2 This file is part of GNUnet.
3 (C) 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
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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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22 * @file dht/gnunet-service-dht_datacache.c
23 * @brief GNUnet DHT service's datacache integration
24 * @author Christian Grothoff
25 * @author Nathan Evans
28 #include "gnunet_datacache_lib.h"
29 #include "gnunet-service-xdht_clients.h"
30 #include "gnunet-service-xdht_datacache.h"
31 #include "gnunet-service-xdht_routing.h"
32 #include "gnunet-service-xdht_neighbours.h"
33 #include "gnunet-service-dht.h"
35 #define LOG(kind,...) GNUNET_log_from (kind, "dht-dtcache",__VA_ARGS__)
39 * Handle to the datacache service (for inserting/retrieving data)
41 static struct GNUNET_DATACACHE_Handle *datacache;
45 * Handle a datum we've received from another peer. Cache if
48 * @param expiration when will the reply expire
49 * @param key the query this reply is for
50 * @param put_path_length number of peers in 'put_path'
51 * @param put_path path the reply took on put
52 * @param type type of the reply
53 * @param data_size number of bytes in 'data'
54 * @param data application payload data
57 GDS_DATACACHE_handle_put (struct GNUNET_TIME_Absolute expiration,
58 const struct GNUNET_HashCode * key,
59 unsigned int put_path_length,
60 const struct GNUNET_PeerIdentity *put_path,
61 enum GNUNET_BLOCK_Type type, size_t data_size,
66 if (NULL == datacache)
68 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
69 _("%s request received, but have no datacache!\n"), "PUT");
72 if (data_size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
77 /* Put size is actual data size plus struct overhead plus path length (if any) */
78 GNUNET_STATISTICS_update (GDS_stats,
79 gettext_noop ("# ITEMS stored in datacache"), 1,
82 r = GNUNET_DATACACHE_put (datacache, key, data_size, data, type, expiration,
83 put_path_length, put_path);
84 LOG (GNUNET_ERROR_TYPE_DEBUG,
85 "DATACACHE PUT for key %s [%u] completed (%d) after %u hops\n",
86 GNUNET_h2s (key), data_size, r, put_path_length);
90 * List of peers in the get path.
95 * Pointer to next item in the list
100 * Pointer to previous item in the list
102 struct GetPath *prev;
105 * An element in the get path.
107 struct GNUNET_PeerIdentity peer;
112 * Context containing information about a GET request.
114 struct GetRequestContext
117 * extended query (see gnunet_block_lib.h).
122 * Bloomfilter to filter out duplicate replies (updated)
124 struct GNUNET_CONTAINER_BloomFilter **reply_bf;
127 * The key this request was about
129 struct GNUNET_HashCode key;
132 * Number of bytes in xquery.
137 * Mutator value for the reply_bf, see gnunet_block_lib.h
139 uint32_t reply_bf_mutator;
142 * Total number of peers in get path.
144 unsigned int get_path_length;
147 * Return value to give back.
149 enum GNUNET_BLOCK_EvaluationResult eval;
152 * Peeer which has the data for the key.
154 struct GNUNET_PeerIdentity source_peer;
157 * Next hop to forward the get result to.
159 struct GNUNET_PeerIdentity next_hop;
164 struct GetPath *head;
169 struct GetPath *tail;
176 * Iterator for local get request results,
178 * @param cls closure for iterator, a DatacacheGetContext
179 * @param exp when does this value expire?
180 * @param key the key this data is stored under
181 * @param size the size of the data identified by key
182 * @param data the actual data
183 * @param type the type of the data
184 * @param put_path_length number of peers in 'put_path'
185 * @param put_path path the reply took on put
186 * @return GNUNET_OK to continue iteration, anything else
190 datacache_get_iterator (void *cls,
191 const struct GNUNET_HashCode * key, size_t size,
192 const char *data, enum GNUNET_BLOCK_Type type,
193 struct GNUNET_TIME_Absolute exp,
194 unsigned int put_path_length,
195 const struct GNUNET_PeerIdentity *put_path)
197 struct GetRequestContext *ctx = cls;
198 enum GNUNET_BLOCK_EvaluationResult eval;
201 GNUNET_BLOCK_evaluate (GDS_block_context, type, key, ctx->reply_bf,
202 ctx->reply_bf_mutator, ctx->xquery,
203 ctx->xquery_size, data, size);
204 LOG (GNUNET_ERROR_TYPE_DEBUG,
205 "Found reply for query %s in datacache, evaluation result is %d\n",
206 GNUNET_h2s (key), (int) eval);
211 case GNUNET_BLOCK_EVALUATION_OK_MORE:
212 case GNUNET_BLOCK_EVALUATION_OK_LAST:
213 /* forward to local clients */
214 GNUNET_STATISTICS_update (GDS_stats,
216 ("# Good RESULTS found in datacache"), 1,
218 struct GNUNET_PeerIdentity *get_path;
219 get_path = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity) *
220 ctx->get_path_length);
221 struct GetPath *iterator;
222 iterator = ctx->head;
224 while (i < ctx->get_path_length)
226 get_path[i] = iterator->peer;
228 iterator = iterator->next;
231 GDS_NEIGHBOURS_send_get_result (key,type, &(ctx->next_hop),&(ctx->source_peer),
232 put_path_length, put_path, ctx->get_path_length,
233 get_path, exp, data, size );
234 GNUNET_free_non_null (get_path);
237 case GNUNET_BLOCK_EVALUATION_OK_DUPLICATE:
238 GNUNET_STATISTICS_update (GDS_stats,
240 ("# Duplicate RESULTS found in datacache"), 1,
243 case GNUNET_BLOCK_EVALUATION_RESULT_INVALID:
244 GNUNET_STATISTICS_update (GDS_stats,
246 ("# Invalid RESULTS found in datacache"), 1,
249 case GNUNET_BLOCK_EVALUATION_RESULT_IRRELEVANT:
250 GNUNET_STATISTICS_update (GDS_stats,
252 ("# Irrelevant RESULTS found in datacache"), 1,
255 case GNUNET_BLOCK_EVALUATION_REQUEST_VALID:
258 case GNUNET_BLOCK_EVALUATION_REQUEST_INVALID:
260 return GNUNET_SYSERR;
261 case GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED:
262 GNUNET_STATISTICS_update (GDS_stats,
264 ("# Unsupported RESULTS found in datacache"), 1,
266 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
267 _("Unsupported block type (%u) in local response!\n"), type);
271 return (eval == GNUNET_BLOCK_EVALUATION_OK_LAST) ? GNUNET_NO : GNUNET_OK;
276 * Handle a GET request we've received from another peer.
278 * @param key the query
279 * @param type requested data type
280 * @param xquery extended query
281 * @param xquery_size number of bytes in xquery
282 * @param reply_bf where the reply bf is (to be) stored, possibly updated, can be NULL
283 * @param reply_bf_mutator mutation value for reply_bf
284 * @return evaluation result for the local replies
285 * @get_path_length Total number of peers in get path
286 * @get_path Peers in get path.
288 enum GNUNET_BLOCK_EvaluationResult
289 GDS_DATACACHE_handle_get (const struct GNUNET_HashCode * key,
290 enum GNUNET_BLOCK_Type type, const void *xquery,
292 struct GNUNET_CONTAINER_BloomFilter **reply_bf,
293 uint32_t reply_bf_mutator,
294 uint32_t get_path_length,
295 struct GNUNET_PeerIdentity *get_path,
296 struct GNUNET_PeerIdentity *next_hop,
297 struct GNUNET_PeerIdentity *source_peer)
299 struct GetRequestContext ctx;
302 if (datacache == NULL)
303 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
304 GNUNET_STATISTICS_update (GDS_stats,
305 gettext_noop ("# GET requests given to datacache"),
307 ctx.eval = GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
310 ctx.xquery_size = xquery_size;
311 ctx.reply_bf = reply_bf;
312 ctx.reply_bf_mutator = reply_bf_mutator;
313 ctx.get_path_length = get_path_length;
315 if (next_hop != NULL)
317 memcpy (&(ctx.next_hop), next_hop, sizeof (struct GNUNET_PeerIdentity));
323 if (get_path != NULL)
325 while (i < get_path_length)
327 struct GetPath *element;
328 element = GNUNET_new (struct GetPath);
329 element->next = NULL;
330 element->prev = NULL;
331 element->peer = get_path[i];
332 GNUNET_CONTAINER_DLL_insert_tail (ctx.head, ctx.tail, element);
337 r = GNUNET_DATACACHE_get (datacache, key, type, &datacache_get_iterator,
339 LOG (GNUNET_ERROR_TYPE_DEBUG,
340 "DATACACHE GET for key %s completed (%d). %u results found.\n",
341 GNUNET_h2s (key), ctx.eval, r);
347 * Initialize datacache subsystem.
350 GDS_DATACACHE_init ()
352 datacache = GNUNET_DATACACHE_create (GDS_cfg, "dhtcache");
357 * Shutdown datacache subsystem.
360 GDS_DATACACHE_done ()
362 if (datacache != NULL)
364 GNUNET_DATACACHE_destroy (datacache);
370 /* end of gnunet-service-dht_datacache.c */