2 This file is part of GNUnet
3 Copyright (C) 2012, 2013 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 3, 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
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18 Boston, MA 02110-1301, USA.
22 * @author Christian Grothoff
25 * API that can be used to store naming information on a GNUnet node;
27 * @defgroup namestore Name Store service
28 * Store naming information on a GNUnet node.
30 * Naming information can either be records for which this peer/user is
31 * authoritative, or blocks which are cached, encrypted naming data from other
36 #ifndef GNUNET_NAMESTORE_SERVICE_H
37 #define GNUNET_NAMESTORE_SERVICE_H
39 #include "gnunet_util_lib.h"
40 #include "gnunet_block_lib.h"
41 #include "gnunet_gnsrecord_lib.h"
46 #if 0 /* keep Emacsens' auto-indent happy */
55 struct GNUNET_NAMESTORE_QueueEntry;
58 * Handle to the namestore service.
60 struct GNUNET_NAMESTORE_Handle;
63 * Handle to the namestore zone iterator.
65 struct GNUNET_NAMESTORE_ZoneIterator;
69 * Connect to the namestore service.
71 * @param cfg configuration to use
72 * @return handle to use to access the service
74 struct GNUNET_NAMESTORE_Handle *
75 GNUNET_NAMESTORE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg);
79 * Disconnect from the namestore service (and free associated
80 * resources). Must not be called from within operation callbacks of
83 * @param h handle to the namestore
86 GNUNET_NAMESTORE_disconnect (struct GNUNET_NAMESTORE_Handle *h);
90 * Continuation called to notify client about result of the
94 * @param success #GNUNET_SYSERR on failure (including timeout/queue drop/failure to validate)
95 * #GNUNET_NO if content was already there or not found
96 * #GNUNET_YES (or other positive value) on success
97 * @param emsg NULL on success, otherwise an error message
100 (*GNUNET_NAMESTORE_ContinuationWithStatus) (void *cls,
106 * Store an item in the namestore. If the item is already present,
107 * it is replaced with the new record. Use an empty array to
108 * remove all records under the given name.
110 * @param h handle to the namestore
111 * @param pkey private key of the zone
112 * @param label name that is being mapped
113 * @param rd_count number of records in the 'rd' array
114 * @param rd array of records with data to store
115 * @param cont continuation to call when done
116 * @param cont_cls closure for @a cont
117 * @return handle to abort the request
119 struct GNUNET_NAMESTORE_QueueEntry *
120 GNUNET_NAMESTORE_records_store (struct GNUNET_NAMESTORE_Handle *h,
121 const struct GNUNET_CRYPTO_EcdsaPrivateKey *pkey,
123 unsigned int rd_count,
124 const struct GNUNET_GNSRECORD_Data *rd,
125 GNUNET_NAMESTORE_ContinuationWithStatus cont,
131 * Process a record that was stored in the namestore.
134 * @param zone private key of the zone; NULL on disconnect
135 * @param label label of the records; NULL on disconnect
136 * @param rd_count number of entries in @a rd array, 0 if label was deleted
137 * @param rd array of records with data to store
140 (*GNUNET_NAMESTORE_RecordMonitor) (void *cls,
141 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone,
143 unsigned int rd_count,
144 const struct GNUNET_GNSRECORD_Data *rd);
148 * Set the desired nick name for a zone
150 * @param h handle to the namestore
151 * @param pkey private key of the zone
152 * @param nick the nick name to set
153 * @param cont continuation to call when done
154 * @param cont_cls closure for 'cont'
155 * @return handle to abort the request
157 struct GNUNET_NAMESTORE_QueueEntry *
158 GNUNET_NAMESTORE_set_nick (struct GNUNET_NAMESTORE_Handle *h,
159 const struct GNUNET_CRYPTO_EcdsaPrivateKey *pkey,
161 GNUNET_NAMESTORE_ContinuationWithStatus cont,
166 * Lookup an item in the namestore.
168 * @param h handle to the namestore
169 * @param pkey private key of the zone
170 * @param label name that is being mapped
171 * @param rm function to call with the result (with 0 records if we don't have that label)
172 * @param rm_cls closure for @a rm
173 * @return handle to abort the request
175 struct GNUNET_NAMESTORE_QueueEntry *
176 GNUNET_NAMESTORE_records_lookup (struct GNUNET_NAMESTORE_Handle *h,
177 const struct GNUNET_CRYPTO_EcdsaPrivateKey *pkey,
179 GNUNET_NAMESTORE_RecordMonitor rm,
184 * Look for an existing PKEY delegation record for a given public key.
185 * Returns at most one result to the processor.
187 * @param h handle to the namestore
188 * @param zone public key of the zone to look up in, never NULL
189 * @param value_zone public key of the target zone (value), never NULL
190 * @param proc function to call on the matching records, or with
191 * NULL (rd_count == 0) if there are no matching records
192 * @param proc_cls closure for @a proc
193 * @return a handle that can be used to
196 struct GNUNET_NAMESTORE_QueueEntry *
197 GNUNET_NAMESTORE_zone_to_name (struct GNUNET_NAMESTORE_Handle *h,
198 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone,
199 const struct GNUNET_CRYPTO_EcdsaPublicKey *value_zone,
200 GNUNET_NAMESTORE_RecordMonitor proc, void *proc_cls);
204 * Cancel a namestore operation. The final callback from the
205 * operation must not have been done yet. Must be called on any
206 * namestore operation that has not yet completed prior to calling
207 * #GNUNET_NAMESTORE_disconnect.
209 * @param qe operation to cancel
212 GNUNET_NAMESTORE_cancel (struct GNUNET_NAMESTORE_QueueEntry *qe);
216 * Starts a new zone iteration (used to periodically PUT all of our
217 * records into our DHT). This MUST lock the struct GNUNET_NAMESTORE_Handle
218 * for any other calls than #GNUNET_NAMESTORE_zone_iterator_next and
219 * #GNUNET_NAMESTORE_zone_iteration_stop. @a proc will be called once
220 * immediately, and then again after
221 * #GNUNET_NAMESTORE_zone_iterator_next is invoked.
223 * @param h handle to the namestore
224 * @param zone zone to access, NULL for all zones
225 * @param proc function to call on each name from the zone; it
226 * will be called repeatedly with a value (if available)
227 * and always once at the end with a label of NULL.
228 * @param proc_cls closure for @a proc
229 * @return an iterator handle to use for iteration
231 struct GNUNET_NAMESTORE_ZoneIterator *
232 GNUNET_NAMESTORE_zone_iteration_start (struct GNUNET_NAMESTORE_Handle *h,
233 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone,
234 GNUNET_NAMESTORE_RecordMonitor proc,
239 * Calls the record processor specified in #GNUNET_NAMESTORE_zone_iteration_start
240 * for the next record.
242 * @param it the iterator
245 GNUNET_NAMESTORE_zone_iterator_next (struct GNUNET_NAMESTORE_ZoneIterator *it);
249 * Stops iteration and releases the namestore handle for further calls. Must
250 * be called on any iteration that has not yet completed prior to calling
251 * #GNUNET_NAMESTORE_disconnect.
253 * @param it the iterator
256 GNUNET_NAMESTORE_zone_iteration_stop (struct GNUNET_NAMESTORE_ZoneIterator *it);
260 * Handle for a monitoring activity.
262 struct GNUNET_NAMESTORE_ZoneMonitor;
266 * Function called once the monitor has caught up with the current
267 * state of the database. Will be called AGAIN after each disconnect
268 * (record monitor called with 'NULL' for zone_key) once we're again
274 (*GNUNET_NAMESTORE_RecordsSynchronizedCallback)(void *cls);
278 * Begin monitoring a zone for changes. Will first call the @a
279 * monitor function on all existing records in the selected zone(s) if
280 * @a iterate_first is #GNUNET_YES. In any case, we will then call @a
281 * sync_cb, and then afterwards call the @a monitor whenever a record
282 * changes. If the namestore disconnects, the @a monitor function is
283 * called with a disconnect event; if the connection is
284 * re-established, the process begins from the start (depending on @a
285 * iterate_first, we first do all existing records, then @a sync, then
288 * @param cfg configuration to use to connect to namestore
289 * @param zone zone to monitor, NULL for all zones
290 * @param iterate_first #GNUNET_YES to first iterate over all existing records,
291 * #GNUNET_NO to only return changes that happen from now on
292 * @param monitor function to call on zone changes
293 * @param sync_cb function called when we're in sync with the namestore
294 * @param cls closure for @a monitor and @a sync_cb
295 * @return handle to stop monitoring
297 struct GNUNET_NAMESTORE_ZoneMonitor *
298 GNUNET_NAMESTORE_zone_monitor_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
299 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone,
301 GNUNET_NAMESTORE_RecordMonitor monitor,
302 GNUNET_NAMESTORE_RecordsSynchronizedCallback sync_cb,
307 * Stop monitoring a zone for changes.
309 * @param zm handle to the monitor activity to stop
312 GNUNET_NAMESTORE_zone_monitor_stop (struct GNUNET_NAMESTORE_ZoneMonitor *zm);
315 #if 0 /* keep Emacsens' auto-indent happy */
324 /** @} */ /* end of group */