2 This file is part of GNUnet
3 (C) 2013 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 * @file set/gnunet-service-set.h
23 * @brief common components for the implementation the different set operations
24 * @author Florian Dold
27 #ifndef GNUNET_SERVICE_SET_H_PRIVATE
28 #define GNUNET_SERVICE_SET_H_PRIVATE
31 #include "gnunet_util_lib.h"
32 #include "gnunet_protocols.h"
33 #include "gnunet_applications.h"
34 #include "gnunet_core_service.h"
35 #include "gnunet_mesh_service.h"
36 #include "gnunet_set_service.h"
41 * Implementation-specific set state.
42 * Used as opaque pointer, and specified further
43 * in the respective implementation.
49 * Implementation-specific set operation.
50 * Used as opaque pointer, and specified further
51 * in the respective implementation.
53 struct OperationState;
56 /* forward declarations */
63 * Detail information about an operation.
65 struct OperationSpecification
68 * The type of the operation.
70 enum GNUNET_SET_OperationType operation;
73 * The remove peer we evaluate the operation with
75 struct GNUNET_PeerIdentity peer;
78 * Application ID for the operation, used to distinguish
79 * multiple operations of the same type with the same peer.
81 struct GNUNET_HashCode app_id;
84 * Context message, may be NULL.
86 struct GNUNET_MessageHeader *context_msg;
89 * Salt to use for the operation.
94 * ID used to identify responses to a client.
96 uint32_t client_request_id;
99 * Set associated with the operation, NULL until the spec has been associated
109 * Signature of functions that create the implementation-specific
110 * state for a set supporting a specific operation.
112 * @return a set state specific to the supported operation
114 typedef struct SetState *(*CreateImpl) (void);
118 * Signature of functions that implement the add/remove functionality
119 * for a set supporting a specific operation.
121 * @param set implementation-specific set state
122 * @param msg element message from the client
124 typedef void (*AddRemoveImpl) (struct SetState *state, struct ElementEntry *ee);
128 * Signature of functions that handle disconnection
129 * of the remote peer.
131 * @param op the set operation, contains implementation-specific data
133 typedef void (*PeerDisconnectImpl) (struct OperationState *op);
137 * Signature of functions that implement the destruction of the
138 * implementation-specific set state.
140 * @param state the set state, contains implementation-specific data
142 typedef void (*DestroySetImpl) (struct SetState *state);
146 * Signature of functions that implement the creation of set operations
147 * (currently evaluate and accept).
149 * @param spec specification of the set operation to be created
150 * @param tunnel the tunnel with the other peer
151 * @param tc tunnel context
153 typedef void (*OpCreateImpl) (struct OperationSpecification *spec,
154 struct GNUNET_MESH_Tunnel *tunnel,
155 struct TunnelContext *tc);
159 * Signature of functions that implement the message handling for
160 * the different set operations.
162 * @param op operation state
163 * @param msg received message
164 * @return GNUNET_OK on success, GNUNET_SYSERR to
165 * destroy the operation and the tunnel
167 typedef int (*MsgHandlerImpl) (struct OperationState *op,
168 const struct GNUNET_MessageHeader *msg);
170 typedef void (*CancelImpl) (struct SetState *set,
171 uint32_t request_id);
175 * Signature of functions that implement sending all the set's
176 * elements to the client.
178 * @param set set that should be iterated over
180 typedef void (*IterateImpl) (struct Set *set);
184 * Dispatch table for a specific set operation.
185 * Every set operation has to implement the callback
191 * Callback for the set creation.
196 * Callback for element insertion
201 * Callback for element removal.
203 AddRemoveImpl remove;
206 * Callback for accepting a set operation request
211 * Callback for starting evaluation with a remote peer.
213 OpCreateImpl evaluate;
216 * Callback for destruction of the set state.
218 DestroySetImpl destroy_set;
221 * Callback for handling operation-specific messages.
223 MsgHandlerImpl msg_handler;
226 * Callback for handling the remote peer's
229 PeerDisconnectImpl peer_disconnect;
232 * Callback for canceling an operation by
238 * Callback for iterating over all set elements.
245 * Information about an element element in the set.
246 * All elements are stored in a hash-table
247 * from their hash-code to their 'struct Element',
248 * so that the remove and add operations are reasonably
254 * The actual element. The data for the element
255 * should be allocated at the end of this struct.
257 struct GNUNET_SET_Element element;
260 * Hash of the element.
261 * Will be used to derive the different IBF keys
262 * for different salts.
264 struct GNUNET_HashCode element_hash;
267 * Generation the element was added by the client.
268 * Operations of earlier generations will not consider the element.
270 unsigned int generation_added;
273 * GNUNET_YES if the element has been removed in some generation.
278 * Generation the element was removed by the client.
279 * Operations of later generations will not consider the element.
280 * Only valid if is_removed is GNUNET_YES.
282 unsigned int generation_removed;
285 * GNUNET_YES if the element is a remote element, and does not belong
286 * to the operation's set.
293 * A set that supports a specific operation
299 * Client that owns the set.
300 * Only one client may own a set.
302 struct GNUNET_SERVER_Client *client;
305 * Message queue for the client
307 struct GNUNET_MQ_Handle *client_mq;
310 * Type of operation supported for this set
312 enum GNUNET_SET_OperationType operation;
315 * Virtual table for this set.
316 * Determined by the operation type of this set.
318 const struct SetVT *vt;
321 * Sets are held in a doubly linked list.
326 * Sets are held in a doubly linked list.
331 * Implementation-specific state.
333 struct SetState *state;
336 * Current state of iterating elements for the client.
337 * NULL if we are not currently iterating.
339 struct GNUNET_CONTAINER_MultiHashMapIterator *iter;
342 * Maps 'struct GNUNET_HashCode' to 'struct ElementEntry'.
344 struct GNUNET_CONTAINER_MultiHashMap *elements;
347 * Current generation, that is, number of
348 * previously executed operations on this set
350 unsigned int current_generation;
355 * Information about a tunnel we are connected to.
356 * Used as tunnel context with mesh.
361 * V-Table for the operation belonging
362 * to the tunnel contest.
364 const struct SetVT *vt;
367 * Implementation-specific operation state.
369 struct OperationState *op;
374 * Get the table with implementing functions for
378 _GSS_union_vt (void);