/* *************** Standard API: get and put ******************* */
/**
* Perform a PUT operation storing data in the DHT.
*
* @param handle handle to DHT service
* @param key the key to store under
* @param desired_replication_level estimate of how many
* nearest peers this request should reach
* @param options routing options for this message
* @param type type of the value
* @param size number of bytes in data; must be less than 64k
* @param data the data to store
* @param exp desired expiration time for the value
* @param timeout how long to wait for transmission of this request
* @param cont continuation to call when done (transmitting request to service)
* @param cont_cls closure for cont
*/
void
GNUNET_DHT_put (struct GNUNET_DHT_Handle *handle, const GNUNET_HashCode * key,
uint32_t desired_replication_level,
enum GNUNET_DHT_RouteOption options,
enum GNUNET_BLOCK_Type type, size_t size, const char *data,
struct GNUNET_TIME_Absolute exp,
struct GNUNET_TIME_Relative timeout, GNUNET_SCHEDULER_Task cont,
void *cont_cls);
/**
* Iterator called on each result obtained for a DHT
* operation that expects a reply
*
* @param cls closure
* @param exp when will this value expire
* @param key key of the result
* @param get_path peers on reply path (or NULL if not recorded)
* @param get_path_length number of entries in get_path
* @param put_path peers on the PUT path (or NULL if not recorded)
* @param put_path_length number of entries in get_path
* @param type type of the result
* @param size number of bytes in data
* @param data pointer to the result data
*/
typedef void (*GNUNET_DHT_GetIterator) (void *cls,
struct GNUNET_TIME_Absolute exp,
const GNUNET_HashCode * key,
const struct GNUNET_PeerIdentity *
get_path, unsigned int get_path_length,
const struct GNUNET_PeerIdentity *
put_path, unsigned int put_path_length,
enum GNUNET_BLOCK_Type type,
size_t size, const void *data);
/**
* Perform an asynchronous GET operation on the DHT identified. See
* also "GNUNET_BLOCK_evaluate".
*
* @param handle handle to the DHT service
* @param timeout how long to wait for transmission of this request to the service
* @param type expected type of the response object
* @param key the key to look up
* @param desired_replication_level estimate of how many
nearest peers this request should reach
* @param options routing options for this message
* @param xquery extended query data (can be NULL, depending on type)
* @param xquery_size number of bytes in xquery
* @param iter function to call on each result
* @param iter_cls closure for iter
*
* @return handle to stop the async get
*/
struct GNUNET_DHT_GetHandle *
GNUNET_DHT_get_start (struct GNUNET_DHT_Handle *handle,
struct GNUNET_TIME_Relative timeout,
enum GNUNET_BLOCK_Type type, const GNUNET_HashCode * key,
uint32_t desired_replication_level,
enum GNUNET_DHT_RouteOption options, const void *xquery,
size_t xquery_size, GNUNET_DHT_GetIterator iter,
void *iter_cls);
/**
* Stop async DHT-get. Frees associated resources.
*
* @param get_handle GET operation to stop.
*
* On return get_handle will no longer be valid, caller
* must not use again!!!
*/
void
GNUNET_DHT_get_stop (struct GNUNET_DHT_GetHandle *get_handle);
#if 0 /* keep Emacsens' auto-indent happy */
{
#endif
#ifdef __cplusplus
}
#endif
#endif
/* gnunet_dht_service.h */
|
