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-rw-r--r--src/fs/gnunet-service-fs_put.c296
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diff --git a/src/fs/gnunet-service-fs_put.c b/src/fs/gnunet-service-fs_put.c
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1/*
2 This file is part of GNUnet.
3 Copyright (C) 2011 GNUnet e.V.
4
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your 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 Affero General Public License for more details.
14
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
17
18 SPDX-License-Identifier: AGPL3.0-or-later
19 */
20
21/**
22 * @file fs/gnunet-service-fs_put.c
23 * @brief API to PUT zero-anonymity index data from our datastore into the DHT
24 * @author Christian Grothoff
25 */
26#include "platform.h"
27#include "gnunet-service-fs.h"
28#include "gnunet-service-fs_put.h"
29
30
31/**
32 * How often do we at most PUT content into the DHT?
33 */
34#define MAX_DHT_PUT_FREQ GNUNET_TIME_relative_multiply ( \
35 GNUNET_TIME_UNIT_SECONDS, 5)
36
37/**
38 * How many replicas do we try to create per PUT?
39 */
40#define DEFAULT_PUT_REPLICATION 5
41
42
43/**
44 * Context for each zero-anonymity iterator.
45 */
46struct PutOperator
47{
48 /**
49 * Request to datastore for DHT PUTs (or NULL).
50 */
51 struct GNUNET_DATASTORE_QueueEntry *dht_qe;
52
53 /**
54 * Type we request from the datastore.
55 */
56 enum GNUNET_BLOCK_Type dht_put_type;
57
58 /**
59 * Handle to PUT operation.
60 */
61 struct GNUNET_DHT_PutHandle *dht_put;
62
63 /**
64 * ID of task that collects blocks for DHT PUTs.
65 */
66 struct GNUNET_SCHEDULER_Task *dht_task;
67
68 /**
69 * How many entries with zero anonymity of our type do we currently
70 * estimate to have in the database?
71 */
72 uint64_t zero_anonymity_count_estimate;
73
74 /**
75 * Count of results received from the database.
76 */
77 uint64_t result_count;
78
79 /**
80 * Next UID to request when iterating the database.
81 */
82 uint64_t next_uid;
83};
84
85
86/**
87 * ANY-terminated list of our operators (one per type
88 * of block that we're putting into the DHT).
89 */
90static struct PutOperator operators[] = {
91 { NULL, GNUNET_BLOCK_TYPE_FS_UBLOCK, 0, 0, 0 },
92 { NULL, GNUNET_BLOCK_TYPE_ANY, 0, 0, 0 }
93};
94
95
96/**
97 * Task that is run periodically to obtain blocks for DHT PUTs.
98 *
99 * @param cls type of blocks to gather
100 * @param tc scheduler context (unused)
101 */
102static void
103gather_dht_put_blocks (void *cls);
104
105
106/**
107 * Calculate when to run the next PUT operation and schedule it.
108 *
109 * @param po put operator to schedule
110 */
111static void
112schedule_next_put (struct PutOperator *po)
113{
114 struct GNUNET_TIME_Relative delay;
115
116 if (po->zero_anonymity_count_estimate > 0)
117 {
118 delay =
119 GNUNET_TIME_relative_divide (GNUNET_DHT_DEFAULT_REPUBLISH_FREQUENCY,
120 po->zero_anonymity_count_estimate);
121 delay = GNUNET_TIME_relative_min (delay, MAX_DHT_PUT_FREQ);
122 }
123 else
124 {
125 /* if we have NO zero-anonymity content yet, wait 5 minutes for some to
126 * (hopefully) appear */
127 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5);
128 }
129 po->dht_task =
130 GNUNET_SCHEDULER_add_delayed (delay, &gather_dht_put_blocks, po);
131}
132
133
134/**
135 * Continuation called after DHT PUT operation has finished.
136 *
137 * @param cls type of blocks to gather
138 */
139static void
140delay_dht_put_blocks (void *cls)
141{
142 struct PutOperator *po = cls;
143
144 po->dht_put = NULL;
145 schedule_next_put (po);
146}
147
148
149/**
150 * Task that is run periodically to obtain blocks for DHT PUTs.
151 *
152 * @param cls type of blocks to gather
153 */
154static void
155delay_dht_put_task (void *cls)
156{
157 struct PutOperator *po = cls;
158
159 po->dht_task = NULL;
160 schedule_next_put (po);
161}
162
163
164/**
165 * Store content in DHT.
166 *
167 * @param cls closure
168 * @param key key for the content
169 * @param size number of bytes in data
170 * @param data content stored
171 * @param type type of the content
172 * @param priority priority of the content
173 * @param anonymity anonymity-level for the content
174 * @param replication replication-level for the content
175 * @param expiration expiration time for the content
176 * @param uid unique identifier for the datum;
177 * maybe 0 if no unique identifier is available
178 */
179static void
180process_dht_put_content (void *cls,
181 const struct GNUNET_HashCode *key,
182 size_t size,
183 const void *data,
184 enum GNUNET_BLOCK_Type type,
185 uint32_t priority,
186 uint32_t anonymity,
187 uint32_t replication,
188 struct GNUNET_TIME_Absolute expiration,
189 uint64_t uid)
190{
191 struct PutOperator *po = cls;
192
193 po->dht_qe = NULL;
194 if (key == NULL)
195 {
196 po->zero_anonymity_count_estimate = po->result_count;
197 po->result_count = 0;
198 po->next_uid = 0;
199 po->dht_task = GNUNET_SCHEDULER_add_now (&delay_dht_put_task, po);
200 return;
201 }
202 po->result_count++;
203 po->next_uid = uid + 1;
204 po->zero_anonymity_count_estimate =
205 GNUNET_MAX (po->result_count, po->zero_anonymity_count_estimate);
206 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
207 "Retrieved block `%s' of type %u for DHT PUT\n", GNUNET_h2s (key),
208 type);
209 po->dht_put = GNUNET_DHT_put (GSF_dht,
210 key,
211 DEFAULT_PUT_REPLICATION,
212 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
213 type,
214 size,
215 data,
216 expiration,
217 &delay_dht_put_blocks,
218 po);
219}
220
221
222/**
223 * Task that is run periodically to obtain blocks for DHT PUTs.
224 *
225 * @param cls type of blocks to gather
226 */
227static void
228gather_dht_put_blocks (void *cls)
229{
230 struct PutOperator *po = cls;
231
232 po->dht_task = NULL;
233 po->dht_qe =
234 GNUNET_DATASTORE_get_zero_anonymity (GSF_dsh,
235 po->next_uid,
236 0,
237 UINT_MAX,
238 po->dht_put_type,
239 &process_dht_put_content,
240 po);
241 if (NULL == po->dht_qe)
242 po->dht_task = GNUNET_SCHEDULER_add_now (&delay_dht_put_task, po);
243}
244
245
246/**
247 * Setup the module.
248 */
249void
250GSF_put_init_ ()
251{
252 unsigned int i;
253
254 i = 0;
255 while (operators[i].dht_put_type != GNUNET_BLOCK_TYPE_ANY)
256 {
257 operators[i].dht_task =
258 GNUNET_SCHEDULER_add_now (&gather_dht_put_blocks, &operators[i]);
259 i++;
260 }
261}
262
263
264/**
265 * Shutdown the module.
266 */
267void
268GSF_put_done_ ()
269{
270 struct PutOperator *po;
271 unsigned int i;
272
273 i = 0;
274 while ((po = &operators[i])->dht_put_type != GNUNET_BLOCK_TYPE_ANY)
275 {
276 if (NULL != po->dht_task)
277 {
278 GNUNET_SCHEDULER_cancel (po->dht_task);
279 po->dht_task = NULL;
280 }
281 if (NULL != po->dht_put)
282 {
283 GNUNET_DHT_put_cancel (po->dht_put);
284 po->dht_put = NULL;
285 }
286 if (NULL != po->dht_qe)
287 {
288 GNUNET_DATASTORE_cancel (po->dht_qe);
289 po->dht_qe = NULL;
290 }
291 i++;
292 }
293}
294
295
296/* end of gnunet-service-fs_put.c */
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-19 19:13:49 +0000