2 This file is part of GNUnet
3 (C) 2009 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 2, or (at your
8 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 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file datastore/plugin_datastore_template.c
23 * @brief template-based datastore backend
24 * @author Christian Grothoff
28 #include "plugin_datastore.h"
32 * Context for all functions in this plugin.
37 * Our execution environment.
39 struct GNUNET_DATASTORE_PluginEnvironment *env;
44 * Get an estimate of how much space the database is
46 * @return number of bytes used on disk
48 static unsigned long long template_plugin_get_size (void *cls)
55 * Store an item in the datastore.
58 * @param key key for the item
59 * @param size number of bytes in data
60 * @param data content stored
61 * @param type type of the content
62 * @param priority priority of the content
63 * @param anonymity anonymity-level for the content
64 * @param expiration expiration time for the content
65 * @param msg set to error message
66 * @return GNUNET_OK on success
69 template_plugin_put (void *cls,
70 const GNUNET_HashCode * key,
76 struct GNUNET_TIME_Absolute expiration,
79 *msg = GNUNET_strdup ("not implemented");
85 * Iterate over the results for a particular key
89 * @param key maybe NULL (to match all entries)
90 * @param vhash hash of the value, maybe NULL (to
91 * match all values that have the right key).
92 * Note that for DBlocks there is no difference
93 * betwen key and vhash, but for other blocks
95 * @param type entries of which type are relevant?
97 * @param iter function to call on each matching value;
98 * will be called once with a NULL value at the end
99 * @param iter_cls closure for iter
102 template_plugin_get (void *cls,
103 const GNUNET_HashCode * key,
104 const GNUNET_HashCode * vhash,
106 GNUNET_DATASTORE_Iterator iter, void *iter_cls)
112 * Update the priority for a particular key in the datastore. If
113 * the expiration time in value is different than the time found in
114 * the datastore, the higher value should be kept. For the
115 * anonymity level, the lower value is to be used. The specified
116 * priority should be added to the existing priority, ignoring the
119 * Note that it is possible for multiple values to match this put.
120 * In that case, all of the respective values are updated.
122 * @param uid unique identifier of the datum
123 * @param delta by how much should the priority
124 * change? If priority + delta < 0 the
125 * priority should be set to 0 (never go
127 * @param expire new expiration time should be the
128 * MAX of any existing expiration time and
130 * @param msg set to error message
131 * @return GNUNET_OK on success
134 template_plugin_update (void *cls,
135 unsigned long long uid,
136 int delta, struct GNUNET_TIME_Absolute expire,
139 *msg = GNUNET_strdup ("not implemented");
140 return GNUNET_SYSERR;
145 * Select a subset of the items in the datastore and call
146 * the given iterator for each of them.
148 * @param type entries of which type should be considered?
149 * Use 0 for any type.
150 * @param iter function to call on each matching value;
151 * will be called once with a NULL value at the end
152 * @param iter_cls closure for iter
155 template_plugin_iter_low_priority (void *cls,
157 GNUNET_DATASTORE_Iterator iter,
165 * Select a subset of the items in the datastore and call
166 * the given iterator for each of them.
168 * @param type entries of which type should be considered?
169 * Use 0 for any type.
170 * @param iter function to call on each matching value;
171 * will be called once with a NULL value at the end
172 * @param iter_cls closure for iter
175 template_plugin_iter_zero_anonymity (void *cls,
177 GNUNET_DATASTORE_Iterator iter,
185 * Select a subset of the items in the datastore and call
186 * the given iterator for each of them.
188 * @param type entries of which type should be considered?
189 * Use 0 for any type.
190 * @param iter function to call on each matching value;
191 * will be called once with a NULL value at the end
192 * @param iter_cls closure for iter
195 template_plugin_iter_ascending_expiration (void *cls,
197 GNUNET_DATASTORE_Iterator iter,
205 * Select a subset of the items in the datastore and call
206 * the given iterator for each of them.
208 * @param type entries of which type should be considered?
209 * Use 0 for any type.
210 * @param iter function to call on each matching value;
211 * will be called once with a NULL value at the end
212 * @param iter_cls closure for iter
215 template_plugin_iter_migration_order (void *cls,
217 GNUNET_DATASTORE_Iterator iter,
225 * Select a subset of the items in the datastore and call
226 * the given iterator for each of them.
228 * @param type entries of which type should be considered?
229 * Use 0 for any type.
230 * @param iter function to call on each matching value;
231 * will be called once with a NULL value at the end
232 * @param iter_cls closure for iter
235 template_plugin_iter_all_now (void *cls,
237 GNUNET_DATASTORE_Iterator iter,
247 template_plugin_drop (void *cls)
253 * Entry point for the plugin.
256 libgnunet_plugin_datastore_template_init (void *cls)
258 struct GNUNET_DATASTORE_PluginEnvironment *env = cls;
259 struct GNUNET_DATASTORE_PluginFunctions *api;
260 struct Plugin *plugin;
262 plugin = GNUNET_malloc (sizeof (struct Plugin));
264 api = GNUNET_malloc (sizeof (struct GNUNET_DATASTORE_PluginFunctions));
266 api->get_size = &template_plugin_get_size;
267 api->put = &template_plugin_put;
268 api->get = &template_plugin_get;
269 api->update = &template_plugin_update;
270 api->iter_low_priority = &template_plugin_iter_low_priority;
271 api->iter_zero_anonymity = &template_plugin_iter_zero_anonymity;
272 api->iter_ascending_expiration = &template_plugin_iter_ascending_expiration;
273 api->iter_migration_order = &template_plugin_iter_migration_order;
274 api->iter_all_now = &template_plugin_iter_all_now;
275 api->drop = &template_plugin_drop;
276 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO,
277 "template", _("Template database running\n"));
283 * Exit point from the plugin.
286 libgnunet_plugin_datastore_template_done (void *cls)
288 struct GNUNET_DATASTORE_PluginFunctions *api = cls;
289 struct Plugin *plugin = api->cls;
291 GNUNET_free (plugin);
296 /* end of plugin_datastore_template.c */