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22 * @author Omar Tarabai
25 * API to the peerstore service
27 * @defgroup peerstore Peer Store service
29 * @see [Documentation](https://gnunet.org/gnunets-peerstore-subsystem)
33 #ifndef GNUNET_PEERSTORE_SERVICE_H
34 #define GNUNET_PEERSTORE_SERVICE_H
36 #include "gnunet_util_lib.h"
37 #include "gnunet_common.h"
42 #if 0 /* keep Emacsens' auto-indent happy */
48 * Options for storing values in PEERSTORE
50 enum GNUNET_PEERSTORE_StoreOption
54 * Possibly store multiple values under given key.
56 GNUNET_PEERSTORE_STOREOPTION_MULTIPLE = 0,
59 * Delete any previous values for the given key before
60 * storing the given value.
62 GNUNET_PEERSTORE_STOREOPTION_REPLACE = 1
67 * Handle to the peerstore service.
69 struct GNUNET_PEERSTORE_Handle;
72 * Context for a store request
74 struct GNUNET_PEERSTORE_StoreContext;
77 * Single PEERSTORE record
79 struct GNUNET_PEERSTORE_Record
83 * Responsible sub system string
90 struct GNUNET_PeerIdentity *peer;
103 * Size of @e value BLOB
108 * Expiry time of entry
110 struct GNUNET_TIME_Absolute *expiry;
113 * Client from which this record originated
115 struct GNUNET_SERVER_Client *client;
120 * Continuation called with a status result.
123 * @param success #GNUNET_OK or #GNUNET_SYSERR
126 (*GNUNET_PEERSTORE_Continuation)(void *cls,
131 * Function called by PEERSTORE for each matching record.
134 * @param record peerstore record information
135 * @param emsg error message, or NULL if no errors
138 (*GNUNET_PEERSTORE_Processor) (void *cls,
139 const struct GNUNET_PEERSTORE_Record *record,
143 * Connect to the PEERSTORE service.
145 * @return NULL on error
147 struct GNUNET_PEERSTORE_Handle *
148 GNUNET_PEERSTORE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg);
152 * Disconnect from the PEERSTORE service. Any pending ITERATE and WATCH requests
154 * Any pending STORE requests will depend on @e snyc_first flag.
156 * @param h handle to disconnect
157 * @param sync_first send any pending STORE requests before disconnecting
160 GNUNET_PEERSTORE_disconnect (struct GNUNET_PEERSTORE_Handle *h,
165 * Store a new entry in the PEERSTORE.
166 * Note that stored entries can be lost in some cases
167 * such as power failure.
169 * @param h Handle to the PEERSTORE service
170 * @param sub_system name of the sub system
171 * @param peer Peer Identity
172 * @param key entry key
173 * @param value entry value BLOB
174 * @param size size of @e value
175 * @param expiry absolute time after which the entry is (possibly) deleted
176 * @param options options specific to the storage operation
177 * @param cont Continuation function after the store request is sent
178 * @param cont_cls Closure for @a cont
180 struct GNUNET_PEERSTORE_StoreContext *
181 GNUNET_PEERSTORE_store (struct GNUNET_PEERSTORE_Handle *h,
182 const char *sub_system,
183 const struct GNUNET_PeerIdentity *peer,
187 struct GNUNET_TIME_Absolute expiry,
188 enum GNUNET_PEERSTORE_StoreOption options,
189 GNUNET_PEERSTORE_Continuation cont,
194 * Cancel a store request
196 * @param sc Store request context
199 GNUNET_PEERSTORE_store_cancel (struct GNUNET_PEERSTORE_StoreContext *sc);
203 * Iterate over records matching supplied key information
205 * @param h handle to the PEERSTORE service
206 * @param sub_system name of sub system
207 * @param peer Peer identity (can be NULL)
208 * @param key entry key string (can be NULL)
209 * @param timeout time after which the iterate request is canceled
210 * @param callback function called with each matching record, all NULL's on end
211 * @param callback_cls closure for @a callback
213 struct GNUNET_PEERSTORE_IterateContext *
214 GNUNET_PEERSTORE_iterate (struct GNUNET_PEERSTORE_Handle *h,
215 const char *sub_system,
216 const struct GNUNET_PeerIdentity *peer,
218 struct GNUNET_TIME_Relative timeout,
219 GNUNET_PEERSTORE_Processor callback,
224 * Cancel an iterate request
225 * Please do not call after the iterate request is done
227 * @param ic Iterate request context as returned by GNUNET_PEERSTORE_iterate()
230 GNUNET_PEERSTORE_iterate_cancel (struct GNUNET_PEERSTORE_IterateContext *ic);
234 * Request watching a given key
235 * User will be notified with any new values added to key.
237 * @param h handle to the PEERSTORE service
238 * @param sub_system name of sub system
239 * @param peer Peer identity
240 * @param key entry key string
241 * @param callback function called with each new value
242 * @param callback_cls closure for @a callback
243 * @return Handle to watch request
245 struct GNUNET_PEERSTORE_WatchContext *
246 GNUNET_PEERSTORE_watch (struct GNUNET_PEERSTORE_Handle *h,
247 const char *sub_system,
248 const struct GNUNET_PeerIdentity *peer,
250 GNUNET_PEERSTORE_Processor callback,
255 * Cancel a watch request
257 * @param wc handle to the watch request
260 GNUNET_PEERSTORE_watch_cancel (struct GNUNET_PEERSTORE_WatchContext *wc);
263 #if 0 /* keep Emacsens' auto-indent happy */
272 /** @} */ /* end of group */