2 This file is part of GNUnet
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your 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 Affero General Public License for more details.
17 * @author Omar Tarabai
20 * API to the peerstore service
22 * @defgroup peerstore Peer Store service
24 * @see [Documentation](https://gnunet.org/gnunets-peerstore-subsystem)
28 #ifndef GNUNET_PEERSTORE_SERVICE_H
29 #define GNUNET_PEERSTORE_SERVICE_H
31 #include "gnunet_util_lib.h"
36 #if 0 /* keep Emacsens' auto-indent happy */
42 * Options for storing values in PEERSTORE
44 enum GNUNET_PEERSTORE_StoreOption
48 * Possibly store multiple values under given key.
50 GNUNET_PEERSTORE_STOREOPTION_MULTIPLE = 0,
53 * Delete any previous values for the given key before
54 * storing the given value.
56 GNUNET_PEERSTORE_STOREOPTION_REPLACE = 1
61 * Handle to the peerstore service.
63 struct GNUNET_PEERSTORE_Handle;
66 * Context for a store request
68 struct GNUNET_PEERSTORE_StoreContext;
71 * Single PEERSTORE record
73 struct GNUNET_PEERSTORE_Record
77 * Responsible sub system string
84 struct GNUNET_PeerIdentity peer;
97 * Size of @e value BLOB
102 * Expiry time of entry
104 struct GNUNET_TIME_Absolute expiry;
107 * Client from which this record originated.
108 * NOTE: This is internal to the service.
110 struct GNUNET_SERVICE_Client *client;
115 * Continuation called with a status result.
118 * @param success #GNUNET_OK or #GNUNET_SYSERR
121 (*GNUNET_PEERSTORE_Continuation)(void *cls,
126 * Function called by PEERSTORE for each matching record.
129 * @param record peerstore record information
130 * @param emsg error message, or NULL if no errors
133 (*GNUNET_PEERSTORE_Processor) (void *cls,
134 const struct GNUNET_PEERSTORE_Record *record,
139 * Connect to the PEERSTORE service.
141 * @return NULL on error
143 struct GNUNET_PEERSTORE_Handle *
144 GNUNET_PEERSTORE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg);
148 * Disconnect from the PEERSTORE service. Any pending ITERATE and WATCH requests
150 * Any pending STORE requests will depend on @e snyc_first flag.
152 * @param h handle to disconnect
153 * @param sync_first send any pending STORE requests before disconnecting
156 GNUNET_PEERSTORE_disconnect (struct GNUNET_PEERSTORE_Handle *h,
161 * Store a new entry in the PEERSTORE.
162 * Note that stored entries can be lost in some cases
163 * such as power failure.
165 * @param h Handle to the PEERSTORE service
166 * @param sub_system name of the sub system
167 * @param peer Peer Identity
168 * @param key entry key
169 * @param value entry value BLOB
170 * @param size size of @e value
171 * @param expiry absolute time after which the entry is (possibly) deleted
172 * @param options options specific to the storage operation
173 * @param cont Continuation function after the store request is sent
174 * @param cont_cls Closure for @a cont
176 struct GNUNET_PEERSTORE_StoreContext *
177 GNUNET_PEERSTORE_store (struct GNUNET_PEERSTORE_Handle *h,
178 const char *sub_system,
179 const struct GNUNET_PeerIdentity *peer,
183 struct GNUNET_TIME_Absolute expiry,
184 enum GNUNET_PEERSTORE_StoreOption options,
185 GNUNET_PEERSTORE_Continuation cont,
190 * Cancel a store request
192 * @param sc Store request context
195 GNUNET_PEERSTORE_store_cancel (struct GNUNET_PEERSTORE_StoreContext *sc);
199 * Iterate over records matching supplied key information
201 * @param h handle to the PEERSTORE service
202 * @param sub_system name of sub system
203 * @param peer Peer identity (can be NULL)
204 * @param key entry key string (can be NULL)
205 * @param timeout time after which the iterate request is canceled
206 * @param callback function called with each matching record, all NULL's on end
207 * @param callback_cls closure for @a callback
209 struct GNUNET_PEERSTORE_IterateContext *
210 GNUNET_PEERSTORE_iterate (struct GNUNET_PEERSTORE_Handle *h,
211 const char *sub_system,
212 const struct GNUNET_PeerIdentity *peer,
214 struct GNUNET_TIME_Relative timeout,
215 GNUNET_PEERSTORE_Processor callback,
220 * Cancel an iterate request
221 * Please do not call after the iterate request is done
223 * @param ic Iterate request context as returned by GNUNET_PEERSTORE_iterate()
226 GNUNET_PEERSTORE_iterate_cancel (struct GNUNET_PEERSTORE_IterateContext *ic);
230 * Request watching a given key
231 * User will be notified with any new values added to key.
233 * @param h handle to the PEERSTORE service
234 * @param sub_system name of sub system
235 * @param peer Peer identity
236 * @param key entry key string
237 * @param callback function called with each new value
238 * @param callback_cls closure for @a callback
239 * @return Handle to watch request
241 struct GNUNET_PEERSTORE_WatchContext *
242 GNUNET_PEERSTORE_watch (struct GNUNET_PEERSTORE_Handle *h,
243 const char *sub_system,
244 const struct GNUNET_PeerIdentity *peer,
246 GNUNET_PEERSTORE_Processor callback,
251 * Cancel a watch request
253 * @param wc handle to the watch request
256 GNUNET_PEERSTORE_watch_cancel (struct GNUNET_PEERSTORE_WatchContext *wc);
259 #if 0 /* keep Emacsens' auto-indent happy */
268 /** @} */ /* end of group */