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22 * @file include/gnunet_psycstore_service.h
23 * @brief PSYCstore service; implements persistent storage for the PSYC service
24 * @author Gabor X Toth
25 * @author Christian Grothoff
27 #ifndef GNUNET_PSYCSTORE_SERVICE_H
28 #define GNUNET_PSYCSTORE_SERVICE_H
33 #if 0 /* keep Emacsens' auto-indent happy */
38 #include "gnunet_util_lib.h"
41 * Version number of GNUnet PSYCstore API.
43 #define GNUNET_PSYCSTORE_VERSION 0x00000000
46 * Handle for a PSYCstore
48 struct GNUNET_PSYCSTORE_Handle;
52 * Connect to the PSYCstore service.
54 * @param cfg Configuration to use.
56 * @return Handle for the connecton.
58 struct GNUNET_PSYCSTORE_Handle *
59 GNUNET_PSYCSTORE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg);
63 * Disconnect from the PSYCstore service.
65 * @param h Handle for the connection.
68 GNUNET_PSYCSTORE_disconnect (struct GNUNET_PSYCSTORE_Handle *h);
72 * Handle for an operation on the PSYCSTORE (useful to cancel the operation).
74 struct GNUNET_PSYCSTORE_OperationHandle;
78 * Function called with the result of an asynchronous operation.
80 * @param result #GNUNET_SYSERR on error,
81 * #GNUNET_YES on success or if the peer was a member,
82 * #GNUNET_NO if the peer was not a member
84 typedef void (*GNUNET_PSYCSTORE_ContinuationCallback)(void *cls,
88 * Store join/leave events for a PSYC channel in order to be able to answer
89 * membership test queries later.
91 * @param h Handle for the PSYCstore.
92 * @param channel_id ID of the channel where the event happened.
93 * @param message_id ID of the message in which this event was announced.
94 * @param group_generation Generation of the group when this event was announced.
95 * @param peer Identity of joining/leaving peer.
96 * @param did_join #GNUNET_YES on join, #GNUNET_NO on leave.
97 * @param ccb Callback to call with the result of the storage operation.
98 * @param ccb_cls Closure for the callback.
100 * @return Operation handle that can be used to cancel the operation.
102 struct GNUNET_PSYCSTORE_OperationHandle *
103 GNUNET_PSYCSTORE_membership_store (struct GNUNET_PSYCSTORE_Handle *h,
104 const struct GNUNET_HashCode *channel_id,
106 uint64_t group_generation,
107 const struct GNUNET_PeerIdentity *peer,
109 GNUNET_PSYCSTORE_ContinuationCallback ccb,
114 * Test if a peer was a member of the channel when the message with the
115 * specified ID was sent to the channel.
117 * This is useful in case of retransmissions to check if the peer was authorized
118 * to see the requested message.
120 * @param h Handle for the PSYCstore.
121 * @param channel_id The channel we are interested in.
122 * @param message_id Message ID to check.
123 * @param peer Peer whose membership to check.
124 * @param ccb Callback to call with the test result.
125 * @param ccb_cls Closure for the callback.
127 * @return Operation handle that can be used to cancel the operation.
129 struct GNUNET_PSYCSTORE_OperationHandle *
130 GNUNET_PSYCSTORE_membership_test (struct GNUNET_PSYCSTORE_Handle *h,
131 const struct GNUNET_HashCode *channel_id,
133 const struct GNUNET_PeerIdentity *peer,
134 GNUNET_PSYCSTORE_ContinuationCallback ccb,
139 * Store a message sent to a channel.
141 * @param h Handle for the PSYCstore.
142 * @param channel_id The channel the message belongs to.
143 * @param message Message to store.
144 * @param ccb Callback to call with the result of the operation.
145 * @param ccb_cls Closure for the callback.
147 * @return Handle that can be used to cancel the operation.
149 struct GNUNET_PSYCSTORE_OperationHandle *
150 GNUNET_PSYCSTORE_message_store (struct GNUNET_PSYCSTORE_Handle *h,
151 const struct GNUNET_HashCode *channel_id,
152 const struct GNUNET_MULTICAST_MessageHeader *message,
153 GNUNET_PSYCSTORE_ContinuationCallback ccb,
158 * Function called with the result of a GNUNET_PSYCSTORE_message_get() call.
160 * @param cls Closure.
161 * @param message_id ID of the message.
162 * @param message The retrieved message.
164 typedef void (*GNUNET_PSYCSTORE_MessageResultCallback)(void *cls,
166 const struct GNUNET_MULTICAST_MessageHeader *message);
170 * Retrieve a message by ID.
172 * @param h Handle for the PSYCstore.
173 * @param channel_id The channel we are interested in.
174 * @param message_id Message ID to check. Use 0 to get the latest message.
175 * @param rcb Callback to call with the result of the operation.
176 * @param rcb_cls Closure for the callback.
178 * @return Handle that can be used to cancel the operation.
180 struct GNUNET_PSYCSTORE_OperationHandle *
181 GNUNET_PSYCSTORE_message_get (struct GNUNET_PSYCSTORE_Handle *h,
182 const struct GNUNET_HashCode *channel_id,
184 GNUNET_PSYCSTORE_MessageResultCallback rcb,
189 * Store a state variable.
191 * @param h Handle for the PSYCstore.
192 * @param channel_id The channel we are interested in.
193 * @param name Name of variable.
194 * @param size Size of @a value.
195 * @param value Value of variable.
196 * @param ccb Callback to call with the result of the operation.
197 * @param ccb_cls Closure for the callback.
199 * @return Handle that can be used to cancel the operation.
201 struct GNUNET_PSYCSTORE_OperationHandle *
202 GNUNET_PSYCSTORE_state_set (struct GNUNET_PSYCSTORE_Handle *h,
203 const struct GNUNET_HashCode *channel_id,
207 GNUNET_PSYCSTORE_ContinuationCallback ccb,
212 * Function called with the value of a state variable.
214 * @param cls Closure.
215 * @param name Name of variable.
216 * @param size Size of @a value.
217 * @param value Value of variable.
220 typedef void (*GNUNET_PSYCSTORE_StateResultCallback)(void *cls,
227 * Retrieve the given state variable for a channel.
229 * @param h Handle for the PSYCstore.
230 * @param channel_id The channel we are interested in.
231 * @param name Name of variable to get.
232 * @param rcb Callback to call with the result.
233 * @param rcb_cls Closure for the callback.
235 * @return Handle that can be used to cancel the operation.
237 struct GNUNET_PSYCSTORE_OperationHandle *
238 GNUNET_PSYCSTORE_state_get (struct GNUNET_PSYCSTORE_Handle *h,
239 const struct GNUNET_HashCode *channel_id,
241 GNUNET_PSYCSTORE_StateResultCallback rcb,
246 * Retrieve all state variables for a channel.
248 * @param h Handle for the PSYCstore.
249 * @param channel_id The channel we are interested in.
250 * @param rcb Callback to call with the result.
251 * @param rcb_cls Closure for the callback.
253 * @return Handle that can be used to cancel the operation.
255 struct GNUNET_PSYCSTORE_OperationHandle *
256 GNUNET_PSYCSTORE_state_get_all (struct GNUNET_PSYCSTORE_Handle *h,
257 const struct GNUNET_HashCode *channel_id,
258 GNUNET_PSYCSTORE_StateResultCallback rcb,
263 * Cancel an operation.
265 * @param oh Handle for the operation to cancel.
268 GNUNET_PSYCSTORE_operation_cancel (struct GNUNET_PSYCSTORE_OperationHandle *oh);
273 #if 0 /* keep Emacsens' auto-indent happy */
280 /* ifndef GNUNET_PSYCSTORE_SERVICE_H */
282 /* end of gnunet_psycstore_service.h */