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/*
This file is part of GNUnet.
(C) 2011 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @file fs/gnunet-service-fs_put.c
* @brief API to PUT zero-anonymity index data from our datastore into the DHT
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet-service-fs.h"
#include "gnunet-service-fs_put.h"
/**
* How often do we at most PUT content into the DHT?
*/
#define MAX_DHT_PUT_FREQ GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
/**
* Context for each zero-anonymity iterator.
*/
struct PutOperator
{
/**
* Request to datastore for DHT PUTs (or NULL).
*/
struct GNUNET_DATASTORE_QueueEntry *dht_qe;
/**
* Type we request from the datastore.
*/
enum GNUNET_BLOCK_Type dht_put_type;
/**
* ID of task that collects blocks for DHT PUTs.
*/
GNUNET_SCHEDULER_TaskIdentifier dht_task;
/**
* How many entires with zero anonymity of our type do we currently
* estimate to have in the database?
*/
uint64_t zero_anonymity_count_estimate;
/**
* Current offset when iterating the database.
*/
uint64_t current_offset;
};
/**
* ANY-terminated list of our operators (one per type
* of block that we're putting into the DHT).
*/
static struct PutOperator operators[] = {
{NULL, GNUNET_BLOCK_TYPE_FS_KBLOCK, 0, 0, 0},
{NULL, GNUNET_BLOCK_TYPE_FS_SBLOCK, 0, 0, 0},
{NULL, GNUNET_BLOCK_TYPE_FS_NBLOCK, 0, 0, 0},
{NULL, GNUNET_BLOCK_TYPE_ANY, 0, 0, 0}
};
/**
* Task that is run periodically to obtain blocks for DHT PUTs.
*
* @param cls type of blocks to gather
* @param tc scheduler context (unused)
*/
static void
gather_dht_put_blocks (void *cls,
const struct GNUNET_SCHEDULER_TaskContext *tc);
/**
* Task that is run periodically to obtain blocks for DHT PUTs.
*
* @param cls type of blocks to gather
* @param tc scheduler context (unused)
*/
static void
delay_dht_put_blocks (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
struct PutOperator *po = cls;
struct GNUNET_TIME_Relative delay;
po->dht_task = GNUNET_SCHEDULER_NO_TASK;
if (tc != NULL && 0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
return;
if (po->zero_anonymity_count_estimate > 0)
{
delay =
GNUNET_TIME_relative_divide (GNUNET_DHT_DEFAULT_REPUBLISH_FREQUENCY,
po->zero_anonymity_count_estimate);
delay = GNUNET_TIME_relative_min (delay, MAX_DHT_PUT_FREQ);
}
else
{
/* if we have NO zero-anonymity content yet, wait 5 minutes for some to
* (hopefully) appear */
delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5);
}
po->dht_task =
GNUNET_SCHEDULER_add_delayed (delay, &gather_dht_put_blocks, po);
}
/**
* Store content in DHT.
*
* @param cls closure
* @param key key for the content
* @param size number of bytes in data
* @param data content stored
* @param type type of the content
* @param priority priority of the content
* @param anonymity anonymity-level for the content
* @param expiration expiration time for the content
* @param uid unique identifier for the datum;
* maybe 0 if no unique identifier is available
*/
static void
process_dht_put_content (void *cls, const GNUNET_HashCode * key, size_t size,
const void *data, enum GNUNET_BLOCK_Type type,
uint32_t priority, uint32_t anonymity,
struct GNUNET_TIME_Absolute expiration, uint64_t uid)
{
struct PutOperator *po = cls;
po->dht_qe = NULL;
if (key == NULL)
{
po->zero_anonymity_count_estimate = po->current_offset - 1;
po->current_offset = 0;
po->dht_task = GNUNET_SCHEDULER_add_now (&delay_dht_put_blocks, po);
return;
}
po->zero_anonymity_count_estimate =
GNUNET_MAX (po->current_offset, po->zero_anonymity_count_estimate);
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Retrieved block `%s' of type %u for DHT PUT\n", GNUNET_h2s (key),
type);
GNUNET_DHT_put (GSF_dht, key, 5 /* DEFAULT_PUT_REPLICATION */ ,
GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, type, size, data,
expiration, GNUNET_TIME_UNIT_FOREVER_REL,
&delay_dht_put_blocks, po);
}
/**
* Task that is run periodically to obtain blocks for DHT PUTs.
*
* @param cls type of blocks to gather
* @param tc scheduler context (unused)
*/
static void
gather_dht_put_blocks (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
struct PutOperator *po = cls;
po->dht_task = GNUNET_SCHEDULER_NO_TASK;
if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
return;
po->dht_qe =
GNUNET_DATASTORE_get_zero_anonymity (GSF_dsh, po->current_offset++, 0,
UINT_MAX,
GNUNET_TIME_UNIT_FOREVER_REL,
po->dht_put_type,
&process_dht_put_content, po);
if (NULL == po->dht_qe)
po->dht_task = GNUNET_SCHEDULER_add_now (&delay_dht_put_blocks, po);
}
/**
* Setup the module.
*/
void
GSF_put_init_ ()
{
unsigned int i;
i = 0;
while (operators[i].dht_put_type != GNUNET_BLOCK_TYPE_ANY)
{
operators[i].dht_task =
GNUNET_SCHEDULER_add_now (&gather_dht_put_blocks, &operators[i]);
i++;
}
}
/**
* Shutdown the module.
*/
void
GSF_put_done_ ()
{
struct PutOperator *po;
unsigned int i;
i = 0;
while ((po = &operators[i])->dht_put_type != GNUNET_BLOCK_TYPE_ANY)
{
if (GNUNET_SCHEDULER_NO_TASK != po->dht_task)
{
GNUNET_SCHEDULER_cancel (po->dht_task);
po->dht_task = GNUNET_SCHEDULER_NO_TASK;
}
if (NULL != po->dht_qe)
{
GNUNET_DATASTORE_cancel (po->dht_qe);
po->dht_qe = NULL;
}
i++;
}
}
/* end of gnunet-service-fs_put.c */
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