2 This file is part of GNUnet.
3 Copyright (C) 2009, 2010, 2011 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
8 option) any later version.
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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.
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 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-wdht_clients.h"
30 #include "gnunet-service-wdht_datacache.h"
31 #include "gnunet-service-wdht_neighbours.h"
32 #include "gnunet-service-dht.h"
34 #define LOG(kind,...) GNUNET_log_from (kind, "dht-dtcache",__VA_ARGS__)
37 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
40 * Handle to the datacache service (for inserting/retrieving data)
42 static struct GNUNET_DATACACHE_Handle *datacache;
46 * Handle a datum we've received from another peer. Cache if
49 * @param expiration when will the reply expire
50 * @param key the query this reply is for
51 * @param put_path_length number of peers in 'put_path'
52 * @param put_path path the reply took on put
53 * @param type type of the reply
54 * @param data_size number of bytes in 'data'
55 * @param data application payload data
58 GDS_DATACACHE_handle_put (struct GNUNET_TIME_Absolute expiration,
59 const struct GNUNET_HashCode * key,
60 unsigned int put_path_length,
61 const struct GNUNET_PeerIdentity *put_path,
62 enum GNUNET_BLOCK_Type type, size_t data_size,
67 if (NULL == datacache)
69 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
70 _("%s request received, but have no datacache!\n"), "PUT");
73 if (data_size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
79 /* Put size is actual data size plus struct overhead plus path length (if any) */
80 GNUNET_STATISTICS_update (GDS_stats,
81 gettext_noop ("# ITEMS stored in datacache"), 1,
84 struct GNUNET_PeerIdentity peer = GDS_NEIGHBOURS_get_my_id();
85 DEBUG("DATACACHE_PUT KEY = %s, peer = %s\n",GNUNET_h2s(key),GNUNET_i2s(&peer));
86 r = GNUNET_DATACACHE_put (datacache, key, data_size, data, type, expiration,
87 put_path_length, put_path);
88 LOG (GNUNET_ERROR_TYPE_DEBUG,
89 "DATACACHE PUT for key %s [%u] completed (%d) after %u hops\n",
90 GNUNET_h2s (key), data_size, r, put_path_length);
94 * List of peers in the get path.
99 * Pointer to next item in the list
101 struct GetPath *next;
104 * Pointer to previous item in the list
106 struct GetPath *prev;
109 * An element in the get path.
111 struct GNUNET_PeerIdentity peer;
116 * Context containing information about a GET request.
118 struct GetRequestContext
121 * extended query (see gnunet_block_lib.h).
126 * Bloomfilter to filter out duplicate replies (updated)
128 struct GNUNET_CONTAINER_BloomFilter **reply_bf;
131 * The key this request was about
133 struct GNUNET_HashCode key;
136 * Number of bytes in xquery.
141 * Mutator value for the reply_bf, see gnunet_block_lib.h
143 uint32_t reply_bf_mutator;
146 * Total number of peers in get path.
148 unsigned int get_path_length;
151 * Return value to give back.
153 enum GNUNET_BLOCK_EvaluationResult eval;
156 * Peeer which has the data for the key.
158 struct GNUNET_PeerIdentity source_peer;
161 * Next hop to forward the get result to.
163 struct GNUNET_PeerIdentity next_hop;
168 struct GetPath *head;
173 struct GetPath *tail;
180 * Iterator for local get request results,
182 * @param cls closure for iterator, a `struct GetRequestContext`
183 * @param key the key this data is stored under
184 * @param size the size of the data identified by key
185 * @param data the actual data
186 * @param type the type of the data
187 * @param exp when does this value expire?
188 * @param put_path_length number of peers in @a put_path
189 * @param put_path path the reply took on put
190 * @return #GNUNET_OK to continue iteration, anything else
194 datacache_get_iterator (void *cls,
195 const struct GNUNET_HashCode *key,
198 enum GNUNET_BLOCK_Type type,
199 struct GNUNET_TIME_Absolute exp,
200 unsigned int put_path_length,
201 const struct GNUNET_PeerIdentity *put_path)
203 struct GetRequestContext *ctx = cls;
204 enum GNUNET_BLOCK_EvaluationResult eval;
207 GNUNET_BLOCK_evaluate (GDS_block_context,
209 GNUNET_BLOCK_EO_NONE,
212 ctx->reply_bf_mutator,
217 LOG (GNUNET_ERROR_TYPE_DEBUG,
218 "Found reply for query %s in datacache, evaluation result is %d\n",
219 GNUNET_h2s (key), (int) eval);
224 case GNUNET_BLOCK_EVALUATION_OK_MORE:
225 case GNUNET_BLOCK_EVALUATION_OK_LAST:
226 /* forward to local clients */
227 GNUNET_STATISTICS_update (GDS_stats,
229 ("# Good RESULTS found in datacache"), 1,
231 struct GNUNET_PeerIdentity *get_path;
232 get_path = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity) *
233 ctx->get_path_length);
234 struct GetPath *iterator;
235 iterator = ctx->head;
237 while (i < ctx->get_path_length)
239 get_path[i] = iterator->peer;
241 iterator = iterator->next;
243 GDS_NEIGHBOURS_send_get_result (key,type, &(ctx->next_hop),&(ctx->source_peer),
244 put_path_length, put_path, ctx->get_path_length,
245 get_path, exp, data, size );
246 GNUNET_free_non_null (get_path);
249 case GNUNET_BLOCK_EVALUATION_OK_DUPLICATE:
250 GNUNET_STATISTICS_update (GDS_stats,
252 ("# Duplicate RESULTS found in datacache"), 1,
255 case GNUNET_BLOCK_EVALUATION_RESULT_INVALID:
256 GNUNET_STATISTICS_update (GDS_stats,
258 ("# Invalid RESULTS found in datacache"), 1,
261 case GNUNET_BLOCK_EVALUATION_RESULT_IRRELEVANT:
262 GNUNET_STATISTICS_update (GDS_stats,
264 ("# Irrelevant RESULTS found in datacache"), 1,
267 case GNUNET_BLOCK_EVALUATION_REQUEST_VALID:
270 case GNUNET_BLOCK_EVALUATION_REQUEST_INVALID:
272 return GNUNET_SYSERR;
273 case GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED:
274 GNUNET_STATISTICS_update (GDS_stats,
276 ("# Unsupported RESULTS found in datacache"), 1,
278 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
279 _("Unsupported block type (%u) in local response!\n"), type);
283 return (eval == GNUNET_BLOCK_EVALUATION_OK_LAST) ? GNUNET_NO : GNUNET_OK;
288 * Handle a GET request we've received from another peer.
290 * @param key the query
291 * @param type requested data type
292 * @param xquery extended query
293 * @param xquery_size number of bytes in xquery
294 * @param reply_bf where the reply bf is (to be) stored, possibly updated, can be NULL
295 * @param reply_bf_mutator mutation value for reply_bf
296 * @return evaluation result for the local replies
297 * @get_path_length Total number of peers in get path
298 * @get_path Peers in get path.
300 enum GNUNET_BLOCK_EvaluationResult
301 GDS_DATACACHE_handle_get (const struct GNUNET_HashCode * key,
302 enum GNUNET_BLOCK_Type type, const void *xquery,
304 struct GNUNET_CONTAINER_BloomFilter **reply_bf,
305 uint32_t reply_bf_mutator,
306 uint32_t get_path_length,
307 struct GNUNET_PeerIdentity *get_path,
308 struct GNUNET_PeerIdentity *next_hop,
309 struct GNUNET_PeerIdentity *source_peer)
311 struct GetRequestContext ctx;
314 if (datacache == NULL)
315 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
316 GNUNET_STATISTICS_update (GDS_stats,
317 gettext_noop ("# GET requests given to datacache"),
319 ctx.eval = GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
322 ctx.xquery_size = xquery_size;
323 ctx.reply_bf = reply_bf;
324 ctx.reply_bf_mutator = reply_bf_mutator;
325 ctx.get_path_length = get_path_length;
327 if (next_hop != NULL)
329 memcpy (&(ctx.next_hop), next_hop, sizeof (struct GNUNET_PeerIdentity));
335 if (get_path != NULL)
337 while (i < get_path_length)
339 struct GetPath *element;
340 element = GNUNET_new (struct GetPath);
341 element->next = NULL;
342 element->prev = NULL;
343 element->peer = get_path[i];
344 GNUNET_CONTAINER_DLL_insert_tail (ctx.head, ctx.tail, element);
349 r = GNUNET_DATACACHE_get (datacache, key, type, &datacache_get_iterator,
351 DEBUG ("DATACACHE_GET for key %s completed (%d). %u results found.\n",GNUNET_h2s (key), ctx.eval, r);
357 * Initialize datacache subsystem.
360 GDS_DATACACHE_init ()
362 datacache = GNUNET_DATACACHE_create (GDS_cfg, "dhtcache");
367 * Shutdown datacache subsystem.
370 GDS_DATACACHE_done ()
372 if (datacache != NULL)
374 GNUNET_DATACACHE_destroy (datacache);
380 /* end of gnunet-service-dht_datacache.c */