2 This file is part of GNUnet
3 (C) 2004, 2005, 2006, 2007, 2009 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
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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.
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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 * @file include/gnunet_datastore_service.h
23 * @brief API that can be used manage the
24 * datastore for files stored on a GNUnet node;
25 * note that the datastore is NOT responsible for
26 * on-demand encoding, that is achieved using
27 * a special kind of entry.
28 * @author Christian Grothoff
31 #ifndef GNUNET_DATASTORE_SERVICE_H
32 #define GNUNET_DATASTORE_SERVICE_H
34 #include "gnunet_util_lib.h"
39 #if 0 /* keep Emacsens' auto-indent happy */
44 #define GNUNET_DATASTORE_BLOCKTYPE_ANY 0
45 #define GNUNET_DATASTORE_BLOCKTYPE_DBLOCK 1
46 #define GNUNET_DATASTORE_BLOCKTYPE_IBLOCK 2
47 #define GNUNET_DATASTORE_BLOCKTYPE_KBLOCK 3
48 #define GNUNET_DATASTORE_BLOCKTYPE_SBLOCK 4
49 #define GNUNET_DATASTORE_BLOCKTYPE_SKBLOCK 5
52 * Handle to the datastore service.
54 struct GNUNET_DATASTORE_Handle;
58 * Connect to the datastore service.
60 * @param cfg configuration to use
61 * @param sched scheduler to use
62 * @return handle to use to access the service
64 struct GNUNET_DATASTORE_Handle *GNUNET_DATASTORE_connect (const struct
65 GNUNET_CONFIGURATION_Handle
68 GNUNET_SCHEDULER_Handle
73 * Disconnect from the datastore service (and free
74 * associated resources).
76 * @param h handle to the datastore
77 * @param drop set to GNUNET_YES to delete all data in datastore (!)
79 void GNUNET_DATASTORE_disconnect (struct GNUNET_DATASTORE_Handle *h,
84 * Continuation called to notify client about result of the
88 * @param success GNUNET_SYSERR on failure
89 * @param msg NULL on success, otherwise an error message
91 typedef void (*GNUNET_DATASTORE_ContinuationWithStatus)(void *cls,
97 * Reserve space in the datastore. This function should be used
98 * to avoid "out of space" failures during a longer sequence of "put"
99 * operations (for example, when a file is being inserted).
101 * @param h handle to the datastore
102 * @param amount how much space (in bytes) should be reserved (for content only)
103 * @param entries how many entries will be created (to calculate per-entry overhead)
104 * @param cont continuation to call when done; "success" will be set to
105 * a positive reservation value if space could be reserved.
106 * @param cont_cls closure for cont
107 * @param timeout how long to wait at most for a response
110 GNUNET_DATASTORE_reserve (struct GNUNET_DATASTORE_Handle *h,
113 GNUNET_DATASTORE_ContinuationWithStatus cont,
115 struct GNUNET_TIME_Relative timeout);
119 * Store an item in the datastore. If the item is already present,
120 * the priorities are summed up and the higher expiration time and
121 * lower anonymity level is used.
123 * @param h handle to the datastore
124 * @param rid reservation ID to use (from "reserve"); use 0 if no
125 * prior reservation was made
126 * @param key key for the value
127 * @param size number of bytes in data
128 * @param data content stored
129 * @param type type of the content
130 * @param priority priority of the content
131 * @param anonymity anonymity-level for the content
132 * @param expiration expiration time for the content
133 * @param timeout timeout for the operation
134 * @param cont continuation to call when done
135 * @param cont_cls closure for cont
138 GNUNET_DATASTORE_put (struct GNUNET_DATASTORE_Handle *h,
140 const GNUNET_HashCode * key,
146 struct GNUNET_TIME_Absolute expiration,
147 struct GNUNET_TIME_Relative timeout,
148 GNUNET_DATASTORE_ContinuationWithStatus cont,
153 * Signal that all of the data for which a reservation was made has
154 * been stored and that whatever excess space might have been reserved
155 * can now be released.
157 * @param h handle to the datastore
158 * @param rid reservation ID (value of "success" in original continuation
159 * from the "reserve" function).
160 * @param cont continuation to call when done
161 * @param cont_cls closure for cont
162 * @param timeout how long to wait at most for a response
165 GNUNET_DATASTORE_release_reserve (struct GNUNET_DATASTORE_Handle *h,
167 GNUNET_DATASTORE_ContinuationWithStatus cont,
169 struct GNUNET_TIME_Relative timeout);
173 * Update a value in the datastore.
175 * @param h handle to the datastore
176 * @param uid identifier for the value
177 * @param priority how much to increase the priority of the value
178 * @param expiration new expiration value should be MAX of existing and this argument
179 * @param cont continuation to call when done
180 * @param cont_cls closure for cont
181 * @param timeout how long to wait at most for a response
184 GNUNET_DATASTORE_update (struct GNUNET_DATASTORE_Handle *h,
185 unsigned long long uid,
187 struct GNUNET_TIME_Absolute expiration,
188 GNUNET_DATASTORE_ContinuationWithStatus cont,
190 struct GNUNET_TIME_Relative timeout);
194 * An iterator over a set of items stored in the datastore.
197 * @param key key for the content
198 * @param size number of bytes in data
199 * @param data content stored
200 * @param type type of the content
201 * @param priority priority of the content
202 * @param anonymity anonymity-level for the content
203 * @param expiration expiration time for the content
204 * @param uid unique identifier for the datum;
205 * maybe 0 if no unique identifier is available
207 typedef void (*GNUNET_DATASTORE_Iterator) (void *cls,
208 const GNUNET_HashCode * key,
214 struct GNUNET_TIME_Absolute
215 expiration, uint64_t uid);
219 * Iterate over the results for a particular key
222 * @param h handle to the datastore
223 * @param key maybe NULL (to match all entries)
224 * @param type desired type, 0 for any
225 * @param iter function to call on each matching value;
226 * will be called once with a NULL value at the end
227 * @param iter_cls closure for iter
228 * @param timeout how long to wait at most for a response
231 GNUNET_DATASTORE_get (struct GNUNET_DATASTORE_Handle *h,
232 const GNUNET_HashCode * key,
234 GNUNET_DATASTORE_Iterator iter, void *iter_cls,
235 struct GNUNET_TIME_Relative timeout);
239 * Get a random value from the datastore.
241 * @param h handle to the datastore
242 * @param iter function to call on a random value; it
243 * will be called once with a value (if available)
244 * and always once with a value of NULL.
245 * @param iter_cls closure for iter
246 * @param timeout how long to wait at most for a response
249 GNUNET_DATASTORE_get_random (struct GNUNET_DATASTORE_Handle *h,
250 GNUNET_DATASTORE_Iterator iter, void *iter_cls,
251 struct GNUNET_TIME_Relative timeout);
255 * Explicitly remove some content from the database.
257 * @param h handle to the datastore
258 * @param key key for the value
259 * @param size number of bytes in data
260 * @param data content stored
261 * @param cont continuation to call when done
262 * @param cont_cls closure for cont
263 * @param timeout how long to wait at most for a response
266 GNUNET_DATASTORE_remove (struct GNUNET_DATASTORE_Handle *h,
267 const GNUNET_HashCode *key,
268 uint32_t size, const void *data,
269 GNUNET_DATASTORE_ContinuationWithStatus cont,
271 struct GNUNET_TIME_Relative timeout);
274 #if 0 /* keep Emacsens' auto-indent happy */
281 /* end of gnunet_datastore_service.h */