aboutsummaryrefslogtreecommitdiff
path: root/src/include/gnunet_block_lib.h
blob: 7d06d592f491b666805b4fe6d11880804557496f (plain) (blame)
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
/*
     This file is part of GNUnet.
     (C) 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_block_lib.h
 * @brief library for data block manipulation
 * @author Christian Grothoff
 */
#ifndef GNUNET_BLOCK_LIB_H
#define GNUNET_BLOCK_LIB_H

#include "gnunet_util_lib.h"
#ifdef __cplusplus
extern "C"
{
#if 0                           /* keep Emacsens' auto-indent happy */
}
#endif
#endif


/**
 * Blocks in the datastore and the datacache must have a unique type.
 */
enum GNUNET_BLOCK_Type 
  {
    /**
     * Any type of block, used as a wildcard when searching.  Should
     * never be attached to a specific block.
     */
    GNUNET_BLOCK_TYPE_ANY = 0,

    /**
     * Data block (leaf) in the CHK tree.
     */
    GNUNET_BLOCK_TYPE_DBLOCK = 1,

    /**
     * Inner block in the CHK tree.
     */
    GNUNET_BLOCK_TYPE_IBLOCK = 2,

    /**
     * Type of a block representing a keyword search result.
     */
    GNUNET_BLOCK_TYPE_KBLOCK = 3,

    /**
     * Type of a block that is used to advertise content in a namespace.
     */
    GNUNET_BLOCK_TYPE_SBLOCK = 4,

    /**
     * Type of a block representing a block to be encoded on demand from disk.
     * Should never appear on the network directly.
     */
    GNUNET_BLOCK_TYPE_ONDEMAND = 5,

    /**
     * Type of a block that is used to advertise a namespace.  
     */
    GNUNET_BLOCK_TYPE_NBLOCK = 6,

    GNUNET_BLOCK_TYPE_TEST = 9999

  };




/**
 * Possible ways for how a block may relate to a query.
 */
enum GNUNET_BLOCK_EvaluationResult
  {
    /**
     * Valid result, and there may be more.
     */
    GNUNET_BLOCK_EVALUATION_OK_MORE = 0,

    /**
     * Last possible valid result.
     */
    GNUNET_BLOCK_EVALUATION_OK_LAST = 1,

    /**
     * Valid result, but suppressed because it is a duplicate.
     */
    GNUNET_BLOCK_EVALUATION_OK_DUPLICATE = 2,

    /**
     * Block does not match query (invalid result)
     */
    GNUNET_BLOCK_EVALUATION_RESULT_INVALID = 3,

    /**
     * Query is valid, no reply given.
     */
    GNUNET_BLOCK_EVALUATION_REQUEST_VALID = 4,

    /**
     * Query format does not match block type (invalid query).  For
     * example, xquery not given or xquery_size not appropriate for
     * type.
     */
    GNUNET_BLOCK_EVALUATION_REQUEST_INVALID = 5,

    /**
     * Specified block type not supported by this plugin.
     */
    GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED = 6
  };


/**
 * Handle to an initialized block library.
 */
struct GNUNET_BLOCK_Context;


/**
 * Create a block context.  Loads the block plugins.
 *
 * @param cfg configuration to use
 * @return NULL on error
 */
struct GNUNET_BLOCK_Context *
GNUNET_BLOCK_context_create (const struct GNUNET_CONFIGURATION_Handle *cfg);


/**
 * Destroy the block context.
 *
 * @param ctx context to destroy
 */
void
GNUNET_BLOCK_context_destroy (struct GNUNET_BLOCK_Context *ctx);


/**
 * Function called to validate a reply or a request.  For
 * request evaluation, simply pass "NULL" for the reply_block.
 * Note that it is assumed that the reply has already been 
 * matched to the key (and signatures checked) as it would
 * be done with the "get_key" function.
 *
 * @param ctx block contxt
 * @param type block type
 * @param query original query (hash)
 * @param bf pointer to bloom filter associated with query; possibly updated (!)
 * @param bf_mutator mutation value for bf
 * @param xquery extrended query data (can be NULL, depending on type)
 * @param xquery_size number of bytes in xquery
 * @param reply_block response to validate
 * @param reply_block_size number of bytes in reply block
 * @return characterization of result
 */
enum GNUNET_BLOCK_EvaluationResult
GNUNET_BLOCK_evaluate (struct GNUNET_BLOCK_Context *ctx,
		       enum GNUNET_BLOCK_Type type,
		       const GNUNET_HashCode *query,
		       struct GNUNET_CONTAINER_BloomFilter **bf,
		       int32_t bf_mutator,
		       const void *xquery,
		       size_t xquery_size,
		       const void *reply_block,
		       size_t reply_block_size);


/**
 * Function called to obtain the key for a block.
 *
 * @param ctx block context
 * @param type block type
 * @param block block to get the key for
 * @param block_size number of bytes in block
 * @param key set to the key (query) for the given block
 * @return GNUNET_OK on success, GNUNET_SYSERR if type not supported
 *         (or if extracting a key from a block of this type does not work)
 */
int
GNUNET_BLOCK_get_key (struct GNUNET_BLOCK_Context *ctx,
		      enum GNUNET_BLOCK_Type type,
		      const void *block,
		      size_t block_size,
		      GNUNET_HashCode *key);


#if 0                           /* keep Emacsens' auto-indent happy */
{
#endif
#ifdef __cplusplus
}
#endif


/* ifndef GNUNET_BLOCK_LIB_H */
#endif
/* end of gnunet_block_lib.h */