2 This file is part of GNUnet
3 (C) 2012, 2013 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
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22 * @file include/gnunet_namestore_service.h
23 * @brief API that can be used to store naming information on a GNUnet node;
24 * Naming information can either be records for which this peer/user
25 * is authoritative, or blocks which are cached, encrypted naming
26 * data from other peers.
27 * @author Christian Grothoff
29 #ifndef GNUNET_NAMESTORE_SERVICE_H
30 #define GNUNET_NAMESTORE_SERVICE_H
32 #include "gnunet_util_lib.h"
33 #include "gnunet_block_lib.h"
34 #include "gnunet_gnsrecord_lib.h"
39 #if 0 /* keep Emacsens' auto-indent happy */
48 struct GNUNET_NAMESTORE_QueueEntry;
51 * Handle to the namestore service.
53 struct GNUNET_NAMESTORE_Handle;
56 * Handle to the namestore zone iterator.
58 struct GNUNET_NAMESTORE_ZoneIterator;
62 * Connect to the namestore service.
64 * @param cfg configuration to use
65 * @return handle to use to access the service
67 struct GNUNET_NAMESTORE_Handle *
68 GNUNET_NAMESTORE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg);
72 * Disconnect from the namestore service (and free associated
73 * resources). Must not be called from within operation callbacks of
76 * @param h handle to the namestore
79 GNUNET_NAMESTORE_disconnect (struct GNUNET_NAMESTORE_Handle *h);
83 * Continuation called to notify client about result of the
87 * @param success #GNUNET_SYSERR on failure (including timeout/queue drop/failure to validate)
88 * #GNUNET_NO if content was already there or not found
89 * #GNUNET_YES (or other positive value) on success
90 * @param emsg NULL on success, otherwise an error message
93 (*GNUNET_NAMESTORE_ContinuationWithStatus) (void *cls,
99 * Store an item in the namestore. If the item is already present,
100 * it is replaced with the new record. Use an empty array to
101 * remove all records under the given name.
103 * @param h handle to the namestore
104 * @param pkey private key of the zone
105 * @param label name that is being mapped
106 * @param rd_count number of records in the 'rd' array
107 * @param rd array of records with data to store
108 * @param cont continuation to call when done
109 * @param cont_cls closure for @a cont
110 * @return handle to abort the request
112 struct GNUNET_NAMESTORE_QueueEntry *
113 GNUNET_NAMESTORE_records_store (struct GNUNET_NAMESTORE_Handle *h,
114 const struct GNUNET_CRYPTO_EcdsaPrivateKey *pkey,
116 unsigned int rd_count,
117 const struct GNUNET_GNSRECORD_Data *rd,
118 GNUNET_NAMESTORE_ContinuationWithStatus cont,
124 * Process a record that was stored in the namestore.
127 * @param zone private key of the zone; NULL on disconnect
128 * @param label label of the records; NULL on disconnect
129 * @param rd_count number of entries in @a rd array, 0 if label was deleted
130 * @param rd array of records with data to store
133 (*GNUNET_NAMESTORE_RecordMonitor) (void *cls,
134 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone,
136 unsigned int rd_count,
137 const struct GNUNET_GNSRECORD_Data *rd);
141 * Set the desired nick name for a zone
143 * @param h handle to the namestore
144 * @param pkey private key of the zone
145 * @param nick the nick name to set
146 * @param cont continuation to call when done
147 * @param cont_cls closure for 'cont'
148 * @return handle to abort the request
150 struct GNUNET_NAMESTORE_QueueEntry *
151 GNUNET_NAMESTORE_set_nick (struct GNUNET_NAMESTORE_Handle *h,
152 const struct GNUNET_CRYPTO_EcdsaPrivateKey *pkey,
154 GNUNET_NAMESTORE_ContinuationWithStatus cont,
159 * Lookup an item in the namestore.
161 * @param h handle to the namestore
162 * @param pkey private key of the zone
163 * @param label name that is being mapped
164 * @param rm function to call with the result (with 0 records if we don't have that label)
165 * @param rm_cls closure for @a rm
166 * @return handle to abort the request
168 struct GNUNET_NAMESTORE_QueueEntry *
169 GNUNET_NAMESTORE_records_lookup (struct GNUNET_NAMESTORE_Handle *h,
170 const struct GNUNET_CRYPTO_EcdsaPrivateKey *pkey,
172 GNUNET_NAMESTORE_RecordMonitor rm,
177 * Look for an existing PKEY delegation record for a given public key.
178 * Returns at most one result to the processor.
180 * @param h handle to the namestore
181 * @param zone public key of the zone to look up in, never NULL
182 * @param value_zone public key of the target zone (value), never NULL
183 * @param proc function to call on the matching records, or with
184 * NULL (rd_count == 0) if there are no matching records
185 * @param proc_cls closure for @a proc
186 * @return a handle that can be used to
189 struct GNUNET_NAMESTORE_QueueEntry *
190 GNUNET_NAMESTORE_zone_to_name (struct GNUNET_NAMESTORE_Handle *h,
191 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone,
192 const struct GNUNET_CRYPTO_EcdsaPublicKey *value_zone,
193 GNUNET_NAMESTORE_RecordMonitor proc, void *proc_cls);
197 * Cancel a namestore operation. The final callback from the
198 * operation must not have been done yet. Must be called on any
199 * namestore operation that has not yet completed prior to calling
200 * #GNUNET_NAMESTORE_disconnect.
202 * @param qe operation to cancel
205 GNUNET_NAMESTORE_cancel (struct GNUNET_NAMESTORE_QueueEntry *qe);
209 * Starts a new zone iteration (used to periodically PUT all of our
210 * records into our DHT). This MUST lock the struct GNUNET_NAMESTORE_Handle
211 * for any other calls than #GNUNET_NAMESTORE_zone_iterator_next and
212 * #GNUNET_NAMESTORE_zone_iteration_stop. @a proc will be called once
213 * immediately, and then again after
214 * #GNUNET_NAMESTORE_zone_iterator_next is invoked.
216 * @param h handle to the namestore
217 * @param zone zone to access, NULL for all zones
218 * @param proc function to call on each name from the zone; it
219 * will be called repeatedly with a value (if available)
220 * and always once at the end with a label of NULL.
221 * @param proc_cls closure for @a proc
222 * @return an iterator handle to use for iteration
224 struct GNUNET_NAMESTORE_ZoneIterator *
225 GNUNET_NAMESTORE_zone_iteration_start (struct GNUNET_NAMESTORE_Handle *h,
226 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone,
227 GNUNET_NAMESTORE_RecordMonitor proc,
232 * Calls the record processor specified in #GNUNET_NAMESTORE_zone_iteration_start
233 * for the next record.
235 * @param it the iterator
238 GNUNET_NAMESTORE_zone_iterator_next (struct GNUNET_NAMESTORE_ZoneIterator *it);
242 * Stops iteration and releases the namestore handle for further calls. Must
243 * be called on any iteration that has not yet completed prior to calling
244 * #GNUNET_NAMESTORE_disconnect.
246 * @param it the iterator
249 GNUNET_NAMESTORE_zone_iteration_stop (struct GNUNET_NAMESTORE_ZoneIterator *it);
253 * Handle for a monitoring activity.
255 struct GNUNET_NAMESTORE_ZoneMonitor;
259 * Function called once the monitor has caught up with the current
260 * state of the database. Will be called AGAIN after each disconnect
261 * (record monitor called with 'NULL' for zone_key) once we're again
267 (*GNUNET_NAMESTORE_RecordsSynchronizedCallback)(void *cls);
271 * Begin monitoring a zone for changes. Will first call the @a
272 * monitor function on all existing records in the selected zone(s) if
273 * @a iterate_first is #GNUNET_YES. In any case, we will then call @a
274 * sync_cb, and then afterwards call the @a monitor whenever a record
275 * changes. If the namestore disconnects, the @a monitor function is
276 * called with a disconnect event; if the connection is
277 * re-established, the process begins from the start (depending on @a
278 * iterate_first, we first do all existing records, then @a sync, then
281 * @param cfg configuration to use to connect to namestore
282 * @param zone zone to monitor, NULL for all zones
283 * @param iterate_first #GNUNET_YES to first iterate over all existing records,
284 * #GNUNET_NO to only return changes that happen from now on
285 * @param monitor function to call on zone changes
286 * @param sync_cb function called when we're in sync with the namestore
287 * @param cls closure for @a monitor and @a sync_cb
288 * @return handle to stop monitoring
290 struct GNUNET_NAMESTORE_ZoneMonitor *
291 GNUNET_NAMESTORE_zone_monitor_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
292 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone,
294 GNUNET_NAMESTORE_RecordMonitor monitor,
295 GNUNET_NAMESTORE_RecordsSynchronizedCallback sync_cb,
300 * Stop monitoring a zone for changes.
302 * @param zm handle to the monitor activity to stop
305 GNUNET_NAMESTORE_zone_monitor_stop (struct GNUNET_NAMESTORE_ZoneMonitor *zm);
309 #if 0 /* keep Emacsens' auto-indent happy */
316 /* end of gnunet_namestore_service.h */