2 This file is part of GNUnet.
3 (C) 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.
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 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
27 #include "gnunet-service-fs.h"
28 #include "gnunet-service-fs_put.h"
32 * How often do we at most PUT content into the DHT?
34 #define MAX_DHT_PUT_FREQ GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
37 * How many replicas do we try to create per PUT?
39 #define DEFAULT_PUT_REPLICATION 5
43 * Context for each zero-anonymity iterator.
49 * Request to datastore for DHT PUTs (or NULL).
51 struct GNUNET_DATASTORE_QueueEntry *dht_qe;
54 * Type we request from the datastore.
56 enum GNUNET_BLOCK_Type dht_put_type;
59 * Handle to PUT operation.
61 struct GNUNET_DHT_PutHandle *dht_put;
64 * ID of task that collects blocks for DHT PUTs.
66 GNUNET_SCHEDULER_TaskIdentifier dht_task;
69 * How many entires with zero anonymity of our type do we currently
70 * estimate to have in the database?
72 uint64_t zero_anonymity_count_estimate;
75 * Current offset when iterating the database.
77 uint64_t current_offset;
82 * ANY-terminated list of our operators (one per type
83 * of block that we're putting into the DHT).
85 static struct PutOperator operators[] = {
86 {NULL, GNUNET_BLOCK_TYPE_FS_UBLOCK, 0, 0, 0},
87 {NULL, GNUNET_BLOCK_TYPE_ANY, 0, 0, 0}
92 * Task that is run periodically to obtain blocks for DHT PUTs.
94 * @param cls type of blocks to gather
95 * @param tc scheduler context (unused)
98 gather_dht_put_blocks (void *cls,
99 const struct GNUNET_SCHEDULER_TaskContext *tc);
103 * Calculate when to run the next PUT operation and schedule it.
105 * @param po put operator to schedule
108 schedule_next_put (struct PutOperator *po)
110 struct GNUNET_TIME_Relative delay;
112 if (po->zero_anonymity_count_estimate > 0)
115 GNUNET_TIME_relative_divide (GNUNET_DHT_DEFAULT_REPUBLISH_FREQUENCY,
116 po->zero_anonymity_count_estimate);
117 delay = GNUNET_TIME_relative_min (delay, MAX_DHT_PUT_FREQ);
121 /* if we have NO zero-anonymity content yet, wait 5 minutes for some to
122 * (hopefully) appear */
123 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5);
126 GNUNET_SCHEDULER_add_delayed (delay, &gather_dht_put_blocks, po);
131 * Continuation called after DHT PUT operation has finished.
133 * @param cls type of blocks to gather
134 * @param success GNUNET_OK if the PUT was transmitted,
135 * GNUNET_NO on timeout,
136 * GNUNET_SYSERR on disconnect from service
137 * after the PUT message was transmitted
138 * (so we don't know if it was received or not)
141 delay_dht_put_blocks (void *cls, int success)
143 struct PutOperator *po = cls;
146 schedule_next_put (po);
151 * Task that is run periodically to obtain blocks for DHT PUTs.
153 * @param cls type of blocks to gather
154 * @param tc scheduler context
157 delay_dht_put_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
159 struct PutOperator *po = cls;
161 po->dht_task = GNUNET_SCHEDULER_NO_TASK;
162 schedule_next_put (po);
167 * Store content in DHT.
170 * @param key key for the content
171 * @param size number of bytes in data
172 * @param data content stored
173 * @param type type of the content
174 * @param priority priority of the content
175 * @param anonymity anonymity-level for the content
176 * @param expiration expiration time for the content
177 * @param uid unique identifier for the datum;
178 * maybe 0 if no unique identifier is available
181 process_dht_put_content (void *cls,
182 const struct GNUNET_HashCode * key,
185 enum GNUNET_BLOCK_Type type,
186 uint32_t priority, uint32_t anonymity,
187 struct GNUNET_TIME_Absolute expiration, uint64_t uid)
189 struct PutOperator *po = cls;
194 po->zero_anonymity_count_estimate = po->current_offset - 1;
195 po->current_offset = 0;
196 po->dht_task = GNUNET_SCHEDULER_add_now (&delay_dht_put_task, po);
199 po->zero_anonymity_count_estimate =
200 GNUNET_MAX (po->current_offset, po->zero_anonymity_count_estimate);
201 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
202 "Retrieved block `%s' of type %u for DHT PUT\n", GNUNET_h2s (key),
204 po->dht_put = GNUNET_DHT_put (GSF_dht, key, DEFAULT_PUT_REPLICATION,
205 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, type, size, data,
206 expiration, GNUNET_TIME_UNIT_FOREVER_REL,
207 &delay_dht_put_blocks, po);
212 * Task that is run periodically to obtain blocks for DHT PUTs.
214 * @param cls type of blocks to gather
215 * @param tc scheduler context (unused)
218 gather_dht_put_blocks (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
220 struct PutOperator *po = cls;
222 po->dht_task = GNUNET_SCHEDULER_NO_TASK;
223 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
226 GNUNET_DATASTORE_get_zero_anonymity (GSF_dsh, po->current_offset++, 0,
228 GNUNET_TIME_UNIT_FOREVER_REL,
230 &process_dht_put_content, po);
231 if (NULL == po->dht_qe)
232 po->dht_task = GNUNET_SCHEDULER_add_now (&delay_dht_put_task, po);
245 while (operators[i].dht_put_type != GNUNET_BLOCK_TYPE_ANY)
247 operators[i].dht_task =
248 GNUNET_SCHEDULER_add_now (&gather_dht_put_blocks, &operators[i]);
255 * Shutdown the module.
260 struct PutOperator *po;
264 while ((po = &operators[i])->dht_put_type != GNUNET_BLOCK_TYPE_ANY)
266 if (GNUNET_SCHEDULER_NO_TASK != po->dht_task)
268 GNUNET_SCHEDULER_cancel (po->dht_task);
269 po->dht_task = GNUNET_SCHEDULER_NO_TASK;
271 if (NULL != po->dht_put)
273 GNUNET_DHT_put_cancel (po->dht_put);
276 if (NULL != po->dht_qe)
278 GNUNET_DATASTORE_cancel (po->dht_qe);
285 /* end of gnunet-service-fs_put.c */