2 This file is part of GNUnet
3 (C) 2013 Christian Grothoff (and other contributing authors)
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22 * @file include/gnunet_set_service.h
23 * @brief two-peer set operations
24 * @author Florian Dold
27 #ifndef GNUNET_SET_SERVICE_H
28 #define GNUNET_SET_SERVICE_H
33 #if 0 /* keep Emacsens' auto-indent happy */
39 #include "gnunet_common.h"
40 #include "gnunet_time_lib.h"
41 #include "gnunet_configuration_lib.h"
45 * Opaque handle to a set.
47 struct GNUNET_SET_Handle;
50 * Opaque handle to a set operation request from another peer.
52 struct GNUNET_SET_Request;
55 * Opaque handle to a listen operation.
57 struct GNUNET_SET_ListenHandle;
60 * Opaque handle to a set operation.
62 struct GNUNET_SET_OperationHandle;
66 * The operation that a set set supports.
68 enum GNUNET_SET_OperationType
71 * Set intersection, only return elements that are in both sets.
73 GNUNET_SET_OPERATION_INTERSECTION,
75 * Set union, return all elements that are in at least one of the sets.
77 GNUNET_SET_OPERATION_UNION
81 * Status for the result callback
83 enum GNUNET_SET_Status
90 * There was a timeout.
92 GNUNET_SET_STATUS_TIMEOUT,
94 * The other peer refused to to the operation with us
96 GNUNET_SET_STATUS_REFUSED,
98 * Success, all elements have been sent.
100 GNUNET_SET_STATUS_DONE
104 * The way results are given to the client.
106 enum GNUNET_SET_ResultMode
109 * Client gets every element in the resulting set.
111 GNUNET_SET_RESULT_FULL,
113 * Client gets only elements that have been added to the set.
114 * Only works with set union.
116 GNUNET_SET_RESULT_ADDED,
118 * Client gets only elements that have been removed from the set.
119 * Only works with set intersection.
121 GNUNET_SET_RESULT_REMOVED
125 * Element stored in a set.
127 struct GNUNET_SET_Element
130 * Number of bytes in the buffer pointed to by data.
135 * Application-specific element type.
140 * Actual data of the element
147 * Continuation used for some of the set operations
151 typedef void (*GNUNET_SET_Continuation) (void *cls);
155 * Callback for set operation results. Called for each element
159 * @param element a result element, only valid if status is GNUNET_SET_STATUS_OK
160 * @param status see enum GNUNET_SET_Status
162 typedef void (*GNUNET_SET_ResultIterator) (void *cls,
163 struct GNUNET_SET_Element *element,
164 enum GNUNET_SET_Status status);
168 * Called when another peer wants to do a set operation with the
171 * @param other_peer the other peer
172 * @param context_msg message with application specific information from
174 * @param request request from the other peer, use GNUNET_SET_accept
175 * to accept it, otherwise the request will be refused
176 * Note that we don't use a return value here, as it is also
177 * necessary to specify the set we want to do the operation with,
178 * whith sometimes can be derived from the context message.
179 * Also necessary to specify the timeout.
182 (*GNUNET_SET_ListenCallback) (void *cls,
183 const struct GNUNET_PeerIdentity *other_peer,
184 const struct GNUNET_MessageHeader *context_msg,
185 struct GNUNET_SET_Request *request);
190 * Create an empty set, supporting the specified operation.
192 * @param cfg configuration to use for connecting to the
194 * @param op operation supported by the set
195 * Note that the operation has to be specified
196 * beforehand, as certain set operations need to maintain
197 * data structures spefific to the operation
198 * @return a handle to the set
200 struct GNUNET_SET_Handle *
201 GNUNET_SET_create (const struct GNUNET_CONFIGURATION_Handle *cfg,
202 enum GNUNET_SET_OperationType op);
206 * Add an element to the given set.
207 * After the element has been added (in the sense of being
208 * transmitted to the set service), cont will be called.
209 * Calls to add_element can be queued
211 * @param set set to add element to
212 * @param element element to add to the set
213 * @param cont continuation called after the element has been added
214 * @param cont_cls closure for cont
217 GNUNET_SET_add_element (struct GNUNET_SET_Handle *set,
218 const struct GNUNET_SET_Element *element,
219 GNUNET_SET_Continuation cont,
224 * Remove an element to the given set.
225 * After the element has been removed (in the sense of the
226 * request being transmitted to the set service), cont will be called.
227 * Calls to remove_element can be queued
229 * @param set set to remove element from
230 * @param element element to remove from the set
231 * @param cont continuation called after the element has been removed
232 * @param cont_cls closure for cont
235 GNUNET_SET_remove_element (struct GNUNET_SET_Handle *set,
236 const struct GNUNET_SET_Element *element,
237 GNUNET_SET_Continuation cont,
242 * Destroy the set handle, and free all associated resources.
245 GNUNET_SET_destroy (struct GNUNET_SET_Handle *set);
249 * Evaluate a set operation with our set and the set of another peer.
251 * @param set set to use
252 * @param salt salt for HKDF (explain more here)
253 * @param other_peer peer with the other set
254 * @param app_id hash for the application using the set
255 * @param context_msg additional information for the request
256 * @param result_cb called on error or success
257 * @param result_cls closure for result_cb
258 * @return a handle to cancel the operation
260 struct GNUNET_SET_OperationHandle *
261 GNUNET_SET_evaluate (struct GNUNET_SET_Handle *set,
262 const struct GNUNET_PeerIdentity *other_peer,
263 const struct GNUNET_HashCode *app_id,
264 const struct GNUNET_MessageHeader *context_msg,
265 struct GNUNET_TIME_Relative timeout,
266 enum GNUNET_SET_ResultMode result_mode,
267 GNUNET_SET_ResultIterator result_cb,
272 * Wait for set operation requests for the given application id
274 * @param cfg configuration to use for connecting to
276 * @param operation operation we want to listen for
277 * @param app_id id of the application that handles set operation requests
278 * @param listen_cb called for each incoming request matching the operation
280 * @param listen_cls handle for listen_cb
281 * @return a handle that can be used to cancel the listen operation
283 struct GNUNET_SET_ListenHandle *
284 GNUNET_SET_listen (const struct GNUNET_CONFIGURATION_Handle *cfg,
285 enum GNUNET_SET_OperationType op_type,
286 const struct GNUNET_HashCode *app_id,
287 GNUNET_SET_ListenCallback listen_cb,
293 * Cancel the given listen operation.
295 * @param lh handle for the listen operation
298 GNUNET_SET_listen_cancel (struct GNUNET_SET_ListenHandle *lh);
302 * Accept a request we got via GNUNET_SET_listen
304 * @param request request to accept
305 * @param set set used for the requested operation
306 * @param timeout timeout for the set operation
307 * @param result_cb callback for the results
308 * @param cls closure for result_cb
310 struct GNUNET_SET_OperationHandle *
311 GNUNET_SET_accept (struct GNUNET_SET_Request *request,
312 struct GNUNET_SET_Handle *set,
313 struct GNUNET_TIME_Relative timeout,
314 enum GNUNET_SET_ResultMode result_mode,
315 GNUNET_SET_ResultIterator result_cb,
320 * Cancel the given set operation.
322 * @param op set operation to cancel
325 GNUNET_SET_operation_cancel (struct GNUNET_SET_OperationHandle *oh);
328 #if 0 /* keep Emacsens' auto-indent happy */