aboutsummaryrefslogtreecommitdiff
path: root/src/dht/gnunet-service-wdht_datacache.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/dht/gnunet-service-wdht_datacache.c')
-rw-r--r--src/dht/gnunet-service-wdht_datacache.c381
1 files changed, 381 insertions, 0 deletions
diff --git a/src/dht/gnunet-service-wdht_datacache.c b/src/dht/gnunet-service-wdht_datacache.c
new file mode 100644
index 000000000..571342f36
--- /dev/null
+++ b/src/dht/gnunet-service-wdht_datacache.c
@@ -0,0 +1,381 @@
1/*
2 This file is part of GNUnet.
3 Copyright (C) 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
4
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.
9
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.
14
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.
19*/
20
21/**
22 * @file dht/gnunet-service-dht_datacache.c
23 * @brief GNUnet DHT service's datacache integration
24 * @author Christian Grothoff
25 * @author Nathan Evans
26 */
27#include "platform.h"
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_routing.h"
32#include "gnunet-service-wdht_neighbours.h"
33#include "gnunet-service-dht.h"
34
35#define LOG(kind,...) GNUNET_log_from (kind, "dht-dtcache",__VA_ARGS__)
36
37#define DEBUG(...) \
38 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
39
40/**
41 * Handle to the datacache service (for inserting/retrieving data)
42 */
43static struct GNUNET_DATACACHE_Handle *datacache;
44
45
46/**
47 * Handle a datum we've received from another peer. Cache if
48 * possible.
49 *
50 * @param expiration when will the reply expire
51 * @param key the query this reply is for
52 * @param put_path_length number of peers in 'put_path'
53 * @param put_path path the reply took on put
54 * @param type type of the reply
55 * @param data_size number of bytes in 'data'
56 * @param data application payload data
57 */
58void
59GDS_DATACACHE_handle_put (struct GNUNET_TIME_Absolute expiration,
60 const struct GNUNET_HashCode * key,
61 unsigned int put_path_length,
62 const struct GNUNET_PeerIdentity *put_path,
63 enum GNUNET_BLOCK_Type type, size_t data_size,
64 const void *data)
65{
66 int r;
67
68 if (NULL == datacache)
69 {
70 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
71 _("%s request received, but have no datacache!\n"), "PUT");
72 return;
73 }
74 if (data_size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
75 {
76 GNUNET_break (0);
77 return;
78 }
79
80 /* Put size is actual data size plus struct overhead plus path length (if any) */
81 GNUNET_STATISTICS_update (GDS_stats,
82 gettext_noop ("# ITEMS stored in datacache"), 1,
83 GNUNET_NO);
84
85 struct GNUNET_PeerIdentity peer = GDS_NEIGHBOURS_get_my_id();
86 DEBUG("DATACACHE_PUT KEY = %s, peer = %s\n",GNUNET_h2s(key),GNUNET_i2s(&peer));
87 r = GNUNET_DATACACHE_put (datacache, key, data_size, data, type, expiration,
88 put_path_length, put_path);
89 LOG (GNUNET_ERROR_TYPE_DEBUG,
90 "DATACACHE PUT for key %s [%u] completed (%d) after %u hops\n",
91 GNUNET_h2s (key), data_size, r, put_path_length);
92}
93
94/**
95 * List of peers in the get path.
96 */
97struct GetPath
98{
99 /**
100 * Pointer to next item in the list
101 */
102 struct GetPath *next;
103
104 /**
105 * Pointer to previous item in the list
106 */
107 struct GetPath *prev;
108
109 /**
110 * An element in the get path.
111 */
112 struct GNUNET_PeerIdentity peer;
113};
114
115
116/**
117 * Context containing information about a GET request.
118 */
119struct GetRequestContext
120{
121 /**
122 * extended query (see gnunet_block_lib.h).
123 */
124 const void *xquery;
125
126 /**
127 * Bloomfilter to filter out duplicate replies (updated)
128 */
129 struct GNUNET_CONTAINER_BloomFilter **reply_bf;
130
131 /**
132 * The key this request was about
133 */
134 struct GNUNET_HashCode key;
135
136 /**
137 * Number of bytes in xquery.
138 */
139 size_t xquery_size;
140
141 /**
142 * Mutator value for the reply_bf, see gnunet_block_lib.h
143 */
144 uint32_t reply_bf_mutator;
145
146 /**
147 * Total number of peers in get path.
148 */
149 unsigned int get_path_length;
150
151 /**
152 * Return value to give back.
153 */
154 enum GNUNET_BLOCK_EvaluationResult eval;
155
156 /**
157 * Peeer which has the data for the key.
158 */
159 struct GNUNET_PeerIdentity source_peer;
160
161 /**
162 * Next hop to forward the get result to.
163 */
164 struct GNUNET_PeerIdentity next_hop;
165
166 /**
167 * Head of get path.
168 */
169 struct GetPath *head;
170
171 /**
172 * Tail of get path.
173 */
174 struct GetPath *tail;
175
176 /* get_path */
177};
178
179
180/**
181 * Iterator for local get request results,
182 *
183 * @param cls closure for iterator, a `struct GetRequestContext`
184 * @param key the key this data is stored under
185 * @param size the size of the data identified by key
186 * @param data the actual data
187 * @param type the type of the data
188 * @param exp when does this value expire?
189 * @param put_path_length number of peers in @a put_path
190 * @param put_path path the reply took on put
191 * @return #GNUNET_OK to continue iteration, anything else
192 * to stop iteration.
193 */
194static int
195datacache_get_iterator (void *cls,
196 const struct GNUNET_HashCode *key,
197 size_t size,
198 const char *data,
199 enum GNUNET_BLOCK_Type type,
200 struct GNUNET_TIME_Absolute exp,
201 unsigned int put_path_length,
202 const struct GNUNET_PeerIdentity *put_path)
203{
204 struct GetRequestContext *ctx = cls;
205 enum GNUNET_BLOCK_EvaluationResult eval;
206
207 eval =
208 GNUNET_BLOCK_evaluate (GDS_block_context,
209 type,
210 GNUNET_BLOCK_EO_NONE,
211 key,
212 ctx->reply_bf,
213 ctx->reply_bf_mutator,
214 ctx->xquery,
215 ctx->xquery_size,
216 data,
217 size);
218 LOG (GNUNET_ERROR_TYPE_DEBUG,
219 "Found reply for query %s in datacache, evaluation result is %d\n",
220 GNUNET_h2s (key), (int) eval);
221 ctx->eval = eval;
222
223 switch (eval)
224 {
225 case GNUNET_BLOCK_EVALUATION_OK_MORE:
226 case GNUNET_BLOCK_EVALUATION_OK_LAST:
227 /* forward to local clients */
228 GNUNET_STATISTICS_update (GDS_stats,
229 gettext_noop
230 ("# Good RESULTS found in datacache"), 1,
231 GNUNET_NO);
232 struct GNUNET_PeerIdentity *get_path;
233 get_path = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity) *
234 ctx->get_path_length);
235 struct GetPath *iterator;
236 iterator = ctx->head;
237 int i = 0;
238 while (i < ctx->get_path_length)
239 {
240 get_path[i] = iterator->peer;
241 i++;
242 iterator = iterator->next;
243 }
244 GDS_NEIGHBOURS_send_get_result (key,type, &(ctx->next_hop),&(ctx->source_peer),
245 put_path_length, put_path, ctx->get_path_length,
246 get_path, exp, data, size );
247 GNUNET_free_non_null (get_path);
248
249 break;
250 case GNUNET_BLOCK_EVALUATION_OK_DUPLICATE:
251 GNUNET_STATISTICS_update (GDS_stats,
252 gettext_noop
253 ("# Duplicate RESULTS found in datacache"), 1,
254 GNUNET_NO);
255 break;
256 case GNUNET_BLOCK_EVALUATION_RESULT_INVALID:
257 GNUNET_STATISTICS_update (GDS_stats,
258 gettext_noop
259 ("# Invalid RESULTS found in datacache"), 1,
260 GNUNET_NO);
261 break;
262 case GNUNET_BLOCK_EVALUATION_RESULT_IRRELEVANT:
263 GNUNET_STATISTICS_update (GDS_stats,
264 gettext_noop
265 ("# Irrelevant RESULTS found in datacache"), 1,
266 GNUNET_NO);
267 break;
268 case GNUNET_BLOCK_EVALUATION_REQUEST_VALID:
269 GNUNET_break (0);
270 break;
271 case GNUNET_BLOCK_EVALUATION_REQUEST_INVALID:
272 GNUNET_break_op (0);
273 return GNUNET_SYSERR;
274 case GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED:
275 GNUNET_STATISTICS_update (GDS_stats,
276 gettext_noop
277 ("# Unsupported RESULTS found in datacache"), 1,
278 GNUNET_NO);
279 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
280 _("Unsupported block type (%u) in local response!\n"), type);
281 break;
282 }
283
284 return (eval == GNUNET_BLOCK_EVALUATION_OK_LAST) ? GNUNET_NO : GNUNET_OK;
285}
286
287
288/**
289 * Handle a GET request we've received from another peer.
290 *
291 * @param key the query
292 * @param type requested data type
293 * @param xquery extended query
294 * @param xquery_size number of bytes in xquery
295 * @param reply_bf where the reply bf is (to be) stored, possibly updated, can be NULL
296 * @param reply_bf_mutator mutation value for reply_bf
297 * @return evaluation result for the local replies
298 * @get_path_length Total number of peers in get path
299 * @get_path Peers in get path.
300 */
301enum GNUNET_BLOCK_EvaluationResult
302GDS_DATACACHE_handle_get (const struct GNUNET_HashCode * key,
303 enum GNUNET_BLOCK_Type type, const void *xquery,
304 size_t xquery_size,
305 struct GNUNET_CONTAINER_BloomFilter **reply_bf,
306 uint32_t reply_bf_mutator,
307 uint32_t get_path_length,
308 struct GNUNET_PeerIdentity *get_path,
309 struct GNUNET_PeerIdentity *next_hop,
310 struct GNUNET_PeerIdentity *source_peer)
311{
312 struct GetRequestContext ctx;
313 unsigned int r;
314
315 if (datacache == NULL)
316 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
317 GNUNET_STATISTICS_update (GDS_stats,
318 gettext_noop ("# GET requests given to datacache"),
319 1, GNUNET_NO);
320 ctx.eval = GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
321 ctx.key = *key;
322 ctx.xquery = xquery;
323 ctx.xquery_size = xquery_size;
324 ctx.reply_bf = reply_bf;
325 ctx.reply_bf_mutator = reply_bf_mutator;
326 ctx.get_path_length = get_path_length;
327
328 if (next_hop != NULL)
329 {
330 memcpy (&(ctx.next_hop), next_hop, sizeof (struct GNUNET_PeerIdentity));
331 }
332 unsigned int i = 0;
333
334 ctx.head = NULL;
335 ctx.tail = NULL;
336 if (get_path != NULL)
337 {
338 while (i < get_path_length)
339 {
340 struct GetPath *element;
341 element = GNUNET_new (struct GetPath);
342 element->next = NULL;
343 element->prev = NULL;
344 element->peer = get_path[i];
345 GNUNET_CONTAINER_DLL_insert_tail (ctx.head, ctx.tail, element);
346 i++;
347 }
348 }
349
350 r = GNUNET_DATACACHE_get (datacache, key, type, &datacache_get_iterator,
351 &ctx);
352 DEBUG ("DATACACHE_GET for key %s completed (%d). %u results found.\n",GNUNET_h2s (key), ctx.eval, r);
353 return ctx.eval;
354}
355
356
357/**
358 * Initialize datacache subsystem.
359 */
360void
361GDS_DATACACHE_init ()
362{
363 datacache = GNUNET_DATACACHE_create (GDS_cfg, "dhtcache");
364}
365
366
367/**
368 * Shutdown datacache subsystem.
369 */
370void
371GDS_DATACACHE_done ()
372{
373 if (datacache != NULL)
374 {
375 GNUNET_DATACACHE_destroy (datacache);
376 datacache = NULL;
377 }
378}
379
380
381/* end of gnunet-service-dht_datacache.c */
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-19 08:21:57 +0000